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head0819 发表于 2016-11-16 11:43 
4 y7 R) f6 c5 K8 Z( Z你把标准截图上来啊！
E# Y' c" z" A41 Test for Limited-Voltage/Current Circuit Transformers
6 J/ o/ t4 o: V41.1 A transformer intended to power a limited-voltage/current circuit shall be tested as described in 41.2.
- j- A7 O. D' v" n8 \ z5 w& Q7 S41.2 The maximum volt-ampere output capacity of the secondary winding is to be determined as follows:
$ s2 t$ i# E# V( |! C$ ~& E5 Q, iAt room temperature, the primary winding of the transformer is to be connected as intended in the- k4 Q' G! \$ ~: q* c9 L. n
equipment and the secondary winding in question is to be connected to a variable resistance load. When/ P I0 D3 J6 Z
a fixed-series impedance or regulator circuit is relied upon to limit the output, that impedance or regulator8 R' D7 A3 h; D7 H
circuit is to be included in the circuit during the test. A multiple-winding transformer is to have one
- N6 W; j/ z1 Y8 K( b! L8 Psecondary winding tested with all other secondary windings open-circuited, and is to be allowed to cool to. F) h/ s& Y$ G. u5 r$ }
room temperature again before another winding is tested. A primary winding is to be connected to a) I: G% }6 N) z$ h& ~- P/ g, j
source of rated voltage. The load on the secondary is to be varied in 10 increments from open-circuit to( Z. S6 h5 { ]8 c* l" u
short-circuit condition in 2-1/2 minutes. For each step or increment in the resistance, the product of the; W U M8 W* ^$ Q! o! v$ d2 w
output voltage and current is to be recorded, plotted, and run as a smooth curve. The peak value obtained8 Z/ ^! Q" e7 x5 F6 x
from the curve shall not exceed the volt-ampere value specified in Table 27.1. When two or more
, B& z: u7 y& q0 Q2 Asecondary windings supply interconnected circuits, the sum of the outputs of the windings in question shall' L+ z4 Q! _5 L7 p5 K9 K1 U
not exceed the values specified in Table 27.1.
7 i. B3 p H/ R9 X7 v/ F$ [5 l3 {8 i# F" D. R
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
