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Prysmian Group UK


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Network Diagnostics

Network Diagnostics

For almost 100 years Prysmian Cables and Systems (formally known as Pirelli Cables) has been designing, manufacturing, installing and maintaining High Voltage and extra High Voltage Cable Systems throughout the UK and the rest of the world. Our High Voltage cable testing resources include all the test plant, technologists and test engineers our clients expect from a multi-national cable organisation.

When it comes to diagnosing problems encountered on existing power cable systems in the UK there is no other company who can claim to have greater experience that Prysmian, the company who has been designing, manufacturing, installing and maintaining pressurised fluid filled and polymeric cable systems since their introduction into the UK.

All Prysmian on site services are backed by specialist engineering, research and development departments, including a UK based high voltage laboratory.

Mobile High Voltage Testing Capabilities

Prysmian offer a Mobile, on-site High Voltage Testing service for new and existing power cable circuits and this testing service is performed with the same high degree of diligence whether the cable is supplied by Prysmian or from an alternative source.

High voltage tests are required prior to returning a cable circuit into service following replacement of major components such as cable terminations or cable joints or the diversion of an existing circuit.

Prysmian are able to perform a full range of tests on a cable circuit whether as part of fault diagnoses or routine maintenance performed in order to avoid a fault and hence forced outage occurring in the future.

Mobile Testing Facilities Include:

High Voltage Testing

  • High Voltage (HV) DC testing at voltages from 10kV to 710kV.
  • High Voltage AC Testing at voltages from 50kV to 300kV
  • Partial Discharge Monitoring on termination and joints while energised by the AC test equipment.
  • On line partial discharge monitoring of circuits on load.


Low Voltage Testing and DC Testing up to 15kV

• DC Conductor Resistance Tests
• Sheath Resistance and Continuity Checks
• Contact Resistance Measurement
• DE PE Oversheath testing at up to 12kV
• Oversheath Fault location.
• Insulation Resistance measurement
• Cable Sheath Voltage Limiter- Tests for correct operation up to 15kV.
• Cable cross bonding verification checks
• Impedance Measurements

Fluid Filled Cable Leak Detection

As part of our complete on -site cable maintenance capability Prysmian is able to offer cable fluid leak detection via our PFT solutions methodology.
PFT stands for Perfluorocarbon Tracers. These highly volatile compounds with excellent insulation properties are added to the cable fluid in minute quantities. Where the cable system fluid sealing integrity is damage the cable fluid containing the PFT tracers leaks into the cable surround and permeates through the ground. As the PFT compounds enter the free air they can be detected by use of Prysmian’s sophisticated detection equipment and hence the location of the fluid leak can be determined.

Prysmian are able to offer the complete PFT injection and detection service in addition to which Prysmian has a large fully trained site work force comprising of cable jointers, fluid mechanics engineers and test engineers available for the performance of cable maintenance work with all site operatives having been trained and certified in Prysmian’s own purpose built training school.

Partial Discharge Monitoring

In addition to partial discharge monitoring being performed during the performance of high voltage tests, Prysmian are able to offer non-contact partial discharge monitoring while equipment is in service utilising our own specially developed Prysmian Prycam partial discharge detection equipment.
The detection and analysis of partial discharge occurring while equipment is in service provides advanced warning of potential failure, enabling corrective action to be taken thus avoiding the danger and expense which could result from catastrophic equipment failure.