Series Switch Fault Detection via Impedance Analysis
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Solution Overview
Problem
Conventional methods for identifying failed switches in electrical systems are time-consuming, requiring individual testing of each switch, which can result in extended downtime for the entire system until the faulty switch is identified and replaced.
Innovation Solution
A series switch fault detection system that applies a time-varying signal to the electrical system, using sensors and a fault analysis module with a processor and memory to determine the presence of a fault by analyzing measurements and predetermined signal parameters, including capacitors in parallel with each switch to isolate the failed switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual testing of each switch is performed by a technician, then the failed switch can be identified, but the system remains out of service for an extended period of time
Solution Approach 1:
The system performs self-diagnosis by automatically applying test signals and analyzing impedance measurements to identify failed switches without requiring technician intervention. The processor executes algorithms that compare measured impedance values against expected values to autonomously detect and locate switch failures.
Solution Approach 2:
The system continuously monitors impedance values during normal operation and performs preliminary fault detection before complete system failure occurs. By maintaining baseline impedance data and comparing real-time measurements against these baselines, the system can identify developing switch issues and alert operators before critical failures occur.
2Reliability
If multiple series switches are used in the electrical system, then system functionality is improved, but the complexity of identifying a failed switch increases
Solution Approach 1:
The system divides the complex multi-switch circuit into individual measurable segments by applying test signals across specific switch combinations and measuring impedance at various nodes. Each switch's impedance contribution can be isolated and analyzed separately, transforming a complex system-level problem into manageable component-level measurements.
Solution Approach 2:
The system implements continuous feedback by measuring impedance values and comparing them against expected values stored in memory. The processor analyzes deviations between measured and expected impedance to automatically determine which switch has failed, providing immediate feedback that identifies the faulty component without requiring complex manual troubleshooting.
3Measurement precision
If conventional testing methods are used to identify failed switches, then the failed switch can be found, but the process is extremely time consuming
Solution Approach 1:
The system replaces manual mechanical testing procedures with automated electrical impedance measurement and digital signal processing. Instead of physically testing each switch with multimeters or test equipment, the system uses processors to generate test signals and analyze impedance data, dramatically accelerating the fault identification process while maintaining accuracy.
Solution Approach 2:
The system changes the measurement parameter from simple continuity testing to impedance analysis across multiple frequencies and configurations. By measuring impedance magnitude and phase angle at different test frequencies, the system extracts more information from each measurement, enabling faster and more reliable switch failure identification with fewer test iterations.
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 rapid identification of failed switches, reducing downtime by analyzing impedance to isolate the faulty switch, allowing the system to operate with alternative pathways until the primary switch is repaired or replaced.
Implementation Method 1
analyzing the impedance of the electrical system to isolate the failed switch
Implementation Method 2
The capacitors have different values of capacitance to one another
Data Source
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AI summary
A system and method of determining a fault in two or more series switches of an electrical system. The electrical system includes, at least one AC power source, at least one sensor, at least two series switches, and a fault analysis module including a processor and a memory. The method includes applying, by the at least one AC power source, at least one time varying signal to the electrical system. The method further includes receiving, by the fault analysis module, at least one measurement, from the at least one sensor, of the at least one time varying signal, at least one node of the electrical system. The method further includes receiving, by the fault analysis module, at least one predetermined signal parameter and determining, by the fault analysis module, the presence of a fault, based on the at least one measurement and the at least one predetermined signal parameter.