There is a diversity of grounding faults in distribution network lines, and different types of faults may lead to different states and signal changes. Therefore, a fault state grounding diagnosis method for distribution lines based on waveform similarity and random matrix is proposed. The principle of waveform similarity is used to determine whether the single-phase fault current is abnormal. By using the random feature matrix, the time series of the original fault data set is calculated, and the location of the fault point and the specific category of transmission fault is determined by identifying the fault spectrum of the data current and voltage signal. The single-terminal method and double-terminal method are used to diagnose the single-phase grounding fault of the distribution network accurately. The experimental results show that there is no confusion among the various fault features extracted by this method, and the application effect is better.
The fall of electric power operation scene is directly related to the life safety of aerial workers. In order to effectively warn the abnormal situation, an alarm method of electric power operation scene fall considering the long-distance dependence of local blocks is proposed. Firstly, the power operation scene fall alarm is divided into five grades, and according to the grade results, the rules of power operation scene fall danger zone delineation, warning signs, restricted traffic, safety equipment requirements and emergency plan are established, so as to establish risk warning indicators and complete power operation scene fall alarm. The experimental results show that the acceleration of power operation scene falling under no-load condition is higher than that under full load condition. This method can accurately identify the falling event and give an alarm in time, with high alarm accuracy and effect.
In order to solve the contradiction between the increasing electricity demand and the gradual depletion of fossil energy, more and more DGs which use clean, renewable energy are connected to the distribution network, so the traditional distribution network topology has changed and the original traditional protection methods can no longer be accurate operation. The new protection method is needed to be proposed to adapt to the new type of distribution network. Based on analysing the fault characteristics of the new type of distribution network resonant grounding system with distributed power generation, a single-phase grounding fault protection method based on skewness and transient energy characteristics of zero-sequence current is proposed in this paper. At first, it is proposed to use the skewness of the high-frequency components of the zero-sequence current to select the fault line. Then the proposed protection method locates the fault section by calculating the transient energy of each section of the faulty line. Finally, the simulation of new type of distribution network is built on PSCAD, and the results prove the effectiveness of the proposed method.
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