ABB Relion 650 Series Technical Manual page 77

1MRK 506 326-UUS B
Section 5
5.1 Five zone distance protection, quadrilateral
characteristic ZQDPDIS (21)
5.1.1 Identification
Function description
Five zone distance protection,
quadrilateral characteristic
5.1.2 Functionality(21)
Five zone distance protection, quadrilateral characteristic ZQDPDIS (21) is a five zone full scheme
protection with three fault loops for phase-to-phase faults and three fault loops for phase-to-
ground faults for each of the independent zones. Individual settings for each zone in resistive and
reactive reach gives flexibility for use as back-up protection for transformer connected to
overhead lines and cables of different types and lengths.
ZQDPDIS (21) together with Phase selection with load encroachment FDPSPDIS (21) has
functionality for load encroachment, which increases the possibility to detect high resistive faults
on heavily loaded lines, as shown in figure30.
IEC05000034 V1 EN-US
Figure 30: Typical quadrilateral distance protection zone with Phase selection with load
Line distance protection REL650
Technical manual
Impedance protection
X
Forward
operation
Reverse
operation
en05000034.vsd
encroachment function FDPSPDIS (21) activated
© Copyright 2011 ABB Power Grids. All rights reserved
IEC 61850 IEC 60617
identification identification
ZQDPDIS
S00346 V1 EN-US
R
Impedance protection
GUID-A1237C41-91CD-423F-9051-43E1C4AEDA1D v2
ANSI/IEEE C37.2
device number
21
Section 5
M14852-1 v5
M13787-3 v10
71