JP5275069B2 - 非接地系交流回路における直流・交流回路地絡検出方法 - Google Patents
非接地系交流回路における直流・交流回路地絡検出方法 Download PDFInfo
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- JP5275069B2 JP5275069B2 JP2009025074A JP2009025074A JP5275069B2 JP 5275069 B2 JP5275069 B2 JP 5275069B2 JP 2009025074 A JP2009025074 A JP 2009025074A JP 2009025074 A JP2009025074 A JP 2009025074A JP 5275069 B2 JP5275069 B2 JP 5275069B2
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- ground fault
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- 238000001514 detection method Methods 0.000 title claims description 34
- 230000008859 change Effects 0.000 claims abstract description 10
- 230000007935 neutral effect Effects 0.000 claims description 53
- 239000003990 capacitor Substances 0.000 claims description 33
- 230000000903 blocking effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 7
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- 238000009499 grossing Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 3
- 230000005347 demagnetization Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Description
[実施の形態1]
Rdg=Rng[(Vdc/2)−Vng]/Vng……(1)
[実施の形態2]
[実施の形態3]
[実施の形態4]
10 交流回路
20 三相整流器
30 直流回路
33 直流負荷
40 交流地絡センサ
41 交流地絡検出用零相変圧器
42 中性点接地線
43 零相変流器
51 中性点抵抗
52 中性点直流電位検出器
53 直流阻止用コンデンサ
54 切換スイッチ
55 直流検出用高抵抗
56 直流電位検出器
57 開閉スイッチ
61 交流地絡検出用零相電圧分圧器
Idg 直流地絡電流
Claims (1)
- 主変圧器二次側の非接地系交流回路に接続された直流回路の地絡事故を、前記交流回路側の交流地絡センサに配設した直流地絡電流制限用接地抵抗の直流電位変化で検出し、
前記接地抵抗は、前記交流回路に交流地絡センサとして配設した交流地絡検出用零相変圧器の一次側中性点接地線に介挿した中性点抵抗であり、
前記中性点抵抗に直列接続した直流阻止用コンデンサと、前記中性点抵抗と前記コンデンサの直列接続状態と前記中性点抵抗から前記コンデンサを切り離して直列接続状態を解除する切換スイッチを有し、
前記中性点抵抗の直流電位変化による前記直流回路の地絡事故検出信号に基づいて前記切換スイッチで前記中性点抵抗と前記コンデンサを直列接続状態に切り換えることを特徴とする非接地系交流回路における直流・交流回路地絡検出方法。
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JP2009025074A JP5275069B2 (ja) | 2009-02-05 | 2009-02-05 | 非接地系交流回路における直流・交流回路地絡検出方法 |
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JP2009025074A JP5275069B2 (ja) | 2009-02-05 | 2009-02-05 | 非接地系交流回路における直流・交流回路地絡検出方法 |
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JP2010183737A JP2010183737A (ja) | 2010-08-19 |
JP5275069B2 true JP5275069B2 (ja) | 2013-08-28 |
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JP2009025074A Active JP5275069B2 (ja) | 2009-02-05 | 2009-02-05 | 非接地系交流回路における直流・交流回路地絡検出方法 |
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Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9599651B2 (en) * | 2015-02-19 | 2017-03-21 | Nec Energy Solutions, Inc. | Systems and methods of detecting ground faults in energy storage and/or generation systems that employ DC/AC power conversion systems |
CN108051695B (zh) * | 2018-01-18 | 2024-02-27 | 广州优维电子科技有限公司 | 一种交直流接地故障分析仪和接地故障查找定位*** |
CN112886556B (zh) * | 2021-03-04 | 2022-12-16 | 中国南方电网有限责任公司 | 柔性直流输电交流连接线区单相接地故障控制保护方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5828810B2 (ja) * | 1976-11-24 | 1983-06-18 | 株式会社東芝 | 地絡検出装置 |
JPS61135329A (ja) * | 1984-12-05 | 1986-06-23 | 富士電機株式会社 | 界磁回路の地絡事故検出方式 |
JP2001231159A (ja) * | 2000-02-17 | 2001-08-24 | Hitachi Ltd | 低圧交流母線の地絡保護方法及び装置 |
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