Đồng hồ đo nhiệt độ cuộn dây máy biến áp lực, Hangzhou Huali BWR-04AIII, BWR-04AIII (TH)

BWR-04 series transformer winding temperature controller (hereinafter referred to as winding temperature controller) is designed for oil-immersed power transformers. It uses the "thermal simulation" method to indirectly measure the transformer winding temperature.

Transformer winding temperature T1 is the sum of the oil temperature T2 at the top of the transformer and the temperature rise △ T of the winding to oil, that is, T1 = T2 + △ T. The temperature rise of the winding to oil △ T is determined by the transformer winding current. The secondary side current of the current transformer is proportional to the winding current. The working principle of the winding temperature controller is to take out the current proportional to the load through the current transformer and adjust it by the converter. Then, the electric heating element input into the elastic element of the winding temperature controller, the heat generated by the electric heating element causes the elastic element to have an additional displacement, thereby generating a temperature indication value that is higher than the oil temperature by a temperature difference. The winding temperature controller uses this indirect method to obtain the average indication value of the winding temperature.

BWR-04 uses the additional temperature rise principle to simulate the temperature of the top layer of the transformer and the average temperature rise of the winding to the oil. The working principle is to take the current proportional to the load through the current transformer and adjust it after the power matcher. Input to the electric heating element embedded in the elastic element of the thermostat. The heat generated by the electric heating element causes the elastic element to have an additional displacement, thereby generating an additional temperature rise.

With four groups of large-capacity temperature control switches that can be freely set in the full range, which are used to start, close and output alarm signals of the cooling system.

Main Specifications

1.BWR-04 winding thermostat main technical indicators:

(1) Normal ambient temperature: (-40 ～ + 55) ℃

(2) Temperature measurement range: (0 ～ 150) ℃

(3) Indication degree: ± 3 ℃

(4) Control performance:

①Setting range: full range adjustable ②Setting degree: ± 3 ℃

③ Switching difference: 6 ± 2 ℃ ④ Rated power: AC250V / 15A   

(5) Standard set points: K1 = 55 ° C, K2 = 75 ° C, K3 = 90 ° C, K4 = 130 ° C

2.Technical index of converter:

(1) Normal ambient temperature: (-40 ～ 55) ℃