RFL Electronics GARD 8000 - Figure 13-3. Current Differential Rear Connections

Current Differential Relay
GARD 8000 SYS RFL Electronics
June 20, 2014 13-5 973.334.3100
Connections are made to the Current Differential Module on the rear of the GARD chassis as shown
below. The terminal assignments are the same for the 3U and 6U chassis. These connections are
fixed.
IA +
IA -
IB +
IB -
IC +
IC -
IG + IG -
Figure 13-3. Current Differential Rear Connections
Shown below is a typical AC/DC Schematic for the GARD 3U Chassis with a Distance Relay Module
in slot 3 and a Current Differential Module in slot 4.
PS2-1
PS2-2
_
+
IG
-
IG
+
IC
+
IC
-
IB
-
IB
+
I
G
I
C
I
B
I
A
IA
+
IA
-
+ 125
VDC
+ 125
VDC
+ 125
VDC
+ 125
VDC
+ 125
VDC
+ 125
VDC
+ 125
VDC
+ 125
VAC
+
125VDC
+
125VDC
+
125VDC
-
125VDC
SLOT 3
SLOT 4
Distance
Only Trip
Distance
Only Trip
Distance "or"
Differential Trip
Distance "or"
Differential Trip
Differential
Only Trip
SPARE
Differential
Only Trip
Differential
Only Trip
Differential
Only Trip
Transfer Trip
Transfer Trip
87L Multi Phase
Reclose Block
Communications
Alarm
87L Current
Differential
Communications
C37.94 Compliant
Optical Interface
38/150 VDC
Power
Supply
Station
Battery
GARD 8000 Line Current
Differential Relay
GARD 8000 Distance Relay
Key
Transfer
Trip
DTT
Initate
Available
89b
52b
89b Disconnect
52b Breaker Status
Slot 2-13
Slot 2-14
Slot 2-15
Slot 2-16
Slot 2-17
Slot 2-18
Slot 2-19
Slot 2-20
Slot 2-21
Slot 2-22
Slot 2-23
Slot 2-24
Slot 1-13
Slot
1-14
Slot
1-16
Slot 1-15
SPARE
Slot 1-17
Slot
1-20
Slot 1-19
Slot
1-18
Slot
1-22
Slot
1-24
Slot 1-21
Slot 1-23
Slot 2-1
Slot
2-2
Slot 2-3
Slot
2-4
Slot 2-5
Slot
2-6
Slot 2-9
Slot 2-7
Slot
2-8
Slot
2-10
Slot
2-12
Slot 2-11
PS2 Minor Alarm
PS1 Major Alarm
TO ANNUNCIATOR OR SCADA
PS2-4
PS2-3
PS2-5
PS1-4
PS1-3
PS1-5
Slot 1-TX
Slot 1-RX
AC SCHEMATIC
Tripping Direction
52
2
9
8
7
6
5
4
3
VA
VB
VC
V SYNC CHECK
VA
VB
VC
VN
IN
IC
IA
IB
I SENSITIVE NEUTRAL
OR CURRENT
POLARIZING
I NEUTRAL FROM
PARALLEL LINE FOR
FAULT LOCATOR
13
14
16
17
19
20
10
11
22
23
IA
IB
IC
52
TC-2
52
TC-1
52a
52a
86-2
86-1
86-2
86-1
TO SCADA
TO SCADA
TO
RECLOSE
BLOCK
Figure 13-4. AC/DC Schematic for GARD 8000 Differential Relay (Typical)