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SEMINAR | May 11th, 2017
Andrea Bonetti – FMTP POWER AB [email protected]
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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