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首页> 外文期刊>Electric power systems research >Experimental analysis of assessing of the tripping effectiveness of miniature circuit breakers in an electrical installation fed from a synchronous generator set
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Experimental analysis of assessing of the tripping effectiveness of miniature circuit breakers in an electrical installation fed from a synchronous generator set

机译：评估同步发电机组供电的电气装置中的微型断路器跳闸有效性的实验分析

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Due to the supply reliability concerns or to supply remote loads in some distribution networks, the synchronous generators are used as auxiliary power sources. In Poland the generators are usually connected to the network of TN (earthed neutral point) structures. Both TN-C and TN-S or their mixed arrangements TN-C-S are used. Overcurrent protection in these circuits, according to Polish and international standards and the recommendation of SEP (Association of Polish Electrical Engineers), should also act as anti-shock protection. The protection is considered to be effective (for 400V electrical installations) if the overcurrent protection trip takes less than 0.4 s (maximum allowable time of touching voltage occurrence). The investigation performed by authors, showed that the producers of the generators usually use B or C characteristic circuit breakers and for large generator sets (greater than 100 kVA) they recommend load split to the value of one fifth of the generator maximum power. Additionally, the most frequently excitation forcing equipment is mounted to keep short circuit current three times greater than nominal current of the generator. To assess the effectiveness of the anti-shock protection measures in circuits fed from auxiliary generator and for current lower than 32 A, the set up including a self-exiting 5.5 kVA and 400 V generator, overcurrent protection and load was built in laboratory. The set up uses miniature circuit breakers and enables short circuits in different instants, compared to the initial phase angle of the generator voltage.
机译：由于供电可靠性的考虑或在某些配电网络中要供电给远程负载，同步发电机被用作辅助电源。在波兰，发电机通常连接到TN（接地中性点）结构的网络。 TN-C和TN-S或它们的混合布置TN-C-S均被使用。根据波兰和国际标准以及SEP（波兰电气工程师协会）的建议，这些电路中的过电流保护也应起到防震保护的作用。如果过电流保护跳闸的时间少于0.4 s（发生接触电压的最大允许时间），则认为该保护措施是有效的（对于400V电气安装）。作者进行的调查显示，发电机的生产者通常使用B或C特性断路器，对于大型发电机组（大于100 kVA），他们建议将负载分配为发电机最大功率的五分之一。此外，安装了最频繁的励磁强制设备以使短路电流保持为发电机标称电流的三倍。为了评估在辅助发电机馈电的电路中以及在电流低于32 A的情况下的抗冲击保护措施的有效性，在实验室中建立了包括自退出5.5 kVA和400 V发电机，过电流保护和负载的设置。与发电机电压的初始相位角相比，该装置使用了微型断路器，并允许在不同的瞬间短路。

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