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head0819 发表于 2016-11-16 11:43
* |: E' z; Q: y# s# {4 \你把标准截图上来啊!
( @% D2 d( x, H) ]3 W41 Test for Limited-Voltage/Current Circuit Transformers
; y1 l, H9 J& e+ u# D7 u# O7 F# |41.1 A transformer intended to power a limited-voltage/current circuit shall be tested as described in 41.2.! X* L9 s, _; I
41.2 The maximum volt-ampere output capacity of the secondary winding is to be determined as follows:, u' e8 Z9 ]6 [4 d, E+ b5 ~
At room temperature, the primary winding of the transformer is to be connected as intended in the3 a8 t1 p7 c v8 v0 N
equipment and the secondary winding in question is to be connected to a variable resistance load. When! c3 a1 u0 f+ m: L8 h. q# ?8 f
a fixed-series impedance or regulator circuit is relied upon to limit the output, that impedance or regulator
9 i% G& a$ s# N2 }) q* I" ?9 _circuit is to be included in the circuit during the test. A multiple-winding transformer is to have one+ ]: R' X1 S8 K" t8 X3 c( z
secondary winding tested with all other secondary windings open-circuited, and is to be allowed to cool to( {6 Z7 U. s, S
room temperature again before another winding is tested. A primary winding is to be connected to a
/ d- l: q" m3 B% M8 K% ?source of rated voltage. The load on the secondary is to be varied in 10 increments from open-circuit to
V7 v( ?& r. _. X8 ]short-circuit condition in 2-1/2 minutes. For each step or increment in the resistance, the product of the
, f! r$ t* c5 @! E+ `/ noutput voltage and current is to be recorded, plotted, and run as a smooth curve. The peak value obtained
9 A; |1 ^! r- _ Jfrom the curve shall not exceed the volt-ampere value specified in Table 27.1. When two or more
* d* x' j. P4 ^secondary windings supply interconnected circuits, the sum of the outputs of the windings in question shall7 c+ r6 |" b9 Z
not exceed the values specified in Table 27.1.6 w2 ~% z) A# p
7 j& o% s3 [/ ^$ X, u/ T
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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