MI 3000 EasiPLUS IT supply systems
67
C.4.4 Fault loop resistance and prospective fault current
Rs sub-function
Measuring range according to EN61557-3 is 0.32 1999 .
Measuring range () Resolution ()
Accuracy
*)
0.00 19.99
0.01
20.0 99.9
0.1
100 1999
1
(10 % of reading + 5 digits)
*)
The accuracy is valid if mains voltage is stable during the measurement.
Prospective fault current (calculated value)
Measuring range (A) Resolution (A) Accuracy
0.00 19.99
0.01
20.0 99.9
0.1
100 999
1
1.00k 9.99k
10
10.0 24.4k
100
Consider accuracy of fault
loop resistance
measurement
IPFC calculation................................ I
PFC
=U
N
k
SC
/ Z
L-PE
U
N
= 55 V, (44 V U 61 V) for selected 55 V single-phase system
U
N
= 63 V, (56 V U 70 V) for selected 63 V three-phase system
Test current ...................................... 1.9 A (10 ms)
Nominal input voltage ....................... 55 V / 63 V (45 Hz 65 Hz)
Test posibilities ................................. L1-PE and L2-PE
Rs(rcd) trip-lock sub-function
Measuring range according to EN61557 is 0.85 1999 .
Measuring range () Resolution ()
Accuracy
*)
0.00 19.99
0.01
(10 % of reading + 15 digits)
20.0 99.9
0.1
10 % of reading
100 1999
1
10 % of reading
*)
Acccuracy may be impaired in case of heavy noise on mains voltage.
Prospective fault current (calculated value)
Measuring range (A) Resolution (A) Accuracy
0.00 19.99
0.01
20.0 99.9
0.1
100 999
1
1.00k 9.99k
10
10.0 24.4k
100
Consider accuracy of fault
loop resistance
measurement
IPFC calculation................................ I
PFC
=U
N
k
SC
/ Z
L-PE
U
N
= 55 V, (44 V U 61 V) for selected 55 V single-phase system
U
N
= 63 V, (56 V U 70 V) for selected 63 V three-phase system
Nominal input voltage ....................... 55 V / 63 V (45 Hz
65 Hz)
Test posibilities ................................. L1-PE and L2-PE
No trip out of RCD.
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