Iwatsu SS-281A Instruction Manual page 27

4.3.3 Handling of Rogowski Coil Sensor Part
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
Caution
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.
・ 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.
・
Stop using the Rogowski Coil with its sheath
damaged, because the resisting voltage for
insulation of the coil cannot be guaranteed.
Chapter 4 Measurement
23