VAMP 259 - Directional Current Protection

9.3 Protection stages
9 Technical data
Technical description
286
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VM259.EN007
9.3.2. Directional current protection
Directional overcurrent stages I
dir
> and I
dir
>> (67)
Pick-up current
0.10 - 4.00 x I
n
Mode
Directional/non-directional
Minimum voltage for the direction solving
0.1 V
Secondary
Base angle setting range
-180 to + 179
Operation angle
±88
Definite time function:
DT
- Operating time
0.06
**)
– 300.00 s (step 0.02 s)
IDMT function:
- Delay curve family
(DT), IEC, IEEE, RI Prg
- Curve type
EI, VI, NI, LTI, MI…depends on the family *)
- Time multiplier k
0.05 - 20.0, except
0.50 – 20.0 for RXIDG, IEEE and IEEE2
Start time
Typically 60 ms
Reset time
<95 ms
Retardation time
<50 ms
Reset ratio
0.95
Reset ratio (angle)
2
Transient over-reach, any τ
<10 %
Inaccuracy:
- Starting (rated value IN= 1 – 5A)
±3% of the set value or ±0.5% of the rated
value
- Angle
±2U>5 V
±30U=0.1 – 5.0 V
- Operate time at definite time function
±1% or ±30 ms
- Operate time at IDMT function
±5% or at least ±30 ms **)
*) 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.
Directional overcurrent stages I
dir
>>> and I
dir
>>>> (67)
Pick-up current
0.10 – 20.0 x I
n
Mode
Directional/non-directional
Minimum voltage for the direction solving
0.1 V
Base angle setting range
-180 to + 179
Operation angle
±88
Definite time function:
DT
- Operating time
0.06
**)
– 300.00 s (step 0.02 s)
Start time
Typically 60 ms
Reset time
<95 ms
Retardation time
<50 ms
Reset ratio
0.95
Reset ratio (angle)
2
Transient over-reach, any τ
<10 %
Inaccuracy:
- Starting (rated value IN= 1 .. 5A)
±3% of the set value or ±0.5% of the rated
value
- Angle
±2U>5 V
±30U>0.1 – 5.0 V
- Operate time at definite time function
±1% or ±30 ms
**) This is the instantaneous time i.e. the minimum total operational time including the fault
detection time and operation time of the trip contacts.