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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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8 P: l. w# D5 A) b# l: BIn 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.
# i& R9 p% N$ F, s) hCompliance 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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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 s
' V9 k) Z% p( E! w9 e( x, JThe 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 measured2 ?( @) p3 w/ m9 E! i/ S$ Q
The test shall be considered to have been successfully passed if the partial discharge is less than 10 pC during the measurement period- k* m7 m8 O1 | t( M
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至于测试设备,网上一搜索就有了。, t% Z) B0 I6 C
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