8.5 Full-scheme distance protection, quadrilateral for
earth faults ZMMPDIS (21), ZMMAPDIS
(21)
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8.5.1 Identification
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Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Fullscheme distance protection,
quadrilateral for earth faults (zone 1)
ZMMPDIS
S00346 V1 EN-US
21
Fullscheme distance protection,
quadrilateral for earth faults (zone 2-5)
ZMMAPDIS
S00346 V1 EN-US
21
8.5.2 Application
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8.5.2.1 Introduction
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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 dif
ferent 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.
The distance protection function in 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.
8.5.2.2 System grounding
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The type of system grounding plays an important roll when designing the protection
system. In the following some hints with respect to distance protection are highlighted.
Solid grounded networks
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In solid grounded systems the transformer neutrals are connected solidly to ground
without any impedance between the transformer neutral and ground.
Section 8 1MRK 504 163-UUS A
Impedance protection
290 Transformer protection RET670 2.2 ANSI
Application manual
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