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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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4 `. I* J& `4 h4 iIn 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.* q8 F% B; ^# q }- `/ U* Z/ |* z- m
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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! t7 g; X2 c0 U! M* RStarting 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
$ Y! i# F1 b0 {, A* F ^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. ~1 V& @: J$ D1 j
The test shall be considered to have been successfully passed if the partial discharge is less than 10 pC during the measurement period c4 F# i6 T7 w) Y8 m
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至于测试设备,网上一搜索就有了。# }" d8 n# c5 K- q5 ^
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