Protecting method for short-circuit between wire coils of parallel reactor of ultrahigh voltage transmission line
A technology of inter-turn short circuit and reactor, which is applied in the direction of automatic disconnection emergency protection device, circuit device, emergency protection circuit device, etc., and can solve problems affecting compensation characteristics, inter-turn fault protection performance defects, and unfavorable protection. , to achieve the effect of improving the sensitivity
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[0020] Shunt reactors are generally connected to one or both ends of the ultra-high voltage transmission line in a Y shape. In order to suppress problems such as potential supply current and resonance overvoltage, shunt reactors often have a small reactance at the neutral point. The equivalent circuit of the shunt reactor connected to the ultra-high voltage system is as follows: figure 1 shown. Z in the picture L is the shunt reactor impedance; Z N Small reactance for the neutral point.
[0021] During normal operation, the sequence current relationship is Assuming that there is a turn-to-turn fault in phase A of the shunt reactor, its impedance changes as Z F . According to the symmetrical component method, the fault sequence network diagram of inter-turn short circuit can be calculated as follows: figure 2 shown.
[0022] From the analysis of the sequence network diagram, it can be seen that when there is a slight inter-turn fault, z = ...
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