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Transformer Differential Protection Relay
Protection Technologymade simple
ApplicationThe MRDT4 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 two winding trans-formers and offers in addition to that various overcurrent backup protec-tion functions.
All inclusive:All protection features without •
extra chargeParameter setting and •
evaluation softwareDisturbance record analysis•
software
two stages transformer differen-tial protection
Stabilized tripping characteristic, • transients and C.T. saturation (temporarily restraint)
Various selectable transformer • groups
Disturbance recorder120 s non volatile,•
32 samples per cycles event recorder
300 events• Last 50 non volatile•
Additional highlightsInrush• Thermal replica• Four stages external protection• Plausibility checks• Adaptive parameter sets• Status display• Masking of unused functions• Commissioning support (forcing •
and disarming relays)
comprehensive measured values and statistics
THD (total harmonic distortion)• Current phasors and angles• RMS and fundamental•
iriG-B00XTime accuracy of ±1ms• All time synchronization •
formats (IRIG-B000 ... B007)36 UTC Time Zones• Transmission of up to 18 synchro- •
nized control commands
temperature protectionBuchholz (sudden pressure), ext. •
oil temperature, and aux. tem- perature protection via digital input
Parameter setting support by software
Copy parameter sets• Compare parameter sets• Setting files are up and down •
convertible (across versions)
supervisionCurrent transformer supervision• Circuit breaker failure protection• Trip circuit supervision• Cold load pickup• Switch onto fault•
HighPROTEC
MRDT4
C.T. missmatch correction• Autom. magnitude and phase •
compensationZero sequence removal• High set element (unrestraint)•
two stages ground differential protection
Three point slope characteristic• High set element (non-restraint)•
Four stages (Backup Protection)Overcurrent/short-circuit •
protection (non-directional)Earth fault protection•
(non-directional)Tripping characteristics: •
DEFT ANSI: NINV, VINV, EINV IEC: NINV, VINV, LINV, EINV Thermal Flat, IT, I2T, I4T
two stages unbalanced load protection
Supervision by definite time or • tripping characteristic
Functional Overview
PrOtective FunctiOns elements Ansi
Transformer differential protection (2 windings), Id>, Id>>, Curve with zero point and two settable slopes and short circuit differential threshold Id>>, voltage ratio between primary and secondary setable, Inrush stabilisation / detection 2 harmonics
2
87T
Restricted earth fault IdE>, IdE>>, characteristics similar to 87T 2 87G (64REF)
I, time overcurrent and short circuit protection (non-directional). Tremendous reset options (instantaneous, definite time, reset characteristics according to IEC and ANSI).
4 50P, 51P
I2>, unbalanced load protection with evaluation of the negative phase sequence currents 2 46
IB, overload protection with thermal replica for transformers IEC60255-8, alarm and trip threshold 1 49T
IH2/In, inrush detection with evaluation of the 2nd harmonic 1 Inrush
IE, earth overcurrent and short circuit protection (non-directional). Tremendous reset options (instantaneous, definite time, reset characteristics according to IEC and ANSI).
4 50N, 51N
ExP, External alarm and trip functions 4
suPervisiOn FunctiOns elements Ansi
CBF, circuit breaker failure protection for both circuit breakers 2 50BF
TCS, trip circuit supervision 1 74TC
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
connections
Fault recorder
Event recorder
Disturbance recorder
Current Max/Min/AvgTHD Current
Current PhasorsSequence Currents
Diff CurrentsHarmonic Currents
Metering
W174TC
W186
W1Inrush
W150
W151
W146
W1 or W2CLPU
W274TC
W286
W2Inrush
W250
W251
W246
W1 or W2SOTF
W150N
W151N
W187N
W250N
W251N
W287N
87T64REF
49
W150BF
W250BF
URTD
inte
rfac
e
Bre
aker
Wea
r (2
elem
ents
)
RTD Prot
IRIG
Com
m In
terf
ace(
s)+P
roto
cols
MRDT4 Typical Configuration
3 3
Winding Side 1 Winding Side 2
Functional overview in Ansi form
current inputs 4 (1 A and 5 A) with automatic short circuitersDigital 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: [email protected]
ServiceTelefon: +49 (0) 21 52 1 45 - 6 14/3 34
Fax.: +49 (0) 21 52 1 45 - 4 55e-mail: [email protected]
Visit us at www.eps.woodward.com DO
K_FL
Y_M
RDT4
_12.
09_E
N
Enabling Electrical Power Systems Integration
Order form MrDt4
non-directional transformer Differential Protection MrDt4
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)
AB
Communication protocolWithout protocolRS485/terminals, Modbus RTU, IEC60870-5-103Modbus TCP, IEC61850 prepared (Hardware interface)/Ethernet 100 MB/RJ45 connectorProfibus-DP, optic fibreProfibus-DP, RS485/D-SUBOptic fiber, Modbus RTU, IEC60870-5-103RS485/D-SUB, Modbus RTU, IEC60870-5-103
ABc
DeFG
Presetting of available menu languagesStandard English/German
The devices can be updated via device front interface (RS232) and PC locally
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