|
Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
|
|
|
Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
|
In Reply to: Current drawn from mains supply posted by guyser on April 21, 2006 at 15:45:45:
This problem is becoming a more and more serious problem as time goes by because darn near everything is becoming a non-linear load. A poly-phase power supply system with a shared grounded current carrying conductor (a neutral) is not able to cope well with this. Most of us in the home evironment aren't seeing serious problems yet but they are quite common in something like a large data/telecom business that sets up shop in an older building without upgrading the power distribution system. The even harmonics can cancel in transformer windings but the odd order are additive and one can see upwards of 173% of the conductor current on the neutral. Needless to say this is dangerous. Remediation can take the form of oversized low impedance grounding, K rated transformers, and not sharing neutrals (sometimes oversizing neutrals too).IIRC Europe has new rules on the book to address some of this at the device level. A line reactor (choke) is a nice easy effective solution. A true choke input power supply in the audio gear would be best. Anything that can be done to keep the rectifiers in conduction as long as possible (ideally 180 degrees) will help. If a switching power supply must be used I would isolate it with some type of reactor/choke/inductor in front of an isolation transformer. Personally I do my best to avoid equipment with switchers but sadly they are more and more common everyday.
Some power cords incorporate inductive filtering and if the inductors are generous enough in size to not current limit during transients you may heard a difference. JW Miller makes some inductors that I have used to good effect but they are about the diameter of a cigar and about half the length....far bigger than your average Corcom line filter.
Russ
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Non-linear switching loads can create odd harmonics which are additive - Russ57 07:55:36 04/23/06 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
