GE t60 Instruction Manual page 201

5 SETTINGS
EXAMPLE 2: BREAKER TRIP CIRCUIT INTEGRITY MONITORING
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 the fig-
ure below). This can be achieved by connecting a suitable resistor (see figure below) 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
selected to "Off". In this case, the settings will be:
DIGITAL ELEMENT 1
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
UR Relay - Form-A
I
I = Current Monitor
V
V = Voltage Monitor
827074A1.vsd
GE Multilin
DIGITAL ELEMENT
FUNCTION: Enabled
DIG ELEM 1 NAME:
Bkr Trip Cct Out
DIG ELEM 1 INPUT:
Cont Op 1 VOff
DIG ELEM 1 PICKUP
DELAY: 0.200 s
DIG ELEM 1 RESET
DELAY: 0.100 s
DIG ELEM 1 BLOCK:
Off
DIGITAL ELEMENT
TARGET: Self-reset
DIGITAL ELEMENT
EVENTS: Enabled
DC+
H1a
H1b
H1c
By-pass
52a
R
Resistor
Trip
Coil
DC–
Figure 5–73: TRIP CIRCUIT EXAMPLE 2
T60 Transformer Management Relay
5.6 CONTROL ELEMENTS
1
1
1
Table 5–21: VALUES OF RESISTOR 'R'
POWER RESISTANCE
SUPPLY (V DC) (OHMS)
24 1000
30 5000
48 10000
110 25000
125 25000
250 50000
setting is
BLOCK
5
POWER
(WATTS)
2
2
2
5
5
5
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