Sonel MPI-540 - Measurement of Fault Loop Impedance Z; L-Pe[Rcd]

MPI-540 – USER MANUAL
172
Indications of short-circuit current I
k
Test range according to IEC 61557-3 can be calculated on the basis of test ranges for Z
S
and nominal
voltages.
Display range
Resolution
Basic uncertainty
0.055 …1.999 A
0.001 A
Calculated on the basis of
uncertainty for
fault loop
2.00...19.99 A
0.01 A
20.0...199.9 A
0.1 A
200...1999 A
1 A
2.00...19.99 kA
0.01 kA
20.0 …40.0 kA
0.1 kA
 Prospective fault current calculated and displayed by the meter may slightly differ from the val-
ue calculated by the user with a calculator, basing on the displayed value of the impedance,
because the meter calculates the current from unrounded value of fault loop impedance (which
is used for displaying). As the correct value, consider I
k
current value, displayed by the meter or
by firmware.
10.1.4 Measurement of fault loop impedance Z
L-PE[RCD]
(without triggering of RCD)
Measurement of fault loop impedance Z
S
Test range according to IEC 61557-3:
 0.50…1999 Ω for 1.2 m leads, WS-03 and WS-04
 0.51...1999 Ω for 5 m, 10 m and 20 m leads
Display range
Resolution
Basic uncertainty
0...19.99 Ω
0.01 Ω
(6% m.v. + 10 digits)
20.0...199.9 Ω
0.1 Ω
(6% m.v. + 5 digits)
200...1999 Ω
1 Ω
 It will not trip RCDs of I
Δn
≥ 30 mA
 Rated operating voltage U
n
: 110 V, 115 V, 127 V, 220 V, 230 V, 240 V
 Operating voltage range: 95 V…270 V
 Rated mains frequency f
n
: 50 Hz, 60 Hz
 Operating frequency range: 45…65 Hz
 Control of correctness of PE terminal connection by means of a touch electrode
Indications of fault loop resistance R
S
and fault loop reactance X
S
Display range
Resolution
Basic uncertainty
0..19.99 Ω
0.01 Ω
(6% + 10 digits) of
Z
S

 Calculated and displayed for Z
S
< 20 Ω
Indications of short-circuit current I
k
Test range according to IEC 61557-3 can be calculated on the basis of test ranges for Z
S
and nominal
voltages.
Display range
Resolution
Basic uncertainty
0.055 …1.999 A
0.001 A
Calculated on the basis of
uncertainty for fault loop
2.00...19.99 A
0.01 A
20.0...199.9 A
0.1 A
200...1999 A
1 A
2.00...19.99 kA
0.01 kA
20.0 …40.0 kA
0.1 kA