240V Mains Noise

[Leon Gross]

"Arpit" <DONTSPAMMEF00Lneko4@dodo.com.au> wrote in message
news:g4eavvonruu0vq06t0qaa7kpanms0ghs8v@4ax.com...

hmm, good point. i guess your suggestion of just buying better
controllers was the best solution

On Fri, 2 Jan 2004 19:04:34 +1100, "Phil Allison"
philallison@optusnet.com.au> wrote:


"Arpit"


i guess you could try installing a line filter


** Where do you get one that knocks out the right frequencies on the
power and lighting ccts.

The tones vary in frequency from area to area and the notch
filter
must match them.

Current status of the problem is that Integral Energy are coming out on
Monday to check that the signal levels for the off-peak switching are not
too high. They will plug something in and call the office and get them to
send a test signal. If it is too high they will reduce it, if it is normal,
then they will give me the contact details for a company that makes a notch
filter. Apparently the signals are at 1047Hz from memory he said. A normal
power filter wont do it as they are designed to remove much higher
frequencies.

Interesting, he said that the fan noise is caused by the windings not being
very tight. They have been using the signal for over 20 years he said and
they get more problems with new technology not being as well made as the old
stuff!

Leon Gross

 

[Rod Speed]

"Phil Allison" <philallison@optusnet.com.au> wrote in message news:3ff52603$0$18689$afc38c87@news.optusnet.com.au...

"Arpit"


i guess you could try installing a line filter


** Where do you get one that knocks out the right frequencies on the
power and lighting ccts.

The tones vary in frequency from area to area and the notch filter
must match them.

Doesnt have to be a notch filter, stupid.

 

[Kevin Ettery]

"Tony Pearce" <Tonyp@optus.net.com.au> wrote in message
news:3ff52fa6$0$18747$afc38c87@news.optusnet.com.au...

"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3ff52603$0$18689$afc38c87@news.optusnet.com.au...

"Arpit"
i guess you could try installing a line filter

** Where do you get one that knocks out the right frequencies on the
power and lighting ccts.
The tones vary in frequency from area to area and the notch
filter
must match them.

Why would you need a notch filter rather than a Low Pass Filter?

TonyP.

Concur. A low pass filter would be much more suitable in this application,
and much easier to implement.

Kevin

 

[Phil Allison]

"Kevin Ettery" <kpettery@dcsi.net.au>

Concur. A low pass filter would be much more suitable in this
application,
and much easier to implement.

** But Kevin does not know the basic definition of Power Factor or VA.

Strange that makers offer notch filters for this job - maybe it is not so
cheap and easy to make a mains LPF.



.............. Phil

 

[Kevin Ettery]

"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:3ff62637$0$18748$afc38c87@news.optusnet.com.au...

"Kevin Ettery" <kpettery@dcsi.net.au

Concur. A low pass filter would be much more suitable in this
application,
and much easier to implement.

** But Kevin does not know the basic definition of Power Factor or VA.
Do so! Can even explain why such a thing as Power Factor

exists (fairly technical so may be over Phil's head)!

Strange that makers offer notch filters for this job - maybe it is not
so
cheap and easy to make a mains LPF.

Phil,

You obviously don't get out much. I've seen and implemented quite a few
main low pass filters, any seen specs for many others.

Ciao


Kevin

PS Phil I suggest that you consult your proctologist about doing a
rectal-cranial separation, and BTW don't bother inviting me to the future
wedding of your parents!!!

 

[Phil Allison]

"Kevin Ettery" <kpettery@dcsi.net.au>

"Phil Allison" <philallison@optusnet.com.au> wrote in message


** But Kevin does not know the basic definition of Power Factor or VA.

Do so!

** Then post them - instead of the irrelevant ones to electronics you
did.

Strange that makers offer notch filters for this job - maybe it is
not
so cheap and easy to make a mains LPF


Phil,

You obviously don't get out much.

** Get stuffed - shithead.

I've seen and implemented quite a few main low pass filters, any seen
specs for many others.

** Post the schematic one on ABSE - one that attenuates the region from
800Hz up by 25 dB or better with *any* load, can pass 10 amps OK , is cheap
to make and has no bugs or ever draws high reactive currents.

Kevin


PS Phil I suggest that you consult your proctologist about doing a
rectal-cranial separation, and BTW don't bother inviting me to the future
wedding of your parents!!!

** I am a real bastard all right - when it comes to dealing with
charlatans like you, Kevin.




......... Phil

 

[Leon Gross]

"Leon Gross" <leon@soundlabsgroup.com.au> wrote in message
news:3ff54757$0$32016$61ce578d@news.syd.swiftdsl.com.au...

SNIP

Current status of the problem is that Integral Energy are coming out on
Monday to check that the signal levels for the off-peak switching are not
too high. They will plug something in and call the office and get them to
send a test signal. If it is too high they will reduce it, if it is
normal,
then they will give me the contact details for a company that makes a
notch
filter. Apparently the signals are at 1047Hz from memory he said. A normal
power filter wont do it as they are designed to remove much higher
frequencies.
SNIP
Leon Gross

They came out today, a day late... Anyway, levels are fine, 6V 1050Hz signal
superimposed on the mains (21st harmonic even though he said it actually is
1047Hz). Max level is 12V so about half of what the maximum is. They have
available via a supplier a 1050Hz filter, so obviously a notch filter but it
is rated at about 2A. They are finding out the cost as we would need more
than 1. Other option is a 10A version but apparently $$$$$. They will get
back to me.

Next step is to investigate the dimmers and hassle the fan makers!

Leon Gross

 

[Phil Allison]

"Leon Gross" <leon@soundlabsgroup.com.au> wrote in message
news:3ff9f11d$0$22626

They came out today, a day late... Anyway, levels are fine, 6V 1050Hz
signal
superimposed on the mains (21st harmonic even though he said it actually
is
1047Hz).

** The tone is not phase locked to the 50 Hz wave - when viewed on a CRO
screen it runs along the 50 Hz like a ripple on a pond. This is what causes
dimmers to pulse.

I assume they do this to avoid altering the rms value of the 50 Hz AC.



............ Phil