Frequency preference BS7671
Frequency preference BS7671
(OP)
Can anyone suggest why BS7671 2001 states a preference for 50, 60 and 400hz? I can understand the first two but where does the 400hz come from?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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Frequency preference BS7671
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RE: Frequency preference BS7671
RE: Frequency preference BS7671
<nbucska@pcperipherals.com>
RE: Frequency preference BS7671
Of course you're right that filter components will also be smaller, but I'm not too sure that there are that many filters or power factor correction capacitors installed on an aircraft power distribution system. The bulky/heavy equipment will tend to be the generators and any AC motors, where the saving in weight due to less iron will be most noticeable.
Perhaps someone else has some specifics on this?
RE: Frequency preference BS7671
RE: Frequency preference BS7671
RE: Frequency preference BS7671
RE: Frequency preference BS7671
RE: Frequency preference BS7671
Still today there are 25 Hz system in operation for RR application. 120Hz & 150 Hz were used in the eraly development of electricity.
See the enclose site for additional info:
http://www.ieee.org/organizations/history_center/historical_faqs.html#60%20cycles
http://www.achrnews.com/CDA/ArticleInformation/features/BNP__Features__Item/0,1338,64996,00.html
RE: Frequency preference BS7671
http://www.atd.siemens.de/airports/download/Macau.pdf
for airport building providing a ground 400Hz power supply to aircrafts on the ground.
In some cases, the following equipment may require 400Hz from the building:
1. Cranes
2. Computers
3. Transmitters
4. Communication equipment
5. Etc.
RE: Frequency preference BS7671