The Study And Application Of Wuhai Grid 35kV And Below Line Protection Setting Software

Currently under the jurisdiction of the grid voltage level of 35 kV and below the line more than three hundred Wuhai, to provide power for the Wuhai City and the surrounding areas, factory and people’s daily lives. Such line protection setting calculation of seemingly simple, in fact, if calculated correctly, could make the trip in normal power line caused the process to people’s life and production losses; accidents may also occur in lines or user It does not trip, resulting in loss of business. These failures ranging from damage to electrical equipment, while destabilizing the system operating in parallel, so that the whole system collapse. With the growing social power load, every year new lines or change the line cut, relay setting calculation larger workload, accounting for over 40% of the daily workload. Setting calculation manual calculations previously used to calculate the time is longer, lower operational efficiency and reasonable is important to improve the performance of protection operation.In this paper, the use of the line current protection relevant basic theory, combined Wuhai Run grid and grid obtained by setting the parameters and the region line tuning of the needs of a given principle to study the bus equivalent impedance calculation and fault calculation, interface the data entered in its corresponding setting formula to achieve in accordance with the principle of setting the selected data operation, and it outputs the calculation result in the corresponding box, to achieve its visualization capabilities, and design of the interface.Finally, this paper Wuhai power grid up to 35 kV line protection setting calculation software, a substation 10 kV, 6.3kV and 35 kV circuit current protection setting calculation, and the results are examples of simulation and verification, to verify the design software reliability, on-site applications also reflects the more convenient.