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The surface discharge injected current were measured by using High Frequency Current Transformer (HFCT). It is observed that the rise time of the current pulse is about 800ps. In addition, the rise time of the current pulses has not altered in copper sulphide (CuS) diffused Oil Impregnated Pressboard (OIP) material, but the width of the current signal has increased with the increase in the amount...
The main aim of this work has been to test the long term durability of insulation materials subjected to surface partial discharges (PD), as a part of a larger study on the performance of materials used in subsea high voltage apparatus. Electrical equipment used in subsea installations are subjected to high hydrostatic pressures and seawater, often combined with high temperatures and even reactive...
Partial discharge (PD) in a void reflects degradation of insulating material and, therefore, is utilized for insulation diagnosis. Although it is well known that PD pattern changes with voltage application, it is not clear how the pattern change is related to material degradation or how it is related to final breakdown. We simultaneously observed PD characteristics and light emission from partial...
Subsea installations on the sea bed at great depth require insulation materials with high reliability. Failures of such installations introduce difficult maintenance and high costs. This involves the need of reliable (insulation) materials and testing of such. The purpose of our activity is to build a test facility that can test both well-known and new insulation material samples as well as high voltage...
Presently, polyimide film is applied widely in turn-to turn insulation and turn to ground insulation of inverter-fed traction motors as one kind of special project plastic film. In this paper, the measurement of partial discharge is done on nanometer hybrid polyimide film and non nanometer polyimide film with different frequency and different rise time under high-frequency square impulse. Some parameters...
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