共查询到18条相似文献,搜索用时 250 毫秒
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文章从电子式互感器与传统互感器校验方法的不同点出发,研究和介绍了几种主流的电子式互感器校验方法,对数字量输出型和模拟量输出型电子式互感器的校验方法进行了详细介绍。 相似文献
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研究了一种基于低功率铁心线圈的中频双级电子式电流互感器.通过对中频双级电子式电流互感器等效电路的分析,得到了电流误差和相位误差的表达式.为验证双级电子式电流互感器的中频传感性能,构建了基于差值法的中频双级电子式电流互感器校验系统,该系统采用32位DSP浮点芯片TMS320F28335进行数据采集控制和运算处理.实验结果表明,该双级电子式电流互感器在50~1 000Hz频率范围内的误差准确度可达0.05级. 相似文献
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目前,高压计量装置的整体误差校验技术取得了一定的进步,但是在工作中还存在一些不足。为此,本文以高压计量整体误差现场校验技术为课题,引进一种新的装置。在这个过程中,电压互感器、电流互感器等是被作为一个整体参与实验。利用装置输出的高压大电流可以了解到高压电能计量装置的运行状态,达到检验计量误差的目的。 相似文献
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该项目基于"智能化变电站氧化锌避雷器泄漏电流数字分析仪"研制的新型智能变电站电子式互感器数字转换技术。研制全新的同步电压采集装置,具备光纤接口、光信号解码模块,用来接收合并单元发出的光纤信号;增加同步对时装置,由于一次电压经电子式电压互感器采集,再转换到合并单元发出这一流程存在延时问题,为保证电压与电流信号同步,需增加同步对时装置,以保证电压电流信号的同步,从而对智能变电站开展氧化锌避雷器带电测试试验。 相似文献
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<正>一、引言1.什么是电子式互感器电子式互感器是由连接到传输系统和二次转换器的一个或多个电流或电压传感器组成的一种装置,用以传输正比于被测量的量,供给测量仪器、仪表和继电保护或控制装置。在数字接口的情况下,用一台合并单元完成此功能。2.电子式互感器的功能和用途 相似文献
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近十年来,车床主轴回转误差的动态测试在向两个方面发展,一是以模拟量测试系统逐渐发展成为计算机辅助的数字量测试系统,二是从单一的测量径向回转误差的系统发展为同时测量径向、摆角和轴向回转误差的系统。我们研制的车床主轴回转误差计算机辅助测试系统,则既能测量径向、摆角和轴向回转误差,又能绘制各种误差曲线图,进行快速富里哀分析和相关分析,并打印出各种误差值。现将该系统的有关情况作一简要介绍。图1所示为该测量系统框图。测量时,被测车床卡盘上粘有一金属丝,转动周期信号经 相似文献
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测量用互感器及其测试仪器的发展和创新 总被引:3,自引:0,他引:3
详细分析了国内50年代以来,随着生产发展和市场需要,测量用互感器及其测试仪器在提高准确度和性能方面的发展与创新概况。其中主要有:互感器误差补偿的研究和创新,并据此研制各种规格的测量用互感器、带升流器或升压器的高准确度互感器、电流比较仪、双级互感器、比较仪式互感器校验仪及其整体检定装置和数显校验仪等。并展望今后在这方面的发展和创新,如二次为小电流和小电压的互感器以及计算机在互感器及其测试中的应用等。 相似文献
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Brandolini A. Faifer M. Ottoboni R. 《IEEE transactions on instrumentation and measurement》2009,58(5):1345-1353
The calibration of measurement transformers represents a classical task in the practice of electrical measurements. Most commercial instruments that are expressly designed for this purpose found their working principle on a scheme that is based on the idea of Kusters and Moore. Although they can assure very high accuracy, the need to employ a high-performance electromagnetic circuit makes them very expensive and usually not suitable for measurements at frequencies that are higher than 50 or 60 Hz. For this reason, these kinds of instruments cannot be employed for the calibration of the new generation of current and voltage transducers, such as electronic measurement transformers, whose employment is growing in all the applications where wide bandwidth is required. In this paper, a new method for the calibration of electromagnetic voltage and current measurement transformers (VTs and CTs) and electronic voltage and current measurement transformers (EVTs and ECTs) is discussed, and a deep metrological characterization is carried out. The novelty of the proposed method is represented by a completely different approach to the measurement of the ratio and phase errors of the measurement transformers. The method is based on the proper digital signal processing of the signals that are collected at the secondaries of the transformer under test and of a reference transformer when the same signal is applied to their primary. Since no auxiliary electromagnetic circuits are required, this solution can be easily implemented in a simple and cost-effective way. In spite of its simplicity, the tests that are developed on a prototype clearly point out that the proposed system is suitable for the calibration of measurement transformers with precision class up to 0.1 in the frequency range from 50 Hz to 1 kHz. 相似文献
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WANG Xuan LI Yun-ge CAO Xiao-long LIU Ying 《国际设备工程与管理》2006,11(1):17-24
1IntroductionIn a resistance, inductance, and capacitance series circuit, the voltage across the capacitance canbe greater than the source voltage due to the compensative effect of the inductance. This phenome-non, referred to as the capacitive rise, has been fully studied and favorably employed in electricaland electronic systems, but has not been paid much attention in high voltage tests.To guarantee safe and reliable operation, transformers of220 kVand above are recommended in IEC(Interna… 相似文献
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To solve the problems of the existing on-site calibration methods, for instance, the methods need power off, and the standard transformers have large volume, heavy weight and small dynamic range, this paper proposes a high accuracy on-line calibration method for current transformers. By using a clamp-shape Rogowski coil as the standard current transformer, instead of traditional electromagnetic transformer, the volume and weight are reduced greatly, and the power of the line needn’t to be interrupted. The output signal of the clamp-shape Rogowski coil needs to be integrated, and to overcome the problems of analog integrator, which have temperature and zero drift, a high accuracy digital integrator is proposed in the paper to improve the accuracy and stability of the signal processing circuit. Test results indicate that the accuracy of the whole calibration system can reach up to 0.05 accuracy class. The on-line calibration system can calibrate the traditional and electronic current transformers when the line is energized. 相似文献