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.
Highlights
The monitoring devices need to be installed directly in the transmission lines, so how to provide electrical power for the devices is one of the key issues we need to resolve
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
Experimenting Platform We choose the U93-MnZn ferrite U-shaped magnetic core which is produced by the Ferroxcube Company. after the calculation and experiments, the turns is chosen as 400, the diameter of enameled wire is chosen as 1mm.The draw-out coil can set in the transmission line with special design shell
Summary
The monitoring devices need to be installed directly in the transmission lines, so how to provide electrical power for the devices is one of the key issues we need to resolve. The laser energy has been applied in the electronic current transformers and active optical current transformer [2, 3], but such power is not suitable for work in the field. Using the capacitive bleeder is the use of a capacitor to obtain energy from the high-voltage transmission, but the stability and reliability of this method is poor, and the power of the method is limited [4]. The best way of power supply is using CT to take energy directly from the transmission lines. A new power supply used in high-voltage buses is designed and verified by experiments
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