Ice Accretion Detection on Power Lines
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Solution Overview
Problem
Existing methods for monitoring sag in overhead power lines are inaccurate during atmospheric icing conditions due to uncertainties in conductor weight and temperature variations, leading to erroneous sag measurements and potential power outages.
Innovation Solution
A method that combines the measurement of sag and mechanical tension of suspended cable spans to determine the apparent weight change caused by ice or snow accretion, using a device with an accelerometer and strain gauge to monitor motion and tension, allowing for real-time detection of ice or snow accumulation without relying on external weather data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If indirect weather-based and model-based methods are used to determine sag, then the monitoring system can operate without direct mechanical sensors, but the measurement accuracy deteriorates due to uncertainties in conductor weight and temperature variations during icing conditions
Solution Approach 1:
The patent replaces indirect weather-based and model-based methods with direct mechanical measurements using accelerometers and strain gauges. The accelerometers measure conductor acceleration, and strain gauges measure tension, providing direct mechanical data about the conductor's actual state rather than relying on environmental models that fail during icing conditions.
Solution Approach 2:
The patent introduces intermediate computational processing that combines multiple sensor measurements (acceleration from accelerometers, tension from strain gauges, and weather data) through a unified physical model to calculate sag. This intermediary computational layer integrates data from different sources to overcome the limitations of any single measurement method.
2Device complexity
If only sag measurement is performed without tension monitoring, then the device complexity is reduced, but the ability to detect ice accretion deteriorates because apparent weight changes cannot be distinguished from temperature effects
Solution Approach 1:
The patent segments the measurement function into two independent components: sag measurement (using accelerometers) and tension measurement (using strain gauges). This segmentation allows each sensor type to specialize in measuring its specific parameter, and the combined data provides sufficient information to distinguish ice accretion from temperature effects through the relationship between sag, tension, and apparent weight.
3Measurement precision
If direct mechanical sensors (accelerometers and strain gauges) are installed on the conductor, then the measurement precision of sag and ice accretion is improved, but the device complexity and installation requirements increase
Solution Approach 1:
The patent makes the sensor system multi-functional by designing accelerometers and strain gauges that simultaneously serve multiple purposes: accelerometers measure both sag and ice accretion indicators, while strain gauges measure both tension and provide data for ice detection. This universality allows a single sensor installation to provide comprehensive monitoring data without requiring separate dedicated sensors for each measurement type.
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
This approach provides accurate and simultaneous monitoring of sag and icing conditions, reducing the risk of power outages by directly measuring the impact of ice or snow on conductor weight, thereby improving the reliability of power line monitoring systems.
Implementation Method 1
using a device with an accelerometer and strain gauge to monitor motion and tension
Implementation Method 2
using a device with an accelerometer and strain gauge to monitor motion and tension
Data Source
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AI summary
The present invention is related to a method for detecting and/or measuring atmospheric accretion on a suspended electrical cable span (2) of overhead power lines, said suspended electrical cable span (2) having a sag (D) and a local tension (H), and being submitted to wind pressure (wwind), comprising the steps of independently : - measuring said sag (D), and optionally measuring the wind pressure (wwind), over a first time range, - measuring the local tension (H) over a second time range, the results of both steps being complemented and/or combined, so that to allow atmospheric accretion detection and/or measurement.