Oil level anomaly detection method and system for oil-immersed transformer body

Abstract

The invention discloses an oil level anomaly detection method and system for an oil-immersed transformer body. The method comprises the steps: enabling the oil level of a transformer to be in a linearrelation with the change of the oil temperature in a 30 to70% of oil level range, and directly acquiring an actual oil level value and an actual oil temperature value of the transformer through reading; under a certain oil temperature value, setting a fluctuation range value of the oil level value and an error value of the oil temperature value, and carrying out operation based on the linear relation to obtain an upper limit value and a lower limit value of the oil level; and outputting an abnormal oil level existing signal under the condition that the oil level value is not within the rangevalue formed by the upper limit value and the lower limit value. According to the invention, fitting is carried out on the oil level and oil temperature curves of the transformer; the upper limit value and the lower limit value of the oil level of the transformer are calculated, the actual oil level is compared with the upper limit value and the lower limit value, and the abnormal fault of the oillevel of the transformer is detected; the actual oil level period sampling is compared with the lower limit value and the oil leakage fault of the transformer body is further judged, so that early warning of the fault is realized. The real-time monitoring of the oil level change in the transformer is facilitated.

Description

technical field [0001] The invention relates to the technical field of transformer oil level detection, in particular to a method and system for abnormal oil level detection of an oil-immersed transformer body. Background technique [0002] Oil-immersed transformers use insulating oil as the main insulating means of the transformer, and rely on oil as the cooling medium, such as oil-immersed self-cooling, oil-immersed air-cooled, oil-immersed water-cooled and forced oil circulation. Long-term oil leakage or a lot of oil leakage, failure to replenish oil in time after maintenance and draining, low temperature and insufficient oil storage in the oil pillow, etc., will cause the transformer oil level to be too low or seriously lack of oil. In addition, the blockage of the oil gauge pipe, the needle of the pointer oil level gauge, the blockage of the vent hole of the explosion-proof pipe, the blockage of the respirator, the accumulation of gas under the diaphragm or the capsule,...

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Problems solved by technology

[0010] In view of the above problems, the present invention proposes a method and system for detecting abnormal oil level of an oil-immersed transformer body, which mainly solves the technical problem that the method of calculating the theoretical value of the oil level of the transformer body by theoretical formulas cannot accurately judge the actual situation of the oil level of the transformer body

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