DSH 541 Transformer overload

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DSH 541 , O7 X" B3 u$ N1 R# i% e   T+ ]  C5 \1 R; J5 {; V' Z

Transformer overload

4.3, 11

60065(ed.6)

Standard(s)-(year and edition):
IEC 60065 (1998) 6th Ed
Sub clause(s):
4.3, 11
Dec. No.
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Subject:
Transformer overload
/ N3 x; F; Y/ F8 d, g6 S" j  L- W: H, rKey words:
FAULT CONDITIONS
Decision of:
- d- q- a) x" v' i0 y40th CTL meeting /2003
* v9 K* h! H6 N$ A/ q5 HQuestion:
. S' `" N5 U; Y# o; P* S9 ]% M1 LThe standard does not specify a transformer overload test, as there is, , for example, in IEC 60950.,
If it is obvious, based on engineering judgment of the technical design of the product, that
due to a single fault condition (e.g. component failures, short circuit of functional insulation)
2 b0 v9 F! [6 r" ran overload situation on a transformer is likely to occur, which approach should be
- S* D, H7 l' q8 Hfollowed?
1) The actual overload on the transformer shall be performed, taking into account the 'characteristics' of
eventual protective devices.
+ R9 J8 k" b) g/ ]- c2) All possible single fault conditions shall be performed. For those situations where the protective
& L  J5 Z, q! C3 \4 rdevice reacts, the current through the protector shall be measured and the characteristic of the
protector shall be taken into account.
/ A; Y8 O& X3 W" P* Z3) No overload condition shall be created, since the standard does not specify this in wording.
4) Other possibilities.
5 w- S: Q, X$ @0 U: IDecision:
Following the standard option 2 from above has to be used.


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