CHEN Hui,HUANG Xin,ZHANG Lei,et al.Unbalanced Voltage Based Protection Method for Inter-turn Short-circuit Fault of Phase-controlled Reactor[J].Automation of Electric Power Systems,2021,45(24):158-164.
CHEN Hui,HUANG Xin,ZHANG Lei,et al.Unbalanced Voltage Based Protection Method for Inter-turn Short-circuit Fault of Phase-controlled Reactor[J].Automation of Electric Power Systems,2021,45(24):158-164. DOI: 10.7500/AEPS20201013005.
Unbalanced Voltage Based Protection Method for Inter-turn Short-circuit Fault of Phase-controlled Reactor
Phase-controlled reactor belongs to dry-type air-core reactor in structure. During operation
its current will change with phase control trigger angle
and its equivalent impedance also changes. The inter-turn short-circuit protection of the conventional dry-type air-core reactor is designed and implemented for the constant impedance reactor
which is not suitable for phase-controlled reactor. This paper presents an inter-turn short-circuit fault protection method for the phase-controlled reactor. First
according to the wiring and working characteristics of phase-controlled reactors
the unbalanced voltage between the two reactors is obtained. Then
the unbalanced current is calculated by sliding data window integration. Finally
based on the principle of differential protection
the judgment of inter-turn short-circuit fault is realized. The proposed method eliminates the influence of thyristor trigger angle on inter-turn short-circuit fault criterion. Real-time digital simulation results based on actual engineering parameters verify the effectiveness of the proposed method.
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