The operating environment of distribution lines is poor and the failure rate is high. Power outages often occur due to lightning strikes, external damage, insulation damage, etc. Fault troubleshooting is time-consuming and laborious, seriously affecting the user's high-quality electricity experience. This scheme monitors the power frequency voltage, current, and high-frequency fault traveling waves of the power line, and adopts advanced traveling wave detection technology to achieve functions such as monitoring the discharge of insulation hazards in distribution lines, precise positioning of fault towers, and perfectly solve the problem of selecting and accurately locating common grounding faults.

The monitoring terminal monitors the line traveling wave and power frequency signal data in real time and online, collects, preprocesses and edge computing the data through the collection unit, and sends the data encrypted to the distribution automation master station to realize load monitoring, ground fault selection, fault precise positioning, and insulation hidden danger early warning and other functions. The diagnosis results are displayed in two ways: web and SMS.

l Main technical indicators

Fault positioning accuracy: ≤ ± 200m

Reliability of fault interval positioning: ≥ 95%

Accurate fault locations accuracy: ≥ 90%

Lightning fault identification accuracy: ≥ 90%

Grounding wire selection accuracy: ≥ 90%

Insulation hazard monitoring accuracy: ≥ 90%

Power supply method: coupling power supply+solar power supply+backup power supply

l Applicable scope

Suitable for various voltage levels of 6-20kV in distribution networks, it is widely used in long and high fault rate frequency stop and jump lines, as well as lines with strong fault concealment, difficult troubleshooting, and complex operating environments. It enhances the ability of early warning and precise positioning of distribution network lines.