140DAI45300 磁芯電流探頭可以測(cè)試直流電和交流電，并且測(cè)試直流電和高頻交流電信號(hào)的方法不同。霍爾傳感器用于測(cè)量直流和低頻交流電，而電流互感器用于測(cè)量高頻交流電。交流電在電流互感器的鐵芯中產(chǎn)生磁場(chǎng)，然后電流在第二個(gè)繞組電路中汲取并饋入示波器。如下所示：
交直流混合探頭的結(jié)構(gòu)圖如下：
在降額曲線中，只能在低于10K的頻率下測(cè)試15Arms的最大連續(xù)電流。
磁芯電流探頭降額功率的主要原因是，當(dāng)測(cè)量高頻和高振幅電流時(shí)，探針本身會(huì)發(fā)熱。這些熱量甚至可能導(dǎo)致探頭融化并損壞。自熱的主要原因有兩個(gè)：
1、高頻電流產(chǎn)生交變磁場(chǎng)。磁場(chǎng)在導(dǎo)體上感應(yīng)出渦流，頻率越高，渦電流越大，渦流會(huì)導(dǎo)致導(dǎo)體發(fā)熱和渦流損耗。
2、在測(cè)量高頻電流時(shí)，磁芯電流探頭使用變壓器方法進(jìn)行測(cè)量。隨著高頻信號(hào)在導(dǎo)體上產(chǎn)生趨膚效應(yīng)，導(dǎo)體的電阻增加，導(dǎo)體產(chǎn)生熱量，頻率越高，皮膚現(xiàn)象越明顯。
為了避免熱損壞核心流量探頭，在使用時(shí)應(yīng)考慮待測(cè)電流的頻率及其諧波分量及其幅度之間的關(guān)系。
專業(yè)致力于電力電子變換技術(shù)的研發(fā)和應(yīng)用,專業(yè)生產(chǎn)變頻電源、直流電源、交流負(fù)載、直流負(fù)載、回饋式電子負(fù)載、回饋式電網(wǎng)模擬器、電池模擬器、充電樁測(cè)試負(fù)載、光伏逆變器測(cè)試設(shè)備、新
能源電機(jī)電控測(cè)試電源及自動(dòng)化測(cè)試系統(tǒng)等產(chǎn)品制造及解決方案廠家，是國內(nèi)電源行業(yè)與測(cè)試系統(tǒng)核心技術(shù)自動(dòng)化的高新技術(shù)企業(yè)。
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