Design of a PMU-based Adaptive Protection Relay for EHV Double-Circuit Transmission Lines
Date Issued
2000-07-31
Date
2000-07-31
Author(s)
DOI
892212E002083
Abstract
This paper presents an adaptive relay for EHV doublecircuit
transmission lines based on Phasor Measurement Units
(PMUs). Decoupling the synchronized voltage and current
phasors by modal transformation, two novel and composite fault
discrimination and location indices are derived. The proposed
relay scheme utilizing indices M and D is described. To
overcome the effects of line parameter uncertainties on the
performance of the fault location and discrimination, a line
parameter estimation algorithm is also developed. Extensive
simulation studies using EMTP/ATP have verified that the
accuracy of fault location estimation achieved can be even up to
99.9 % for most simulated cases. The designed relay is very fast
and response time almost remained well within 6 milliseconds for
most fault events. The security and reliability of the proposed
relaying scheme can achieve even up to 99.99 % and 98.36 %,
respectively.
Subjects
Phasor Measurement Unit (PMU)
Protection Relay
Fault Location
Publisher
臺北市：國立臺灣大學電機工程學系暨研究所
Type
report
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