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MI3002 MI3100 MI3102 Reduced low voltage supply systems
102
C.4.2 Fault loop resistance and prospective fault current
R LOOP (Rs in the UK version) sub-function
Measuring range according to EN61557-3 is 0.32 Ω ÷ 1999 Ω.
Measuring range (Ω) Resolution (Ω) 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................................ IPFC=UN × kSC / ZL-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 Ω ÷ 1999 Ω.
Measuring range (Ω) Resolution (Ω) 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................................ IPFC=UN × kSC / ZL-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.
102


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