According to China Electric Power Development Report 2024, China continues to improve the network structure and build a strong power grid "artery". By the end of 2023, the length of 220 kV and above transmission lines in China was about 920,000 kilometers, an increase of about 69.1% from 2013.

Transmission lines extend for thousands of miles, crossing mountains, rivers, railroads, highways and other areas, the operating environment is complex, once the fault investigation is very difficult. The traditional traveling wave ranging technology has a long distance traveling wave attenuation serious problem resulting in low fault location accuracy, the effect is not ideal. To address this situation, we propose a non-contact detection technology based on Transmission Line Distributed Ranging System (TLDRS). strong>Distributed Fault Location Device for Transmission LinesDX-WPS100-GZ01/FJ provides effective technical support for rapid fault location and fault cause analysis of long-distance transmission lines and intelligent substation transmission lines.

Unit Composition and Installation

Transmission line non-contact fault location device consists of magnetic measurement sensor, data acquisition module, main control module, communication module and power module, etc. The monitoring terminal is arranged on the tower below the three-phase conductor, which can be installed without power failure.

The monitoring center is wirelessly connected to the monitoring terminal, which carries out corresponding data processing analysis and storage of the collected signals, realizes accurate identification of traveling wave characteristics and calculation of fault distance, and sends the fault diagnosis results to the user's cell phone terminal for real-time viewing.

Fault Location Principle

The device through the non-contact sensing technology, real-time access to overhead transmission line faults in the three-phase conductor in the surrounding space generated by the industrial frequency magnetic field signal, space electric field signal, traveling wave magnetic field signal and traveling wave electric field signal; at the same time, the use of high-precision GPS timing technology to ensure that the clock synchronization between the heterodyne measurement equipment, combined with the travelling wave ranging technology to achieve the grounding electrode line fault location, the location of the error of no more than 20 meters.

Fault type identification and early warning

Fault type identification includes flashover, lightning, short-circuit, broken wire, etc.

Through the statistical analysis of transient faults, early warning to prevent the occurrence of tripping faults; can be a statistical analysis of lightning strikes section, for lightning protection and the effect of providing data reference, and in the long run can also be achieved on the tripping faults of the self-recognition.

Transmission line non Contact fault location devicecan effectively improve the operational reliability of power grid equipment, to avoid the serious impacts and losses on the social economy and residents' life due to the prolonged blackout accidents, the economic and social benefits are The economic and social benefits are significant.