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Under the existing 3/2 connection mode, the incompletion between the configuration of the protection and transformer leads to the existence of the dead zone. When the fault occurs in the dead zone, line protection and breaker failure protection are generally matched with each other to achieve the complete isolation of the fault. This approach will make the scope of the circuit breaker to expand, and...
This paper proposes a novel wide area back-up protection algorithm that measures synchronized information from different buses in region. The amplitude of voltage fault component from different buses is compared, and the bus with maximum magnitude will be selected. Hence, suspected fault line set could be established according to the sub-graph and complete incidence matrix of selected buses. Then,...
Different stator winding types of multi-branch generator lead to different internal short circuit fault aggregation, and the main protection scheme research must base on this fault aggregation to educe the optimized branch grouping style on neutral side and the main protection configuration principles. The paper analyzed the stator winding type and internal short circuit faults of 250 MW generator...
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...
MCT connected in circuit alters internal electrical parameters of generator. This means the generator mathematical model isn't identical with the generator in experiment. This makes the generator modeling more complicated. Rogowski coil doesn't contact with measured circuit. It won't change parameters of generator. Based on simulation and experiment, the paper introduces a current sensor composed...
Hilbert transformation is an ideal phase shifting tool in data signal processing. Being Hilbert transformed, the conjugated one of a signal is obtained. The Hilbert modulus is defined as the square of a signal and its conjugation. This work presents a method by which rotor faults of squirrel cage induction motors, such as broken rotor bars and eccentricity, can be diagnosed. The method is based on...
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