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应用能源技术
2011年第3期(总第159期)
热电厂短路电流计算的心得体会
管蓉
(江苏省节能工程设计研究院,南京210007)
摘要:介绍了电厂设计中短路电流计算的基本步骤:包括基本参数的描述、电路元件标么值的计算、短路点短路电流的计算;并介绍了短路电流的计算方法:如基准值的选取、短路阻抗
标么值计算、等值阻抗图的筒化等。通过短路电流计算的基本步骤和计算方法的介绍使电气设计人员对纷繁复杂的短路电流计算有了清晰的思路和可靠的方法,解决了电气设计人员在短路电流计算时无从下手的困难。
关键词:短路电流计算;标么值;等值阻抗图;基准值
文章编号:1009-3230(2011)01-0024-05
中图分类号:TM732
文献标志码:B
TheExperienceof Short-circuitCurrentComputation
inthePowerPlant
GUANG Rong
(JiangsuEnergyConservationCenter,Nanjing210007,China)
Abstract: The article introduces the process of the short-circuit current computation in the power plant,the process includes the description of the basic parameters and the computation of the circuit components about per-unit value and the computation of the short-circuit current in the short dot. This article also indicates some methods about the short-circuit current computation, for example the selection of the base value and the computation in of the short current impendence about the per-unit value and the simplification of the equivalent impedance drawing and so on. By introducing the processes and the methods of the short-circuit current computation in order that the electrical engineering design draft person can have the clear thread and the dependable way when he faces the complicated computation in of the short-circuit current, simultaneously the article is helpful for the electrical engineering design draft person because it solves the intricacy dificulties about the short-circuit current computation in.
Key words: The short-circuit current computation; The per-unit value; The equivalent impedance drawing:Thebasic parameter
1
概述
某热电厂建设规模为:2台35T/H次高温次高
压普通链条炉配1台12MW抽凝式发电机组,现就电气设计过程中短路电流计算的方法和心得体会与大家分享一下,以便共同探讨从而共同进步。
电力系统的基本参数描述如下:(1)发电机参数
修订日期:2011-0211
收稿日期:201101-08
作者第介:管著(1971-),女,主要从事小型火电厂工业余
热发电及供热锅炉房电气设计。
万方数据
发电机型号:QF-12-2/10.5 发电机容量:12MW
发电机出口电压:10.5kV 发电机额定电流:776A 发电机功率因数:0.85
发电机纵轴次暂态电抗:11.59%(2)主变参数
主变型号:SZ1016000/35
主变额定电压:35±2x2.5%/10.5kV