Insulation Resistance Measurement - BEHA UNITEST TELARIS 0100 Bedienungsanleitung

5.2 Insulation Measurement
For electrical installations the insulation measure-
ment has to be carried out prior to final commis-
sioning. This measurement is of basic importance
as the insulation measurement is considered to be
the only measurement for fire protection. If, due to
an insulation error, a limited fault current flows be-
tween two conductors, this leads to a heating up or
even to a fire. Only the insulation measurement pro-
cedure can detect such a fault.
Example Insulation Measurement:
According to IEC 60364 (DIN VDE 0100 Part 610)
the insulation resistance measurement is carried
out:
• from all phase conductors (e.g. L1, L2, L3) to-
wards earth or to protective earth (PE)
• between protective earth (PE) and neutral (N)
Additionally, it is advised to perform the following
measurements:
• between all active conductors (e.g. L1, L2, L3, N).
This measurement must be carried out individually
for each current circuit. The measurement is carried
out a DC voltage of 500V.
The insulation resistance is determined by cur-
rent/voltage measurement. The Telaris 0100 can
perform an automatic measurement or a permanent
measurement. The measurement duration is dyna-
mic for automatic measurements.
Insulation Measurement
The measurement lasts until measurement value
stabilisation, however a maximum of 10s. Thus, the
correct measurement result is determined for les
capacitive loads within a very short time period and
the battery life is increased. The automatic measu-
rement is started by brief pressing of the "Start" key.
The measurement duration of continuous measu-
rements lasts as long as the "Start" key is being de-
pressed.
During insulation measurement, ensure that all
loads are disconnected from the mains and it
must be ensured that all current circuits are
switched on.
Prior to any insulation measurement, it must be
guaranteed that no installation parts to be test-
ed are live.
If an external voltage is present, the instru-
ment displays „Uext" and "attention" after
the „Start" key has been pressed. The insula-
tion measurement is then blocked. The sym-
bol „Uext" (5) appears if a second measure-
ment is started without an extraneous
voltage present.
During insulation measurements, the measu-
rement voltage charges capacitive UUTs. The
UNITEST TELARIS 0100 automatically di-
scharges the UUT after completion of the mea-
surement. When interrupting the measure-
ment or when removing the test leads prior to
test termination, a dangerous voltage may be
present at the UUT. If a dangerous voltage is
detected during voltage measurement, the
UUT must be manually discharged using a high
impedance resistance (not via short-circuit!).
During the measurement, the operator may not
touch the UUT / the installation being tested,
danger of electrical shock!
If UUTs of higher capacities are tested (e.g.
long cables or conductors), the automatic di-
scharge may take longer.
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