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According to the demand of 126kV intelligent switch with intelligent operative box, an intelligent terminal device by using cooperation control of embedded CPU(STM32F103ZET6 ARM) and Field Programmable Gates (Cyclone?EP2C8Q208C8 FPGA), which is up to the IEC61850 standard, is designed in this paper. Research program of the device is discussed. Starting from the modularization structure design, function...
To improve the deficiencies of traditional symbol-based location, express the disturbance direction more reasonably, and locate the disturbance source accurately, this paper presents a new method to locate power-quality disturbance source. The method decomposes the disturbance signal to multi-scale using the wavelet transform, and extracts the transient disturbance signals and the steady-state disturbance...
In general, the microgrid can operate in both grid-connection mode and islanded mode that challenges the traditional over-current protection scheme in the distribution network. The novel research and development of protection, including both the microgrid and distribution network are comprehensively analyzed in this paper, which mainly focuses on two aspects. The first one analyses the impact on the...
The flux-current characteristic of the voltage transformer plays an important role for non-linear Ferromagnetic analysis. The disadvantage of traditional excitation curve fitting method using the model of polynomial terms lies in that the linear part fitting is not perfect, while, the non-linear part has the good fitting results, which is not accord with the PT excitation characteristic. With fitting...
Self-adaptive system islanding refers to the separation of an interconnected power system into electrically isolated islands automatically based on the identification of unstable mode. A fast searching algorithm for self-adaptive power system islanding, which is called multilevel reduced graph partitioning (MLRGP) algorithm, is presented in this paper. The aim of this algorithm is that the generation...
The neutral point potential of the grounding transformer will be changed when HVDC system operates in a dc monopole ground return mode and dc bias may be generated. Dc bias will change exciting currentdasias waveform. Then large quantity of even and odd harmonics will be produced. The harmonics will do harm to the transformer and its protection. This paper uses PSCAD/EMTDC to create a simulation model...
This paper introduces a new concept for EHV transmission line protection, the boundary protection, which can instantly discriminate faults at any point of the protected line relying on only single-ended measurement of the fault induced transient information. Part I of the paper introduces the time-frequency spectrum characteristics of fault-induced transients. The spectrum analyses show that: (i)...
This paper presents the discriminative criterions of the boundary protection for EHV transmission lines. The boundary protection relay consists of three parts, the start unit, the direction unit and the boundary unit. The fault discriminative criterions of the relay are based on the single-ended transient information extracted by the wavelet transform. The tests using EMTP simulations and recorded...
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