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|
|  DSH 4182 P0 B; a& a& Y. X. _+ Y' u, y2 W
+ }4 ^- \5 j% e- h3 E, L
| Load resistance in relation to load current. e" F, C) v9 r6 o% V: ?! ]0 r3 `
| 57.9, 57.9.1- T0 V, M0 O; H
| 60601-1(ed.2);am1;am2; d1 l" m* q( u# s* p/ k3 j; K, ]
|
& o0 s0 _& P2 _/ `4 A0 [Standard(s)- (year and edition): W5 M3 ?) t4 t. T
IEC 60601-1:1988 Ed.2 Am1+Am2
9 I" Q* y, u( l9 H. W8 fSub clause(s): 57.9, 57.9.1
6 j: R8 b G8 F' {Sheet n°: DSH-4183 Y2 d$ L6 L% A$ X
Subject: Load resistance in relation to load current4 H; c1 W; D. S d
Key words: Load resistance, load current3 |9 H& s' R5 l0 }' T
Confirmed by CTL at its 39th meeti ng, in Cologne7 ^; z: a, ~0 t5 H) a2 i I
Question:+ {' K4 h) H2 S% G Q
Practically the test is performed with the winding under overload connected to a resistor with3 ~, U/ D* H& g. _
the resistance value that yields the correct test current in accordance with Table XX. As the: \5 n/ B! V5 c d/ Y: A
windings get heated during the test their resistance increases and one has to decrease the
, T& l- W# {* d7 N L' k9 Q& ~+ }value of the load resistor to keep the current in the fused circuit in accordance with Table XX
, |8 g" x c3 X; {' [( Aduring the test. Since the decrease of current is a result of the increase in the winding’s$ }2 x# t' V2 Z% _+ H9 A9 f
temperature, it seems to be an unrealistic fault condition to keep the current in the fused circuit
$ e" E8 E6 d! b l9 Junchanged instead of keeping the load resistance unchanged.% t: I8 q0 d0 c. A' G
Decision:
+ I! ]( A( L1 q+ L+ f) u2 m2 {5 ^The test load current must be maintained at its original value; P' H2 X; G3 d8 W5 @. Q5 R% K
3 M4 x8 ]' i* A
9 M9 N2 h" h5 C$ ~ |
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发表于 2012-11-5 11:06
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