Single-Phase Meter Turn-Over Switch Detection via Capacitive Coupling
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Solution Overview
Problem
Existing single-phase electric meters lack an effective method to detect connection reversals between the phase and neutral, which poses safety risks and potential for energy fraud.
Innovation Solution
Integrate a floating potential target and processing unit in the meter to measure the target voltage between the target and phase conductor, allowing detection of connection states through capacitive coupling, and compare the voltage with a predetermined threshold to identify normal or reversed connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection reversal detection is implemented on single-phase meters, then safety and fraud prevention are improved, but device complexity increases
Solution Approach 1:
A floating potential target is introduced as an intermediary element between the phase conductor and the processing unit. This target serves as a mediator that enables connection reversal detection through capacitive coupling without requiring direct electrical connection to the neutral conductor, thus maintaining safety while enabling detection functionality
Solution Approach 2:
The patent replaces traditional direct electrical connection methods with capacitive coupling. Instead of establishing a direct galvanic connection for detection, the system uses electric field coupling through the floating potential target, substituting a non-contact sensing mechanism that reduces complexity and safety risks
2Measurement precision
If direct measurement methods are used to detect connection reversal, then detection precision is improved, but safety risks increase
Solution Approach 1:
The floating potential target acts as a safety intermediary that isolates the measurement system from direct contact with live conductors. The processing unit measures voltage relative to this floating target through capacitive coupling, achieving precise connection state detection without creating direct electrical pathways that could expose users to hazardous voltages
Solution Approach 2:
The patent converts the potentially harmful capacitive coupling effect into a beneficial detection mechanism. By utilizing the natural capacitive interaction between the floating target and conductors, the system achieves accurate connection reversal detection while maintaining electrical isolation, turning what could be a safety concern into the foundation of the detection principle
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
The solution effectively and inexpensively detects connection reversals by measuring target voltage, reducing safety hazards and preventing energy fraud.
Implementation Method 1
This detection, carried out indirectly by means of capacitive coupling, is very effective.
Data Source
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AI summary
Single-phase electric meter (1) comprising: - a phase conductor (8) intended to be connected to the phase; - an electrical ground (10), which is connected to the phase conductor; - a target (17) with floating potential; - a processing unit (11) arranged to measure a target voltage (Vtarget) between the target and the phase conductor, and to detect, as a function of the target voltage, a state of a phase and neutral connection on the meter (1), the state of the connection being a normal connection or a reverse connection.