DSH 359 Mains Transformers

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DSH 359 : ^6 \" F) b9 `( z; g/ @4 x

Mains Transformers

14.7 * @8 e3 \( u7 U! t/ u4 T2 k

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

1 h2 S" h/ x5 z4 W% aStandard:
- R8 f5 A7 t9 E5 h# l3 G2 GIEC 61010-1:1990 +A1:1992 + A2
5 @. F0 G1 @' o:1995
Sub clause:
14.7
, T, T  I: N1 w3 J# W% @# YSheet n. 359
Page 1(1)
Subject:
Mains transformers
Key words:
0 I9 y% f7 M1 k5 x4 ^+ c& M- Overload
4 n" I. L; j! E  m/ s- Temperature limits
Decision taken by
ETF3 and confirmed
by CTL at its 38th
meeting, in Toronto
0 @, h0 y* J' s8 \& aQuestion:
% L% u. A" \, R1 i1. What temperature limits are used?
4 O0 G6 i3 N2 X5 [2. The test specifies that the protective device is left in circuit but this will render the test
( ?2 O: L5 k0 g7 himpractical if the device is a fuse, which may rupture in less than 1 hour. So how do
laboratories perform this test?
- Y2 h9 y" ?" q6 _1 b& ^, J3. "Directly Connected" can be seen as in many ways, can the laboratories share their
& o+ L; J6 r! T! \- Ppractice?
/ z, j% k2 t" hDecision:
It was agreed that;
) Y- i" Y3 k5 F: j: U3 F$ Z1.Table 4 'Motor temperatures' should be referenced.
2. The test circuit should be arranged such that the test can continue for 1 hour.
! `1 K+ a, J. _! j; w3.The fuse should be connected such that no single fault condition between the transformer
3 z* i4 I7 N0 pand the fuse should cause a hazard.

! H  u! |1 p! B. c$ u
- `1 B' |( f2 b$ Q4 Q0 f, Z! \