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head0819 发表于 2016-11-16 11:43  % V& O, i0 Q3 [# D( l
你把标准截图上来啊！
41 Test for Limited-Voltage/Current Circuit Transformers1 s; ~* |8 S( p1 f' ?
41.1 A transformer intended to power a limited-voltage/current circuit shall be tested as described in 41.2.& x# w# G/ C) { h9 }( i
41.2 The maximum volt-ampere output capacity of the secondary winding is to be determined as follows:
$ f. t& y( W* s: A( |! Q9 JAt room temperature, the primary winding of the transformer is to be connected as intended in the; M$ H2 B/ j1 A* Y1 Z! L: A+ `
equipment and the secondary winding in question is to be connected to a variable resistance load. When
3 |# D, f4 S1 Ha fixed-series impedance or regulator circuit is relied upon to limit the output, that impedance or regulator
9 i9 b9 J, |* q, o7 |" H3 s( H0 t5 U% {circuit is to be included in the circuit during the test. A multiple-winding transformer is to have one7 f6 {! u2 j2 j' f
secondary winding tested with all other secondary windings open-circuited, and is to be allowed to cool to
* d& n8 ~! X8 Q3 G$ Hroom temperature again before another winding is tested. A primary winding is to be connected to a' R& K D* x$ R5 j N" s; k3 E
source of rated voltage. The load on the secondary is to be varied in 10 increments from open-circuit to4 s: ~4 I8 B/ O2 v9 w S
short-circuit condition in 2-1/2 minutes. For each step or increment in the resistance, the product of the8 X: G. e. p0 v
output voltage and current is to be recorded, plotted, and run as a smooth curve. The peak value obtained! v4 f& V K2 `9 D
from the curve shall not exceed the volt-ampere value specified in Table 27.1. When two or more
* V" E1 U( z; N( ^. k3 [secondary windings supply interconnected circuits, the sum of the outputs of the windings in question shall
, ]7 K+ s6 X0 F, G% K* O0 M, W4 Onot exceed the values specified in Table 27.1./ P+ e q/ a5 l5 `3 f7 X* a6 D
% \0 j+ u) k: U3 r* r a做舞台灯的大部分都在广州及花都，2010-2012年间有多少家的舞台灯具被我拆的七零八落呢？ |
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发表于 2016-11-16 09:32
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发表于 2016-11-16 11:54
