EPCOS B43455-T5208-T2 Multifunctional I/O module
The circuit that is given at figure 8.2 is a very useful method called BUSHING TAP. The calibration of the circuit has to be made before starting the measuring. For this reason first of all a calibration generator is needed. Calibration generator is producing a q0 charge, with a definite value. It is connected parallel to the test object. The q0 charge, which is produced by calibrator, is observed from the measuring equipment. This operationmust be repeated for all terminals of the transformer.
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After the transformer has been energised
the value of partial discharge that was observed from the measuring equipment, is multiplied by the correction factor ( K ) of every terminal and the apparent partial discharge value is found.The wide-band or narrow-band measuring equipment’s are used for partial discharge measurement. Wide-band consists of the frequency spectrum from 40 kHz up to several 100 kHz, and narrow-band frequency spectrum is between 9÷10 kHz.
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