Why Are Wedge-shaped Tension Clamps At High Voltage Levels Easily Misdiagnosed As Flashovers?

The interference signals generated by the contact characteristics of dead end clamp overhead line under high voltage, and their confusion with flashover fault waveforms, mainly stem from the following mechanisms: dead end clamp with eye hook The tiny gaps at the contact point will generate local corona discharge under the influence of a high-voltage electric field. Although this discharge occurs in a limited location, the resulting transient current pulses, after being sampled by the instrument, may exhibit pulse characteristics similar to flashover faults.

The conductivity of the dead end loop clamp itself does not perfectly match the conductivity of the wire. The contact surface of the two different materials will form a non-uniform potential distribution. Under high voltage stress, stress concentration may occur in local areas, triggering weak discharge phenomena. These weak discharge signals, after being amplified, are easily confused with real fault signals.

From the perspective of time waveform, both micro-discharge and flashover faults at the dead end tension clamp contact point will generate pulse sequences. Although the interference pulses generated by fiber optic dead end clamp are usually small in amplitude and may have slightly different periodicity, they may still be incorrectly identified as flashover faults if the signal processing is not done properly.