【作者】 李澎；

【导师】 罗承沐；

【作者基本信息】 清华大学 ， 电气工程， 2003， 硕士

【摘要】 随着电力系统向高电压、大容量和数字化方向的发展，必然对电力系统的测量装置提出更高的要求。而传统的电磁式电流互感器具有磁饱和、铁磁谐振及易燃易爆的固有缺点，已很难适应电力系统的发展。因此研究以混合式光电电流互感器为代表的可靠的、新型的高精度电流互感器也成了大势所趋。混合式光电电流互感器的高电位侧电路供电问题是其研制技术的一个关键。论文在本教研组研制的一种新型的220kV混合式光电电流互感器的基础上，对光电电流互感器的供能问题进行深入的研究。本文对国内外关于光电电流互感器的研究状况，特别是光电电流互感器的供能电路的研究现状作了广泛调研。并在调研和本课题组原有技术的基础上，设计、完善并实现了特制线圈供能和激光供能两种混合式光电电流互感器的设计方案和整体结构。论文首先介绍了一种采用特制线圈供能方案的混合式光电电流互感器。该供能方案利用特制线圈的饱和特性，将母线电流大致在10A~720A的电流感应约为8V~40V的电压能量，利用整流桥将交流电变为直流电后，由DC-DC变换器件将其转换为两路不共地的+5V和一组±12V电压供给后端传感头。另外，为了防止在母线大电流情况下，特制线圈感应电压过大导致后端电路烧毁，为电路增加了过电压保护、电压监控保护和能量泄放电路，起到保护器件的作用。为了减小电源的纹波，还专门对电路板进行了优化设计。实验结果表明：该电源部分能够很好地为光电电流互感器的高电位侧电路提供满足要求的约200mW的能量。论文还在深入研究大功率激光光源和光电池特性的基础上，实现了一种利用激光供能的混合式光电电流互感器。其供能部分由低电位侧的大功率激光光源产生激光输出，经光纤将激光能量传输到达高电位侧的光电池，再由光电池进行光功率到电功率的光电变换后，由后级DC-DC将光电池输出的电压转换成满足光电电流互感器传感头部分所需的电压输出。通过研究微功耗DC-DC器件，提出了可同时应用于特制线圈供能和激光供能的高性能DC-DC变换方案。更多还原

【Abstract】 With the development of Power System towards higher voltage, higher capacity and digitization, it is a necessity to put forward a strict requirement for the measurement facilities in Power System. Because the electromagnetic current transformers have such shortcomings as magnetic saturation, ferromagnetic resonance and flammable and explosive traits, it is difficult for them to keep up with the development of Power System. Therefore, it is an inevitable trend to develop new kinds of dependable current transformers for high accuracy measurement such as hybrid optical-electronic current transformer (EOCT). The problem of high potential circuit power supply is the key problem of the research of hybrid optical-electronic current transformer. There are some advanced studies on power supplies schemes for EOCT in this thesis, which based on a new type of EOCT for 220kV busbar researched by the laboratory. The thesis survey the realized power supplies schemes at the nation and aboard widely. Designed and realized two types of power supplies for EOCT, which is power supplies on special coil and power supplies on laser source.Firstly, the thesis introduced a EOCT scheme that supplied on a special coil. It utilized saturation of special coil to transform form 10A~720A current of busbar to 8V~40V voltage of inductions. After switched to direct current, it supplied the loads of sensor by DC-DC transformations, which is included two +5V voltages with respective ground and a group of ±12V voltage. In addition, in order to protect the circuit in the condition of high current in the busbar, the design plan is added by high voltage protect circuit and voltage monitor and control circuit and power discharge circuit. There are also some devices optimized for the circuit to reduce the ripple. The results showed that the circuit of power supplies can supply the power about 200mW for the high potential circuit of optical current transformer well.<WP=5>Secondly, a EOCT device supplied by laser source was realized base on researching the advanced performance of high power laser source and optical battery. After the optical battery transform the light power to electronic power that generate by laser source, the sensor of EOCT can be supplied well by the voltages that transformed form DC-DC devices. Furthermore, a high performance scheme of DC-DC transformations was introduced after the research of low power waste device.更多还原