ABB RELION REX640 Technical Manual page 888

Section 4
Protection functions
882
Zone Z2
Zone Z1
Zone Z5
GUID-4BCCC542-04DB-4FC3-A4E6-D3CC4009CE32 V2 EN
Figure 477: 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. The
operation of a particular zone is given after the set Operate delay GFC (considering
the fault type) is detected. The actual operate time is the value calculated from the
initial fault detection and it is not affected, for example, in case the fault moves
between zones.
The general indication of fault for each zone is given in the START_Zx (x = 1...5)
binary output. The faulted phase information can be found from the STARTS_Zx (x
= 1... 5) integer type output signal. This signal indicates (bitwise) the started
measuring elements for the corresponding phase. Value 0 does not exist but due to the
IEC 61850 standard requirement, it is shown by value "-5" as "No fault". Value range
is thus -5, 1..63. The three-phase fault is here indicated by "AB Fault, BC Fault, CA
Fault". However, three-phase fault indication for GFC depends also on the additional
condition for voltage (see
X
Zone Z4
Zone Z3
ZL
Table 835.
1MRS759142 C
Under impedance
start
characteristics
Load encroachment
area
R
REX640
Technical Manual