BWR-04 series transformer winding temperature indicator Introduction: The transformer winding temperature indicator (hereinafter referred to as the winding temperature indicator) is specifically designed for oil-immersed power transformers, which can indirectly measure the winding temperature using the "thermal simulation" method. Let T1 represent the temperature of the transformer winding, which is T2 and △ T, i.e. T1=T2+△ T, where T2 is the upper oil temperature of the transformer, △ T is the increase in winding temperature relative to oil temperature. This △ T depends on the winding current and the current of the secondary current transformer (CT) being proportional to the winding current. The working principle of the temperature indicator is as follows: the current and load of the current transformer are first adjusted through a converter, and then flow through the embedded heating element in the elastic component; The heat generated by the heating element causes the displacement of additional elastic components, resulting in a temperature indication value higher than the oil temperature. In this way, the temperature indicator can obtain the average indicated winding temperature. When indicating the temperature of the transformer winding, the BWR-04 series winding temperature indicator light can provide up to six sets of switches (AC250V/15A) for control, overheating alarm, and tripping of the transformer cooling system; This instrument can output (4-20) mA passive current signal (or active (4-20) mA, Pt100 platinum resistance signal) as the input signal for the digital display thermometer in the control cabin. Technical parameters: 1. Main technical parameters of BWR-04 winding temperature indicator: (1) Normal working conditions: (-40-+60) ℃, relative humidity ≤ 95% (2) Measurement range: 0-150C (or user specified) (3) Indicating accuracy: Level 1.5 (suitable for capillary tubes with a length of 6m) (4) Control performance:
① Setting range: adjustable within the working range 2 Setting accuracy: ± 2 ℃ 3 switch difference: 6 ± 2 ℃ 4. Rated power: AC250V/15A, DC250V/3A (5) Standard setting point: K1=55 ℃ K2=75 ℃ K3=90 ℃ K4=130 ℃ (6) Converter: ① Type: built-in integration ② Input current: (0.6-5) A ③ Main Technical parameters: see Table 1 for details (7) Protection performance: IP55 (8) Output: Pt100, DC (4-20) mA (9) Installation dimensions: see Figure 1 for details 2. Main technical specifications of XMT-288FC digital thermometer: (1) Normal working conditions: -10-5 ℃ (2) Measurement range: 0-150 ℃ (or user specified) (3) Input signal: Pt100, DC (4-20) mA (4) Indication accuracy: 1.0 level (5) Resolution: 0. 1C (6) Control performance
① Control method: upper limit contact
② Setting range: adjustable within the working range 3 contact capacity: AC250V, 3A (7) Output signal: DC (4-20) mA, DC (0-5) V (RS232, RS485 communication interface or other customized output signals) (8) Working power supply: AC/DC (100-260) V, frequency (50-60) Hz (9) Opening size: 152+1 * 76+1mm; Boundary dimension: 160 * 80 * 135mm
Introduction: The transformer winding temperature indicator (hereinafter referred to as the winding temperature indicator) is specifically designed for oil-immersed power transformers, which can indirectly measure the winding temperature using the "thermal simulation" method. Let T1 represent the temperature of the transformer winding, which is T2 and △ T, i.e. T1=T2+△ T, where T2 is the upper oil temperature of the transformer, △ T is the increase in winding temperature relative to oil temperature. This △ T depends on the winding current and the current of the secondary current transformer (CT) being proportional to the winding current. The working principle of the temperature indicator is as follows: the current and load of the current transformer are first adjusted through a converter, and then flow through the embedded heating element in the elastic component; The heat generated by the heating element causes the displacement of additional elastic components, resulting in a temperature indication value higher than the oil temperature. In this way, the temperature indicator can obtain the average indicated winding temperature. When indicating the temperature of the transformer winding, the BWR-04 series winding temperature indicator light can provide up to six sets of switches (AC250V/15A) for control, overheating alarm, and tripping of the transformer cooling system; This instrument can output (4-20) mA passive current signal (or active (4-20) mA, Pt100 platinum resistance signal) as the input signal for the digital display thermometer in the control cabin.
