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| 摘要: |
| 针对在电力工程中为节省投资而采用低压 (△侧 )套管内有气隙电流互感器的情况 ,论述了单相变压器差动保护原理 ,介绍了三相变压器差动保护的 3种接线方法。分析结果表明 ,变压器△侧相绕组差动保护的TA接线 ,无论其是否为套管TA ,对匝间故障保护效果都无差异。但对相间短路故障 ,三相式变压器 △ 侧绕组差动保护接套管TA时 ,接法不同 ,保护效果则不同。 |
| 关键词: 变压器保护,变压器套管,故障分析 |
| DOI： |
| 分类号:TM77 |
| 基金项目: |
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| Analysis on Transformer Differential Protection with Bushing Current Transformer at Delta Side |
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LIU Huan zhang
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| Abstract: |
| The principle of single phase transformer differential protection is presented, which is applied in the case of connecting bushing current transformer with air gap at lower voltage side (delta side) for cutting down the cost in electric engineering. Three different connection modes of 3 phase transformer differential protection are introduced. For the TA connections of the differential protection for transformer delta side phase winding, the analysis result shows that, there is no difference in the effectiveness for inter turn fault protection, whether it is a bushing TA or not. But for inter phase short circuit fault, the different TA connection modes have different protection effectiveness when the bushing TA is connected to the differential protection relay at delta side winding of 3 phase transformer. |
| Key words: transformer protection,transformer bushing,fault analysis, |
