Future of Harmonics in Data Centers and Office buildings
Future of Harmonics in Data Centers and Office buildings
(OP)
Is there any truth the rumours I have heard (its coming from a client and I can not directly challange it without a firm knowledge myself) that the harmonics issue in the data center and/or in office buildings will go away in next 5-10 years?
I am sure the power supply desing for comuters may have improved overtime, but are they contribuiting to minimize harmonics in the power system?
Which harmonics are more prevailant (triplen, 5th,7th, 11th 13th?).
Anyone thinks that applying K-13 transformers and double neutrals will be thing of the past anytime soon?
I will appreciate input on this subject.
I am sure the power supply desing for comuters may have improved overtime, but are they contribuiting to minimize harmonics in the power system?
Which harmonics are more prevailant (triplen, 5th,7th, 11th 13th?).
Anyone thinks that applying K-13 transformers and double neutrals will be thing of the past anytime soon?
I will appreciate input on this subject.





RE: Future of Harmonics in Data Centers and Office buildings
Mind you the earth current will still be an issue because at 3.5mA each, 100 workstations can generate a shed load of earth leakage!
RE: Future of Harmonics in Data Centers and Office buildings
RE: Future of Harmonics in Data Centers and Office buildings
Many power supplies already have a sine current shaping input circuit. It is a rectifier and a switcher that uses the rectified voltage as a reference for the current delivered to the rest of the power supply. So, if voltage is sine shaped, the current will be sine shaped. And not only that, it will also be in phase with voltage, resulting in very low distortion and Power Factor = 1.00
Unitrode, Siemens, Linear Technology and TI (I think) have been doing this for many years now.
* There will be a standard for devices with more than 16 A sometime in the future. It may, in fact, already be there but escaped me.
Gunnar Englund
www.gke.org