Monitoring partial discharges
First Claim
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1. Apparatus for monitoring a discharge in an insulating medium comprising:
- waveform generator means for generating a periodic time varying exciting waveform for an insulating medium and for generating a short duration trigger pulse with a predetermined duration shorter than a period of the exciting waveform and a predetermined timing relative to the exciting waveform for initiating a discharge responsive to said trigger pulse in said insulating medium; and
coupling means for applying the exciting waveform and the trigger pulse to a sample of said insulating medium for initiating discharge activity in the medium in response to the trigger pulse and substantially simultaneously with the occurrence of the trigger pulse at said predetermined timing relative to the exciting waveform.
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Abstract
A method of initiating and monitoring partial discharges in an insulating medium is disclosed. Apparatus for performing the method is also disclosed. A relatively low frequency time varying exciting waveform is applied to a sample of an insulating medium. A trigger pulse of short duration is superimposed on the exciting waveform to initiate partial discharge activity in the sample. The apparatus includes a trigger pulse generator with a synchronizing circuit which provides a pre trigger signal for an oscilloscope, allowing the resultant partial discharge activity to be monitored.
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Citations
21 Claims
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1. Apparatus for monitoring a discharge in an insulating medium comprising:
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waveform generator means for generating a periodic time varying exciting waveform for an insulating medium and for generating a short duration trigger pulse with a predetermined duration shorter than a period of the exciting waveform and a predetermined timing relative to the exciting waveform for initiating a discharge responsive to said trigger pulse in said insulating medium; and coupling means for applying the exciting waveform and the trigger pulse to a sample of said insulating medium for initiating discharge activity in the medium in response to the trigger pulse and substantially simultaneously with the occurrence of the trigger pulse at said predetermined timing relative to the exciting waveform. - View Dependent Claims (2, 3, 4, 5)
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6. Apparatus for monitoring a partial discharge in an insulating medium comprising:
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waveform generator means for generating a time varying exciting waveform to an insulating medium and for generating a trigger pulse for initiating a partial discharge in said insulating medium; and coupling means for applying the exciting waveform and the trigger pulse to a sample of said insulating medium so that partial discharge activity is initiated in the medium substantially simultaneously with the occurrence of the trigger pulse. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification