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本帖最后由 清水白菜 于 2012-9-25 13:58 编辑
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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.- g: q: L+ c, l. u6 A) {9 r
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.
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% g" O( B. b6 s) p* W( S8 mStarting 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. f4 u3 x5 R) a- v. u0 z) k% A
The 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
2 o: K x; f/ _( K$ h* qThe test shall be considered to have been successfully passed if the partial discharge is less than 10 pC during the measurement period3 c* |5 i- X6 @; o. P: K
* X5 L* U+ u1 b- j& k7 U至于测试设备,网上一搜索就有了。
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