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A power system with high voltage transmission is necessary to transmit a large amount of electrical energy from generating stations to consumers. High voltage transformers are widely used in electric power systems. Oil insulation is important component in the transformers. The oil serves as electrical insulation and coolant in transformers. The integrity of the oil insulation is important factor in...
Corona discharge in oil is one of a number of important defects that may exist in a power transformer. This paper investigates the corona in oil from a needle-plane geometry. Different aspect ratios of the geometry are investigated as well as the temperature dependence from 25 to 100°C. The corona discharges are measured both in time domain with oscilloscopes and as phase resolved patterns. By using...
Soft silicone gels are frequently used to encapsulate IGBT power electronics modules. The role of the gel is to protect components and connections against moisture, pollution, and also to avoid partial discharges. The objective of this paper is to study PDs occurring on ceramic AlN metallised substrates, embedded in silicone gel, with a special attention paid to the behaviour at low temperature (down...
The working life of electrical machines is primary affected by the insulation system quality. Diagnostics methods help to understand the momentary state of insulation and to avoid the possible damage or electrical breakdown of machines through the repair or insulation rewinding. Partial discharges testing belongs to one of the high applicable test method of insulating materials within electrical machines...
This paper deals with the influence of external factors (temperatures from -200degC to 200degC, radiation by high speed neutrons and thermal neutrons in controlled dosage) and working conditions on the stability of GFSA characteristics. Under well controlled laboratory conditions measurements of DC and pulse breakdown voltages were performed. During these measurements, following parameters were varied:...
In this paper, it is investigated the effect of the cross linked polyethylene (XLPE) insulators was examined according to the temperature into XLPE which was used as the insulation of the electric power cable for the ultra-high voltage. In order to investigate the effect of changing tree phenomenon according to the temperature on the electrical conduction mechanism, a partial discharge experiment...
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