ABB RELION REX640 - Page 962

ZL
Zone Z1
Zone Z5
Zone Z2
Zone Z3
X
R
Zone Z4
Under impedance
start charactristics
Load encroachment
area
Figure 535: Zones of DSTPDIS function (example 1)
ZL
Zone Z1
Zone Z5
Zone Z2
Zone Z3
X
R
Zon Z4
Under impedance
start characteristics
Load encroachment
area
e
Figure 536: Zones of DSTPDIS function (example 2)
Each zone in DSTPDIS provides three independent phase-to-earth and three phase-
to-phase measuring elements. A three-phase fault is measured with a dedicated
measuring element. Each measuring element is controlled by the faulted loop phase
selection function. Based on the recognized fault type, the release signals are given
for the corresponding measuring elements.
DSTPDIS supports both fault detection dependent control of zone timers and
zone-dedicated timer control for maximum application flexibility. Zone-dedicated
timer control is enabled when configuration parameter Zone timer mode is set to
"Independent" (change requires relay reboot). In this case, operate delay timers of
protection zones are independent of each other and start when a fault is seen in
their protection zone. Fault detection dependent control of zone timers is enabled
when Zone timer mode is set to "Common". In this case, operate delay timers of
all protection zones start simultaneously as soon as the fault is seen by the GFC.
Protection functions
1MRS759142 F
962 REX640
Technical Manual