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head0819 发表于 2016-11-16 11:43 ![](static/image/common/back.gif)
, s1 T+ Q W- Y你把标准截图上来啊! ( g4 [9 g1 ?+ p6 p* H9 }6 u
41 Test for Limited-Voltage/Current Circuit Transformers
* n t6 j J9 V; F5 {41.1 A transformer intended to power a limited-voltage/current circuit shall be tested as described in 41.2.
: m) J0 o4 l( k3 r8 B% x41.2 The maximum volt-ampere output capacity of the secondary winding is to be determined as follows:" d' M- w T" d
At room temperature, the primary winding of the transformer is to be connected as intended in the
% v' {; ~+ v! A/ n$ ?& `equipment and the secondary winding in question is to be connected to a variable resistance load. When0 m! l# G. _ Q P
a fixed-series impedance or regulator circuit is relied upon to limit the output, that impedance or regulator5 R; x4 ^3 O" e- A4 n
circuit is to be included in the circuit during the test. A multiple-winding transformer is to have one
2 u% E0 v9 t) x$ F" Ksecondary winding tested with all other secondary windings open-circuited, and is to be allowed to cool to2 H) h/ U4 Z9 A/ D$ q& W3 [' u! G8 y
room temperature again before another winding is tested. A primary winding is to be connected to a: I: f7 K2 H$ K9 t
source of rated voltage. The load on the secondary is to be varied in 10 increments from open-circuit to
7 P& @ G* z9 F) }- Z$ n9 Fshort-circuit condition in 2-1/2 minutes. For each step or increment in the resistance, the product of the" _& q% ?/ v' R9 h O! o2 G9 S
output voltage and current is to be recorded, plotted, and run as a smooth curve. The peak value obtained
( g1 f+ L: a; ~& J# gfrom the curve shall not exceed the volt-ampere value specified in Table 27.1. When two or more" Q9 y, t* Z# H% ?. ]( X7 E
secondary windings supply interconnected circuits, the sum of the outputs of the windings in question shall- ?4 a2 A9 @- |/ T9 I3 ?
not exceed the values specified in Table 27.1.: s9 p' g( l( o
3 n/ A7 f$ C6 ?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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