At 20:18 on April 6, the 750 kV Xizhou Substation of State Grid Gansu EHV Corporation 750 kV Xidong Line I and Xiguan Line I EHV lines were officially transferred to live operation. It is understood that this is the first case in the country to apply the "one-key sequential control" technology to the start-up of a 750 kV line, opening a new page for the digital construction of Gansu power grid. Since then, the equipment switching operation of the highest AC voltage level in the northwest area has successfully entered the "minute and second" era.
"Why is the operation of Xizhou Substation so fast?" During the start-up operation, the on-duty dispatcher raised a question. "Because of the one-button sequential control operation we use, the task of operating a single switch or knife switch is completed in tens of seconds." Zheng Xiujie replied confidently.
It is understood that two 750 kV lines are started at this stage, and the operation procedure is divided into three test steps, involving 27 lines in the Xizhou substation. The total operation time is only more than 300 minutes, and the final overall start-up procedure takes more than 20 hours. , Two 750 kV lines of Xizhou Substation were successfully connected to the Northwest 750 kV main network for operation. Such a standardized, orderly, accurate and rapid start-up operation process is applied to 750 kV equipment for the first time. The "one-key sequential control" of Xizhou Transformation will open a new highland for the digital construction of Gansu's main network, and play a strong role in promoting the rapid realization of "two replacements" for the Northwest main network.
It is reported that the "one-key sequential control" technology adopts advanced information technology, realizes information sharing through digitization, networking, and informatization, and realizes intelligent operation management of data collection, calculation, and control integrated substation. The operation steps are started with one key, the operation process is automatically executed in sequence, and the equipment status and operation mode are automatically converted... This technology improves the operation efficiency to 4-5 times that of the traditional mode, reduces the workload by 40%, and saves more than 50% of the operation The response time of the power grid to power flow changes is greatly shortened, the site safety and operation accuracy are greatly improved, and the risk of misoperation is basically eliminated.
The 750 kV Xidong Line Ⅰ and Xiguan Ⅰ Line are the original Dongguan Ⅰ Line connected to the 750 kV Xizhou Substation and started operation again "hand in hand". The hydropower transmission from the upper reaches of the Yellow River provides strong power, improves the flexibility and stability of the main grid and the power grid in central Lanzhou, and enhances the grid-connected power transmission capacity of new energy in Northwest China.
In the next step, State Grid Gansu EHV Co., Ltd. will summarize technical rules, accumulate valuable experience, deepen the digital construction of substations, spread from one to many, and spread from point to surface, and comprehensively promote the "one-key smoothing" of all 12 750 kV substations under its jurisdiction. Control" technology transformation, deepen the effective integration of "two substitutions" and power grid equipment management, continuously improve the informatization, intelligence, and lean level of equipment management and control, and make every effort to ensure the safe and stable operation of Gansu's main grid.
