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| 摘要: |
| 传统发电机反时限过流保护认为发电机短时过负荷呈绝热特性 ,过负荷产生的额外热量全部用于定子绕组温升 ,不考虑其散热 ,因此在动作特性上比较保守 ,不能很好地反应热积累过程。在精确分析发电机过负荷热模型的基础上 ,根据定子绕组热平衡过程 ,充分考虑绕组的散热影响 ,提出了新型数字式反时限过流保护判据 ,克服了传统反时限过流保护的缺点 ,提高了保护性能 |
| 关键词: 数字式保护,反时限过流,发电机保护 |
| DOI： |
| 分类号:TM771 |
| 基金项目: |
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| Study of Digital Protection for Generator''''s Inverse-Time Overcurrent |
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ZHENG Hua
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| Abstract: |
| Conventional generator's inverse time overcurrent protection assumes that generator overload in short time is adiabatic and its extra quantity of heat is used for a rise in temperature of stator winding with lack considering the heat dissipation, so the trip time of conventional criterion is shorter. After analyzing the heat model with generator overloading precisely, a new criterion for generator's inverse time over current protection is presented based on winding's thermal balance process,it overcomes the shortage of convention criterion, improving the protection's performance. |
| Key words: digital protection,inverse-time overcurrent,generator protection |
