Drivepipe local discharge electrified detection device based on directional antenna array

Abstract

The invention discloses a drivepipe local discharge electrified detection device based on a directional antenna array. An electromagnetic wave signal radiated by local discharge is detected by virtue of the directional antenna array, and then is converted into a voltage signal so as to be output; a signal conditioner is used for receiving the voltage signal output by the directional antenna array, eliminating a received electromagnetic wave interference signal, amplifying the voltage signal and improving the signal-to-noise ratio; a high-speed signal collector is used for performing analog-to-digital conversion on the signal output by the signal conditioner and realizing the collection, storage and display of the digital signal. According to the device disclosed by the invention, a detection antenna is distributed in a safe region on the ground, so that the safety and reliability are high, and meanwhile, the sensor installation problem in the prior art is solved; the directional antenna array is adopted for detecting a drivepipe local discharge signal, and is combined with the signal conditioner, so that the drivepipe local discharge signal receiving gain is improved, meanwhile the drivepipe peripheral electromagnetic interference receiving gain is reduced, and strong interference on drivepipe local discharge detection due to a severe electromagnetic environment of transformer substation is overcome.

Description

technical field [0001] The invention relates to the technical field of electrification detection, in particular to a bushing partial discharge electrification detection device based on a directional antenna array. Background technique [0002] Power bushings with a voltage level of 110kV and above are the main power equipment in substations. Once an insulation failure occurs, it often leads to power outages in substations and even local areas, which has a huge negative impact on the national economy and social stability. Partial discharge is the early sign and important cause of internal insulation failure of these equipment. Timely detection of partial discharge phenomenon, determination of discharge location and elimination of insulation defects causing partial discharge are effective measures to avoid internal insulation failure of equipment. With the improvement of power supply reliability requirements in economic and social development and the development of condition-b...

AI Technical Summary

Problems solved by technology

The existing methods are not effective when used to detect partial discharge faults inside the bushing, mainly in the following aspects: (1) Sensors cannot be installed, and safety and reliability are low

The installation position of these electrical equipment is high, close to the high-voltage line, and the safety of personnel and equipment during the test work is not guaranteed.

(2) Strong electromagnetic interference

Due to the extremely harsh electromagnetic environment in the substation, these methods are strongly disturbed, making it impossible to extract the partial discharge signal

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