Transient Earth Voltage (TEV) Sensor

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On-line PD measurements of air insulated and solid insulated switchgear as been around for over 30 years using TEV (Transient Earth Voltage) sensors. These are small Radio Frequency (RF) Aerials which detect the high frequency PD pulses emanating from the discharge site in the switchgear. These pulses tend to have pulse widths of a few tens of nanoseconds, and act as a good medium for nonintrusive PD detection in switchgear. Detection of these pulses can also be used for localisation of the PD site. The Transient Earth Voltage (TEV) Sensor is recommended for this application. The Sensor is magnetically latched to the earthed, metal-casing of the switchgear panel and can therefore be used for on-line testing.

TEV Sensor and Application