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> Controller > BWR—04 Transformer winding thermoregulator
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Item Name：BWR—04 Transformer winding thermoregulator
Model Number：BWR—04
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Transformer winding thermoregulator is specially designed for oil-immersed transformer, which can indirectly measure the winding temperature by thermal simulation method.
Let T1 present the temperature of transformer winding and it is the sum of T2 and △T, i.e. T1＝T2+△T, where, T2 is the oil temperature in upper part of the transformer, and △T is the winding temperature rise relative to the oil temperature. The △T depends on the winding current and the secondary current of the current transformer (CT) is in proportion to the winding current. The thermoregulator works in following. Principle: The current from the CT, which is in proportion to the load, is first adjusted via a converter, and then flows through the heating element embedded in the elastic component; the heat produced by the heating element leads to an additional displacement of the elastic component, and thus a temperature indicated value higher than the oil temperature. By this way, the thermoregulator can obtain an average indicated value of the winding temperature.
1.BWR-04Ⅲ series winding temperature indicator：
(1) Indicate the temperature of transformer winding.
(2)Afford four sets of switch (AC250V/15A)，which can be set within a whole span, are employed to respectively control over the transformer cooling system, overheating alarming and tripping, etc.
(3) Output function
1）Output DC(4~20)mA electricity signal to be the input of the digital display thermometer which is in the controlling room.
2）Output DC(4~20)mA electricity，（power supply AC220V）
3）Output Pt100 platinum resistance
Let T1 present the temperature of transformer winding and it is the sum of T2 and △T, i.e. T1＝T2+△T, where, T2 is the oil temperature in upper part of the transformer, and △T is the winding temperature rise relative to the oil temperature. The △T depends on the winding current and the secondary current of the current transformer (CT) is in proportion to the winding current. The thermoregulator works in following. Principle: The current from the CT, which is in proportion to the load, is first adjusted via a converter, and then flows through the heating element embedded in the elastic component; the heat produced by the heating element leads to an additional displacement of the elastic component, and thus a temperature indicated value higher than the oil temperature. By this way, the thermoregulator can obtain an average indicated value of the winding temperature.
1.BWR-04Ⅲ series winding temperature indicator：
(1) Indicate the temperature of transformer winding.
(2)Afford four sets of switch (AC250V/15A)，which can be set within a whole span, are employed to respectively control over the transformer cooling system, overheating alarming and tripping, etc.
(3) Output function
1）Output DC(4~20)mA electricity signal to be the input of the digital display thermometer which is in the controlling room.
2）Output DC(4~20)mA electricity，（power supply AC220V）
3）Output Pt100 platinum resistance
