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The mathematic model for changes in shapes of corn leaf was brought forward basing on the growth process in corn leaf. By the means of techniques of computer graphics, the 3-dimensional visualization of leaf growth was realized on computers. The form parameters in the model definitely agronomy meaning, and can be combined with the agronomy model very well. The 3D visualization of the constructing...
This paper describes a novel principle for protecting busbars. The principle uses the ratio between the fault component voltage and the fault component differential current of the busbar to detect faults, which is defined as the fault component integrated impedance in this paper. The fault component integrated impedance of an external fault reflects the capacitance impedance of the busbar whereas...
A novel model parameter identification based bus-bar protection principle is proposed in this paper. An inductance model can be developed when an internal fault occurs on bus. By taking the inductance and the resistance of the model as the unknown parameters to be identified, the equivalent instantaneous impedance and the dispersion of the parameter can be calculated. Utilizing their difference, the...
In this paper, a novel transformer protection principle based on the excitation impedance is proposed. The excitation impedance of transformer can be calculated using fault components of terminal voltages and currents when external fault occurs, and which magnitude is large and which sign is positive. When internal fault occurs, the impedance calculated with fault component is the impedances of the...
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