描述
變頻調(diào)速設(shè)備對電能質(zhì)量的影響
在工業(yè)生產(chǎn)中,風(fēng)機(jī)、泵類負(fù)載等設(shè)備應(yīng)用范圍廣泛,其電能消耗和諸如閥門、擋板相關(guān)設(shè)備的節(jié)流損失以及維護(hù)、維修費用占生產(chǎn)成本的20%左右。變頻調(diào)速技術(shù)正是順應(yīng)了工業(yè)生產(chǎn)現(xiàn)代發(fā)展的要求,在多個行業(yè)的電機(jī)傳動設(shè)備中得到實際應(yīng)用,卓越的調(diào)速性能,顯著的節(jié)能效果,提高設(shè)備利用率,從而降低電機(jī)功耗達(dá)到系統(tǒng)高效運行的目的。變頻器的應(yīng)用雖然產(chǎn)生了顯著的節(jié)能效益,但隨之而來的諧波問題不容忽視。諧波電流注入電網(wǎng),不僅增加線路損耗,縮短輸電線壽命;增加旋轉(zhuǎn)電機(jī)電動機(jī)的損耗、增大電動機(jī)噪聲、產(chǎn)生脈動轉(zhuǎn)矩;導(dǎo)致電容器因過流而損壞。因而,在投入變頻器設(shè)備之前,應(yīng)該了解在哪些情況下應(yīng)該使用變頻器,哪些場合不適宜使用變頻器,以及綜合考慮變頻器的配置總量,變頻器過多配置帶來的諧波危害已成為共識。并聯(lián)電容補(bǔ)償對電能質(zhì)量的影響
通過并聯(lián)電容組進(jìn)行就地?zé)o功補(bǔ)償,是目前電網(wǎng)無功補(bǔ)償?shù)闹饕问?。同時系統(tǒng)存在分布電容,它們與系統(tǒng)的感性部分組合,在一定的頻率下可能存在串聯(lián)或并聯(lián)諧振的條件。當(dāng)系統(tǒng)中該次頻率的諧波足夠大時,就可能造成危險的過電壓或過電流。應(yīng)當(dāng)指出,諧波諧振成為危害,必須具備兩個條件,其一是電網(wǎng)參數(shù)的不利配合,其二是有足夠的諧波源。過去諧波諧振問題不突出的主要原因是電網(wǎng)中的諧波源比較少。隨著電網(wǎng)中諧波源的大量增加,諧振問題就越來越引人注目了。而解決此問題,一方面要控制諧波源,另一方面要設(shè)法消除系統(tǒng)參數(shù)的不利配合。
產(chǎn)品承諾:
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢價格,大量現(xiàn)貨。
主營DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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