The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Featured:

2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Members: Did you know?
by Admin
37 minutes 25 seconds ago
Safety at heights?
by HotLine1
Yesterday at 08:51 PM
International Wire Colour Codes
by Texas_Ranger
Yesterday at 03:29 PM
Looking for older post
by Texas_Ranger
Yesterday at 03:22 PM
Last time to chat here
by Trumpy
01/20/17 11:41 PM
New in the Gallery:
Desk-mounted "power-board"
Shout Box

Top Posters (30 Days)
Admin 36
HotLine1 20
Ruben Rocha 17
gfretwell 16
Trumpy 15
Who's Online
1 registered (Admin), 81 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#148642 - 08/31/01 09:43 AM Full Wave Rectifier - 3 Phase Input
Scott35 Offline

Broom Pusher and
Member
Registered: 10/19/00
Posts: 2724
Loc: Anaheim, CA. USA


Simple Full Wave Rectifier circuitry, using a 3 phase 3 wire Delta input.
Compare this schematic and wave plots to the 1 phase full wave bridge schematic and wave plots [separate topic]. This Rectifier has a raw pulsating output which is much smoother [stable] even before going through the filter.




Reference of AC output from transformer's secondary, to Rectifier's input. Plotted points are [AC] on the schematic.




Resulting pulsations [Pulsating DC] from Rectifier's output, and at filter's input. Plotted at [+DC] and [-DC] points.




Smoothed DC output from filter. Plotted at [+DC OUT] and [-DC OUT] points.

Compared to the 1 phase bridge circuit, this one has a much more stable DC output.

FYI: Trade this 3 phase 3 wire Delta transformer for one of the 6 or 9 phase ones I posted before [the "Rectifier Transformers"], and add another set [or two] of Diode Trios, then figure the pre filter DC output. The ripple will be lowered even more than the 3 phase one shown here.

What's all this mean, or is good for??? Who the heck knows
Seriously, it is a premium DC supply for things like Inverters, UPS's, Electronic stuff [like power amps, etc.]. The most common and ordinary example of a 3 phase input rectifier would be Automotive Alternators.
They are primarily Wye wound Stators, but some heavy duty applications use a Delta wound Stator.
The rotating field [2 pole mostly] is controlled via the regulator circuitry. This regulation controlls the peak voltage output and stuff like that [technically speaking].

Discussion thread and links to follow sometime this weekend [hopefully].

You may contact me directly if there's any questions that can't wait .

Scott SET 08/31/2001
_________________________
Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Top
Test Equipment:
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals