Features
Test Voltages to 5000
V
The instrument is suitable for non-destructive measurement of
insulation resistance in electrical systems, as well as in machines,
transformers, cables and electrical equipment utilized in, for
example, locomotives, street cars and ocean going vessels with
selectable test voltages of up to 5 kV.
Voltage Measurement
to 1000 V
Testing for absence of voltage at the device under test in
systems of up to 1 kV can be performed with the voltage measuring
range.
Discharging
Capacitive Devices Under Test
Capacitive devices under test such as cables and coils, which
may be charged by the test voltage, are discharged by the measuring
instrument. The falling voltage value can be observed at the
display.
Measurements per EN
61557 Parts 1 and 2 (VDE 0413)
Nominal current amounts to 1 mA at a test voltage of 100 V, 250
V, 500 V or 1000 V.
Highly
Insulated Measurement Cables
The highly insulated measurement cables
are permanently connected for safety reasons, and due to technical
measuring considerations.
Danger resulting from inadvertently disconnected cables, for example
in the event of charging caused by capacitive devices under test, is
thus avoided.
Polarization
Index
A polarization index test is recommended
for electrical machines.
This procedure involves expanded testing of insulation resistance.
DC measuring voltage from the METRISO.5000 D-PI is applied to the
insulation for a duration of
10 minutes.
Measured values are
documented after one minute, and after ten minutes.
If the
insulation is good, the value measured after ten minutes is higher
than the value measured after one minute.
The relationship between
the two measurement values is the polarization index.
Charged material within the insulation is aligned due to the
application of measuring voltage over a long period of time,
resulting in polarization.
The polarization index indicates whether or not the charged material
contained in the insulation can still be moved, thus allowing for
polarization.
This, in turn, is an indication of the condition of
the insulation.
