Transformer expansion tank oil level measuring system

Abstract

The invention discloses an oil level measuring system for a transformer oil conservator. The oil level measuring system comprises a measuring oil column, a first pressure sensor, a second pressure sensor and a tester which are arranged beside a transformer oil conservator. A vent valve is arranged at the top end of the measuring oil column, and an oil inlet is formed in the lower part of the measuring oil column and is connected with the lower part of the transformer oil conservator through an oil pipe; the first pressure sensor and the second pressure sensor are arranged in the middle of the measuring oil column, and the vertical height between the first pressure sensor and the second pressure sensor is a fixed distance; the tester collects oil pressure at the measuring positions of the first pressure sensor and the second pressure sensor to obtain the oil level height of the transformer oil conservator and the height of the upper edge and the lower edge of the oil conservator. The measuring method is simple, interference of the false oil level can be effectively eliminated, and the overhaul efficiency and quality are improved; through the two sensors, the liquid density does not affect the measurement of the liquid level height, and the measurement accuracy is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of transformer oil level detection, in particular to a transformer oil conservator oil level measurement system. Background technique [0002] During the long-term use of the transformer oil conservator oil level gauge, there may be mechanical jams or abnormal capsules, resulting in false oil levels, which have a great impact on safe production. In the actual production process, the oil level is mainly judged by infrared temperature measurement, but sometimes the difference between the oil temperature and the ambient temperature is not obvious, and the actual oil level cannot be accurately judged. If accurate measurement is needed, the U-shaped tube method is often used to determine the oil level on site. This method requires the inspector to hold the oil tube to climb to the position of the oil conservator for measurement. When the transformer is running with electricity, this method has a greater risk of e...

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Problems solved by technology

Although the pressure inside the liquid is only related to the density and depth of the liquid, due to the different types of transformer oil in the tested transformer and the different oil temperature during the test, the density of the oil will be different; the altitude of the test point is different, and the location There will also be a slight difference in the acceleration of gravity; the difference in oil temperature caused by the different transformer loads during the test will lead to changes in the density of the oil, so the accuracy of the test results obtained by using this method is greatly reduced

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