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Feeder Protection
REF610
Product version: C
Table 21. Three-phase thermal overload protection for cables (θ>)
Feature
Set full load current, I
θ
Set alarm level, θ
>
a
Trip level, θ
>
t
Time constant, τ
Operate time accuracy I/I
>1.2
θ
Table 22. Phase discontinuity protection (ΔI>)
Feature
Set start value, ΔI> at definite-time characteristic
Start time, typical
Time/current characteristics definite time operate time, tΔ>
Resetting time, maximum
Drop-off/pick-up ratio, typical
Operate time accuracy
• At definite-time characteristic
Operation accuracy
• 10...100%
Table 23. Arc protection (ARC)
Feature
Stage ARC
Set trip value ArcI>
Operate time
ArcI
>
0
Operate time
Resetting time
Operation accuracy
LightSensor>
Activation time of LightSensor>
Resetting time
1)
Applies only if a signal output contact (SO1...5) is used. If a power output contact (PO1...3) is used, 2...3 ms will be added. It is used only for alarm purposes.
ABB
Value
0.30...1.50 x I
n
50...100%
100%
1...200 min
±2% of the set operate time or ±1 s
Value
10...100% ΔI =(I
-I
)/I
*100%
max
min
max
100 ms
1...300 s
70 ms
0.90
±2% of the set operate time or ±75 ms
±3% of the set start value and ±1 unit
Value
0.5...35.0 x I
n
1)
< 15 ms
5.0...800% I
n
1)
< 17 ms
30 ms
±7% of the set start value
< 15 ms
20 ms
1MRS756295 G
17
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