METREL EurotestAT MI 3101, Instruction Manual

Page: 97 / 136

MI 3101 EurotestAT: Technical specifications
97
Nominal voltage range ............................100 V

440 V
Nominal frequency ..................................50 Hz
Maximum test current (at 400V)..............267 A (10 ms)
Calculation of prospective short-circuit current (standard voltage value):
Z
V 230
= I
K
U
L-N
= 230 V

10 %
Z
V 400
= I
K
U
L-L
= 400 V

10 %
Calculation of prospective short-circuit current (non-standard voltage value):
L - L
L) - L ( N MAX
ph 3 KMAX
Z
2
×
3
U × C
= I
HOT L) - (L
L) - L ( N MIN
ph 3 KMIN
Z
2
×
3
U × C
= I
L - L
L) - L ( N MAX
ph 2 KMAX
Z
U × C
= I
HOT L) - (L
L) - L ( N MIN
ph 2 KMIN
Z
U × C
= I
N - L
N) - L ( N MAX
N) - (L KMAX Z
U × C
= I
HOT N) - (L
N) - L ( N MIN
N) - (L KMIN Z
U × C
= I
2
L - L
2
L - L L - L
X + R = Z
( )
2
L - L
2
L - L HOT L) - (L
X + R × 5 . 1 = Z
2
N - L
2
N - L N - L
X + R = Z
( )
2
N - L
2
N - L HOT N) - (L
X + R × 5 . 1 = Z
U
N(L-N)
= 230 V

10 %
U
N(L-L)
= 400 V

10 %
230 V < U
N
< 400 V
C
MAX
1.05 1.10
C
MIN
0.95 1.00
8.9.2 High precision fault loop impedance
Measuring range according to EN61557 is 5.0

1999 m

Measuring range (m

) Resolution (m

)
Accuracy
0.0

199.9
0.1
200

1999
1

(5 % + 1 m

)
Nominal voltage range ............................100 V

440 V
Nominal frequency ..................................50 Hz
Maximum test current (at 230 V).............154 A (10 ms)
Calculation of prospective short-circuit current (standard voltage value):
Z
V 230
= I
K
U
L-PE
= 230 V

10 %
Calculation of prospective short-circuit current (non-standard voltage value):
PE - L
PE) - L ( N MAX
PE) - (L KMAX
Z
U × C
= I
HOT PE) - (L
PE) - L ( N MIN
PE) - (L KMIN
Z
U × C
= I
2
PE - L
2
PE - L PE - L
X + R = Z
( )
2
PE - L
2
PE - L HOT PE) - (L
X + R × 5 . 1 = Z