Full-Scheme Distance Measuring, Mho Characteristic Zmhpdis; Identification; Application; Generator Underimpedance Protection Application - ABB RELION 670 Series Applications Manual

1MRK 504 152-UEN B
7.4 Full-scheme distance measuring, Mho characteristic
ZMHPDIS
7.4.1

Identification

Function description
Full-scheme distance protection,
mho characteristic
7.4.2

Application

7.4.2.1

Generator underimpedance protection application

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.
7.4.3

Setting guidelines

7.4.3.1

Configuration

First of all it is required to configure the Mho function in the way shown in figure 121. 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.
Application manual
IEC 61850 IEC 60617
identification identification
ZMHPDIS
S00346 V1 EN-US
Section 7
Impedance protection
SEMOD154227-1 v4
SEMOD154447-2 v2
ANSI/IEEE
C37.2 device
number
21
SEMOD154444-1 v1
GUID-9856D235-9840-486B-9C78-A46E190780CD v2
SEMOD154496-1 v2
GUID-5EB33045-361C-4849-8E53-C793A209E3FA v3
219