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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.& n9 s0 r4 p! S5 J+ {, _
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 s
n8 \& V* E% {/ ^4 C: c e1 o2 ]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
' f* e" B' i- S' BThe test shall be considered to have been successfully passed if the partial discharge is less than 10 pC during the measurement period! o, b3 P, w- y* b/ V2 @6 n$ j4 c
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至于测试设备,网上一搜索就有了。+ k# Q6 d; A2 e' S# a$ ?' @) f; I
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