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風力變壓器防短路該做些什么

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風力變壓器防短路該做些什么

發布日期:2017-08-08 作者:江蘇鶴都電器有限公司 點擊:

輸變電網絡出現短路后,往往會導致變壓器繞組的故障。因此為了提高風力變壓器的抗突發短路能力,確保其可靠、安全地運行,特提出以下建議。
風力變壓器防短路該做些什么?
(1)改善電磁設計。改善電磁設計,通過加大主油道等手段提高產品的短路阻抗,使短路阻抗值盡可能接近最大上偏差,以此降低電網系統發生突發短路故障時的沖擊電流。低壓繞組采用銅箔繞制,從而提高繞組的機械強度,增強其抗突發短路能力。
(2)提高制造工藝。由于繞組并聯導線在揻制S彎時,容易遭受破損,出現尖角毛刺,所以換位處因絕緣破損而引發短路的概率較大。為確保導線換位處的彎折質量,S彎要用打彎的專用工具,切不可隨意彎折。改善傳統工具,采用液壓模板揻制S彎的新工藝,使得工作過程平穩、彎折導線平整無變形;折彎的弧度對應一致。否則在外力擠壓的作用下,換位導線容易發生移位,造成絕緣磕破短路。
(3)嚴控工序質量。增大電磁線進倉抽樣檢查的頻次,紙包電磁線的裸導體應光滑、無尖角和毛刺;絕緣層應完好無損。繞組繞制過程中要檢查電磁線是否平整、無彎曲。否則容易損傷股間絕緣或匝間絕緣,導致短路。繞組換位處不允許存在嚴重爬坡或剪刀口,否則在外部機械力或電磁力的作用下,會剪破導線的絕緣。
并繞導線的換位處須加強絕緣,絕緣紙槽應墊正、墊實;并且加包丹尼森紙,包扎應結實,不允許有懸浮紙帶。如果未進行必要的處理和補包,或者包扎不好,都有可能造成股間或匝間短路。導線對焊處,要銼光和磨平,不得有尖角、毛刺。否則繞制時會刺破與其接觸導線的絕緣,形成短路。

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