Introduction

Model BWY—804 Transformer Thermoregulator is a new generation product derived from Model BWY—802/803 one in compliance with JB/T 6302-92 Standard of Pressure-type Thermoregulator For Transformer issued by The National Machinery Ministry. It is suitable for taking measurement and control of oil temperature in a medium-sized or Large-sized transformer.

The BWY—804 has the following new points:

1.  Wide scope of application

To meet the need of intelligent control in an unattended transformer house, the BWY—804 can output following controlling signals

(1)  Pt100 platinum resistance signal；

(2)  4-20mA direct current signal；

(3)  RS232/RS485 communication interface。

2. Four sets of switch, which can be set within a whole span, are employed to respectively control over the transformer cooling system, overheating alarming and tripping, etc.

Main technical parameters

1.  Normal operating conditions：（-30~+55）℃

2.  Measuring range:（0-150）℃

3.  Measurement accuracy：grade 2.0

4.  Bulb and mounting screw size: φ14×150mm;M27×2

5.  Control function：

(1)  setting range: adjustable within the whole span

(2)  setting accuracy：±4℃

(3)  switch difference：6±2℃

(4)  rated power：AC 220V/5A

(5)  standard set point：K1＝55℃  K2＝65℃  K3＝80℃  K4＝120℃

6.  Ouput: Pt100 platinum resistance signal；DC4-20mA, 0-5V or 1-5V signal;

7.  Shielding grade：IP55