Non-Contact Voltage Measurement Position Calibration
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Solution Overview
Problem
Conventional electrical parameter measurement devices often require galvanic contact, leading to safety risks and inaccurate measurements due to variable conductor positions, and existing calibration methods are inadequate for non-contact devices.
Innovation Solution
An electrical parameter measurement device with a front end that includes multiple conductive sensors and control circuitry to determine a calibration factor based on reference current signal data points, allowing for position-dependent calibration and accurate measurement of electrical parameters like voltage, current, or power without galvanic contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional voltmeters use galvanic contact with conductors, then measurement can be performed, but safety risks increase and insulation must be removed
Solution Approach 1:
The patent replaces the mechanical galvanic contact system with a non-contact electromagnetic sensing system. The measurement device uses electromagnetic fields to detect voltage and current without physical contact, eliminating safety risks associated with exposed conductors and probe contact while maintaining measurement capability.
Solution Approach 2:
The patent introduces electromagnetic fields as an intermediary between the measurement device and the conductor. Instead of direct electrical contact, the device senses electrical parameters through electromagnetic coupling, allowing measurement without breaking insulation or exposing conductors.
2Adaptability or versatility
If conductor position varies within the measurement device, then flexibility is improved, but measurement precision deteriorates
Solution Approach 1:
The patent employs feedback mechanisms where the measurement device detects the actual position of the conductor within the measurement chamber and adjusts calibration factors accordingly. This closed-loop approach maintains measurement precision despite position variations by continuously compensating for positional effects.
Solution Approach 2:
The patent changes calibration parameters based on detected conductor position. By measuring position-dependent effects and adjusting calibration factors in real-time, the system maintains measurement accuracy across different conductor positions within the measurement device.
3Reliability
If non-contact measurement is used, then safety is improved, but calibration complexity increases due to position dependence
Solution Approach 1:
The patent performs preliminary calibration measurements at multiple predetermined conductor positions within the measurement chamber. By pre-characterizing the position-dependent response at various locations, the system creates a calibration lookup table or model that simplifies real-time operation while maintaining accuracy.
Solution Approach 2:
The patent divides the calibration process into discrete position points within the measurement chamber. By segmenting the continuous position space into discrete calibration points, the system manages calibration complexity through structured multi-point calibration while enabling continuous position compensation during 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 safe and accurate measurement of electrical parameters by determining calibration factors for varying conductor positions, improving measurement precision and safety by eliminating the need for direct contact.
Implementation Method 1
a plurality of conductive sensors positioned proximate the front end; one or more reference voltage sources coupled to the plurality of conductive sensors
Data Source
Figure 1A
Figure 1B
Figure 2~3
AI summary
Systems and methods for operating and calibrating measurement devices are provided herein. The measurement devices generate reference current signals and sense the reference current signals in a conductor under test, which sensed signals are used to determine a calibration factor or a position of the conductor under test. A calibration system may control a calibration voltage source to selectively output calibration voltages in a calibration conductor. The calibration system may obtain data from the electrical parameter measurement device captured by the electrical parameter measurement device when measuring the calibration conductor. Such data may include one or more reference current measurements, one or more voltage measurements, etc. The calibration system utilizes the obtained measurements to generate calibration data which may be stored on the voltage measurement device for use thereby during subsequent operation. The calibration data may include one or more lookup tables, coefficients for one or more mathematical formulas, etc.