基于空心线圈互感系数自校验原理的大电流校验系统
发布时间：2019-07-30 18:51
【摘要】：对保护用电流互感器在大电流时的性能进行校验时一般采用含铁芯的电磁式互感器作为标准。但电流较大时,电磁式互感器铁芯体积大、制造困难,且剩磁现象严重,导致其误差变大。为此,提出了一种基于空心线圈互感系数自校验原理的交流大电流校验系统。在小电流时,该系统利用铁芯线圈的输出来校正空心线圈的安装等外界因素可能造成的误差。由于空心线圈的线性度好,校准后的空心线圈可作为大电流校验时的电流标准。空心线圈的输出需要积分还原,采用基于直流负反馈原理的数字积分算法,有效克服了传统模拟积分电路和数字积分的零漂、时漂和直流偏移问题。测试结果表明,该系统在电流500 A~50 kA范围内可达到0.1级的准确度。
[Abstract]:The electromagnetic transformer with iron core is generally used as the standard to verify the performance of the current transformer for protection at high current. However, when the current is large, the core of the electromagnetic transformer is large, the manufacture is difficult, and the remanence phenomenon is serious, which leads to the bigger error. In this paper, an AC high current calibration system based on the principle of mutual inductance self-calibration of hollow coil is proposed. At low current, the system uses the output of iron core coil to correct the error caused by external factors such as the installation of hollow coil. Because of the good linearity of the hollow coil, the calibrated hollow coil can be used as the current standard for high current calibration. The output of hollow coil needs integral reduction. The digital integral algorithm based on DC negative feedback principle is used to overcome the problems of zero drift, time drift and DC offset of traditional analog integral circuit and digital integral. The test results show that the accuracy of the system can reach 0.1 level in the current range of 500A 鈮，
本文编号：2521080
[Abstract]:The electromagnetic transformer with iron core is generally used as the standard to verify the performance of the current transformer for protection at high current. However, when the current is large, the core of the electromagnetic transformer is large, the manufacture is difficult, and the remanence phenomenon is serious, which leads to the bigger error. In this paper, an AC high current calibration system based on the principle of mutual inductance self-calibration of hollow coil is proposed. At low current, the system uses the output of iron core coil to correct the error caused by external factors such as the installation of hollow coil. Because of the good linearity of the hollow coil, the calibrated hollow coil can be used as the current standard for high current calibration. The output of hollow coil needs integral reduction. The digital integral algorithm based on DC negative feedback principle is used to overcome the problems of zero drift, time drift and DC offset of traditional analog integral circuit and digital integral. The test results show that the accuracy of the system can reach 0.1 level in the current range of 500A 鈮，
本文编号：2521080
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