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In transformer how measure the winding temperature ?
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Answer Posted / mohamed
how to select the CT ratio for WTI
the answer :
SCIENTIFIC CONTROLS Mechanical Instruments are incorporates
proven design features acquired from many years of
experience in providing Temperature Indicators/Controllers
for Power & Distribution Transformers.
Oil Temperature Indicator: The Oil Temperature Indicator
(OTI) measures the Top oil Temperature. It is used for
control and protection for all transformers.
Winding Temperature Indicator: The Winding is the component
with highest temperature within the transformer and, above
all, the one subject to the fastest temperature increase as
the load increases. Thus to have total control of the
temperature parameter within transformer, the temperature
of the winding as well as top oil, must be measured. An
indirect system is used to measure winding temperature,
since it is dangerous to place a sensor close to winding
due to the high voltage. The indirect measurement is done
by means of a Built-in Thermal Image.
Winding Temperature Indicator is equipped with a specially
designed Heater which is placed around the operating
bellows through which passes a current proportional to the
current passing through the transformer winding subject to
a given load. Winding Temperature is measured by connecting
the CT Secondary of the Transformer through a shunt
resistor inside the Winding Temperature Indicator to the
Heater Coil around the operating Bellows. It is possible to
adjust gradient by means of Shunt Resistor.
In this way the value of the winding temperature indicated
by the instrument will be equal to the one planned by the
transformer manufacturer for a given transformer load.
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