Design of Phase Selection Controller for High-voltage Switch
The high-voltage switch for opening and closing is controlled through a phase selector in substations,to solve the prob-lems of overvoltage and inrush current with no-load lines switched,capacitor banks,or reactors;However,due to the complex struc-ture of the high-voltage switch,its mechanical characteristics are easily affected by external environment,and the stability of opera-tion is poor,resulting in low precision of phase selection control;To solve this problem,a phase selection controller based on ARM+FPGA dual core architecture is developed;The ARM chip completes the calculation of phase selection command delay time,human-machine interaction,and other tasks;The FPGA chip mainly performs the data collection,logic control,and other tasks;At the same time,the device can connect multiple external sensors to predict and correct the switch operation time,thereby ensuring the ac-curacy of the phase selection control;The performance of the phase selection control is verified on the test platform;The experimental results show that the deviation of the phase selection controller is less than 0.08ms;The maximum deviation of the 550kV high-volt-age switch phase selection controll system based on this device is less than 1ms,which can control the switch to complete the opera-tion in the preset phase,and the product performance can meet engineering requirements.
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