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3.4
Protection: Mode Selection
3.4.1 '3 Pole Diff' + REF' Operation
The relay is configured for '3 Pole Diff +REF' operation using the SYSTEM CONFIG > Relay Config > 3 Pole Diff
+ REF setting. Protection elements are automatically enabled as shown in Figure 3-5.
When configured in this way the relay uses the 87/50-n and the REF-1 elements. These elements operate
independently of each other. Independent outputs are available.
When 87/50-n Trip Check Logic is Enabled outputs are available when any two phases operate (i.e. 87/50-n
phase-phase check).
For detailed information on the differential and restricted earth fault functions refer to sections 3.1and 3.3.
87/50-n
Disabled
Enabled
Zone Switch Out
Inhibit 87/50-n
User Inhibit 87/50-n
87/50-n CT50
Inhibit 87/50A-n
Inhibit
Disabled
CT50A
Enabled
Inhibit 87/50B-n
CT50B
IA
IB
IC
Inhibit 87/50C-n
CT50C
87/50-n Trip
Check Logic
Enabled
Disabled
87REF-1
Disabled
Enabled
&
User Inhibit 87REF-1
Inhibit 87REF-1
IG
©2013 Siemens Protection Devices Limited
3
1
&
87/50-n Setting
Enable
Blk
1
&
Blk
1
&
Blk
1
&
Notes
For details of data communications points refer to Technical Manual, Chapter 4 (Data Communications).
For details of user logic inputs and outputs refer to the relevant Reydisp Manager template.
87REF-1 Setting
Enable
Blk
Figure 3-5
Logic Diagram: '3 Pole Diff + REF' Protection
Chapter 1) 7SR23 DAD Description Of Operation
87/
87/
CT50
50-1
50-2
87
74
7SR23
REF
TCS
DAD
1
x12
1
87/50-n Delay
Pickup
Operate
Pickup
Operate
Pickup
Operate
87REF-1 Delay
Pickup
Operate
General Pickup
87/50-n
1
87/50A-n
87/50AB-n
&
87/50B-n
&
87/50BC-n
87/50C-n
&
87/50CA-n
87REF-1 Pickup
87REF-1
Chapter 1 Page 20 of 36
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