SEMINAR | May 11th, 2017

Andrea Bonetti – FMTP POWER AB andrea.bonetti@fmtppower.com

Relay Protection Applications, Real Time Power System Simulation Tests

IEC 60255-1xx Standards

2013: IEC 1906 Award for the work on Distance Protection Standard

TC 95 – MT4 (Maintenance Team 4)

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PUBLISHED STANDARDS BY TC 95 – MT4

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STANDARDS ON THEIR WAY TO GET APPROVED 2017/2018

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CLOSE LOOK AT IEC 60255-121: DISTANCE PROTECTION

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WHY?

DISTANCE PROTECTION CHARACTERISTIC… BEFORE

DISTANCE PROTECTION CHARACTERISTIC… IEC 60255-121

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DISTANCE PROTECTION CHARACTERISTIC… IEC 60255-121

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DISTANCE PROTECTION CHARACTERISTIC… IEC 60255-121

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DEFINITION OF OPERATE TIME AND TYPICAL OPERATE TIME

DEFINITION OF OPERATE TIME AND TYPICAL OPERATE TIME

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DO WE HAVE TOOLS TO PERFORM THE REQUIRED TESTS?

SIR Diagrams

DO WE HAVE TOOLS TO PERFORM THE REQUIRED TESTS?

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HARMONICS DURING FAULTS

CVT-SIR DIAGRAMS

DO WE HAVE TOOLS TO PERFORM THE REQUIRED TESTS?

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PLEASE DO NOT FORGET…

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DOUBLE INFEED TESTS

DOUBLE INFEED TESTS

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DOUBLE INFEED TESTS

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DOUBLE INFEED TESTS

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CT REQUIREMENTS

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CT REQUIREMENTS

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CT REQUIREMENTS

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If is the maximum primary steady-state short-circuit CT current for the considered fault case

Ipr is the CT rated primary currentIsr is the CT rated secondary currentKtot is the total over-dimensioning factor (including

the transient dimensioning factor and the remanence dimensioning factor)

Rct is the CT secondary winding resistanceRba is the total resistive burden, including the

secondary wires and all relays in the circuit.

f

alreq tot sr ct ba

pr

IE K I R R

I

Provided by the relay manufacturer

CT Dimensioning

CT Dimensioning

Application

Application

CT REQUIREMENTS

CT REQUIREMENTS … BEFORE

CONCLUSION

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