三机组对双电源快速切换的影响

使用ETAP仿真软件对含有三机组的6 kV变电站,发生进线断路器误跳故障和进线三相短路故障时的双电源快速切换过程进行分析。仿真结果表明,进线断路器误跳故障时的工作母线残压可能上升超过系统正常电压,相角差超过典型整定值20°。进线三相短路故障时的工作母线电压下降得很低以至于不满足快速切换判据,切换时间太长。因此,在快速切换判据中增加工作母线电压上限约束为1.1倍额定电压,相角差可以整定为23°~30°。在进线三相短路故障时增加残压切换判据检验,并采用同时切换方式,缩短了切换时间。...

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Bibliographic Details
Published in电力系统保护与控制 Vol. 42; no. 16; pp. 33 - 39
Main Author 梁志珊 夏鹏程 卜繁多
Format Journal Article
LanguageChinese
Published 中国石油大学 北京 自动化系,北京,102249 2014
Subjects
三机组
参数整定
快切装置
改进判据
母线残压
三机组
parameters setting
3-component flue gas expender train
改进判据
improved criterion
母线残压
参数整定
快切装置
high speed transfer device
busbar residual voltage
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ISSN1674-3415

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Summary:使用ETAP仿真软件对含有三机组的6 kV变电站,发生进线断路器误跳故障和进线三相短路故障时的双电源快速切换过程进行分析。仿真结果表明,进线断路器误跳故障时的工作母线残压可能上升超过系统正常电压,相角差超过典型整定值20°。进线三相短路故障时的工作母线电压下降得很低以至于不满足快速切换判据,切换时间太长。因此,在快速切换判据中增加工作母线电压上限约束为1.1倍额定电压,相角差可以整定为23°~30°。在进线三相短路故障时增加残压切换判据检验,并采用同时切换方式,缩短了切换时间。
Bibliography:Fast transfer processes of double power supplies are analyzed by help of ETAP simulation software, when incoming line circuit breaker false tripping fault and incoming line three-phase short-circuit fault happen in a 6 kV substation containing 3-component flue gas expender train. The simulation results show that, the residual voltage of operating bus likely rises more than normal system voltage in the incoming line circuit breaker false tripping fault event, and the phase angle difference is more than the typical 20 degrees. The operating bus voltage drops in the incoming line three-phase short-circuit fault event and is too low to meet the fast transfer criteria, and the transfer time is too long. Thus the operating bus voltage upper limit of 1.1 times rated voltage is added, and the setting values of the phase angle difference is properly 23-30 degrees. The residual pressure switch criterion inspection is added in the incoming line three-phase short-circuit fault, and works under simultaneous switching mode
ISSN:1674-3415