MI 3101 EurotestAT: Measurements
Line impedance / Voltage drop
60
5.5 Line impedance / prospective short-circuit current and
Voltage drop
Line impedance is measured in loop comprising of mains voltage source and line wiring. It
is covered by the requirements of the EN 61557-3 standard.
The Voltage drop sub-function is intended to check that a voltage in the installation stays
above acceptable levels if the highest current is flowing in the circuit. The highest current
is defined as the nominal current of the circuit's fuse. The limit values are described in the
standard EN 60364-5-52.
Sub-functions:
Z-LINE – Line impedance measurement according to EN 61557-3,
Δ
U – Voltage drop measurement.
Figure 5.21: Line impedance
See
4.2 Single test
for keys functionality.
Figure 5.22: Voltage drop
Test parameters for line impedance measurement
TEST Selection
of
sub-function
[Z,
Δ
U]
FUSE Type
Selection of
fuse
type
[---, NV, gG, B, C, K, D] *
FUSE I
Rated current
of selected fuse
FUSE T
Maximum
breaking time
of selected fuse
Isc_lim
Minimum short circuit
current
for selected fuse combination.
See Appendix A for reference fuse data.
*--- Means no fuse selected
Additional test parameters for voltage drop measurement
Limit
Maximum voltage drop [3.0 % ÷ 9.0 %].
