The Design Of The Main Electrical Wiring Of 110 KV Smart Substation

Smart substation is the basic link of the smart grid and the most critical link. With the basic requirements of total station information digitization, communication platform networking and information sharing standardization, it can collect the basic operation data, execute the corresponding commands and automatically realize functions including information collection, measurement, protection, measurement and monitoring etc. The smart substation can achieve the comprehensive interactions of equipment information, operation strategy and power dispatching, realize the whole-lifecycle integrated management in basic state, collect and share the real-time operation data of power grids, support the grid real-time control, intelligent adjustment and various advanced application, and ensure safe and stable operation of power grids at all levels.The paper focuses on the design of the main electrical wiring of 110 kV smart substation. The substation site and form are selected in accordance with the urban power supply requirements, and finally determine to be located in the north of jinan road and west of weihai road with indoor arrangement. On the basis of the analyzation of the original data with relevant technology and power supply reliability requirements, the final wiring plan has been obtained according to the design scale of substation and the universal design of the state grid. That is, the 110 kV power distribution device adopts GIS equipment and inner-bridge connection mode, while the 10 kv power distribution equipment takes metal switchgears of the steel-clad movable-type and the sectionalized single-bus configuration attaching with the main electrical wiring diagram. Two sets of main transformers are adopted in line with the city power supply, the substation capacity and the load calculation, each for 50 mva capacity. On this basis, the proper reactive power compensation shuold be taken in the low voltage side. The shortcircuit current calculations are made for all the electrical components selection. In addition, all the electrical equipments chosen under noral operation conditions are checked with three-phrase shortcircuit condition, including circuit breaker, isolating switch, current transformer, voltage transformer, lightning arrester and the outlet and inlet lines.The basic situation of smart substation has been explored. Based on the design and construction of the 110 kV smart substations, the paper has made a design plan of the main wiring and analyzed the system parameters, the main electrical wiring plan, the short-circuit current calculation and the main equipment type selection.The main wiring of this substation has been optimized in arrangement with consideration of the current research and construction situation of smart substation pilot projects. The design principle of the smart substation is to carry out the "24-word" design principles of the "two-type, one-" substation:people-oriented, environmental friendly, safe and reliable, simple and practical, innovative and optimal and resource-saving. It also highlights the features of saving energy, treating environment friendly, covering less land, reducing building area with room integration and saving investment. Besides, an implementation plan of the project is put forward in combination with the current application and implementation situation of domestic smart substations. This paper emphasizes the design and construction characteristics of smart substations, as well as its feasibility in the design and analysis of 110 kVsmart design and in equipment selection.