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In order to see the condition of the coils you need to measure
the current during operation. The coil current gives you key analysis points
such as the reaction time of the trip latch, coil winding and auxiliary contact
behaviour. When this test is done on a regular basis during field service,
mechanical or electric problems with the coil can be prevented. By watching the
coil aramture time you can easily spot lubrication issues in the close and trip
latches.
Recomended is to do the same as in drm or
motor current tests, use the possibillity to save graphs
from comissioning or factory tests and display them as references. That will
give any user a swift and accurate indication on coil circuit problems.
Click here to see trip latch operation>>
Online
With this technique the user can test the breaker while it is still online.
The signal to trip and close the breaker can be sent from the control room or by
manual operation from the cabinet. To avoid unecessary risks during connection
we recoment the use of current clamps.
The Equipment
Besides the oscilloscope functions that the
SA10 and
BTS2000 provides, the user also get
automatic readings of the coils parameters displayed in the
graph window in
BTS11.
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