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head0819 发表于 2016-11-16 11:43  % s/ I1 Q1 K5 y% V
你把标准截图上来啊！
; s, |' \/ @; X" _' o( a41 Test for Limited-Voltage/Current Circuit Transformers0 ?0 {" j B+ p$ _7 j
41.1 A transformer intended to power a limited-voltage/current circuit shall be tested as described in 41.2.
1 w0 _' E5 i* J6 I X" \4 t41.2 The maximum volt-ampere output capacity of the secondary winding is to be determined as follows:" t) a6 H" \- }6 g
At room temperature, the primary winding of the transformer is to be connected as intended in the
" `8 i5 g1 e% I: {3 Z- lequipment and the secondary winding in question is to be connected to a variable resistance load. When1 O% M4 [1 N5 L
a fixed-series impedance or regulator circuit is relied upon to limit the output, that impedance or regulator
3 q0 R1 ~0 z9 O) ^& O- Ncircuit is to be included in the circuit during the test. A multiple-winding transformer is to have one
; b/ N- }2 I+ @secondary winding tested with all other secondary windings open-circuited, and is to be allowed to cool to
2 o- _ M2 ]* Q6 F( }& z& S k5 broom temperature again before another winding is tested. A primary winding is to be connected to a0 P$ R- C$ H( v5 J/ T. X# V- E
source of rated voltage. The load on the secondary is to be varied in 10 increments from open-circuit to# j* p/ | R1 t: Z: I
short-circuit condition in 2-1/2 minutes. For each step or increment in the resistance, the product of the
6 h( ?$ g8 I( K0 Eoutput voltage and current is to be recorded, plotted, and run as a smooth curve. The peak value obtained
: p, n3 r9 ]& b* d' w4 xfrom the curve shall not exceed the volt-ampere value specified in Table 27.1. When two or more: y( o+ d# g& g* h4 x; N
secondary windings supply interconnected circuits, the sum of the outputs of the windings in question shall
1 [/ v5 h6 i9 P, C# q1 cnot exceed the values specified in Table 27.1.2 t6 A, N& C! X$ e' U% D
* G4 B7 U# ]7 n) ^9 D8 ~+ m' W. P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
