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本帖最后由 清水白菜 于 2012-9-25 13:58 编辑 & f8 E; w0 \- @$ C
5 M" r2 a. T* i* w% EIn 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.5 t7 L$ n& P6 X( S0 F" q
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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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 s1 R5 h7 d5 M+ y t( H+ \
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 measured6 n) t1 s6 R9 K$ e
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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. d3 o7 r5 ` M3 |至于测试设备,网上一搜索就有了。0 ]* e$ U2 Z4 a
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