Overhead Line Wildfire Fault Diagnosis Case
A Wildfire-Induced Fault Detected by SP3000 on 220kV Overhead Line
A 220kV Line, with a total length of 21.504 km, is equipped with SP3000 Distributed Diagnosis and Early Warning System for Transmission Lines on Towers #1 and #66.
On April 10, 2024, the SP3000 Distributed Diagnosis and Early Warning System for Transmission Lines detected an opening transient current waveform on the 220kV Line at 12:55:34. In this waveform, the fault current surged before dropping to zero, which was consistent with the power frequency characteristics expected during a line fault. As the terminals on Towers #1 and #66 recorded opposite phase angles for the short-circuit current, the system determined that a grounding short-circuit fault occurred on the 220kV Line, and the fault point was located between Towers #1 and #66.
Monitoring data recording and analysis
Transient current waveform of phase A fault tripping at Tower #1 |
Transient current waveform of phase A fault tripping at Tower #66 |
Transient current fusion diagram at both ends on 2024-04-10 12:55:34 | |
According to the waveform of the current traveling wave recorded by the system at the fault time, the current of the main wave head of the current traveling wave at the fault time rises slowly, and the wave tail duration is more than 40 microseconds, which conforms to the characteristics of non-lightning trip fault, so the system determines that this fault is a non-lightning fault. The system compares the typical characteristics of fault waveform library and conducts AI intelligent algorithm analysis, determining that the fault is suspected to be a mountain fire.Fault cause analysis
High-frequency current traveling waveform of phase A fault tripping at Tower #1 |
Line patrol conclusion: Fire and smoke were observed beneath Tower #61 of the 220kV Line. This fault was confirmed to be caused by wildfire.
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Discharge points at Towers 60-61 of Line XXX