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head0819 发表于 2016-11-16 11:43 
1 o. Z* E0 e" C- j2 v3 R% V/ M3 V8 x你把标准截图上来啊！
41 Test for Limited-Voltage/Current Circuit Transformers" ]+ [" e$ M/ H( n
41.1 A transformer intended to power a limited-voltage/current circuit shall be tested as described in 41.2., f& X; U( _! u% ^% O
41.2 The maximum volt-ampere output capacity of the secondary winding is to be determined as follows:
9 S/ x& c, e7 b* d- ^7 C. BAt room temperature, the primary winding of the transformer is to be connected as intended in the5 T# _& a- I' U# N
equipment and the secondary winding in question is to be connected to a variable resistance load. When# I3 u" ^; n; n r; c7 [9 x8 j# Y7 a( C
a fixed-series impedance or regulator circuit is relied upon to limit the output, that impedance or regulator$ {3 j% M$ c. X: I* @& M
circuit is to be included in the circuit during the test. A multiple-winding transformer is to have one
, g* z2 ~" \; @: _' bsecondary winding tested with all other secondary windings open-circuited, and is to be allowed to cool to
7 V; Q: c) t* u! C- c2 froom temperature again before another winding is tested. A primary winding is to be connected to a
% v b% H, Q" Q) a* X" y8 y6 ssource of rated voltage. The load on the secondary is to be varied in 10 increments from open-circuit to% _4 ^) u9 L' T- c
short-circuit condition in 2-1/2 minutes. For each step or increment in the resistance, the product of the
) s/ \" K5 C1 P. h5 u0 {3 Loutput voltage and current is to be recorded, plotted, and run as a smooth curve. The peak value obtained& _( S& X; `, c9 p5 [1 `; n! y4 a
from the curve shall not exceed the volt-ampere value specified in Table 27.1. When two or more; P; I1 K. m) @! ~# a, ~6 _
secondary windings supply interconnected circuits, the sum of the outputs of the windings in question shall9 m3 v- s* S& {$ q, V# Q
not exceed the values specified in Table 27.1.
7 W' T5 }, s# n8 e' I3 s1 r
) g3 J, z2 X: v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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