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近期遇见一个静电式空气净化器,内部由高压变压器供电电离丝,用电离丝和电板间的电离作用吸附灰尘。电离丝对地电压8000V。
: @" c9 o4 d4 R" ]8 M! v4 V9 d" A335-2-65中cl. 16.101规定:
5 W9 {9 o" w6 v16.101 High-voltage transformers shall have adequate internal insulation.
8 m% T% m; H- h D# ?; k/ k( v' uCompliance is checked by the following test.
3 A5 a; X5 _$ Q/ ?* vTwice the working voltage is induced in the secondary winding of the transformer by
- s. J* P' a, g# ?4 |9 X! Qapplying a sinusoidal voltage having a frequency higher than rated frequency to the primary
/ ~% }8 K, Z! ^+ gterminals.. `( J9 L; Y2 I! v
The duration of the test is% J4 r$ P% x5 q+ `7 |
– 60 s, for frequencies up to twice the rated frequency, or" z8 p3 V( L$ h4 q ?4 N
– 120 × rated frequency / test frequency s, with a minimum of 15 s, for higher frequencies.* k" c E: _0 B8 j! g# d
& b6 ?3 b, r& h- [8 l: ^! ]+ l! @要求对高压变压器进行两倍工作电压的耐压测试。
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! P" \2 z/ \( P2 y" d x那么测试电压就是16kV!!! 频率可以增高,以避免着火等危险。6 ]" b7 W6 \1 w: K U$ `) h1 ^ c( D; n
& i; u) _1 V" d9 e( c但能够提供16kV的耐压仪去哪里找?哪位做过此项试验? P4 b% K* u0 e+ l: w5 ?8 f8 e
; ~+ |7 s2 M1 J, {2 ^另外,此变压器初次级的爬电距离和电气间隙按照工作电压来判定,岂不要求很大很大?!
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也可能我理解错误,欢迎指正。 |
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