Transmission lines are characterized by many points, long surfaces and long lines, and due to the conductors are exposed outdoors for a long time, they are susceptible to the influence of bird damage, tree damage and human factors, which produce external damage problems and affect the safe and stable operation of power grids. For this reason, our company for transmission line fault finding difficult, developed the DX-WPS100-GZ01 type . 14px;">Distributed Traveling Wave Ranging (Fault Location) Device, which effectively strengthens the efficiency of transmission line fault inspection and troubleshooting.
Distributed traveling wave ranging (fault location) device is applicable to the monitoring of AC and DC overhead transmission lines with voltage levels of 35kV and above, realizing fault on-line section location and fault ranging. The system adopts distributed monitoring technology, through the distribution of fault monitoring terminals installed on the overhead transmission line, to realize the high frequency sampling and recording of fault traveling wave, refracted traveling wave, and other transmission line faults before, during and after the frequency and transient signals. The main station utilizes the strategy of combining zone positioning and traveling wave ranging to quickly and accurately analyze the type of fault (lightning strike/non-lightning strike, bypassing strike/counterstrike) and to realize fault point location with an accuracy of 100 meters.
Application Case Diagram:
The main functions are as follows:
I. Data collection
The monitoring device can automatically identify the fault traveling wave current signal and fault industrial frequency current signal, collect and store the traveling wave current and industrial frequency current waveform data, and automatically record the clock signal granted by BeiDou high-precision time synchronization module.
II. Data communications
It can send the recorded data to the backstage center station wirelessly in real time and accurately, and supports all-network 4G/5G/WIFI wireless transmission.
III. Back-office access
Supporting complete backstage software to realize fault diagnosis function, which can be accessed to the South China Grid, State Grid and other provincial electric power company operation and inspection intelligent analysis and control system.
IV. Fault localization
The fault interval and fault location can be localized after a line fault.
Reliability of fault interval localization: >99
Positioning error ≤100m
V. Fault Identification
According to the fault waveform characteristics can identify lightning strike/non-lightning strike faults, lightning strike to identify bypass/backlash faults.
Lightning strike and non-lightning strike fault identification accuracy: > 95
Counterattack recognition accuracy: ≥90%.
VI. User interaction
The background software can send monitoring and diagnostic results by SMS;
WEB can query the history of monitoring of faults, working conditions, etc;
Supports the import/export function of data reports.
