Abstract
According to the distribution network line structure and reclosing control strategy, the system simulation model of distribution network lines has established based on the real-time digital simulation RTDS. Based on this, distribution network switching impulse current characteristic has researched with different capacity, different distribution and different load power factor under the different voltage switching angles. The results of the study provide a scientific basis for distribution network line protection setting, in order to further lay the foundation for improvement the validity and reliability of distribution network line protection action.
Highlights
With the continuous random access of residential load and commercial unit into distribution network, the load current of distribution network increases constantly
Post- acceleration protection setting of distribution network was studied deeply and comprehensively in literatures [3,4,5], only the determination of postacceleration protection set point is studied from the single aspect of setting calculation, but the calculation did not involve the distribution situation of distribution transformer capacity of distribution line, as well as the parameters and load character of distribution line
10kV system distribution line is taken as research object, a distribution line real-time simulation platform based on RTDS is established, and on this bases, the characteristics of closing impact current of distribution line under different distribution of distribution transformer capacity, different load power factor of low voltage side of the distribution transformer and different voltage a Corresponding author : 249245208@qq.com closing angle is studied, and the main factors which influence the characteristics of closing impact current is sorted out
Summary
With the continuous random access of residential load and commercial unit into distribution network, the load current of distribution network increases constantly. Grid-connected operation of new distribution transformers which come into service recently has to some extent changed the system structure and power flow distribution. The reclosing impact current of distribution network line will change, and the amplitude and fall time of impact current will change to a certain extent[1,2]. Post- acceleration protection setting of distribution network was studied deeply and comprehensively in literatures [3,4,5], only the determination of postacceleration protection set point is studied from the single aspect of setting calculation, but the calculation did not involve the distribution situation of distribution transformer capacity of distribution line, as well as the parameters and load character of distribution line. The accuracy level of post-acceleration protection set point of setting is poor, which lead to the reduction of the success rate of reclosing of distribution line. Closing angle is studied, and the main factors which influence the characteristics of closing impact current is sorted out
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