Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1990-11-07
1992-09-22
Harvey, Jack B.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324546, G01R 3112
Patent
active
051500590
ABSTRACT:
The present invention is a method and apparatus for testing the condition of insulating systems. The insulating system is charged up by a dc voltage and then discharged. The return voltage appearing after discharge is assessed and the quotient of the peak value of the return voltage and the charging voltage is measured. According to the invention the charging is done in time-interval of 10.sup.-3 -10.sup.4 seconds, with a ratio of charging to discharging time in the range of 0.1-100. The measurement cycle is repeated several times with other charging/discharging times, but with the same charge/discharge ratio. The resulting spectrum of values may be compared with a reference whereby the state of the insulating system can be assessed. An apparatus for implementing the method the apparatus for implementing the said method consists of a high voltage source, a switching circuit and voltage measuring units.
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Bognar Alajos
Csepes Gusztav
Hamos Istvan
B & C Diagnostics Kft.
Harvey Jack B.
Regan Maura K.
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