ABB Relion 670 series - Page 543

8.10.1 Identification
M14888-1 v4
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Pole discrepancy protection CCPDSC
PD
SYMBOL-S V1 EN-US
52PD
8.10.2 Functionality
M13269-3 v14
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 warrants the
surrounding breakers should be tripped to clear the unsymmetrical load situation.
The Pole discrepancy protection function CCPDSC (52PD) operates based on information from
auxiliary contacts of the circuit breaker for the three phases with additional criteria from
unsymmetrical phase currents when required.
8.10.3 Function block
M17149-3 v6
CCP DSC (52PD)
I3P*
BL OCK
BL KDBYAR
CLOSECMD
OPENCMD
EXTPDIND
52B_A
52A_A
52B_B
52A_B
52B_C
52A_C
TRIP
PICK UP
ANSI13000305-2-en.vsdx
ANSI13000305 V2 EN-US
Figure 284: CCPDSC (52PD) function block
1MRK 502 066-UUS B Section 8
Current protection
537
Technical manual