METREL MI 3399, Инструкция с упражнениями

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Electrical Installation Safety Trainer AD 1 - MI 3399
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2.2 Line impedance measurement
Line impedance is measured in a loop comprising of mains voltage source and line
wiring (between the line and neutral conductors or between lines on a 3-phase system).
Scope of the line impedance test is:

To verify effectiveness of installed over current disconnection devices.

To verify internal impedance for supplying purpose.

To verify too high (excessive) internal line impedance for supplying purpose. This
causes too high voltage drop between power transformer and a load.
Figure 2-1: Chart reference for line impedance measurements
Figure 2-2: Measuring Z
Line
in the Application Trainer with the schuko commander