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High-resistance grounding identification method of isolated neutral system

A technology of ungrounded neutral point and high-resistance grounding, which is applied in the direction of grounding resistance measurement, measuring devices, instruments, etc., and can solve the problems of low identification accuracy of high-resistance grounding

Active Publication Date: 2019-09-17
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0004] This application provides a method for identifying high-impedance grounding in a neutral point ungrounded system to solve the problem of low accuracy in identifying high-impedance grounding in existing neutral point ungrounded systems

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  • High-resistance grounding identification method of isolated neutral system
  • High-resistance grounding identification method of isolated neutral system
  • High-resistance grounding identification method of isolated neutral system

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Embodiment Construction

[0030] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0031] see figure 1 , which is a schematic diagram of detection of high-impedance grounding in a neutral point ungrounded system provided by the embodiment of the present application, figure 1 Among them, L is the system bus, an external power supply 1 is set between the grounding transformer 5 and the ground, the distributed capacitance 2 o...

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Abstract

The invention provides a high-resistance grounding identification method of an isolated neutral system. The high-resistance grounding identification method comprises the steps of applying a first detection voltage to a neutral point of the system by an external power supply; detecting a first characteristic voltage of the neutral point of the system on ground and a first characteristic current output from the external power supply; applying a second detection voltage to the neutral point of the system by the external power supply; detecting a second characteristic voltage of the neutral point of the system on the ground and a second characteristic current output from the external power supply; calculating to obtain first system-to-ground leakage resistance according to the first characteristic voltage, the first characteristic current, the second characteristic voltage and the second characteristic current; judging whether the first system-to-ground leakage resistance is within a preset threshold range or not; and judging that high-resistance grounding occurs in the isolated neutral system if the first system-to-ground leakage resistance exceeds the preset threshold range. The high-resistance grounding identification method has the advantage of high identification accuracy on the high-resistance grounding of the isolated neutral system.

Description

technical field [0001] The present application relates to the technical field of single-phase grounding identification in power grid systems, in particular to a method for identifying high-impedance grounding in a neutral point ungrounded system. Background technique [0002] Single-phase-to-earth fault is a common system fault in distribution network. In my country's distribution network, overhead lines still account for the absolute majority, and most distribution networks operate in the neutral point ungrounded mode. The single-phase ground faults in the overhead distribution network are mainly high-resistance ground faults. Other faults such as metallic ground faults and low-resistance ground faults are often developed from high-resistance ground faults. Therefore, accurately judge high-resistance ground faults and deal with them in a timely manner. , can effectively reduce the occurrence probability of metallic ground faults and low resistance ground faults, and improv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R31/08G01R27/20
CPCG01R31/086G01R31/088G01R27/20G01R31/50
Inventor 刘红文王科赵现平
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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