Research And Development Of The Configuration Scheme And Setting System Of Enterprise Power Grid Relay Protection

In the face of the global epidemic disaster,China’s economy has not stagnated,but still maintained rapid development.All industries are thriving.The basis of enterprise production and development is the safe and stable operation of the power system,so it is increasingly critical to guarantee the reliability of power supply for enterprises.And relay protection is to avoid power system accidents or expansion of one of the important lines of defense,one of the most critical is to ensure the accuracy of fixed value,only the relay protection fixed value is correct,the relay protection device can correct action,and reduce the possibility of the device mismotion.As the relay protection setting work is more complex,the process is cumbersome and various factors need to be considered at the same time,so that with the continuous expansion of the scale of the power grid,the relay protection setting management and data maintenance work is becoming more and more difficult.This thesis first analyzes the electrical quantities when a fault occurs in the power grid of 35 k V and below enterprises,and combines the actual power grid grounding method of a certain enterprise to study its phase-to-phase,indirect,and single-phase grounding fault protection,and gives corresponding protection schemes.Secondly,a brief introduction to the company’s power supply relationship and the corresponding operation mode will lay the foundation for the subsequent relay protection setting work.After sorting out the local existing protection devices and setting conditions in detail,a suitable protection setting plan is given around the terminal electrical equipment,the busbar section switch,the incoming line on the receiving side and the outgoing line on the transmitting side.Finally,in view of the other setting software on the market the problems,such as not on a fixed value,the time at the same time cooperate and protection configuration is not comprehensive,in this thesis,the relay protection setting value setting system for research and development,its mainly includes the graphical modeling,fault calculation,the function such as setting calculation,and the corresponding module and operation steps in detail.In order to meet the requirements of grid relay protection of different enterprises,the principle of layered maintenance and protection is put forward.The core of the principle is that when the equipment is expanded or added to be protected,it only needs to be directly called from the software to eliminate the cumbersome configuration of protection principle.Compared with other set-value and setting software,the maintenance efficiency has been greatly improved.