Research of independent DC electric field sensor with wireless power supply circuit

Abstract

The DC electric field strength is an important electromagnetic environment parameter of the high-voltage direct current (HVDC) transmission line. Measurement results of the space electric field are dramatically affected by the size and the potential of the sensor. In addition, the battery-powered solution of electric field sensor (EFS) is not feasible, for the reason that in the high-voltage electric field environment, the replacement of the battery will bring security risks to the power system and workers. The wireless energy supply solution not only solves the problem of potential isolation of the sensor, but also ensures that the sensor can work continuously. Various wireless power transmission systems (WPTSs) were compared. Microwave wireless power transmission system (MWPTS) was selected as the power supply of EFS. The key boundary conditions of MWPTS were determined. Two microstrip receiving antennas were designed in this article. A good performance antenna with high permittivity substrate was designed, realising 4.26 dB gain with the area of 1 cm^2 at 5.8 GHz. The antenna meets the energy requirements of the EFS which is 10 m far from the source.

Keywords

• electric field measurement
• inductive power transmission
• electric fields
• microstrip antennas
• power supply circuits
• microwave power transmission
• HVDC power transmission
• receiving antennas
• permittivity
• space electric field
• battery-powered solution
• EFS
• high-voltage electric field environment
• power system
• wireless energy supply solution
• potential isolation
• wireless power transmission systems
• microwave wireless power transmission system
• independent DC electric field sensor
• wireless power supply circuit
• DC electric field strength
• important electromagnetic environment parameter
• HVDC transmission line
• measurement results
• frequency 5.8 GHz
• gain 4.26 dB
• distance 10.0 m