Using the D-S evidence theory, according to the chemical analysis of the aquifer water in underground shafts, and selecting 6 kinds of ion concentration as the discriminate indexes for the identification of water inrush source, the model of water inrush source identification of mine was established. Firstly, according to 35 groups of sample data of the main aquifer in Jiaozuo mining area, China...

During the switching on/off of shunt capacitor banks in substations, vacuum circuit breakers (VCBs) are required to switch off or to switch on the capacitive current. Therefore, the VCBs have to be operated under a harsh condition to ensure the reliability of the equipment. This study presents a complete comparison study of ordinary and phase-controlled VCBs on switching 10 kV shunt capacitor b...

A serious inrush current may occur when a power transformer is re-energized, which will cause many adverse effects on equipment and the grid. The corresponding potential hazards can be reduced if existing residual flux density (Br) accurately measured. Combined with field-circuit coupling analysis method, novel method for measuring Br based phase difference between applied AC voltage resulting ...

Autonomous photovoltaic panels are intermittent sustainable energy sources which require energy storage to balance generation and demand, as photovoltaic generation is time and weather dependent. Traditionally batteries are the most common storage technology for photovoltaic systems. Photovoltaic batteries can encounter extended periods of low State of Charge (SOC), resulting in sulphation and ...

This paper proposes a low vibration stopping method by switching between the free-run and short-circuit braking modes of compressor. Vibrations are generated bouncing rotor caused load torque fluctuations. The proposed suppresses motor during suction process, thereby preventing generation large torque. In order to stop switches from mode at top dead center, which is starting point process. Furt...

The main reason of voltage instability in stand-alone power supply systems is the electric drive motors inrush current, which are usually higher than their nominal value. most reasonable way to solve this problem using capacitive energy storage. purpose research shape and measurement monitoring battery-capacitive storage device current characteristics. Parameters comparative analysis for lithiu...