Insulator Leakage Current Sensor Disc Monitoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for monitoring leakage currents on porcelain and glass insulator disc strings in transmission systems are inadequate, leading to potential flashovers and power outages due to contamination, as they do not provide a means for continuous monitoring and preventative measures.
Innovation Solution
A sensor apparatus and method that attaches to the cap of an insulator disc string, featuring a sensor disc with conducting and insulating layers, and electronics for measuring and wirelessly communicating leakage currents, ensuring reliable detection and reporting without impacting the dry arc distance or requiring wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wrapping metal bands around the wood pole and connecting it to the insulator hardware, then the reduction in the insulated wood path lengths is limited, but this method does not provide continuous monitoring capability and may cause corrosion at metal-to-wood interfaces
Solution Approach 1:
The patent replaces mechanical connection methods (metal bands, bond wires) with a sensor apparatus that uses electrical fields and electronic detection to monitor leakage currents. The sensor unit attaches to the insulator hardware and measures leakage current through electrical sensing, eliminating the need for complex mechanical bonding and providing continuous monitoring capability.
Solution Approach 2:
The patent introduces a sensor apparatus as an intermediary between the insulator hardware and the monitoring system. The sensor unit acts as a mediator that detects leakage currents without requiring direct electrical connection to the insulator string, allowing continuous monitoring while maintaining insulation performance.
2Reliability
If bonding insulator hardware together with a conductor to balance leakage current, then only a small residual current flows in the pole, but this method requires careful material selection to prevent corrosion and does not provide continuous monitoring
Solution Approach 1:
The patent replaces the mechanical bonding method with an electronic sensing system. Instead of using conductors to balance leakage current, the sensor apparatus electronically detects and monitors leakage currents, providing continuous data without requiring complex material selection or bonding procedures.
Solution Approach 2:
The patent implements continuous monitoring with feedback capability. The sensor apparatus continuously measures leakage currents and can alert operators when thresholds are exceeded, providing real-time feedback for proactive maintenance, unlike static bonding methods that only passively manage leakage current.
3Reliability
If using steel cross-arms to bond insulator bases together, then the insulator bases are connected, but this method does not provide continuous monitoring and requires grounding decisions that affect wood insulation performance
Solution Approach 1:
The patent replaces mechanical cross-arm bonding with an electronic sensing system. The sensor apparatus attaches to existing insulator hardware and provides continuous monitoring without requiring additional mechanical connections or grounding configurations, simplifying the overall system while maintaining reliability.
4Reliability
If upgrading insulators to those with improved contamination performance, then contamination resistance is enhanced, but this does not provide continuous monitoring of leakage current conditions
Solution Approach 1:
The patent implements continuous feedback monitoring of leakage currents on existing insulators. The sensor apparatus provides real-time data on leakage current conditions, allowing operators to monitor the actual performance of insulators under contamination conditions without requiring upgraded hardware.
Solution Approach 2:
The patent introduces a sensor apparatus as an intermediary that measures leakage currents without interfering with the insulator performance. This intermediary device provides continuous information about contamination-related leakage currents while working with existing insulator hardware.
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 solution enables continuous monitoring and reporting of leakage currents, allowing for timely mitigation of potential issues, improving reliability and reducing the risk of flashovers and power outages by providing processed information for decision-making.
Implementation Method 1
Leakage currents on a surface of the insulator disc are intercepted by the sensor disc and transferred to the housing for processing and communication by the electronics
Data Source
AI summary
An apparatus and method for accurately detecting and monitoring leakage currents on porcelain and glass insulator disc strings is disclosed. The sensor apparatus includes a sensor unit configured to attach to a cap of an insulator disc string. The sensor unit includes a sensor disc configured to surround the cap and a housing connected to the sensor disc. The sensor disc includes a conducting lower disc set, a conducting upper disc set, an insulating disc set sandwiched between the upper and lower conducting disc sets, and a conducting mesh connected to a bottom of the lower disc set. The housing including electronics configured to measure and communicate leakage currents on an insulator disc. Leakage currents on a surface of the insulator disc are intercepted by the sensor disc and transferred to the housing for processing and communication by the electronics.