Ultrasonic planar array sensor suitable for partial discharge detection of transformer

A technology of partial discharge detection and planar array, which is applied in the direction of testing dielectric strength, etc., can solve the problems of inability to effectively detect signals on site, poor anti-electromagnetic interference ability of sensors, and low sensitivity, and achieve flexible beam control and good interference Rejection ability, effect of high signal gain

Active Publication Date: 2009-11-04
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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Problems solved by technology

However, the current ultrasonic positioning method sensor is composed of a single array element, the sensitivity is very low, and the signal cannot be effectively detected on the spot; secondly, the anti-electromagnetic interference ability of the sensor is poor, and the ultrasonic signal is often affected by factors such as propagation path, frequency, and speed. distortion

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  • Ultrasonic planar array sensor suitable for partial discharge detection of transformer
  • Ultrasonic planar array sensor suitable for partial discharge detection of transformer

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Embodiment Construction

[0013] as attached figure 1 , 2 As shown, the present invention is composed of 16 piezoelectric array elements 7 arranged in the silicone rubber filling material 9 in the stainless steel shell 8, and the 16 piezoelectric array elements 7 are respectively passed through the array element lead wire 4 and the 16-core cable 1 phase connection, and a stainless steel protective film 6 is provided at the bottom of the stainless steel shell 8 .

[0014] In the present invention, a stainless steel cover 3 with a 16-core cable 1 is arranged on the upper end of the stainless steel shell 8 , and a compression nut 2 is arranged between the 16-core cable 1 and the stainless steel cover 3 .

[0015] The ultrasonic planar array sensor of the present invention is composed of 16 piezoelectric array elements 7 (piezoelectric ceramic array elements), and the distance between the piezoelectric array elements 7 is 5 mm. Each piezoelectric array element 7 includes four major parts: a square piezoe...

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Abstract

The invention relates to an ultrasonic planar array sensor suitable for the partial discharge detection of a transformer, which comprises 16 piezoelectric matrix elements arranged in silicone rubber filling in a stainless steel casing. The piezoelectric matrix elements are respectively connected with cables through matrix element leading wires; and a stainless steel protecting film is arranged at the bottom of the piezoelectric matrix element which is below the stainless steel casing. The ultrasonic planar array sensor can be directly arranged on the outer wall of a transformer after being provided with magnetic media and is connected with a high-speed data synchronous acquisition device through 16 cables, thereby obtaining good partial discharge ultrasonic signals, forming an array model and laying a good foundation for the realization of location algorithm based on array signal treatment.

Description

technical field [0001] The invention relates to an ultrasonic plane array sensor for transformer partial discharge detection. Background technique [0002] With the development of the national economy, the requirements for the reliable operation of the power system are getting higher and higher, and the power transformer is the key equipment in the power system, and its operation reliability is directly related to the safety and stability of the power system. Statistical analysis of actual faults shows that insulation faults are the main reason affecting the normal operation of transformers, and partial discharge is an important cause of insulation faults. [0003] At present, the development of condition-based maintenance of power equipment has become an inevitable trend, and accurate localization of partial discharge not only plays an important auxiliary role in the assessment of the degree of damage of partial discharge, but also provides scientific guidance for the condi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 刘宏亮李燕青刘海峰律方成谢庆胡涛武坤
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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