ABB Relion 650 Series Technical Manual page 219

1MRK 506 326-UUS B
6.13.1 Identification
Function description
Pole discrepancy protection
6.13.2 Functionality
Circuit breakers and disconnectors can end up with their phase poles in different positions (close-
open), due to electrical or mechanical failures.An open phase can cause negative and zero
sequence currents which cause thermal stress on rotating machines and can cause unwanted
operation of zero sequence or negative sequence current functions.
Normally the affected breaker is tripped to correct such a situation. If the situation warrants the
surrounding breakers should be tripped to clear the unsymmetrical load situation.
The pole discrepancy function operates based on information from the circuit breaker logic with
additional criteria from unsymmetrical phase currents when required.
6.13.3 Function block
I3P*
BLOCK
CLOSECMD
OPENCMD
EXTPDIND
ANSI08000041 V1 EN-US
Figure 112: CCRPLD (52PD) function block
6.13.4 Signals
Table 132: CCRPLD (52PD) Input signals
Name
I3P
BLOCK
CLOSECMD
OPENCMD
EXTPDIND
Line distance protection REL650
Technical manual
CCRPLD (52PD)
TRIP
PICKUP
ANSI08000041-1-en.vsd
Type
GROUP
SIGNAL
BOOLEAN
BOOLEAN
BOOLEAN
BOOLEAN
© Copyright 2011 ABB Power Grids. All rights reserved
IEC 61850 IEC 60617
identification identification
CCRPLD
PD
SYMBOL-S V1 EN-US
Default Description
- Three phase group signal for current inputs
0 Block of function
0 Close command to CB
0 Open command to CB
0 Pole discrepancy signal from CB logic
Current protection
ANSI/IEEE C37.2
device number
52PD
PID-1167-INPUTSIGNALS v5
Section 6
M14888-1 v3
M13269-3 v10
M17149-3 v5
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