Section 6
Impedance protection
6.1
Five zone distance protection, quadrilateral and mho
characteristic ZQMPDIS (21)
6.1.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Five zone distance protection,
quadrilateral and mho characteristic
ZQMPDIS
S00346 V1 EN
21
6.1.2
Functionality(21)
Five zone distance protection, quadrilateral and mho characteristic ZQMPDIS (21) is
designed to operate in the following modes for phase-to-ground and phase-to-phase loops:
•
Quadrilateral characteristics
•
Mho characteristics
•
Combined quadrilateral and mho characteristics
The CVT filter and zone timer logic are the additional features which gives more secure,
dependable, and fast distance protection.
ZQMPDIS (21) is a five zone full scheme protection with three fault loops for phase-to-
phase faults and three fault loops for phase-to-ground faults for each of the independent
zones. Individual settings of characteristics, and for each zone resistive and reactive reach,
gives flexibility for use as back-up protection for transformer connected to overhead lines
and cables of different types and lengths.
The distance protection zones can operate independently of each other in directional
(forward or reverse) or non-directional mode. This makes them suitable, together with
different communication schemes, for the protection of power lines and cables in complex
network configurations, such as parallel lines, multi-terminal lines. The distance
protection characteristic and each zone direction are selectable by parameter settings.
1MRK 506 335-UUS A
Section 6
Impedance protection
91
Technical manual
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