16
Protection units of module SPCJ 4D40
Overload stage I
b
>
Starting current I
b
> 0.30...1.50 x I
n
Starting time <80 ms
Operation characteristic ANSI inverse
Time multiplier k 0.2...2.0
Resetting time <100 ms
Drop-off/pick-up ratio >0.95
Operation time accuracy
(k = 1.0 and I
b
> = 0.50…1.50 x I
n
) ±10% of theoretical value or ±50 ms
Operation accuracy ±3% of set value
Shortest possible trip time ~100 ms
Overload stage I
a
>
Starting current I
a
> 80...120% x I
b
>
Operating time 0.50...100 min
Resetting time <250 ms
Drop-off/pick-up ratio >0.95
Operation time accuracy ±2% of set value
Operation accuracy ±3% of set value
Undercurrent stage I<
Starting current I< 0.10...0.70 x I
n
Operating time 1.0...100 s
Reconnection time 0.50...100 min
Pulse shaped tripping signal,
pulse length ~200 ms
Pick-up/drop-off ratio <1.1
Operation time accuracy ±2% of set value or ±75 ms
Operation accuracy ±3% of set value within range 0.25...0.70 x I
n
Phase unbalance ∆I
1
>, Stage 1
Starting current ∆I
1
> 1.0...100% ∆I
n
*)
Operating time 1.0...300 s
Resetting time <100 ms
Drop-off/pick-up ratio >0.90
Operation time accuracy (∆I
cs
= 0) ±2% of set value or ±75 ms
Operation accuracy (∆I
cs
= 0) ±3% of set value within range 1.5...100% ∆I
n
Phase unbalance ∆I
2
>, Stage 2
Starting current ∆I
2
> 2.0...80.0% ∆I
n
*)
Starting time <70 ms
Operation characteristic Inverse time
Time multiplier k
∆2
0.1...1.0
Resetting time <100 ms
Drop-off/pick-up ratio >0.90
Operation time accuracy of theoretical
characteristic (∆I
cs
= 0) 7.5% or ±35 ms
Operation accuracy (∆I
cs
= 0) ±3% of set value
Shortest possible trip time ~100 ms
Setting of compensation 0.0...20.0% ∆I
n
Operation accuracy <3% of ∆I
n
*) minimum recommended: 3.0% ∆I
n
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