MI 3102(H) BT EurotestXE Measurements
51
5.7 Line impedance and prospective short-circuit current /
Voltage drop
Line impedance is measured in loop comprising of mains voltage source and line wiring. Line
impedance 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 and
ΔU – Voltage drop measurement.
See chapter 4.2 Function selection for
instructions on key functionality.
Figure 5.29: Line impedance
Figure 5.30: Voltage drop
Test parameters for line impedance measurement
Selection of line impedance [Zline] or voltage drop [ΔU] sub-function
Selection of fuse type [---, NV, gG, B, C, K, D]
Rated current of selected fuse
Maximum breaking time of selected fuse
Minimum short circuit current for selected fuse.
See Appendix A for reference fuse data.
Additional test parameters for voltage drop measurement
Maximum voltage drop [3.0 % ÷ 9.0 %].
Additional key:
Measures Zref value for U function.
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