22
NVA100X-D - Manual - 02 - 2016
TECHNICAL DATA
Inverse time
[1]
First threshold inverse time (I
2
>
inv
) 0.03...1.00 I
B
(step 0.01 I
B
)
First threshold
within CLP (I
2CLP>inv
) 0.03...5.00 I
B
(step 0.01 I
B
)
Operating time (t
2
>
inv
) 0.02...60.0 s
0.02...9.99 s (step 0.01 s)
10.0...60.0 s (step 0.1 s)
I
2
>> Element
CLP mode (I
2CLP
>>
Mode) OFF/ON-Element blocking/ON-Change setting
CLP activation time (t
2CLP
>>) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
Reset time delay (t
2
>>
RES
) 0.00...100.0 s (step 0.1 s)
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Defi nite time
Second threshold defi nite time (I
2
>>
def
) 0.10...1.00 I
B
(step 0.01 I
B
)
Second
threshold within CLP (I
2CLP>>def
) 0.10...5.00 I
B
(step 0.01 I
B
)
Operating time (t
2
>>
def
) 0.03...10.00 s (step 0.01 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 I
n
Operate time accuracy 5% or ± 10 ms
Phase rotation direction check - 47
47 Element
Defi nite time
Threshold (U
s1
<) 0.05...0.30 E
n
Threshold (U
s
>) 0.70...1.00 U
n
Pickup time ≤ 0.04 s
Dropout ratio 0.95...0.98
Dropout time ≤ 0.05 s
Overshoot time 0.04 s
Pickup accuracy ± 0.5% on current measures
± 0.5% on voltage measures
Operate time accuracy 5% or ± 10 ms
Thermal image for Motor/generator protection - 49MG
Common confi guration:
Initial thermal image
(Dth
IN
) 0.0...1.0
Δ
θ
B
(step 0.1
Δ
θ
B
)
[2]
Starting overload coeffi cient (K
ST
) 1.0...3.0 (step 0.1)
Negative sequence current heating coeffi cient (K
2
) 0...10 (step 1)
Heating time constant (T+) 1...200 min (step 1 min)
Cooling time constant (T-) 1.0...6.0 τ+ (step 0.1 τ+)
CLP operating mode (Dth
CLP Mode
) OFF/Blocking/Change setting
CLP activation time (t
DthCLP
) 0.00...200 s
0.00...9.99 s (step 0.01 s)
10.0...99.9 s (step 0.1 s)
100...200 s (step 1 s)
DthAL1 Element
First alarm threshold
(Dth
AL1
) 0.3...1.0
Δ
θ
B
(step 0.1
Δ
θ
B
)
DthAL2 Element
Second alarm threshold
(Dth
AL2
) 0.5...1.2
Δ
θ
B
(step 0.1
Δ
θ
B
)
Dth> Element
Trip threshold (Dth>) 0.800...1.500
Δ
θ
B
(step 0.001
Δ
θ
B
)
Pickup accuracy ± 0.5% with 0.1 I
n
, ± 0.2% with 1 I
n
Operate time accuracy 5% or ± 10 ms
Note 1
Standard Inverse Time (IEC 255-3/BS142 type A or SIT): t = 0.14 · t
2
>
inv
/ [(I
2
/I
2
>
inv
)
0.02
- 1]
Very Inverse Time (IEC 255-3/BS142 type B or VIT): t = 13.5 · t
2
>
inv
/ [(I
2
/I
2
>
inv
) - 1]
Extremely Inverse Time (IEC 255-3/BS142 type C or EIT): t = 80 · t
2
>
inv
/ [(I
2
/I
2
>
inv
)
2
- 1]
Moderately Inverse (ANSI/IEEE type MI): t = t
2
>
inv
· {0.01 / [(I
2
/I
2
>
inv
)
0.02
- 1] + 0.023}
Very Inverse (ANSI/IEEE type VI): t = t
2
>
inv
· {3.922 / [(I
2
/I
2
>
inv
)
2
- 1] + 0.098}
Extremely Inverse (ANSI/IEEE type EI): t = t
2
>
inv
· {5.64 / [(I
2
/I
2
>
inv
)
2
- 1] + 0.024}
I-squared-t (I
2
t = K): t = 16 · t
2
>
inv
/ (I
2
/I
2
>
inv
)
2
Electromechanical (EM): t = 0.28 · t
2
>
inv
/ [-0.236 · (I
2
/I
2
>
inv
)
-1
+ 0.339]
RECTIFIER (RI): t = 2351 · t
2
>
inv
/ [(I
2
/I
2
>
inv
)
5.6
- 1]
t: operate time, minimum operate time: 0.1 s
I
2
>
inv
: pickup value
t
2
>
inv
: operate time setting
Asymptotic reference value: 1.1 I
2
>
inv
Equation is valid for 1.1 ≤ I
2
/I
2
>
inv
≤ 20, the upper limit is 50 I
n
Note 2
Δ
θ is the thermal image (p.u. of the basic over temperature corresponding to the basic current I
B
).
Assuming that the secondary rated current of the line CT’s equals the rated current of the relay, as usually happens, the I
B
value is the ratio
between the rated current of the protected element and the CT’s primary rated current
—
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