Design of Power Supply for On-line Monitoring System of Transmission Lines

Kai Chen, Zi-jian Zhao, Yu-ning Zhang, Yang-chun Cheng, Yuan Dai

Guangdong Power Test & Research Institution, Guangzhou, Guangdong Province, China.
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, Beijing Key Laboratory of High Voltage and EMC, North China Electric Power University, Beijing, China.
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, Beijing Key Laboratory of High Voltage and EMC, North China Electric Power University, Beijing, ChinaState Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, Beijing Key Laboratory of High Voltage and EMC, North China Electric Power University, Beijing, China.

DOI: 10.4236/epe.2013.54B109                

Abstract

This paper uses CT to gain the energy directly from the high-voltage transmission line, to address the problem of power supply for monitoring system in high voltage side of transmission line. The draw-out power coil can induce voltage from the transmission line, using single-chip microcomputer to analog and output PMW wave to control the charging module, provides a stable 3.4 V DC voltage to the load, and solve the problem of easy saturating of core. The power supply based on this kind of draw-out power coil has undergone the overall testing, and it is verified-showing that it can properly work in a non-saturated status within the current range of 50 - 1000 A, and provide a stable output. The equipment also design protection circuit to improve the reliability to avid the impacts of the impulse current or short-circuit current. It effectively solves the problem of power supply for On-line Monitoring System of Transmission.

Keywords

Monitoring System; Power Supply of High-voltage Transmission Line; Draw-out Power Coil; Single-chip Microcomputer

Conflicts of Interest

The authors declare no conflicts of interest.

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