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1. Introduction

Safe operation and working life of power transformers depends largely on the safety and reliability of transformer winding. If the temperature of transformer winding exceed the temperature which insulation withstand, it will damage the insulation. This is one of the most important reasons that transformers cannot operate normally.

  BWD series temperature controller of dry transformer (Referred to as temperature controller) is an intelligent controller designed especially for safe operation of dry transformer. The temperature controller features adoption of single chip computer technology and utilization of the platinum thermo-resistors embedded in the winding of the dry transformer for detection and display of temperature rise of the transformer winding. It can start or stop the cooling fan automatically for forced air cooling of winding and control over-temperature alarm and over-temperature tripping output so that the transformer will be operated safely.

2. Technical Indicators 

2.1 Range of measurement: -30.0℃～240.0℃

2.2 Accuracy of measurement: Grade of accuracy: Grade 1(Grade 0.5 for temperature controller, Grade B for sensor) 

                     Resolution 0.1℃

2.3 Operating conditions: Room temperature: -20℃～+55℃ 

                   Relative humidity: < 95% (25℃) 

                   Power frequency: 50Hz or 60Hz (±2Hz)  

                   Power voltage: AC220V (+10%, -15%)

                             Or AC380V (+10%, -15%)

(Power voltage should be indicated before placing order, otherwise AC220V shall govern)                

2.4 Power consumption of temperature controller: ≤8W                

2.5 Execution standard: Production standard: JB/T7631-2016 Electronic Thermo-controllers for Transformers

   Certification passed: ISO9001:2008 Quality Management Systems-requirements

   Test passed: IEC61000-4:2002 International Standard and GB/T17626-2008 Standard for Electromagnetic Compatibility Test and Measuring Technology

2.6 Relay contact output: 

  Capacity of contact of fan: 6A/250VAC(Cosφ=0.4)(Single-phase fan)

                        9A/380VAC(Cosφ=0.4)(Three-phase fan)

  Control of output capacity: 5A/250VAC; 5A/30VDC (Resistance)

                       5A/220VDC (Resistance)(Special customized)

2.7 Overall dimension of temperature controller: 

       320+1mm×260+1mm×80+1mm(H´W´D)

     Or 370+1mm×300+1mm×110+1mm(H´W´D)

   Installation size of temperature controller: 280mm×160mm(H´W)

2.8 Protection class: IP40  

Protection class of panel: IP54

3. Type and Classification of Function