We have over 20 years experience in the electricity transmission and distribution industry. Our high voltage maintenance expertise covers condition monitoring, asset management, protection, harmonics, radio frequency emissions from power system plant, numeric protection, high voltage discharges, power system simulation, fault location, analysis of faulty insulation, data interpretation and data visualisation.

Objectives: to validate the feasibility of monitoring PD in wind turbine transformers, and determine and solve any additional factors unique to the wind turbine transformer.

Arcing faults on distribution systems give rise to electromagnetic emissions which can be detected using wideband radio receiving equipment over distances of up to 5 km. Engineers from Elimpus are entering the trial phase of an EIC funded project with Scottish Power to develop a system (RAFL) to utilise the reception of arcing fault radio signals to locate the position of the arc.

On-load tap changers (OLTCs) are one of the most problematic components of power (the only moving part) and is a common failure block (>30%) in transformers. There are numerous tap-changer operations (average 5000 per year for network transformer and 2 to 3 changeovers per day) that create stresses and so use of DGA as tool for advance indication of problems is problematic in discerning between normal gassing behaviour and abnormal behaviour, e.g. from excessive contact wear and damage to the diverter switch.