Figure 146: Tcs Scheme; Figure 147: Psl For Tcs Scheme; Figure 148: Tcs Scheme; Figure 149: Psl For Tcs Scheme 2 - GE P4A Technical Manual

P54A/B/C/E
+ve
Trip Output Relay
V01215

Figure 148: TCS Scheme 2

When the breaker is closed, supervision current passes through opto input 1 and the trip coil. When the breaker is
open current flows through opto input 2 and the trip coil. No supervision of the trip path is provided whilst the
breaker is open. Any fault in the trip path will only be detected on CB closing, after a 400 ms delay.
5.2.1 RESISTOR VALUES
Optional resistors R1 and R2 can be added to prevent tripping of the CB if either opto-input is shorted. The table
below shows the appropriate resistor value and voltage setting for this scheme.
Trip Circuit Voltage
48/54
110/125
220/250
Warning:
This Scheme is not compatible with Trip Circuit voltages of less than 48 V.
5.2.2 PSL FOR TCS SCHEME 2
Opto Input 1
Opto Input 2
*NC stands for Normally Closed.

Figure 149: PSL for TCS Scheme 2

In TCS scheme 2, both opto-inputs must be low before a trip circuit fail alarm is given.
5.3 TRIP CIRCUIT SUPERVISION SCHEME 3
TCS Scheme 3 is designed to provide supervision of the trip coil with the breaker open or closed. It provides pre-
closing supervision of the trip path. Since only one opto-input is used, this scheme is not compatible with latched
trip contacts. If you require CB status monitoring, further opto-inputs must be used.
P54xMED-TM-EN-1
Trip path
R1 Opto-input 1
R2
Opto-input 2
Opto Voltage Setting with R1 Fitted
24/27
48/54
110/125
0
1
dropoff
400
Trip coil
52A
52B
Circuit Breaker
Resistor R1 and R2 (ohms)
1.2k
2.7k
5.2k
0
50
&
pickup
0
Chapter 13 - Supervision
-ve
CB Aux 3ph(52 -A)
*Output Relay
straight
0
CB Aux 3ph(52 -B)
Latching LED
User Alarm
V01218
295