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Extraction method, line selection method and system for small-current grounding fault quantity of transformer

A low-current grounding and transformer fault technology, applied in transformer testing, short-circuit testing, etc., can solve problems such as difficulty in characteristic information, and achieve the effects of improving sensitivity, good extraction effect, and improving the speed of low-current grounding line selection.

Active Publication Date: 2020-06-12
李晓明
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Problems solved by technology

When the grounding fault occurs in the small current grounding system, the fault quantity in the phase current of the load side of the transformer is superimposed on the load current, and the fault quantity is much smaller than the load current, so it is difficult to extract the characteristic information of a small fault quantity from a large current

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  • Extraction method, line selection method and system for small-current grounding fault quantity of transformer

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Embodiment Construction

[0024] The present disclosure will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] 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.

[0026] 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 invention provides an extraction method, a line selection method and system for a small-current grounding fault quantity of a transformer. According to the three-phase current at the power supplyof the transformer, the load current of each phase of the load side of the transformer is calculated, the load side fault quantity of the transformer is obtained by eliminating the load current in thephase current of the load side of the transformer through the power side current of the transformer, the fault quantity of the transformer of a low-current grounding system can be extracted more effectively, and the low-current grounding line selection sensitivity is improved.

Description

technical field [0001] The disclosure belongs to the technical field of electric power system relay protection, and in particular relates to a method for extracting a small current grounding fault quantity of a transformer, a line selection method and a system. 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] The small current grounding system includes the neutral point ungrounded system and the neutral point grounded system through the arc suppression coil. When a ground fault occurs in a small current grounding system, the fault line needs to be selected. All existing small current grounding line selection methods are to judge the fault line based on the information characteristics of the fault quantity generated after the small current grounding system fails. The latest research shows that the sensitivity and performance of small curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/52G01R31/62
Inventor 李晓明
Owner 李晓明
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