From: "Stephen Shaw"
Subject: Re: why there is "Round coil" transformer? what is the differencebetween ordinary one with "E" iron and "round coil" type?
Date: Sun, 19 Jan 2003 04:44:13 +0200
Organization: The South African Internet Exchange
References: <email@example.com> <1Z5W9.26977$jM5.firstname.lastname@example.org>
NNTP-Posting-Date: 19 Jan 2003 02:41:54 GMT
User-Agent: Pan/0.13.2 (I wwwondeling why alla boppah ferra pushing in?)
On Sat, 18 Jan 2003 17:03:53 +1100, Phil Allison wrote:
> "Stephen Shaw" wrote in message
>> On Fri, 17 Jan 2003 21:56:03 +0000, Robin G Hewitt wrote:
>> >> For larger currents, the Torrid transformers are smaller in size than
>> >> the Squarish looking "E" iron because the magnetic flux losses are
>> >> smaller.
>> > Hi
>> > One word of warning though. The bolt holding the toroidal in place may
>> > look like a convenient place to fix an earth tab, but it is then dead
>> > to build yourself a one turn, magnetic dead short.
>> > Such circuits usually fail the smoke test :o)
>> > best regards
>> > Robin G Hewitt
>> Any toroid mounting kit I've ever bought has had large insulating red
> fibre washers
>> which fit between the transformer and the mounting plates, so I doubt
>> the veracity of this statement.
> ** I doubt you read the damn statement - it refers to the bolt
> the middle which if you connect an earth wire to the top of makes a
> shorted turn.
> ............. Phil
How can it when the bolt is in direct contact with the (isolated (via the
red fibre washers)) plate.
From the top of the transformer - excuse the 'art'
The transformer is isolated from earth via the washers, so where is the shorted turn?