EWAL ACTUATOR 92S-06442VFVM Multiplexer switch card

EWAL ACTUATOR 92S-06442VFVM Multiplexer switch card

Test is first performed with a decreased voltage which is 50 % of the test voltage, then it is carried out with full value impulse voltages the number of which is stated in the standards. The peak value of the voltage is measured by an impulse voltmeter. The change of voltage waveform and winding current are determined by means of an oscilloscope. The faults which may occur during the test are determined by comparison of current and voltage ocillographic records. The sudden collapses (flashover) in the voltage and abnormal sound effects show the damage in the insulation of the transformer. The variation in the voltage waveform and the increase of sound due magnetic saturation of the core must not be considered as reasons for any fault.

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MEASUREMENT OF ACOUSTIC SOUND LEVEL 

The purpose of the sound level measurement is to check that, the sound level of the transformer meets the specification requirements, or quaranteed values given by the transformer manufacturer. The principal sound sources in transformers are : a) core sound : caused by magnetostriction and inter-laminar magnetic forces. b) load sound : caused by electromagnetic forces in the windings, tank wall, and magnetic shields. c) cooling equipment sound : caused by fans and pumps.

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