GE P54C User Manual

V01215
52A
52B
R
1
Trip Output Relay
+
ve
-ve
Opto-input 1
R2
Opto-input 2
Circuit Breaker
T
rip path
Trip coil
Figure 148: TCS Scheme 2
When the br
eaker 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 appr
opriate resistor value and voltage setting for this scheme.
Trip Circuit Voltage Opto Voltage Setting with R1 Fitted Resistor R1 and R2 (ohms)
48/54 24/27 1.2k
110/125 48/54 2.7k
220/250 110/125 5.2k
Warning:
This Scheme is not compatible with T
rip Circuit voltages of less than 48 V.
5.2.2 PSL FOR TCS SCHEME 2
Opto Input 1
V01218
&
*Output Relay
LED
User Alarm
0
400
dropoff
straight
0
0
Latching
Opto Input 2
1
pickup
0
50
CB Aux 3ph(52-A)
CB Aux 3ph(52-B)
*NC stands for Normally Closed.
Figure 149: PSL for TCS Scheme 2
In T
CS 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 super
vision 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.
P54A/B/C/E Chapter 13 - Supervision
P54xMED-TM-EN-1 295

GE P54C Specifications

General

Brand	GE
Model	P54C
Category	Relays
Language	English