5 o% c1 r1 m( t; |6 y o+ @In addition, double and reinforced insulation shall withstand the partial discharge test according to 7.5.3, if the recurring peak working voltage across the insulation is greater than 700 V and the voltage stress on the insulation is greater than 1 kV/mm. : _# Y' O. n. }Compliance is shown by impulse withstand voltage test according to 7.5.1 and the a.c. or d.c. voltage test according to 7.5.2, and partial discharge testing according to 7.5.3 if applicable. 5 X9 L$ O9 ?' g5 n ; z! a/ @4 `( {" z! c" TStarting from a voltage below the rated discharge voltage UPD a, the voltage shall be linearly increased to 1,875 times UPD and held for a maximum time of 5 s ) g4 K n- ~/ N0 T+ _4 C0 hThe voltage shall then be linearly decreased to 1,5 times UPD (± 5 %) and held for a maximum time of 15 s, during which the partial discharge is measured# d h' B6 a1 p R1 b; I
The test shall be considered to have been successfully passed if the partial discharge is less than 10 pC during the measurement period + p* h7 l6 o! G; o9 c; a8 g) E8 g; w$ d2 r) ?9 j7 P7 x8 \1 u# f0 N+ r
至于测试设备，网上一搜索就有了。/ G# J' h- w$ ] 作者: lu-zgsh 时间: 2012-9-26 12:29
来学习作者: ok_hmh 时间: 2012-9-27 11:28
UPD 是哪个电压？作者: feiniaoo 时间: 2013-5-4 17:19
