Transformer winding and fuse fault evaluation method, device and equipment

A technology of fault assessment and transformer, applied in the direction of measuring devices, electrical winding tests, instruments, etc., can solve problems such as repeated faults, qualitative judgment, influence on guiding maintenance and operation strategies, etc.

Active Publication Date: 2019-04-16
GUANGDONG POWER GRID CO LTD +1
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AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present application provides a transformer winding and fuse fault assessment method, device and equipment, which solves the problem that the existing electromagnetic voltage transformer disintegration observation is used to judge the cause of the fault. Qualitative judgment of the cause of the failure, which affects the formulation of guidance for maintenance and operation strategies, resulting in technical problems that occur repeatedly

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  • Transformer winding and fuse fault evaluation method, device and equipment
  • Transformer winding and fuse fault evaluation method, device and equipment
  • Transformer winding and fuse fault evaluation method, device and equipment

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Embodiment Construction

[0051] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0052] For ease of understanding, see figure 1 , a transformer winding and fuse fault assessment method provided in the embodiment of the present application, including:

[0053] Step 101. Obtain the time-varying curve of single-phase grounding recovery voltage according to the parameters of the small-current grounding system. The parameters of the small-current g...

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Abstract

The application discloses a transformer winding and fuse fault evaluation method, device and equipment. A changing curve of a single-phase grounding recovery voltage of a small current grounding system with time is calculated; integrating processing is carried out on the recovery voltage to obtain a changing rule of the iron core flux with time; the saturation situation of the transformer is estimated; whether an over-current risk caused by saturation exists is determined; an excitation current and fuse energy at an initial stage are calculated; whether the fuse has a fusing risk is determined; all excitation currents and energy accumulation before the neutral point displacement recovery are calculated; and whether the primary winding has an overheating risk is determined. Therefore, technical problems that the winding burning and fuse fusing causes can not be determined qualitatively when the existing electromagnetic voltage transformer is observed in a split manner for the fault factor determination and thus the inspection and maintenance and running strategy making is affected and the faults occur frequently are solved.

Description

technical field [0001] The present application relates to the technical field of electrical equipment fault detection, in particular to a transformer winding and fuse fault assessment method, device and equipment. Background technique [0002] At present, electromagnetic voltage transformers are widely used in small current grounding systems to provide protection for small current grounding systems, and their operational reliability directly affects the safe operation of the system. [0003] Due to the saturation characteristic of the iron core, electromagnetic voltage transformers are prone to saturation in the event of single-phase grounding and fault recovery, lightning and operation disturbances in the system, resulting in an increase in the current of the primary winding and a decrease in the inductance value, often causing the primary winding to burn or The fuse is blown, so that the electromagnetic voltage transformer is out of operation or even burned. At present, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/06G01R31/07G01R35/02G01R31/74
CPCG01R35/02G01R31/72G01R31/74
Inventor 周原林一峰蔡玲珑
Owner GUANGDONG POWER GRID CO LTD
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