High-Voltage Circuit Breaker Actuation Timing Control
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Solution Overview
Problem
High-voltage circuit-breakers in electricity networks face challenges in predicting optimal actuation times to minimize voltage surges and inrush currents, especially in complex and variable transmission line applications, leading to equipment damage and increased infrastructure costs.
Innovation Solution
A method that involves obtaining missing supply voltages, healthy phase/faulty phase discrimination, voltage analysis using a Prony model, and strategic closing or reclosing of the circuit-breaker based on chosen conditions to calculate and select optimum actuation times, allowing for precise control of the circuit-breaker operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional control devices are used to monitor circuit-breaker parameters and issue local instructions, then the device service life is extended and network faults are prevented, but the prediction of optimum actuation times remains inaccurate in complex transmission line applications
Solution Approach 1:
The control device continuously monitors circuit-breaker parameters (stored energy, control voltages, arc extinction medium state, ambient temperature, number of previous actuations, ageing effects, periods between actuations) and network parameters (supply voltage, line voltage, current) to provide feedback for optimizing actuation timing predictions
Solution Approach 2:
The control device performs preliminary analysis of voltage waveforms and circuit-breaker state before actuation to predict and determine the optimum actuation time in advance, allowing synchronization with voltage conditions to minimize surges
2Productivity
If circuit-breaker actuation time is reduced to improve response speed, then productivity increases, but voltage surges and inrush currents increase causing equipment damage
Solution Approach 1:
The control device synchronizes circuit-breaker actuation with the periodic voltage waveform, selecting actuation moments when voltage conditions are favorable (e.g., near zero-crossing or specific phase angles), thereby periodically minimizing harmful surges while maintaining operational efficiency
Solution Approach 2:
The control device changes the actuation timing parameter based on real-time voltage waveform analysis, adjusting the exact moment of closure to optimize between speed and surge minimization for each specific operating condition
3Object-affected harmful factors
If insertion resistances are used to reduce voltage surges, then harmful factors are minimized, but device complexity and overhead costs increase
Solution Approach 1:
The control device replaces physical insertion resistances with an intelligent control system that uses voltage waveform analysis and timing optimization to minimize surges, substituting mechanical/passive components with active electronic control
4Reliability
If comprehensive monitoring of multiple circuit-breaker and network parameters is implemented, then reliability improves, but device complexity increases
Solution Approach 1:
The control device is designed as a multi-functional system that simultaneously monitors multiple circuit-breaker parameters (stored energy, control voltages, arc extinction medium state, ambient temperature, number of previous actuations, ageing effects, periods between actuations) and network parameters (supply voltage, line voltage, current) to provide comprehensive optimization
Data Source
AI summary
A method of controlling a current breaking device in a high-voltage electricity network is disclosed. In one aspect, the method includes, for each phase (A, B, C), obtaining missing supply voltages from an acquired supply voltage, performing healthy phase/faulty phase discrimination, conducting voltage analysis by attempted matching of a model over a signal window, choosing a strategy of simple closing or reclosing of the breaking device as a function of choice conditions, calculating a set of optimum reclosing times for each phase in accordance with the chosen strategy, and selecting an optimum time from the proposed optimum times and closing the phases of the current breaking device.