Wrap-Around Current and Voltage Measurement Device
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Solution Overview
Problem
Current methods for measuring current and voltage in power cables are invasive, require powering down devices, and result in system downtime or safety hazards, as they necessitate exposing conductors or modifying cables, making them impractical for continuous monitoring in applications like web or e-mail servers.
Innovation Solution
A semi-permanent wrap-around monitor with ring-mounted magnetic and/or electric field sensors that clamp around power cables, allowing non-position-dependent measurement of current and voltage without modifying the cable, using internal circuitry to analyze magnetic or electric fields and calculate the current and voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a current transformer is used to measure current in power cables, then current measurement capability is achieved, but cable modification is required which causes system downtime and safety hazards
Solution Approach 1:
The patent replaces the mechanical contact-based current transformer method with a non-contact electromagnetic field sensing system. The measurement device uses magnetic field sensors and electric field sensors to detect electromagnetic fields generated by current flow in the cable, eliminating the need to physically modify the cable or make mechanical contact with conductors. This allows continuous operation without system downtime while maintaining measurement capability.
Solution Approach 2:
The patent introduces electromagnetic field sensing as an intermediary between the current-carrying cable and the measurement device. Instead of directly contacting the cable conductors, the device senses the electromagnetic fields that naturally surround active cables. This intermediary approach enables measurement without physical intrusion, avoiding cable modification and ensuring safety during continuous operation.
2Measurement precision
If conductors are exposed for current measurement, then current can be measured, but safety hazards increase and system downtime occurs
Solution Approach 1:
The patent replaces direct conductor exposure with non-contact electromagnetic field sensing. The measurement device detects current by sensing electromagnetic fields around the intact cable, eliminating the need to expose conductors or make physical contact with live wires. This substitution maintains measurement accuracy while completely avoiding the safety hazards associated with exposed conductors.
Solution Approach 2:
The patent converts the potentially harmful electromagnetic fields radiating from active power cables into a beneficial measurement signal. Instead of treating the electromagnetic fields as interference or hazards to be shielded against, the device utilizes these fields as the measurement mechanism, allowing safe, non-contact current measurement while the cable remains energized and operational.
3Measurement precision
If manual measurements are performed with break-out boxes, then current measurement is possible, but repeated measurements are required as equipment changes
Solution Approach 1:
The patent enables continuous, ongoing current measurement by clamping the device around the power cable in a semi-permanent installation. Once installed, the device continuously monitors current flow without requiring removal or reconfiguration when equipment is added or removed from the power strip. This eliminates the need for repeated manual measurements and provides sustained monitoring capability.
Solution Approach 2:
The measurement device is designed to be universally applicable to power cables serving multiple devices. By measuring the total current in the power cable, the device provides information about the combined load of all equipment connected to the power strip, eliminating the need to individually measure or reconfigure measurements for each device change.
4Measurement precision
If toroidal current transformer is used, then current measurement is achieved, but incoming and outgoing currents create opposing magnetic fields that cancel each other
Solution Approach 1:
The patent uses electromagnetic field sensing as an intermediary to measure current without being affected by the opposing magnetic fields problem. The sensors detect the net electromagnetic field surrounding the cable, which represents the actual current flow, rather than attempting to measure individual conductor fields that would cancel each other out. This approach simplifies the measurement process while maintaining accuracy.
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 efficient measurement of current and voltage in power cables without system downtime or cable modification, providing accurate and continuous data without the need for re-calibration, and allowing quick re-deployment on different cables.
Implementation Method 1
the measuring device comprises a plurality of ring-mounted magnetic field sensors which sense magnetic fields produced by the electrical current in the conductors
Implementation Method 2
the measurement device may include a plurality of electric field sensors in addition to or in place of the magnetic field sensors, which sense electric fields produced by the electrical current in the conductors
Data Source
AI summary
The present invention is directed to a current and/or voltage measurement device that allows a user to easily and safely determine current flow by clamping a semi-permanent wrap-around monitor around the power cable without modifying the cable may comprise a plurality of ring-mounted magnetic field sensors which sense magnetic fields produced by the electrical current in the conductors and analysis circuitry for calculating the current in those conductors based on the magnetic field values. In other embodiments, the measurement apparatus may include a plurality of electric field sensors in addition to or in place of the magnetic field sensors, which sense electric fields produced by the electrical current in the conductors which may be used to calculate the voltage in the conductors.