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GE UR Series Instruction Manual Page 223

Line differential relay.
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5 SETTINGS
MESSAGE
MESSAGE
NOTE: The
setting should be greater than the operating time of the breaker to avoid nuisance alarms.
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
1
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
UR Relay - Form-A
I
I = Current Monitor
V
V = Voltage Monitor
827074A1.vsd
GE Power Management
DIGITAL ELEMENT
TARGET: Self-reset
DIGITAL ELEMENT
EVENTS: Enabled
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 5–71: TRIP CIRCUIT EXAMPLE 2
L90 Line Differential Relay
5.6 CONTROL ELEMENTS
1
1
1
1
1
Table 5–25: VALUES OF RESISTOR 'R'
POWER
RESISTANCE
SUPPLY (V DC)
24
30
48
110
125
250
POWER
(OHMS)
(WATTS)
1000
2
5000
2
10000
2
25000
5
25000
5
50000
5
5-139
5

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L90

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