Open AccessThree‐phase adaptive reclosure for transmission lines with shunt reactors using mode current oscillation frequencies
Author(s) -
Huang Xinghua,
Song Guobing,
Wang Ting,
Gu Yaobin
Publication year - 2018
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.0199
Subject(s) - oscillation (cell signaling) , electric power transmission , shunt (medical) , acoustics , phase (matter) , control theory (sociology) , three phase , materials science , current (fluid) , electrical engineering , physics , computer science , engineering , voltage , chemistry , medicine , biochemistry , control (management) , quantum mechanics , artificial intelligence , cardiology
A three‐phase adaptive reclosing scheme using mode current oscillation frequencies is proposed for transmission lines with shunt reactors. Firstly, with phase‐mode transformation, the fault boundary conditions are analysed and then the composite mode networks are constructed, respectively, for transient faults and permanent faults. In the composite networks, mode currents of shunt reactors are computed and thus oscillation frequencies are obtained. It is found that in transient fault situations, mode currents oscillate in only one frequency which is the natural frequency of the corresponding mode network. By contrast, the number of frequency components varies in permanent fault situations, depending on the fault type. Based on the frequency characteristics discussed above, a three‐phase adaptive reclosing scheme is conceived. In the scheme, the transient fault is identified only if the shunt reactor mode currents contain one frequency which is equal to the natural frequency of the corresponding mode network. Otherwise the fault is taken to be permanent. By simulation, the correctness of the frequency characteristics is verified and the reclosing scheme is validated, hardly affected by fault locations and fault resistance.