ABB Relion 670 series - Page 275

Distance protection zones
GUID-CBBD5D22-7372-4C0A-B941-44A5D21EC328 v2
The design of the distance protection zones are presented for all measuring loops: phase-to-
ground as well as phase-to-phase.
Phase-to-ground related signals are designated by AG, BG and CG.. The phase-to-phase signals are
designated by AB, BC and CA.
Fulfillment of two different measuring conditions is necessary to obtain the one logical signal for
each separate measuring loop:
• Zone measuring condition, which follows the operating equations described above.
• Group functional input signal (PHSEL), as presented in figure
77.
The PHSEL input signal represents a connection of six different integer values from Phase
selection with load encroachment, quadrilateral characteristic function FRPSPDIS (21) within the
IED, which are converted within the zone measuring function into corresponding boolean
expressions for each condition separately. Input signal PHSEL is connected to FRPSPDIS (21)
function output STCNDZ.
The input signal DIRCND is used to give condition for directionality for the distance measuring
zones. The signal contains binary coded information for both forward and reverse direction. The
zone measurement function filter out the relevant signals depending on the setting of the
parameter
OperationDir . It must be configured to the STDIRCND output on directional function
ZDRDIR (21D) function.
ANSI99000557-1-en.vsd
AB
BC
CA
AND
AND
AND
AND
AND
AND
AG
BG
CG
PHSEL
NDIR_AB
NDIR_BC
NDIR_CA
NDIR_A
NDIR_B
NDIR_C
PUZMPP
STNDPE
AND
BLOCK
LOVBZ
PHPUND
BLK
OR
OR
OR
OR
BLOCFUNC
ANSI99000557 V2 EN-US
Figure 128: Conditioning by a group functional input signal PHSEL, external start condition
1MRK 502 066-UUS B Section 7
Impedance protection
269
Technical manual