Lightsource – HV Condition Assessment
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30 July 2020
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EA Technology
UltraTEV Plus² identifies multiple cable termination issues at new solar farm
Lightsource is a global leader in the funding, development and long-term operation of solar photovoltaic (PV) projects with 2GW under management and the largest in-house O&M fleet in Europe.
Recently, during routine maintenance, technicians performed a non-intrusive Partial Discharge (PD) survey using the UltraTEV® Plus². The instrument immediately highlighted high PD readings in the substation switchgear cells.
Investigation
The substation was isolated in order to allow access to the cable compartment. Upon removal of the cable termination cover, the origin of the high PD reading was not immediately apparent.
Detailed findings
The Extensible Connector was dismantled across all three phases to further investigate the case. Irregularities were noticed on L1.
UltraTEV® Plus² reading showing the fault at site
Immediate on-screen diagnosis
Partial Discharge identified
Results
The issue was rectified and the UltraTEV® Plus² used to confirm that the PD source was eliminated.
Benefits
If UltraTEV® Plus² had not been used, the issue would have gone unnoticed and it may have resulted in flash over rendering the switchgear unusable and the cable requiring re-termination.
The use of UltraTEV® Plus² helped to prevent loss of generation income.
Additional Partial Discharge Detection and Advanced Analytics
The UltraTEV® Plus2 has the ability to measure PD in cables and cable accessories using Radio Frequency Current Transformers (RFCT) as well as established techniques for surface PD (Ultrasonic) detection and internal PD (TEV) detection on switchgear.
The new advanced analytics allow PD measurements to be examined more precisely in real time or after the inspection:
- Phase plots – helps to differentiate between noise patterns and real PD
- Waveform capture – examines amplitude of individual pulses, for PD Characteristics
- Histograms – assists with identification of multiple sources of PD and noise discrimination
Interpreting the condition of your electrical assets
The UltraTEV® Plus2 has been designed to make asset inspections easy. The instrument helps the operator understand what the results mean by interpreting the data and displays clear information and instructions.
Range of Kits and Uses
The UltraTEV® Plus2 is a multifunctional instrument that can be used to rapidly survey the condition of whole substations and check that working environments are safe. Changes in PD activity levels can be compared between assets and analysed over time, providing a clear indication of when further investigation is required. To meet your need we offer the following instrument kits:
Kit 1
- Metal clad Switchgear
Standard kit for Switchgear condition assessment includes headphones & battery chargers.
Kit 2
- Metal clad Switchgear
- Cables
This kit has additional external sensors and includes an RFCT, allowing quick and easy condition assessment of your cables*
Kit 3
- Metal clad Switchgear
- Cables
- Outdoor assets
With the UltraDish™ option included in Kit 3, PD activity can be measured in overhead assets, offering a comprehensive condition assessment package
*Access to cable earth required.