In Transformer testing at Shop test we normally test for
vector group, open ckt.,short ckt. but what are the other
test performed for transformer once it reaches at site.For
e.g:if the transformer is dry having rating 1000KVA?
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Answer Posted / guest
1. Insulation Resistance Measurement
a . For LT systems, use only 500V or 1000V Megger
b. For MV & HV systems, use 2500V or 5000V Megger
c. Remove Earth from Transformer neutral
2. Winding Resistance Measurement
R-N AND r-n
Y-N y-n
B-N b-n
3. Magnetic Current Test
Applied Voltage : RY YB BR
Measured Current : R Y B
4. Magnetic Balance Test
5. Vector Group Confirmation.
6 . Short Circuit Test and Differential Stability.
7 . REF Stability Test
8. Cooler Circuits.
9. Auxilliary Protection Circuits
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Dear Sir/Madam, I have one questions we have three steam turbines and one Gas turbine and our industry linked with the public network, we have protection system one of the protection is reverse power we can export just four MW only i would like to ask about how to calculate the reverse power. Thank you in advance best regards
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