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1 ]+ v! b& F/ S: N2 fDSH 314
3 X1 _, y' j5 c+ k# P& t6 r | Mains Transformers
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Standard:/ M S! w. {9 e1 k/ u
IEC 61010-1 K6 b7 f! j2 K" m
1:1990+A1:1992+A2:1995
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14.76 N7 G8 X9 I4 g" Z
Sheet n. 314
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Subject:
1 f' X" G; k/ R" [. sMains transformers
8 T) E6 J) I" u2 X. lKey words:
. R$ e# n. {$ H7 d$ h- Isolation: S- X$ a0 L8 t: `8 h
- Transformer
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ETF3 and confirmed
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meeting, in Toronto) @: g ]* I8 Y4 K3 }# \3 F$ }2 F
Question:
6 }' e2 ]; G; u) XWhat isolation and loading requirements are applied to auto transformers?/ S5 ?& K7 f7 U K; L. z
Decision
; f$ i3 J- A. ]( D1 }1 k, m, bTests for loading are applied when applicable as for isolation transformers. No isolation6 P0 F( V x i1 a4 [( ^
requirements are applied between voltage outlets, however, care must be taken to ensure that9 i6 [' W0 o$ t7 |- O5 P- e
circuits separated by voltages are suitably isolated form one another to prevent short circuit* w: ?% m. z0 J) f9 _7 h. o, l* \
of the intervening winding.
$ R( z+ A6 J3 }1 ~Explanation) _. x7 f4 ^, @7 A- D. o+ @; }
Auto transformers are subject to overheating tests in the same way as isolating transformers,
# ?" w2 A* l& t/ W9 E; J3 ^: B; dhowever, they are not designed to provide isolation and these requirements are, therefore, not9 U+ Q* [6 y1 G2 I
applicable as there is direct connection between circuits." z7 v% F5 N: A
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