Gradient temperature on 3Phase transformer core with staggered yoke with 90 T-joint
Date
2009-06-20Author
Ismail, Daut, Prof. Dr.
Dina Maizana, MT
M., Ahmad
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Show full item recordAbstract
This paper describes the result of
measurement of localised temperature rise on
100kVA 3phase distribution transformer
assembled with 90o T-joint and mitred lap corner
joint with stagger yoke with overlap length of
10mm. The measurement involves the initial
temperature and last temperature after 20 minutes
experiment. The temperature rises have been
measured using no load test by arrays of
thermistor on M5 (CGO) grades material of
transformer core laminations. The localised
temperature rise at the outer 90o T-joint is 0.075
oC/minutes and rises to be 0.095 oC/minutes at the
inner 90o T-joint when the transformer core
energized 1.5 T 50Hz. A small amount of flux
deviation from the rolling direction occurs at the
overlap.
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