EPRO PR6423/008-110+CON041 Serial control module

EPRO PR6423/008-110+CON041 Serial control module

The wide-band measuring equipments are to much effected from environmental influences where as narrow-band ones is effected considerably little. The partial discharge measurements of the transformer is made during the induced voltage test. Test and measuring circuit, test duration and voltage levels, and evaluation criterions are given section 7, induced overvoltage test.

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OPERATION TESTS ON ON-LOAD TAP CHANGER 

After the tap-changer is fully assembled on the transformer, the following tests are performed at (with the exception of clause b) 100% of the rated auxiliary supply voltage; 

a) 8 complete operating cycles with the transformer not energised. 

b) 1 complete operating cycle with the transformer not energised, with 85% of the rated auxiliary supply voltage. 

c) 1 complete operating cycle with the transformer energised at rated voltage and frequency at no-load. 

d) 10 times tap-changer operations with ±2 steps on either side of the principal tappings with as for as possible, the rated current of the transformer, with one winding short-circuited.

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