8.3.3.11 Setting of timers for distance protection zones
SEMOD55087-147 v6
The required time delays for different distance protection zones are independent of
each other . Distance protection zone 1 can also have a time delay, if so required for
selectivity reasons. T
ime delays for all zones can be set in a range of 0 to 60 seconds.
The tripping function of each particular zone can be inhibited by setting the
corresponding Operation parameter to Disabled. Different time delays are possible for
the phase-to-ground tLG and for the phase-to-phase tPP measuring loops in each
distance protection zone separately, to further increase the total flexibility of a distance
protection.
8.4 Full-scheme distance measuring, Mho characteristic
ZMHPDIS (21)
SEMOD154227-1 v4
8.4.1 Identification
SEMOD154447-2 v2
Function description IEC 61850
identification
IEC 60617 identification ANSI/IEEE
C37.2 device
number
Full-scheme distance protection, mho
characteristic
ZMHPDIS
S00346 V1 EN-US
21
8.4.2 Application
SEMOD154444-1 v1
8.4.2.1 Generator underimpedance protection application
GUID-9856D235-9840-486B-9C78-A46E190780CD v2
For generator protection schemes is often required to use under
-impedance protection
in order to protect generator against sustained faults. The mho distance protection in
REG670 can be used for this purpose if the following guidelines are followed.
Configuration for every zone is identical.
1MRK 504 163-UUS A Section 8
Impedance protection
Transformer protection RET670 2.2 ANSI 285
Application manual
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