HVPD Case Studies

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A mining operator in Australia, with a large number of remote HV substations, required a cost effective, condition monitoring (CM) strategy to identify, locate and monitor partial discharge (PD) activity on their network.
 

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In 2011, a large oil refinery in Eurasia requested an on-line partial discharge (OLPD) monitoring technology to monitor the HV stator insulation condition of in-service Ex/ATEX 10kV motors located in hazardous gas zones at their facility.
 

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An offshore windfarm operator in the UK requested on-line partial discharge (OLPD) commissioning
testing and then monitoring of new 400 kV 200m grid connection cables. Diagnostic OLPD testing during the 24-hour HV commissioning test was followed by continuous 24/7 OLPD monitoring.
 

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A European utility company required a solution to continuously monitor on-line partial discharge (OLPD)
activity within an in-service 275/20 kV, 225 MVA transformer, which has a high criticality in the HV network as it supplies a 150 MVAr HV reactor bank with an outage cost of £100k a week.
 

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A paper mill customer in North America required a solution for implementing condition based maintenance to their medium voltage (MV) network and requested on-line partial discharge (OLPD) testing on complete in-service 13.8 kV transformer circuits (including switchgear).
 

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A metropolitan light rail system customer requested on-line partial discharge (OLPD) testing and cable mapping (location) on their 33 kV cable network. The testing was requested further to the network suffering (3) cable faults that had led to unplanned outages and disruption across the rail network.
 

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An offshore oil production platform in the UK North Sea requested on-line partial discharge (OLPD) testing on their offshore 33 kV network, including the 33 kV subsea export cable from two (2) deep water experimental offshore wind turbines to a main oil production platform
 

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A large combined cycle gas power station operator in the UK requested HVPD’s on-line partial discharge (OLPD) testing and consultancy expertise to support a warranty claim based on a common design issue on three (3) 2.25MW 6.6kV circulating water pump motors.
 

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A gas processing facility based in the North Africa requested on-line partial discharge (OLPD) testing of the two (2) 10 kV Gas Turbine Generators and four (4) process critical 10 kV Motors that had reached 4 years of service.
 

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A UK offshore wind farm operator requested on-line partial discharge (OLPD) monitoring and cable mapping of their 33 kV landsea export cables to an offshore wind farm. OLPD monitoring and cable mapping technology was used to detect 'incipient' insulation faults for cable repair maintenance.
 

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A transmission customer recorded low Insulation Resistance (IR) readings on a 750 m, 33 kV subsea cable. The customer requested fault location to be conducted.
 
 
 

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This case study describes the development of a patent-pending technology from HVPD for the partial discharge (OLPD) monitoring insulation of variable speed drive HVAC motors located in hazardous gas zones.
 

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An oil refinery operator in Europe requested an on-line partial discharge (OLPD) diagnostic testing of all of the outdoor 110 kV cross-lined polyethylene (XLPE) transformer cable terminations at their facility. The test project was requested further to a explosive failure of one 110 kV transformer cable termination.
 

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HVPD conducted on-line partial discharge (OLPD) testing on two 10.25 kV hydro generators at customer site A, and two 11 kV motors at customer site B. The purpose of this testing was to gain baseline readings of the insulation condition and partial discharge (PD) levels.
 

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A UK pharmaceutical manufacturer requested the development of an on-line partial discharge (OLPD) test regime for their 11 kV network, including numerous 1.6 MVA, 2.0 MVA and 2.5 MVA, 11 kV – 433 V, air-cooled, dry-type (resin) transformers.
 
 

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