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Single-phase grounding fault identification method for small-current grounding system

A single-phase grounding fault, small current grounding technology, applied in the fault location, detecting faults according to conductor type, measuring electricity and other directions, can solve the problems of small fault current and low sensitivity of fault indicator, and achieve improved sensitivity and flexible topology. Adjust and implement clear effects

Pending Publication Date: 2021-06-18
CHONGQING UNIV
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Problems solved by technology

[0005] In summary, due to the small fault current when the single-phase ground fault occurs in the distribution line of the small current grounding system, the sensitivity of the fault indicator is low, and when the fault occurs, it indicates the fault section

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  • Single-phase grounding fault identification method for small-current grounding system

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Embodiment Construction

[0020] A single-phase grounding fault identification method for a small current grounding system, providing overvoltage protection through a neutral point grounding resistance, and indicating the fault through a fault indicator at the cable outlet. Set the number of fault indicators according to the number of lines, and the outlets of each feeder and branch line are connected with fault indicators FD 1 、FD 2 ,...,FD m , where m is the total number of fault indicators.

[0021] The neutral point grounding resistor is a resistor device with variable impedance to the ground branch, and the neutral point grounding resistor is connected in series with the main grounding switch. The neutral point grounding resistance can adopt the following three structural forms: 1) The neutral point grounding resistance is a variable resistor, and the impedance adjustment method of the variable resistor is a prior art, and will not be repeated here. 2) The neutral point grounding resistance inc...

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Abstract

The invention discloses a single-phase grounding fault identification method for a small-current grounding system, and the method comprises the steps: enabling a controller to achieve the switching of each neutral point grounding resistor through controlling the switching-on and switching-off of each circuit breaker, and determining whether the neutral point grounding resistor is switched in or not according to the zero-sequence voltage of a bus; and determining the number of input neutral point grounding resistors according to the size of the outgoing line zero-sequence current, so that the fault current of each fault indicator is increased, the sensitivity of the fault indicator is improved, and a fault section is accurately positioned. The method solves the problems that in the prior art, a fault indicator is insufficient in sensitivity and inaccurate in fault section positioning, the sensitivity of the fault indicator is improved by changing the neutral point wiring mode, and the method has wide applicability and high feasibility.

Description

technical field [0001] The invention relates to the field of power system fault identification, in particular to a single-phase ground fault identification method of a small current ground system. Background technique [0002] With the rapid development of economy and society, people's life depends on electric energy, and my country's electric power industry is also developing continuously. The power grid has tended to the planning direction of "high voltage, large capacity, wide range", and the reliability requirements for power supply safety must be improved. . The distribution network directly provides electric energy for users, and the safety and reliability of its operation directly affects the economic loss and quality of life of users. At present, my country's distribution network widely adopts small current grounding methods, including neutral point not grounding, neutral point grounding through arc suppression coil, and neutral point grounding through high resistanc...

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Application Information

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IPC IPC(8): G01R31/52G01R31/08
CPCG01R31/52G01R31/086G01R31/088Y04S10/52
Inventor 熊小伏肖扬
Owner CHONGQING UNIV
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