BWDK-3208BE Temperature Controller of Dry BWDK-3208BE

BWDK-3208BE Temperature Controller of Dry BWDK-3208BE

The thermostat is a new generation of temperature controller designed especially for air-cooled dry-type transformers. It uses advanced computer control technology and data storage technology. The thermostat has strong anti-jamming capability for adoption of anti-jamming measures combination of hardware and software. The thermostat can keep the transformers operated safely and is an important device to protect dry-type transformers. Parameter-setting is easy achieved by several key set, and parameters will not lose after power off. The thermostat has a function of 'black box', it can record and check the instantaneous temperature of the winding of transformer before power failure. The thermostat is characterized by simple operation, easy installation and maintenance. Production standard: JB/T7631-2016 Electronic temperature indicators for transformers. Certification passed: ISO9001: Quality Management Systems-requirements.

Introduction

Installation instructions (inserted installation)

Type

Function

BWDK-3208BE

Three-phase circular measurement; Fault, over-temper alarm and over-temper trip output; 6-channel fan control function and phase failure protection; Three 4~20mA analogue current output and RS485 serial communication function.

BWDK-4208BE

Three-phase windings and iron core circular measurement; Fault, over-temper alarm, over-temper trip and iron core alarm output; 6-channel fan control function and phase failure protection; Four 4~20mA analogue current output and RS485 serial communication function.

Technical Indicators

1. Range of measurement: -30.0℃～240.0℃

2. Grade of accuracy: Grade 1 (Grade 0.5 for thermostat, Grade B for sensor)

3. Resolution : 0.1℃

4. Room temperature: -40℃～+60℃

5. Power voltage: AC220V±10% ( 50Hz/60Hz )

6. Power consumption: 8W

7. Sensor: Three (Four) Pt100 platinum thermo-resistors, three PTC Thermistor

8. Control of output capacity: 10A/220VAC (Resistance)

9. Weight: ＜3Kg

10. Overall dimension of thermostat: 260mm×200mm×85mm (High×Width×Deep)

11. Analogue output: 4~20mA current

12. Digital output: RS485 serial communication interface

Features

1. Three-phase winding (and iron core temperature) circular display or maximum value display

function.

2.Fan control function. Auto start and stop fan according to the set value so that dry-type transformers

could work safely at normal temperatures. Fan will start when the highest temperature among any three

phases exceeds the set value of fan-start, or start the fan manually. At the same time, the panel 'fan'

indicator light.

2.1 Thermostat can connect 1~6 fans or do not connect any. If there are fans, when fans start, the

corresponding led indicator turn green.

2.2 If fan phase failure occurs, the corresponding led indicator turn red with alarm. If the number of

connected fans is less than 6, the LED for the unconnected fans will not be on. If the number of external

fans is less than 6, set the number of fans to be the actual number of fans, and the fan must be connected

from No.1.

3. Over temperature alarm function. When the highest temperature among any three phases exceeds the

set value of over-temp alarm, the led indicator 'Over-temp' turn light with alarm and the

terminal(14, 15, 16) outputs a switch signal.

4. Over temperature trip function. When the highest temperature among any three phases exceeds the set

value of over-temp trip, the led indicator 'Trip' turn light with alarm and the terminal(11, 12, 13)

outputs a switch signal. When the highest coil temp has increased the preset limit for 6 seconds, it will send

an alarm signal.

4.1 If the PTC sensor has been used, the Auto-Power-Cut output terminals will not activate unless both

kinds of sensors, the PT100 and PTC, have detected the coils’ temperature meets the preset limit, thus

increasing the reliability of Power-Cut function.

5. Thermostat fault alarm function. When there is fault in thermostat, the led indicator 'Fault' turn light

with alarm and the terminal (17, 18, 19) outputs a switch signal.

5.1 Different colors represent different phase thermostat fault: Yellow represents phase A, green

represents phase B, red represents phase C. If not light, the thermostat works normally.

5.2 –oP- represents open circuit of sensor, -oL- represents short circuit of sensor in the temperature

display area.

5.3 When there is a phase or two-phase fault in the thermostat, the fan is controlled according to the

temperature signal of the sensor. When the three-phase sensor fails, the fan is turned on immediately.

6. Parameter setting function. You can set the stop and start fan value, over-temp alarm value,

over-temp trip value, the timing of fan, communication address, baud rate and the number of fan

control by directly through the key. Those setting value will save when power off.

7. Manually control the fan function. Start fan manually by pressing the key 'Manual'. This feature is

also available as a fun test function.

8. Start the fan with a timer function. 0 to 255 hours can be arbitrarily set (If 0 is set, it means no timer

function). After regular time arrives, the fan will start 1 minute. 24 hours is set by our factory.

9. With 'Black box' function. The thermostats automatically record instantaneous temperature of the three

-phase windings before power failure. In order to avoid the power down and change the memory data again,

if the temperature below 80℃ before power down, not to refresh the original record temperature.

10. History highest temperature. Recording the highest temperature of each phase since power on, to

prepare query.

Operating Instructions

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1. First power: The thermostat is displaying temperature of phase A, B, C (d iron core circular

measurement/ambient temperature) circularly when power on and the self-test is completed. If the

thermostat is not connected with the sensor, the fan automatically starts.

2. Maximum value and circular value display switching: The thermostat will enter maximum value

state by pressing the key 'Highest/+' under circular displaying status and the indicator 'Highest' lights, then

it displays the highest temperature of the 3 windings; Vice versa.

3. Start fan manually: The thermostat will start the fan manually by pressing the key 'Manual' under

normal working mode and the indicator ' Manual' lights ; Vice versa.

4. Power-down data query function: Pressing the key 'Inquire/-' continuously, the thermostat is

displaying the temperature of phase A, B, C sequentially (d iron core circular measurement/ambient temperature) before power down and historical maximum temperature of phase A, B, C.

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