On December 24th, the on-line safety and stability analysis and calculation data source of the Liaoning smart grid dispatching support system was transformed from the local data of the Liaoning power grid to the data of the entire network of the Northeast Power Grid. On-line stability analysis thus led to the local grid exception caused by faults outside the Liaoning power grid area. Early warning and analysis. This move marks an important progress in the online security and stability analysis of Liaoning Power Grid. It is understood that Liaoning Power Grid is a typical receiver-end power grid, and is susceptible to situations outside the region. According to the data, in 2011, Liaoning Power Grid received a net electricity inflow of 45.5 billion kWh through the inter-provincial tie-line, accounting for nearly a quarter of the total electricity consumption in Liaoning. During the 12th Five-Year Plan period, with the continuous acceleration of power grid construction, the grid structure of the power grid will rapidly change, making the weak links and major issues of the power grid continue to change; inter-provincial power exchange will result in the emergence of stability problems in the inter-provincial power grid sections and continuous system interconnection. Tighter will also make the fault morphology more complex. The relevant person in charge of the Liaoning Electric Power Dispatch and Control Center stated that the above situation indicates that the local grid abnormalities caused by out-of-zone faults need to be highly regarded. To this end, Liaoning Electric Power Co., Ltd. has built an online safety and stability analysis system that integrates static, transient, dynamic, voltage, frequency, small-interference stability calculations, and short-circuit current calculations online to establish a complete set of online comprehensive safety Early warning and coordination of prevention and control analysis systems, realizing multi-dimensional, multi-angle, real-time analysis and early warning of weak links in the power grid. After the data source was converted from local data to data in the entire network of the Northeast Power Grid, the Liaoning Power Dispatch Control Center successfully resolved the limitation that the equipment outside the zone could not participate in the online expected failure stability analysis, and realized provincial and net data preparation and further improvement. The accuracy of online stability analysis calculations and the reliability of online assistance decisions. This achievement can make Liaoning Province Electric Power Co., Ltd. more convenient to carry out real-time safety early warning, improve the working efficiency of operators, reduce or even avoid accidents. Weld-Neck flanges or welding-neck flanges can be differentiated from all other types of flange by their long tapered hub. The Welding neck flanges is normally referred to as the high hub flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange. A weld neck flange (also known as a high-hub flange and tapered hub flange) is a type of flange. There are two designs. The regular type is used with pipes. The long type is unsuitable for pipes and is used in process plant. A weld neck flange consists of a circular fitting with a protruding rim around the circumference. Generally machined from a forging, these flanges are typically butt welded to a pipe. The rim has a series of drilled holes that permit the flange to be affixed to another flange with bolts. Welding Neck Flange,Welding Flanges,Butt Weld Fittings,ASME B16.5 Weld Neck Flanges Shandong Zhongnuo Heavy Industry Co.,Ltd. , https://www.znforged.com