Overhead Conductor Sag Tracking for Dynamic Ampacity Limits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for determining the permissible continuous current in overhead power transmission and distribution lines are imprecise, unreliable, expensive, or complex, leading to underestimated ampacity values and increased risks of exceeding operating temperature limits and maximum deflection.
Innovation Solution
A dynamic estimation system using a satellite positioning receiver beacon to directly measure conductor cable deflection, combined with a remote computer for precise ampacity calculation based on geolocated position information and meteorological data, optionally enhanced with real-time kinematics and local sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a static approach (SLR) is used to calculate ampacity based on predetermined unfavorable meteorological parameters, then the calculated ampacity value is conservative and ensures safety margins, but the ampacity is significantly underestimated in most real-world situations and cannot control exceedances under exceptional conditions
Solution Approach 1:
The patent transitions from a static SLR approach to a dynamic DLR approach where ampacity is continuously updated based on real-time meteorological parameters and measured conductor deflection. The system dynamically adjusts the ampacity value to match actual operating conditions, allowing higher utilization during favorable conditions while maintaining safety margins through continuous monitoring.
Solution Approach 2:
The system implements feedback by measuring actual conductor deflection using satellite positioning and using this measurement to verify and adjust the calculated ampacity. The measured deflection serves as feedback to confirm whether the calculated ampacity is appropriate, enabling continuous optimization of the safety margin while improving productivity.
2Measurement precision
If mechanical tension sensors, vibration sensors, or other complex sensor systems are deployed to measure conductor deflection, then deflection measurement accuracy is improved, but device complexity and installation cost increase significantly
Solution Approach 1:
The patent replaces complex mechanical sensor systems (tension sensors, vibration sensors, tilt sensors) with a satellite positioning-based measurement system. By using GPS/GNSS receivers to directly measure the three-dimensional position of the conductor, the system achieves high measurement precision without the mechanical complexity and installation difficulties of traditional sensor systems.
Solution Approach 2:
The patent introduces satellite positioning signals as an intermediary measurement medium. Instead of directly measuring mechanical parameters like tension or vibration, the system uses satellite signals to measure position, which then serves as an intermediary to calculate deflection. This approach simplifies the measurement system while maintaining or improving accuracy.
3Device complexity
If traditional meteorological parameters alone are used to calculate ampacity, then the calculation model is simple, but the accuracy of ampacity estimation is insufficient due to model limitations and inability to capture actual conductor behavior
Solution Approach 1:
The system uses measured conductor deflection as feedback to verify and refine the ampacity calculation. The actual deflection measurement provides empirical data that confirms whether the calculated ampacity matches reality, enabling continuous improvement of estimation accuracy while maintaining model simplicity.
Solution Approach 2:
The patent enhances the calculation model by incorporating additional parameters beyond traditional meteorological data, specifically including measured deflection parameters from satellite positioning. This addition of parameters improves accuracy without significantly complicating the overall calculation approach, as the core thermal balance model remains intact.
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
Enables simpler, more precise, and cost-effective determination of permissible continuous current, reducing the risk of exceeding deflection limits and enhancing safety by directly measuring conductor sag with satellite geolocation, thereby improving line monitoring accuracy.
Implementation Method 1
A dynamic estimation system using a satellite positioning receiver beacon to directly measure conductor cable deflection, combined with a remote computer for precise ampacity calculation based on geolocated position information
Implementation Method 2
The permissible continuous current is expressed in amperes and is generally called 'amperage' for brevity. This portmanteau word is formed from 'ampere' and 'capacity' to express the concept of the electrical energy transport capacity related to the heating of conductors by the Joule effect.
Implementation Method 3
The ampacity, or maximum current that can flow continuously, is therefore dependent on this maximum permissible deflection, but also on meteorological data, which in turn influences the temperature of the conductor cable and its elongation due to thermal expansion.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
This system for dynamically determining the permissible continuous current in a conductor cable (12) suspended between two pylons (14) of an overhead power line (10) comprises: a beacon (16) attached to the cable, including a sensor (34) for a physical quantity and a telecommunications module (38); means (58) for calculating a current sag value for the cable from this physical quantity; and a remote computer (18) programmed to provide a value for the permissible continuous current as a function of the current sag value and a maximum permissible sag value. The beacon (16) is a locating beacon, whose sensor (34) is a satellite positioning receiver for providing geolocated position information. The calculation means (58) are means for calculating the current sag value from the geolocated position information provided by the positioning receiver.