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4 I* y! D: r8 L3 u1 w# C/ d | Mains Transformers
, K4 O" c$ m5 z9 R p$ K$ [ | 14.7: p2 d9 @1 U* x3 H' p- b- O
| 61010-1(ed.1);am1;am2
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9 J' h2 p$ y1 L" a7 _, U9 r; rStandard:
5 t7 v/ [- K: S! u# JIEC 61010-
5 r/ S0 k6 R! F8 o* _1:1990+A1:1992+A2:1995
) a' e# u( u ]9 {9 WSub clause:5 m# b9 A0 C8 q
14.7
+ t5 a( C( X, F- y0 l; }8 t/ \3 @Sheet n. 3148 D# p' D5 J F
Page 1(1)
5 m3 `8 B! }$ v6 T7 t' B' ~Subject:4 U: ?9 X7 |7 A
Mains transformers* i! I8 B. }6 Y4 I; l
Key words:& X) A3 h" ^* z1 {/ d! A4 f0 ~9 ~
- Isolation
' y% J2 H. {- {7 |7 R- Transformer
; c7 ]7 x! @, ~0 _5 t3 h. v4 R% X" ~Decision taken by
8 Q" @! A$ C2 U V8 XETF3 and confirmed
; a; s+ ]& X1 \; A6 Nby CTL at its 38th! t L9 Y- Y. l# B2 m8 U6 A! V o4 H
meeting, in Toronto7 I% ]2 }2 n6 S3 P& m
Question:
, }: S2 w; z( q$ b( hWhat isolation and loading requirements are applied to auto transformers?
Y9 y" i% \9 e( N3 o3 ]% \Decision
& t. L; X" b: @( bTests for loading are applied when applicable as for isolation transformers. No isolation
+ s: d8 s5 ^/ I: a( Qrequirements are applied between voltage outlets, however, care must be taken to ensure that! q8 A: [( K$ O" L
circuits separated by voltages are suitably isolated form one another to prevent short circuit
- E4 j8 [! j6 F( e6 p2 ]& wof the intervening winding.2 e7 f5 O# }6 c1 N
Explanation
! }- h. `5 [7 Q- A9 TAuto transformers are subject to overheating tests in the same way as isolating transformers,
4 Y8 b- a: \: K2 Y) [- l+ ahowever, they are not designed to provide isolation and these requirements are, therefore, not+ n; C( v6 U W8 b+ O
applicable as there is direct connection between circuits.' \# G* J0 n, k2 ^+ g: M# Z
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