Impedance protection
M13842-1 v15
Table 40. Distance measuring zone, Quad ZMQPDIS
Function Range or value Accuracy
Number of zones Max 5 with selectable
direction
-
Minimum operate residual
current, zone 1
(5-1000)% of IBase -
Minimum operate current,
phase-to-phase and phase-to-
earth
(10-1000)% of IBase -
Positive sequence reactance (0.10-3000.00) Ω/phase ±2.0% static accuracy
±2.0 degrees static angular accuracy
Conditions:
Voltage range: (0.1-1.1) x U
r
Current range: (0.5-30) x I
r
Angle: at 0 degrees and 85 degrees
Positive sequence resistance (0.01-1000.00) Ω/phase
Zero sequence reactance (0.10-9000.00) Ω/phase
Zero sequence resistance (0.01-3000.00) Ω/phase
Fault resistance, phase-to-
earth
(0.10-9000.00) Ω/loop
Fault resistance, phase-to-
phase
(0.10-3000.00) Ω/loop
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 ±40 ms whichever is greater
Operate time 25 ms typically IEC 60255-121
Reset ratio 105% typically -
Reset time at 0.1 x Zreach to 2
x Zreach
Min. = 20 ms
Max. = 50 ms
-
Line differential protection RED670
1MRK 505 379-BEN N
84 Hitachi Power Grids
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