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當前位置:首頁 » 博揚智能資訊中心 » 變換器/變壓器 » 變壓器KVA和KW額定值代表什么含義,額定功率是否一樣?

變壓器KVA和KW額定值代表什么含義,額定功率是否一樣?

發表時間:2021-10-28 17:54【 閱讀量:-查看手機網址
掃一掃!變壓器KVA和KW額定值代表什么含義,額定功率是否一樣?掃一掃!

    電氣變壓器的額定值以VA(伏安培)為單位,因為:

    變壓器的最大載流能力由導體的厚度決定,提供給繞組的最大電壓取決于導體的絕緣強度

    變壓器和交流發電機的制造商不知道消費者使用機器的功率因數以及連接到機器的負載的性質(電容性、電阻性和電感性)。因此,他們根據最大載流電流和要施加的電壓對變壓器進行評級。變壓器的該額定值對應于機器的視在功率(VA)。此外,變壓器中的鐵損取決于施加的電壓,而銅損取決于流過繞組的電流。這些損耗與變壓器運行時的功率因數無關。

    另一方面,感應電機的額定功率為實際功率(瓦),因為機器在滿載時以定義的功率因數運行是預先確定的。

    例如:考慮一個變壓器可以承載的最大電流為50A,施加的最大電壓為200V。然后

    滿載時的額定功率(單位功率因數)=50x200=10kW

    滿載時的額定功率(0.5功率因數)=50x200x0.5=5kW(這意味著0.5功率因數的負載最多可以連接5kW到變壓器。5kW是變壓器的滿載)

重生九零小辣椒
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