2388-MANUL-V10.00.00-UTP2 Operating Manual
Page 49 of 74
4. Detecting Partial Discharge using the UltraTEV
®
Plus²
Due to the tri-sensor capability, the UTP2 is able to detect Partial Discharge activity on the surface of insulation
using Ultrasonic detection, internal to insulation by measuring TEV signals and in cables and cable accessories
using the HFCT accessory.
This section covers how to use the UTP2 to detect PD activity using the three sensor technologies.
4.1 TEV Measurement
TEV measurements are performed using the TEV sensor embedded into the front face of the instrument.
4.1.1 Background Noise
Electromagnetic signals from sources outside the switchgear can also produce voltages on the outside of the
switchgear. These electromagnetic sources can come from a multitude of sources such as overhead line
insulators, transformer bushings and strong radio signals.
These sources will produce equivalent signals on metalwork which is not electrically connected to the
switchgear such as metal substation doors or fencing. Measuring the interference levels on these surfaces
before taking readings from the switchgear will help allow identification of PD over background noise.
4.1.2 Measuring TEV
Switch on the UTP2 and wait until home menu is displayed. Press the TEV icon on the home menu then choose
which TEV display is required. The ‘Interpretation’ display is recommended for first pass with the advanced
functionality of the other modes being utilised to further inform the user once a signal is detected.
To take a measurement, hold the TEV sensor squarely against the metalwork of the asset under test as shown
overleaf. Any readings will be displayed on the screen with the interpretation message adjusted to take account
of the reading’s amplitude and pulses per cycle. Please note that the readings will not remain on the screen
once the TEV sensor has been removed from the metalwork.
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