Grounding fault detection device and method

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

Active Publication Date: 2019-01-11
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 gene

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  • Grounding fault detection device and method

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specific Embodiment

[0038] 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.

[0039] 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 invention relates to the technical field of fault detection, and provides a grounding fault detection device and method. The device comprises a first detection module, a second detection module and a controller, one terminal of the first detection module is connected with a grounding electrode of a photovoltaic generation system, the other terminal of the first detection module is connected tothe ground, the first detection module comprises a first controllable switch and a first current detection unit connected in series, one terminal of the second detection module is connected with a non-grounding electrode of the photovoltaic generation system, the other terminal of the second detection module is connected to the ground, the second detection module comprises a second controllable switch and a second current detection unit, and the controller is used for determining whether grounding faults exist at a DC side before grid connection and at a DC side and an AC side during grid-connected operation of the photovoltaic generation system according to a first sampling current detected by the first detection module and a second sampling current detected by the second detection module and sending an alarm signal if yes. According to the grounding fault detection device, multi-point grounding faults of the photovoltaic generation system can be realized, and the operation securityof the system is guaranteed.

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...

Claims

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Application Information

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IPC IPC(8): G01R31/02
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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