DSH 314 Mains Transformers

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DSH 314 , Q2 R( e# J- [8 m* ]. J; O" _3 \

Mains Transformers

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61010-1(ed.1);am1;am2

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3 l6 [/ r; A) P% b- TStandard:
2 X. n& u1 M* ~: }6 nIEC 61010-
$ _" q0 M+ {( D1:1990+A1:1992+A2:1995
Sub clause:
14.7
: q. s8 O- E! o9 sSheet n. 314
; N+ n3 O$ E$ hPage 1(1)
' M: [7 W& Q8 KSubject:
5 l! g5 @9 E- W& }Mains transformers
! {- s3 t" r  ~+ U; q+ ]. _! mKey words:
( `& P! K9 k9 ], s) `1 K3 |( s/ }- Isolation
- Transformer
( [6 k9 j4 {  k0 G. G; `; [Decision taken by
: B! l6 X7 e- dETF3 and confirmed
by CTL at its 38th
meeting, in Toronto
Question:
7 B- M9 ?6 q- g% \+ A$ ?What isolation and loading requirements are applied to auto transformers?
2 S5 g8 Y) x& b  z+ P/ F& RDecision
Tests for loading are applied when applicable as for isolation transformers. No isolation
$ d  e2 z% w- m7 O% _! lrequirements are applied between voltage outlets, however, care must be taken to ensure that
* ?5 |, C" ^, k4 h. scircuits separated by voltages are suitably isolated form one another to prevent short circuit
1 b- o% p- V* {$ H3 }of the intervening winding.
Explanation
4 ?' w% V- F- Y- j' KAuto transformers are subject to overheating tests in the same way as isolating transformers,
$ T+ S9 i/ d+ R6 d' @however, they are not designed to provide isolation and these requirements are, therefore, not
5 _! o& c) U0 H) l$ o; dapplicable as there is direct connection between circuits.

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