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Partial discharge ultrasonic signal and atlas identification system and method

A partial discharge and discharge signal technology, which is applied in the direction of testing dielectric strength and using acoustic measurement to test, can solve the problems of inability to detect and judge the discharge amount of partial discharge and discharge fault status, so as to improve detection efficiency and accuracy The effect of improving the detection accuracy

Active Publication Date: 2020-05-15
GUANGDONG POWER GRID CO LTD +1
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  • Description
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing partial discharge detection of cable joints and terminals, which are easily affected by interference signals, and cannot detect and judge the discharge amount and discharge fault state of partial discharge, and provide a partial discharge ultrasonic signal and Spectrum recognition system

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  • Partial discharge ultrasonic signal and atlas identification system and method
  • Partial discharge ultrasonic signal and atlas identification system and method
  • Partial discharge ultrasonic signal and atlas identification system and method

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no. 1 example

[0055] like figure 1 Shown is the first embodiment of a partial discharge ultrasonic signal and spectrum identification system of the present invention. A partial discharge ultrasonic signal and spectrum recognition system, which includes an ultrasonic sensor 1, a signal acquisition box and a diagnostic analyzer, the ultrasonic sensor and the signal acquisition box are connected through a coaxial cable 2, and the signal acquisition box and the diagnostic analyzer are connected through a USB transmission line 3 connect.

[0056] Among them, the sampling frequency f of the signal acquisition box s is 10MSa / s, so the number of sampling points collected by the signal acquisition box per second f s 10M, the number of sampling points of the signal acquisition box in the power frequency of 50Hz is one cycle N 0 According to the calculation formula The calculation is 200000, that is, in the original signal of ultrasonic detection, every 50 Hz, the signal acquisition box collects ...

no. 2 example

[0059] A partial discharge ultrasonic signal and its spectrum identification method, the frequency f of the signal collection box s The same as the first embodiment is 10MSa / s, this embodiment adopts the AA Ultrasonic ultrasonic sensor, controls the distance between the AA Ultrasonic ultrasonic sensor and the cable joint under test at 0.4m, and performs the following steps:

[0060] Step 1, the signal acquisition box samples the signal collected by the ultrasonic sensor according to the power frequency of 50Hz as a cycle, and the number of sampling points is N 0 , the sampled points are signal points, and the data of all signal points form the original signal u, N 0 The calculation formula is

[0061] Step 2, at first, according to the known center frequency f of the cable joint under test, the center frequency of the cable joint under test in this embodiment is f=40kHz, and the cable joint under test calculated by the analytical diagnostic instrument is performing partial ...

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Abstract

The invention provides a partial discharge ultrasonic signal and atlas identification system. The partial discharge ultrasonic signal and atlas identification system comprises an ultrasonic sensor, asignal acquisition box and a diagnosis analyzer, wherein the ultrasonic sensor is connected with the signal acquisition box through a coaxial cable, and the signal acquisition box is connected with the diagnosis analyzer through a USB transmission line. The invention further provides a partial discharge ultrasonic signal and atlas identification method. The device is small in size, light in weight, easy to install on site, simple and convenient to apply and operate, and capable of detecting the discharge capacity of partial discharge of a cable connector and a terminal and judging the discharge fault state.

Description

technical field [0001] The invention relates to the technical field of ultrasonic signal analysis, and more specifically, to a partial discharge ultrasonic signal and spectrum recognition system and method thereof. Background technique [0002] With the increase of the service life of cable joints and terminals, the cable joints and terminals have been subjected to single or multiple effects of electrical stress, mechanical stress, thermal stress and environmental factors for a long time, and the dielectric strength of the insulation has gradually decreased. When there are defects in the cable joints and terminals Partial discharge will occur. For cable systems, most of the faults occur in cable joints and terminals, and partial discharge is an effective means for local defects in the insulation of cable joints and terminals. How to accurately detect this signal and judge the insulation state is the key to reliable operation of cable lines. [0003] The partial discharge ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1209
Inventor 廖雁群韦亦龙裴星宇周灏黄培专黄顺涛李迪叶宇婷赵蓬勃史筱川李剑
Owner GUANGDONG POWER GRID CO LTD
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