Resistor Values; Psl For Tcs Scheme 2; Trip Circuit Supervision Scheme; Figure 172: Psl For Tcs Scheme 2 - GE MiCOM P40 Agile Technical Manual

P14D
+ve
Trip Output Relay
V01215
Figure 171: 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

As with scheme 1, 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
24/27
30/34
48/54
110/125
220/250
Warning:
If your IED has Opto Mode settings (Opto 9 Mode, Opto 10 Mode, Opto 11 Mode) in the
OPTO CONFIG column, these settings MUST be set to TCS.
5.2.2

PSL FOR TCS SCHEME 2

Opto Input 1
Opto Input 2
*NC stands for Normally Closed.

Figure 172: 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.
P14D-TM-EN-8
Trip path
R1 Opto-input 1
R2
Opto-input 2
620 Ohms at 2 Watts
820 Ohms at 2 Watts
1.2 kOhms at 5 Watts
2.7 kOhms at 10 Watts
5.2 kOhms at 15 Watts
0
1
dropoff
400
Trip coil
52A
52B
Circuit Breaker
Resistor R1 and R2
0
straight
0
50
&
Latching
pickup
0
Chapter 15 - Supervision
-ve
CB Aux 3ph(52 -A)
*Output Relay
CB Aux 3ph(52 -B)
LED
User Alarm
V01218
323