三芯对称电力电缆的三相芯线互呈120°角分布,因结构紧凑、敷设成本低,被广泛应用于35 k V以下电缆输配电工程中。三芯对称电力电缆使用共同的屏蔽层和外壳,由于在稳态运行时三相电流之和为0,因而传统的感应式电流测量方法无法用于...三芯对称电力电缆的三相芯线互呈120°角分布,因结构紧凑、敷设成本低,被广泛应用于35 k V以下电缆输配电工程中。三芯对称电力电缆使用共同的屏蔽层和外壳,由于在稳态运行时三相电流之和为0,因而传统的感应式电流测量方法无法用于该类型电力电缆相电流的测量。为解决该问题,提出一种基于磁传感器的三芯对称电力电缆相电流测量方法。通过在三芯对称电力电缆表面沿周向互差120°地安装3个与各相芯线准直的磁传感器,可线性地感知三芯对称电力电缆各相芯线的电流。通过建立物理数学模型,明确磁传感器输出量与三芯对称电力电缆各相芯线电流之间的量值关系。数值仿真计算验证所建立模型以及所提出测量方法准确实用。展开更多
An accurate detection of the effective values of electric voltage and current from high frequency power generators is a precondition for the development of smart electrotomes. In this light, an energy detection system...An accurate detection of the effective values of electric voltage and current from high frequency power generators is a precondition for the development of smart electrotomes. In this light, an energy detection system based on personal computer (PC) is developed hereby. It senses voltage and current in isolation from generators with transformers, and then the measured values are amplified, filtered, transformed into single-ended signals and converted to RMS. The detected signals are transformed into digital signals through Data Acquisition Card (DAQ) and the data are processed with quadratic fit in Labview. Finally, the controller completes constant power output. The experiment results indicate that the energy detection system can measure the output parameters precisely and the controller can achieve constant power control.展开更多
文摘三芯对称电力电缆的三相芯线互呈120°角分布,因结构紧凑、敷设成本低,被广泛应用于35 k V以下电缆输配电工程中。三芯对称电力电缆使用共同的屏蔽层和外壳,由于在稳态运行时三相电流之和为0,因而传统的感应式电流测量方法无法用于该类型电力电缆相电流的测量。为解决该问题,提出一种基于磁传感器的三芯对称电力电缆相电流测量方法。通过在三芯对称电力电缆表面沿周向互差120°地安装3个与各相芯线准直的磁传感器,可线性地感知三芯对称电力电缆各相芯线的电流。通过建立物理数学模型,明确磁传感器输出量与三芯对称电力电缆各相芯线电流之间的量值关系。数值仿真计算验证所建立模型以及所提出测量方法准确实用。
文摘An accurate detection of the effective values of electric voltage and current from high frequency power generators is a precondition for the development of smart electrotomes. In this light, an energy detection system based on personal computer (PC) is developed hereby. It senses voltage and current in isolation from generators with transformers, and then the measured values are amplified, filtered, transformed into single-ended signals and converted to RMS. The detected signals are transformed into digital signals through Data Acquisition Card (DAQ) and the data are processed with quadratic fit in Labview. Finally, the controller completes constant power output. The experiment results indicate that the energy detection system can measure the output parameters precisely and the controller can achieve constant power control.
