|
Harmonic
Circuit Filter Reactors 5.6%,7%,14%
|
 |
Applications
Harmonic generated by non-linear loads such
as variable speed drives or other static
power conversion equipment have grown
rapidly in recent years. Harmonic currents
and the voltage distortion, created by these
currents have devastating effects on power
supply and distribution systems and its
connected loads. This can result in failure
of power factor correction capacitors due to
overloading, system resonance, overheating
of cables and transformers as well as
misoperation of PLC's, computer and other
sensitive applications. A present method to
treat harmonic problems is the use of filter
circuit reactors combined with power
capacitors in detuned and tuned filters as
well as the improvement of the power factor
and the power quality, harmonics are also
absorbed from the networks. Furthermore, a
critical amplification of the current
harmonics caused by a parallel resonance
between the power capacitors and the
inductances of the power supply system can
be avoided.
Dimensioning
The dimensioning of the filter circuit
reactors is based on the recommendation of
allowable limits of voltage harmonics in
public and industrial networks according of
IEC 10002-4. In case of higher harmonic
loads in networks, special designed filter
circuit reactors have to be used. The actual
loads can be detected by means of a harmonic
analysis. The measured values from the basis
for the dimensioning of the filter circuit
reactors.
Design Features
Neptune reactor are single layer winded
design with an iron core & air gap. They
are made out of highest quality material and
very stringent quality control. It has been
designed with properties like low
temperature rise and lower flux density so
that it can operate in worst conditions of
ambient and harmonic overloads.
It offer
very good degree of linearity. Cheaper &
non-linear reactors may trigger undesirable
chain phenomena during periods of operation
with high harmonic values, such as reducing
in the inductance with consequent increase
in the resonance frequency of the LC group,
which would drain off more harmonic current, further reducing its inductance and overload the reactor more and more. Reactors are available with filtering factor of 5.6%, 7% and 14% in 5, 7.5, 10, 12.5, 15, 20, 25, 50, 75 and 100 KVAr rating. Any other filtering factor and rating can be made on request.
Losses
The 50 Hz losses are comparatively low but when the filter circuit reactors are installed into the cabinets, they are charged with additional currents, predominately those of the 5th, 7th & 11th harmonics. Then the total heat losses dissipated can be of a level whereby they have to be extracted from the cabinets, by means of fans.
Terminals
The terminals for filter circuit reactors are designed as cable terminals (dm)=8,5m
Ordering Information:
|
|
|
|
|
