Single-pole ground fault protection method for DC lines based on similarity of current mode components
A single-pole ground fault, DC line technology, applied in emergency protection circuit devices, short-circuit testing, electrical components, etc., can solve problems such as unobvious fault characteristics, high single-pole fault rate of DC distribution network, and increased difficulty of fault identification , to achieve the effect of strong resistance to transition resistance
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[0015] The present invention will be further described below.
[0016] A single-pole grounding fault protection method for DC lines based on similarity of current mode components, comprising the following steps:
[0017] a) When a single-pole ground fault occurs, the electrical quantities of the positive and negative electrodes are not symmetrical, so the phase-mode decoupling matrix is used to obtain the current-mode component x 1 and the zero modulus component x 0 , when the line fails, the fault current-modulus component x 1 with zero modulo component x 0 equal. When an out-of-area fault occurs and normal operation occurs, the sum of a mode current at both ends of the line is a mode current on the ground capacitor. Due to the symmetrical characteristics of the capacitor blocking the DC and DC distribution networks, the current on the ground capacitor is mainly harmonic current and the positive and negative lines are symmetrical. Therefore, the one-mode current of the ...
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