5.4 Mains Internal Resistance Measurement /
Short Circuit Current Measurement
The mains internal resistance is determined by ap-
plying a brief mains load using a large current. This
measurement is not required by DIN VDE [German
Standard], however it is considered as important
and valuable support in practical applications e.g.
for evaluating an installation as well as for trouble
shooting.
Terms:
Loop Impedance (ZL):
Sum of impedance values within a current loop (bet-
ween the L and PE conductor).
Internal Resistance (RI):
Sum of resistance values within a current loop (bet-
ween the L and N conductor).
RL: Phase resistance
RPE: Protective conductor resistance
RN: Neutral conductor
RE: Earth-Resistance
Short-Circuit Current (IPSC):
Occurring current flow in the event of short circuit.
This measurement can be used in installations
(TN systems) equipped with RCDs to detect
any exchange of the PE and the neutral con-
ductor (N) without opening within the divider.
Any faulty connection results in RCD tripping
when measuring the mains internal resistance.
Furthermore, this measurement may be used
to prove the low impedance of the neutral con-
ductor (N).
To obtain fairly precise measurement results,
it is advised to switch off all loads or to di-
sconnect them from the mains and to ensure
that the UUT is faultfree.
Connect the 'Schuko-Plug – Measurement Plug'
measurement adapter to the Telaris 0100 plus,
by plugging the measurement plug labelled with
L, N, PE into the respective sockets: L (33), N
(34), and PE (35).
15
Mains Internal Resistance Measurement / Short Circuit Current Measurement
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