Ground Wire Sensor for Insulator Flashover Localization
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Solution Overview
Problem
Current methods for detecting and predicting flashovers on power line insulators are costly and inefficient, as they require multiple sensors and complex calibration, and often rely on pilot insulators for contamination prediction rather than actual system data, leading to incomplete flashover prediction and increased maintenance costs.
Innovation Solution
A system with a current sensor on the ground wire that measures and processes discharge pulses, using spectral analysis and low-power peak detectors to estimate the location of contaminated insulators, and a wireless communication system to transmit data to a server for analysis, which reduces the need for calibration and optimizes maintenance efforts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are deployed per tower to detect partial discharges and localize contaminated insulators, then measurement precision and reliability improve, but device complexity and cost increase
Solution Approach 1:
A single sensor on the ground wire performs multiple functions: detecting partial discharge pulses, localizing contaminated insulators through signal processing, and providing flashover prediction data. This multi-functional approach replaces the need for multiple dedicated sensors per tower, reducing system complexity while maintaining measurement precision.
Solution Approach 2:
The ground wire acts as an intermediary medium that carries both the power function and the sensing function. By placing the sensor on the ground wire rather than directly on insulators, the system achieves indirect measurement of partial discharges, simplifying the overall sensor deployment architecture.
2Ease of manufacture
If pilot insulators are used to sample contamination for prediction, then cost is reduced, but prediction accuracy deteriorates because they do not represent actual system conditions
Solution Approach 1:
The actual insulator strings serve themselves as both the monitored objects and the sources of diagnostic information. By detecting partial discharge pulses directly from the insulators themselves rather than using separate pilot insulators, the system obtains authentic operational data that accurately reflects real contamination levels and flashover risks.
Solution Approach 2:
The invention extracts the diagnostic information (partial discharge pulses) directly from the operational insulators during normal system operation, eliminating the need for separate pilot insulators or sampling mechanisms while maintaining prediction accuracy.
3Measurement precision
If complex calibration procedures are implemented for accurate discharge pulse measurement, then measurement precision improves, but ease of operation deteriorates
Solution Approach 1:
The sensor system on the ground wire utilizes the natural electromagnetic coupling between the ground wire and insulator strings to automatically detect and measure partial discharge pulses without requiring external calibration equipment or procedures. The system self-calibrates through its operational measurement process.
Solution Approach 2:
The invention replaces complex mechanical calibration procedures with electromagnetic field-based measurement. By utilizing the inherent electromagnetic coupling in the transmission line structure, the system achieves accurate measurements through signal processing rather than physical calibration adjustments.
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 solution allows for accurate, remote, and cost-effective prediction of flashovers by reducing the number of sensors needed and improving power quality by guiding maintenance teams to the most critical areas, thereby minimizing washing operations and power sags.
Implementation Method 1
a current sensor is placed typically on the ground wire of a transmission line, which is further used to sense discharges on the power line
Implementation Method 2
The signal processor applies spectral analysis in order to determine the distance between the sensor and the contaminated insulator string
Data Source
AI summary
A system for the detection of discharges over high voltage power-line insulator strings of an electrical grid. A sensor unit is deployed on a non conducting cable of the grid. The sensor feeds an array of band cut-off filters receiving each signals from said at least one sensor unit. An analogue processor is associated with each of the band cut-off filters associated each with a current peak detector. An ADC unit is associated with each one of said analogue processors. In addition a digital processor is provided for calculating data received from each one of the ADCs and one radio transmitter unit sends data to a gateway of a network. A digital processor is adapted to send data processed based on the output of the ADCs, to the radio transmitter for conveying the data to processor associated with a WAN.