Pole Discrepancy - Siemens 7SR224 Technical Manual

If ARC OFF is selected Modes A & B do 3P Trip & Lockout. Mode C does pole by pole 1PT - 1PLO .
4.4.3

Pole Discrepancy

In Modes A and B the Recloser should not be left with 1 pole open for extended periods. This can occur if a single pole is
opened in Mode C then the Mode is changed to A or B. A Pole Discrepancy output is available which is driven in Mode A
and B only, to indicate that all poles of the recloser are not in the same state. An associated timer, PD Time Delay is set in
the Circuit Breaker menu. This output can be used as an alarm or to cause a three pole trip.Quick Logic Applications
4.4.4 Auto-Changeover Scheme Example
INCOMER 1
BI 1
CB1
CB1
OPEN
Busbar 1
Figure 4.4-2 Example Use of Quick Logic
The MV installation illustrated above is fed from two incomers. To limit the substation fault level the busbar is run
with CB3 open. When a fault occurs on one of the incomers it is isolated by the circuit protection. To re-supply the
disconnected loads from the remaining incomer CB3 is closed.
If the line fault occurs on incomer 1 it must be confirmed that CB 1 has opened before CB3 can be closed. The
relay on incomer 1 confirms that a trip has been issued to CB1 (e.g. Binary Output 2), that CB 1 has opened (e.g.
Binary Input 1) and that no current flows in the circuit (e.g. 37-1 = Virtual 1):
Incomer 1 Relay is Configured:
CB1 Open auxiliary switch wired to B.I. 1
Trip output to CB1 = B.O. 2
OUTPUT CONFIG>OUTPUT MATRIX: 37-1 = V1
OUTPUT CONFIG>OUTPUT MATRIX: E1 = BO3
CONTROL & LOGIC>QUICK LOGIC: E1 = O2.I1.V1
The output from Incomer 1 (BO3) relay is input to the relay on CB 3 (Binary Input 1). A panel switch may be used
to enable the On-Load Change-over scheme (Binary Input 2). Before Closing CB3 a check may be made that
there is no voltage on busbar 1 (27/59-1 = Virtual 1). CB 3 is closed from Binary Output 3.
CB3 Relay is Configured:
Panel switch (ON-Load Change-over Enabled) wired to B.I. 1
OUTPUT CONFIG>OUTPUT MATRIX: 27/59-1 = V1
OUTPUT CONFIG>OUTPUT MATRIX: E1 = BO3
CONTROL & LOGIC>QUICK LOGIC: E1 = I1.I2.V1
If required a time delay can be added to the output using the CONTROL & LOGIC > QUICK LOGIC: E1
Pickup Delay setting .
©2010 Siemens Protection Devices Limited
Start On-Load
Change-over
BO3
VT1
V 1 Vx
CB3
LOADS
7SR224 Argus Applications
INCOMER 2
Start On-Load
Change-over
CB2
VT2
Busbar 2
LOADS
Chapter 7 Page 43 of 50