Oil level monitoring method and monitoring system of an oil-immersed transformer oil storage system

Abstract

The invention provides an oil level monitoring method of an oil storage system of an oil-immersed transformer. The oil level monitoring method comprises the following steps that first, a pressure sensor is mounted on the oil-immersed transformer for collecting pressure signals to calculate the average temperature of transformer oil; second, the expanding volume of the transformer oil is calculated according to the average temperature of the transformer oil; third, the oil level of the oil storage system is calculated according to the expanding volume of the transformer oil and the shape of the oil storage system of the oil-immersed transformer to obtain corresponding oil level signals; when the oil level or oil pressure exceeds a set safety value, a monitoring terminal sends out alarm signals. The invention further provides an oil level monitoring system based on the oil level monitoring method. The oil level monitoring system comprises the pressure sensor arranged on the transformer and the monitoring terminal connected with the output end of the pressure sensor. The monitoring terminal is used for converting the pressure signals collected by the pressure sensor into oil level signals and meanwhile monitoring the oil level signals and the pressure signals. When the oil level signals or the pressure signals exceed the safety value, the monitoring terminal sends out an alarm.

Description

technical field [0001] The invention relates to the field of transformer oil level monitoring, in particular to an oil level monitoring method and monitoring system of an oil-immersed transformer oil storage system. Background technique [0002] The oil level monitoring of the oil-immersed transformer oil storage system in the prior art is to install the head of the oil level gauge at the bottom of the transformer oil conservator. The buoyancy drives the connecting rod to move, the connecting rod drives the gear in the meter head to rotate, and the gear drives the pointer of the oil gauge to rotate to display the oil level of the oil conservator. The disadvantage of this monitoring method is that the accuracy is not high. [0003] In recent years, with the development of power technology, the requirements for power equipment monitoring have become higher and higher. The oil level monitoring of the traditional mechanical oil-immersed transformer oil storage system has been un...

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Problems solved by technology

[0002] The oil level monitoring of the oil-immersed transformer oil storage system in the prior art is to install the head of the oil level gauge at the bottom of the transformer oil conservator. The buoyancy drives the connecting rod to move, the connecting rod drives the gear in the meter head to rotate, and the gear drives the pointer of the oil gauge to rotate to display the oil level of the oil conservator. The disadvantage of this monitoring method is that the accuracy is not high

[0003] In recent years, with the development of power technology, the requirements for power equipment monitoring have become higher and higher. The oil level monitoring of the traditional mechanical oil-immersed transformer oil storage system has been unable to meet the accuracy requirements for oil-immersed transformer oil level. Therefore, a new monitoring method is needed, and the oil level monitoring of the pressure principle becomes an option

However, due to the structural characteristics of the transformer, although the existing oil level monitoring is to obtain the oil level data through the monitoring of the oil pressure in the oil storage system, it is actually unable to provide accurate oil level data; because the transformer is a fully sealed structure, the monitoring The oil level of the oil storage system of the transformer is to monitor the expansion and contraction volume of the shrinkable air capsule (bellows) in the oil storage system of the transformer. Therefore, the highest oil level of the transformer is a fixed value for each product, and the change of the transformer pressure is Changes due to changes in transformer oil temperature, so the change in volume of transformer oil is calculated from the change in pressure

In the prior art, only the influence of transformer oil level in the oil pressure is considered, and the method of calculating the oil level directly according to the pressure relationship through the oil pressure cannot accurately obtain the oil level value in the oil storage system, which brings serious problems to production and maintenance. adverse effects of

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