Basler BE1-60, Instruction Manual

9170700990 Rev D 

BE1-60 Functional Description 

3-1 

SECTION 3 

•

 FUNCTIONAL DESCRIPTION 

INTRODUCTION 

BE1-60 Voltage Balance Relay functions and operating features are illustrated in Figure 3-1 and 
described in the following paragraphs. 

1A

2A

1B

2B

1C

2C

FULL-WAVE

RECTIFIER AND

INTEGRATOR

DIFFERENTIAL

AMPLIFIER

LIMIT

COMPARATOR

LIMIT

 SETTING

FULL-WAVE

RECTIFIER AND

INTEGRATOR

DIFFERENTIAL

AMPLIFIER

LIMIT

COMPARATOR

FULL-WAVE

RECTIFIER AND

INTEGRATOR

DIFFERENTIAL

AMPLIFIER

LIMIT

COMPARATOR

FULL-WAVE

RECTIFIER AND

INTEGRATOR

DIFFERENTIAL

AMPLIFIER

LIMIT

COMPARATOR

FULL-WAVE

RECTIFIER AND

INTEGRATOR

DIFFERENTIAL

AMPLIFIER

LIMIT

COMPARATOR

FULL-WAVE

RECTIFIER AND

INTEGRATOR

DIFFERENTIAL

AMPLIFIER

LIMIT

COMPARATOR

V

2A

-V

1A

>0

Δ

V

V

1A

-V

2A

>0

V

2B

-V

1B

>0

V

1B

-V

2B

>0

V

2C

-V

1C

>0

V

1c

-V

2C

>0

0

0.75

0

0.75

TARGET

TARGET

AUX.

CIRCUIT 1

AUX.

CIRCUIT 2

POWER

SUPPLY

POWER

SUPPLY

SENSOR

POWER

SUPPLY
STATUS

TO INTERNAL CIRCUITRY

POWER

Δ

V > LIMIT SETTING

D2817-17

07-14-98

Figure 3-1. BE1-60 Function Block Diagram 

STEP-DOWN TRANSFORMERS 

Voltage received from the power system potential transformers is applied to sensing transformers within 
the BE1-60 relay. The voltage is stepped down to appropriate levels and supplied to full-wave rectifier 
circuits within the relay. 

FULL-WAVE RECTIFIERS AND INTEGRATORS 

Outputs from the step-down transformers are full-wave rectified and then integrated. The integrator 
circuits establish a dc voltage that represents the magnitude of the associated sensing input. 

DIFFERENTIAL AMPLIFIERS 

The representative dc voltage from each integrator is applied to a pair of differential amplifiers. Each 
differential amplifier pair is dedicated to a particular phase of the monitored system. The pair determines 
which monitored circuit has the lower voltage (for that phase) and the difference in magnitude. For 
example, if phase A of Circuit 1 is lower than phase A of Circuit 2, then V

2A

 – V

1A

 = V.