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| PDSH 1022
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! g a7 u& U9 q' H# D/ D! K. q5 X | Short circuit and overload protection
4 G2 x1 V W! d4 E n | 15.3.2
8 ]6 F* m0 p) d7 r% W | 61558-1(ed.1);am1 & 61558-1(ed.2);am1/ ~9 K+ F4 h w$ m8 V$ |4 y
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Standard(s):
" O6 j" G; Y b$ H& Y- N4 HIEC 61558-1
) V& k6 g. g, f! \' U" @' }All editions, C& [% t3 k6 f; E# }( F7 H
Subclause(s):
: c- A4 L) j- |* ~15.3.27 b6 _# ^& V* K6 Y1 Z3 h9 ]
No. Year
5 J6 K# i; `2 t6 G- Q' H: |PDSH
) d( y s2 @/ O2 o8 {7 ]. K5 L# H1022 2010
$ i# U" x2 U( e. ?' h5 l7 G& bCategory: SAFE Developed by: ETF5/ e- b X: N' s, p
OSM/LUM
5 n+ A) g H* oSubject:
" `+ r4 X4 Y) J% |% v, D- `: Q5 E2 AShort circuit and overload; ?" e N& s# ?% D1 F/ P
protection
6 P4 y' R9 D. |# x3 K7 h4 m/ l4 C. BKey words:( s( x# R% Y" z
- Fuse current: i5 A% y5 c7 Z9 B) c) w, `6 a
- Overloading test l/ b( l2 i) X8 r F6 b8 D
- Overload current
2 s& K u' B) j1 o& l" lTo be approved at the 49th' R, U2 p( t0 H! |$ O
CTL Plenary Meeting, in 2012
$ _5 z5 A3 R3 L5 B( c" P FQuestion:( m Q, e5 D9 G% W! ^4 s6 P
During the overloading test on the transformer according to § 15.3.2 the temperature of the windings and5 T! g. j. A) \5 Y" j
their resistance increase and consequently the overload current decreases. Has the fuse current be
$ k2 ?* ^+ e1 J% [2 |) P" ureadjusted to the original overload current during the test or no adjustment has to be made?2 a0 \: g: C+ f8 k/ o
Decision:* d0 o0 v5 j9 T+ J) K6 p
The fuse current has to be kept constant during the test./ H9 n1 Q3 {( j3 }' S9 Z! B
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