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how we are measuring the winding temperature of the
transformer?
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Answer Posted / vishal shah
hello Mr. V Ram
Windin Temp. Can be measured with the help of Inbuilt-
Thermal Image type WTI (Winding Temp. 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.
logon to www.scientificcontrols.com for further details
regarding OTI & WTI
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