FX3SA-10MT-CM

FX3SA-10MT-CM

電網(wǎng)電壓經(jīng)主變壓器隔離移相后為每個(gè)功率單元供電，每個(gè)功率單元為一個(gè)單相交-直-交電壓型逆變器，單元串聯(lián)星接后形成三相變頻電源給高壓電動(dòng)機(jī)供電。根據(jù)串聯(lián)單元級數(shù)的不同，產(chǎn)品分為3kV、6kV、10kV三個(gè)系列。變頻器輸出采用多重化PWM技術(shù)，輸出為近乎的正弦波，無須加輸出濾波器。變頻運(yùn)行后電動(dòng)機(jī)諧波損耗小，轉(zhuǎn)矩脈動(dòng)小，無明顯電動(dòng)機(jī)噪聲。電動(dòng)機(jī)不需降額使用。輸出dV/dt和共模電壓小，對電動(dòng)機(jī)無附加電應(yīng)力損害。

隔離變壓器為三相干式整流變壓器，采用強(qiáng)迫風(fēng)冷降溫，有使用壽命長、免維護(hù)等優(yōu)點(diǎn)。移相變壓器原邊輸入為3KV,6KV,10KV 的Y接形式;副邊繞組數(shù)量根據(jù)變頻器電壓等級確定。6kV系列為18個(gè)副邊繞組，為延邊三角形接法，為每個(gè)功率單元提供三相690V電源輸入。

移相變壓器的移相繞組大限度的抑制輸入側(cè)諧波含量，同一相的副邊繞組通過延邊三角形接法移相，繞組間的相位差由下式計(jì)算：

移相角度= 60°/每相單元數(shù)量

因?yàn)闉楣β蕟卧峁╇娫吹淖儔浩鞲边吚@組間有的相位差，所以從而了大部分由單個(gè)功率單元所引起的諧波電流，滿足IEEE519-1992和GB/T 14549-93對電壓和電流嚴(yán)格的諧波失真要求。無需任何功因數(shù)補(bǔ)償和諧波抑制裝置。并且能保持接近1的輸入功率因數(shù)。

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