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A lock-in technique for PD measurement during impulse tests
A. Palani, V. Jayashankar
Published in
2007
Volume: 14
   
Issue: 5
Pages: 1278 - 1284
Abstract
A method is proposed for recognizing PD events within a winding during impulse tests using a lock-in amplifier technique. The resonant frequencies of the winding serve as the basis of selection of the lock-in amplifier reference frequencies. It is implemented with a virtual instrument and validated with an independent stand-alone lock-in amplifier. A physical model of a winding with discrete elements is used to demonstrate the results. A theoretical basis for the instrument is established using an 'abc' model of PD along with a linear discrete winding model. The influence of location of PD is also addressed. The method will provide online recognition of PD during the impulse test and can be adapted for onsite measurements. © 2007 IEEE.
About the journal
JournalIEEE Transactions on Dielectrics and Electrical Insulation
ISSN10709878
Open AccessNo
Concepts (9)
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    Electric windings
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    IMPULSE TESTING
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    Mathematical models
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    Natural frequencies
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    Power amplifiers
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    LOCK-IN AMPLIFIERS
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    Partial discharge
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    VIRTUAL INSTRUMENTS
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    Electric discharges