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Fault detection method, device, system and equipment for filter capacitor

A filter capacitor and fault detection technology, which is applied in the direction of measuring devices, instruments, and measuring electronics, can solve the problems of low fault detection accuracy, achieve high accuracy, prevent serious faults, and improve reliability

Active Publication Date: 2021-11-30
CHINA SHENHUA ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of realizing the present invention, the inventors found that the traditional three-phase filter capacitor fault detection method has the problem of low fault detection accuracy

Method used

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  • Fault detection method, device, system and equipment for filter capacitor
  • Fault detection method, device, system and equipment for filter capacitor
  • Fault detection method, device, system and equipment for filter capacitor

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Embodiment Construction

[0041] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application. It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to another element and integrated with it, or there may be an intermediate element at the same time, that is, it may also be indirectly connected to another element .

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are only for the pur...

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Abstract

The invention relates to a fault detection method, device, system and equipment for a filter capacitor. The fault detection method of the filter capacitor includes the steps of: obtaining the phase voltage and the phase current of the three-phase filter capacitor; according to the phase voltage and the phase current, calculating the positive sequence phase voltage and the negative sequence phase voltage corresponding to the phase voltage by extracting the symmetrical component method, and The positive-sequence phase current and negative-sequence phase current corresponding to the phase current; according to the positive-sequence phase voltage, negative-sequence phase voltage, positive-sequence phase current and negative-sequence phase current, the equivalent Conductance; determine the fault state of the three-phase filter capacitor based on the equivalent conductance. Through impedance asymmetry detection based on phase voltage and phase current data of three-phase filter capacitors, equivalent conductance can be determined to detect extremely small line current changes, so that extremely small impedance changes can be detected to accurately sense three-phase filtering Whether the capacitor is faulty.

Description

technical field [0001] The invention relates to the technical field of rail transportation, in particular to a fault detection method, device, system and equipment for a filter capacitor. Background technique [0002] With the development of rail transportation technology, rail transit vehicles, operation and maintenance support and surrounding services are being rapidly upgraded. In the auxiliary transformer system on rail transit vehicles, the three-phase filter capacitor (ACC) is used as a component of the AC filter circuit, which can filter out the high-frequency components in the voltage output by the transformer to obtain a three-phase filter with low harmonic content. Phase-phase sinusoidal voltage. Although the three-phase filter capacitor is a relatively reliable component, it is not completely fault-free, and when the three-phase filter capacitor is damaged or even explodes, the consequences will be disastrous. In order to eliminate this potential safety hazard a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R29/16G01R19/00
CPCG01R19/00G01R29/16G01R31/00
Inventor 郑亚平田劲松单俊强王永军
Owner CHINA SHENHUA ENERGY CO LTD
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