Electrical Fault Detection Using Synchronized Measurement Modules
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Solution Overview
Problem
Existing electrical fault detection systems in overhead electricity transmission networks are complex, imprecise, and inefficient, particularly in three-phase networks with compensated neutral, due to significant information processing and exchange, which leads to consumption issues and failure in detecting low fault currents.
Innovation Solution
The system employs measurement modules with synchronized clocks to determine a fault detection instant, allowing for precise identification of measured values at the same instant, reducing information processing and exchange by only acquiring values within predefined intervals, and using secondary clocks for further synchronization and calculation of instants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If simultaneous transmission of synchronization message is used to coordinate measurement modules, then current values can be summed at the same instant, but the system complexity and information processing load increase significantly
Solution Approach 1:
The system pre-establishes a synchronized time reference across all measurement modules using GPS or other time synchronization signals before measurements are taken. This preliminary time synchronization allows each module to independently timestamp its measurements without requiring complex real-time communication coordination during the measurement process, thereby reducing information processing load while maintaining measurement synchronization.
Solution Approach 2:
A central acquisition unit acts as an intermediary that collects timestamped measurements from distributed measurement modules. Instead of requiring complex peer-to-peer communication and coordination between modules, the acquisition unit centralizes the synchronization function by receiving measurements with timestamps and processing them according to the pre-established time reference, simplifying the overall system architecture.
2Reliability
If all measured values are transmitted and processed, then complete information is available for fault detection, but the quantity of information processed and exchanged increases significantly
Solution Approach 1:
The system extracts and transmits only the essential elements needed for fault detection: timestamped measurement values and their corresponding time stamps. By filtering out redundant information and focusing only on the critical data elements (measurements with precise timing), the system maintains complete fault detection capability while significantly reducing the quantity of information that must be processed and exchanged.
Solution Approach 2:
The system changes the parameter of information representation by using precise time stamps instead of continuous data streams. By sampling measurements at specific time intervals and transmitting only these discrete timestamped values rather than continuous analog signals or complete waveforms, the system reduces information volume while preserving the temporal relationships necessary for fault detection.
3Device complexity
If measurement modules operate with independent clocks, then system simplicity is maintained, but the precision of simultaneous measurement across modules deteriorates
Solution Approach 1:
The system performs preliminary time synchronization by providing a common time reference signal to all measurement modules before they begin independent operation. This pre-synchronization allows each module to operate with its own clock while maintaining a unified time reference, achieving both operational simplicity and measurement precision.
Solution Approach 2:
The system implements feedback through time stamping, where each measurement is tagged with a precise time reference. This feedback mechanism allows the acquisition unit to correlate measurements from different modules by comparing their time stamps, thereby achieving precise simultaneity verification without requiring continuous active synchronization during operation.
4Measurement precision
If sampling frequency is increased to capture fault instants, then measurement accuracy improves, but the amount of data to be processed and transmitted increases
Solution Approach 1:
The system extracts only the critical measurements taken at or near the fault instant, identified through the time stamping mechanism. By selecting and transmitting only these specific high-value data points rather than all sampled data, the system maintains high measurement precision for fault detection while minimizing the volume of data that must be processed and transmitted.
Solution Approach 2:
The system uses a moderate sampling frequency that is sufficient to capture fault events but not excessively high. Combined with the time stamping approach, this partial action strategy captures all necessary fault information at an appropriate resolution without the diminishing returns and increased data burden of ultra-high sampling rates.
Data Source
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AI summary
The invention relates to a system for detecting an electrical fault in an electrical installation comprising several electrical conductors (14A, 14B, 14C), the system comprising: - at least two measuring modules (16A, 16B, 16C), each measuring module (16A, 16B, 16C) comprising first radio communication means (24A, 26A, 24B, 26B, 24C, 26C), a sensor (22A, 22B, 22C) for measuring each electrical quantity associated with a corresponding electrical conductor (14A, 14B, 14C), and a first clock (34A, 34B, 34C) defined by a first initial instant and a first clock frequency, each measured value being specific to be associated with a first measurement instant, determined with respect to the first initial instant and as a function of the first frequency, - an acquisition unit (18), comprising second means radioelectric (40, 42) adapted to communicate with the first radioelectric means of communication (24A, 26A, 24B, 26B, 24C,26C).,