Current Sensor Circuit for Three-Phase Loss of Phase Detection
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Solution Overview
Problem
Existing three-phase power systems rely on voltage monitoring for loss of phase detection, which fails to detect phase imbalance and distortion, and can lead to microprocessor damage from voltage surges, limiting the ability to calculate power and efficiency effectively.
Innovation Solution
The use of current sensors coupled with a microprocessor to detect loss of phase in three-phase power systems, allowing for amplitude and phase measurements of current, and isolating the microprocessor from high voltage lines to prevent damage from surges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If voltage monitoring is used for loss of phase detection, then the detection method is simple, but phase imbalance and distortion cannot be detected and the microprocessor is vulnerable to voltage surges
Solution Approach 1:
The patent introduces current sensors as an intermediary between the three-phase power source and the microprocessor. These sensors measure current in each phase and provide isolated electrical signals to the microprocessor, preventing direct exposure to high voltage surges while enabling comprehensive phase monitoring including imbalance and distortion detection
2Device complexity
If voltage monitoring focuses on amplitude only, then the measurement is straightforward, but phase imbalance and distortion detection is not possible
Solution Approach 1:
The patent changes the measurement parameter from voltage amplitude only to current characteristics including RMS value, frequency, and phase angle. By analyzing multiple parameters of the current signal rather than just voltage amplitude, the system can detect phase imbalance, distortion, and loss of phase conditions that would be invisible to simple voltage monitoring
Data Source
AI summary
A circuit for detecting loss of phase in three-phase power systems. The circuit includes a current sensor and a microprocessor. The current sensors are coupled to respective phases of a three-phase power source configured to supply power to a load. The microprocessor is coupled to the current sensors to process current measurements and detect loss of phase in the three-phase power source.