正温度系数聚合物复合材料的制备及限流特性的仿真研究  

Preparation of Polymer Composites with Positive Temperature Coefficient and Simulation Study on Its Current Limiting Characteristics

作　　者：刘荻帆 钟少龙 党智敏[1] LIU Difan;ZHONG Shaolong;DANG Zhimin(State Key Laboratory of Electric Power System,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学电机工程与应用电子技术系电力系统国家重点实验室,北京100084

出　　处：《绝缘材料》2021年第3期24-28,共5页Insulating Materials

基　　金：国家重点研发计划项目(2017YFB0903804);国家电网公司科学技术项目(5455DW170026)。

摘　　要：使用正温度系数(PTC)材料制成的用于限流的PTC电阻器件,可作为防止过流故障的无源元件。通过熔融共混法制备了4个不同体系的聚合物基PTC材料,研究导电填料的质量分数、偶联剂和补充导电填料对于聚合物PTC材料性能的影响;根据聚合物PTC材料的温度-电阻特性和传热方程,对其限流过程进行了仿真研究。实验结果表明:提高导电填料的浓度会导致复合材料的室温电阻率减小,使用硅烷偶联剂改性CB能够提高复合材料的PTC性能,多种填料共同作用能够调节复合材料的PTC性能。仿真结果表明,在一定假设条件下,PTC电阻器作为防止过流故障的无源元件,能够在较短时间内限制电力系统的短路电流。PTC resistance device, which made by positive temperature coefficient(PTC) material, can be used as a passive component to prevent overcurrent fault. In this paper, four kinds of polymer-based PTC materials were prepared by melting blending method, and the effects of conductive filler concentration, coupling agent, and supplementary conductive filler on their properties were studied. According to the temperature-resistance characteristics and heat transfer equation of polymer PTC composite, its current limiting process was simulated. The experimental results show that increasing the concentration of conductive filler will lead to the decrease of the resistivity of composite at room temperature. The PTC properties of the composites can be improved by using silane coupling agent to modify CB and adjusted by the interaction of various fillers. The simulation results show that under certain assumptions, the PTC resis-tor, as a passive component to prevent overcurrent fault, can limit the short-circuit current of power system in a short time.

关 键 词：PTC 复合材料 限流特性 仿真 

分 类 号：TM215[一般工业技术—材料科学与工程]