Impedance matching unit, system and method used for calibrating high-frequency current sensor

Abstract

The invention discloses an impedance matching unit, a system and a method used for calibrating a high-frequency current sensor. The impedance matching unit is a transmission line structure formed by a radio frequency coaxial line with the characteristic impedance being 50ohm. The high-frequency current sensor is installed at a central position inside the impedance matching unit. The transmission line structure comprises a radio frequency coaxial input end, a radio frequency coaxial output end and a shell, wherein a core wire inside the transmission line structure penetrates through the radio frequency coaxial input end and the radio frequency coaxial output end; and the shell transits towards the middle from the radio frequency coaxial input end and the radio frequency coaxial output end so as to form a conical transition structure. The impedance matching unit disclosed by the invention solves a technical problem in relevant technologies that broadband characteristics of the high-frequency current sensor cannot be authentically reflected due to a calibration result of a high-frequency current sensor performance detection method in a high frequency interval has great distortion because of deficient impedance matching and bandwidth and the like.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to an impedance matching unit, system and method for calibrating a high-frequency current sensor. Background technique [0002] Partial discharge is a non-penetrating discharge phenomenon caused by local defects in the insulating medium. Local defects (such as bubbles, cracks, suspended metal particles and electrode burrs, etc.) Partial discharge faults occur under certain operating conditions. Partial discharge is an important symptom of insulation cracking in the long-term operation of electrical equipment such as transformers and cables. Partial discharge failures in equipment can eventually lead to catastrophic failure of electrical equipment if they remain undetected and untreated. Partial discharge detection can effectively reflect the internal insulation faults of high-voltage electrical equipment, especially for the early detection of sudden faults, which is much more effe...

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide an impedance matching unit, system and method for calibrating high-frequency current sensors, so as to at least solve the problem of calibration results in the high-frequency range of the high-frequency current sensor performance detection method in the related art due to impedance matching and insufficient bandwidth. The reason is that there is a large distortion, which causes technical problems that cannot truly reflect the broadband characteristics of the high-frequency current sensor

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