Study on Grating Light Valve Type Closed-Loop DC Current Transformer and Temperature Correction Method
In order to meet the needs of DC power system energy measurement,power monitoring,control and protection,a closed-loop optical feedback grating light valve(GLV)type DC current sensing scheme based on micropower optical control signal source is pro-posed.A polarization maintaining fiber based all-fiber temperature sensor is integrated to realize the real-time temperature monitoring of GLV probe,and then the system temperature error correction is realized.The prototype development and test(rated current In=500 A)is completed,and the results show that in the range of 10%In-110%In,the fluctuation of system specific difference(RE)is less than±0.2%.In the range of 0-1200 Hz,the harmonic measurement error is less than-0.693%.In the range of-40℃-85℃,the error corrected RE fluctuation range is-0.186%-0.084%.The step response rise time is less than 125 μs.The results show that the system meets the error limit of class 0.2 specified in GB/T 26216.1-2019.
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