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CASE STUDY 2
Voltage Drop Caused by Wiring Impedance
Environment:
Problem:
Analysis:
Target: 1-phase 2-wire, 100V circuit
This is an easy simlulation similar to Case Study 1 to monitor the voltage drop caused by wiring
impedance. The voltage at a load shows the voltage drop to the supply side when the wire is thin
and long.
CH2
CH1
When switching an industrial dryer (100V
AC, 1kW, 50/60Hz) from OFF to HOT to
COLD and back to OFF, confirm the
difference in voltage drop between short
and long wirings.
1) When wiring is short
(low wiring impedance without the wires
circled in red)
2) When wiring is long
(high wiring impedance with wires circled in
red)
1) Short Wiring 2) Long Wiring
Voltage RMS Value Fluctuation
Voltage at power supply side
Voltage at consumption side
U1 (CH1: red) is the voltage not affected
by the wiring impedance.
U2 (CH2: green) is the voltage affected
by the wiring impedance.
By adding high wiring impedance, the
voltage drops for 6Vrms on the
consumption side.
The wiring impedance of the wires circled in
red is 0.6-Ohm.
The voltage drop is calculated by using the
Ohm's Law such that "0.6-Ohm x 10A =
6Vrms."
6Vrms
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