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This paper introduces the application of digital signal processor (DSP) at substation integrated automation system. Using the powerful digital signal processing capability of DSP, high-speed multi-channel data acquisition function, and excellent data communication capabilities of PCI(peripheral component interconnect) bus, substation integrated automation system can deal with a variety of complex...
In ungrounded power system, single-phase-ground fault is the frequent fault, and has much influence on the safety and stability of power system. This paper analyzes the fault system, and generalizes the determining methods of fault phase and fault line. On this basis, DSP (digital signal processor) intelligent protection device is built. The DSP device can search for fault phase and line rapidly and...
This paper proposes an adaptive protection scheme which has been developed through the analysis of short circuits in transmission lines. The method assumes a different protection pattern depending upon the distance between the fault position and the location of any protection devices. An adaptive threshold dependent upon the load on the system is used for initiation of the over-current protection...
The characteristic impedance of several typical eccentric coaxial transmission lines have been analyzed by the boundary element method (BEM) in this paper. The calculated characteristic impedance has been presented in detailed tabular forms. Numerical results provide an extension to the existing design data of coaxial transmission lines and are considered to be of great importance in practical applications.
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