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Analysis on reconstruction of stator grounding protection for large capacity generator
Author(s): 
Pages: 20-23
Year: Issue:  12
Journal: ELECTRIC POWER AUTOMATION EQUIPMENT

Keyword:  继电器发电机定子接地;
Abstract: 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个电压调整系数,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.
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