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A single-phase ground fault detection method and device in distribution network

A single-phase ground fault and detection method technology, applied in the direction of fault location, fault detection according to conductor type, information technology support system, etc., can solve the problems of complex grounding device and cumbersome detection process, and achieve reduced complexity and safety High performance, security and stability

Active Publication Date: 2021-12-03
济南泰景电力技术有限公司
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  • Abstract
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Problems solved by technology

Moreover, the inventor found that the existing single-phase ground fault detection needs to connect the arc suppressing coil and the high-resistance grounding device, which makes the grounding device complicated and the detection process is cumbersome

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  • A single-phase ground fault detection method and device in distribution network
  • A single-phase ground fault detection method and device in distribution network

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Embodiment Construction

[0023] The present disclosure will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0025] It should be noted that the terminology used herein is only for describing specific embodiments, and is not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

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Abstract

The disclosure provides a single-phase ground fault detection method and device of a distribution network. Among them, the single-phase ground fault detection method of the distribution network includes step 1: when the resistance to ground of the neutral point of the low-voltage side of the distribution network transformer is less than 150 ohms, connect the grounding down conductor of the neutral point of the low-voltage side of the distribution network transformer to an independent Grounding grid, the resistance to ground of the independent grounding grid is not less than 150 ohms; Step 2: Measure the current I between the neutral point and the corresponding grounding grid 0 , Phase A current I a and C-phase current I c ; Step 3: Simultaneously sample and compare I 0 and I a , I c size, if I 0 The amount of change and I a The variation of A is the same and greater than the preset threshold value, then it is determined that phase A is grounded; if I 0 The amount of change and I c The change amount of is the same, then it is judged that phase C is grounded. It can cancel the current traditional measures such as arc suppressing coils and high-resistance grounding devices, greatly reduces the complexity of the existing grounding devices, and has higher safety.

Description

technical field [0001] The disclosure belongs to the field of distribution network fault detection, and in particular relates to a single-phase ground fault detection method and device of a distribution network. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] At present, according to the neutral point grounding method of the main transformer of the transmission line, the power grid is divided into a direct grounding system and an indirect grounding system. In my country, high-voltage transmission lines (above 110kV) belong to the direct grounding system, also known as the high-current grounding system. Low-voltage lines (35kV and below) belong to the indirect grounding system of the transformer neutral point, also known as the small current grounding system. Since the small current grounding system is responsible for delivering power to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086Y04S10/52
Inventor 丁超文
Owner 济南泰景电力技术有限公司
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