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There are inevitable compromises with ALL methods of Electrical Power Conditioning. It is up to the USER to establish which technology provides the most attractive solution.
In the Test House or Specialised Test Facility where a variety of solutions can be required it may seem that the most flexible solution is to provide a number of small stabilisers and battery back-up units which can be moved around to the point of application. Experience shows that there is one extra major advantage to planning the needs when the facility is under construction and wiring out several power supply options to every general purpose test station. The advantage is that ALL power conditioning products have ratings which are determined by cost and if the distributed conditioning is combined into a central facility it is less likely that a test piece will be too large for a mobile conditioning solution.
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There are several other considerations including efficiency impedance/shared usage load effects and MTBF. These are summarised in the table:
Topology
|
prime characteristic
|
features
|
benefits
|
considerations
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lightning protection |
low cost |
zero series impedance very high MTBF |
fit to guidelines in BS6601 |
|
notch filter |
narrow band noise attenuation |
low cost |
unwanted frequency rejection |
only works over design frequency band |
galvanic isolation |
low impedance |
safety of personnel |
use RCCDs for protection |
|
galvanic isolation noise attenuation |
exceptional common-mode noise protection |
ease of application efficiency |
leakage inductance adds to mains impedance |
|
transverse-mode noise attenuation voltage stabilisation |
exceptionally robust noise filter waveform notch replacement sine waveform re-building 2-way filtering voltage stabilisation |
clean mains supply MTBF=200kHr overload proof |
weight efficiency 3-phase delta loads input protection down stream protection |
|
UPS off line |
normally on standby |
lower cost |
provides emergency power |
switch over time usually lower power ratings battery maintenance |
load runs on inverter full time |
provides 2nd source supply |
provides emergency power |
non unity PF loads 3-phase delta loads battery run times efficiency battery maintenance MTBF=20kHr |
|
rotary converter |
50 to 60Hz etc |
low technology solution |
virtually perfect noise rejection |
usually fixed frequency MTBF=5kHr maintenance cost |
generator |
chemical energy source |
huge range of options |
permits manual frequency variation |
noise maintenance environmental problems |
Advance supplies all these products. If you need any more help - please ask!
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