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head0819 发表于 2016-11-16 11:43 
& \, D% B- B9 G# G# j) T+ i你把标准截图上来啊！
41 Test for Limited-Voltage/Current Circuit Transformers0 h2 k! n# _7 r6 p* F# a
41.1 A transformer intended to power a limited-voltage/current circuit shall be tested as described in 41.2.
: H9 {) u2 u$ ? E41.2 The maximum volt-ampere output capacity of the secondary winding is to be determined as follows:
6 c& f/ _/ S2 i8 vAt room temperature, the primary winding of the transformer is to be connected as intended in the
* b, y. p& N+ X7 Uequipment and the secondary winding in question is to be connected to a variable resistance load. When: a+ U8 }9 a, l, U5 F5 i9 o/ h
a fixed-series impedance or regulator circuit is relied upon to limit the output, that impedance or regulator& @. e8 x2 h7 F
circuit is to be included in the circuit during the test. A multiple-winding transformer is to have one
& B. g3 p( s3 i, ~0 d1 c7 I4 X8 A6 zsecondary winding tested with all other secondary windings open-circuited, and is to be allowed to cool to% z9 o+ E% k( r4 Q
room temperature again before another winding is tested. A primary winding is to be connected to a
. K7 ]) V1 }; i% Nsource of rated voltage. The load on the secondary is to be varied in 10 increments from open-circuit to
6 g. U3 [$ w& I6 v3 Rshort-circuit condition in 2-1/2 minutes. For each step or increment in the resistance, the product of the
$ {+ d6 D& V$ @3 O" G9 Joutput voltage and current is to be recorded, plotted, and run as a smooth curve. The peak value obtained
0 ]+ d: @4 p0 B* |% Ffrom the curve shall not exceed the volt-ampere value specified in Table 27.1. When two or more
" {4 e9 h4 k' n1 N4 n) Nsecondary windings supply interconnected circuits, the sum of the outputs of the windings in question shall
, i" Q& t- h1 b9 B0 A& Knot exceed the values specified in Table 27.1./ M, m. M% x( K: H% r
y/ [, z- v- `8 i% O) z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
