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Measurement system control

Space Charge Measurement in Polymeric Insulation under AC Conditions Z. Xu, J. Zhao and G. Chen University of Southampton, Southampton, UK. Introduction.

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Measurement system control

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  1. Space Charge Measurement in Polymeric Insulation under AC ConditionsZ. Xu, J. Zhao and G. ChenUniversity of Southampton, Southampton, UK Introduction The space charge study under AC condition is limited because there are many factors which can affect the results such as varying magnitude of the sinusoidal voltage, charge injection/extraction due to the polarity reversal, material degradation, the measurement intervals, etc. PEA technique is already widely used in the space charge measurement. It utilises the interaction between high voltage pulse and the charge layer in the insulation to produce the acoustic pressure waves. The new system gives an essential way to examine the role of space charge in electrical aging process under AC conditions. There are two features with the improved PEA system: 1) a pulse generator with a 3kHz repetition rate is utilized to reduce the measurement time; 2)The Eclipse data acquisition system is used to achieve the high data acquisition rate, the faster acquisition the better representation of charge dynamics. Measurement system control System setup • Old system: • Mechanical switch pulse generator (500Hz, 2ns pulse width, up to 600V pulse); • GPIB card data transferring; • P.O.W control. • Improved system: • HTS transistor switch pulse generator (3kHZ, 5ns width, up to 4kV pulse); • The Eclipse signal average console( 2GHz effective sampling rate); • PCI data transferring. for DC measurement for AC Measurement Result and Discussions Results measured from the old system Results measured from the new system Results measured from the new system (ƒac=50Hz, ƒpulse=500Hz, Vpp=10kV) (decay test after DC measurement ) (ƒac=50Hz, ƒpulse=500Hz, Vpp=8kV) • 8 points can be selected (every 45°in one cycle); • 1000 averages were taken and total measurement time is 160 second; • The hetero-charge can be found next to the lower electrode area. • 60 data series data were captured in 12 seconds with 400 averages per data; • The distinctive characteristic of the new PEA system is capable of illustrating smooth changing of the charge decay. • 24 series data can be measured (every 15°in one cycle); • 80 averages were taken and total measurement time is 1second; • The similar phenomenon of hetero-charge can be found in the region close to the lower electrode. Conclusions • The high speed measurement and good resolution give more details of charge dynamic in a short period of time. • The frequency range of the AC supply is less limitation due to the better resolving ability in the new system. • The measurement time is dramatically shorted by the new system especially for the lower frequency; hundreds of averages can be achieved in one cycle. • The good phase resolution can be found for both high and low frequency applied voltage. Dr Zhiqiang Xu, zx4@ecs.soton.ac.uk University of Southampton, Highfield, Southampton, SO17 1BJ, UK Contact details :

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