ABB REC650 User Manual

6.9.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Pole discordance protection CCRPLD
PD
SYMBOL-S V1 EN
52PD
6.9.2 Functionality
Circuit breakers and disconnectors can end up with the phases 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 own breaker is tripped to correct such a situation. If the situation persists
the surrounding breakers should be tripped to clear the unsymmetrical load situation.
The pole discordance function operates based on information from the circuit breaker
logic with additional criteria from phase selective current unsymmetry.
6.9.3 Function block
CCRPLD
I3P*
BLOCK
CLOSECMD
OPENCMD
EXTPDIND
TRIP
START
IEC08000041 V1 EN
Figure 59: CCRPLD function block
6.9.4 Signals
Table 79: CCRPLD Input signals
Name
Type Default Description
I3P GROUP
SIGNAL
- Three phase group signal for current inputs
BLOCK BOOLEAN 0 Block of function
CLOSECMD BOOLEAN 0 Close order to CB
OPENCMD BOOLEAN 0 Open order to CB
EXTPDIND BOOLEAN 0 Pole discordance signal from CB logic
1MRK 511 287-UEN A Section 6
Current protection
137
Technical manual

ABB REC650 Specifications

General

Brand	ABB
Model	REC650
Category	Control Unit
Language	English