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| 摘要: |
| 针对大型抽水蓄能电站10/0.4 kV厂用变压器远离配电装置的特点,提出了利用变压器高压侧过流保护兼做低压侧单相接地故障时的保护.根据抽水蓄能电站厂用电接线和D,Yn11变压器的特点,建立一个单电源电力系统模型,假定变压器低压侧a相发生接地故障,利用对称分量法求得高压侧各相的短路电流表达式.根据实际工程中应用的变压器容量以及变压器与配电装置的距离,对变压器高压侧过流保护的灵敏度进行计算,灵敏度系数大于1.5,满足规范DL/T5177-2003的要求.最后根据计算结果,对距离配电装置4 km以内的2000 kV·A及以下变压器低压侧单相接地故障的保护配置作出了建议. |
| 关键词: 变压器 过流保护 单相接地故障 对称分量法 保护灵敏度 |
| DOI： |
| 分类号:TV743;TM862 |
| 基金项目: |
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| LV-side single-phase grounding protection configuration for 10/0.4kV station transformer of large pumped storage power plant |
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HUANG Rui
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| Abstract: |
| As the 10 / 0.4 kV station transformer of large pumped storage power plant is far from its switchgear,it is suggested to use its overcurrent protection at high -voltage side at the same time as its single - phase grounding protection at low - voltage side. A single source electrical power system model is presented based on the features of the station power connections and D,Yn11 transformer. The short circuit current expressions of three phases at HV side for the single - phase grounding fault of phase A at... |
| Key words: transformer overcurrent protection single-phase grounding fault symmetrical component method protection sensibility |
