
Harmonics on input
#1
Posted 27 April 2002 - 08:57 PM
Mark Empson | administrator
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#2
Posted 17 May 2002 - 01:41 AM
When the pump is running, one house has problems with the harmonics generated by the VFD but the other does not. Both houses are fed directly from the transformer terminals with underground cables.
The inverter is fitted with DC Bus chokes and also with a coupled three phase inductor on the input.
The inverter is rated at about 70% of the transformer rating.
One solution to the problem is to install a second transformer to supply the two houses but that is an expensive option. Is there a cheaper and effective option that is guaranteed to work?? Mark Empson
http://www.lmphotonics.com

Mark Empson | administrator
Skype Contact = markempson | phone +64 274 363 067
LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters
#3
Posted 20 June 2002 - 08:32 AM
This device is approx 99% efficient ,does NOT reduce your voltage onto the drive terminals and is NOT a traditional broadband filter .The total THDI is approx 6% onto the Mains.
Whether or not it is cheap enough , I dont know. ......but it works.
#4
Posted 20 June 2002 - 08:48 PM
Welcome to the forum.
I'd like to see more information on this device (and I'm sure others would too). Can you give a reference as to where we can see / purchase such a device??
Thanks,
Mark.
Mark Empson | administrator
Skype Contact = markempson | phone +64 274 363 067
LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters
#5
Posted 21 June 2002 - 08:33 AM
Ø Treats all major harmonics generated
by Variable Speed Drives and other
3-ph rectifier loads (5th, 7th, 11th, 13th …)
Ø Easily applied to input of a single VSD
- No need to phase shift against
other VSD’s
- No need for costly harmonic studies
Ø Will meet IEEE 519 standard for both
current and voltage distortion
Ø Input current distortion < 8% over
entire operating range
Ø Power factor .98 lagging to leading
over the normal operating range
Ø Will not resonate with other power
system components
Ø Will not be overloaded by other line
side harmonic sources
Ø Suppresses overvoltages caused by
capacitor switching and other fast
changing loads
Ø Eliminates need for drive isolation
transformers, AC line reactors and
DC link chokes
Ø Removal of harmonics improves overall
system power factor
Ø Saves energy by reducing upstream
harmonic losses while operating at
>99% efficiency
Ø Reduces DC bus ripple and increases
ride-through capability of the load
#6
Guest_speedy_*
Posted 28 June 2002 - 08:17 AM
Is this device available in Australia - where from.
#7
Posted 28 June 2002 - 11:43 PM
Mark ...help us out here.
[Edited on 28/6/02 by Harry Dampers]
#8
Posted 29 June 2002 - 12:41 AM

Mark Empson | administrator
Skype Contact = markempson | phone +64 274 363 067
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#9
Posted 03 July 2002 - 02:26 AM
My info comes from a collegue that has used them....he passed the tech details around in another offline forum that I participate in (hence the delay in response) ......allegedly there is local manufacture .....and some large Australian customers have field tested and approved them.
I have had no applications for these devices yet ....although I can see that for Mines and industries that Self-Generate their Power , there are heavy energy savings ($$$) to be made.
#10
Posted 03 July 2002 - 10:39 AM
;e;
Mark Empson | administrator
Skype Contact = markempson | phone +64 274 363 067
LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters
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