Technical Articles

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On-Line PD Testing of Outdoor HV Plant - Applying Experiences from 10 Years of PD Testing Indoors

CIRED, Vienna, Austria, May 2007

This paper presents some new applications of on-line PD monitoring to outdoor solid-insulated MV/HV plant such current transformers, voltage transformers and cable sealing ends.

On-Line PD Testing - Now A Field Reality

AVO/Lord Technical Conference, Christchurch, New Zealand, October 2006

This paper describes the application of a range of On-Line Partial Discharge (PD) Test Technologies suitable for the On-Line PD testing, monitoring and screening of both medium voltage (MV) and high voltage (HV) plant.

Partial Discharge Measurements and Damage to High Voltage Cables

Insucon, Birmingham, UK, May 2006

This paper details an a case at EDF Energy in London where a section of PILC cable with partial discharge activity was excavated and analysed.

Fault Location Techniques for one of the World's Longest AC Interconnector Cables

The 8th IEE International Conference on AC and DC Power Transmission, ACDC 2006, London, UK, March 2006

This paper details time-domain reflectometery (TDR) tests carried out on the 90 kV AC subsea interconnect cable between the electrical distribution system on the Isle of Man and the UK mainland power system.

MV Cable Diagnostics - Applying Online PD Testing And Monitoring

Asia Pacific Conference on MV Power Cable Technologies, Kuala Lumpur, Malaysia, September 2005

The cable fault rate in most UK electricity distribution companies has been gradually increasing over the past decade and this trend is considered to be likely to accelerate as the average 'asset age' of the cable network continues to rise.

New Methods in On-Line PD Detection for HV Plant

UHVnet, Cardiff, UK, January 2005

Partial discharge (PD) is becoming increasingly viewed as the best diagnostic for insulation, particularly for on-line measurements. Clearly this applies to insulation which exhibits and is degraded by PD activity.

PD Monitoring - A Critical Tool For Condition-Based Assessments

Transmission & Distribution World, December 2003

The United Kingdom's electricity supply industry will face a new set of challenges over the next decade as it strives to improve and maintain supply standards while minimizing operations and maintenance (O&M) costs.

An Integrated Approach To On-Line PD Monitoring And Diagnosis of MV Plant Condition For Application as A Pre-Maintenance Tool

CIRED, Barcelona, Spain, May 2003

Through the application of a combination of new PD spot-test equipment, PD location equipment and PD Diagnostics it is now possible for the MV Plant owner to systematically identify the condition of their 'critical' plant and then to constantly monitor this condition through the use of permanent, remotely-accessible on-line monitoring equipment.

Diagnostics for MV cables and Switchgear as a Tool for Effective Asset Management

CIRED, Amsterdam, Holland, June 2001

The introduction of diagnostics into the maintenance and operation of high voltage plant should show clear benefits if it is to be a useful tool in running a competitive electricity distribution company. This paper gives examples of diagnostic methods applied to London's 11kV cable network.

Some Advances in PD Monitoring for High Voltage Cables

IEE Colloquium on MV Paper Cables: Asset or Liability?, UK, April 1998

Some advances have been made recently with detection of the PD activity of medium voltage cables, using an on-line method of detection. This paper illustrates the relationship between the original VLF (very low frequency) power supply results of PD mapping in medium voltage cables, and the newer on-line monitoring methods. The on-line methods offer the possibility of scanning circuits quickly and relatively cheaply to obtain meaningful PD data for older installed cables.