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High Voltage Partial Discharge Ltd (HVPD)
HVPD are experts in the on-line partial discharge (OLPD) condition monitoring of in-service, medium voltage (MV) and high voltage (HV) networks.
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High Voltage Partial Discharge Ltd (HVPD) are experts in On-line Partial Discharge (OLPD) testing and monitoring. Our technology is used in a number of industries for condition monitoring and to support Condition Based Maintenance (CBM) asset management schemes for medium, high and extrahigh voltage (MV, HV, EHV) networks. Our continued investment in research and development, supported with the UK government (DECC, TSB and RGF) have helped us to develop world leading test and monitoring technology. Our outstanding achievements were recognised by two Queen’s Awards for Enterprise 2014, in the categories of Innovation and International Trade. With offices and partners around the world we are focused on providing the highest quality service for our customers.

Industries and application

Oil and Gas

HVPD test and monitor assets for customers both onshore and offshore in upstream, midstream and downstream sectors. We specialise in remote OLPD continuous monitoring of HV Ex/ATEX motors and in monitoring of complete HV networks, including power cables, switchgear, transformers and rotating machines.

Data Centres

The efficient performance of data centres relies on a dependable electrical power supply including HV substations, standby generators, and Uninterruptable Power Supply (UPS) systems. We support our customers by testing and monitoring mission critical assets, and helping to prevent unplanned outages.


With over 15 years of experience in offshore and onshore cable PD test services, we are committed to developing cost-beneficial solutions for our renewable energy customers. Our services include commissioning and OLPD testing and monitoring of MV and HV cables, and Time Domain Reflectometry (TDR) testing to provide TDR signatures of cables to aid location of cable faults.

Power Generation

We supply condition-based assessment of MV and HV networks in the power generation industry with the main focus on OLPD monitoring of large generators, motors and transformers.

Transmission & Distribution

Our equipment is used to test and monitor all types of MV, HV and EHV plant including switchgear, power cables, transformers, CTs/VTs, and in both public utilities and private networks. Our condition monitoring solutions have been developed in conjunction with a number of UK utilities.


HVPD provide non-invasive OLPD testing and monitoring on oil-drilling vessels, LNG vessels, FPSOs and cruise ships. Our condition monitoring systems developed specifically for the shipping industry meet the requirements of smaller contained MV networks, helping to ensure reliability of the vessel’s generators and drive/pump motors, cables, switchgear and transformers.

4-Phase Asset Management


Refers to a quick, look-see scan of the plant to identify any partial discharge using the PDS Insight™ and PDS Insight™ Machines. These are simple to use handheld test units suitable for rapid preliminary scanning of a large population of assets with a test time of ten seconds per asset. PDS Insight™ testing is typically performed in the switchroom where personnel can test an entire switchboard for PD quickly and easily using transient earth voltage (TEV) sensors and ultrasonic/airborne acoustic probes. The PDS Insight™ Machines can be additionally used for testing rotating machines using pre-installed high voltage coupling capacitors (HVCC). Both of these handheld test units provide data for the OLPD Manager™ app for trending.

The diagnostic phase typically involves a 6 channel test unit, the HVPD Kronos™Spot Tester, with synchronous data acquisition on 6 or more channels. This type of technology allows more detailed testing to be undertaken where OLPD data is collected from all three phases at once (to within 10 ns on all channels on advanced test units). This enables discharge type, phase-to-phase or phase-to-earth, to be ascertained. Typical diagnostic spot test times range from around ten minutes to one hour per asset with detailed data analysis and reports often required upon completion of the tests. If OLPD activity is detected, then the diagnostic testing is extended to locate the source of the PD site(s) within the circuit under test. In the case of HV cables, OLPD cable mapping is carried out to locate the source(s) of PD activity along the cable circuit.

An alternative solution for the permanent continuous OLPD monitoring (Phase 4) is to install permanent HFCT or HVCCsensors and perform periodic continuous OLPD monitoring with HVPD Kronos® Portable unit. This solution provides most of the advantages of the permanent OLPD continuous monitoring when a lower budget is available whilst allowing for multiple substations to be monitored sequentially, typically for 1 month a time.

The HVPD Kronos® Permanent Monitor provides continuous OLPD monitoring technology providing an early warning against HV insulation failure through developing insulation faults. Continuous OLPD monitoring systems detect operational and environmental variations in PD activity and provide the best warning against HV insulation failure. This early warning needs to provide sufficient time to schedule a planned, preventative maintenance intervention at minimum cost and maximum convenience for the operator, whilst avoiding what can be a very costly, unplanned outage. The condition benchmarking of OLPD data also plays a critical factor in effective condition-based maintenance, whereby the condition monitoring data obtained from the HV asset under test is uploaded to the HVPD OLPD Measurements Database© where it can be compared with similar types of plant to identify the worst-performing circuits.

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