Leakage Current Meter with Remote Visual Indicator
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Solution Overview
Problem
Conventional leakage current meters used in bucket-trucks near high voltage lines often fail to effectively alert utility linemen due to background noise interference and lack of visual feedback, as they rely solely on audible alarms that may not be heard in noisy environments and do not provide real-time current readings to workers in elevated positions.
Innovation Solution
A leakage current meter system with a remote indicator unit equipped with a speaker and digital display, using EMI-resistant communication protocols like CAN to transmit alarm signals and current data from the truck-mounted meter to a remote unit on the boom arm, ensuring the lineman receives audible and visual warnings of dangerous leakage currents, even in high EMF environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an audible alarm is used to alert utility linemen of dangerous leakage current, then the meter can indicate safety status, but the alarm may not be heard in noisy environments such as near idling engines or traffic
Solution Approach 1:
The alert system is divided into separate functional components: an audible alarm component and a visual display component. The visual display shows current readings and alarm status independently, ensuring that if audio is blocked by noise, the worker can still perceive the alarm condition through visual cues.
Solution Approach 2:
The patent introduces a wireless communication system as an intermediary between the meter and the worker. The meter transmits alarm signals and current data wirelessly to a remote display unit, allowing the worker to view real-time information and alarm status without being physically near the noisy meter location.
2Reliability
If a conventional audible alarm is used, then the meter can indicate safe or unsafe conditions, but the worker in the bucket has no way of knowing the current readings
Solution Approach 1:
The system provides continuous feedback to the worker through the wireless communication system. Current readings, alarm status, and system state are transmitted in real-time from the meter to the remote display unit, allowing the worker to monitor the exact current values and understand the alarm conditions without leaving the bucket.
Solution Approach 2:
The wireless communication system acts as an intermediary that bridges the information gap between the meter (on the ground) and the worker (in the bucket). It transmits detailed current readings and alarm information wirelessly, eliminating the need for the worker to physically access the meter or rely on vague audible cues.
3Measurement precision
If the leakage current meter is placed on the truck bed, then it can monitor leakage current effectively, but communication of alarm signals to the worker in the elevated bucket becomes difficult
Solution Approach 1:
The wireless communication system serves as an intermediary that decouples the physical separation between the meter (on the truck bed) and the worker (in the elevated bucket). It transmits alarm signals and current data through air waves, eliminating the need for physical proximity or direct line-of-sight communication between the meter and worker.
Solution Approach 2:
The patent replaces mechanical or wired communication methods with wireless electromagnetic communication. This substitution allows alarm signals and current readings to be transmitted without physical connection, overcoming the barriers of distance, elevation, and potential interference from the truck's metal structure.
Data Source
AI summary
A leakage current meter can be mounted on a power company bucket-truck with the capability to detect an excessive amount of leakage current and send an alarm signal through harsh or extreme levels of EMI to a remote unit up in the bucket, causing an audible alarm in the bucket.