VD4/R - ABBEN)-_1VCP000037.pdf · 5 1 Versions available VD4/R circuit-breakers are available in...

VD4/RMV vacuum circuit-breakers for secondary distribution

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DESCRIPTION

CIRCUIT-BREAKER SELECTION AND ORDERING

SPECIFIC PRODUCT CHARACTERISTICS

OVERALL DIMENSIONS

ELECTRIC CIRCUIT DIAGRAM

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General information 4

Versions available 5

Fields of application 5

Protection relay 5

Standards and approvals 6

Service safety 6

Accessories 6

ESH operating mechanism 6

Technical documentation 8

Electrical characteristics 8

Quality Assurance System 8

Environmental Management System 8

Test laboratory 8

DESCRIPTION

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DESCRIPTION

Fully interchangeable with gas-insulated HD4/R circuit-breakers

Mechanical operating mechanism with stored energy able to carry out a completecycle O-C-O without spring recharging

ESH type operating mechanism common to all the HD4, HD4/R and VD4/R series

High number of operations and long electrical and mechanical life

Suitable for installation in prefabricated substations and switchboards

Simple personalisation thanks to the complete range of accessories

Vacuum interrupters incorporated in the pole cylinders to ensure resistance to im-pact, condensation and polluted environments

Maintenance-free

Application (on request) of the current sensors and protection device self-suppliedPR521 (suitable for installation in unmanned plants)

General informationThe VD4/R series of medium voltage vacuum cir-cuit-breakers for indoor installation are constructedusing the separate pole technique.Each pole has a vacuum interrupter inside it which,thanks to a special production process, is incorpo-rated in the resin directly during the cylindermoulding stage.This construction technique ensure protection ofthe vacuum interrupter against impact, dust andcondensation phenomena.The operating mechanism is the ESH type withstored energy and free release, with opening andclosing operations independent of the operator.The ESH operating mechanism is already widelyused in all the HD4 series circuit-breakers withfront operating mechanism and HD4/R with lateraloperating mechanism.Remote control of the circuit-breaker is possible bymeans of applying special electrical accessories(geared motor, shunt opening release, etc.).The operating mechanism, the three poles and thecurrent sensors (if provided) are mounted on a me-tallic frame without wheels. Construction is particu-larly compact, sturdy and of limited weight.The circuit-breakers in the VD4/R series are“sealed for life” pressure systems (IEC 62271-100and CEI 71-1 Standards).

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Versions availableVD4/R circuit-breakers are available in the fixedversion with right lateral operating mechanism.On request they can be fitted with current sensorsand PR521 microprocessor-based protection de-vice.Specific versions are available for UniAir, UniMixand UniSwitch switchboards.In the 24 kV versions with 230 mm pole centredistance, only two current sensors can bemounted (on the lateral poles).

Fields of applicationThe VD4/R series circuit-breakers are used in allapplications for medium voltage secondary distri-bution and in MV/LV transformer substations in fac-tories, workshops in the industrial sector in gen-eral, and in the service sector.Thanks to application (on request) of the PR521self-supplied microprocessor-based overcurrentrelease, HD4/R circuit-breakers are suitable foruse in unmanned MV/LV transformer substationsand without auxiliary power supply.

Other important characteristics of the PR521 de-vices are:– trip precision– wide setting range– operation guaranteed even with single-phase

power supply– constancy of characteristics and operating reli-

ability even in highly polluted ambients– single and simultaneous adjustment of all three

phases– no limit to the rated breaking capacity (thanks to

the current sensors) and to the short-time with-stand current of the circuit-breaker.

For further information, please consult chapter 3.

Protection deviceOn request, the circuit-breakers in the VD4/R se-ries with rated voltage up to 24 kV can be fittedwith self-supplied PR521 type microprocessor-based overcurrent protection device, available inthe following types:– PR521 (50-51): provides the protection function

against overload (51) and against instantaneousand delayed short-circuit (50);

– PR521 (50-51-51N): provides the protectionfunction against overload (51), againstinstantaneous and delayed short-circuit (50) andagainst earth fault (51N).

The current sensors are available in four rated cur-rent values and cover all the circuit-breaker fieldsof application (for the protection fields, please seechap. 3).

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DESCRIPTION

Standards and approvalsThe VD4/R circuit-breakers comply with the IEC62271, CEI 17-1 file 1375, and CENELEC HD 348S6 Standards, as well as those of the major indus-trialised countries. They have undergone the testsindicated below and ensure service safety and reli-ability of the apparatus in all installations.• Type tests: heating, withstand insulation at

industrial frequency and atmospheric impulse,short-time and peak withstand current, me-chanical life, making and breaking capacity ofshort-circuit currents.

• Individual tests: insulation with voltage atindustrial frequency in the main circuits, insula-tion of the auxiliary and control circuits, meas-urement of the main circuit resistance andmechanical and electrical operation.

Service SafetyThanks to the complete range of mechanical andelectrical locks (on request), safe distributionswitchboards can be constructed with the VD4/Rcircuit-breakers.The locking devices have been studied to preventincorrect operations and carry out inspection of theinstallations whilst guaranteeing maximum opera-tor safety.All the operating, control and signalling devices arelocated on the front of the circuit-breaker.The anti-pumping device is always provided on theactuator.

AccessoriesThe VD4/R circuit-breakers have a complete rangeof accessories which means all installation require-ments can be satisfied.The operating mechanism is of the same type forthe whole series and has a standardised range ofaccessories and spare parts which are easy toidentify and order. Use and service of the appara-tus are simple and require limited use of re-sources.

ESH operating mechanism• Single operating mechanism for the whole

series.• The same accessories for all the types of circuit-

breaker.• Fixed reference points to simplify assembly and

replacement of the accessories.• Accessory cabling with socket and plug.• Suitable for the rapid 0-0,3s-CO–15s-CO

reclosing cycle

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Electrical accessories withsimplified assembly.

Circuit-breaker character-istics nameplate on thefront panel.

Self-supplied PR521 relay(on request) and coordina-tion with the circuit-breakerand with the current sensors.

Current sensors (onrequest), easily replaced.

Mechanical anti-pumpingdevice.

1 PR521 protection device (on request)

2 Closing pushbutton

3 Opening pushbutton

4 Signalling device for circuit-breakeropen/closed

5 Shaft for manual closing spring charg-ing

6 Signalling device for closing springscharged (yellow) and discharged (white)

7 Medium voltage terminals

8 Circuit-breaker pole

9 Current sensor (for PR521 device - ifprovided)

10 Operation counter

11 Key lock seat (if provided).

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1DESCRIPTION

Technical documentationTo go into technical and application aspects of the VD4/R circuit-breakers in depth, ask for the following publications:

– UniAir switchboards Cat. 649223

– UniMix switchboards Cat. 649429

– UniSwitch switchboards Cat. UNIS11

– REF 542 Plus unit Cat. 649423

– PR512 protection device Cat. 649092.

Quality Assurance SystemCertified by an external independent organization as complyingwith ISO 9001 Standards.

Environmental Management SystemCertified by an external independent organization as complyingwith ISO 14001 Standards.

Test laboratoryAccredited by an external independent organization as complyingwith UNI CEI EN ISO/IEC 17025 Standards.

Electrical characteristics

Rated voltage [kV]

VD4/R 12 VD4/R 17 VD4/R 24

12 17.5 24

630/800/1250 630/800/1250 630/800/1250

12.5 ... 25 12.5 ... 20 12.5 ... 20

Circuit-breaker

Rated normal current [A]

Rated breaking capacity [kA]

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General characteristics of fixed circuit-breakerswith right lateral operating mechanism 10

Standard fittings 12

Fixed circuit-breakers with right lateral operating mechanism 12

Accessories to be personalised at the time of ordering 13

Optional accessories 14


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General characteristics of fixed circuit-breakerswith right lateral operating mechanism

(1) In the 24 kV versions with 230 mm pole centre dis-tance, only two current sensors can be mounted on thelateral poles.

(2) Rated current of the current sensors.(3) For circuit-breakers with PR521 device and current

sensors, increase the weight indicated by 20 kg.

P = 230 mm

P = 300 mm

IEC 62271-100

CEI 17-6

CENELEC HD 348 S6

Ur [kV]

Us [kV]

Ud (1 min) [kV]

Up [kV]

fr [Hz]

Ir [A]

Isc [kA]

Ik [kA]

Ip [kA]

[O-3min-CO-3min-CO]

[O-0,3s-CO-3min-CO]

[ms]

[ms]

[ms]

[ms]

PR521

(2) In [A]

H [mm]

W [mm]

D [mm]

[Kg]

[°C]

IEC: 60068-2-30, 721-2-1

IEC: 60694, 61000-6-2, 61000-6-4

Circuit-breaker

Pole centre distance

Standards

Rated voltage

Rated insulation voltage

Withstand voltage at 50 Hz

Impulse withstand voltage

Rated frequency

Rated normal current (40 °C)

Rated breaking capacity

Rated short-time

withstand current (3 s)

Making capacity

Operation sequence

Opening time

Arcing time

Total breaking time

Closing time

Application of protection device

with current sensors (1)

Maximum overall dimensions

Weight (3)

Operating temperature

Tropicalization

Electromagnetic compatibility

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VD4/R 24

24

24

50

125

50-60

630 800 1250

12.5 – –

16 16 16

20 20 20

– – –

12.5 – –

16 16 16

20 20 20

– – –

31.5 – –

40 40 40

50 50 50

– – –

45

10-15

55-60

80

40 80 250 1250

770

282

1049 (P=230 mm) / 1189 (P=300 mm)

103

– 5 °C ... + 40 °C

VD4/R 12

12

12

28

75

50-60

630 800 1250

12.5 – –

16 16 16

20 20 20

25 25 25

12.5 – –

16 16 16

20 20 20

25 25 25

31.5 – –

40 40 40

50 50 50

63 63 63

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10-15

55-60

80

40 80 250 1250

770

282

1049 (P=230 mm) / 1189 (P=300 mm)

103

– 5 °C ... + 40 °C

VD4/R 17

17.5

17.5

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95

50-60

630 800 1250

12.5 – –

16 16 16

20 20 20

– – –

12.5 – –

16 16 16

20 20 20

– – –

31.5 – –

40 40 40

50 50 50

– – –

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10-15

55-60

80

40 80 250 1250

770

282

1049 (P=230 mm) / 1189 (P=300 mm)

103

– 5 °C ... + 40 °C

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VD4/R 12 - 17 - 24

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Kit BCAUTION : The circuit-breaker selected must becompleted with the ac-cessories specified in thestandard fittings (see Kits1 , 2, 3 on page 13). Theoptional accessories areindicated on page 14.

Pole centre distanceP 230 mm P 300 mm

U [kV] In [A] Isc [kA] Description Availability Availability12 630 12.5 VD4/R 12.06.12

16 VD4/R 12.06.1620 VD4/R 12.06.2025 VD4/R 12.06.25

800 16 VD4/R 12.08.1620 VD4/R 12.08.2025 VD4/R 12.08.25

1250 16 VD4/R 12.12.1620 VD4/R 12.12.2025 VD4/R 12.12.25

17,5 630 12.5 VD4/R 17.06.1216 VD4/R 17.06.1620 VD4/R 17.06.20

800 16 VD4/R 17.08.1620 VD4/R 17.08.20

1250 16 VD4/R 17.12.1620 VD4/R 17.12.20

24 630 12.5 VD4/R 24.06.1216 VD4/R 24.06.1620 VD4/R 24.06.20

800 16 VD4/R 24.08.1620 VD4/R 24.08.20

1250 16 VD4/R 24.12.1620 VD4/R 24.12.20

Standard fittingsThe basic coded version of the fixed circuit-breakers is alwaysthree-pole with right lateral operating mechanism and is fitted with:1 closing pushbutton2 opening pushbutton3 operation counter4 mechanical signalling device for circuit-breaker open/closed5 manual spring charging handle coupling6 mechanical signalling device for closing springs charged/

discharged.It is also fitted with a terminal box, basic cabling, spring charg-ing handle and the following accessories to be specified at thetime of ordering (see Kits 1, 2, 3 shown on page 13 ):Kit 1 set of five open/closed auxiliary contacts or, alternatively

and on payment, fifteen auxiliary contacts. The shuntopening release uses one of the five standard auxiliarycontacts to de-energise itself with the circuit-breaker open

Kit 2 shunt opening releaseKit 3 key lock.

Fixed circuit-breakers with right lateral operating mechanism

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Kit Description1A Set of 5 contacts cabled to terminal box

1B Set of 15 contacts. Ten contacts cabled toterminal box and five to be cabled directly tothe terminals of the contacts themselves

Open/closed signalling contactsSet of five or fifteen auxiliary contacts (on requestand with extra cost) as an alternative to the set offive contacts provided as standard.

Electrical characteristics of the contactsUn Icu cos j T500 V~ 15 A 0,4 –

220 V– 1,5 A – 10 ms

Instantaneous shunt opening release (-MO1)The shunt opening release is suitable for instanta-neous service; it automatically de-energises withthe circuit-breaker open by means of an auxiliarycontact.

Electrical characteristicsInrush power 125 VA/W

Voltages available

Key lock in open positionSpecify the type of lock required:3A Lock with different keys3B Lock with the same keys

Kit Un2A 24 V–2B 30 V–2C 48 V–2D 60 V–2E 110 V–2F 125 V–2G 220 V–2H 250 V–

Kit Un F2I 48 V~ 50 Hz2J 110 V~ 50 Hz2K 120 (127) V~ 50 Hz2L 230 (220/240) V~ 50 Hz

Kit Un F2M 110 (127) V~ 60 Hz2N 230 (220/240) V~ 60 Hz

Accessories to be specified at the time of ordering

Kit 1

Kit 2

Kit 3

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Optional accessories

Standard fittings– Manual operating mechanism– Closing springs charged/discharged

mechanical signalling device– Circuit-breaker open/closed mechani-

cal signalling device– Operation counter– Closing pushbutton– Opening pushbutton– Terminal box– Basic cabling– Shunt opening release– Five open/closed auxiliary contacts

or, alternatively and with extra cost,ten auxiliary contacts

– Key lock– Spring charging handle.

(1) Not compatible with PR521 protection device and withYO3 opening solenoid.

Spring charging motor (-MM)

Shunt closing release (-MC)

Undervoltagerelease (-MU)

Closing springs charged/dis-charged signalling contact (-B33M)

Opening pushbutton lock

Closing pushbutton lock

Protection device

Accessories to make thecircuit-breaker removable

Connection terminals

Additional shunt openingrelease (-MO2) ( 1)

KIT4 ... 5

KIT6

KIT8 ... 11

KIT12

KIT13

KIT14

KIT15 ... 19

KIT20 ... 22

KIT23

KIT7

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Release lever

Socket and plug connector(cabling by customer)

Set of wheels

Current sensors(in the 24 kV versions with 230 mm polecentre distance, only two current sensors

can be mounted on the lateral poles)

Opening solenoid (-MO3)

PR521 protection device

Geared motor protectioncircuit-breaker (F60)

with signalling contact

Spring charging gearedmotor (-MM)

Undervoltagerelease (-MV)

Electronic time delay device(this accessory must be mounted

outside the circuit-breaker)

Mechanical overrideof the release

Electrical signalling forundervoltage trip

External toroidal transformer for51N low threshold protection

TT2 test unit

Accessory By customer By ABB

KIT4

KIT5

KIT8

KIT9

KIT10

KIT11

KIT18

KIT19

KIT15

KIT16

KIT17

KIT20

KIT21

KIT22

Kit 4Kit 5Kit 6Kit 7Kit 8Kit 9Kit 10Kit 11Kit 12Kit 13Kit 14Kit 15Kit 16Kit 17Kit 18Kit 19Kit 20Kit 21Kit 22Kit 23

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Shunt closing release (-MC)This is an electromechanical device which, follow-ing energisation of an electromagnet, activates theoperating mechanism release lever making thecircuit-breaker close. The circuit-breaker operatingmechanism is provided with an anti-pumpingdevice as standard.


Inrush power (x 150 ms) 250 VA / W

Continuous power: 5 VA / W

Spring charging geared motor (-MM)

This automatically charges the operating mecha-nism springs after the closing operation.The 24 V d.c. geared motor is always supplied withthe thermomagnetic protection circuit-breaker (Kit 5).



Continuous power 400 VA / W

Charging time from 7 to 10 s

Geared motor thermomagnetic protectioncircuit-breaker (-F60)This protects the spring charging motor in the caseof an overload. It is always provided with a signal-ling contact.It is available in two versions:5A Protection circuit-breaker with signalling

contact for circuit-breaker closed5B Protection circuit-breaker with signalling

contact for circuit-breaker open.

Voltages availableKit Un F5A 24/60 V– –

5A 110/127 V~/V– 50-60 Hz

5A 220/240 V~/V– 50-60 Hz

Kit Un F5B 24/60 V– –

5B 110/127 V~/V– 50-60 Hz

5B 220/240 V~/V– 50-60 Hz

Electrical characteristics of the contactUn In cos j T110 V~ 4 A 0.3 –

220 V~ 3 A 0.3 –

110 V– 0.25 A – 10 ms

220 V– 0.13 A – 10 ms

Kit 4

Kit 5

Kit 6

Voltages available

Kit Un4A 24 V–4B 30 V–4C 48 V–4D 60 V–4E 110 V–4F 125 V–4G 220 V–4G 250 V–


Kit Un F4M 110 (127) V~ 60 Hz4N 230 (220/240) V~ 60 Hz

Voltages available



Kit Un F6M 110 (127) V~ 60 Hz6N 230 (220/240) V~ 60 Hz

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Additional shunt opening release (-MO2)This is an electromechanical device which, follow-ing energisation of an electromagnet, activates theoperating mechanism release lever making the cir-cuit-breaker open.The additional shunt opening release is not com-patible with the PR521 protection device or withthe opening solenoid MO3.This application uses one of the auxiliary contactsto cut off its power supply with the circuit-breakeropen.


Inrush power 125 VA / W

Kit 7Voltages available



Kit Un F7M 110 (127) V~ 60 Hz7N 230 (220/240) V~ 60 Hz

Undervoltage release (-MU)This makes the circuit-breaker open when therelative power supply voltage drops or is cut off. Itis only available in the version for power supplybranched on the supply side of the circuit-breaker.



Continuous power 5 VA / W

Voltages available



Kit Un F8M 110 (127) V~ 60 Hz8N 230 (220/240) V~ 60 Hz

N.B. The undervoltage release can be combined with the electronic time delay device (see Kit no. 9), can be fittedwith electrical signalling for release energised or release de-energised (see Kit No. 10) and can be fitted withmechanical override (see Kit No. 11).

Voltages availableKit Un F9A 24/30 V – –

9B 48 V – / ~ 50-60 Hz

9C 60 V – / ~ 50-60 Hz

9D 110/127 V – / ~ 50-60 Hz

9E 220/240 V – / ~ 50-60 Hz

Electronic time delay device for undervolt-age release with power supply branchedon the supply side of the circuit breakerThis allows circuit-breaker opening to be delayed(from 0.5 s to 3 s) when the power supply voltagedrops or is cut off.It consists of a device (to be mounted outside thecircuit-breaker by the customer) which is inter-posed on the undervoltage release power supply.

– 0.5 s bridge between terminals 6 and 7;– 1 s bridge between terminals 6 and 8;– 1.5 s bridge between terminals 6 and 9;– 2 s bridge between terminals 6 and 10;– 3 s no bridge.

N.B. The electronic time delay device must be suppliedbetween terminals 1 and 2. The undervoltage releasemust be connected to terminals 3 and 4. The delay is se-lected (by the customer) as follows:

Kit 8

Kit 9

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Mechanical override for undervoltagereleaseThis overrides the mechanical action of theundervoltage release (5) allowing closure of thecircuit-breaker with the undervoltage release de-energised.It is always fitted with electrical signallingof release excluded.

Signalling contact for closing springscharged or discharged (-B33M/1-2)Inserted in an electric circuit, this signals the stateof the operating mechanism closing springs.It is available in two alternative versions:12A Contact signalling springs charged12B Contact signalling springs discharged.

Kit 10

Kit 11

Kit 12

Electrical characteristics of the contact

Un In cos j T

110 V~ 4 A 0,3 –

220 V~ 3 A 0,3 –

380 V~ 1,5 A 0,3 –

110 V– 0,25 A – 10 ms

220 V– 0,13 A – 10 ms

Signalling contact for undervoltage releaseenergised or de-energisedInserted in an electric circuit, this indicates thestate of the undervoltage release.It is available in two alternative versions:10A Signalling undervoltage release energised10B Signalling undervoltage release de-ener-

gised.

Locks on operating pushbuttonsThese allow the circuit-breaker operating mecha-nism knobs to be locked.They are available in the following versions:13A Opening pushbutton without padlock13B Opening pushbutton with padlock14A Closing pushbutton without padlock14B Closing pushbutton with padlock.

N.B. For locks 13A and 14A, the padlocks must be provided by the customer (hook diameter = 4 mm).

Electrical characteristics of the contact

Un In cos j T

110 V~ 4 A 0,3 –

220 V~ 3 A 0,3 –

380 V~ 1,5 A 0,3 –

110 V– 0,25 A – 10 ms

220 V– 0,13 A – 10 ms

Kit 10

Kit 11

Kit 12

Kit 13 - Kit 14

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PR521 microprocessor-based protectiondevice (-B51)This controls circuit-breaker tripping due to:– overload (51)– short-circuit (50)– earth fault (51N).It is available in two alternative versions:15A PR 521 with protection 51-5015B PR 521 with protection 51-50-51N

For the technical and trip characteristics and forthe minimum adjustable threshold values of func-tion 51N, with three sensors or with an externaltoroidal transformer, please see chapter 3.

Notes– The transparent anti-tampering protection is always

supplied with the PR521 protection device.– For operation of the relay, the circuit-breaker must be

fitted with the opening solenoid - MO3 (Kit No. 16) and with two or three current sen-

sors -BL/L1 ... L3 (Kit No. 17).Three current sensors are necessary to carry outfunction 51N for vectorial summation of the phasecurrents. Should function 51N be carried out with anexternal toroidal current transformer, only two currentsensors can be installed.In the 24 kV versions with 230 mm pole centre dis-tance, only two current sensors can be mounted(on the lateral poles).

Opening solenoid (-MO3)This makes the circuit-breaker open if the PR521overcurrent release installed on the circuit-breaker,or the PR512 installed in a switchboard trips.

N.B. The opening solenoid can only be used combinedwith an ABB PR521 and PR512 series device.

Current sensors for PR521 overcurrentrelay (-BI/L1 ... L3)The current sensors transmit the current signal tobe processed to the relay and supply the power tosupply the relay and the opening solenoid in thecase of tripping.The kit includes all the accessories for mountingthe sensors except the connection cabling to therelay.N.B. In the 24 kV versions with 230 mm pole centredistance, only two current sensors can be mountedon the lateral poles.

Types availableKit In17A No. 2 sensors In = 40 A

17B No. 3 sensors In = 40 A

17C No. 2 sensors In = 80 A

17D No. 3 sensors In = 80 A

17E No. 2 sensors In = 250 A

17F No. 3 sensors In = 250 A

17G No. 2 sensors In = 1250 A

17H No. 3 sensors In = 1250 A

Kit 15

Kit 16

Kit 17

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2CIRCUIT-BREAKER SELECTION AND ORDERING

External toroidal transformer (-BI/O)The external toroidal transformer allows the earthfault current to be detected.

Kit 18It is available in the following versions: (withtransformation ratio In = 50/1 A):18A Closed core with 110 mm internal diameter18B Openable core with 110 mm internal diam-

eter.

TT2 test unitThis portable device allows circuit-breaker openingto check operation of the PR521 “release chain”and the opening solenoid (-MO3).

Connection terminalsThe terminals allow connection to the power cir-cuit of the fixed circuit-breaker. The set includesthe set of three top and bottom terminals availablein the following versions:

22 Release leverThe kit consists of the lever which allows thecircuit-breaker to be hooked up with andlocked into the unit.N.B. The release lever only prevents translation ofthe circuit-breaker. Its activation does not automati-cally cause opening of the circuit-breaker.

23A Set of 630 A terminals23B Set of 1250 A terminals.

It also allows the bistable alarm signalling device ofthe PR521 to be reset.

Accessories for making the fixed circuit-breaker removableThe accessories can be ordered separately.20 Set of wheels

The kit consists of the set of front and rearwheels in replacement of the fixing bracketsfor mounting the fixed circuit-breaker.N.B. Assembly is to be carried out by the cus-tomer.

21 Socket and plugThe kit consists of a 58-pole connector, male(mobile plug) and female (fixed socket) andthe pins needed for cabling.N.B. The cables, sheath and assembly are to becarried out by the customer.

Kit 19

Kit 20 - Kit 21 - Kit 22

Kit 23

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Resistance to vibrations 22

Electromagnetic compatibility 22

Tropicalization 22

Altitude 22

Environmental protection programme 23

Anti-pumping device 23

Spare parts 23

PR521 protection device 24


22

Ka = e m (H – 1000)/8150

(IEC 71-2)


Resistance to vibrationsThe VD4/R circuit-breakers are unaffected by me-chanical vibrations or those due to electromagneticeffect.

Electromagnetic compatibilityThe VD4/R circuit-breakers fitted with PR521 elec-tronic microprocessor-based protection device en-sure operation free of unwarranted trips, even inthe presence of interference caused by electronicapparatus, by atmospheric disturbances or by elec-trical discharges.Furthermore, the apparatus does not generate in-terference with other electronic equipment in thevicinity of the installation. The above is in compli-ance with the EN 50081-2, 50082-2 and 60694Standards, as well as with the European EEC 89/336 and subsequent Directives regarding electro-magnetic compatibility (EMC), and the releasesare EC marked as complying with these.

TropicalizationThe VD4/R circuit-breakers are manufactured incompliance with the strictest regulations for use inhot-humid-saline climates.All the most important metal components aretreated against corrosive factors according to UNI3564-65 Standards environmental class C.Galvanisation is carried out in accordance with UNIISO 2081 Standards, classification code Fe/ Zn 12,with a thickness of 12x10 -6 m, protected by a con-version layer mainly consisting of chromates incompliance with the UNI ISO 4520 Standards.These construction characteristics mean theVD4/ R series of circuit-breakers comply withclimate graph 8 of the IEC 60721-2-1 Standards.

AltitudeIt is a known fact that the insulating property of airdecreases as the altitude increases.This phenomenon must therefore always be takeninto account during the design stage of the insulat-ing components of apparatus to be installed over1000 m above sea level. In this case a correctioncoefficient must be considered, which can be takenfrom the graph to the side, built up on the basis ofthe indications in the IEC 62271-100 Standards.The following example is a clear interpretation ofthe indications given above.

Example• Installation altitude: 2000 m• Rated service voltage of 12 kV• Industrial frequency withstand voltage: 28 kV

rms• Impulse withstand voltage: 75 kVp• Ka factor, which can be taken from the graph =

1.13.

Considering the above parameters, the apparatusmust withstand (on test at zero altitude, i.e. at sealevel):– industrial frequency withstand voltage:

28 x 1,13 = 31,6 kVrms

– impulse withstand voltage:75 x 1,13 = 84,7 kVp.

From the above, it can be deduced that for installa-tions at an altitude of 2000 m above sea level, with12 kV service voltage, apparatus must be providedwith 17.5 kV rated voltage, characterised by insula-tion levels at industrial frequency of 38 kVrms with95 kVp impulse withstand voltage.

Graph for determining the Ka correctionfactor according to the altitude

H = altitude in metres;m = value referred to industrial frequency and to the

atmospheric impulse and between phasewithstand voltages.

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The anti-pumping device avoids this situation, en-suring that each closing operation is only followedby a single opening operation and that there is noclosing operation after this. To obtain a further clos-ing operation, the closing input must be releasedand then relaunched.Furthermore, the anti-pumping device only allowscircuit-breaker closure if the following conditionsare present at the same time:– operating mechanism springs fully charged– opening pushbutton and/or shunt opening re-

lease (-MO1) not enabled– main circuit-breaker contacts open and at their

run end.

Spare parts– Opening springs (*)– Closing springs (*)– Complete pole (*)– Basic operating mechanism (*)– Geared motor– Shunt opening release– Additional shunt opening release– Shunt closing release– Key lock– Geared motor limit contact– Opening pushbutton– Closing pushbutton

Ordering: for availability and ordering of spareparts, please contact our Service, specifying thecircuit-breaker serial number.

Environmental protection programmeThe VD4/R circuit-breakers are manufactured inaccordance with the ISO 14000 Standards (Guide-lines for environmental management).The production processes are carried out in com-pliance with the Standards for environmental pro-tection in terms of reduction in energy consump-tion as well as in raw materials and production ofwaste materials.Assessment of the environmental impact of the lifecycle of the product (LCA - Life Cycle Assess-ment),obtained by minimising energy consumption andoverall raw materials of the product, became aconcrete matter during the design stage by meansof targeted selection of the materials, processesand packing.Production techniques which prepare the productsfor simple dismantling and separation of the com-ponents are used during manufacture of the circuit-breakers. This is to allow maximum recycling at theend of the useful life cycle of the apparatus.The Environmental Management System of themedium voltage apparatus production facility iscertified by an external independent organisation.

Anti-pumping deviceThe ESH operating mechanism on VD4/R circuit-breakers (in all versions) is fitted with a mechanicalanti-pumping device which prevents re-closing dueto either electrical or mechanical input.Should both the closing input and any one of theopening input be active at the same time, therewould be a continuous succession of opening andclosing operations.

(*) Replacement can onlybe carried out bytrained personnel and/or in our workshops.

24


PR521 protection deviceThe PR521 unit carries out the following functions:• PR521 - LSI: overcurrent protection (code ANSI

50-51), two-phase or three-phase according tothe whether it is connected to two or threecurrent sensors;

• PR521 - LSIG: like PR521-LSI plus earth faultprotection (code ANSI 51N) (by means ofvectorial summation inside the three phase sen-sors or by means of an external earth fault toroidand two or three current sensors).

Apart from supplying the current signal, the currentsensors also provide the energy required for op-eration of the unit.

PR521 with LSI protection functions. PR521 with LSIG protection functions.

The unit is self-supplied and its correct operation isguaranteed in the presence of a current higherthan or equal to 20% of the rated value on at leastone of the phases fitted with current sensors (0.2 xIn).Microprocessor-based digital technology is used inits construction.The unit causes the circuit-breaker, in which it isintegrated, to open, by means of an opening sole-noid (-MO3 - see accessory kit no. 13), whichacts directly on the operating mechanism of theapparatus.

25

PR521

3

Current sensors (C.S.)The PR521 unit can be used with current sensorssupplied by ABB with the following characteristics:

Rated primary current In = 40 A

In = 80 A

In = 250 A

In = 1250 A

Rated secondary current In = 1 A.

To select the sensor, enable the corresponding dip-switch. If, by chance, several sensors are selected,the alarm LED flashes to provide an error signal.The current sensors can be mounted on board theVD4/R circuit-breakers with rated voltage up to 24kV. The 24 kV circuit-breakers with 230 mm polecentre distance can only mount two current sen-sors on board.

External earth fault toroidThe PR521 unit can be used with any externaltoroid to determine the earth fault current as longas it has the following characteristics:

Rated primary current any

Rated secondary current 1 A

Performance 1 VA

Class of precision,ultimate precision factor Cl. 3 or higher

Use of the external toroid for determining the earthfault current is recommended when very low set-ting values of the 51N threshold are required (lessthan 0.45 times the rated current - In - of the cur-rent sensors).The use of the above-mentioned toroid is compul-sory when protection 51N is to be provided with 24kV circuit-breakers and 230 mm pole centre dis-tance.

Selection of the primary currentof the current sensors

External earth fault toroid

26


Release actuatorThe PR521 release unit carries out release of theoperating mechanism in the case of the protectionfunctions tripping, by means of an opening sole-noid (-MO3 - see accessory kit no. 13).

Self-supplyOperation of the PR521 unit is guaranteed by theself-supply circuit. The minimum value of phasecurrent needed for operation is 0.2 x In.This circuit is able to withstand:– overload: 1.5 x In continuous– overload: 6 x In for 200 sec.– overload: 25 kA for 1 sec. (short-time withstand

overcurrent of the circuit-breaker).

MTBFAn MTBF of 15 years at an operating temperatureof 40°C is expected.

Ambient conditionsAmbient temperature – 5 °C ... +40 °C

Storagetemperature – 40 °C ... +90 °C

Relative humiditywithout condensation 90%

Degree of protection (mounted on the circuit-breaker and with front protection) IP42

Operating frequencyFrom 45 Hz to 66 Hz.

InputsAnalogue inputs• Inputs for current sensors.

The current sensors which supply the signalsproportional to the current circulating in thephases and the energy required for self-supplyof the apparatus are connected to the PR521unit by means of these three inputs.

• Input for external earth fault toroid.The external earth fault toroid whose signal isdirectly proportional to the earth fault current isconnected to the PR521 unit by means of thisinput. This transformer does not supply the en-ergy for self-supplied operation of the relay.That input must be made using a braidedscreened telephone cable whose braiding mustbe earthed on the metallic box of the PR521(please refer to the wiring diagram enclosed withthe circuit-breaker).Because of EMC problems, the earthing connec-tion of the braiding must be as solid and short aspossible.

Binary input for control function• Input for circuit-breaker remote opening.

This input makes it possible to open the circuit-breaker remotely, exploiting the energy, ifavailable, supplied by the current sensors.This input must be made using a screenedtelephone cable whose braiding must be earthedon the metallic box of the PR521 (please refer tothe wiring diagram enclosed with the circuit-breaker).By connecting an external contact withoutpotential (e.g. the contact of a Buchholz relay) tothe special input connector, it is possible tocontrol circuit-breaker opening remotely throughthe PR521 release when the primary currentexceeds the value of 0.2 x In on at least onephase fitted with a current sensor.

27

t = K x b

3

t = K xb

II>

a

– 1

Captiont = trip timek = parameter which

can be set by theuser to select therequired trip curve

a,b = pair of parametersdepending on thetype of protectionwhich can be se-lected by the user

I = fault currentI> = trip threshold which

can be selected bythe user.

OutputsPower outputThis output controls the specific opening solenoidfor PR521 (-MO3 - see chapter 2).

Signalling output by means of closing contactAn output made by means of a bistable relay isavailable (it keeps the state even with a power cutand until the RESET operation), with closingcontacts without potential, through which the relaytrip signal is supplied.

After protection trip and circuit-breaker opening,this contact can be reset in two different ways:– with phase current higher than 0.2 x In, auto-

matic resetting takes place when the circuit-breaker closes;

– with phase current lower than 0.2 x In and theprotection unit off (even with the circuit-breakeropen), by means of the front bushing for RESETas defined in the “Test and reset function”.

N.B. This signalling contact is not enabled if a remote cir-cuit-breaker opening command is given or for the Testoperation of release functionality.

Protection functionsThe PR521 unit carries out the followingprotections:• PR521 - LSI: phase overcurrent protection

(instantaneous, with adjustable delay, withdefinite and fixed time)

• PR521 - LSIG: like PR521-LSI plus earth faultovercurrent protection (with adjustable delay).

The thresholds and trip times an be selecteddirectly by setting some Dip-switches on the frontof the unit.For fixed time protection, the trip time is given bythe following relationship:

For definite time protection, the relationshipbetween trip time and overcurrent is given by thefollowing formula:

Function Protection tripped

Type Bistable

Maximum change-over power 150 W / 1250 VA (resistive load)

Maximum change-over voltage 220 V– / 250 V ~

Maximum change-over current 5 A

Breaking capacity (UL/CSA):

– at 30 Vdc (resistive load) 5 A

– at 250 Vac (resistive load) 5 A

– at 250 Vac (cosj = 1.0) 5 A

– at 250 Vac (cosj = 0.4) 3 A

Mechanical life (at 180 operations/minute) 5 x 107

Electrical life 1 x 105

Insulation:

– between open contacts 1000 Veff (50 Hz / 1 min.)

– between contact and coil 3000 Veff (50 Hz / 1 min.)

28

CBA


Overcurrent protection with fixed timeA family of protection curves is available, definedas “Fixed time with adjustable delay DT” (inaccordance with the IEC 60255-3 Standards).The following settings are possible:

• 32 current threshold values (I>) (1)

0.200 0.225 0.250 0.275

0.300 0.325 0.350 0.375

0.400 0.425 0.450 0.475

0.500 0.525 0.550 0.575

— 0.625 0.650 0.675

0.700 0.725 0.750 0.775

0.800 0.825 0.850 0.875

0.900 0.925 0.950 0.975

1.000 — — — x In

• 16 trip times (t>),(with b = 1, K = 0.1…1.6 with steps of 0.1) (2)

0.1 0.2 0.3 0.4 0.5 —

0.6 0.7 0.8 0.9 1.0 —

1.1 1.2 1.3 1.4 1.5 1.6 s

The protection cannot be excluded.The I> protection for the DT curve processes thepeak value over the whole interval 0.2 … 20 x In.

(1) The unit guarantees thatit does not enter thethreshold for currentsunder 1.05 x I> set toguarantee threshold en-try for currents higherthan 1.30 x I> set.

(2) The tolerance over thetrip times with three-phase power supply is± 15% or ± 30 ms.

(3) The tolerance over thetrip times is ± 20% or± 150 ms.

Overcurrent protection with definite timeThree different families of protection curves areavailable (in accordance with the IEC 255-3Standards), defined as follows:• Normally inverse time NI• Very inverse time VI• Extremely inverse time EI.The following settings are possible:

• 32 current threshold values (I>) (1)

0.200 0.225 0.250 0.275

0.300 0.325 0.350 0.375

0.400 0.425 0.450 0.475

0.500 0.525 0.550 0.575

— 0.625 0.650 0.675

0.700 0.725 0.750 0.775

0.800 0.825 0.850 0.875

0.900 0.925 0.950 0.975

1.000 — — — x In

• 16 trip curves for each family, defined as follows (3)

a) Curves with normally inverse time (with a = 0.02, b =0.14, K = 0.1...1.6 with steps of 0.1)

b) Curves with very inverse time (with a = 1, b = 13.5, K=0.1...1.6 with steps of 0.1)

c) Curves with extremely inverse time (with a = 2, b = 80,K= 0.1...1.6 with steps of 0.1)

The protection cannot be excluded . The tripcurves move as the current thresholds change.The I> protection for the NI, VI, EI curves proc-esses the true effective value of the phase current.

A Dip-switch for setting the threshold value.

B Dip-switch for setting trip time.

C Position Dip-switches 1, 2 and 4 down to set the I>protection with fixed time.

29

BA

CBA C C

3

Overcurrent protection with adjustabledelayThe following settings are possible:

• 14 current threshold values (I>>) (1)

1.00 1.25 1.50 1.75

— 2.25 2.50 2.75

3.00 3.25 — 3.75

4.00 4.25 4.50 —

— — 5.50 — x In

• 8 trip times (t>>) (2)

0.10 0.20 0.30 0.40

0.50 0.60 0.70 0.80 s

The protection can be excluded.The I>> protection processes the peak value overthe whole interval 1 … 20 x In.

(1) The tolerance over thethreshold values is ±10%.


A Position all the Dip-switches down to exclude theprotection. The trip threshold is set by positioning theDip-switches appropriately.

B Dip-switch for setting the trip time.

Curves with normally inverse time

A Dip-switch for setting threshold value.

B Dip-switch for setting trip curve.

C Position Dip-switch 1 up and Dip-switches2 and 4 down to set protection I> tonormally inverse time.

Curves with extremely inverse time

C Position both Dip-switches 1 and 2 up andDip-switch 4 down to set protection I> toextremely inverse time.

Curves with very inverse time

C Position Dip-switches 1 and 4 down and Dip-switch 2 up to set protection I> to veryinverse time.

30

A B C

A


Instantaneous overcurrent protectionThe following settings are possible:

• 15 current threshold values (I>>>) (1)

2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17 x In

• Instantaneous trip time not adjustable(curve with intentional delay nil added)

The protection can be excluded.The I>>> protection processes the peak value overthe whole interval 2 … 20 x In.

Earth fault overcurrent protection withadjustable delay (internal vectorial sum)The earth fault current is calculated as thevectorial sum of the three phase currents. Theapparatus must therefore be fitted with threecurrent sensors (this solution is not possible for 24kV circuit-breakers with 230 mm pole centredistance).This sum is made by means of an internal toroid(which processes the secondary phase currents ofthe current sensors). Selection of this method iscarried out by means of the front Dip-switches.The following settings are possible:

• 14 current threshold values (Io>) (1)

0.45 0.50 0.55 0.60

0.65 0.70 0.75 0.80

0.85 0.90 0.95 1.00

1.05 1.10 x In

• 16 trip times (to>) (2)

0.00 (3) 0.05 0.10 0.15

0.20 0.25 0.30 0.35

0.40 0.45 0.50 0.55

0.60 0.65 0.70 0.75 s

The protection can be excluded.The Io> protection processes the peak value of theearth fault current over the whole interval 0 … 2.5 xIn.



(3) Curve with intentionaldelay nil added.

A Position all the Dip-switches up to select the internaltoroid. This setting defines the trip threshold equal to0.4 + the threshold set (see note B).

B Position all the Dip-switches down to exclude theprotection. The trip threshold is set by positioning theDip-switches appropriately.

C Dip-switch for setting the trip time.

N.B. The Io> protection function is activated if thecurrent exceeds the value of 0.2 x In on at least twophases or the value of 0.4 x In in single phase, whereasit is automatically excluded when the phase overcurrentexceeds the value of 2.5 x In.

A Position all the Dip-switches down to exclude theprotection. The trip threshold is set by positioning theDip-switches appropriately.

31

3

A B C

Earth fault overcurrent protection withadjustable delay (External Toroid)The earth fault current is calculated as the vectorialsum of the three primary phase currents.This sum is made by means of an external toroid(which processes the primary phase currents)installed directly on the power cables and there-fore, it is only possible to mount two currentsensors on board the apparatus (with network withinsulated neutral). This solution is compulsory for24 kV circuit-breakers with 230 mm pole centredistance. Selection of this method is carried out bymeans of front Dip-switches.The following settings are possible:

• 14 current threshold values (Io>) (1)

0.05 0.10 0.15 0.20

0.25 0.30 0.35 0.40

0.45 0.50 0.55 0.60

0.65 0.70 x In

• 16 trip times (to>) (2)

0.00 (3) 0.05 0.10 0.15

0.20 0.25 0.30 0.35

0.40 0.45 0.50 0.55

0.60 0.65 0.70 0.75 s



(3) Curve with intentionaldelay nil added.

Self-protection curve with fixed timeA self-protection curve of the electronic relay isavailable which intervenes at 20 x In with a fixedtime of 1 sec. The self-protection processes thepeak value of the phase current.

No type of adjustment is possible and the protec-tion cannot be excluded . This means that self-protection of the unit is carried out for phasecurrents over 20 x In without limiting the circuit-breaker breaking capacity (short-time withstandcurrent of 1 s).

The protection can be excluded. The Io> protec-tion processes the peak value of the earth faultcurrent over the whole operating interval.

Rated setting currents

Current sensor Protection function

In [A] I> (0.2...1xIn) [A] I>> (1...5.5xIn) [A] I>>> (2...17xIn) [A] Io> (0.05...0.7xIn) [A] Io> (0.45...1.1xIn) [A]External toroid (*) Internal toroid

40 8 ... 40 40 ... 220 80 ... 680 2.5 ... 35 18 ... 44

80 16 ... 80 80 ... 440 160 ... 1360 2.5 ... 35 36 ... 88

250 50 ... 250 250 ... 1375 500 ... 4250 2.5 ... 35 112.5 ... 275

1250 250 ... 1250 1250 ... 6875 2500 ... 21250 2.5 ... 35 562.5 ... 1375

In = rated current of the current sensorI> = overload current setting value (51)I>> = short-circuit current setting value (50)

I>>> = instantaneous short-circuit current setting value (50)Io> = earth fault current setting value (51N)(*) = If an external toroid is used (kit no. 16) with In = 50/1 A.

A Position the Dip-switch down to select the externaltoroid. This setting defines the trip threshold equal to0 + the threshold set (see note B).

B Position all the Dip-switches down to exclude theprotection. The trip threshold is set by positioning theDip-switches appropriately.

C Dip-switch for setting the trip time.

N.B. The Io> protection function is activated if thecurrent exceeds the value of 0.2 x In on at least twophases or the value of 0.4 x In in single phase.

32

Battery: 9V IEC SIZE: 6F22

PR512TEST

OPERATIONMODE1) Set the Dip-Switch

2) Insert the plug

3) Press TESTpushbuttonuntil the endof check

TRIP TEST

DEF. TIMEI> I>>TRIP

DEF. TIMEI> I>>TEST

OFF

1

A

A

A

B

3

B

A

A

--

2

A

B

B

--

4

B

B

A

--

PR511PR521TEST

TRIP TEST

RESET

OFF

1

A

A

B

3

B

A

--

2

A

B

--

4

--

--

--

1

B

A

2 3 4

LED optical signalling functionThe release has an optical indicator on the front(operating from 0.22 x In of phase), able to signalthe events shown in the table.

TEST and RESET functionBy means of the TT2 accessory (Test Unit whichcan be supplied on request), it is possible to carryout the overall TEST of relay release operation(electronic part and -MO3 opening solenoid) aswell as RESET of the “release tripped due to over-current signalling contact”. The latter function isonly enabled when the protection unit is completelyoff.

Auto-resetThe auto-reset function (automatic reset) forrelease tripped signalling takes place on re-closing of the circuit-breaker with primary currentequal to or higher than 0.2 x In on at least onephase fitted with a current sensor.


N.B. An error in current sensor setting is made when 2 or more sizes are selected simultaneously.

Current sensor setting error Protection I> under timing LED

No No Off

No Yes On

Yes No Flashes

Yes Yes Flashes

• By positioning Dip-switch 1 in position A, the TT2 unitis active (the Battery Check can be carried out).

• By positioning Dip-switches 1 and 2 in position A and3 in B, the TT2 unit carries out the circuit-breakeropening test by means of the YO3 opening solenoid.

• By positioning Dip-switches 1 and 3 in position A and2 in B, the TT2 unit resets the alarm (internalsignalling relay).

Front view of the TT2 Test Unit.

Rear view of the TT2 Test Unit.

33

t = K x 1

3

Trip curve with fixed time (DT) for overcurrent protection

34

100

10

1

0.1

0.01

21.3 3 4 5 67

89

10 20 30 4050

60 I/I>

t [s]

IEC 60255-3Normal Inverse Curve I>

t = K x0.14

II>

0.02

– 1

Trip curve with normally inverse time (NI) for overcurrent protection


35

100

10

1

0.1

0.01

21.3 3 4 5 67

89

10 20 30 4050

60 I/I>

t [s]

IEC 60255-3Very Inverse Curve I>

K = 1.6

K = 0.1

t = K x13.5

II>

– 1

3

Trip curve with very inverse time (VI) for overcurrent protection

36

100

10

1

0.1

0.01

21.3 3 4 5 67

89

10 20 30 4050

60 I/I>

t [s]

IEC 60255-3Extremely Inverse Curve I>

K = 0.1

K = 1.6

t = K x80

II>

2

– 1

Trip curve with extremely inverse time (EI) for overcurrent protection


37

100

10

1

0.1

0.01

0.60.7

0.80.9

1 102 203 4 55.5

6 I/In

t [s]

Definite Time Curve

7 89

I>>

t = t > >

3

Trip curve with fixed time for short-circuit protection with adjustable delay

38

100

10

1

0,75

0.1

0.01

0.2 0.3 0.4 0.5

0.45 2.5

0.60.7

0.80.9

1.1

1 2 3 45

6

X In

t [s]

Definite Time Curve Io>

I/Ion

t = to >

Trip curve with fixed time for earth fault protection by means of internal toroid


39

t = to>

3

100

10

1

0.1

0.75

0.01

0.04

0.05

0.06

0.07

0.08

0.09

0.1 10.2 20.3 30.4 40.5 5

0.6 6I/Ion

t [s]

Definite Time Curve

0.70.8

0.9

Io>

Trip curve with fixed time for earth fault protection by means of external toroid

40

41

4

Interruttore fisso - comando laterale destro -12-17,5-24 kV - interasse poli P = 230 mm 42

Interruttore fisso - comando laterale destro -12-17,5-24 kV - interasse poli P = 300 mm 43

DIMENSIONI DI INGOMBRO

42

TN

736

7

DIMENSIONI DI INGOMBRO

Interruttore fisso comando laterale destro - 12-17,5-24 kV interasse poli P = 230 mm

Vista da A Vista da B

43

4T

N 7

368

Interruttore fisso comando laterale destro - 12-17,5-24 kV interasse poli P = 300 mm

Vista da A Vista da B

44

45

5ELECTRIC CIRCUIT DIAGRAM

Diagrams of the applications 46

State of operation shown 49

Caption 49

Description of figures 50

Incompatibility 50

Notes 51

Graphic symbols for electric diagrams 52

46


Diagrams of theapplicationsThe following diagramsshow the fixed circuit-breaker circuits, deliv-ered to the customer bymeans of the “XV” ter-minal box.However, to take intoaccount product devel-opment, it is alwaysnecessary to refer tothe circuit diagram sup-plied with each circuit-breaker.

47

5

48


49

5

State of operation shownThe diagram indicates the following conditions:– circuit-breaker open– circuits de-energized– closing springs discharged– releases not tripped– undervoltage release activated.

Caption= Reference number of diagram figure

* = See note indicated by the letter

A1 = Operating mechanism accessories

A4 = Switchboard accessories (indicativedevices and connections for controland signals)

-BMO = Device for control of shunt openingrelease coil continuity (see note E)

-B51 = Microprocessor-based type PR512overcurrent release with the follow-ing protection functions (for PR512release outside the circuit-breaker -see note D):

– against overload with longdefinite, inverse, very inverse orextremely inverse trip time-delay

– against short-circuit with shortdefinite trip time-delay

– against short-circuit with instanta-neous trip time

– against earth fault with shortdefinite trip time-delay (on re-quest)

-B51/-MO3= Contact for electrical signalling ofcircuit-breaker open due to overcur-rent pressure

-MM = Closing spring charging motor (seenote C)

-Q = Main circuit-breaker

-B/1...12 = Circuit-breaker auxiliary contacts

-F60 = Thermomagnetic circuit-breaker forprotection of the spring-chargingmotor (see note F)

-BMU = Contact for electrical signalling ofundervoltage release disabled

-B33M/1-2 = Spring charging motor limit contacts

-SC = Pushbutton or contact for circuit-breaker closing

-SO = Pushbutton or contact for circuit-breaker opening

-SO3 = Contact for circuit-breaker openingby means of the -MO3 solenoid

-BI/L 1...L3 = Current transformers located onphases L1-L2-L3 to supply thePR521 microprocessor-basedrelease with power

-BI/O = Homopolar current transformer,outside the circuit-breaker and withconnections to be made by thecustomer, for the PR521 microproc-essor-based release (see note G)

-TR1,-TR2 = Rectifiers for the -MO1 and -MO2releases supplied in AC

X3...X5 = Connectors of the accessories

-XK1 = PR521 microprocessor-basedrelease current circuit terminalboard

-XK2,-XK3 = PR521 microprocessor-basedrelease auxiliary circuit connectors

-XV = Delivery terminal board of circuit-breaker circuits

-MC = Shunt closing release

-MO1 = First shunt opening release (seenote E)

-MO3 = PR512 microprocessor-basedrelease opening solenoid (forPR512 release outside the circuit-breaker - see note D)

-MU = Instantaneous undervoltage releaseor with pneumatic time-delay device(see note 6)

-FZ = Filter (only provided with 220 V d.c.power supply voltage)

50


Description of figuresFig. 1 = Closing spring charging motor circuit

(see note C).

Fig. 2 = Shunt closing release (anti-pumping ismechanical).

Fig. 5 = Instantaneous undervoltage release orwith time-delay device (see note B).

Fig. 7 = First shunt opening release circuit withpossibility of continuous control of thewinding (see note E).

Fig. 9 = Second shunt opening release circuitwith possibility of continuous control ofthe winding (see note E).

Fig. 10 = Opening solenoid for PR512 micro-processor-based release outside the cir-cuit-breaker see note D).

Fig. 20 = Contact for electric signalling of under-voltage release disabled

Fig. 21 = Thermomagnetic spring charging motorprotection circuit-breaker (see note F).

Fig. 22 = Contact for electrical signalling ofsprings charged.

Fig. 23 = Contact for electrical signalling ofsprings discharged.

Fig. 24 = Contact for electrical signalling of under-voltage release energised (see note B).

Fig. 25 = Contact for electrical signalling of under-voltage release de-energised (see noteB).

Fig. 26 = Contact for electrical signalling of motorprotection circuit-breaker closed.

Fig. 27 = Contact for electrical signalling of motorprotection circuit-breaker open.

Fig. 31 = Set of five available circuit-breaker auxil-iary contacts (see note H).

Fig. 33 = Set of fifteen available circuit-breakerauxiliary contacts (see note H).

Fig. 41 = PR521 microprocessor-based releaseauxiliary circuits.

Fig. 42 = PR521 microprocessor-based releasecurrent circuits supplied by two currenttransformers (can only be used with net-works with insulated neutral and negligi-ble earth fault currents).

Fig. 43 = PR521 microprocessor-based releasecurrent circuits supplied by three currenttransformers.

Fig. 44 = PR521 microprocessor-based releasecurrent circuits supplied by two currenttransformers and by a homopolar cur-rent transformer.

Fig. 45 = PR521 microprocessor-based releasecurrent circuits with protection againstearth fault, supplied by three currenttransformers and (if provided, by thecustomer) by a homopolar current trans-former (see note G).

Incompatibility

The combinations of circuits given in the figuresbelow are not possible on the same circuit-breaker:

10-41 24-25

31-33 26-27

10-42-43-44-45

22-23

51

5

NotesA) The circuit-breaker is only fitted with the

accessories listed in the order acknowledge-ment.

B) The undervoltage release can be supplied inthe version for power supply with voltagebranched on the supply side of the circuit-breaker or from an independent source. Theuse of both the instantaneous and electronictime-delay device undervoltage release isallowed (outside the circuit-breaker). Circuit-breaker closing is only allowed with therelease energised (the lock on closing isachieved mechanically).

On request, the contact in fig. 24 or the one infig. 25 is available (signalling is permanent).Should there be the same power supply for theshunt closing and undervoltage releases andautomatic circuit-breaker closing on return ofthe auxiliary voltage is required, it is necessaryto introduce a delay of at least 50 ms betweenthe moment of undervoltage release consentand energisation of the shunt closing release.This can be done by means of a circuit outsidethe circuit-breaker including a permanentclosing contact, the contact indicated in fig. 24and a time-delay relay.

C) Check the power available on the auxiliarycircuit to verify the possibility of starting severalmotors for charging the closing springs at thesame time. To avoid excessive absorption, it isnecessary to charge the springs manuallybefore supplying the auxiliary circuit withvoltage.

D) Please see diagram 401530 for the connec-tions between the circuit-breaker auxiliarycircuits and the PR512 microprocessor-basedovercurrent release located in the switchboard.

E) The circuit for controlling continuity of the shuntopening release winding must only be used forthis function. With power supply of less than220V, connect the “Control Coil Continuity”device or a relay or signalling lamp whichabsorbs a current not exceeding 20 mA.With power supply at or higher than 220V,connect a relay or signalling lamp whichabsorbs a current not exceeding 10 mA.Other uses jeopardise soundness of the re-lease.

F) The -F60 circuit-breaker in fig. 21 must alwaysbe provided when there is a spring-chargingmotor supplied at 24V d.c. In the case of open-ing caused by a fault in the motor, it is alwaysnecessary to complete spring charging bymeans of the special handle before carryingout manual resetting.

G) If you want to use the -BI/O transformer,remove the bridges 24-25-26 of terminal board-XV.

H) When fig. 9 is required, contact -B/15 is nolonger available for figs. 31-33. If fig. 9 is notrequired, contact -B/15 can be used by elimi-nating the connection in parallel with contactQ5. When fig. 7 is required, contact -B/1 is nolonger available for figs. 31-33. If fig. 7 is notrequired, contact -B/13 can be used by elimi-nating the connection in parallel with contact -B1.

52

5ELECTRIC CIRCUIT DIAGRAM

Thermal effect

Electromagnetic effect

Pushbutton control

Conductor connections

Terminal or clamp

Socket and plug(female and male)

Resistor (general symbol)

Capacitor (general symbol)

Motor (general symbol)

Earth (general symbol)

Mass, frame

Make contact

Break contact

Closing position contact(limit switch)

Opening position contact(limit switch)

Circuit-breaker with automaticrelease

Control coil (general symbol)

Conductors in shielded cable(e.g. two conductors)

Current transformer

Current transformer withwound secondary and primaryconsisting of three bushingconductors

Rectifier with two half-wavesOvercurrent relay withadjustable long time delaycharacteristic

Instantaneousovercurrent relay

Earth fault overcurrent relaywith long adjustable time delaycharacteristic

Overcurrent relay withadjustable short time delaycharacteristic

Overcurrent relay withinverse long time delaycharacteristic

Graphic symbols for electric diagrams

Lamp (general symbol)

ABB Trasmissione & Distribuzione S.p.A.Unità Operativa Sace T.M.S.Via Friuli, 4I-24044 DalmineTel: +39 035 395111Fax: +39 035 395874E-mail: [email protected]://www.abb.com

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