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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。
335-2-65中cl. 16.101规定:
16.101 High-voltage transformers shall have adequate internal insulation.
Compliance is checked by the following test.
Twice the working voltage is induced in the secondary winding of the transformer by
applying a sinusoidal voltage having a frequency higher than rated frequency to the primary
terminals.
The duration of the test is
– 60 s, for frequencies up to twice the rated frequency, or
– 120 × rated frequency / test frequency s, with a minimum of 15 s, for higher frequencies.
要求对高压变压器进行两倍工作电压的耐压测试。
那么测试电压就是16kV!!! 频率可以增高,以避免着火等危险。
但能够提供16kV的耐压仪去哪里找?哪位做过此项试验?
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?!
也可能我理解错误,欢迎指正。 |
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