10 kV配电变压器保护配置方式的合理选择
2012-06-04路利军
路利军
摘 要:10 kV配电变压器的保护配置主要有断路器、负荷开关或负荷开关加熔断器等。负荷开关投资省,但不能开断短路电流,很少采用;断路器技术性能好,但设备投资较高,使用复杂,广泛应用不现实;负荷开关加熔断器组合的保护配置方式,既可避免采用操作复杂、价格昂贵的断路器,弥补负荷开关不能开断短路电流的缺点,又可满足实际运行的需要,该配置可作为配电变压器的保护方式,值得大力推广,为此,对10 kV环网供电单元和终端用户10 kV配电变压器采用断路器、负荷开关加熔断器组合的保护配置方式进行技术-经济比较,供配电网的设计和运行管理部门参考。 关键词:10 kV配电变压器;断路器;负荷开关;熔断器;保护配置
Abstract: protection of 10 kV distribution transformers to configure the main circuit breaker, load switch or load switch plus fuse. Load switch investment, but not breaking the short circuit current, is rarely used; breaker technical performance, but higher investment in equipment, the use of complex, widely used unrealistic; the configuration of the protection of the load switch and fuse combination, can prevent the complex and expensive circuit breakers to make up for the shortcomings of the load switch can not short-circuit current breaking, but also to meet the needs of the actual operation, this configuration can be used as the protection of distribution transformers, worth promoting, for the 10 kV power supply unit and end-user of the ring 10 kV distribution transformer with circuit breaker, load switch plus fuse protection configuration of the combination of technical - economic comparison for distribution network design and operation management departments for reference.
Key words: 10 kV distribution transformers; circuit breakers; load switch; fuse; protection configuration
中图分类号:TM421 文献标识码:A文章编号:2095-2104(2012)05-0020-02
无论是在环网供电单元、箱式变电站或是终端用户的高压室结线方式中, 如配电变压器发生短路故障时,保护配置能快速可靠地切除故障,对保护10 kV高压开关设备和变压器都非常重要。保护方式的配置一般有两种:一种利用断路器;另一种则利用负荷开关加高遮断容量的后备式限流熔断器组合。这两种配置方式在技术和经济上各有优缺点,以下对这两种方式进行综合比较分析。オ
1环网供电单元接线形式1.1环网供电单元的组成 环网供电单元(RMU)由间隔组成, 一般至少有3个间隔,包括2个环缆进出间隔和1个变压器回路间隔, 环缆馈线与变压器馈线间隔均采用负荷开关, 通常为具有接通、隔断和接地功能的三工位负荷开关。……
