Pilot-Wire Cable Detection for Three-Phase Mining Equipment
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Solution Overview
Problem
Current cable detection systems are ineffective for detecting three-phase AC power cables, which are commonly used in industrial settings, due to the zero net current change in these cables, posing safety hazards and operational disruptions.
Innovation Solution
A cable detection system comprising antennas and receivers on mobile equipment that transmit and detect a signal within a specific frequency range on a pilot wire, demodulating the signal into a data stream and comparing it to a reference to initiate an alert when a match is found, thereby preventing accidental contact with cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard electromagnetic detection is used for three-phase AC power cables, then the detection system can identify single-phase cables through current change, but it fails to detect three-phase cables due to zero net current change
Solution Approach 1:
The patent changes the detection parameter from current change (which is zero for three-phase cables) to electromagnetic field detection using antennas. This parameter change enables detection of three-phase cables while maintaining the ability to detect other cable types, thus resolving the contradiction between measurement precision and adaptability.
2Loss of information
If utility companies use underground utility maps, then they have recorded information about buried cables, but the maps are not updated or lack reliability
Solution Approach 1:
The system performs preliminary detection of cable locations before mobile equipment operates in the area. By detecting cables in advance using electromagnetic field sensing, the system provides real-time location information that supersedes outdated utility maps, reducing information loss and improving reliability.
Solution Approach 2:
The detection system provides continuous feedback about cable locations to the mobile equipment operator. This real-time feedback mechanism ensures that the most current cable location information is available, making the system more reliable than static utility maps that may be outdated.
3Measurement precision
If significant time and equipment are allocated to detect hidden utility infrastructure, then detection thoroughness improves, but current equipment cannot detect 5-7 kV three-phase AC power cables
Solution Approach 1:
The patent replaces traditional electromagnetic detection methods with antenna-based electromagnetic field detection. This substitution enables the system to detect high-voltage three-phase cables (5-7 kV) that were previously undetectable, maintaining detection thoroughness while overcoming the technical limitation of existing equipment.
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 system effectively detects three-phase AC power cables, enhancing safety and reducing operational disruptions by alerting operators or autonomous systems of nearby cables, preventing damage and costly repairs.
Implementation Method 1
one or more antennas installed on a mobile equipment, wherein each of the one or more antennas is configured to detect a signal
Data Source
AI summary
On industrial sites, especially sites which utilize remotely operated or autonomous mobile equipment, there is a significant risk that the mobile equipment may inadvertently contact trailing or buried cables. Traditional cable detection systems are unable to detect three-phase AC power trailing cables. Disclosed embodiments eliminate or reduce the risk of inadvertently contacting such cables. In particular, a signal may be injected into the pilot wire of each cable by a transmitter. A receiver on the mobile equipment may detect this signal on the pilot wire within a cable, and initiate an alert in response to detecting a signal.