标题: UL1573 41.2 test for limited - voltage / current circuit transformers 怎么测试 [打印本页] 作者: Strive1 时间: 2016-11-16 09:32 标题: UL1573 41.2 test for limited - voltage / current circuit transformers 怎么测试 UL1573 41.2 test for limited - voltage / current circuit transformers 怎么测试 ! W* ?4 N9 Z8 F! K G M5 K+ d作者: head0819 时间: 2016-11-16 11:43
你把标准截图上来啊！作者: fasten 时间: 2016-11-16 11:54
9 n5 {& i9 b/ v- o* i% a. q# k
41 Test for Limited-Voltage/Current Circuit Transformers : x9 L/ l3 S7 q: B* ?* S4 @0 c" g41.1 A transformer intended to power a limited-voltage/current circuit shall be tested as described in 41.2., U ]2 y/ | w. o
41.2 The maximum volt-ampere output capacity of the secondary winding is to be determined as follows:9 l* I& Z8 e" k6 x& {! o2 E
At room temperature, the primary winding of the transformer is to be connected as intended in the ) ^: A* Y; i+ F0 Lequipment and the secondary winding in question is to be connected to a variable resistance load. When & [9 K0 R+ e5 F0 wa fixed-series impedance or regulator circuit is relied upon to limit the output, that impedance or regulator 7 ~# K% Y: C' Y' I8 ]" N! {circuit is to be included in the circuit during the test. A multiple-winding transformer is to have one" \# p& L5 Z Y. g# ~1 p8 G
secondary winding tested with all other secondary windings open-circuited, and is to be allowed to cool to1 y* m$ { H; L8 i6 D6 M
room temperature again before another winding is tested. A primary winding is to be connected to a 2 N. f! q; E9 k3 V: D- S7 @% q1 Fsource of rated voltage. The load on the secondary is to be varied in 10 increments from open-circuit to ! G6 K+ i/ q5 P& Ashort-circuit condition in 2-1/2 minutes. For each step or increment in the resistance, the product of the. [1 n1 A8 i- y8 }
output voltage and current is to be recorded, plotted, and run as a smooth curve. The peak value obtained / D1 j5 `* Y, gfrom the curve shall not exceed the volt-ampere value specified in Table 27.1. When two or more: [/ G# B/ t. |& R
secondary windings supply interconnected circuits, the sum of the outputs of the windings in question shall 9 ~- @; A' g3 \, C' o4 F- Knot exceed the values specified in Table 27.1.0 x9 [- I9 ]6 l/ P! M# L& s
