Transformer partial discharge super high frequency detector

Abstract

A kind of transformer part turns on electricity an extremely high examination device, belonging to electricity equipments to insulate monitor technique realm. The invention mainly includes the pole sub- antenna of a set of tube list to spread a feeling machine and enlarges a filter, high speed numeral to collect machine and calculator. Set the tube list pole sub- antenna of the invention spreads a feeling machine to be flapped son, metals set a tube by the metals radiation and deliver line and metals scale board and N type of the electric cable with stalk to deal with contact to constitute. Because the invention has a higher intelligent degree and believes a ratio, can examine clear and accurate transformer occurrence part turn on electricity the extremely high electromagnetic wave produced signal, can availably to transform internal occurrence of part on electricity to carry on on-line monitor, so it can be used for the oil immerse type transformer with 110-500 kV extensively.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment insulation monitoring, in particular to a transformer partial discharge ultra-high frequency (UHF) detection device. Background technique [0002] The transformer is an important equipment in the power system, and its stable operation is of great significance to the entire power system. In transformer faults, insulation faults account for a high proportion, and partial discharges will occur before insulation faults occur, that is, partial discharges are a precursor to the deterioration of the transformer's internal insulation. Therefore, through online monitoring of transformer partial discharges, transformers can be detected in time. Internal latent faults can avoid sudden insulation faults, which is conducive to the safe operation of the power system. [0003] At present, my country's 110kV and above large-scale transformers mainly use oil-immersed transformers. According to stati...

AI Technical Summary

Problems solved by technology

The oil drain valve is located at the bottom of the transformer box, far away from the high-voltage end. The installation of the sensor will basically not damage the distribution of the electric field inside the transformer, so it is a more suitable location for the sensor to be installed, but the size of the oil drain valve is small. In other words, its size is limited. If the size is reduced, the performance of the sensor will be reduced, which is not conducive to the detection of partial discharge signals.

Chinese patent No. ZL02277287.1 discloses an on-line partial discharge monitoring device for transformers. The ultra-high frequency sensor is installed through the oil discharge valve, and the center frequency of the sensor is adjustable, which brings some positive effects to the detection of partial discharge. However, due to its maximum The detection frequency band is only 80MHz, and the detected partial discharge signal is weak, which is not conducive to the subsequent processing of the signal and affects the sensitivity and accuracy of detection

Since the installation position of the sensor in this device has given up the oil drain valve, it is installed at the flange. Although this avoids reducing the performance of the sensor, it has given up the best installation position, which may bring problems to the operation of the transformer. hidden danger; in addition, although the use of A / D acquisition card and detector reduces the dependence on the high acquisition system, it loses the information of the partial discharge signal to a large extent, which is not conducive to the processing and diagnosis of the signal in the subsequent stage

Images