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| 摘要: |
| 对广东某电厂发电机的100％定子接地保护改造情况进行了讨论分析，要改造的发电机是进口的，且容量大，运行时三次谐波电压很小，原改造方案中保护装置采用美国生产的SEL－300G，但它的三次谐波电压整定值范围小并且只有1个电压调整系统。在发电机小负荷时SEL－300G没有保护功能，无法实现真正的100％定子接地保护，不能满足保护规程的要求，国电南京自动化股份有限公司生产的WFBZ－01装置的三次谐波电压整定值范围大并且有3个电压调整系数，经现场测试该装置满足保护要求。 |
| 关键词: 大容量发电机 定子 接地保护 技术改造 |
| DOI： |
| 分类号:TM31 |
| 基金项目: |
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| Analysis on reconstruction of stator grounding protection for large capacity generator |
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LE Xiu-fan ZHANG Fang-jun
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| Abstract: |
| The reconstruction of100%stator grounding protection for the generator of a power plant is discussed.The large capacity generator reconstructed is imported and its3rd harmonic voltage is low.The original scheme adopted US's SEL-300G protective relay and it has narrow voltage setting range and only one adjustable coefficient .Under low load conditions,SEL-300G could not meet the requirements of protection regulations to realize100%stator grounding protection.WFBZ-01protection produced by NAEF has broad voltage setting range and three adjustable coefficients.Site test shows that the later fully meets the demands of protection. |
| Key words: relay,generator,stator grounding, |
