Anti-interference transformer partial discharge positioning method and device based on sound pressure

Abstract

The invention discloses an anti-interference transformer partial discharge positioning method and device based on sound pressure. According to the device, whether a sound source comes from the insideof a transformer is judged by utilizing sound pressure information of internal and external sensors, and when the sound source is judged to come from the inside of the transformer, the partial discharge position is judged through the sound pressure value of the built-in sensor group. According to the method, based on a sound pressure-distance model, the occurrence position of partial discharge isroughly judged according to received information of a sound pressure sensor, a sound pressure-distance equation set is established through the position of the sensor and sound pressure information, and the partial discharge position is solved through a simulated annealing algorithm to obtain the specific position of partial discharge. The sound pressure-distance model provided by the invention ishigh in positioning precision, can resist the interference of external sound waves, and avoids the impact on positioning from the refraction and reflection of the sound waves in the transformer.

Description

technical field [0001] The invention belongs to the field of transformer partial discharge detection and positioning, in particular to an anti-interference multi-sensor positioning method based on ultrasonic sound pressure. Background technique [0002] The transformer is the key equipment of the power system, and it is also one of the most expensive equipment of the power system. When the transformer is running, the inside of the transformer is in a strong electric field environment. When the electric field strength in a local area of ​​the insulator reaches the breakdown field strength, discharge will occur in this area. Partial discharge generally does not cause penetrating breakdown of insulation, but it can cause local damage to media (especially organic dielectrics). If partial discharge exists for a long time, it may cause damage to the electrical strength of the insulation device under certain conditions. Therefore, real-time online monitoring of transformers is ve...

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Problems solved by technology

[0004] (1) There is no unified formula for solving the sound wave propagation velocity in the transformer, the complex structure in the transformer, the sound wave propagation speed in different acoustic media are different, and the multiple refraction and reflection of ultrasonic waves all cause positioning difficulties;

[0005] (2) In the current time-distance model using ultrasonic positioning, the measurement time is at the millisecond level, which requires relatively high requirements for the sensor time measurement system, which increases the positioning cost and may also cause large positioning errors.

[0006] (3) The current built-in ultrasonic sensor cannot solve the problem of interference caused by external ultrasonic waves passing into the transformer

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