Gassing of insulating oil is a common occurrence in an operating transformer. However, each gas has a story to tell. In terms of risk, each gas has a personality. The oil (a complex hydrocarbon), when stressed with heat or electrical activity will break down into simpler gases. These are also known as hydrogen, carbon monoxide, […]
When is it appropriate to apply online dissolved gas analysis monitoring (DGA)? It depends on the risk. In this TechTalk we will explore how to decide whether or not to apply online DGA.
Transformers are an expensive purchase. Most asset owners want the most of the transformer asset (the best return on investment). Condition monitoring is an essential tool to achieve this. The results give us an indication of the health of the unit, and that something is wrong internally and also to some degree the ageing of […]
In any condition monitoring instance, one needs to be able to trust the data! In all cases, the measurement or the taking of data is the beginning of the process. If this is not done correctly it can distort the data and result in incorrect decisions being made.
Transformers are commonly manufactured using cellulosic-based insulation materials which have an affinity for absorbing moisture – it’s in their DNA … Furthermore, mineral oil (specifically) is severely impacted by moisture which will significantly reduce dielectric strength. Moisture can be present in either a dissolved or free-suspension state. Both conditions will have disastrous effects on the […]
The Rotating Machine Monitor is a continuous partial discharge monitor, which monitors, stores, and correlates operating dynamics. All industry accepted partial discharge graphical results and IEC defined quantities are measured, analysed and reported.
Condition-based assessments and monitoring form an integral part of the maintenance strategy for medium voltage switchgear.
Partial discharge (PD) measurements have long been used to assess the condition of the electrical insulation in motors and generators rated 3.3 kV and above. There are many ways to measure PD during the normal service of the motor or generator. The drawback with many methods of measuring PD in the stator windings is that […]
Electrical engineers should carefully consider the best practice to ensure the reliability of the plant and safety of the personnel during and after the lockdown period.
Electrical discharges (ED) in MV power circuits are (1) Partial Discharges (PD) and (2) Partial Arcing (PA). Partial Arcing is a term coined by Martec to explain multiple findings which exhibit some common characteristics of PD.