Single-phase grounding fault detection and positioning method and system for low-current grounding power distribution network
A low-current grounding and grounding fault technology, applied in the fault location and other directions, can solve problems such as the inability to accurately locate the grounding fault position, the inability to generate a large enough coded signal current fault indicator, and the large 5th harmonic current of the faulty line. The effect of facilitating manual line inspection to locate ground faults
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[0081] Figure 6 shows the principle of the method of the present invention.
[0082] Figure 6A It shows that when a single-phase ground fault occurs in a phase of a small-current grounded distribution network feeder, the voltage and current on both sides of the ground point will change drastically in a short period of time during the transient process of the ground fault. Abnormal transient voltage signals and current signals are generated. The feeder monitoring unit disclosed in the present invention mainly relies on the power-taking device from the feeder, and the battery is used as a backup. The core of the power-taking device for the feeder is a magnetic substance with a closed magnetic circuit, which is divided into two halves, respectively located in the upper part and the main body of the equipment. Inside, the tight closure of the magnetic circuit is realized by a locking mechanism, which is composed of a locking spring or other type of elastic mechanism located in t...
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