Iwatsu SS-663, Instruction Manual

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Chapter 4 Measurement
24
4.3.4 Handling of Rogowski Coil Sensor
The Rogowski Coil has a coil structure consisting of an extra-fine wire rod
wound tight around a wick material of Teflon tube. Avoid pulling or bending
the Rogowski Coil Sensor part excessively as much as possible. Application
of excessive force to the Rogowski Coil may cause plastic deformation of
part of the coil. Use caution when attaching and detaching the coil from a
target to be measured. Deformation of the coil structure will degrade the
specifications of the sensor part.
In order to measure current, the one end of the Rogowski Coil is required to
be inserted into the joint hole so that the coil forms a loop that circles around
the current to be measured. The insertion length of the coil is about 8 mm
from the joint hole end. Insert the Rogowski Coil until bumping.
WARNING
・
Avoid the generation of corona discharge in
an environment where high voltage is
applied to the sensor part for a long time.
Depending on the frequency of the applied voltage
and installation conditions of the sensor part, Corona
discharge may be generated even when a voltage
lower than the resisting voltage is applied to the
sensor part. This generation may lead to degrading
the insulating outer sheath, causing an electrical
shock, fire, or failure.
Corona discharge tends to be generated due to
electric field concentration. Take some measures to
avoid the generation; for example, keep the sensor
part away from high-voltage parts as far as possible to
achieve insulation.
CAUTION
・
Stop using the Rogowski Coil with its sheath
damaged, because the resisting voltage for
insulation of the coil cannot be guaranteed.
The Rogowski Coil has a structural life. The duration of use of the coil
depends on the use environment and use conditions.
We recommend that you replace a deformed coil or a coil with its surface
damaged, in order to maintain safety and accurate measurement. Contact
Iwatsu office or our sales distributors for replacement.