Field measurement and verification of the UHF calibration platform based on the GTEM cell

Abstract

The measurable electric field of the partial discharge ultra-high-frequency (PD UHF) detection system calibrated by a gigahertz transverse electromagnetic cell (GTEM) has been used as a key indicator to evaluate the performance of the detection system and regarded as the electric power standard. In this study, the sweep frequency and pulse signal were injected to the GTEM cell, and then the waveform and amplitude of the calibrated field strength were calculated by using the transfer function and voltage response of the monopole antennas. In the case of sweep frequency, comparing the measured result of the Narda field strength metre and the calculated result of monopole antennas, the error was found to be <8%, which verifies the correctness of the calibration of the monopole antennas to the steady-state electric field in the GTEM. In the case of pulse injection, comparing the simulation result of computer simulation technology and the calculated result of monopole antennas, the error of the peak of the field strength was found to be 1.7%, which verifies the correctness of the calibration of the monopole antennas to the pulse electric field in the GTEM.

Keywords

• calibration
• electric fields
• TEM cells
• partial discharges
• UHF detectors
• monopole antennas
• steady-state electric field
• calculated result
• pulse electric field
• pulsed electric field
• PD UHF detection system
• field measurement
• UHF calibration platform
• GTEM cell
• measurable electric field
• partial discharge ultra-high-frequency detection system
• gigahertz transverse electromagnetic cell
• electric power standard
• consistent measure standard
• calibrated electric field
• sweep frequency
• calibrated field strength
• measured result
• Narda field strength metre