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For a 220kV substation with 35kV capacitive voltage transformer secondary voltage abnormal drop fault, this paper introduces the structure of capacitive voltage transformer and its working principle. Then, combined with fault phenomenon, diagnostic test data, equipment disintegration inspection, the cause of the fault as ferromagnetic resonance overvoltage causing insulation breakdown of the differential and angular coils is analyzed and determined. Finally, some suggestions are put forward for the infrared temperature measurement and secondary voltage monitoring in the daily operation and maintenance inspection to improve the reliability of capacitive voltage transformer operation.
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针对某220kV变电站内一起35kV电容式电压互感器二次电压异常下降故障,本文首先介绍电容式电压互感器的结构和工作原理;然后结合故障现象、诊断试验数据、设备解体检查情况,综合分析并判断故障原因为铁磁谐振过电压将比差、角差线圈绝缘击穿;最后针对日常运维巡视中的红外测温和二次电压监视提出相应的建议,以提高电容式电压互感器运行可靠性。
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李冬雪(1993—),男,河北保定人,工程师,从事电力系统一次设备检修与高压试验方面的工作。
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李冬雪(1993—),男,河北保定人,工程师,从事电力系统一次设备检修与高压试验方面的工作。
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李冬雪(1993—),男,河北保定人,工程师,从事电力系统一次设备检修与高压试验方面的工作。
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CVT电气原理 A—高压端子 C1—高压电容 C2—中压电容 T—中间变压器 L—补偿电抗器 F—保护间隙 Z—阻尼器 R—保护电阻 1a1n—二次绕组接线端 2a2n—二次绕组接线端 3a3n—二次绕组接线端 dadn—剩余绕组接线端 N—电容分压器低压端 P1P2—保护间隙接线端 E—接地端
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| 绕组 | 1a1n | 2a2n | 3a3n | dadn |
直流 电阻/Ω | 试验值 | 0.057 6 | 0.063 6 | 0.075 2 | 0.061 6 |
| 出厂值 | 0.055 9 | 0.061 5 | 0.073 7 | 0.061 1 |
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二次绕组直流电阻测量结果
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| 绕组 | 1a1n | 2a2n | 3a3n | dadn |
直流 电阻/Ω | 试验值 | 0.057 6 | 0.063 6 | 0.075 2 | 0.061 6 |
| 出厂值 | 0.055 9 | 0.061 5 | 0.073 7 | 0.061 1 |
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电容器高压 A对地 | 电容器末屏 N对地 | 电磁单元 末端P2对地 | 二次绕组对 一次及地 |
| 5.58 | 4.29 | 0 | 1.18 |
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绝缘电阻测量结果 单位:GΩ
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电容器高压 A对地 | 电容器末屏 N对地 | 电磁单元 末端P2对地 | 二次绕组对 一次及地 |
| 5.58 | 4.29 | 0 | 1.18 |
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| 绕组 | 测量电压/kV | 电压比 | 相位/(°) |
| 1a1n | 10 | 3 905 | 262.828 |
| 2a2n | 10 | 3 915 | 262.538 |
| 3a3n | 10 | 3 929 | 262.447 |
| dadn | 10 | 6 672 | 262.371 |
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电压比测量结果
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| 绕组 | 测量电压/kV | 电压比 | 相位/(°) |
| 1a1n | 10 | 3 905 | 262.828 |
| 2a2n | 10 | 3 915 | 262.538 |
| 3a3n | 10 | 3 929 | 262.447 |
| dadn | 10 | 6 672 | 262.371 |
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| 项目 | 高压电容C1 | 中压电容C2 | 整体电容C |
| 电容量/nF | 试验值 | 40.64 | 40.59 | 20.44 |
| 出厂值 | 39.96 | 39.98 | 19.93 |
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电容量测试结果
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| 项目 | 高压电容C1 | 中压电容C2 | 整体电容C |
| 电容量/nF | 试验值 | 40.64 | 40.59 | 20.44 |
| 出厂值 | 39.96 | 39.98 | 19.93 |
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氢气(H2) 体积分数 | 甲烷(CH4) 体积分数 | 乙烯(C2H4) 体积分数 | 乙烷(C2H6) 体积分数 | 乙炔(C2H2) 体积分数 | 一氧化碳(CO) 体积分数 | 二氧化碳(CO2) 体积分数 |
| 13 473.20 | 1 201.42 | 2 350.67 | 3 854.35 | 2 924.80 | 20 466.00 | 157 072.00 |
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油色谱试验结果 单位:μL/L
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氢气(H2) 体积分数 | 甲烷(CH4) 体积分数 | 乙烯(C2H4) 体积分数 | 乙烷(C2H6) 体积分数 | 乙炔(C2H2) 体积分数 | 一氧化碳(CO) 体积分数 | 二氧化碳(CO2) 体积分数 |
| 13 473.20 | 1 201.42 | 2 350.67 | 3 854.35 | 2 924.80 | 20 466.00 | 157 072.00 |
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