Impedance protection
SEMOD173242-2 v13
Table 40. Full-scheme distance protection, Mho characteristic ZMHPDIS
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
-
1MRK 502 068-BEN D
Generator protection REG670 2.1 IEC
Product version: 2.1
56
ABB
