Distributed Intelligent Fault Monitoring System for Transmission Line
System technical indicators
4.1 Technical indicators of the monitoring device
l Power supply mode: Inductive coupling power supply mode, line load current range: 16A～1500A;
Working hours of backup battery: ≥24h;
l Sampling frequency and clock
a) Travelling wave sampling frequency: 10 MHz;
b) Power frequency sampling frequency: 3 KHz;
c) System time accuracy: 0.1μs;
l Measuring range, accuracy and recording time
a) Traveling wave current measurement range: 5A～5kA (peak value), measurement accuracy: ≤10%
b) Continuous recording time of traveling wave current: ≥3000us;
c) Power frequency current measurement range: 10A～10kA (effective value), measurement accuracy: ≤10%
d) Continuous recording time of power frequency current: ≥500ms
l Protection level: IP66.
4.2 Technical indicators of the background software system
1) Reliability of fault location location: >99%
2) Positioning error of fault location: <300m
3) Accuracy of identification of lightning strikes and non-lightning strikes: >95%
4) Recognition accuracy rate of shielding failure and counterattack failure: >95%
