Resistor Values; Psl For Tcs Scheme 3; Figure 253: Psl For Tcs Scheme 3 - GE MiCOM P40 Technical Manual

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supervision current is maintained through the trip path with the breaker in either state, therefore providing pre-

closing supervision.

RESISTOR VALUES

Resistors R1 and R2 are used to prevent false tripping, if the opto-input is accidentally shorted. However, unlike the

other two schemes. This scheme is dependent upon the position and value of these resistors. Removing them

would result in incomplete trip circuit monitoring. The table below shows the resistor values and voltage settings

required for satisfactory operation.

Trip Circuit Voltage

This Scheme is not compatible with Trip Circuit voltages of less than 48 V.

*NC stands for Normally Closed.

P446SV-TM-EN-1

Opto Voltage Setting with R1

Resistor R1 & R2 (ohms)

Chapter 17 - Supervision

Resistor R3 (ohms)

*Output Relay