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Offline testing can
be both costly and time consuming. Due to the security requirements for offline
testing the first trip operation is issued before any recording can be done, and
by doing that you have missed very important breaker condition data. First trip
analysis enables not only online testing but also a swift way of determing
wether the breaker is operating as it should. And with the SA10, unlike when
using other first trip testing equipment, you have the possibillity to perform
full offline diagnostic if a breaker problem should be found.
New requirements
More and more power companies are pushing for some kind of online control of
their circuit breakers. Not only because of the expensive outage times but also
because of the safety issues involved. On combined breakers where there are now
disconnectors the need is expressed even further.
The FSU10 offers you the following
online measurement
possibillities:
- Trip and Close Coil Current
The current profiles can be compared to previous signatures or known standards
to determine the condition of the mechanism. This is very effective in order to
see the behaviors of the trip latch components. You will also determine greasing
issues.
- Main Contact Timing
Indicates the contact time and shows the possibillity of bad contact
behaviour. The connection is done with current clamps to the CT's secondary
side.
- Battery Voltage graph
Monitors the trip battery voltage to determine possible battery problems or
wiring issues.
- Auxiliary Contact Inputs
Indicates the control contacts and the trip and close initiation signals.
For breakers equiped with condition indication signals this will also give you
breaker speed parameters.
- Transducer Input
Analog or digital input that provides the user with a travel curve to further
analyze the mechanism.
The Equipment
The
FSU10 (ArtNo: S150) is a plug-in box to the SA10 and it comes complete with current clamps
for easy testing. This is a non-invasive way of connecting a mesurement
equipment to the breaker while it is still online. The unit also allows for
testing of switch control relays.
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