本文選題：變壓器鐵芯飽和 + 勵磁涌流�。� 參考：《電力系統(tǒng)自動化》2016年24期

【摘要】：建立了變壓器鐵芯飽和的統(tǒng)一模型,推導(dǎo)出磁鏈最大值與電壓突變時刻、突變前后電壓相角差及突變后電壓幅值的關(guān)系式,鐵芯是否飽和與這些參數(shù)密切相關(guān)。發(fā)現(xiàn)電壓降低(如系統(tǒng)發(fā)生故障或者非同期合閘操作)情況下也會產(chǎn)生鐵芯飽和,因而以電壓幅值降低作為變壓器不會產(chǎn)生勵磁涌流的依據(jù)并不可靠。進而提出一種基于電壓量積分的鐵芯飽和判別方法,該方法對空載合閘、故障切除、和應(yīng)涌流、系統(tǒng)故障或操作等電壓突變引起變壓器鐵芯飽和而產(chǎn)生勵磁涌流,都能在半個周期左右的時間完成判別,為差動保護不經(jīng)涌流閉鎖提供了一種有效、快速的實現(xiàn)方法,可顯著提高運行變壓器發(fā)生內(nèi)部故障時差動保護的動作速度。
[Abstract]:A unified model of transformer core saturation is established. The relationship between the maximum flux value and the voltage abrupt time, the voltage phase angle difference before and after the abrupt change, and the voltage amplitude after the sudden change are derived, and whether the core is saturated or not is closely related to these parameters. It is found that if the voltage is reduced (such as the fault of the system or the closing operation at the same time), the core saturation will also occur, so it is not reliable to use the voltage amplitude reduction as the basis for the transformer not to produce the inrush current. Furthermore, a method based on voltage integration is proposed to distinguish the saturation of iron core. The method can cause the transformer core saturation and cause inrush current caused by the voltage abrupt changes such as no-load closing, fault removal, inrush current, system fault or operation. All of them can be judged in about half a period of time, which provides an effective and fast method for differential protection without inrush current locking, and can significantly improve the operation speed of differential protection in the event of internal failure of transformer.
【作者單位】： 南瑞集團公司(國網(wǎng)電力科學(xué)研究院);智能電網(wǎng)保護和運行控制國家重點實驗室;國電南瑞科技股份有限公司;
【分類號】：TM41

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