Transformer winding and fuse fault evaluation method, device and equipment

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...

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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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