Protection Relay for Feeder, Grid and Generator Applications

Protection Technology made simple

ApplicationThe MRA4 is a protection relay which uses the latest Dual-Core-Processor Technology to provide precise and re-liable protective functions and is very easy to operate. Its various protective functions are specifically tailored to the protection of incoming and out-going feeders in MV systems. It also can be used for grid and generator protection. All inclusive:

All protection features without • extra charge

Parameter setting and • evaluation software

Disturbance record analysis • software

Six stages phase overcurrent protection

Directional and non-directional • overcurrent/short-circuit protection

Tripping characteristics: • DEFT ANSI: NINV, VINV, EINV IEC: NINV, VINV, LINV, EINV Thermal Flat, IT, I2T, I4T

Voltage controlled•

Disturbance recorder120 s non volatile, •

32 samples per cycles

Additional highlightsAutomatic reclosing•Inrush•Thermal replica•Four stages external protection•Plausibility checks•Adaptive parameter sets•Energy counters•Status display•Comprehensive measured values •

and statisticsMasking of unused functions•

Parameter setting support by software

Copy parameter sets•Compare parameter sets•Setting files are up and down •

convertible (across versions)

Comprehensive frequency protection packageEach of the six stages can be used as:

f< or f> (over- and • underfrequency supervision)

df/dt (ROCOF) • Rate of change of frequency

(f< and df/dt) or (f> and df/dt) • combination of over-, under- and rate of change of frequency (ROCOF)

(f< and DF/DT) or (f> and DF/DT) • combination of over-, under- and increase of frequency

Delta Phi (Vector surge)•

Power protection packageSix stages power protection •

Each can be used as P>, P<, Pr, Q>, Q<, Qr, S>, S<

Two stages power factor (PF)•

SupervisionCurrent transformer supervision•Voltage transformer supervision•Circuit breaker failure protection•Trip circuit supervision•Cold load pickup•Switch onto fault•

HighPROTEC

MRA4

Four stages earth fault protectionDirectional and non-directional •

earth fault protectionTripping characteristic: •

DEFT ANSI: NINV, VINV, EINV IEC: NINV, VINV, LINV, EINV Thermal Flat, IT, I2T, I4T

Voltage controlled•

Two stages unbalanced load protection

Supervision by definite time or • tripping characteristic

Four stages voltage protectionUnder- and overvoltage•Programmable undervoltage •

time depending characteristic

Two stages residual voltage protection

VE>•

Six stages voltage asymmetry supervision

Under- and overvoltage in • positive phase sequence system, overvoltage in negative phase sequence system

Functional Overview

PrOTeCTive FunCTiOnS elements AnSi

I, time overcurrent and short circuit protection, all stages can be configured for directional or non-direc-tional supervision. Tremendous reset options (instantaneous, definite time, reset characteristics accor-ding to IEC and ANSI). Voltage controlled overcurrent protection by means of adaptive parameters.

6 6

50P, 51P, 67P

51V

I2>, unbalanced load protection with evaluation of the negative phase sequence currents 2 46

IB, overload protection with thermal replica and separate pick-up values for alarm and trip functions 1 49

IH2/In, inrush detection with evaluation of the 2nd harmonic 1 Inrush

IE, earth overcurrent and short circuit protection, all stages can be configured for directional or non-directional supervision. Tremendous reset options (instantaneous, definite time, reset characteristics according to IEC and ANSI). Voltage controlled overcurrent protection by means of adaptive parameters.

4 4

50N,51N, 67N

51V

V<, V>, V(t)<, under- and overvoltage protection, time dependent undervoltage protection 4 27, 59

Voltage asymmetry supervision (V012)V1, under and overvoltage in positive phase sequence systemV2, overvoltage in negative phase sequence system

6 47

Each of the six frequency protection stages can be used as: 6

f< or f> (over- and under frequency supervision)• 81U/O

df/dt rate of change of frequency (ROCOF)• 81R

(f< and df/dt) or (f> and df/dt) combination of over-, under- and rate of change of frequency (ROCOF) •

(f< and DF/DT) or (f> and DF/DT) • combination of over-, under- and increase of frequency

Delta Phi (Vector surge)• 78

VE, residual voltage protection 2 59N

AR, automatic reclosing 1 79

ExP, External alarm and trip functions 4

PQS, Power protection 6 32, 37

PF, Power factor 2 55

SuPerviSiOn FunCTiOnS elements AnSi

CBF, circuit breaker failure protection 1 50BF

TCS, trip circuit supervision 1 74TC

VTS, voltage transformer supervision by comparing phase and residual voltages 1 60FL

VTS, fuse failure protection via digital input 1 60FL

CTS, current transformer supervision 1 60L

CLPU, cold load pickup 1

SOTF, switch onto fault 1

Non volatile event recorder up to 120 s with 32 samples per cycles

3

1

4

MRA4

50BF

60FL27

Fault recorder

Event recorder

Disturbance recorder

V, VE, V012, I, IG, f, delta phi, theta , IH2,

IGH2, I012, P, Q, S, PF, cos phi, W

Measured and calculated values49 51P 67P50P46

81 U/O

67N79 Inrush

59 59N 50N 51N

74TC

7881R

37

32 60L 55

SOTF CLPU

47

51V

Functional overview in AnSi form

Connections

Current inputs 4 (1 A and 5 A) with automatic short circuitersvoltage inputs 4 (0 - 800 V)Digital inputs Switching thresholds adjustable via softwarePower supply Wide range power supplyTerminals All terminals plug typeMounting Door mountingType of enclosure IP54Dimensions of housing 212.7 mm x 173 mm x 209 mm (W x H x D)Weight (max. components) approx. 4 kg

Woodward SEG GmbH & Co. KGKrefelder Weg 47

D - 47906 Kempen

Sales TeamPhone: +49 (0) 21 52 1 45 - 1

Fax.: +49 (0) 21 52 1 45 - 3 54e-mail: kemp.electronics@woodward.com

ServiceTelefon: +49 (0) 21 52 1 45 - 6 14/3 34

Fax.: +49 (0) 21 52 1 45 - 4 55e-mail: kemp.pd@woodward.com

Visit us at www.eps.woodward.com DO

K_FL

Y_M

RA4_

04.0

9_EN

Enabling Electrical Power Systems Integration

Order form MrA4

Directional Feeder Protection MrA4

Digital Inputs

Binary out-put relay Housing Large

display

816

713

B2B2

--

AD

Hardware variant 2Standard

0

Housing and mountingDoor mountingDoor mounting 19“ (flush mounting)

A B

Communication protocolProtocol/without protocol RS485/terminals, Modbus RTU, IEC60870-5-103 Ethernet (RJ45), Modbus TCP, IEC61850* prepared (Hardware/Interface) Optic fiber, Modbus RTU, IEC60870-5-103 RS485/D-SUB, Profibus**, Modbus RTU, IEC60870-5-103

A B C F G

Presetting of available menu languagesStandard English/German

* Additional cost for the software update tool IEC61850 per device are 250 €. The devices can be updated via device front interface (RS232) and PC locallyExpected availability: 01.01.2010**expected 07.09