Functions of Condition Monitoring
Modern approaches to maintenance requires non-intrusive testing to identify any developing problems that could, if left undetected, lead to expensive disruptive failures.
HSS offers the following as part of a non-intrusive Condition Monitoring Service.
Partial Discharge Mapping
Partial discharge occurs when solid insulation begins to break down either through age deterioration or application problems.
This deterioration can be detected and mapped to dedicated record sheets with specially designed sensitive (TEV) instrumentation while the switchgear asset is still electrically live.
This type of first pass testing enables decisions as to whether any intrusive intervention will be required.
Used in conjunction with partial discharge detection, sophisticated cameras operating in the infrared range are capable of detecting heat sources within switchgear compartments.
Printouts of the heat pattern can be down-loaded and included as part of the overall reporting.
Battery Impedance Testing
Batteries are an essential and important part of the switchgear protection application. Faulty or defective cells can be detected with the battery still on line. This is especially useful for simple battery systems that only have an output voltmeter, as voltmeter may be more indicative of the charger output than the battery status.
As part of the application of Condition Monitoring the general condition of the substation is included as part of any final report. Typical of the data recorded is humidity and temperature at the time and date of the non-intrusive testing.
Other important recorded factors will be presence of any standing water in cable trenches, defective lighting, defective locks and any general building damage.
This would all be supported by photographic evidence.
Standards and Application
All tests offered by HSS as part of a Condition Monitoring package are to British Standards.
They can be applied as a one off occurrence or can form part of an overall ongoing programme of activities to all types and makes of switchgear, irrespective of asset age.