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Neutral point resistor grounding system zero sequence current protection method and system

A neutral point grounding and zero-sequence current technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as small effect, achieve simple protection, broad application prospects, and improve sensitivity.

Inactive Publication Date: 2018-01-23
李晓明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The setting value of this method is fixed. Once the manual setting is completed, it can no longer be adjusted automatically with the change of the working mode of the power system.
Therefore, this method can improve the sensitivity of the zero-sequence current active component, but the effect is small

Method used

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  • Neutral point resistor grounding system zero sequence current protection method and system
  • Neutral point resistor grounding system zero sequence current protection method and system

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. 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 application belongs.

[0031] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. 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 combinatio...

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Abstract

The invention discloses a neutral point resistor grounding system zero sequence current protection method and system. The feature that the reverse direction of a zero sequence current active componentof a faulty line is equal to the current active component of the neutral point grounding resistor forms a zero sequence current active component protection action criterion, the zero sequence currentactive component protection sensitivity is improved, the reliability is high, the feature that voltage at two ends of the neutral point grounding resistor and zero sequence voltage outputted by a busvoltage transformer have close phase and amplitude is also used, the zero sequence voltage outputted by the bus voltage transformer and the voltage at two ends of the neutral point grounding resistorcan be replaced mutually. The calculation process can be simplified, and wiring of the protection device can be simplified.

Description

technical field [0001] The invention relates to the field of relay protection for electric power systems, in particular to a zero-sequence current protection method and system for a neutral point resistance grounding system. Background technique [0002] The neutral point resistance grounding system adopts zero-sequence current protection, which has the advantages of simple protection structure and high reliability. However, the high-resistance grounding occurs in the neutral point resistance grounding power system, and the existing zero-sequence current protection is not sensitive enough to trip correctly, resulting in the expansion of accidents. [0003] In the neutral point resistance grounding system, using the zero-sequence current active component as a criterion can improve the sensitivity of zero-sequence current protection, which is described in many patents and documents. However, the setting value (or threshold value) of the previous zero-sequence current active c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 李晓明
Owner 李晓明