研究目的
To develop a high precision multi-ratio three-stage current transformer for accurate loss measurements of EHV three-phase shunt reactors with test voltages up to 1100 kV.
研究成果
The high precision multi-ratio three-stage CT demonstrates excellent performance with ratio errors within 3×10-6, making it suitable for loss measurements of EHV three-phase shunt reactors at test voltages up to 1100 kV. The design and construction of the CTs meet the stringent requirements for accuracy and linearity.
研究不足
The magnetic core non-linearity poses challenges in achieving a wide dynamic range of operation with minimal ratio errors. The design must accommodate high voltage requirements up to 1100 kV.
1：Experimental Design and Method Selection:
The design involves a cascaded arrangement of two three-stage CTs (HVCT and LVCT) to achieve multi-ratio functionality. The electronically aided three-stage technique enhances the effective permeability of the magnetic cores to minimize errors.
2：Sample Selection and Data Sources:
The CTs are designed for specific current ratios (500A/1A, 400A/1A, etc.) and tested under burdens up to 1.0 ? at power frequencies of 50 Hz - 60 Hz.
3：0 ? at power frequencies of 50 Hz - 60 Hz.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: High voltage CT (HVCT) and low voltage CT (LVCT) with specific current ratios, amplifiers (A1), and correction windings (NCC).
4：Experimental Procedures and Operational Workflow:
The HVCT is designed with a current ratio of 500A/5A, and the LVCT with ratios of 5A/1A, 4A/1A, etc. The composite CT is tested for ratio errors and linearity.
5：Data Analysis Methods:
Ratio errors and phase errors are measured and analyzed to ensure they are within specified limits (3×10-6).
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