DSH 359 Mains Transformers

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DSH 359 7 W3 }3 Z% y7 h

Mains Transformers

14.7

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

Standard:
IEC 61010-1:1990 +A1:1992 + A2
:1995
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14.7
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Subject:
: C& ]8 I1 E, q' A9 RMains transformers
Key words:
- Overload
- Temperature limits
Decision taken by
% C9 i* o, q9 f8 m; M) C" f7 `ETF3 and confirmed
by CTL at its 38th
  I( N* C! b2 q8 {* A- S, Umeeting, in Toronto
, n2 o' i2 z, r% V6 k) dQuestion:
, A; d1 }0 J) r. S# B* a1. What temperature limits are used?
2. The test specifies that the protective device is left in circuit but this will render the test
  `5 b: V# O  M. r8 G3 U. C* qimpractical if the device is a fuse, which may rupture in less than 1 hour. So how do
laboratories perform this test?
1 s, F" ~( A0 j  O3. "Directly Connected" can be seen as in many ways, can the laboratories share their
& Y: Q! \, [, @1 y+ apractice?
3 Z" }. O1 `4 N7 `Decision:
It was agreed that;
( g! e; g0 e; y5 U) H1.Table 4 'Motor temperatures' should be referenced.
6 x$ A0 t* F6 L. W& _8 s2. The test circuit should be arranged such that the test can continue for 1 hour.
; `) b. H1 M& k0 e. Z' p3.The fuse should be connected such that no single fault condition between the transformer
7 K4 x; h0 M  Y5 G" Land the fuse should cause a hazard.

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