Section 7
Impedance protection
7.1
Full-scheme distance measuring, Mho characteristic
ZMHPDIS
7.1.1
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
7.1.2
Functionality
The numerical mho line distance protection is a, up to four zone full scheme protection
for back-up detection of short circuit and earth faults.
The full scheme technique provides back-up protection of power lines with high
sensitivity and low requirement on remote end communication.
The four zones have fully independent measuring and settings, which gives high
flexibility for all types of lines.
Built-in selectable zone timer logic is also provided in the function.
The function can be used as under impedance back-up protection for transformers and
generators.
1MRK502052-UEN B
Section 7
Impedance protection
177
Technical manual
Summary of Contents for Relion REG670
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