Apparatus and system for non-contact current and voltage composite measurement
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Solution Overview
Problem
Existing measurement apparatuses only provide single measurement results for current or voltage, failing to meet the load measurement requirements of transmission lines.
Innovation Solution
An apparatus comprising a current signal detection device, voltage signal detection device, zero-crossing detection circuit, and control unit, which generate and analyze current-induced and voltage-induced electromotive forces to calculate phase differences and output current, voltage, and power values simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing measurement apparatuses are used, then single measurement results (current or voltage) can be obtained, but simultaneous current and voltage measurement requirements for transmission lines cannot be met
Solution Approach 1:
The patent combines current measurement and voltage measurement functions into a single integrated measurement apparatus. The device includes both a current sensor and a voltage sensor that work together to simultaneously measure both parameters, eliminating the need for separate measurement devices and resolving the contradiction between measurement versatility and device complexity.
Solution Approach 2:
The measurement apparatus is designed with multi-functional capability to perform both current measurement and voltage measurement through its dual sensor system. This universal design allows a single device to meet multiple measurement requirements for transmission line monitoring, improving adaptability without proportionally increasing complexity.
2Ease of operation
If non-contact measurement is implemented, then measurement safety and ease of operation are improved, but measurement precision may be affected
Solution Approach 1:
The patent uses magnetic field coupling as an intermediary mechanism for non-contact current measurement. The current sensor detects the magnetic field generated by the transmission line current without direct electrical contact, and through electromagnetic induction, converts it into an accurate voltage signal that can be processed by the measurement apparatus, maintaining precision while enabling convenient non-contact operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simultaneous measurement of current, voltage, and power values, better complying with transmission line load measurement requirements.
Implementation Method 1
the current signal detection device is fastened to a transmission line to be measured and is used to generate a current-induced electromotive force based on a current flowing on the transmission line to be measured
Implementation Method 2
the voltage signal detection device is fastened to the transmission line to be measured and is used to generate a voltage-induced electromotive force based on a voltage flowing on the transmission line to be measured
Data Source
AI summary
An apparatus for non-contact current and voltage composite measurement includes: a current signal detection device, a voltage signal detection device, a zero-crossing detection circuit, and a control unit. The current signal detection device generates a current-induced electromotive force based on current flowing on the transmission line to be measured when there is current-voltage passing through the transmission line to be measured; the voltage signal detection device generates a voltage-induced electromotive force based on voltage flowing on the transmission line to be measured when there is current-voltage passing through the transmission line to be measured. The zero-crossing detection circuit performs zero-crossing detection on the current-induced electromotive force and the voltage-induced electromotive force to determine the phase difference between them. After calibrating the phase difference by the control unit, the control unit can simultaneously output current value, voltage value and power value of the transmission line to be measured.