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| Electrical
Power Analysis... |
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Most
modern electrical installations include equipment containing
power electronics that produce significant harmonic distortion
of the supply network due to their highly non-linear load characteristics.
This supply line "pollution" often causes problems
with other sensitive electronic equipment and can affect their
operation, reduce their service life and contribute significantly
to unreliability and premature failure. This in turn leads directly
to increased operational & maintenance costs.
In addition to this, many supply companies now penalise consumers
that introduce high levels of harmonics and/or operate at a
poor power factor. |
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Developments
in test equipment in recent years have now put within easy
reach the tools required to carry out sophisticated power
network analysis in order to address these issues. They
are also very useful in diagnoszing many other supply related
problems.
These instruments can be attached to various points in the
electrical installation and can continuously record parameters
such as V & I, kVA, kW, kVAR, P.F., THD & Harmonic
Content.
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data are recorded in the instruments memory during the monitoring
period and then downloaded for
inspection using powerful analysis and trending software.
The results are very accurate and detailed and graphically
illustrate the exact performance of the supply and/or distribution
system.
A decision can then be made as to what course of action to
take i.e. installation of harmonic filtering, power factor
correction, load balancing etc.
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In
this example the supply was monitored for a 24hr period.
Analysis of the results indicated a cyclical load imbalance
and that the yellow phase was loaded more than the others.
Also at the high load points in the cycle the power factor
worsened.
It was decided to balance the load and install power factor
correction equipment which we carried out. |
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