【作者】 高迎霞；

【导师】 郑绳楦； 毕卫红；

【作者基本信息】 燕山大学 ， 电路与系统， 2006， 硕士

【摘要】 电子式电流互感器ECT(Electronic current transducer)是一种新型的电力设备,由于传感方式不同于传统的电流互感器CT(Current transducer),ECT有着传统CT无可比拟的优点,使得它在未来的电力系统中有着广阔的应用前景。电子式电流互感器分为有源、无源两种类型,有源式电子电流互感器采用了先进的光电子技术和现代集成电子技术,发挥了高可靠、高精度、高稳定等特点,是目前最具实用前景的研究方向之一。但由于采用光纤传输使高低压绝缘隔离,高低压之间没有任何电磁联系,因此如何向有源ECT高压侧电路供电就成为一项关键的技术,是研制中的技术难点。本文对电子式电流互感器高压侧电路及电源进行研究,重点研究高压侧电源。文中首先对电子式电流互感器高压侧电路进行研究和设计;其次针对目前有源式电子电流互感器高压侧电路供电的要求,对现有供电方案进行研究分析,在此基础上提出一种交直流结合的供电方案。此方案采用母线电流取能和储能电源相结合供电,两者取长补短,以解决铁芯处于饱和状态时,自动重合闸过程电源启动速度慢的问题,及在母线电流很小或断电的情况下电流互感器的死区问题;然后对交直流结合供能方案进行具体设计,母线电流取能部分采用特殊材料制作磁感应线圈,利用线圈的饱和特性限制饱和大电流,同时还设计直流稳压变换电路和大电流保护电路。储能电源部分采用锂离子电池作为储能电池,为了给锂离子电池充电,需设计专门充电管理电路,严格控制电池的充放电和进行温度监控。最后对交直流结合供电方案进行实验验证,用实验确定该供电方案小CT母线电流的启动电流和锂离子电池的启停位置,解决互感器死区问题。更多还原

【Abstract】 Electric current transducer is new-style in electronic power equipments. Because the mode of sensor is differ from traditional current transformer, ECT has more advantages than traditional CT, which will make it applied widely in the future electricity system.There are active and passive about Electronic Current Transformer. The active electronic current transformer adopts the sophisticated integrated optoelectronic technology and modern electronic technology. It has played a high-reliability, high-precision and stabilization. It is one of the most practical in future research directions. However, since high-fiber makes transmission insulated between the high-voltage and low-voltage, there isn’t any electromagnetic contact between the high-voltage and low-voltage. So, how to supply power for high-voltage circuits become pivotal technology, which is difficulty in research technology.In this paper, the high voltage circuit and power supply for electronic current transformer are studied, the emphasis is power supply. First, the high-voltage circuits of current transformer are studied and designed. Second, several kind of power supply methods which exist at present have been carried on the analysis, aiming at the request of high-voltage power for active electronic current transformer, proposing one kind of improved power supply method in the basis. This method which adopts the mode of the link of the Magnetic induction coil and battery Stored energy supplies power. They make up for one’s deficiency by learning from others’strong points.When the iron core is at the saturated condition,in the automatic switch process, the question which the speed of power works slowly is solved, and the dead zone of the current transducer is solved in the small female current or in the power failure situation. Third, the power supply method is designed, The Magnetic induction coil ismade of special material, whose saturation restricts large current, at the same time power converter circuit and large current protection circuit are designed. Li-ion battery is used as storage batteries about stored energy power. To charge for Li-ion battery, a special management IC of charging is designed, which strictly controls the charging and discharging and temperature monitoring for battery. Finally, the experiments about power supply are performed. the starting current about the power induced from line and the location of starting and stopping about Li-ion battery are confirmed by the experiment, in order to resolve the dead zone of the transducer.更多还原