Method for measuring oil level of transformer oil conservator based on ultrasonic detection

Abstract

The invention discloses a method for measuring an oil level of a transformer oil conservator based on ultrasonic detection. The method adopts an ultrasonic probe, a signal acquisition module, a signalprocessing module and a display module. During measurement, the ultrasonic probe is attached to the outer wall of the oil conservator and moves up and down in the height direction of the oil conservator, ultrasonic longitudinal waves emitted from the ultrasonic probe can penetrate through the metal wall thickness of the oil conservator and the insulating oil in the oil conservator, the ultrasoniclongitudinal waves generate reflection signals on penetrated different medium interfaces, and the reflection signals are received by means of the signal acquisition module. The signal processing module controls the display module to indicate a number of measured reflection signal times according to a number of reflection signal times measured at a position of the oil conservator at the corresponding height. The oil level of the oil conservator is positioned between the heights of the oil conservator at which a primary reflection signal and a secondary reflection signal can be received. The method can be used for detecting the internal oil level of the transformer oil conservator rapidly and precisely under the condition that the transformer is not shut down, is stable in measurement and has high repeatability.

Description

technical field [0001] The invention relates to the technical field of power system testing, in particular to a method for measuring the oil level of a transformer oil conservator based on ultrasonic detection. Background technique [0002] As the key equipment of the power system, the transformer's operational reliability is closely related to the safety and stability of the power system. Impregnating insulating materials in transformer oil can not only improve the internal insulation strength of the transformer, but also avoid moisture erosion. Therefore, the amount of insulating oil inside the transformer not only affects the insulation level of the transformer equipment, but also affects the service life of the insulating material inside the transformer and the heat dissipation capacity during operation. If the oil level of the oil conservator is too high, when the transformer is fully loaded or overloaded, it will cause faults such as transformer oil spillage; trip. A...

AI Technical Summary

Problems solved by technology

If the oil level of the oil conservator is too high, when the transformer is fully loaded or overloaded, it will cause faults such as transformer oil spillage; trip

At the same time, the phenomenon of false oil level caused by the bending and breaking of the connecting rod of the oil gauge, the falling off of the gauge pointer, and failure also greatly increases the possibility of misjudgment by traditional manual visual inspection when the oil level is abnormal.

Therefore, how to quickly and accurately measure the oil level inside the transformer oil conservator and keep the oil level in the transformer oil conservator within the normal value range has become a problem and challenge that has plagued engineers and technicians for a long time.

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