GE D30 Instruction Manual page 264

5.6 CONTROL ELEMENTS
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 are as follows (EnerVista UR Setup example shown).
5
I = Current Monitor
V = Voltage Monitor
827074A2.VSD
5-166
DC+
UR Relay - Form-A
H1a
I
H1c
V
H1b
52a
R
Trip
Coil
DC–
Figure 5–95: TRIP CIRCUIT EXAMPLE 2
D30 Line Distance Relay
Table 5–19: VALUES OF RESISTOR 'R'
POWER
SUPPLY (V DC)
24
30
48
110
By-pass
125
Resistor
250
5 SETTINGS
setting is
BLOCK
RESISTANCE POWER
(OHMS) (WATTS)
1000 2
5000 2
10000 2
25000 5
25000 5
50000 5
GE Multilin