It is also possible to block the lagging phase-earth loop,
Ph Prf mode Lo Z GFC
=
"BLK lagging PE". If only the phase-to-phase loop or phase-to-earth loops must be
measured, settings
Ph Prf mode Lo Z GFC
= "PP only" or
Ph Prf mode Lo Z GFC
= "PE
only" should be used, and if the logic is not required, "All loops" option should be
selected.
The tables summarize the available faulted loop selection logic schemes and their
operations. The logic is selected with the
Ph Prf mode Lo Z GFC
setting.
Table 918: Supported faulted loop phase selection schemes for low-impedance
earthed networks and their influence on the RELEASE_PE monitored data
Ph Prf mode Lo Z GFC
Element start All loops PE only PP only BLK leading
PE
BLK lagging
PE
RELEASE_PE
A & B &
EARTH_FLT
AB Fault AB Fault No fault BG Fault AG Fault
B & C &
EARTH_FLT
BC Fault BC Fault No fault CG Fault BG Fault
C & A &
EARTH_FLT
CA Fault CA Fault No fault AG Fault CG Fault
Table 919: Supported faulted loop phase selection schemes for low-impedance
earthed networks and their influence on the RELEASE_PP monitored data
Ph Prf mode Lo Z GFC
Element start All loops PE only PP only BLK leading
PE
BLK lagging
PE
RELEASE_PP
A & B &
EARTH_FLT
AB Fault No fault AB Fault AB Fault AB Fault
B & C &
EARTH_FLT
BC Fault No fault BC Fault BC Fault BC Fault
C & A &
EARTH_FLT
CA Fault No fault CA Fault CA Fault CA Fault
Impedance protection zones
DSTPDIS has five flexible and configurable impedance zones Z1..Z5. The number of
active zones has to be selected by setting
Select active zones
. For example, all five
zones can be set active by selection "All 5 zones" and only zone 1 is activated by
"Zone 1". The purpose of this setting is effectively dimming non-active zone settings
in PCM600 or the protection relay's HMI.
Example
If only zones 1 and 3 should be activated, "Zones 1-3" should be selected and
then zone 2 timers can be disabled or BLOCK_Z2 can be activated to hide zone 2
operations.
1MRS759142 F
Protection functions
REX640
Technical Manual
961
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