09 Nov 2016
November 9, 2016

Case Study: Solar Farm, UK

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Summary   A Partial Discharge Survey was carried out on all 33kV substations at High Penn Solar Farm, with IPEC’s PrecisePD, CC-TEV and AA sensors. Particular attention was paid to the RMUs and transformers. Tests showed that 7 of the 8 substations tested were free of PD. However, one substation, had high PD in the.. read more →

04 Oct 2016
October 4, 2016

Case Study: Oil Company, UK

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Summary On the 5th August, a sharp increase of Partial Discharge activity was detected on a 33kV switchgear panel by IPEC’s online PD Monitoring system, the ASM. High TEV PD signals were detected across the switchboard. Details On 9th August 2016, an on site investigation to locate the defect followed by switching operations. The PD.. read more →

Summary A small PD spike was detected by the ASM monitoring system in July 2015. IPEC kept a close eye on this and in February of 2016, it was seen to be rising. The criticality went from 0 to 100 in a very short period of time meaning a failure was imminent. Details High, and.. read more →

Summary As part of their routine preventative maintenance schedule, Saudi Electricity Company (SEC) carried out some online cable PD testing using the liona (online cable PD testing unit). Engineers found that there were very high readings for PD. With this information, the network was switched out and the cable termination was inspected. Details The examination.. read more →

Summary IPEC conducted cable mapping for the customer using the PrecisePD location and detection system. Results showed that there was PD present, this was confirmed via PD mapping techniques that placed the discharge source from the cable termination (shown right) in the secondary substation. Details A PD spot test was conducted at the primary substation.. read more →

Summary Annual reporting conducted by IPEC showed high levels of PD on cable EA4800B as detected by IPECs ASM monitoring system. The PD had a large magnitude and clear reflections so IPEC recommended that the cable should be switched out for a full investigation. Details IPEC conducted an annual data analysis report for the client,.. read more →

 Summary Partial Discharge spot testing was carried out in the 33kV substation. High TEV signals were detected across the switchboard. A PD source was identified originating from the bus bar enclosure of this panel. A switching investigation was conducted and the panel was de- energized cable box, opened and visually inspected. Upon inspection evidence of.. read more →

Summary The Middle East based State Owned Utility company use the IPEC PD-SGS instrument to test for Partial Discharge in their medium voltage Switchgear and accessories. In March 2014, high levels of discharge were detected on a Ring Main Unit using the PD-SGS and in response to this an offline investigation was carried out. Significant.. read more →

Summary Crossrail is a new 118km railway line under construction, running from Maidenhead, West of London, to Abbey Wood, East of the capital. The track will pass through 21km of twin bore tunnels, running directly under the centre of London. As the tunnels run through the centre of the city, they pass underneath many landmark.. read more →

Discharging RMUs

Summary As part of a scheduled test program, IPEC carried out PD testing on all 170 RMU switches in the distribution network on the Olympic Park. The tests were carried out in the two months prior to the start of the London 2012 Games. Five RMUs, all Lucy Type VRN2A, were found to have high.. read more →