GE MiCOM P747 Agile User Manual

7.2.1 PSL FOR TCS SCHEME 2
Opto-input 1
V
01218
Key: External DDB Signal
T
ime Delay
&Inverter
&
NC Output Relay
LED
User Alarm
0
4
00
dropoff
straight
0
0
Latching
Opto-input 2
1
pickup
0
5
0
CB Aux 3ph (52A)
CB Aux 3ph (52B)
1OR gate
Figure 44: PSL for TCS Scheme 2
The PSL for this TCS scheme 2 is practically the same as that of TCS scheme 1. The main difference is that
both opto-inputs must be low before a trip circuit fail alarm is given.
7.3 TRIP CIRCUIT SUPERVISION SCHEME 3
TCS Scheme 3 is designed to provide supervision of the trip coil with the breaker open or closed, but unlike
TCS schemes 1 and 2, it also 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.
V01216
52A
52B
Output Relay
+ve
-ve
Opto-input
Circuit Breaker
R3
R2
R1
Trip path
T
rip coil
Figure 45: TCS Scheme 3
When the CB is closed, supervision current passes through the opto-input, resistor R2 and the trip coil.
When the CB is open, current flows through the opto-input, resistors R1 and R2 (in parallel), resistor R3 and
the trip coil. Unlike schemes 1 and 2, supervision current is maintained through the trip path with the breaker
in either state, therefore providing pre-closing supervision.
7.3.1 PSL FOR TCS SCHEME 3
Opto-input
V
01217
Key: External DDB Signal
Time Delay
&Inverter
&
NC Output Relay
LED
User Alarm
pickup
0
5
0
0
4
00
dropoff
straight
0
0
Latching
Figure 46: PSL for TCS Scheme 3
Chapter 6 - Monitoring and Control MiCOM P747
190 P747-TM-EN-1
P747-TM-EN-1.1

GE MiCOM P747 Agile Specifications

General

Brand	GE
Model	MiCOM P747 Agile
Category	Protection Device
Language	English