DSH 359 Mains Transformers

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DSH 359 8 o) X+ y9 |/ }6 i" R! b0 W% W

Mains Transformers 7 H- x2 t" g0 v2 \

14.7

61010-1(ed.1);am1;am2 8 b8 u( u8 P3 W

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Standard:
IEC 61010-1:1990 +A1:1992 + A2
:1995
# p$ \- ]& h6 n, O( d/ PSub clause:
14.7
( T. [2 L, Z* C# f" R! SSheet n. 359
# s' g8 h# x& ]$ x; ^5 KPage 1(1)
" f: T5 E" ]& Q2 u9 a+ X5 W( @Subject:
6 j6 ]: X% d3 W% S' a0 [Mains transformers
Key words:
( P. M# ]7 i7 f7 n) o- Overload
- Temperature limits
Decision taken by
2 v+ L9 V0 J. [' Q% jETF3 and confirmed
4 r! M: i4 p2 C4 k6 t- h- F& M& Kby CTL at its 38th
" F" k) i2 \7 c+ O4 C! ameeting, in Toronto
Question:
1. What temperature limits are used?
0 o; D+ O7 e0 w$ Q2. The test specifies that the protective device is left in circuit but this will render the test
impractical if the device is a fuse, which may rupture in less than 1 hour. So how do
laboratories perform this test?
+ D  g1 t0 E. [0 L- k6 d, k3. "Directly Connected" can be seen as in many ways, can the laboratories share their
practice?
Decision:
It was agreed that;
& `$ p. b5 t6 H4 l7 r; N+ E1.Table 4 'Motor temperatures' should be referenced.
2. The test circuit should be arranged such that the test can continue for 1 hour.
3.The fuse should be connected such that no single fault condition between the transformer
and the fuse should cause a hazard.


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