Message 20775 in TECH.WW
From: G8MNY
Date: Tue, 14 Apr 26 06:37:00 Z
Newsgroups: TECH.WW
Subject: Variacs
Message-ID: <57208_GB7CIP>
Path: N2MH4|N3HYM|VE3CGR|PI8ZTM|CX2SA|ED1ZAC|GB7CIP
R:260414/0644Z 30184@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260414/0643Z 59843@N3HYM.#FRDK.MD.USA.NOAM BPQ6.0.24
R:260414/0643Z 74885@VE3CGR.#SCON.ON.CAN.NOAM LinBPQ6.0.25
R:260414/0642Z @:PI8ZTM.#ZH1.NLD.EURO #:53356 [Den Haag] $:57208_GB7CIP
R:260414/0642Z @:CX2SA.SAL.URY.SOAM #:64139 [Salto] FBB7.00e $:57208_GB7CIP
R:260414/0640Z @:ED1ZAC.EAC.ESP.EU #:10494 [EANET1G.06] $:57208_GB7CIP
R:260414/0637Z @:GB7CIP.#32.GBR.EURO #:57208 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (New Dec 07)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
Varaic is a traded name of The General Radio Co. for a variable tapped toroid
mains auto transformer (non isolating) usually with up to 17% overvoltage.
260o__ Ratings are normally in amps. But this can be
240o__||) fuse confusing as the laminate core will have a power
fuse 220 ||) when the core has the maximum work to do of half the
||) output rating, as half the output current flows
INPUT ||) OUTPUT through the top section and half comes up from the
-10o__||) lower. However using a few % from the top or bottom
mains fuse and a 3A fast blow on the output should do.
Wiper _ Turns
knob
Bad arcing can damage the brush and windings. Do check the brush and spring out
if you have arcing. Insulation damage can cause fires as a shorted turn has
almost infinite current available.
With toroidals the winding are exposed on the outside and variacs even more so
if the bare windings are not fully encased,
See my buls "70-260V Mains Auto Transformer", "Constant Voltage Transformers",
"Maplin Mains Meter 2000MU-UK", "Portable Appliance Testing" & also "Mains
Power Protection".
Why Don't U send an interesting bul?
73 de John G8MNY @ GB7CIP
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