Non-invasive cable voltage measurement sensor

Abstract

The invention provides a non-intrusive cable voltage measurement sensor. The sensor comprises an upper cover (1), a measured cable (2), a shell (3), a bottom cover (4), an upper cover fixing hole (5), a fixing shaft (6), an induction electrode (101), a reference electrode (102), an insulating medium (103), a coaxial line via hole (104), a hardware circuit module (201), a coaxial line (202) and a circuit board fixing hole (203). The sensor measures voltage in a non-contact mode based on the electric field coupling principle, and meanwhile a reference signal is introduced to compensate measurement errors. When the position or the wire diameter of the measured cable changes, the coupling voltage of the induction electrode and the reference electrode can change, the coupling voltage variation of the reference electrode is used for compensating the coupling voltage change of the induction electrode caused by the change of the measured cable, and the accurate measurement of the voltage of the measured cable when various wire diameters and mounting positions change is realized.

Description

technical field [0001] The invention relates to the field of voltage measurement sensors, in particular to a non-invasive cable voltage measurement sensor. Background technique [0002] At present, cable voltage measurement equipment includes voltage transformers, direct contact meters, and non-contact measurement sensors based on electric field method inversion. Potential transformers and direct-contact meters cannot measure voltage without breaking the outer layer of power wire insulation, and in some high-voltage applications may cause safety problems. The existing non-contact AC voltage measurement sensor realizes the non-contact measurement of voltage by detecting the alternating electric field around the tested cable, which is highly dependent on the distance, and requires secondary calibration after installation and fixing, and when the tested cable When the diameter changes or the distance from the sensing electrode changes, the measurement results will produce larg...

AI Technical Summary

Problems solved by technology

Potential transformers and direct contact meters cannot measure voltage without breaking the outer insulation of the power line and may cause safety problems in some high voltage applications

The existing non-contact AC voltage measurement sensor realizes the non-contact measurement of voltage by detecting the alternating electric field around the tested cable, which is highly dependent on the distance, and requires secondary calibration after installation and fixing, and when the tested cable When the diameter changes or the distance from the sensing electrode changes, the measurement results will have a large error. These shortcomings limit its practical use and promotion.

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