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

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 23/08/2018, Accepted 19/09/2018, Published 23/10/2018

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 cm2 at 5.8 GHz. The antenna meets the energy requirements of the EFS which is 10 m far from the source.

Inspec keywords: HVDC power transmission; microstrip antennas; electric field measurement; receiving antennas; inductive power transmission; electric fields; power supply circuits; microwave power transmission; permittivity

Other keywords: gain 4.26 dB; important electromagnetic environment parameter; wireless energy supply solution; battery-powered solution; measurement results; frequency 5.8 GHz; distance 10.0 m; DC electric field strength; wireless power transmission systems; wireless power supply circuit; EFS; high-voltage electric field environment; independent DC electric field sensor; potential isolation; microwave wireless power transmission system; HVDC transmission line; power system; space electric field

Subjects: Single antennas; Voltage measurement; Power electronics, supply and supervisory circuits; d.c. transmission; Radio links and equipment; Wireless power transmission

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