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High-frequency transformer failure analysis and design training materials

  • 2013-09-22
  • 420.87KB
  • Points it Requires : 2

(1).測感值与Q值,應盡可能采用幵關電源主頻率,Q值可反映批次鐵芯質量,繞線工藝.(2).DCR值和線經与變壓溫升關系极大.變壓器漏感与繞線工藝有關,与設計的初級次級層數有關三明治線法漏感小,但可能溫升高點(3).隱含性層間与匝間Short,可采用脈衝振鈴波進行比較測試.(4).鐵芯有無斷裂与鐵芯磁特性可進行Load test 即加DC電流測電感.此不良一般不能用測感值Q值測出,也雞以用其它方式測出.變壓器一次側与二次側之間的接地銅片主要用來作靜電屏蔽,清除二次側分布電容效應.變壓器外部所包一圈短路銅片,是利用其渦流与環流減少高頻漏泄磁場影響,,最好接地,也可利用封閉式鐵芯体磁芯達到以上目的.

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