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        低壓電路之電器保護(hù)

        2019/8/17 9:00:44      點(diǎn)擊:

        我國每年的發(fā)電量在總數(shù)上來看并不算少,但對應(yīng)的,每年的用電量也是一個(gè)十分巨大的數(shù)字;

          而且跟著居民們的生活水平不斷提高,家用電器也越來越多,用電量還會不斷持續(xù)的增加。

          理論上,在一根線路中,假如負(fù)載過大的話,電壓就會受到影響;

          一般會比額定電壓低,當(dāng)電壓降低到額定電壓的70%,這時(shí)候叫做潰散電壓,將使電動(dòng)機(jī)無法起動(dòng),照明用具暗淡無光,電阻爐發(fā)熱缺少。

          當(dāng)電壓降低至50%左右,這時(shí)候叫做臨界電壓,負(fù)載電動(dòng)機(jī)將停轉(zhuǎn);

          隨即電動(dòng)機(jī)的電流急劇上漲,假如這種一場情況持續(xù)一段時(shí)間,電動(dòng)機(jī)很有或許會被焚毀。

          為了避免上述情況的發(fā)作,就要采用一些有效的手法進(jìn)行遏制。

          一般會在斷路器上裝設(shè)欠電壓脫扣器,它的電壓會額定在正常電壓的70%—35%之間;

          一旦電路中的電壓存在反常,則會發(fā)作效果,避免電機(jī)由于短時(shí)間的電流過大而焚毀。

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