Development And Application Of Relay Protection Setting Calculation Software

Relay protection device is the important equipment to guarantee the security of power network operation, and also a important link of security assurance system in power network. To guarantee the rwliability, sensitivity, selectivity and speed of the relay protection device, need to calculate the protection setting value rapidly and accurately. This paper reference the development experience of relay protection setting calculation software from at home and abroad. And on the basis of combine with the electricity department's actual operating experience, we developed a set of graphical relay protection setting calculation software that can use in the fault analysis and relay protection setting calculation of power system.The relay protection setting calculation software is developed by using Microsoft Visual C#.NET language development tool and Access database tool.In this paper the integral function is divided into graphical modeling module, fault calculation module, setting calculation module and data management module. And in each chapter it introduces the modules' design idea and design process.In this article we construct a independent graphics modeling system through to design the graphics primitive class,graphics primitive function and network topology structure,and use the graphics modeling system we can modeling for any power system.In fault calculation the software adopt the method of using matrix data method completely to calculate the fault data, and also improve the data operation speed and precision greatly.Customer can quickly determine the data by using the fault analysis function, and quickly locate the fault point by using the function of view the fault point position.So it has strong practicability in the fault recovery processing of the power system and ensure the power supply reliable.According to the setting guide for power system protection equipment,we provides detailed setting rules and design two setting modes that are automatic setting and manual setting. The users can confirm the value based on their own experience.The software realized the function of real-time display the setting process when the customers use the setting calculation function. According to the situation of protection mismatch and sensitivity insufficient, the software will make striking remind in the setting calculation process and the setting calculation sheet.Thus avoiding the setting personnel from make mistake for negligence.The software will according to user defined template to provide the setting calculation sheet and the value sheet.In addition, through the design of the data management function, the software realizes the centralized back-stage information management of the power system ,and ensure the validity and security of the data management of the power network. Based on modeling to the actual local grid and comparing the result with the manual calculation result, it is proof the results are correct and the software has validity and accuracy.So the software has high practical value and application value in improving the setting calculation's working efficiency, ensuring the power system's safe and reliable operation and promoting the power network's management modernization. And more important is the application of the software will be able to bring the huge economic value and social benefits.