7.1.7 Technical data
Table 74: ZMHPDIS technical data
Function
Range or value Accuracy
Number of zones, Ph-E Max 4 with selectable direction -
Minimum operate current (10–30)% of IBase -
Positive sequence impedance,
Ph-E loop
(0.005–3000.000) W/phase
± 2.0% static accuracy
Conditions:
Voltage range: (0.1-1.1) x U
r
Current range: (0.5-30) x I
r
Angle: 85 degrees
Positive sequence impedance
angle, Ph-E loop
(10–90) degrees
Reverse reach, Ph-E loop
(Magnitude)
(0.005–3000.000) Ω/phase
Magnitude of earth return
compensation factor KN
(0.00–3.00)
Angle for earth compensation
factor KN
(-180–180) degrees
Dynamic overreach <5% at 85 degrees measured
with CVT’s and 0.5<SIR<30
-
Definite time delay Ph-Ph and Ph-
E operation
(0.000-60.000) s ± 0.2% or ± 60 ms whichever is
greater
Operate time 22 ms typically IEC 60255-121
Reset ratio 105% typically -
Reset time at 0.5 to 1.5 x Zreach Min = 30 ms
Max = 45 ms
-
7.2 Directional impedance element for mho
characteristic ZDMRDIR
7.2.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Directional impedance element for mho
characteristic
ZDMRDIR
S00346 V1 EN
21D
7.2.2 Functionality
The phase-to-earth impedance elements can be supervised by a phase unselective
directional function based on symmetrical components (option).
1MRK502052-UEN B Section 7
Impedance protection
197
Technical manual
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