How much deviation is allowed from the calculated value ( three phase dry transformer Rated voltage 11000 / 415 volts, Rated Power 2000KVA)? Kindly also mention the reference of Standard.
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Junior Member
Posted December 2, 2017
How much deviation is allowed from the calculated value ( three phase dry transformer Rated voltage 11000 / 415 volts, Rated Power 2000KVA)? Kindly also mention the reference of Standard.
NETA Level III
Posted December 3, 2017
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The standard deviation as defined by ANSI/IEEE C57.12.00-2006, Section 9.1 states that results should be within 0.5% of nameplate markings, with rated voltage applied to one winding. The TTR with accuracy of 0.1% is accepted as a referee.
- Power Equipment Maintenance and Testing, Paul Gill
ANSI/NETA standards also state that TTR results should be within 0.5%
Member
Posted January 18, 2018
In the NETA-MTS and ATS under electrical test results it says, "Turns-ratio test results should not deviate more than one-half percent from either the adjacent coils or the calculated ratio." Page 32 for both books.Originally Posted by shamimkhan
