8.3.3.11 Setting of timers for distance protection zones
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. Time 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)
8.4.1 Identification
Function description IEC 61850
identification
IEC 60617 identification ANSI/IEEE
C37.2 device
number
Full-scheme distance protection, mho
characteristic
ZMHPDIS
S00346 V1 EN
21
8.4.2 Application
8.4.2.1 Functionality
Transmission and sub-transmission networks are being extended and often become more
and more complex, consisting of a high number of multi-circuit and/or multi terminal lines
of very different lengths. These changes in the network will normally impose more
stringent demands on the fault clearing equipment in order to maintain an unchanged or
increased security level of the power system.
Full-scheme distance measuring, mho characteristic function (ZMHPDIS) in the IED is
designed to meet basic requirements for application on transmission and sub-transmission
lines (solid grounded systems) although it also can be used on distribution levels.
1MRK 506 369-UUS - Section 8
Impedance protection
Line distance protection REL670 2.2 ANSI 251
Application manual
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