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head0819 发表于 2016-11-16 11:43
% M! _- U4 _: S- H6 ^你把标准截图上来啊! 2 t! g' x9 L* d% t3 Y F$ x; l
41 Test for Limited-Voltage/Current Circuit Transformers" b, v, f. K; B5 x* y; G
41.1 A transformer intended to power a limited-voltage/current circuit shall be tested as described in 41.2.8 x9 G3 {8 r: ^& X0 Q
41.2 The maximum volt-ampere output capacity of the secondary winding is to be determined as follows:
" F+ k, n: B2 ^5 t2 zAt room temperature, the primary winding of the transformer is to be connected as intended in the
9 G+ r9 K- B+ R+ ^+ e3 ~0 \equipment and the secondary winding in question is to be connected to a variable resistance load. When5 Z8 B* ~. n/ S0 s1 T/ ?- Y. H9 L
a fixed-series impedance or regulator circuit is relied upon to limit the output, that impedance or regulator, X, G5 q# @0 A1 Z: ^7 l
circuit is to be included in the circuit during the test. A multiple-winding transformer is to have one# o( ]4 j, T* G. u& b
secondary winding tested with all other secondary windings open-circuited, and is to be allowed to cool to0 F; O) S/ n+ G: [% V7 d
room temperature again before another winding is tested. A primary winding is to be connected to a
# i' D9 U/ p' Y% R/ x- Y: ^! T9 hsource of rated voltage. The load on the secondary is to be varied in 10 increments from open-circuit to* [+ E2 t; n) x8 e. l$ a
short-circuit condition in 2-1/2 minutes. For each step or increment in the resistance, the product of the; V& O, e/ s1 y4 R
output voltage and current is to be recorded, plotted, and run as a smooth curve. The peak value obtained% H. ]9 h' p. P* s( x0 F
from the curve shall not exceed the volt-ampere value specified in Table 27.1. When two or more
! j6 h4 t, }: j5 Wsecondary windings supply interconnected circuits, the sum of the outputs of the windings in question shall+ x& v; [; n, q/ O% Z. `# g
not exceed the values specified in Table 27.1.
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' B8 |8 _2 }% h+ s1 @, k) {9 m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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