線路の一方の端部からの電流及び電圧の測定値を使用する障害位置選定

Japanese Patent JP2006505768

A

A method to locate a fault from one end of a section of a power line utilizing measurements of current, voltage and angles between the phases at a first end of said section. Symmetrical components of currents are calculated for the current and voltage measurement at the first end. A value of impedance is calculated for an extra link between the terminals with the impedance for the positive sequence equal to: $\left({\underset{\_}{Z}}_{1\mathrm{LB}\&\mathrm{AB}}=\frac{{\underset{\_}{Z}}_{1\mathrm{LB}}{\underset{\_}{Z}}_{1\mathrm{AB}}}{{\underset{\_}{Z}}_{1\mathrm{LB}}+{\underset{\_}{Z}}_{1\mathrm{AB}}}\right)\mathrm{where}\text{:}$ Z_1AB=impedance for the positive sequence of the extra link, Z_1LA=positive-sequence impedance of the healthy line. A compensation is determined for the shunt capacitance with the aid of an equation of the form: B₂^comp-1(d_comp-1)²+B₁^comp-1d_comp-1+B₀^comp-1=0 where: B₂^comp-1=A_2-Re^comp-1A_00-Im^comp-1-A_2-Im^comp-1A_00-Re^comp-1 B₁^comp-1=A_1-Re^comp-1A_00-Im^comp-1-A_1-Im^comp-1A_00-Re^comp-1 B₀^comp-1=A_0-Re^comp-1A_00-Im^comp-1-A_0-Im^comp-1A_00-Re^comp-1. The zero-sequence current is determined from the healthy line of a section of parallel power lines. A distance to a fault is calculated for the parallel line section. The distance to the fault from the first end is calculated using a quadratic equation of the form: B₂d²+B₁d+B₀=0 where: B₂=A_2-ReA_00-Im-A_2-ImA_00-Re B₁=A_1-ReA_00-Im-A_1-ImA_00-Re B₀=A_0-ReA_00-Im-A_0-ImA_00-Re.

Saha, Murari Mohan
Izkowski, Yang
Rosorowski, Eugenius

JP2004515334A

February 16, 2006

June 18, 2003

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Arbor Arbor

G01R31/08; H02H3/38; H02H7/26

Takehiko Suzue
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto

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