Single-phase grounding fault handling method suitable for low-current grounding systems
A single-phase ground fault, small current grounding technology, applied to the fault location, fault detection according to the conductor type, measurement of electricity, etc., can solve the problems of lack of principle protection schemes, inability to adapt to distribution network protection systems without communication conditions, etc. Achieve the effects of short fault handling time, short isolation time, and small fault power outage range
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[0044] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0045] The overcurrent protection method is often used for short-circuit faults. Due to the short distribution lines and many branch lines, it is impossible to realize the cooperation between the outgoing line protection, the branch line protection, and the distribution transformer protection only by using the current fixed value, and there are many delays between the protection levels To cooperate, in order to ensure rapidity, the number of series is generally controlled within three levels. For small current single-phase ground faults, capacitive currents exist both upstream and downstream of the fault point; especially in the arc suppression coil system, due to the compensation function of the arc suppression coil, the current difference between the upstream and downstream of the fault point is small, and the overcurrent principle cannot be used to achieve protecti...
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