Helping to highlight a hidden hazard
25 January 2013
Partial discharge arising from localised defects in insulation is the primary cause of system failure in electrical distribution equipment, accounting for up to 90% of electrical failures, according to HVMS. Sporadic in
Partial discharge refers to the electrical discharge or spark which can occur between two conducting electrodes along a section of insulation, typically in ageing cables or defective joints and terminations.
The accumulation of energy from partial discharge gradually weakens the insulation, leading to a system malfunction.
Martin Avis, operations manager, says "People are put off by what they imagine to be an expensive and time-consuming process. For most facilities, periodically carrying out a partial discharge survey is a relatively inexpensive exercise when compared to off-line testing. The sophisticated equipment we use means the test procedure is non-intrusive and does not require a power outage".
HVMS recommends annual testing, especially for critical plant.