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10-10
Technical Data
857-UM001A-EN-P – July 2009
Directional Current Protection
Table 10.26 – Directional overcurrent stages I
Pick-up current
Mode
Minimum voltage for the direction solving
Base angle setting range
Operation angle
Definite time function:
- Operating time
IDMT function:
- Delay curve family
- Curve type
- Time multiplier k
Start time
Reset time
Retardation time
Reset ratio
Transient over-reach, any τ
Inaccuracy:
- Starting (rated value IN= 1 – 5A)
- Angle
- Operate time at definite time function
- Operate time at IDMT function
EI = Extremely Inverse, NI = Normal Inverse, VI = Very Inverse, LTI = Long Time Inverse,
MI= Moderately Inverse
This is the instantaneous time i.e. the minimum total operational time including the fault
detection time and operation time of the trip contacts.
> and I
>> (67)
dir
dir
0.10 - 4.00 x I
MODE
Directional/non-directional
0.1 V
SECONDARY
-180° to + 179°
±88°
DT
0.06
– 300.00 s (step 0.02 s)
(DT), IEC, IEEE, RI Prg
EI, VI, NI, LTI, MI...depends on the family
0.05 - 20.0, except
0.50 – 20.0 for RXIDG, IEEE and IEEE2
Typically 60 ms
<95 ms
<50 ms
0.95
<10 %
±3% of the set value or ±0.5% of the rated value
±2° U>5 V
±30° U=0.1 - 5.0 V
±1% or ±30 ms
±5% or at least ±30 ms
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