GE C60 Instruction Manual page 144

5.6 CONTROL ELEMENTS
NOTE: The
PICKUP DELAY
c) BREAKER TRIP CIRCUIT INTEGRITY MONITORING – EXAMPLE 2
If it is required to monitor the trip circuit continuously, independent of the breaker position (open or closed), a method to
maintain the monitoring current flow through the trip circuit when the breaker is open must be provided (as shown in Figure:
TRIP CIRCUIT - EXAMPLE 2). This can be achieved by connecting a suitable resistor (as listed in the VALUES OF RESIS-
TOR 'R' table) across the auxiliary contact in the trip circuit. In this case, it is not required to supervise the monitoring circuit
with the breaker position - the BLOCK setting is selected to Off. In this case, the settings will be:
# DIGITAL ELEMENT
#
5
UR Relay - Form-A
I = Current Monitor
V = Voltage Monitor
827074A1.vsd
5-80
DIGITAL ELEMENT
MESSAGE
TARGET: Self-reset
DIGITAL ELEMENT
MESSAGE
EVENTS: Enabled
setting should be greater than the operating time of the breaker to avoid nuisance alarms.
1 DIGITAL ELEMENT
FUNCTION: Enabled
DIG ELEM
MESSAGE
Bkr Trip Cct Out
DIG ELEM
MESSAGE
Cont Op 1 VOff
DIG ELEM
MESSAGE
DELAY:
DIG ELEM
MESSAGE
DELAY:
DIG ELEM
MESSAGE
Off
DIGITAL ELEMENT
MESSAGE
TARGET: Self-reset
DIGITAL ELEMENT
MESSAGE
EVENTS: Enabled
DC+
H1a
I
H1b
V
H1c
52a
R
Trip
Coil
DC–
Figure 5–34: TRIP CIRCUIT EXAMPLE 2
C60 Breaker Management Relay
1
1
1
1 NAME:
1 INPUT:
1 PICKUP
0.200 s
1 RESET
0.100 s
1 BLOCK:
1
1
Table 5–16: VALUES OF RESISTOR 'R'
POWER
SUPPLY (V DC)
24
30
48
110
By-pass
125
Resistor
250
5 SETTINGS
RESISTANCE POWER
(OHMS) (WATTS)
1000 2
5000 2
10000 2
25000 5
25000 5
50000 5
GE Multilin