Impedance Protection; Distance Measuring Zone, Quadrilateral Characteristic - ABB RED670 Product Manual

Line differential protection RED670 ANSI
Customized
Product version: 1.2
The differential function can be allowed to trip as no load is fed
through the line and protection is not working correctly.
Features:

4. Impedance protection

Distance measuring zone, quadrilateral characteristic

ZMQPDIS, ZMQAPDIS (21)
The line distance protection 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.
ZMQPDIS (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 figure6.
X
Reverse
operation
IEC05000034 V1 EN
Figure 6. Typical quadrilateral distance protection zone with Phase
selection with load encroachment function FDPSPDIS (21)
activated
ABB
Forward
operation
R
en05000034.vsd
• Startup element is sensitive enough to detect the abnormal
status of the protected system
• Startup element does not influence the operation speed of
main protection
• Startup element would detect the evolving faults, high
impedance faults and three phase fault on weak side
• It is possible to block the each sub function of startup
element
• Startup signal has a settable pulse time
The independent measurement of impedance for each fault loop
together with a sensitive and reliable built-in phase selection
makes the function suitable in applications with single-phase
autoreclosing.
Built-in adaptive load compensation algorithm prevents
overreaching of zone 1 at load exporting end at phase-to-
ground faults on heavily loaded power lines.
The distance protection zones can operate independently of
each other in directional (forward or reverse) or non-directional
mode. This makes them suitable, together with different
communication schemes, for the protection of power lines and
cables in complex network configurations, such as parallel lines,
multi-terminal lines, and so on.
Distance measuring zone, quadrilateral characteristic for series
compensated lines ZMCPDIS, ZMCAPDIS (21)
The line distance protection is a five zone full scheme protection
with three fault loops for phase-to-phase faults and three fault
loops for phase-to-ground fault for each of the independent
zones. Individual settings for each zone resistive and reactive
reach give flexibility for use on overhead lines and cables of
different types and lengths.
Quadrilateral characteristic is available.
ZMCPDIS (21) function has functionality for load encroachment
which increases the possibility to detect high resistive faults on
heavily loaded lines.
1MRK505226-BUS D
15