|
head0819 发表于 2016-11-16 11:43
# R: B* W! l8 y" U- M你把标准截图上来啊!
r( P' J8 y& z: I8 z41 Test for Limited-Voltage/Current Circuit Transformers {7 A& H1 \# S
41.1 A transformer intended to power a limited-voltage/current circuit shall be tested as described in 41.2.
; o7 x a( D2 K" n9 y; U41.2 The maximum volt-ampere output capacity of the secondary winding is to be determined as follows:
`% ?2 M/ S5 y5 Q, XAt room temperature, the primary winding of the transformer is to be connected as intended in the
& q2 _% x0 e0 S6 n2 Pequipment and the secondary winding in question is to be connected to a variable resistance load. When
" ?) B' V9 q( g* K( H' Sa fixed-series impedance or regulator circuit is relied upon to limit the output, that impedance or regulator
# n& f. h# t: H4 ccircuit is to be included in the circuit during the test. A multiple-winding transformer is to have one: d( v# V' D7 w' E" b( A! B0 \
secondary winding tested with all other secondary windings open-circuited, and is to be allowed to cool to
# h9 p& F8 y1 v- |8 B) yroom temperature again before another winding is tested. A primary winding is to be connected to a
* ~. M7 D8 C! \9 L0 p! i) Tsource of rated voltage. The load on the secondary is to be varied in 10 increments from open-circuit to
+ B7 W$ h+ D: H0 U% Ushort-circuit condition in 2-1/2 minutes. For each step or increment in the resistance, the product of the
* ~: w( h c) K7 ]* r* X5 Aoutput voltage and current is to be recorded, plotted, and run as a smooth curve. The peak value obtained
- F3 `8 u. U! _4 [( H" h4 E4 g' Mfrom the curve shall not exceed the volt-ampere value specified in Table 27.1. When two or more
5 Y1 m3 l2 r) z1 p) X l- `- isecondary windings supply interconnected circuits, the sum of the outputs of the windings in question shall
1 t g+ o& D, {& hnot exceed the values specified in Table 27.1.7 W" R9 r4 Z- ?+ E" A8 S- U
X& w: q+ J8 e3 T9 V+ c j1 s/ l
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? |
|