Section 8 Impedance protection
8.1 Full-scheme distance measuring, Mho characteristic
ZMHPDIS (21)
SEMOD154227-1 v4
8.1.1
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
8.1.2 Application
SEMOD154444-1 v1
8.1.2.1 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.
8.1.3 Setting guidelines
SEMOD154496-1 v2
8.1.3.1 Configuration
GUID-5EB33045-361C-4849-8E53-C793A209E3FA v3
First of all it is required to configure the Mho function in the way shown in figure
77.
Note that a directional function block (that is ZDMPDIR) and a required number of
zones (that is ZMHPDIS) shall only be configured. In this figure, three
underimpedance zones are included.
1MRK 502 071-UUS A Section 8
Impedance protection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 195
Application manual
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