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本帖最后由 清水白菜 于 2012-9-25 13:58 编辑 - f8 c3 s4 ?+ Y
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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.; y. j8 D* R; S
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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: U( z$ p4 G) w1 s6 U% `# I3 [Starting 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 s6 \ {& r$ Y+ T$ E1 O5 m$ P! c
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, A# J; D2 Y& S' O" B8 f n8 O$ ]( J
The test shall be considered to have been successfully passed if the partial discharge is less than 10 pC during the measurement period
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% \0 J( K0 b( I L& V至于测试设备,网上一搜索就有了。
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