17
NC20 - Manual - 01 - 2015
TECHNICAL DATA
Undercurrent - 37
[1]
I< Element
I<
def
Operating
logic
OR
[2]
Defi nite time
37 First threshold defi nite time (
I<
def
)
0.05...1.00
I
n
I<
def
Operating time (
t
I
<
def
)
0.04...200.0
s
0.04...9.99 s (step 0.01 s)
10.0...99.9 s (step 0.1 s)
100...200 s (step 1 s)
I<< Element
I<<
def
Operating
logic
AND
[3]
Defi nite time
37 Second threshold defi nite time (
I<<
def
)
0.05...1.00
U
n
U<<
def
Operating time (
t
I
<<
def
)
0.04...200.0
s
0.04...9.99 s (step 0.01 s)
10.0...99.9 s (step 0.1 s)
100...200 s (step 1 s)
Pickup time
≤
0.04 s
Dropout
ratio
1.03...1.05
Dropout time
≤
0.05 s
Overshoot
time
0.04
s
Pickup
accuracy ±
0.5% with 0.1
I
n
,
±
0.2% with 1
I
n
Operate
time
accuracy
5%
or
±
10 ms
Phase unbalance - 46
I
2
>
Element
I
2CLP
> Activation time (
t
2CLP
>)
0.00...100.0
s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
I
2
>
Reset time delay (
t
2
>
RES
)
0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Defi nite time
46 First threshold defi nite time (
I
2
>
def
)
1...150 % (step 1 %)
I
2
>
def
within CLP (
I
2CLP
>
def
)
1...150 %(step 1 %)
I
2
>
def
Operating time (
t
2
>
def
)
0.05...60.0
s
0.05...9.99 s (step 0.01 s)
10.0...60.0 s (step 0.1 s)
I
2
>>
Element
I
2CLP
>> Activation time (
t
2CLP
>>) 0.00...100.0
s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
I
2
>>
Reset time delay (
t
2
>>
RES
)
0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Defi nite time
46 Second threshold defi nite time (
I
2
>>
def
)
1...150 % (step 1 %)
I
2
>>
def
within CLP (
I
2CLP
>>
def
)
1...150 % (step 1 %)
I
2
>>
def
Operating time (
t
2
>>
def
)
0.05...60.0 s
0.05...9.99 s (step 0.01 s)
10.0...60.0 s (step 0.1 s)
Pickup time
≤
0.04 s
Dropout
ratio
0.95...0.98
Dropout time
≤
0.05 s
Overshoot
time
0.04
s
Pickup accuracy
± 1% with
I
2
≥ 0.5 In
Operate time accuracy
5% or ± 10 ms
Neutral unbalance current - 46N
[4]
Common confi guration:
[5]
Compensation current (
I
C
)
0.01...0.50
I
Nn
(step 0.01
I
Nn
)
Compensation angle (
φ
C
) 0...359°
(step 1°)
Automatic compensation enable (ACE)
ON/OFF
Note 1 The 37 protection is based on RMS value measurement of three phase currents (the computed RMS value takes into account the contribution
of fundamental and harmonic up to eleventh order.)
Note 2 Starting of
I<
def
threshold takes place when at least one phase currents is undershot.
Note 3 Starting of
I<<
def
threshold takes place when all three phase currents are undershot.
Note 4 The 46N protection is based on INC neutral compensated current
I
NC
= I
N
- I
C
(I
N
= RMS value of fundamental component for neutral current,
I
C
= compensation setting for neutral current).
Note 5 Setting of the compensation parameters are available inside the Set\46N Compensation menu, common for the A and B profi les
