KL9190

變壓器容量S＝P/0.9（變頻器效率）/0.95（變頻器功率因數）/0.90（電壓波動系數），這里P=900kw， 你可以選擇變壓器容量為S=1169.5KVA， 所以你可以選擇1200KVA的變壓器，因為這個電壓比較特殊，如定做要跟對方說明負載是變頻器，該變壓器設計應該按整流變壓器設計。

　　變頻調速電動機需要經過變頻器進行調速，而變頻器輸出的電壓和頻率都需要通過變壓器進行調整和適配，使其適合電機的額定電壓和頻率。因此，變頻調速電動機的變壓器選擇需要根據以下幾點進行考慮：

　　1. 額定功率：變壓器的額定功率應該大于變頻器輸出電壓和電流所對應的電機功率。

　　2. 額定電壓比：使用變頻調速系統(tǒng)，變壓器的額定電壓比應該考慮到變頻器輸出電壓波形的畸變，一般建議選擇1:1.5或者1:2的額定電壓比。

　　3. 繞組材料：變壓器的繞組材料應該選擇絕緣性能好、耐高溫、低損耗的電磁線，以確保變頻調速電動機的和可靠性。

　　4. 冷卻方式：根據使用環(huán)境和功率大小等條件選擇適合的冷卻方式，比如自然風冷、強迫風冷或者水冷等。

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