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This paper presents a reclosing scheme for parallel lines on the same tower. The present reclosing scheme for parallel lines in China will result in opening both lines when any type of inter-circuit permanent fault occurs. In contrast, the proposed reclosing scheme is able to avoid opening both lines and keep a quasi-three-phase operation as far as possible for inter-circuit permanent faults, thus...
Micro-grid is required to be able to operate in the grid-connected mode and the autonomous mode. One of the key functions for such a system is to realize the seamless transition between the two modes. This paper investigates the impact of the islanding detection time on the mode transition of inverter-based micro-grid. First, an inverter-based micro-grid is modeled in the simulation environment of...
Single-phase Auto-reclosing (SPAR) is widely used on EHV/UHV transmission lines to improve power system reliability. However, reclosing on to a permanent fault can adversely affect the system stability and damage generators and other equipment connected to the line. To solve this problem, a new algorithm for improving the single-phase adaptive autoreclosure is presented in this paper. Firstly, primary...
The mal-operation of transformer differential protection will occasionally take place after the removal of external fault due to current-transformer (CT) saturation. Study show that CT saturation can be divided into three kinds. Firstly, the influencing factors of CT saturation and effect of CT saturation to transformer differential protection are studied. Secondly, this paper analyzes the characteristic...
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