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Ultra-high voltage (UHV) transmission possesses enormous economic benefits and technical superiorities, which is a new subject for China and must be studied emphatically. This paper introduces the actual configuration and parameter of UHV transmission under construction in China and its physical dynamic simulation (PDS) experiment model. According to the structure and operation characteristics of...
Closing a transformer without load will lead to the emergence of sympathetic inrush current in adjacent transformer. Sympathetic inrush current always causes mal-operation of protective relay and harmonic over-voltage. Based on simplified equivalent circuit of two shunt-wound transformers, the magnetic analytical expression and rule of bias magnet attenuation are analyzed. After that, the reasons...
The phenomenon of sympathetic interaction between transformers is discussed in this paper. A mathematical model is developed for two transformers in parallel and in series operation to analyze the origin mechanism of sympathetic interaction. At the same time, its characteristics are further analyzed by numerical simulation. The sympathetic inrush current could influence the transformer differential...
For the purpose of the monitor system in digital protection, the embedded real-time operating system (RTOS) and the embedded GUI (graphical user interface) is introduced to design the monitor system. Combining the necessity and the application value of the operation system, the choice of embedded Linux and Qt/Embedded is completely viable for the monitor system in digital protection for generator-transformer...
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