M13946-3 v7
en 05000747_ansi.vsd
OR
BLOCK
BLKDBYAR
52b_A
52a_A
52b_B
52a_B
52b_C
52a_C
Pole
Disc repancy
detection
PolPosAuxCont
AND
PD signal from CB
AND
EXTPDIND
Unsymmetry current
detection
OR
CLOSECMD
OPENCMD
t+ 200 ms
AND
OR
AND
TRIP
0 - t
0
150 ms
ANSI05000747 V1 EN-US
Figure 287: Simplified block diagram of pole discrepancy function CCPDSC (52PD) - contact
and current based
CCPDSC (52PD) is disabled if:
• The IED is in TEST mode and CCPDSC (52PD) has been blocked from the local HMI
• The input signal BLOCK is high
• The input signal BLKDBYAR is high
The BLOCK signal is a general purpose blocking signal of the pole discrepancy protection. It can be
connected to a binary input in the IED in order to receive a block command from external devices
or can be software connected to other internal functions in the IED itself in order to receive a block
command from internal functions. Through OR gate it can be connected to both binary inputs and
internal function outputs.
The BLKDBYAR signal blocks the pole discrepancy operation when a single phase autoreclosing
cycle is in progress. It can be connected to the output signal 1PT1 on SMBRREC (79) function block.
If the autoreclosing function is an external device, then BLKDBYAR has to be connected to a binary
input in the IED and this binary input is connected to a signalization “1phase autoreclosing in
progress” from the external autoreclosing device.
If the pole discrepancy protection is enabled, then two different criteria can generate a trip signal
TRIP:
• Pole discrepancy signaling from the circuit breaker.
• Unsymmetrical current detection.
8.10.7.1 Pole discrepancy signaling from circuit breaker
M13946-18 v4
If one or two poles of the circuit breaker have failed to open or to close the pole discrepancy
status, then the function input EXTPDIND is activated from the pole discrepancy signal derived
from the circuit breaker auxiliary contacts (one NO contact for each phase connected in parallel,
1MRK 502 066-UUS B Section 8
Current protection
541
Technical manual
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