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head0819 发表于 2016-11-16 11:43  0 J, k; V: D, u8 w
你把标准截图上来啊！
41 Test for Limited-Voltage/Current Circuit Transformers; M* N4 {6 Y) F) |2 Y. H# o z8 W
41.1 A transformer intended to power a limited-voltage/current circuit shall be tested as described in 41.2.
" f/ F2 B* x8 P6 p& a41.2 The maximum volt-ampere output capacity of the secondary winding is to be determined as follows:
- Y9 k3 Q9 I* d- fAt room temperature, the primary winding of the transformer is to be connected as intended in the, ~4 |3 ?" h3 K$ ?* m- _) v
equipment and the secondary winding in question is to be connected to a variable resistance load. When8 D' m8 ?1 I7 y( y
a fixed-series impedance or regulator circuit is relied upon to limit the output, that impedance or regulator
/ T$ J# c: w7 \1 b& n+ s+ [circuit is to be included in the circuit during the test. A multiple-winding transformer is to have one
/ L, g: @2 d0 y1 c8 Esecondary winding tested with all other secondary windings open-circuited, and is to be allowed to cool to6 p1 d& j& z2 E& W$ ~1 T
room temperature again before another winding is tested. A primary winding is to be connected to a
5 p9 |$ z8 d6 R% o/ S. osource of rated voltage. The load on the secondary is to be varied in 10 increments from open-circuit to
9 m, T& W7 T) `& Pshort-circuit condition in 2-1/2 minutes. For each step or increment in the resistance, the product of the
( X2 A4 t9 \% i; J8 G/ V8 ^output voltage and current is to be recorded, plotted, and run as a smooth curve. The peak value obtained
( x( U4 r1 r0 nfrom the curve shall not exceed the volt-ampere value specified in Table 27.1. When two or more8 y3 ?& A" e* n, ^7 u
secondary windings supply interconnected circuits, the sum of the outputs of the windings in question shall. x8 t. z( `$ v; I* s9 R6 j
not exceed the values specified in Table 27.1.# a- m" A, [, w, j5 R& G5 |
8 A- ?0 O8 D! ]# q; k5 g; v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
