ABB RELION REX640 Technical Manual page 962

Protection functions
Figure 535: Zones of DSTPDIS function (example 1)
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
"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
all protection zones start simultaneously as soon as the fault is seen by the GFC.
962
X
Zone Z4
Zone Z3
Zone Z2
Zone Z1
Zone Z5
X
Zon Z4
Zone Z3
Zone Z2
Zone Z1
Zone Z5
Zone timer mode is set to "Common". In this case, operate delay timers of
ZL
e
ZL
1MRS759142 F
Under impedance
start charactristics
Load encroachment
area
R
Under impedance
start characteristics
Load encroachment
area
R
Zone timer mode is set to
Technical Manual
REX640