发明名称 |
PROTECTIVE RELAY SYSTEM WITH SPACIAL DIFFERENCE FILTER AND SUMMING FILTER |
摘要 |
A protective relay system which judges whether or not the fault section of a power system exists within a perscribed extent is constituted of a first spacial difference filter having a transfer function (Z<-k>-Z<-q>) in which the inputs are the voltage vm and the current im at sampling time tm of the power system, and the outputs are a voltage vsm and a current ism, a second spacial difference filter having a transfer function, (1+Z<-1>+Z<-2>+ ... +Z<-n>)(1+Z<-1>) in which the outputs are a voltage vjm and a current ijm, a controlled variable calculating means which calculates the reactance value Xm based on a formula, Xm=(-vsm.ism-p+ism.vsm-p)/(-ijm.ism-p+ijm-p.ism) (where, the voltage vsm-p, the current ism-p, the voltage vjm-p and the current ijm-p respectively represent the outputs of the first and second spacial difference filters at time tm-p), and an operation judging means which judges whether or not the reactance Xm is equal to or smaller than a set value Xs.
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申请公布号 |
WO9601515(A1) |
申请公布日期 |
1996.01.18 |
申请号 |
WO1995JP01297 |
申请日期 |
1995.06.29 |
申请人 |
KABUSHIKI KAISHA TOSHIBA;MAEDA, TAKAFUMI;YAMAKAWA, HIROSHI;ANDOW, FUMIO;YAMAURA, MITSURU;KUROSAWA, YASUHIRO |
发明人 |
MAEDA, TAKAFUMI;YAMAKAWA, HIROSHI;ANDOW, FUMIO;YAMAURA, MITSURU;KUROSAWA, YASUHIRO |
分类号 |
H02H3/40;H02H3/44;(IPC1-7):H02H3/44;H02H3/38 |
主分类号 |
H02H3/40 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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