Mobile Machinery E-Field Sensing for Overhead Power Line Avoidance
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Solution Overview
Problem
Mobile machinery operators are at risk of accidental contact with overhead power lines due to 'inattention blindness,' leading to potential fatalities, as current safety measures are inadequate in preventing such incidents.
Innovation Solution
An electrical safety apparatus for mobile machinery, comprising a sensor module with an E-field sensor plate for capacitive coupling, a sensor processor for frequency and amplitude discrimination, a transmitter, and a controller that interfaces with the machine's control system to restrict movement when hazardous proximity is detected, ensuring the E-field voltage remains below a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mobile machinery operates near overhead power lines to perform work tasks, then productivity is improved, but the risk of electrical contact and fatalities increases due to operator inattention blindness
Solution Approach 1:
The safety apparatus performs preliminary detection of E-field voltage gradients before contact with power lines occurs. The sensor processor continuously monitors the environment and generates early warning signals when hazardous voltage levels are detected, allowing operators to take preventive action before entering dangerous zones.
Solution Approach 2:
The system provides continuous feedback to operators through visual and audible warnings when E-field voltage gradients exceed safe thresholds. The controller receives sensor data, processes it through frequency and amplitude discrimination, and immediately feeds back restriction signals to the machinery control system, creating a closed-loop safety mechanism.
2Reliability
If safety monitoring systems are added to mobile machinery, then electrical safety is improved, but device complexity increases
Solution Approach 1:
The sensor processor performs multiple functions including frequency discrimination, amplitude discrimination, and threshold comparison within a single integrated unit. The controller both monitors safety conditions and directly interfaces with the machinery control system to restrict movement, combining monitoring and control functions in one system.
Solution Approach 2:
The system replaces complex mechanical safety barriers with electronic field detection. Instead of physical guards or barriers that would complicate the machinery structure, the invention uses electromagnetic field sensing and electronic processing to detect hazardous conditions and control machine movement through software-based restrictions.
3Reliability
If the machinery is restricted from moving when hazardous proximity is detected, then safety is improved, but productivity decreases due to movement limitations
Solution Approach 1:
The safety system dynamically adjusts machine movement restrictions based on real-time E-field conditions. When hazardous voltage gradients are detected, the controller restricts movement in dangerous directions while potentially allowing movement in safe directions. Once the machinery moves to a safer position and E-field levels decrease below thresholds, normal movement restrictions are lifted, allowing productivity to resume.
Solution Approach 2:
The system takes preliminary anti-action by restricting movement before actual contact with power lines occurs. By detecting E-field voltage gradients and predicting potential contact zones, the controller prevents the machinery from entering hazardous areas in the first place, rather than reacting after contact occurs. This proactive approach minimizes productivity loss by avoiding dangerous zones before they become critical threats.
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
The apparatus effectively prevents mobile machinery from contacting electrical conductors by restricting movement when hazardous proximity is detected, thereby reducing the risk of electrical shock and fatalities, and logs operational data for forensic purposes.
Implementation Method 1
an E-field sensor plate configured to sample an E-field voltage gradient by means of capacitive coupling with an E-field proximate the sensor module
Data Source
AI summary
Electrical safety apparatus for mobile machinery. Apparatus broadly comprises at least one sensor module, which has i) an E-field sensor plate configured to sample an E-field voltage gradient by means of capacitive coupling with an E-field proximate the sensor module; ii) a sensor processor arranged in signal communication with the sensor plate and configured to a. apply frequency discrimination to the voltage gradient; b. if the frequency discrimination satisfies a predetermined frequency range, apply amplitude discrimination to the frequency discriminated signal; and c. if the amplitude discrimination satisfies a predetermined amplitude threshold, generate a limiting signal. Sensor module also includes iii) a transmitter arranged in signal communication with the sensor processor and configured to transmit the limiting signal, and iv) an energizing arrangement configured to provide electrical energy to the sensor processor and transmitter. Apparatus also includes a controller having i) a receiver for receiving the limiting signal; ii) a memory arrangement; and iii) a controller processor arranged in signal communication with the receiver and memory arrangement and configured to interface with, and control, an existing control system of the mobile machinery in accordance with the limiting signal to only allow movement of the machinery, which, when the limiting signal is generated, reduces the sampled E-field voltage below the predetermined amplitude threshold, the controller processor further configured to log details of the limiting signal and associated control in the memory arrangement for forensic purposes.