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

A technology of equipment status and substations, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as lack of detection methods and means, damage to seals, negative pressure of equipment, etc., to achieve good promotion of practical application value and improve accuracy , The results of the judgment are accurate and the effect

Pending Publication Date: 2021-10-29
STATE GRID SHAANXI ELECTRIC POWER RES INST +2
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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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  • Method and system for online monitoring state of transformer substation oil-deficient equipment
  • Method and system for online monitoring state of transformer substation oil-deficient equipment
  • Method and system for online monitoring state of transformer substation oil-deficient equipment

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Embodiment Construction

[0068] In order to make the purpose, technical effects and technical solutions of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments It is a part of the embodiment of the present invention. Based on the disclosed embodiments of the present invention, other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall all fall within the protection scope of the present invention.

[0069] The current acquisition devices mainly use high-frequency sensors, which cannot fully reflect the operating status of the oil-less equipment in the substation. Therefore, the present invention collects the high-frequency and low-frequency currents collected in the integrated sensor by integrating high-frequency and low-fr...

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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...

Claims

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Application Information

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IPC IPC(8): G01R23/00G01R31/00
CPCG01R23/00G01R31/00
Inventor 张璐孙蕾韩彦华聂永欣王文森师一卿吴昊袁鹏刘强吴经锋王辰曦李高阳
Owner STATE GRID SHAANXI ELECTRIC POWER RES INST
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