EPRO PR6424/003-030 Relay card

EPRO PR6424/003-030 Relay card

To measure the impulse currents, non-inductive, ohmic resistances are used. Usually its value varies from 0,1 Ω to 20 Ω. Coaxial cables are used to transmit the measurement signals to peak-value voltmeter and to the oscilloscope. If the application of chopped-wave is foreseen; a system which chopped the wave is added to the impulse circuit. In modern impulse voltage circuits, this is usually a “ Multiple chopping device ”.

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In beginning impulse voltage 

test is started with a value of 50 percent of the test voltage which wave form is determined by the oscillograme. After obtaining the form which is acceptable according to the the standards, first a “ Reference Impulse ” which has the magnitude of 50% percent of the test voltage, is applied, then “ Full Impulse ” which has a value of 100% are applied at certain times which the standards are stated. The magnitudes of applied voltages are determined numerically on the peak-value voltmeter through a voltage divider. Besides, the time-change of the applied voltage, and the changes of the current leaking from the winding under test to the earth or the capacitive current leaking from the windings which are under test, to the earth; are detected with photographs by means of an oscilloscope.

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