便携式高压开关机械特性测试仪的设计

发布时间：2018-01-19 13:06

本文关键词： 高压断路器机械特性小波分析 TMS320F28335 AD7606　出处：《厦门理工学院》2017年硕士论文　论文类型：学位论文

【摘要】：断路器在电力输配电系统中肩负着重要的使命,其运行的状态直接影响着电力系统的稳定性和供电可靠性。断路器机械特性测试仪能够对断路器的机械特性进行准确的测试,从而降低设备故障率,提高断路器的寿命。本文在综合国内外断路器特性测试方案特点和发展趋势基础上,研制了一款便携式断路器机械特性测试仪,而一般的断路器特性测试仪大多采用采集卡与上位机组合的方式,存在价格昂贵和体积大的缺点,该系统提高了断路器特性测试的便携化与实用性,具有重要的应用价值。本文首先阐述了真空断路器机械特性参数的定义以及对断路器性能的影响,并确定了相关特性参数的测量方法;对比分析了市面上所用传感器的原理与特点,最终选用GSM010GT霍尔电流传感器和TS-0050直线位移传感器分别测试线圈电流信号和动触头行程信号。在此基础上,提出了一种基于DSP的断路器机械特性测试仪的系统设计方案,该方案以TMS320F28335为核心,16位AD7606为采样芯片,测试参量包括合/分闸线圈电流、动触头行程、触头状态,可实现同步采集、特性参数计算、LCD240128液晶显示、SD卡存储。其次,信号在采集过程中存在各种噪声干扰,本文采用小波阈值去噪对信号进行预处理。通过实验对比分析,确定了Db4小波基,分解层次为4,Rigrsure阈值策略的最佳消噪方式,并通过MATLAB验证方法的可行性。然后对合闸线圈电流信号进行特征值的提取,为后期的故障诊断奠定了基础。最后,在实验室搭建实验平台,以ABB VD4真空断路器为测试对象,与GYT-07机械特性测试仪测试数据做对比,验证测试系统的准确性。实验结果表明,线圈电流峰值、合/分闸时间、触头行程、开距、合/分闸速度等机械特性参数的误差均小于3%,测试精度较高,可以满足预期要求。
[Abstract]:Circuit breaker plays an important role in electric power transmission and distribution system. The state of operation directly affects the stability and reliability of power supply. The mechanical characteristic tester of circuit breaker can accurately test the mechanical characteristics of circuit breaker, thus reducing the failure rate of equipment. On the basis of synthesizing the characteristics and developing trend of circuit breakers at home and abroad, a portable tester for mechanical characteristics of circuit breakers is developed in this paper. But the general circuit breaker characteristic test instrument mostly uses the collection card and the host computer combination way, has the expensive and the volume big shortcoming, this system has improved the circuit breaker characteristic test portability and the practicality. In this paper, the definition of mechanical characteristic parameters of vacuum circuit breaker and its influence on the performance of circuit breaker are introduced, and the measurement method of relevant characteristic parameters is determined. The principle and characteristics of the sensors used in the market are compared and analyzed. Finally, GSM010GT Hall current sensor and TS-0050 linear displacement sensor are selected to test the coil current signal and the moving contact stroke signal respectively. This paper presents a system design scheme of the mechanical characteristic tester of circuit breaker based on DSP, which takes TMS320F28335 as the core and 16-bit AD7606 as the sampling chip. The test parameters include the current of closing / closing coil, the stroke of the contact, the state of the contact, the synchronous acquisition, the calculation of the characteristic parameters and the storage of the LCD240128 LCD SD card. There are various kinds of noise interference in the signal acquisition process. Wavelet threshold denoising is used to pre-process the signal. Through experimental comparison and analysis, the Db4 wavelet base is determined, and the decomposition level is 4. The optimal de-noising method of Rigrsure threshold strategy and the feasibility of the method are verified by MATLAB. Then the eigenvalue of the current signal of the closing coil is extracted. Finally, the experimental platform is set up in the laboratory, taking ABB VD4 vacuum circuit breaker as the test object, and compared with the test data of GYT-07 mechanical characteristic tester. The experimental results show that the error of the mechanical characteristic parameters such as the coil current peak value, closing / closing time, contact stroke, opening distance, closing / closing speed and so on are less than 3, and the testing accuracy is high. Can meet the expected requirements.
【学位授予单位】：厦门理工学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM561

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