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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。
. x% \0 x# G" Y* ]1 Q4 P335-2-65中cl. 16.101规定:6 b* R8 t* u: f _: D/ w
16.101 High-voltage transformers shall have adequate internal insulation.
1 \8 K1 ]- Y4 Z5 ^" ]1 s$ _7 ECompliance is checked by the following test.
9 k$ c" \% t3 D/ TTwice the working voltage is induced in the secondary winding of the transformer by, ~6 \- l# `5 g+ ?* k
applying a sinusoidal voltage having a frequency higher than rated frequency to the primary
+ x( I& o. d4 D# W% r% rterminals.' z: x+ Q- y7 ?( S) U
The duration of the test is
/ R7 b8 Z* `: U# M, t– 60 s, for frequencies up to twice the rated frequency, or5 l W. V( L: ?. I0 S4 S6 | F4 e9 l
– 120 × rated frequency / test frequency s, with a minimum of 15 s, for higher frequencies.4 [) F+ q4 p0 V) |, H4 @8 P
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要求对高压变压器进行两倍工作电压的耐压测试。 z! I0 {- F- Q
6 m; g1 u$ S# \, t; R4 x6 C那么测试电压就是16kV!!! 频率可以增高,以避免着火等危险。
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但能够提供16kV的耐压仪去哪里找?哪位做过此项试验?
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$ ~$ d! o& h; \9 L* e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?!. Z; X2 b' l; @( C3 C3 _0 i& B
/ k" s; h4 b% J* S* c( S/ w也可能我理解错误,欢迎指正。 |
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