Distributed fault diagnosis system for transmission line

When the transmission line operates outdoors, it is very vulnerable to tripping accidents due to the influence of various natural factors such as lightning, pollution, animals and plants, wind and galloping, icing and so on. Every line fault will damage insulators, conductors and other facilities, leaving potential safety hazards for system operation. Therefore, it is an important work for line operation and maintenance to find the fault point timely and accurately and analyze the fault cause clearly.

故障巡線圖

The transmission line distributed fault diagnosis system collects the line traveling wave waveform data from the fault monitoring terminal installed on the conductor, uploads it wirelessly to the central station for analysis and diagnosis, and the diagnosis results are automatically sent to the line operation and maintenance personnel.

Function 1: fault localization discrimination

The distributed monitoring mode can be flexibly installed at the localization boundary point and the outlet of substation / converter station, which can realize more reliable fault localization identification and station / line fault identification.

Function 2: accurate location of line fault

The longer the transmission distance of fault traveling wave in the line, the more serious the waveform attenuation and distortion, and the greater the positioning error. One group of "distributed monitoring terminals" is installed at an interval of 20 ~ 30 km. The traveling wave signal is directly collected near the high-voltage side, with high waveform authenticity and reliability and accurate automatic positioning results.

Function 3: T-connection and overhead cable mixed frame line positioning

A monitoring terminal is installed at the near t contact end of each t-wire to convert the complex line structure into a simple line for fault location.

The monitoring terminal shall be installed at the dividing point of cable and overhead line, and the overhead line and cable line shall be segmented for fault location.

Fault traveling wave contains a lot of fault information. By analyzing the waveform characteristics, it can identify lightning and non lightning, shielding and counterattack in lightning fault, wind deviation, floating objects, tree barriers, pollution flashover and other faults in non lightning fault.