TECHNICAL DATA
17
NG10 - Manual - 04 - 2022
3.7 PROTECTIVE FUNCTIONS
Thermal protection with Pt100 probes - 26
[1]
ThAL1...8 Alarm:
Alarm threshold 26 PT1...PT8 (Th
AL1...8
) 0...200 °C
Operating time ThAL1...8 (tTh
AL1...8
) 0....100 s
Th>1...8 Trip:
Trip threshold 26 PT1...PT8 (Th>
1...8
) 0...200 °C
Operating time ThAL1...8 (tTh>
1...8
) 0....100 s
Residual overcurrent or high impedance differential restricted ground fault - 50N/51N - 87NHIZ
I
E
> Element
I
E
> Curve type (I
E
>
Curve
) DEFINITE
IEC/BS A, B, C
ANSI/IEEE MI, VI, EI
EM
I
E
> Reset time delay (t
E
>
RES
) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Definite time
50N/51N First threshold definite time (I
E
>
def
) 0.005...10.00 I
En
0.005...0.999 I
En
(step 0.001 I
En
)
1.00...10.00 I
En
(step 0.01 I
En
)
I
E
>
def
Operating time (t
E
>
def
) 0.04...200 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)
Inverse time
[2]
50N/51N First threshold inverse time (I
E
>
inv
) 0.005...2.00 I
En
0.005...0.999 I
En
(step 0.001 I
En
)
1.00...2.00 I
En
(step 0.01 I
En
)
I
E
>
inv
Operating time (t
E
>
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
E
>> Element
I
E
>> Reset time delay (t
E
>>
RES
)
0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Definite time
50N/51N Second threshold definite time (I
E
>>
def
) 0.005...10.00 I
En
0.005...0.999 I
En
(step 0.001 I
En
)
1.00...10.00 I
En
(step 0.01 I
En
)
I
E
>>
def
Operating time (t
E
>>
def
) 0.03...10.00 s (step 0.01 s)
I
E
>>> Element
I
E
>>> Reset time delay (t
E
>>>
RES
)
0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Definite time
50N/51N Third threshold definite time (I
E
>>>
def
) 0.005...10.00 I
En
0.005...0.999 I
En
(step 0.001 I
En
)
1.00...10.00 I
En
(step 0.01 I
En
)
I
E
>>>
def
Operating time (t
E
>>>
def
) 0.03...10.00 s (step 0.01 s)
Pickup time ≤ 0.03 s
Dropout ratio 0.95...0.98
Dropout time ≤ 0.04 s
Overshoot time 0.03 s
Pickup accuracy ± 4% ± 1% I
En
Operate time accuracy 5% or ± 10 ms
Note 1 The 26 element is available when the MPT module is connect on Thybus and enabled
Note2 Standard Inverse Time (IEC 255-3/BS142 type A or SIT): t = 0.14 · t
E1
>
inv
/ [(I
E
/I
E
>
inv
)
0.02
- 1]
Very Inverse Time (IEC 255-3/BS142 type B or VIT): t = 13.5 · t
E1
>
inv
/ [(I
E
/I
E
>
inv
) - 1]
Extremely Inverse Time (IEC 255-3/BS142 type C or EIT): t = 80 · t
E1
>
inv
/ [(I
E
/I
E
>
inv
)
2
- 1]
Moderately Inverse (ANSI/IEEE type MI): t = t
E1
>
inv
· {0.01 / [(I
E
/I
E
>
inv
)
0.02
- 1] + 0.023}
Very Inverse (ANSI/IEEE type VI): t = t
E1
>
inv
· {3.922 / [(I
E
/I
E
>
inv
)
2
- 1] + 0.098}
Extremely Inverse (ANSI/IEEE type EI): t = t
E1
>
inv
· {5.64 / [(I
E
/I
E
>
inv
)
2
- 1] + 0.024}
Electromechanical (EM): t = 0.28 · t
E
>
inv
/ [-0.236 · (I
E
/I
E
>
inv
)
-1
+ 0.339]
t: operate time
t
E1
>
inv
: operate time setting
I
E1
>
inv
: threshold setting
I
E1
: residual current input (measured at I
E1
input)
Asymptotic reference value: 1.1 I
E1
>
inv
Minimum operate time: 0.1 s
Equation is valid for: 1.1 ≤ I
E
/I
E
>
inv
≤ 20; with I
E1
>
inv
setting ≥ 0.5 I
E1
n
, the upper limit is 10 I
E1
n
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