7UM511 Catalogue

7/29/2019 7UM511 Catalogue

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Generator Protection

Siemens LSA 2.5.2 . September 1996 1

Application

The 7UM511 is a numerical generatorprotection relay offering a practical combination of protection functions for generators. The device provides all the necessary protection functions for small

generators of the type used in emergency diesel generating sets or privatepower plants. The unit also serves as abasic module for more comprehensiveprotection systems based on the 7UM51series for large generators. The 7UM51protection system is supplemented bythe 7UT51 differential protection units.

The protective functions integrated in thedevice allow use of the 7UM511 as system disconnector.

Design

The compact device contains all components required for:

D

Measuredvalue acquisition and evaluation

D Operation and display

D Indication and command output

D Acquisition of binary signals

D Serial data transfer

D Auxiliary power supply.

The device can be supplied with housingsfor flush or surface mounting. The version for control panel mounting or cubiclemounting is supplied with connection terminals at the rear of the device and isavailable with or without a glass cover.The version for control panel mounting isequipped with 100 screw terminals accessible from the front.

Functions

The following protection functions areimplemented:

D Overcurrenttime protection (with undervoltage sealin)

D

Singlephase overcurrent protection(can be implemented as rotor earthfault protection)

D Stator overload protection

D Underexcitation protection

D Overvoltage protection

D Undervoltage protection

D Overfrequency protection

D Underfrequency protection

D Reverse power protection

D Forward power monitoring

D Unbalanced-load protection

D Stator earthfault protection V0>

D Direct injection (for separate protection equipment)

D Trip circuit monitoring.

Measurement method

The influence of harmonics, highfrequency transients, transient direct current components and differing CT saturation levels are suppressed to a largedegree by the use of powerful micropro

cessors and complete digital signal processing (measuredvalue acquisition,measuredvalue conditioning and measuredvalue processing).

Availability and precise measurementeven with varying frequencies are assured by automatic followup of the sampling frequency for the range 10 to 68 Hz.

Several of the integrated protection functions make use of variables that are available in the form of symmetrical components. A change in the phase sequence,as is used in reversal in pumpedstoragepower plants, must be communicated tothe 7UM511 protection device to ensurethat the symmetrical components arecorrectly formed. A binary signal inputcan be assigned this switchover function.

7UM511 Generator protection relay (version V3)

Fig. 17UM511 generator protection relay (version V3)

27

32F

32R

40

46

Scope of functions

51

51N

59

64

64R

49S 81

Siemens AG 1996e


2/12


Siemens LSA 2.5.2 . September 19962

Serial interfaces

The relay is equipped with two serial interfaces. The interface at the front is suitable for connection of an ATcompatiblePC. The program DIGSI is available as aconvenient way of making settings, evaluating fault recordings and faults, andcommissioning. The interface located atthe rear of the device is available eitheras an isolated RS 232 interface or as afibreoptic interface. It is intended for useeither as a system interface for connection to the SINAUT LSA substation control and protection system to a centralprotection data unit (protocol according toVDEW/ZVEI recommended), or as an operator interface for connecting a PC.

Settings

All setting parameters are entered withmenu guidance via the integrated operator and display panel or a PC. They arewritten to a nonvolatile memory so thatthey are not lost even if the supply voltage is interrupted.

Selfmonitoring

All important components such as thehardware and software are continuouslymonitored and any irregularities in thehardware or in the program sequence aredetected and signalled. This significantlyimproves the reliability and availability of

the protection system.

Overcurrenttime protection (ANSI 51)

This protection function comprises twostages. The first stage generally servesas shortcircuit and backup protection forupstream relays such as differentialprotection and distance protection.

An undervoltage stage maintains the excitation when the current falls below thestarting threshold and at the same timethe voltage drops because the excitationsystem can no longer be sufficiently supplied.

The second stage can be implemented,for example, as a highspeed stage forlowvoltage generators or for constantvoltage generators.

Singlephase overcurrenttime protection (ANSI 51N or ANSI 64R)

This singlephase overcurrent protectioncan be implemented as a stator earthfault protection. This function detects theearthfault current limited by an impedance.

This protection system is so sensitivethat it can also be used as a rotor earthfault protection with the relevant accessories. A measuringcircuit monitoringfunction is available for this application.

Stator overload protection (ANSI 49)

The task of the overload protection is toprotect the stator windings from high,continuous overload currents. All loadcycles are evaluated by the mathematicalmodel used. The thermal effect of theeffective current value forms the basis ofthe calculation. The ambient temperatureor the temperature of the coolant can beinjected as a proportional voltage toachieve adaptation to the prevailingconditions; otherwise a constant ambienttemperature is assumed. By monitoringthe minimum voltage, a wire break at theinput for the temperature injection is de

tected. If this input is suitably connected,4 mA to 20 mA transducers can also beused for temperature acquisition.


Fig. 2Calculation of temperature from the phase currents according to the mathematical model

t

0.83

11.1

1

Trip threshold with setting I/IN = 1.1

I/IN/ trip

I

Fig. 3Admittance diagram with the response characteristics for the static and dynamic stability limit

1

R

1

X

l2

l1=

1st char

acteris

tic

2nd characteris

tic

a3

a2 a1

S

E

V

V

1

xd

Angular

linear 3

Angular

linear 2

Angular

linear 1

l3

I


3/12



Underexcitation protection (ANSI 40)

The load angle is calculated as the complex admittance derived from the generator terminal voltage and current. Thisprotection prevents damage due to lossof synchronism resulting from underexcitation. The protection function providestwo characteristics for monitoring staticand dynamic stability. Monitoring of theexciter voltage ensures fast response ofthe protection on exciter failure.

The positive sequence systems of current and voltage are used to calculate thevariables. This ensures that the protection always operates correctly even withasymmetrical network conditions.

Overvoltage protection (ANSI 59)This protection prevents insulation faultsthat result when the voltage is too high.The protection function uses the positivesequence components of the voltagesand is therefore independent of the neutral point displacement caused by earthfaults. This protection function is implemented in two stages.

Undervoltage protection (ANSI 27)

Undervoltage protection compares thepositivesequence components of thevoltages with a lower limit value. Thisfunction is used for asynchronous machines and pumpedstorage sets and pre

vents the voltagerelated instability ofsuch machines.

Frequency protection (ANSI 81)

The 7UM511 protection relay includes afourstage frequency protection. Eachstage can be implemented either as anoverfrequency or underfrequency protection. The complicated algorithm successfully filters out the fundamental wavesand determines the frequency extremelyprecisely even if the voltage is distorted.

Reverse power protection (ANSI 32)

The reverse power protection monitors

the direction of power flow and respondswhen the mechanical energy fails because then the drive energy is taken fromthe network. This function provided bythe 7UM511 can be used for operationalshutdown of the generator but also prevents damage to the steam turbines. Thereverse power is calculated from the positivesequence systems of current andvoltage. Asymmetrical network faults donot therefore cause reduced measuringaccuracy. The position of the emergencytrip valve is injected as binary informationand is used to switch between twoswitchoff command delays.

Forward powermonitoring (ANSI 32)

Monitoring of the power produced by agenerator can be useful for starting upand shutting down generators. One stagemonitors violation beyond one limit valuewhile another stage monitors violationbelow another limit value. The power iscalculated using the positivesequencecomponent of current and voltage.

Unbalanced-load protection (ANSI 46)

Asymmetrical current loads in the threephases of a generator cause a temperature rise in the rotor because of the reverse field produced.

This protection detects an asymmetricalload in threephase machines. It functions on the basis of symmetrical components and evaluates the negative phasesequence system of the phase currents.The thermal processes are represented ina mathematical model. Warning and triggering stages that can be set separatelycompare the calculated overtemperatureagainst relevant threshold values. In addi

tion, the load unbalance is evaluated byan independent stage which is supplemented by a timedelay element.

Stator earthfault protection (ANSI 64)

Earth faults manifest themselves in generators that are operated in isolation bythe occurrence of a displacement voltagein the generator neutral point which isequivalent to a zerophase sequence system in the phasetoearth voltage.

The 7UM511 protection relay calculatesthe zerophase system of the phasetoearth voltage and compares the resultingdisplacement voltage with a settable

limiting value. This provides earthfaultprotection for up to 95% of the statorwinding.

Direct injection

Direct injection of the 7UM511 protectionrelay is a function used for the acquisitionof digital information. This digital information is entered in the fault indicationmemory. They can influence the LEDsalarm relay" and command relay".Each direct injection" can delay the effect of the digital information with an in

dividual timer. The function direct injection" is used to process information fromthe Buchholz protection or machine commands.

Trip circuit monitoring

The 7UM511 protection relay can monitortwo trip circuits (circuitbreaker coils including supply conductor) for correctfunctioning. If a fault is detected in themonitored circuits the protection relayoutputs an indication.

Status measurements

The values acquired and calculated by thedevice such as primary and secondary

conductor current and voltage, earth current, neutral voltage, positivesequencecomponents of active and reactivepower, frequency, active power, reactivepower, power factor, currentvoltageangle, rotor displacement angle, excitervoltage, calculated conductorrelatedovertemperature, coolant temperature,negative phasesequence components ofthe phase currents, overtemperature resulting from load unbalance and thedirection of rotating field can be displayedon the LC display or on a PC.


Fig. 4Trip range of the load unbalance protection

Unbalance

warning stage I2>

Thermal trip

stage

Thermal

warning stage

t

TWARN

T>>TRIP

I2perm I2>> I2

Unbalance trip

stage I2>>


4/12



Fault recording

Depending on the parameters set, eitherrecording of current (display of input variables) or rms values (one value for eachperiod) is implemented in the protectionrelay. The maximum duration of time during which faults are recorded depends onthe recording frequency. Several faultscan be recorded (max. 8) in a memoryone after the other. This number whichcan be set also depends on the numberof faults. The lead time and overtraveltime and triggering event (start of faultrecording with activation and triggering)can be set to meet different demands.The recorded fault data can be transferred either to the SINAUT LSA substation control and protection or to a PC

where they are then analysed.

Trip matrix/trip circuits

The device is equipped with five trip relays. These can be arbitrarily assigned tothe protection functions described aboveby parameterization (software matrix).Furthermore, each protection functioncan be switched ON" or OFF" via theoperator panel. A third blocked" positionpermits commissioning of the unit withthe local indications and the alarm relaycircuits operative, but without trippingthe circuitbreakers. With the many parameterized possibilities provided, testingof and alterations to the circuitbreakeroperation can be performed during commissioning, as well as during normal operation without the need for rewiring.

Indication memory

The device provides detailed data for analysing faults and checking operatingstates. All the indication memories listedbelow are protected against power supply loss.

D TimeA batterybacked clock is provided asstandard and synchronized via a binaryinput or system interface. All indications are assigned a time and date.

D Fault indicationsThe indications of the last three faultsare can be accessed at any time.

D Operational indicationsAll indications that are not directly connected to a fault are stored in the op

erational indication memory.

Assignable alarm relays, LEDs andbinary inputs

Alarm relays and LEDs can be freely assigned by the user to provide userspecific output and display of indications.The LED displays are protected againstloss of power.

All binary inputs are also freely assignable and each input can be assigned toseveral logical inputs.



5/12



Technical data

Input circuits Rated currentRated voltage, can be parameterized

Rated frequency, can be parameterized

Thermal overload capabilityin voltage path, continuous

in current path, continuous

v1 s

v10 s

in earthfault path, continuous

v1 s

v10 s

DC inputs

Power consumptionin voltage path at VN = 100 V

i n c ur ren t p at h at IN = 1 Aat IN = 5 A

1 o r 5 A100 to 125 V AC

50/60 Hz

140 V AC

4x IN

100 x IN

20 x IN

15 A

300 A

100 A

60 V DC

Trip delay, reset delay

Resetting ratio

Response time

Undervoltage sealin V

Trip delay, reset delayReset ratio

Response time

Measuring circuit monitoring current IE, V>>


Reset ratio

Response time

30 to 180V

0 t o 32 s

0.95

approx. 50 ms

Undervoltage protection (ANSI 27) Voltage V> (referred toIN)

Reset ratio


Response time of the independent characteristic

3 t o 3 0 %

0 t o 32 s

100 to 2500 s

70 to 99 %

10 to 80 %

0.95

0 t o 32 s

approx. 50 ms

Stator earthfault protection(ANSI 59N)

Displacement voltage

Reset ratio


Response time

5to 100 V

0.7

0 t o 32 s

approx. 50 ms

Direct injection Number

Trigger delay t1, t2, t3, t4

Reset delay t1, t2, t3, t4

Response time

4

0 t o 32 s

0 t o 32 s


7/12



Technical data(cont.)

Contacts Potentialfree trip contactsSwitching capacity Make

Break

Permissible current Continuous0.5 s

Switching voltage

Alarm contacts

Switchingcapacity Make/break

Permissible current

Switching voltage

3x 2 S, 2 x 1 S (total of 5 trip relays)1000 W or VA30 Wor VA

5 A30 A

250A DC

13

20 Wor VA

1 A

250 V DC

Displays, signal inputs LED displays at the front of the device

Optocoupler 24 to 250 V DC

Current consumption independent of voltage range

16

8

approx. 2.5 mA

Design of device For panel surface mountingWeight

For panel flush mounting/cubicle mountingWeight

Degree of protection to EN 60 529

In housing 7XP2040-1approx. 12 kg

In housing 7XP2040-2approx. 10.5 kg

IP 51

CE conformity, regulations This product is in conformity with the directive of the Council ofthe European Communities onthe approximation ofthe laws ofthe Member States relating to the electromagnetic compatibility(EMC Council Directive 89/336/EEC).The product conforms with the international standard IEC 255 andthe national standard DIN VDE 57 435/part 303.

The relay is designed for use in an industrial environment, forinstallation in standard relay rooms and compartments so thatwith proper installation electro-magnetic compatibility (EMC) isensured.

Conformity is proved by tests performedby Siemens AG in line with article 10 ofthe Council Directive in accordance withthe generic standards EN 50081-2 andEN 50082-2.

Insulation tests

IEC 255-5, DIN VDE 0435 Part 303

Voltage test (routine test), all circuits excluding auxiliary voltage

Voltage test (routine test), auxiliary voltage only

Impulse voltage test (type test), all circuits, class III

2 kV (rms value), 50 Hz

2.8 kV DC

5 kV (peak value), 1.2/50 ms, 0.5 J,

3 positive and 3 negativeimpulses in intervals of 5 s

EMC tests fornoise immunity

(Type tests)Standards: IEC 255-22 (product standard)

EN 50082-2 (basic specification)DIN VDE 0435 Part 303

High frequency testIEC 255-22-1, Class III and DIN VDE 0435 Part 303, Class III

Electrostatic discharge testIEC 255-22-2, Class III and EN 61000-4-2, Class III

Radiation with high frequency field, unmodulatedIEC 255-22-3 (Report), Class III

Radiation with high frequency field, amplitude modulatedEN 61000-4-3

Radiation with high frequency field, pulse modulatedENV 50204 / EN 61000-4-3

Fast transient interference/burstIEC 255-22-4 and EN 61000-4-4, Class III

Conducted HF, amplitude modulatedEN 61000-4-6

Magnetic field with highvoltage equipment frequencyEN 61000-4-8, Class IV

2.5 kV (peak value), 1 MHz, t = 15 ms,400 impulses per s, length of test 2 s

4 kV/6 kV contact discharge, 8 kV air discharge, both polarities, 150 pF,Rl = 330 W

10 V/m, 27 to 500 MHz

10 V/m, 80 to 1000 MHz, AM 80 %,1 kHz

10 V/m, 900 MHz, repetition frequency200 Hz, duty cycle 50 %

2 kV, 5/50 ns, 5 kHz, burst length = 15 ms,Repetition rate 300 ms, both polarities,Rl = 50 W, duration of test 1 min

10 V, 150 kHz to 80 MHz, AM 80 %,1 kHz

30 A/m continuous, 300 A/m fr 3 s, 50 Hz

EMC tests for emitted interference

(Type tests)Standards: EN 50081-2 (basic specification)

Radio interference voltage on lines, auxiliary voltage onlyCISPR 11, EN 55011, limit value class A andDIN VDE 0875 Part 11, limit value class A

Interference field strengthCISPR II, EN 55011, limit value class A andDIN VDE 0875 Part 11, limit value class A

150 kHz to 30 MHz

30 to 1000 MHz

Climatic conditions Permissibleambient temperature during operationduring storageduring transport

Humidity class

-5 to +55 C-25 to +55 C-25 to +70 C

Annual averagev75 % relative humidity,on 30 days per year up to 95 % relativehumidity, condensation not permissible

Mechanical stress testsIEC 255-21-1, IEC 68-2 Pe rmi ssi bl e me ch an ic al st re ss d ur ing o per at ionduring transport10 to 60 Hz, 0.035 mm amplitude60 to 500 Hz, 0.5 g acceleration

5 to 8 Hz, 7.5 mm amplitude8to 500 Hz, 2 g acceleration



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Selection and ordering data

Order No.7UM511 generator protection relay (V3) 7UM511 j - jj B 0 1 - 0 j B 0

Rated current at 50 to 60 Hz, 100 to 125 V AC

1 A5 A

15

Rated auxiliary voltage

24, 48 V DC60, 110, 125 V DC220, 250 V DC

245

Construction

For panel flush mounting/cabinet mountingFor panel surface mountingFor panel flush mounting or cabinet mounting, without glass cover

CDE

Rear, serial interface (suitable for substation control and protection and DIGSI operating program)

ElectricalFibreoptic

BC

Accessories

Rotor earthfault protection

Ballast 100/45 V A C (W x H x D in mm) 135 x 170 x 85Coupling device 2 x 4 mF 196 x 300 x 110Series resistor 196 x 300 x 146

7XR8500-07XR60003PP1336-0DZ013002

Operation

DIGSI program (suitable for all 7UM..., 7UT..., 7SJ..., 7SA..., ... protection relays) GermanEnglish

Test version: GermanEnglish

Connecting cable protection relay (25pin) - PC (9pin); (other versions available on request)

7XS5020-0AA007XS5020-1AA00

7XS5021-0AA007XS5021-1AA00

7XV5100-2

Documentation

German

Katalogblatt LSA 2.5.2: Maschinenschutz 7UM511 (Version V3)H an db uc h: Ma sc hi nen sc hu tz 7 UM51 1 ( Ver si on V 3)

E50001-K5752-A121-A2C53000-G1100-C109-1

English

CatalogLSA 2.5.2: 7UM511 Generator protection relay (Version V3)Ma nu al : 7 UM5 11 G ene rat or p ro tec ti on r ela y ( Ve rs ion V 3)

E50001-K5752-A121-A2-7600C53000-G1176-C109-1



9/12




Fig. 5Connection diagram of the 7UM511 generator protection relay (version V3)

Overcurrent

>

Overcurrent

>>

Overcurrent

>

Underfrequency

Block

Emerg.

Tripcontact

Excitervoltagemissing

isecload

VL1

VL2

VL3

VN

.../

100V

Yy0

G

IL1

IL2

IL3

IN

Iload

Exciter

Binaryinputs,

alarmrelays,

commandrelays.

LEDs

canbemarshalled

L1

L2

L3

7

B1

8

B1

6

B1

7

B2

8

B2

6

B2

7

B3

8

B3

6

B3

7

B4

8

B4

6

B4

3

D1

4

D1

3

D2

4

D2

3

D3

4

D3

3

D4

4

D4

3

C1

4

C1

3

C2

4

C2

3

C3

4

C3

3

C4

4

C4

6

A3

6

A1

6

A2

5

B1

5

B3

5

B4

5

B2

5

A1

5

A3

5

A4

5

A2

6

D1

6

D3

6

D4

6

D2

5

D1

5

D2

5

D3

5

D4

4

A3

4

A4

65

64

63

68

67

66

71

70

69

86

85

84

87

88

89

90

91

92

93

94

95

96

43

44

45

46

47

48

19

18

17

74

99

100

75

72

97

98

73

20

22

23

21

24

25

49

50

76

77

7UM511

Alarmrelay1

input1

Faultalarm

relay

Binary

Binary

input2

Binary

input3

Binary

input4

Binary

input5

input8

Binary

input7

Binary

input6

Binary

Versionforpanelsurfacemounting

Versionforpanelflushmounting/cabinetmounting

L+

L-L+ L

-L+

L-L+

L+

TxD

MT

9

3B1

13

2B1

10

3B2

11

3B3

31

2B3

1

3A1

5

3A2

2

2A1

6

2A2

3

1A1

7

1A2

4

1D1

8

1D2

53

8A2

54

8A1

56

8A3

57

7A2

58

7A1

59

7A4

60

7A3

61

8D2

62

8D1

78

8D4

79

8D3

80

7D2

81

7D1

82

7D4

83

7D3

37

2C1

38

2C2

39

2C3

40

2C4

15

4B1

L+

16

4B2

L-

51

4A1

52

4A2

14

2B2

RxD

MR

VL1

VL2

VL3

V

N

IL1

IL2

IL3

IN

Pt100amplifier

Powersupply

Vexcit.

Alarmrelay2

Alarmrelay3

Alarmrelay6

Alarmrelay5

Alarmrelay4

Alarmrelay11

Alarmrelay8

Alarmrelay7

Alarmrelay10

Alarmrelay12

Alarmrelay9

Command

relay1

Command

relay2

Command

relay3

Command

relay4

Command

relay5

RS232interface,

2kV-

isolatedlink

tocentralequipment

Fibreopticinterfacelinkto

centralequipment

f

/

/

Pr

Pr

/_

/

Pr

Returnpower

withPP

/_

/

Pr

VI

f

I

IE

(sensitive)

Injection1

L+

Injection2

1

L-

Blocking

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7UM511 Catalogue

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