Press the Cable PD icon on the home menu and proceed to press on the Measure option.
The screen will display a bar graph of the measured PD values in picocoulombs (pC). To
obtain a further insight into the discharge activity on a cable, select the ‘Phase Plot’ option
on the Cable PD screen. This screen provides a phase resolved reading of Cable PD activity
within the cable under test.
8.3 Ultrasonic Measurement
The UltraTEV Plus² is equipped with a built-in ultrasonic sensor which can be used to detect
the acoustic emissions of surface partial discharge activity. External ultrasonic sensors are
also available to use with the UltraTEV Plus² allowing use in outdoor compounds, on sealed
assets or in hard to reach places. When taking airborne ultrasonic readings the sensor
should not touch the asset or plant being investigated.
8.3.1 Measuring Ultrasonic
Switch on the UltraTEV Plus² and wait until home menu is displayed. Proceed to plug in the
supplied Headphones; select the Ultrasonic icon on the main menu. The screen will now
display a phase resolved plot of ultrasonic activity.
Ultrasonic activity above the background level may be significant. Genuine discharge can
be identified by a crackling sound (like a sizzling frying pan) in the headphones or by phase
related groups on phase plot. Further confidence of a detection can be obtained by the
classification algorithm output displayed on the top left of the screen.
8.3.2 Measuring Ultrasonic with the UltraDish Accessory
The UltraDish provides a means of detecting discharge sources at a distance. It comprises
a transparent parabolic reflector that focuses the ultrasonic sound on to a sensor mounted
at the focus point of the reflector. The UltraDish gives an effective increase in gain
compared to the built in sensor allowing discharges to be detected at much greater
distances such as insulator strings on overhead assets.
To use an UltraDish the connector must be plugged in to the Ultrasonic sensor input on
the side of the UltraTEV Plus². The UltraDish is aimed at the point of interest with either
the optical sight or by switching on the laser pointer with the button on the handle.
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