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head0819 发表于 2016-11-16 11:43  $ Y5 w' p2 J2 i5 x- C6 o( b
你把标准截图上来啊！
41 Test for Limited-Voltage/Current Circuit Transformers
7 l/ ~; o' n0 h& z0 h41.1 A transformer intended to power a limited-voltage/current circuit shall be tested as described in 41.2.2 i% q+ W9 ?! I! w
41.2 The maximum volt-ampere output capacity of the secondary winding is to be determined as follows:: X8 S- v: I8 `% f' Z$ P! ^
At room temperature, the primary winding of the transformer is to be connected as intended in the
& }) ~2 s: c8 ]- {% g8 A+ k% Hequipment and the secondary winding in question is to be connected to a variable resistance load. When
9 R# Y7 ^* e! w/ `6 b9 pa fixed-series impedance or regulator circuit is relied upon to limit the output, that impedance or regulator
R/ g0 Y3 G% @* ccircuit is to be included in the circuit during the test. A multiple-winding transformer is to have one6 p- } z" R6 m. p8 X. J
secondary winding tested with all other secondary windings open-circuited, and is to be allowed to cool to
7 N7 N4 u$ o$ v' G1 M0 `0 Q Nroom temperature again before another winding is tested. A primary winding is to be connected to a
, r( ?& @. J6 d; |7 Rsource of rated voltage. The load on the secondary is to be varied in 10 increments from open-circuit to; u6 D/ z( _+ s8 a9 r
short-circuit condition in 2-1/2 minutes. For each step or increment in the resistance, the product of the
* T/ k6 i2 I1 E0 d eoutput voltage and current is to be recorded, plotted, and run as a smooth curve. The peak value obtained
! Q! L! r' }" G+ r: lfrom the curve shall not exceed the volt-ampere value specified in Table 27.1. When two or more
6 K8 y/ V( B3 G! R/ D) ~secondary windings supply interconnected circuits, the sum of the outputs of the windings in question shall
5 l! N6 Q6 h5 Cnot exceed the values specified in Table 27.1.
8 Z( ] O8 }' l) g/ ]" n& G; l) q! C2 A
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 11:54
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