P921&P922

8/12/2019 P921&P922

http://slidepdf.com/reader/full/p921p922 1/16

MiCOM P921, P922 & P923 Voltage and Frequency relays

MiCOM P921, P922 &P923 - Voltage andFrequency relays

T & D

Protection & Control

8/12/2019 P921&P922


MiCOM P921, P922 and P923 Voltage and frequency relays

Introduction

Part of the new MiCOM range, the

P921, P922 and P923 relaysprovide reliable and highperformance voltage and frequencyprotection.

Their versatility of application andthe association of protectionfunctions with automation, controland measurement functions, as wellas maintenance reduction, providean optimal and innovative solution.

Application

Two voltage ranges are availableto cover the large variety of controlapplications: reference voltagelevels supported by MiCOM P921,P922 and P923 relays from

57V to 480V.

Because of the 3 independentphase overvoltage and phaseundervoltage thresholds, MiCOMP921, P922 and P923 relays areable to provide effective voltageprotection: a typical applicationmight be the protection of motorsand generators. The configurabledetection logic (AND, OR) can alsoindicate the absence of voltage,

when the undervoltage protectionis used.

The 3 zero-sequence overvoltagethresholds can be applied :

• to detect earth faults at theneutral point of generators, withMiCOM P921, P922 and P923relays being insensitive to the3rd harmonic

• to detect earth faults for neutralelectrical systems which are veryimpedant or isolated, whilstavoiding the expensive use andinstallation of core balance CTs.

The negative sequence overvoltageprotection provided by the MiCOMP922 and P923 relays is designedto detect unbalanced conditions: itcould therefore be used for motorstarters, in which any unbalancewill lead to overheating anddamage.

The MiCOM P922 and P923relays integrate 6 frequencythresholds which are used forautomated load shedding/loadrestoration.

Figure 1 :

MiCOM P922

Models available

MiCOM P921: voltage protection

relays, 2 logic inputs, 4 outputs.

MiCOM P922: voltage andfrequency protection relays, eventand fault records, disturbancerecorder, 5 logic inputs, 8 outputcontacts.

A G version (CORTEC code option)is available to meet thespecifications of EDF GTE 2666,types 1 and 2.

MICOM P923 : Voltage and

frequency protection relay (Plus therate of change of frequencyelement df/dt), event and faultrecords, disturbance recorder,5logic inputs, 8 output contacts.

8/12/2019 P921&P922


5 optoinputs

RS485Communication

Setting software

3 phases VTs

Watchdog

7 auxiliaryoutputs

Trip output

P923930 86

47

WD

RS232 RS485

27 5959N 27D

81U 81OLoadingresistor

81R

Figure 2 : Application of the

MiCOM P923

In addition, the MiCOM P923relays provide 6 thresholds of instantaneous rate of change of frequency (df/dt) or averagemeasurements over a settable time

interval.These elements are suitable forsevere disturbances to acceleratethe load shedding when thisoperation, in small step, may not besufficient to bring the system back tonormal operating condition.

In order to adapt the protectionscheme to each application,programmable logic equations areavailable and allow the

combination of MiCOM P921,P922 and P923 internal protectionfunctions of relays with externalsignals from other protectiondevices on the system. Thisflexibility reduces both externalwiring and the use of auxiliaryrelays.

The MiCOM P921, P922 andP923 relays primarily providefast and accurate protectionfor use in numerousapplications. In addition, theyoffer the following benefits:

• protection, control,measurements and recordsin a single case, thereby

reducing the number of devices and the total cost of installation

• clear indication of eventswhich have taken place,via explicit messages andprogrammable LEDs on thefront panel, increasingoperational efficiency

• simple integration intocontrol systems through theuse of a large number of

available standardcommunication protocols,with no additional cost

Advantages of MiCOM P921, MiCOM P922 and MiCOM P923 relays

• standardization of cases,identical to the MiCOMP120 series relays.

• diagnostic supportfollowing a fault, throughthe use of event recordsand disturbance records

• maximum security providedby periodic self-tests

• increased flexibility throughlogic inputs, outputcontacts, LEDs andprogrammable logicequations

• 3 different ways of enteringthe relay settings whilstconstantly aiming atproviding the safety, speedand simplicity required forthis type of operation

• possibility of using a"battery" box (MiCOM E1)to set the relay, without the

need to provide anauxiliary supply

• powerful and intuitiveMiCOM S1 supportsoftware designed tominimize the need fordocumentation and training

Figure 3 : Battery Box MiCOM E1

3

Compliant with EDF GTE 2666specifications, the G version of theMiCOM P922 providesinterconnection protection forembedded generator suppliesconnected to distribution networks.It can also be used to switchto/from MPP (make on power

present) mode by instantaneouslyforcing a trip. The possibility toprogram output contacts 1 and 2as fail-safe is given, in order to beapplied with fail-safe coils.

Remote setting can be prohibitedfor this G version.

8/12/2019 P921&P922


Functions available

Functions ANSI Codes MiCOM P921 MiCOM P922 MiCOM P923

Version S Version G

Protection

Configuration depending on the numberand type of voltage transformers X X X X

Phase-to-neutral or phase-to-phase voltage protection X X X XPhase undervoltage (AND/OR logic) 27 X X OR Logic X

Phase overvoltage (AND/OR logic) 59 X X OR Logic X

Settable Hysteresis X X

Zero-sequence overvoltage 59N X X X X

Negative sequence overvoltage 47 X X

Positive sequence undervoltage 27D X XUnder/overfrequency 81U/81O X X X

Rate of change of Frequency 81R X

Nominal operating frequency: 50 Hz/60 Hz X X X X

Inhibition of voltage & frequencyprotection functions X

Inhibition of timers(instantaneous forcing) XControl

Programmable logic equations X X X X

Programmable logic inputs and outputs 30 X X X X

Fail-safe operation X

Blocking logic X X X

Undervoltage Blocking X

Circuit breaker control X X X X

Latching of output contacts 86 X X X XSetting groups for protection parameters 1 2 2 2

Possible prohibition of remote setting X

Measurements

Phase-to-neutral or phase-to-phase voltages with trueRMS values X X X X

Residual voltage with true RMS value X X X X

Frequency X X X X

Positive and negative sequence voltages X X

Rolling and peak values X XLogs and records

Event records X X XFault records X X X

Disturbance records X X X

Frequency Disturbance records X

Monitoring

Monitoring the position of the circuit breaker X X X X

Data for circuit breaker maintenance X X XCommunications

Remote communication (RS485 port) X X X X

Local communication (RS232 port) X X X X

User interface

Back-lit LCD display X X X XProgrammable LEDs X X X X

Password-protected access(with optional transparent front cover) X X X X

Compatible setting software MiCOM S1(Windows) X X X X

8/12/2019 P921&P922


Protection functions

Configuration depending

on the VT

MiCOM P921, P922 and P923relays can be used in the followingconfigurations:

• "3 phase-neutral VTs" or"3 phase-neutral VTs and1residual VT":The voltage protection elementcan therefore operate either frommeasured phase-to-neutralvoltages, or from phase-to-phasevoltages which have beeninternally calculated by the relay.Zero-sequence overvoltageprotection will always beavailable, the presence of theresidual VT is designed to

display the true RMS value of theresidual voltage,

• "3 phase-phase VTs and1 residual VT" or"2 phase-phase VTs and1 residual VT":The voltage protection elementcan only operate from measuredphase-to-phase voltages. If theresidual VT is not connected, thezero-sequence overvoltageprotection will not be available.

• The MiCOM P922-G is onlydesigned to operate with the"3 phase-neutral VTs" or"3 phase-phase VTs"configuration.

Voltage protection

For each function listed below, aninstantaneous signal and a time-delayed signal is available foreach threshold.

For time-delayed signals, the first

threshold of each function ("lowthreshold") offers the choicebetween a definite timer and aninverse timer, to which a reset timercan be assigned. The otherthresholds only have one definitetimer.

In the case of the MiCOM P922-G,all thresholds have definite time-delays and the only detection logicis the "OR" logic.

Under/Overvoltage (27/59)Three thresholds are available foreach function: each one can beindependently activated ordeactivated.

If a threshold is activated, it can beconfigured to detect:

• an overvoltage on the 3simultaneous phases (logic"AND") or on at least one of thephases (logic "OR") for the"Overvoltage" function

• an undervoltage on the 3simultaneous phases (absence of

voltage with the "AND" logic) oron at least one of the phases(logic "OR") for the"Undervoltage" function

• The MiCOM P922 and P923relays provide a programmablehysteresis(drop- out / pick-up ratio) as apercentage of the under voltageand over voltage settings values.

• The MiCOM P923 provides asettable under voltage Block of all the protection and control

elements based on thefrequency.

Zero-sequence overvoltage(59N)

Three thresholds are available:each one can be independentlyactivated or deactivated.

Depending on the VT configuration,MiCOM P921, P922 and P923relays will operate from the zero-sequence voltage, which is

calculated internally, or from theresidual voltage, which is measureddirectly.

Negative sequenceovervoltage (47) -MiCOM P922 (S version)and P923

Two thresholds are available: eachone can be independently activatedor deactivated.

This function is based on the

negative-sequence component of the voltage, which is calculatedinternally and displayed on thescreen of the front panel: It isdesigned to detect any voltageunbalance condition.

Positive sequenceundervoltage (27D) -MiCOM P922 (S version)and P923

Two thresholds are available: Eachone can be independently activatedor deactivated.

This function is based on thepositive phase sequencecomponent of the voltage, which iscalculated internally.

Frequency protections

Frequency protection functions areinhibited from a certain level of themeasured secondary voltage(adjustable level on G version).

Under/Overfrequency

(81U/81O) - MiCOM P922

and P923Six thresholds are available: Eachone can be configured to detect anunder or overfrequency within therange [fn - 10Hz, fn + 10Hz],where fn is the nominal frequencyselected (50Hz or 60Hz).

A definite timer is assigned to eachthreshold.

Rate of Change of Frequency

(81R)- MiCOM P923Six threshold are available: Eachcan be configured independentlywithin the range[-10 Hz/s, +10 Hz/s].These functions are based on thecalculation of the instantaneousrate of change of frequency over asettable integration time (number of cycles).

Automation

Earth fault (V0>)

Trip&

Timer

Manualclose

(tAUX1)

Figure 4 : Logic equations

Programmable logic equations

Two programmable logic equations(AND) are available withMiCOM P921 and P922 relays.Four programmable logic equations(AND) are available withMiCOM P923.

A pick-up timer and a drop-off timer can be assigned to eachequation.

These equations are not defined ingraphic form, they can thus becalculated directly from the frontpanel, thereby avoiding the needfor dedicated software.

8/12/2019 P921&P922


Inputs/Outputs/Programmable LEDs

All logic inputs, output contacts(excluding the RL0 changeoveroutput contact, dedicated to the"relay failed" function) and the 4LEDs of the MiCOM P921, P922and P923 relays can be

programmed.This affects in particular all logicsignals (instantaneous, time-delayed) in the relays which can becombined with the different outputcontacts and LEDs.

Blocking logic

When MiCOM relays are used inelectrical systems, the managementof the different protection modulesmust take surrounding devices into

consideration. Two blocking inputsare independently configurable.When active, they freeze theassociated protection timers andwhen they drop-off, they re-imposethe initial value if the faultconditions are still present.

Output contact latching (86)

Each output contact can beprogrammed to be latched once thefault has cleared: The latched

contacts can be reset either directlyon the front panel of the relay,locally (RS232 port) or remotely(RS485 port).

Setting groups for protection

functions

The MiCOM P922 and P923 relayshave two independent settinggroups, which are used to adaptthe protection functions to differentoperating conditions. The two

groups can be switched byactivating a dedicated logic input,or by the operator via the frontpanel, or locally (RS232 port) orremotely (RS485 port). Typically,these two setting groups can beused to switch from GTE type 1.4to GTE type 1.1 for theMiCOM P922 G version.

The switch from one setting groupto another will only take effect if noprotection or automation functions

are running, to prevent unwantedtripping.

Measurements

In accordance with theconfiguration of the VTs connectedto MiCOM P921, P922 and P923relays, the following values will bedisplayed as true RMS values onthe back-lit screen:

• phase-to-neutral voltages Ua, Ub, Uc

• phase-to-phase voltages Uab,Ubc, Uca

• residual voltage Vo

• frequency.

In addition, the MiCOM P922(S version) and P923 relayscalculate the following valuesinternally:

• positive sequence voltage

• negative sequence voltage

• peak values of phase-to-neutralor phase-to-phase voltages

• rolling values of phase-to-neutralor phase-to-phase voltages

All measurements are availablelocally or remotely.

Logs and records

All event, fault and disturbancerecords are time-stamped to 1ms bythe internal real time clock.

In the event of a loss of auxiliarypower, a lithium battery is used tosave the records, the date and thetime. Checked at regular intervals,the battery can be easily accessedfrom the front panel if it has to bereplaced.

Event records

Any change of state of logic inputs,output contacts or protection

functions will be recorded in thenon-volatile memory of theMiCOM P922 and P923 relays,with a maximum of 75 events.When the memory is full, the oldestevents will be deleted, which willincrease the storage capacity formore recent events.

Each event can either be displayedlocally using the MiCOM S1support software (RS232 port) orremotely (RS485 port).

Fault records

The MiCOM P922 and P923 relayscan store the last 5 faults that haveoccurred in non-volatile memory.

Each record provides the followinginformation:

• date and time of fault

• origin of fault (undervoltage, etc.)

• faulted phase(s)

• magnitude of the quantity whichlead to the fault

• magnitude of phase-to-neutral orphase-to-phase voltages

• magnitude of the zero-sequencevoltage (if available)

All this information can be restoredlocally, using the MiCOM S1setting software (RS232 port), orremotely (RS485 port).

Disturbance records

Five disturbance records, eachlasting 2.5 seconds, can be storedin non-volatile memory by MiCOMP922 and P923 relays. Thesampling frequency is fixed at 32samples per cycle. The mechanismthat triggers the recording can beconfigured: Instantaneous signals,time-delayed signals, or activationof a dedicated logic input.

The various recordings can berestored locally (RS232 port) or fed

back remotely (RS485 port).

Frequency disturbance

records

One frequency disturbance record,lasting 20 secs can be stored innon-volatile memory by the MiCOMP923 relay. The sampling frequencyis fixed at 1 sample per cycle. Themechanism that triggers therecording can be configured:instantaneous or time delayedtripping, activation of a dedicated

logic input or time delayed logicequation signal.

The various recordings can berestored locally (RS232 port) or fedback remotely (RS485 port).

6

Disturbance Record Analysis

Figure 5: Disturbance Record Analysis

8/12/2019 P921&P922


Fully WINDOWS™ compatible(98, NT), the MiCOM S1 settingsoftware has been designed so thatall relay settings can be preparedin the office ("off-line" mode) andthe configuration file created canthen be loaded on-site.

The different information stored byeach MiCOM relay (measurements,event records, disturbance records,parameters, etc.) can also beretrieved by the software (storageon PC, printout of various files, etc.)and used on-site or processed at alater date.

7

Circuit breakermonitoring and control

Monitoring the position of

the circuit breaker

The use of logic inputs andprogrammable LEDs enables the

position of the circuit breaker to bedisplayed on the front panel.

Circuit breaker control

With MiCOM P921, P922 andP923 relays, the circuit breaker canbe controlled manually via logicinputs (AUX1 and AUX2), withlocal or remote communication: theopening and closing commandswill therefore activate theprogrammed output contacts.

Circuit breaker maintenance -

MiCOM P922 and P923

In addition to protecting andcontrolling the electrical network,the MiCOM P922-P923 relays willprovide preventive and curativemaintenance of the circuit breakers.The maintenance programs can beadapted in accordance with thedata supplied by the relay.

The MiCOM P922 and P923relays control the opening andclosing time of the circuit breaker,and monitor the number of operations carried out. An alarm istriggered as soon as the maximumopening or closing time, or themaximum permitted number of operations is exceeded.

Figure 7: Setting of MiCOM relay

using MiCOM S1

ModBus

K-Bus

Printer

Local supervisor(MiCOM S10...)

Figure 6 : Supervision System (MiCOM S10)

Communications

Two communication ports areavailable on MiCOM P921, P922and P923 relays: A rear port(RS485) for remote communicationand a front port (RS232) for localcommunication.

Remote communication

MiCOM P921, P922 and P923relays support MODBUS™,IEC 60870-5-103 or Courierprotocols.

They transmit to the localmonitoring system (MiCOM S10for instance) or to the SCADA,settings, measurements and alarms

as well as all records. Allcommunication settings (address,rate, parity, etc.) can beprogrammed by the user via theuser interface. A communicationfailure does not affect the MiCOMrelay protection functions.

Local communication

The RS232 port on the front panelof MiCOM P921, P922 and P923relays has two functions:

• to download a software versionto the relay (upgrade, changethe language setting, modify theremote communication protocol,etc.)

• to connect a PC which has thesetting software

Figure 8: Event display in

MiCOM S1

8/12/2019 P921&P922


+ + + +

E L 1

P r o g r a m a b l e s I n p u t s :

E L 2 E L 3

E L 4 E L 5

P h a s e s r o t a t i o n

C

B

2 9

C o m m u n i c a t i o n P o r t R S 4 8 5

( M o d b u s ,

C o u r i e r ,

I E C 6 0 8 7 0 - 5 - 1

0 3 )

R S 2 3 2 P o r t

( M i C O M S 1 )

N o t e s :

( 5 )

2 3

2 7

2 5

2 1

1 9

S h o r t c o n n e c t o r

L o n g c o

n n e c t o r

( 4 ) T e r m i n a t i n g r e s i s t o r f o r t h e l a s t r e l a y , t o b e c o n n e c t e d b e t w e e n 3 0 a n d 3 2

3 0

3 2

3 1

– +

C a s e e a r t h

S e e

N o t e 4

S e e

N o t e 1

P r o g r a m a b l e T r i p p i n g

o u t p u t

P r o g r a m a b l e o u t p u t s :

W a t c h d o g

3 4

M i C O M

P 9 2 1 , P 9 2 2

a n d P 9 2 3

2 6

1 7

2 8

2 4

2 2

1 3 1

5 1 1

R L 1

V o i r

n o t e 3

V o i r

n o t e 1

V o i r

n o t e 2

5 9 7 1 3 2 0

1 8 1

0 8 1 6

1 4 1

2 2 4

3 3

/ +

W D

6

M I D O S C o n n e c t o r s : R e a r v i e w

( s e e n o t e 5 ) 4

7 5 5

5 3

4 9

5 1

3 7 4

5 4 3

4 1

3 9

3 5

3 3

2 9

3 1

4 8

5 6

5 4

5 2

5 0 3

8 4 6

4 4

4 2 4

0 3 6

3 4

3 2

3 0

R L 8

P C B C o

n t a c t

" 3 V T s " C O N F I G U R A T I O N

( P h a s e - N e u t r a l )

" 3 V T s +

R e s i d u a l " C O N F I G U R A T I O N

" 2 V T s +

R e s i d u a l " C O N F I G U R A T I O

N

+ – – – – –

( 2 ) A d d i t i o n a l H a r d w

a r e f o r t h e M i C O M P 9 2 1 ,

P 9 2 2 - S a n d P 9 2 3 r e l a y s

( 3 ) F a i l s a f e o p e r a t i o

n p o s s i b l e f o r M i C O M P 9 2 2 - G

( 1 ) A d d i t i o n a l H a r d w

a r e f o r M i C O M P 9 2 2 a n d P 9 2 3 r e l a y s

R e s i d u a l

P h a s e C

5 0

4 9

4 6

4 4

4 5 P h a

s e B

P h a s e A

4 2

4 3

4 1

~ /

–

~

3 6

3 5

3 7

2 4

2 3

2 7

2 5

2 8

2 6 2

1 2 1

1 9

1 5

1 7

1 3

2 2

2 0

1 6

1 8

1 4

7 9 1 1 5 3

8 1 2

1 0 6 4

A

L E D s

4 p r o g r a m a b l e L E D s

4 4

5 0

4 6

4 9

4 5

4 2

4 3

4 1 P

h a s e A

P h a s e B

P h a s e C

R e s i d u a l

4 4

5 0

4 6 R e

s i d u a l

4 9

P h a s e C

4 5

4 2 P h a

s e B

4 3 P h a

s e A

4 1

R L 7 R L 6

R L 5 R L 4

R L 3 R L 2

A u x i l i a r y

V o l t a g e

s u p p l y

S c h e m e r e p r e s e n t i n g

M i C O M r

e l a y o f f

Figure 9 : Connections

8/12/2019 P921&P922


Hardware description

Figures 10 and 11 show thehardware configuration of eachMiCOM P921, MiCOM P922 andMiCOM P923 relays. These figuresclearly show that all 3 relays arehoused in drawout cases of thesame size.

MiCOM P921, P922 and P923relays can either be rack or panel-mounted. Identical to MiCOMseries 120 relays, connections aremade via Midos type terminalblocks, where each connectionpoint has 2 Faston and one screwfixings. The connection diagramsare identical for all models, therebyensuring maximum compatibility.

User interface

The user interface for MiCOMP921, P922 and p923 relayscomprises:

• back-lit, 2 x 16 charactersLCD display,

• four dedicated LEDs to provide

information such as "Trip","Alarm", "Warning" and"Relay Healthy"

• four programmable LEDs: Eachone lights up when protectioninformation is displayed, or if alogic input state changes

• five tactile keys for scrollingthrough the menus ( )and entering settings ( ): thepull-down structure of the menus

enables quick and easy access torequired information

• 1 key for reading ( ) andone for acknowledging ( )alarms

• a top cover indicating theproduct name. This cover can belifted for access to the technicalspecifications of the relay(ordering code, serial number,etc.)

• a lower cover which protects theRS232 serial port and the lithiumbattery

• an optional transparent frontcover for the front panel, toprevent the settings from beingchanged, and to prevent accessto the battery and RS232 port

The operator dialogue languageshould be specified at the time of order.

Labels supplied with the relay canbe used to customise the captionsfor the programmable LEDs.

The default display can be selectedby the user from the list of availableoptions.

Restricted access

All access to MiCOM P921, P922and P923 relays settings ispassword-protected. A defaultpassword is set on delivery, but thispassword can be changed at anytime.

For easy operation, the alarms canbe cancelled without entering apassword.

Range of settings

Undervoltage (27)

3 independent threshold detectionlogic: AND/OR

threshold settings:

• from 5 to 130V, steps of 0.1V,range 57-130V


1 timer per threshold

• Settable Hysteresis :from 102% to 105%

Overvoltage (59)

3 independent threshold detectionlogic: AND/OR

Threshold settings:

• from 5 to 260V (200V for the 1stthreshold), steps of 0.1V, range57-130V

• from 20 to 960V (720V for the1st threshold), steps of 0.5V,range 220-480V


• Settable Hysteresis :From 95% to 98%

Zero-sequence overvoltage

(59N)3 independent thresholds

Threshold settings:

• P921- P922 - P923:from 5 to 130V , stepsof 0.1V, range 57-130V

from 2 to 480V, steps of0.5V, range 220-480V


• P922G:from 2 to 130V , steps

of 0.1V, range 57-130Vfrom 10 to 480V, steps of0.5V, range 220-480V


9

Figure 10 : MiCOM P921, P922 et P923

Front View

G

C

8/12/2019 P921&P922


Negative sequence

overvoltage (47)

2 independent thresholds

Threshold settings:


• from 20 to 720V, steps of 0.5V,

range 220-480V1 timer per threshold

Positive sequence

undervoltage (27D)


Threshold settings:




Under/overfrequency

(81U/81O)


Configuration: under oroverfrequency

Threshold settings: [f n-10Hz,f n+10Hz], steps of 0.01Hz,

with f n = nominal frequency

1 definite timer per threshold

1 settable voltage lockout threshold(P922-G):

• from 5.7 to 130 Vfor a range of 57-130 V(fixed to 5.7V for P922-S)

• from 22 to 220 Vfor a range of 220-480 V(fixed to 22V for P922-S)

Rate of change of frequency

(81R)• 6 independent thresholds

• Threshold settings:[-10Hz/s , +10 Hz/s]

• Integration Time (Number of cycle): from 1 to 200

• Validation number for protectionoperation: 2 or 4

1 settable Undervoltage Blockingthreshold ( V< BLK )

• From 5V to 130V for a range of 57-130V

• From 20V to 480V for a range of 220- 480V

Timers

Voltage thresholds:

• definite time for all thresholds(MiCOM P922-G)

• definite or inverse timefor the 1st threshold

• definite time for the

2nd and 3rd thresholdsDefinite timer:

• from 0 to 599s, steps of 0.01s

Inverse timer:

• TMS from 0.5 to 100, steps of 0.5

• tRESET from 0 to 100s, steps of 0.01s

• formula

Frequency thresholds:

Definite timer:


Auxiliary timers:

• 2 independent timers: tAUX1 andtAUX2


Monitoring and controlLogic equations

• 2 or 4 " logic AND"

• 1 pickup time delay per equation

• 1 drop-off time delay perequation

Timer settings:


Circuit breaker control

Duration of closing impulse:

• from 0.1 to 5s, steps of 0.1s

Duration of opening impulse:

• from 0.1 to 5s, steps of 0.1s

Circuit breaker monitoring

Maximum number of operations:from 0 to 50000

Maximum closing time:from 0.1 to 5s, steps of 0.1s

Maximum opening time:from 0.1 to 5s, steps of 0.1s

Disturbance records

5 files, each 2.5s

Adjustable pre- and post-fault time:from 0.01 to 2.5s, steps of 0.01s

Sampling frequency:32 samples per cycle

Data recorded: voltages andfrequency, state of logic inputs,

output contacts and protectionfunctions

Trip mode:

• instantaneous

• time-delayed

• following the activation of adedicated logic input

• remotely via communication

Frequency disturbance

records

Sampling frequency :1 sample per cycle

A 5 s pre-fault time, and a15 s post-fault time

Recording mode:

• Remotely via the communication

• Instantaneous or time-delayedtripping

• Following the activation of adedicated logic input

• Following the logic equationtime-delayed information

Accuracy

Voltage thresholds:

• Accuracy ±2%

• Start occurs at “threshold” valuefor definite time

• Start occurs at 95% of “threshold”value for undervoltageat inverse time (± 2%)

• Start occurs at 110% of “threshold” value for overvoltage

at inverse time (± 2%)• Hysteresis: adjustable from 102%to 105% for the undervoltagethreshold, and from 95% to 98%for the overvoltage threshold

Frequency thresholds:

• ± 10mHz for V=0.2Vn

• ± 20mHz for 0.2Vn>V∅0.1Vn

• Hysteresis: ± 50mHz

• ± 0.5 Hz/IT for df/dt with IT :Integration time,

settable from 1 to 200Timers:

• ± 2% or 10ms for DT

• ± 5% or 40ms for IDMT

t =TMS

U

UThreshold

– 1

8/12/2019 P921&P922


Technical specifications

Voltage inputs (Vn)

4 voltage inputs

2 ranges available (RMS phase-phase voltage): 57-130V or 220-480V

Primary voltage:• from 0.1 to 100kV, steps of

0.01kV, range 57-130V

• from 220 to 480V, steps of 10V,range 220-480V

Secondary voltage:


• from 220 to 480V, steps of 10V,range 220-480V

Thermal withstand and

voltage input burden

Range 57-130V:260V continuous300V for 10sburden: < 0.25 VA

Range 220-480V:960V continuous1300V for 10sburden: < 0.36 VA

Frequency

Nominal frequency 50/60 Hz

Operating range 40/70 Hz

Auxiliary supply Vaux

Three ranges available

• 24 - 60 Vdc

• 48 -150 Vdc

• 130 - 250 Vdc /100 - 250 Vac, 50/60 Hz

Consumption:

DC: 3W (standby)+ 0.25W per energised outputrelay

AC: 6 VA (standby)+ 0.5VA per energised output relay

Logic inputs

Number of logic inputs:2 (P921), 5 (P922 and P923)

Configuration: active on low orhigh level or pulse for the inputdedicated to the change of settinggroup, active on low or high levelfor the other inputs

Polarisation: direct voltage withinthe same range as the auxiliaryvoltage

Response time: < 2ms

Burden: <10mA per logic input

Output contacts

Number of programmable outputcontacts:4 (P921), 8 (P922 and P923)

RL1 dedicated to tripsProgrammable fail-safe system forRL1 and RL2 (P922-G)

"Relay failed" indication contact

Characteristics:closing: 30A for 3scontinuous: 5A

break:135 Vdc, 0.3A (L/R = 30 ms)250 Vdc, 50W resistive or 25 W

inductive (L/R = 40ms) 220 Vca,5A (P.F = 0.6)

Mechanical withstand:> 10000 operations

Communication ports

Rear communication port

Connection: multidrop (32 units)Type of cable: twisted shielded pairLength of cable: 1000m max.Connectors: screw terminalsLink: RS485

Isolation: SELV

Front communication port

Connection: peer to peerCable type: multi-coreCable lenght: 15m max.Connectors: RS232 DTE, 9-pin,femaleLink: RS232Isolation: ELV

Backup battery

Saves the date and time of event,fault and disturbance records aswell as frequency disturbancerecord (P923 only) in the event of an auxiliary power failure

Battery type: lithium, 1/2 AA,3.6V, 850mAh, 10-year guarantee

Case

The characteristics of the case areshown in figure 11 (page13).

8/12/2019 P921&P922


Standard tests

Environment

• Temperature IEC 60255-6

Storage-25°C to +70°C

Operation-25°C to +55°C

• HumidityIEC 60068-2-3 56 daysat 93%

• RH and 40°C

• Enclosure protectionIEC 60529 IP 52, IK 07

• Vibrations IEC 60255-21-1

• Response and endurance,class 2

• Shock and bumpIEC 60255-21-11 class 1

• Seismic withstandIEC 60255-21-3, class 1

• EMC compliance

89/336/EEC

Conformity to EEC EMCdirectives can be found in the

technical construction file.The following genericstandards have been used as abasis for this conformity:

EN 50081-2: 1994EN 50082-2: 1995

• Product safety

73/23/EEC

Conformity to EEC low voltagedirectives.

Conformity is based on thefollowing generic safetystandards:

EN61010-1: 1993/A2: 1995EN60950: 1992/A11: 1997

Additional information

• Technical guide:ref. TG1. 1530

• MiCOM S1 user manual:ref. R8610

• MIDOS parts catalogue:ref. R7012

Standards

• Dielectric withstandIEC 60255-5

2 kV common mode1 kV differential mode

• Impulse voltage IEC 60255-5

5 kV common mode1 kV differential mode

• Insulation resistanceIEC 60255-5

> 100 MW

• High frequency disturbanceIEC 61000-4-1

2.5 kV common mode,class 31 kV differential mode,

class 3• Fast transient disturbance

IEC 61000-4-4ANSI C37.90.1

• Electrostatic dischargeIEC 61000-4-28 kV, class 4

• Radiation immunity

ANSI C37.90.235 V/mIEC 61000-4-3 10 V/m

8/12/2019 P921&P922


22625,1

Side view, flush mounting

151,2 max.

7851.8

10,5

158168

23,6

Alldimensionsin mm.

Panel cut-out flush mounting

fixing details

Relay weight (case + active part) 2,1 kg

99 4 holes Ø 4,4 (M4 screw)

103 (20 TE)

.

C

MiCOM P921

VA = 24.50 V

177

Face view

4 holes Ø 3,4

Figure 11 : Case dimensions

Outline description

Numerical protection for thedetection of voltage (P921, P922and P923) and frequency (P922and P923) variations in a 4Udraw out metal case.

A G version which meets EDF GTE

2666 specifications is available forthe P922 model.

The following functions areavailable in MiCOM P921, P922and P923 relays:

• 3 independent phaseovervoltage thresholds(instantaneous and time-delayed- ANSI 59 code)

• 3 independent phaseundervoltage thresholds

(instantaneous and time-delayed- ANSI 27 code)

• 3 independent zero-sequenceovervoltage thresholds(instantaneous and time-delayed- ANSI 59N code)

• 2 programmable logic equations(P921 - P922)

• Programmable I/O

• Relay latching (ANSI 86 code)

• Display of true RMS values

• An RS485 rear port compatiblewith one of the followingprotocols: MODBUS™, Courier,IEC 60870-3-105

The MiCOM P922 (S version) andMiCOM P923 relays offer thefollowing additional functions:

• 2 independent negativesequence phase overvoltage

thresholds (instantaneous andtime-delayed - ANSI 47 code)

• 2 independent positive sequencephase undervoltage thresholds(instantaneous and time-delayed- ANSI 27D code)

• Settable Hysteresis thresholds forUndervoltage and Overvoltagefunctions.

The MiCOM P922 relay,G version, is designed to:

• instantaneously force tripping totake account of make on powerpresent (MPP)

• program output contacts 1 and 2for fail-safe operation

• provide the possibility to prohibitall remote configurations

MiCOM P922 (S and G versions)and MiCOM P923 relays,therefore integrate:

• 6 independentover/underfrequency thresholds(instantaneous and time-delayed- ANSI 81U/81O codes)

• Records of the last 75 events,time-stamped to 1 ms

• Data records relating to the last

5 faults• Disturbance recorder with

storage of 5 records, eachlasting 2.5 seconds, 32 samplesper cycle

The MiCOM P923 relay offers thefollowing additional functions:

• 6 independent rate of change of frequency thresholds- ANSI 81R codes

• 1 adjustableundervoltage Blocking threshold

• 4 programmable logic equations

The user interface is common toMiCOM P921, P922 and P923relays and includes the followingelements:

• A 32-character alphanumericback-lit LCD display

• An RS232 front port compatiblewith application software andPC setting software

• Programmable LEDs withcustomised labelling

13

8/12/2019 P921&P922


Relay type

User interface language options (see note 1)

Voltage relayVoltage/frequency relay (only possibility for G application)

Voltage/frequency with (df/dt) relay

123

Français (choix unique pour application G)English

SpanishGermanItalianRussianPolishPortugueseDutchCzechHungarian

01

2345678AB

Voltage inputs

57 – 130 V220 – 480 V

AB

Application

Auxiliary voltage supply

StandardEDF / GTE2666 (types 1&2)

SG

24 – 60Vdc48 – 150Vdc130 – 250Vdc/100 – 250Vac 50/60 Hz

AFM

Communications protocol optionsModbus (only possibility for G application) K-BUS / CourierCEI 60870-5-103

123

Note 1 : please consult us for language availability.

P92MiCOM 0 1

Informations required with order:

8/12/2019 P921&P922


ALSTOM T&D Protection & Control Business contact addresses

Central and South America

ALSTOM INTERNATIONAL (PERU)Edificio Las NacionesAvenida Central 643 - Piso 1San IsidroLima 27PERUTel: +51 1 221 7954 /1208Fax: +51 1 221 [email protected]

Brazil

ALSTOM T&D LtdProtecção e ControlAvenida Interlagos 4211CEP-04661-300 São PauloSão PauloBRAZILTel: +55 11 5524 1044Fax: +55 11 5548 [email protected]

South America

ALSTOM ARGENTINA SAProtección y ControlAv. Leandro N. Alem 896 - Piso 51001 Buenos AiresARGENTINATel: +54 11 4891 9600 / 9666Fax: +54 11 4311 [email protected]

A

T

Western Europeand Africa

United Kingdom and Northen EuropeALSTOM T&D P&C LtdSt Leonards WorksStafford. ST17 4LXUNITED KINGDOMTel: +44 (0)1785 22 32 51Fax: +44 (0)1785 21 22 [email protected]

France, Belgium and Luxembourg,Mediterranean and Africa

ALSTOM T&D P&C SAvenue de Figuières

34975 Lattes CedexFRANCEel: +33 (0)4 67 20 54 54

Fax: +33 (0)4 67 20 54 [email protected]

T

Italy ALSTOM FIR S.p.AViale Giulio Cesare, 2924124 -BergamoITALYel: +39 035 5791611

Fax: +39 035 [email protected]

Spain and PortugalALSTOM T&D, S.A.Paseo de la Castellana, 257

28046 MadridSPAINTel: +34 91 334 59 43Fax: +34 91 334 59 [email protected]

Germany And Eastern Europe

Germany and SwitzerlandRussian Speaking CountriesALSTOM ENERGIETECHNIK GmbHBereich Schutz- undSchaltanlagenleittechnikLyoner Straße 44-48D 60528 Frankfurt/MainGERMANYTel: +49 69 66 32 33 33Fax: +49 69 66 32 25 [email protected]

South East EuropeALSTOM AUSTRIA AGHietzinger Kai 169A1130-ViennaAUSTRIATel: +43 1 87893 726Fax: +43 1 87893 750

[email protected]

Central EuropeALSTOM T&D P&C SAuI. Strzegomska 23/2758-160 SwiebodzicePOLANDTel: +48 74 854 84 10Fax: +48 74 854 85 [email protected]

Middle East Asiaand Pacific

Middle East AsiaALSTOM T&D P&C Ltd12th Floor, Cresent TowerBuhaira CornichePO Box 25448. SharjahUNITED ARAB EMIRATESTel: +971 6 556 3971Fax: +971 6 556 [email protected]

India and South AsiaALSTOM INDIA LtdProtection & Control Division19/1 GST Road Pallavaram WorksChennai (Madras) 600 043INDIATel: +91 44 236 8621Fax: +9144 236 [email protected]

South East AsiaALSTOM T&D P&C Ltd31 Kaki Bukit Road 3#02-05, TechlinkSingapore 417818SINGAPORETel: +65 843 3130Fax: +65 846 [email protected]

China and North East AsiaALSTOM T&D P&CRoom 910-912, 9th floorNew Kowloon plaza38 Tai kok Tsui roadKowloon, Hong KongCHINATel: +852 2833 6265Fax: +852 2834 [email protected]

Australia and Pacific IslandsALSTOM AUSTRALIA LtdProtection & Control DivisionPO Box 22, 25 Princes RoadRegents Park, NSW 2143 SydneyAUSTRALIATel: +61 29 645 0777Fax: +61 29 743 [email protected]

PCB Head Office

ALSTOM T&D P&C3 Parc des Grillons60 Route de SartrouvilleB.P. 58. 78230 Le Pecq CedexFRANCE

Tel: +33 (0)1 34 80 79 00Fax: +33 (0)1 34 80 79 [email protected]

North and South America

USA, Panama and Caribbean

ALSTOM USA INCProtection & Control Division4 Skyline DriveHawthorne

New York 10532-2160USATel: +1 914 347 5155Fax: +1 914 347 [email protected]

CanadaALSTOM CANADA INC845 Harrington CourtBurlingtonOntario L7N 3P3CANADA

Mexico

ALSTOM T&D SA DE CVAlce Blanco 13-ANaucalpan de JuarezCP 53370 Mexico CityMEXICOTel: +52 5 358 27 22Fax: +52 5 358 83 [email protected]

Tel: +1 905 333 3667Fax: +1 905 333 [email protected]

ALSTOM T&D BITRONICS INC.261 Brodhead RoadBethlehem, PA18017-8698USATel: +1 610 865 2444Fax: +1 610 865 0340

International Contact CentreOpen 24 hours a day

Tel: +44 (0)1785 25 00 70Fax: +44 (0)1785 27 24 51www.tde.alstom.com/p-c/en/contcent.htm

8/12/2019 P921&P922


Protection & Control, 60 Route de Sartrouville, BP58, 78230 Le Pecq Cedex. FranceTel: +33 (0) 134 80 79 00 Fax: +33 (0) 134 80 79 13 Email: [email protected] Internet: www.tde.alstom.com

© 2001 ALSTOM. ALSTOM, the ALSTOM logo and any alternative version thereof are trademarks and service marks of ALSTOM.MiCOM is a registered trademark of ALSTOM. Other names mentioned, registered or not, are the property of their respective companies.

Our policy is one of continuous development. Accordingly the design of our products may change at any time. Whilst every effort is made to produce up to date literature, thisbrochure should only be regarded as a guide and is intended for information purposes only. Its contents do not constitute an offer for sale or advice on the application of any product

f d t i it W t b h ld ibl f li d i i t k it t t ith t ifi d i

TRANSMISSION & DISTRIBUTION

u b l i c a t i o n : P 9 2 x / E N

B R / B b

P r i n t e d i n F r a n c e - 0

8 0 1 - M

i C O M C a t a l o g u e

- F l a s h E s p a c e

Date post:	03-Jun-2018
Category:	Documents
Upload:	sanjeevchhabra1
View:	232 times
Download:	0 times

P921&P922

Documents