alstom dpsp 0090 (arial) v1
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8/2/2019 Alstom DPSP 0090 (Arial) v1
1/13
Oleg BAGLEYBTER
Sankara SUBRAMANIAN
ENHANCING DIFFERENTIAL PROTECTIONSTABILITY DURING CT SATURATION WITH
TRANSIENT BIAS
GRID
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8/2/2019 Alstom DPSP 0090 (Arial) v1
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ALSTOM 2010. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subjectto change without notice. No representation or warranty is given or to be implied as to the completeness of information or fitness for any particularpurpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Preventing CT saturation
IEEE Guide for the Application of Current TransformersUsed for Protective Relaying Purposes. IEEE Std
C37.110-2007.
..1
)1(
up
s
x
REM
RXRIV
+>
Westinghouse equation
Remanent flux up to 80%X/R = 20 (typical transmission)
=
> RIRIV ss
x 1058.0121
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8/2/2019 Alstom DPSP 0090 (Arial) v1
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ALSTOM 2010. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subjectto change without notice. No representation or warranty is given or to be implied as to the completeness of information or fitness for any particularpurpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Simple Transient Bias
Decaying
( ) )()()( ... nInISLOPEnI BIASTRBIASTHRDIFF +=
)()1()( .. nISnIDnI BIASBIASTRBIASTR +=
Incrementing
0)( > nIBIASIf
!!!OPERATING TIME FOR INTERNAL FAULTS!!!
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8/2/2019 Alstom DPSP 0090 (Arial) v1
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ALSTOM 2010. All rights reserved. Information contained in this document is provided without liability for information purposes only and is subjectto change without notice. No representation or warranty is given or to be implied as to the completeness of information or fitness for any particularpurpose. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited.
Transient Bias with External Fault Detector
)()1()( .. nISnIDnI BIASBIASTRBIASTR +=
)1()( .. = nIDnI BIASTRBIASTR
1SI
2SIBIAS
IBias current
DIFFI
1
K
2K
[ ])(),( nInI DIFFBIAS
[ ])(),( nInI DIFFBIAS
[ ])1(),1( nInI DIFFBIAS
External fault
Internal fault or
CT saturation
2KR >
2KR
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8/2/2019 Alstom DPSP 0090 (Arial) v1
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www.alstom.com
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