Transient Earth Voltages (TEVs)
Measuring TEV emissions is a highly effective way of detecting, quantifying and locating PD activity in live assets. The importance of TEV effects (discharges of radio energy associated with PD activity) was first identified by EA Technology in the 1970s to measure ultrasonic emissions.
PD activity creates emissions in both the audible and ultrasonic ranges. The latter is by far the most valuable for early detection and measurement. The Ultra TEE and the Ultra TEV Plus employ ultrasonic sensors, in addition to TEV sensors.
Most importantly, the trigger points on instruments are precisely set to indicate critical PD activity, which is immediately alerted to the user.