有源型光学电流互感器研究进展

介绍了电子式电流互感器的分类,有源型电子电流互感器基本工作原理,回顾了近年来关于有源型电子式电流互感器研究的发展状况,着重介绍了使用Rogowski线圈进行采样的基本原理、利用悬浮电源、激光或太阳能电池的供电技术以及信号处理技术方面的研究进展。     

有源电子式电流互感器高压侧电源的研究

电流互感器是电力系统中的重要设备,介绍一种适用于有源电子式电流互感器的悬浮式直流电源的设计原理。提出一种用补偿线圈和充电电池相结合的方法对母线电流取能方式进行改进的新方案,使电源在更宽的一次侧电流动态范围内满足电子式电流互感器对电源的要求。实验结果表明,该电源能够满足高压侧电子电路的供能要求。该方法是目前解决有源电子电流互感器高压侧电源问题的有效方法之一。     

电子元件、组件

TM42007060935基于Rogowski线圈的电流互感器信号处理中积分算法的研究/高迎霞,毕卫红,刘丰,包宇(燕山大学信息科学与工程学院)//电测与仪表.―2006,43(11).―1～5.基于Rogowski线圈的电流互感器与传统电流互感器相比具有广泛应用前景,备受关注。但Rogowski线圈的自身特性以及后续信号处理电路一直影响着电子电流互感器的测量精度,该文对Rogowski线圈的积分算法进行了研究,分别叙述了模拟和数字两种算法及其实现形式,并对其性能进行了分析。从中得到了一些有益结论,可进一步改善积分环节,提高电子电流互感器的测量精度。图10表0参15TM40…     

电子式电流互感器的高压侧供电电源设计

电子式电流互感器的高压侧电路供电问题是其研制的一个难点。设计了一种用于电子电流互感器高压侧供电的激光电源,实验表明该电源性能良好,可作为高压侧电子线路的供能装置。     

基于光纤传输的有源光电电流互感器总体设计

提出了一种新型的有源光电电流互感器的总体设计方案,详细介绍了高压侧和低压侧数据信号处理的实现方法,高压侧到低压侧数据信号光线路传输的实现方法及高压侧激光供能的实现方法.给出了基于该方案的试验样机的测试结果.测试结果表明:按照该方案研制的试验样机能够满足使用要求.     

Rogowski线圈互感系数的计算方法

Rogowski线圈应用于电子式电流互感器的传感头,根据Rogowski线圈物理模型对其互感系数进行数学分析与计算,说明影响互感系数的线圈结构因素。     

一种新型光电式电流互感器的设计

提出了一种新型有源型光电式电流互感器(OECT)的设计方案,采用了光电以及微机技术,集电流、电压、有功功率和无功功率等电网运行参量的测量于一体,同时还提供继电保护设备接口以及与远程控制计算机的数据通信接口.     

电能计量系统发展简史

基于互感器、电能表和二次接口等方面回顾了电能计量装置的发展历程和原理,对21世纪现代电能计量装置的发展趋势进行了展望,指出数字化、智能化、标准化、系统化和网络化是现代电能计量系统发展的必然趋势。另外,还介绍了几个新型互感器(Rogowski光电式电流互感器、法拉第磁光效应互感器和光学电压互感器),特殊功用的新型电能表(单相电子式复费率电能表和三相预付费电表)和常用电能计量芯片。     

电气测量技术及仪器

TM930 2003061734外积分式Rogowski线圈电流璐变校正方法的研究/袁伟群,栗保明(南京理工大学)11南京航空航天大学学报一2003,27(4)一345一348该文探讨外积分式Rogowski线圈测星瞬态单脉冲强电流时积分电路的时间常数对输出电压的影响,指出引起积分电路翰出电压波形崎变的原因,提出电压波形崎变的校正方法.电压波形畸变的校正方法适用于外积分式Rogowski线圈积分电路的时间常数低于10倍脉冲强电流脉宽的情况.采用波形校正方法可以大幅减少脉冲强度电流的测量误差,扩大了Rogowski线圈在脉冲强流侧量中的应用范围.图4参4(木)测介电常数的方…     

混合光电电流互感器的反馈式激光供能

研究以混合式光电电流互感器为代表的可靠、新型的高精度电流互感器已为大势所趋,其研制技术的关键是电流互感器的供电问题。设计了光电池电压自举电路,以保证光电池始终工作在效率最高点附近,解决了光电池的输出电功率随负载变化而变化的问题。并利用电池智能监控器对光电池输出的电压、电流及互感器的工作电压进行监控,通过电-光转换和光-电转换模块来解决高低压侧之间的数据传输问题,减少了传输过程中外界对数据的干扰。实验研究表明该供能系统能够在负载变化的情况下保证输出电压的稳定。     

自制电流测量环测量与标定方法的研究

为准确测量功率纳秒脉冲驱动装置中的脉冲大电流,设计了一个电流测量环,阐明了其设计原理。对电流测量环的测量进行了阐述,针对自制电流测量的标定问题开展了研究,提出了用美国电流测量环作为标准环,来进行一一比对测量的方法。将自制电流测量环的测量数据用该文给出的公式来换算出电流测量环的测量偏差,通过与标准环数据的比对,来及时发现量值失准的电流测量环,从而完成了自制电流测量环的标定。通过实验验证,取得了令人满意的效果。     

几种非侵入式电流测量技术

电流测量是工业生产和科学研究中经常进行的项目.与传统的欧姆定律方法相比,非侵入式电流测量技术具有与被测电路电隔离、精度高、易于实现自动化等优点,具有广阔的应用前景.在调查非侵入式电流测量技术应用现状的基础上,总结了目前常用的几种测量方法的原理,包括电流互感器、Rogowski线圈、霍尔电流传感器、光学电流传感器、磁阻电流传感器等,介绍了各自的特点,并对电流传感器的发展趋势做了展望.     

Micro PCB Rogowski coil for current monitoring and protection of high voltage power modules

We have developed a printed circuit board Rogowski coil for monitoring of current and protection of high-voltage power modules and packages. It is small, thin, and inexpensive current sensor and is almost the ideal Rogowski coil because of its fishbone pattern. For noise reduction under high-voltage/-current conditions in a module, shield layers and coaxial connector are employed. In addition, a new, fast simulation tool was developed to optimize the main coil pattern for realization of arbitrary printed circuit board geometry in specific, limited spaces.     

罗氏线圈电子式电流互感器的设计

介绍了一种基于罗氏线圈的电子式电流互感器的设计.在考虑引起罗氏线圈计量误差的各种原因的基础上,综合应用多种减小罗氏线圈计量误差的方法,绕制了一种罗氏线圈.并利用该线圈设计出由模拟积分器构成的电流互感器和采用DSP芯片的数字输出电子式电流互感器,经测试,其测量精度为0.5级.     

An alternative low-cost current-sensing scheme for high-currentpower electronics circuits

A lightweight and low-cost current sensor for application in high-current, high-frequency inverters and power converters is described. The current sensor consists of three elements. The first is a Rogowski coil, also known as a Maxwell Worm, which is a nonmagnetic toroid wound like an inductor. The output voltage at the open terminals of this winding is proportional to the time derivative of the current flowing in a conductor passing through the toroid. The second element of the sensor is an integrator which has as its input the output of the Rogowski coil. The third element of the sensor is a circuit to reset the integrator to zero whenever the current through the Rogowski coil is known to be zero. Resetting the integrator prevents the error generated by the integration of offset voltages and biases, which cannot be avoided in practical integrators, from becoming unacceptably large. For the case of a semiconductor switch, the current through the switch is known to be zero when the switch is gated off. The results presented using this current sensing scheme demonstrate its feasibility for use in high-power motor drive applications. The sensor has its largest advantage for measuring currents with peak values greater than 50 A and with switching frequencies greater than 1 kHz     

Rogowski线圈的FBG电流传感器研究

电流是电力设备进行计量、监控和保护的重要参量,对其准确测量是电力系统安全、稳定、可靠和经济运行的保证。研制了一种Rogowski线圈、叠堆压电陶瓷和光纤Bragg光栅组合成的测量大电流的电流传感器。利用Rogowski线圈把高压侧大电流线性地转换为低电压,输出电压加在叠堆压电陶瓷上,由逆压电效应,叠堆压电陶瓷伸缩带动光纤Bragg光栅伸缩,将叠堆压电陶瓷的应变线性转换为光纤Bragg光栅的中心反射波长的移位,增加温补光栅消除环境温度的影响,通过测量光纤Bragg光栅中心反射波长的移位来测量电流的大小。测试结果表明,该电流传感器的灵敏度为0.071 8pm/A,非线性误差为3.47%FS,滞后误差为4.17%FS,重复性误差为4.17%FS。     

Clamp type built-in current sensor using PCB in high-voltage power modules

High reliability is required for power modules because they are increasingly demanded as key devices in an energy-saving society. However, commercially available current sensors like current transformers and Rogowski coils are still of large size. Therefore, it is impossible to measure the current in small parts. In addition, long wiring with large sensors reduces the performance of power modules. In previous studies, we proposed a current sensor of PCB Rogowski coil with a fishbone pattern. The sensor is sufficiently small and thin with high accuracy for power module application. The PCB current sensor can be used as a built-in current sensor in power modules from the viewpoint of size. However, the sensor requires further improvement to be attached to bonding wire from a usability perspective.We propose a new pattern for the clamp-type PCB sensor and fabricate the PCB sensor as a built-in sensor in a power module. With the new pattern, it is possible to move and widen the gap for clamping. The signal error is small even though the sensor is inclinedly attached to the bonding wire. The accuracy is confirmed by a comparison between the clamp-type PCB sensor in the module and a commercially available current sensor outside the module. The clamp-type PCB sensor can be applied for intelligent power modules as well as current measurement for power electronic converters.     

Envelop tracking based embedded current measurement for monitoring of IGBT and power converter system

Health monitoring of the power conversion system is very important. Therefore, we developed a new method for measuring IGBT currents and reproducing average load current to monitor IGBTs. This method was successfully tested on an experimental setup which showed that the tiny PCB sensors can be integrated into intelligent power modules. We proposed an inexpensive analogue circuit which is suitable for capturing current information from a tiny PCB Rogowski coil. The sensors and corresponding circuit can be embedded into an Intelligent Power Module. The method was named “Envelop tracking” as it simultaneously measures the currents of the high and low side switches of a power converter and reproduces the upper and lower edges of the load current which can be averaged by further digital processing.