TECHNICAL DATA
37
NVA100X-D - Manual - 02 - 2016
Underfrequency - 81U
f< Element
Defi nite time
81U First threshold defi nite time (
f<
def
)
0.800...1.000
f
n
(step 0.001
f
n
)
f<
def
Operating time (
t
f
<
def
)
0.05...100.0
s
0.05...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
f<< Element
Defi nite time
81U Second threshold defi nite time (
f<<
def
)
0.800...1.000
f
n
(step 0.001
f
n
)
f<<
def
Operating time (
t
f
<<
def
)
0.05...100.0
s
0.05...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
f<<< Element
Defi nite time
81U Third threshold defi nite time (
f<<<
def
)
0.800...1.000
f
n
(step 0.001
f
n
)
f<<<
def
Operating time (
t
f
<<<
def
) 0.05...100.0
s
0.05...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
f<<<< Element
Defi nite time
81U Fourth threshold defi nite time (
f<<<<
def
)
0.800...1.000
f
n
(step 0.001
f
n
)
f<
def
Operating time (
t
f
<
def
)
0.05...100.0
s
0.05...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Pickup time
≤
0.04 s
Dropout ratio
≤
1.002
Dropout time
≤
0.05 s
Overshoot
time
0.04
s
Reference values
rest: setting value + 0.2 Hz
trip: setting value - 0.2 Hz
Pickup
accuracy ±5
mHz with 0.02
U
n
, ±
2 mHz with 1
U
n
Operate time accuracy
5% or ±
10 ms
Differential - 87G-87M-87T
Harmonic restraint (87T)
87T Second harmonic restraint threshold (
2nd-REST>)
10...80%
I
d
(step 1%
I
d
)
87T Fifth harmonic restraint threshold (
5th-REST>) 10...80%
I
d
(step 1%
I
d
)
87T Harmonic restraint intentional reset time delay (
t
H-RES
) 0.00...10.00
s
(step 0.01 s)
87T Cross phase harmonic restraint enable (
C
ROSS
H-RES
)
ON/OFF
CT saturation detector (87M-87G-87T)
Saturation detector enable (
S
at-Det
)
ON/OFF
Saturation detector intentional reset time delay (
t
Sat-Det-RES
) 0.00...0.50
s
(step 0.01 s)
I
d
>
Element (87M-87G-87T)
First threshold (
I
d
>)
0.05...2.00
I
nref
(step 0.01
I
nref
)
First stretch slope percentage (
K1)
10...50%
(step 1 %)
Second branch slope percentage (
K2)
25...100%
(step 1 %)
Second branch intersection with vertical axis (
Q) 0.00...3.00
I
nref
(step 0.01
I
nref
)
First threshold
operating time
I
d
>
(
t
d
>)
0.04
s
I
d
>>
Element (87M-87G-87T)
Second threshold (
I
d
>>)
0.50...30.00
I
nref
(step 1.00
I
nref
)
Second threshold
operating time
I
d
>>
(
t
d
>>)
0.03
s
Breaker failure - BF
BF Phase current threshold (
I
BF
>)
0.05...1.00
I
n
(step 0.01
I
n
)
BF Residual current threshold (
I
EBF
>)
0.01...2.00
I
n
(step 0.01
I
En
)
BF Time delay(
t
BF)
0.06...10.00 s (step 0.01 s)
Dropout
ratio
0.95...0.98
Dropout time
≤
0.05 s
Pickup accuracy (
I
BF
>)
±
0.5% with 0.1
I
nL
±
0.2% with 1
I
nL
Pickup accuracy (
I
EBF
>) ±
0.3% with 0.01
I
En
±
0.03% with 1
I
En
Operate time accuracy
5% or ±
10 ms
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