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head0819 发表于 2016-11-16 11:43  ! [+ C* `8 {" K+ ^, U1 N4 Y
你把标准截图上来啊！
41 Test for Limited-Voltage/Current Circuit Transformers4 |" B2 A$ p {# F9 Y5 ~8 g
41.1 A transformer intended to power a limited-voltage/current circuit shall be tested as described in 41.2.
/ t. T4 @3 A$ x9 I. ^: g: c9 b41.2 The maximum volt-ampere output capacity of the secondary winding is to be determined as follows:+ H" W$ j5 x3 _5 ?$ ]6 Z$ T0 z
At room temperature, the primary winding of the transformer is to be connected as intended in the& C' d2 O C, W
equipment and the secondary winding in question is to be connected to a variable resistance load. When
/ I0 K+ V% E( o' z2 ra fixed-series impedance or regulator circuit is relied upon to limit the output, that impedance or regulator
8 W- t5 _% Z7 [; ncircuit is to be included in the circuit during the test. A multiple-winding transformer is to have one
! S# y! H2 ?9 qsecondary winding tested with all other secondary windings open-circuited, and is to be allowed to cool to
& q1 U x8 Y3 M6 f0 K/ D! Qroom temperature again before another winding is tested. A primary winding is to be connected to a
( o; J; a. J. p! }( ?source of rated voltage. The load on the secondary is to be varied in 10 increments from open-circuit to
/ X6 I2 t0 d! x @6 ] B8 Cshort-circuit condition in 2-1/2 minutes. For each step or increment in the resistance, the product of the
/ ~2 o2 ?1 r# d$ S; ]) coutput voltage and current is to be recorded, plotted, and run as a smooth curve. The peak value obtained
+ b* e1 a' v7 E- \$ c+ r+ s1 Kfrom the curve shall not exceed the volt-ampere value specified in Table 27.1. When two or more
4 a4 W6 n T0 c5 g: \ Vsecondary windings supply interconnected circuits, the sum of the outputs of the windings in question shall
8 |5 f1 Q6 }- v/ z' s% Gnot exceed the values specified in Table 27.1.6 {! R( G! s0 t/ M7 B6 U
& `# N7 g' R3 P8 s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
