|
| 摘要: |
| 针对110KV变电站站用变压器保护TA变比选择过小，在站用变压器故障时，短路电流使TA严重饱和，会造成站用变压器保护装置拒动的问题，通过对TA等值电路的分析，并结合工程中实际使用的TA、所接保护装置及最大短路电流，计算得出110KV变电站为保证站用变压器故障时TA不饱和，在10KV站用变压器高压侧三相短路时保护用的TA变比要大于600/5，低压侧三相短路时保护用TA变比要大于200/5。并提出110KV变电站站用变保护用TA变比最好大于600/5的建议。 |
| 关键词: 防饱和角度分析 站用变压器 保护 电流互感器 继电保护装置 变电站 |
| DOI： |
| 分类号:TM452 TM774 |
| 基金项目: |
|
| Selection and verification of substation transformer protection TA from the pinot of saturation prevention |
|
CHEN Yi kai
|
| Abstract: |
| As the transformer TA ratio of 110 kV substation is not big enough, it may become severely saturated by the short circuit current when the substation transformer breaks down. It may cause the operation failure of protective gear. Combined with the practical engineering applications of TA and based on the analysis and calculation of TA's equivalent circuit, the suggestions are proposed that: in order to avoid TA saturation,the ratio of the TA used for the 3-phase SC protection at the HV side of 10 kV substation transformer should be greater than 600/5, that at LV side greater than 200/5 and that used for 110 kV substation transformer greater than 600/5. |
| Key words: saturation,substation transformer,relay protection,TA,selection |
