Method and system for online monitoring state of transformer substation oil-deficient equipment

Abstract

The invention discloses a method and a system for online monitoring the state of transformer substation oil-deficient equipment. The method comprises the following steps of: (1) acquiring a low-frequency signal in the online transformer substation oil-deficient equipment; (2) judging whether the state of the transformer substation oil-deficient equipment is normal or abnormal based on the low-frequency signal; (3) when the state of the transformer substation oil-deficient equipment is judged to be abnormal, acquiring a high-frequency signal in the online transformer substation oil-deficient equipment; and based on the high-frequency signal, adopting a spatial spectrum estimation method to determine the partial discharge condition of the transformer substation oil-deficient equipment to realize discharge position positioning. According to the method and the system, the high and low frequency signal data obtained through comprehensive collection can realize on-line monitoring of the transformer substation oil-deficient equipment, the state of the oil-deficient equipment can be better grasped, and the accuracy, reliability and safety of monitoring can be improved.

Description

technical field [0001] The invention belongs to the technical field of monitoring low-oil equipment in substations, and in particular relates to a method and system for online monitoring the status of low-oil equipment in substations. Background technique [0002] There are a large number of oil-less equipment (such as transformers, reactors, current transformers (TA), voltage transformers (TV) and bushings, etc.) in power system substations, which assist the power system to achieve power transmission and distribution functions. After many years of continuous operation, as the internal insulation performance of oil-less equipment decreases, the probability of equipment discharge and heat generation will increase; more serious problems may evolve into equipment failures and guarantees that cause large-scale power outages in substations, causing serious damage to the national economy and production. Negative impact. [0003] In recent years, by strengthening the maintenance o...

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Problems solved by technology

[0004] At present, the detection methods and means of oil-less equipment in substations are relatively scarce. On the one hand, the current detection only analyzes the individual characteristics of the equipment, and often only uses high-frequency sensors to collect high-frequency current information to evaluate the operation of the equipment; on the other hand, the current The detection method mainly adopts oil chromatography, which needs to collect the oil inside the equipment, and collecting oil multiple times will cause negative pressure and damage the seal of the equipment, which may easily cause the equipment to explode

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