研究目的
Investigating the design and performance of a new electronic current transformer based on light intensity detection of light emitting diode for power system applications.
研究成果
The proposed electronic current transformer demonstrates advantages of small size, low cost, and strong insulation capability, suitable for protective current transformers with a measuring range up to 3000A, ratio error of 1%, and phase displacement of 60’.
研究不足
The design is more suitable for measuring large currents, with limitations in accurately measuring small currents due to long LED turn-off times.
1：Experimental Design and Method Selection:
The study presents a novel electronic current transformer design using LEDs for light intensity detection proportional to primary current, converted into voltage signals by optical sensors and processed by a DSP.
2：Sample Selection and Data Sources:
A 110kV/3000A prototype was designed and tested to evaluate the transformer's performance.
3：List of Experimental Equipment and Materials:
Includes LEDs, light-to-voltage optical sensors, DSP, optical fibers, and a resistive load.
4：Experimental Procedures and Operational Workflow:
The process involves passing current through resistive load and LEDs, emitting infrared light proportional to current, converting light intensity to voltage, and calculating primary current with DSP.
5：Data Analysis Methods:
The ratio error and phase displacement were measured to assess the prototype's accuracy.
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