Line Impedance And Prospective Short-Circuit Current / Voltage Drop; Line Impedance And Prospective Short Circuit Current; Voltage Drop - Testboy Tv 455 Benutzerhandbuch

®
TV 450/455
5.6 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,
❑
ΔU – Voltage drop measurement.
❑
See chapter 4.1 Function selection for instructions
on key functionality.
Test parameters for line impedance measurement
Selection of line impedance [Zline] or voltage drop [ΔU] sub-function
Test
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
Lim Minimum short circuit current for selected fuse.
See Appendix A for reference fuse data.
Additional test parameters for voltage drop measurement
ΔU
Maximum voltage drop [3.0 % ÷ 9.0 %].
MAX
Figure 5.26: Line impedance
Figure 5.27: Voltage drop
45
Line impedance