| 摘要 |
<p>PURPOSE:To improve the measurement precision of a current transformer by correcting the output signal of an optical magnetic field sensor in accordance with the variance in temperature of a conductor. CONSTITUTION:An optical magnetic field sensor 23 and a temperature sensor 51 are provided on the surface of a conductor 22v piercing a shield case 26, and the sensor 51 measures the surface temperature of the conductor 22v, and an E/O converting part 52 converts this measured value to an optical signal and sends this signal to a light receiving part 53. The sensor 23 sends an optical signal to a light emitting and receiving part 32, and optical signals of the sensor 23 and the light receiving part 53 are inputted to a receiver 56 together by an optical fiber 55. The receiver 56 corrects the output signal of the sensor 23 based on the output signal of the sensor 51 in accordance with the variance in temperature of the conductor.</p> |
