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Ground fault detection device and method

A ground fault and detection device technology, which is applied in the direction of measuring device, measuring voltage, short circuit test, etc., can solve problems such as fire, inability to detect multi-point ground faults, aging of ground cable insulation, etc., and achieve effective detection effects

Active Publication Date: 2021-09-24
厦门科华数能科技有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a ground fault detection device and method, aiming to solve the problem that the multi-point ground fault in the photovoltaic power generation system cannot be effectively detected in the prior art, which causes the ground cable to flow a large fault current for a long time. aging of the insulation, and even cause fire problems

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  • Ground fault detection device and method

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specific Embodiment

[0039] It should be noted that, for the convenience of description, the single-point grounding system described in the embodiments of the present application is an example of a photovoltaic power generation system, including a photovoltaic array that converts solar energy into electrical energy and outputs direct current, and an inverter that converts direct current into alternating current DC / AC; the single-point grounding means that only a single grounding point is allowed in the photovoltaic power generation system (the positive pole or negative pole set at the output end of the photovoltaic array, that is, the positive pole or negative pole on the DC side). For the convenience of description, this application implements The examples all take the negative grounding system as an example.

[0040] Such as figure 1 As shown, the ground fault detection device provided by the embodiment of the present invention includes: a first detection module 10 , a second detection module 20...

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Abstract

The present invention relates to the technical field of fault detection, and provides a ground fault detection device and method. The device includes: a first detection module, a second detection module and a controller; one end of the first detection module is connected to a ground electrode of a photovoltaic power generation system , the other end is grounded, including a first controllable switch connected in series and a first current detection unit; A switch and a second current detection unit; the controller is used to judge the current of the photovoltaic power generation system before grid connection according to the first sampling current detected by the first detection module and the second sampling current detected by the second detection module Whether there is a ground fault on the DC side and the DC side and the AC side during grid-connected operation, and if there is a ground fault, an alarm signal will be sent. The above-mentioned ground fault detection device can realize multi-point ground faults of the photovoltaic power generation system and ensure safe operation of the system.

Description

technical field [0001] The invention belongs to the technical field of fault detection, and more specifically relates to a ground fault detection device and method. Background technique [0002] In a photovoltaic power generation system, since photovoltaic cells are affected by polarization effects and transparent conductive oxide (TCO) erosion, this effect will directly lead to a significant drop in the power generation efficiency of the panel, and even cause permanent damage to the panel. Therefore, it is necessary to form a single-point grounding system by grounding the negative pole (or positive pole) of the photovoltaic cell array to solve the above problems. [0003] In traditional technology, a fuse is often used to directly ground the negative pole of the single-point grounding system. When a direct grounding fault occurs, the fault current is much greater than the rated current of the fuse, which triggers the disconnection of the fuse to achieve the effect of ground...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/52
CPCG01R31/50
Inventor 曾春保洪培在魏闻林镇煌陈凯龙
Owner 厦门科华数能科技有限公司
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