A Technology and Application of Fiber Temperature Sensor for High Voltage Circuit Breaker

随着中国经济的高速发展，电网规模的日益庞大，高压断路器作为电力系统中必不可少的电气设备之一，其工作状态是否正常关乎整个电力系统能否安全高效地运行。为了避免高压断路器因电阻过大或其他故障引起的局部温度超过国家标准而引发停电、火灾等大规模事故，对高压断路器的温度进行实时监测是十分必要的。 针对10KV断路器在线温度监测难的问题，本文提出一种基于反射式强度调制的光纤温度传感系统。本温度传感系统具有非接触、抗电磁干扰能力强、安装便利、性能稳定等优点，此外，本文选用双金属片作为温度敏感元件，价格低廉，适于大规模批量生产。本光纤温度传感系统利用双金属对温度敏感变形的特性，将温度的变化量调制到接收光纤输出...With the rapid development of China’s economy, the scale of the grid is expanding fast. As one of the indispensable electric equipment in power system, high voltage circuit breaker s’ normal working state can influent whether the whole power system can run safely or efficiently. The part-temperature of the high voltage circuit breaker will be higher than the national standards when there is too mu...学位：工学硕士院系专业：物理与机电工程学院_精密仪器及机械学号：1992012115274

A Technique of Automatic Current Sharing for Parallel Switching Power Supply

为了解决大功率开关电源模块并联运行时均流问题,给出了一种应用于并联开关电源的电流自平衡控制方案。介绍了电源并联系统拓扑结构,分析了并联系统模块间环流、功率调节等关键性问题,设计了采用电流自平衡并联技术构成的恒压电源及恒流电源试验。仿真与试验表明,电源模块输出电压、电流波动分别小于0.83%和0.53%,模组之间电流不平衡度小于3.78%,瞬态响应快、稳定性好。In order to solve the problem of the current sharing of parallel high power supplies,a digital current sharing control technique for parallel modularized switching power supply operation was investigated.The structure of the parallel system was presented,and a series of key problems,such as the circumfluence of paralleled system,characteristics of the power regulation were analyzed.The paper also designed some experiments based on automatic current sharing technique for constant voltage power supply and constant current power supply.Through the simulation and experiments,satisfactory dynamic and static performance of the power supply was obtained.The fluctuation of the voltage and current is less than 0.83% and 0.53% respectively,and the difference between the sub modules is less than 3.78%.What's more,the system has fast transient response and good stability

A Double Time Constant Charge and Discharge Modeling and Simulation of Lithium Battery

根据动力锂离子电池充放电特性建立了一种采用快慢电容回路模拟充放电双时间常数动力锂电池的电池模型.详述了模型建立的理论推导过程,经仿真表明,该模型能够准确地反映动力锂电池充电及放电特性以及荷电状态(SOC)的动态变化.According to charging and discharging characteristics of lithium batteries,this paper develops a lithium battery model to simulate the charge and discharge process with fast and slow capacitance double-time constant circuit,and details the theoretical derivation procedure that has developed the model.The simulation result shows that the model can accurately reflect lithium battery charge and discharge characteristics and dynamic changes of the charge state.厦门市科技计划项目(3502Z20123013

Fiber Temperature Sensor for Contact Terminal of High-voltage Circuit Breaker

针对10kV断路器在线温度监测难的问题,提出一种基于反射式强度调制的光纤温度传感器系统,温度敏感元件为双金属片.利用双金属对温度敏感的变形特性,将温度变化量调制到接收光纤输出光通量上,通过对红外接收管输出电压的检测,实现对温度的测量.通过理论推导,证实了测量系统输出电压与温度变化具有线性关系.文中详述了传感器系统的结构,给出了实验装置,进行了30~120℃内的测试实验,实验结果与理论推导吻合,且显示出较优良的特性,其测量误差小于5%,重复性良好.最后给出了在断路器触头的测温安装方法和实验结果.In order to achieve on-line temperature monitoring for the 10 kV circuit breaker,this paper proposes a type of optical fiber temperature sensor systems,which are based on the changing of reflective intensity modulation.A bimetal strip is used as the temperature sensitive element.In this system,the luminous flux of the receiving optical fiber will be changed when the bimetal deforms following temperature changes.Through detecting the voltage of the infrared receiving tube,we could achieve temperature measurements.This measurement system has been demonstrated through theoretical derivation that the output voltage has a linear relationship with the temperature change.The experimental result is in conformity with the theoretical derivation.Moreover,it indicates that this system enjoys a measurement error lower than 5% and high repeatability.福建省科技计划项目(2014H6026