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#31125 11/10/03 11:52 PM
A
Anonymous
Unregistered
Does anyone know of a good site to learn about high pressure sodium and metal halide lighting? I am especially curious about the function of the capacitor and why on the transformer it states the cap is "optional"
Thanks, Brian

#31126 11/11/03 08:19 AM
Joined: Aug 2001
Posts: 49
Member
Hey Brian,
Go to ballast school--http://www.advancetransformer.com/university/default.asp

#31127 11/11/03 08:39 PM
A
Anonymous
Unregistered
Thanks VT that was a good tip. I am already educated!
Brian

#31128 11/12/03 09:48 AM
Joined: Aug 2001
Posts: 49
Member
Did you print your certificate? I give my guys twenty dollars out of the recycle fund when they complete advance's ballast training or Lightolier's lessons in lighting.

#31129 11/13/03 11:37 PM
Joined: Oct 2000
Posts: 2,722
Broom Pusher and
Member
Brian;

Did the Advance University help out?
If not, poke around here a bit, and you'll find many discussions of the HID nature! [Linked Image]

BTW: Normally, a Capacitor is used to improve Power Factor from Nominal (50%) to High (±90%). This is the "Option" of the High Pressure Sodium "55 Volt Lamp" family, as are a few other low Wattage HIDs.

There are other uses of the Capacitor - such as with the High Reactance Autotransformers - where the Cap is driven on the Input side of Ballast, and with CWA's, it's a series element to the Reactor section. With Regulated Lag Ballasts, there's a seperate Capacitor Secondary Winding.
All these setups do not specify the Cap as "Optional".

Scott35


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
#31130 11/30/03 05:28 PM
Joined: May 2002
Posts: 202
J
Member
Thanks for the link, I just got my certificate. Going to do the Lightolier's next. Interesting stuff

#31131 12/04/03 10:00 PM
Joined: Oct 2000
Posts: 2,722
Broom Pusher and
Member
Did you guys get the answers you were looking for at the linked sites?

I have been to these sites and, while the information is rather nice, there's really not a lot of technical references - such as the reasoning for "Optional Capacitor for HPS Ballast", like which ones do and do not have "Optional" capacitors, along with the results of not using a capacitor on Ballasts which incorporate one in the Lamp circuitry, or on the Secondary side, or in the Primary side (not listed as "Optional Use" of caps.).

Just curious...

Scott35

p.s. how about an on-line HID quiz???
would be fun! [Linked Image]


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
#31132 12/04/03 10:44 PM
A
Anonymous
Unregistered
Scott,
I got all my questions answered. The ballast university is real nice, you can refer back to it anytime. Thanks for this site.
Brian


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