CN204086403U - A kind of conductor resistance and resistivity test device thereof - Google Patents
A kind of conductor resistance and resistivity test device thereof Download PDFInfo
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- CN204086403U CN204086403U CN201420489127.XU CN201420489127U CN204086403U CN 204086403 U CN204086403 U CN 204086403U CN 201420489127 U CN201420489127 U CN 201420489127U CN 204086403 U CN204086403 U CN 204086403U
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Abstract
本实用新型公开了一种导体电阻及其电阻率测量装置,其特征在于其包括恒流源(1)、输入输出单元(3),AD采集模块(2)包括单片机(2-1)、取样电阻(2-2)、被测导体(2-3)、取样电阻AD采集模块(2-4)、被测导体AD采集模块(2-5);取样电阻AD采集模块(2-4)包括取样第一分压电阻(2-4-1)、取样第二分压电阻(2-4-2)、取样电阻比较放大器(2-4-3)、取样电阻AD芯片(2-4-4);被测导体AD采集模块(2-5)包括被测第一分压电阻(2-5-1)、被测第二分压电阻(2-5-2)、被测导体比较放大器(2-5-3)、被测导体AD芯片(2-5-4),本实用新型降低劳动强度,重量轻、体积小,单人可完成,功能强大,可自动操作,可准确分析和判断被测导体材质情况。
The utility model discloses a conductor resistance and resistivity measuring device, which is characterized in that it comprises a constant current source (1), an input and output unit (3), an AD acquisition module (2) comprises a single chip microcomputer (2-1), a sampling Resistance (2-2), measured conductor (2-3), sampling resistance AD acquisition module (2-4), measured conductor AD acquisition module (2-5); sampling resistance AD acquisition module (2-4) includes Sampling the first voltage dividing resistor (2-4-1), sampling the second voltage dividing resistor (2-4-2), sampling resistor comparison amplifier (2-4-3), sampling resistor AD chip (2-4-4 ); the measured conductor AD acquisition module (2-5) includes the measured first voltage divider resistor (2-5-1), the measured second voltage divider resistor (2-5-2), the measured conductor comparison amplifier ( 2-5-3), the measured conductor AD chip (2-5-4), the utility model reduces labor intensity, light weight, small size, can be completed by a single person, powerful, automatic operation, accurate analysis and judgment The material of the conductor under test.
Description
技术领域: Technical field:
本实用新型涉及一种导体电阻及其电阻率测量装置,属于电力系统变电检修技术领域。 The utility model relates to a conductor resistance and a resistivity measuring device thereof, belonging to the technical field of power system substation maintenance.
背景技术: Background technique:
在电力设备交接和状态检修中,变压器、开关等导体回路的电阻与电阻率的测量是检测设备状态的有效手段,它可以发现设备是否存在设计和制造等缺陷,以次充好等问题。但目前对导体电阻和电阻率的测量仍采用传统方法即电流电压法进行测量,现场计算,工作量很大,且由于受到表计精度的影响和人员眼睛的误差,导致测量误差较大且工作效率很低。 In the handover and condition maintenance of power equipment, the measurement of the resistance and resistivity of conductor circuits such as transformers and switches is an effective means to detect the status of equipment. It can find out whether there are design and manufacturing defects in the equipment, and problems such as shoddy goods. However, the current measurement of conductor resistance and resistivity still adopts the traditional method, that is, the current-voltage method. The on-site calculation requires a lot of work, and due to the influence of the accuracy of the meter and the error of the personnel's eyes, the measurement error is large and the work is difficult. low efficiency.
实用新型内容: Utility model content:
本实用新型的目的在于克服上述已有技术的不足而提供一种大大降低了劳动强度,极大地降低了测量设备的重量和体积,单人即可完成,功能强大,可进行自动操作,可准确分析和判断变压器、开关导体的材质情况的导体电阻及其电阻率测量装置。 The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and provide a measuring device that greatly reduces the labor intensity and the weight and volume of the measuring equipment, which can be completed by a single person, has powerful functions, can be automatically operated, and can be accurately measured. Conductor resistance and its resistivity measuring device for analyzing and judging the material conditions of transformers and switch conductors.
本实用新型的目的可以通过如下措施来达到:一种导体电阻及其电阻率测量装置,其特征在于其包括恒流源,恒流源连接AD采集模块,AD采集模块连接输入输出单元,AD采集模块包括单片机、取样电阻、被测导体、取样电阻AD采集模块、被测导体AD采集模块;取样电阻AD采集模块包括取样第一分压电阻、取样第二分压电阻、取样电阻比较放大器、取样电阻AD芯片;被测导体AD采集模块包括被测第一分压电阻、被测第二分压电阻、被测导体比较放大器、被测导体AD芯片;取样电阻分别连接恒流源及取样第一分压电阻、取样第二分压电阻,取样第一分压电阻、取样第二分压电阻连接取样电阻比较放大器,取样电阻比较放大器连接取样电阻AD芯片;被测导体分别连接恒流源及被测第一分压电阻、被测第二分压电阻,被测第一分压电阻、被测第二分压电阻连接被测导体比较放大器,被测导体比较放大器连接被测导体AD芯片,取样电阻AD芯片、被测导体AD芯片均分别与单片机连接。 The purpose of this utility model can be achieved through the following measures: a conductor resistance and resistivity measuring device thereof, is characterized in that it comprises a constant current source, the constant current source is connected to an AD acquisition module, the AD acquisition module is connected to an input and output unit, and the AD acquisition The module includes single-chip microcomputer, sampling resistor, measured conductor, sampling resistor AD acquisition module, and measured conductor AD acquisition module; the sampling resistor AD acquisition module includes sampling first voltage dividing resistor, sampling second voltage dividing resistor, sampling resistor comparison amplifier, sampling resistor Resistance AD chip; the measured conductor AD acquisition module includes the measured first voltage divider resistor, the measured second voltage divider resistor, the measured conductor comparison amplifier, and the measured conductor AD chip; the sampling resistor is connected to the constant current source and the sampling first The voltage dividing resistor, the sampling second voltage dividing resistor, the sampling first voltage dividing resistor and the sampling second voltage dividing resistor are connected to the sampling resistor comparison amplifier, and the sampling resistor comparison amplifier is connected to the sampling resistor AD chip; the measured conductor is connected to the constant current source and the measured conductor respectively. The first voltage dividing resistor to be tested, the second voltage dividing resistor to be tested, the first voltage dividing resistor to be tested, and the second voltage dividing resistor to be tested are connected to the comparative amplifier of the conductor under test, and the comparative amplifier of the conductor under test is connected to the AD chip of the conductor under test. The resistance AD chip and the measured conductor AD chip are respectively connected with the single-chip microcomputer.
为了进一步实现本实用新型的目的,所述的输入输出单元包括打印机、存储器、显示单元、按键,单片机分别连接打印机、存储器、显示单元、按键。 In order to further realize the purpose of the utility model, the input and output unit includes a printer, a memory, a display unit, and a key, and the single-chip microcomputer is respectively connected to the printer, the memory, the display unit, and the key.
本实用新型同已有技术相比可产生如下积极效果:本实用新型采用一体化设计,大大降低了劳动强度,极大地降低了测量设备的重量和体积,单人即可完成测量,功能强大,可进行自动操作,可准确分析和判断变压器、开关导体的材质情况状况,更适合现场使用,使复杂繁琐的导体材质试验变得更简单便捷,大大提高了相关工作的效率,从而为及时发现变压器的缺陷、确保设备安全稳定运行奠定坚实的基础。 Compared with the prior art, the utility model can produce the following positive effects: the utility model adopts an integrated design, which greatly reduces the labor intensity, greatly reduces the weight and volume of the measuring equipment, and can be measured by a single person, with powerful functions. It can be operated automatically, and can accurately analyze and judge the material conditions of transformers and switch conductors. It is more suitable for on-site use, making complex and cumbersome conductor material tests easier and more convenient, and greatly improving the efficiency of related work, so as to provide timely detection of transformers. defects, to ensure the safe and stable operation of equipment and lay a solid foundation.
附图说明: Description of drawings:
图1为本实用新型的结构框图; Fig. 1 is a block diagram of the utility model;
图2 为AD采集模块的电路原理图。 Figure 2 is the circuit schematic diagram of the AD acquisition module.
具体实施方式:下面结合附图对本实用新型的最佳实施方式做详细说明: The specific embodiment: below in conjunction with accompanying drawing, the best embodiment of the present utility model is described in detail:
实施例:一种导体电阻及其电阻率测量装置(参见图1-图2),其包括恒流源1、AD采集模块2以及输入输出单元3。AD采集模块2包括单片机2-1、取样电阻2-2、被测导体2-3、取样电阻AD采集模块2-4、被测导体AD采集模块2-5;取样电阻AD采集模块2-4包括取样第一分压电阻2-4-1、取样第二分压电阻2-4-2、取样电阻比较放大器2-4-3、取样电阻AD芯片(ICL7135)2-4-4;被测导体AD采集模块2-5包括被测第一分压电阻2-5-1、被测第二分压电阻2-5-2、被测导体比较放大器2-5-3、被测导体AD芯片(ICL7135)2-5-4。取样电阻2-2分别连接恒流源1及取样第一分压电阻2-4-1、取样第二分压电阻2-4-2,取样第一分压电阻2-4-1、取样第二分压电阻2-4-2连接取样电阻比较放大器2-4-3,取样电阻比较放大器2-4-3连接取样电阻AD芯片(ICL7135)2-4-4;被测导体2-3分别连接恒流源1及被测第一分压电阻2-5-1、被测第二分压电阻2-5-2,被测第一分压电阻2-5-1、被测第二分压电阻2-5-2连接被测导体比较放大器2-5-3,被测导体比较放大器2-5-3连接被测导体AD芯片(ICL7135)2-5-4。输入输出单元3包括热敏打印机3-1、存储器3-2、显示单元3-3、按键3-4,单片机2-1分别连接取样电阻AD芯片(ICL7135)2-4-4、被测导体AD芯片(ICL7135)2-5-4、热敏打印机3-1、存储器3-2、显示单元3-3、按键3-4。 Embodiment: a conductor resistance and resistivity measurement device (see FIGS. 1-2 ), which includes a constant current source 1 , an AD acquisition module 2 and an input and output unit 3 . AD acquisition module 2 includes single-chip microcomputer 2-1, sampling resistance 2-2, measured conductor 2-3, sampling resistance AD acquisition module 2-4, measured conductor AD acquisition module 2-5; sampling resistance AD acquisition module 2-4 Including sampling first voltage dividing resistor 2-4-1, sampling second voltage dividing resistor 2-4-2, sampling resistor comparison amplifier 2-4-3, sampling resistor AD chip (ICL7135) 2-4-4; The conductor AD acquisition module 2-5 includes the measured first voltage dividing resistor 2-5-1, the measured second voltage dividing resistor 2-5-2, the measured conductor comparison amplifier 2-5-3, and the measured conductor AD chip (ICL7135) 2-5-4. The sampling resistor 2-2 is respectively connected to the constant current source 1, the sampling first voltage dividing resistor 2-4-1, the sampling second voltage dividing resistor 2-4-2, the sampling first voltage dividing resistor 2-4-1, the sampling second The two voltage divider resistors 2-4-2 are connected to the sampling resistor comparison amplifier 2-4-3, and the sampling resistor comparison amplifier 2-4-3 is connected to the sampling resistor AD chip (ICL7135) 2-4-4; the measured conductors 2-3 are respectively Connect the constant current source 1, the first voltage dividing resistor 2-5-1 to be tested, the second voltage dividing resistor 2-5-2 to be tested, the first voltage dividing resistor 2-5-1 to be tested, and the second voltage dividing resistor to be tested The piezoresistor 2-5-2 is connected to the tested conductor comparison amplifier 2-5-3, and the tested conductor comparison amplifier 2-5-3 is connected to the tested conductor AD chip (ICL7135) 2-5-4. The input and output unit 3 includes a thermal printer 3-1, a memory 3-2, a display unit 3-3, and a button 3-4. The single-chip microcomputer 2-1 is respectively connected to the sampling resistor AD chip (ICL7135) 2-4-4, and the conductor to be tested. AD chip (ICL7135) 2-5-4, thermal printer 3-1, memory 3-2, display unit 3-3, keys 3-4.
本实用新型采用50A、100A恒流源,恒流源1电流输出稳定可靠,纹波和噪声小,便于单片机控制,电源体积小、散热性能好。设有稳定的取样电阻,接被测导体,取样电阻和被测导体串联在恒流电路中,通过两路AD模块采集两者的电压信号,再通过按键输入被测导体的截面积S(单位mm2)、长度L(单位m)、温度T(单位°C)以及材质(铜或铝)的温度系数,单片机根据上述参数及采集的电压信号值计算被测导体的电阻和电阻率,再把该测量数据存储在掉电不易丢失的存储器中,并通过显示单元进行显示。热敏打印机可打印当前的测量数据和历史测量数据,便于查看和保存结果。 The utility model adopts 50A and 100A constant current sources, and the current output of the constant current source 1 is stable and reliable, the ripple and noise are small, it is convenient for single-chip control, the power supply is small in size, and its heat dissipation performance is good. There is a stable sampling resistor connected to the conductor under test, the sampling resistor and the conductor under test are connected in series in the constant current circuit, the voltage signals of the two are collected through two AD modules, and the cross-sectional area S (unit: mm 2 ), length L (unit m), temperature T (unit °C) and the temperature coefficient of the material (copper or aluminum), the single-chip microcomputer calculates the resistance and resistivity of the measured conductor according to the above parameters and the collected voltage signal value, and then The measured data is stored in a memory that is not easily lost when power is off, and displayed through a display unit. The thermal printer can print the current measurement data and historical measurement data, which is convenient for viewing and saving the results.
如图2所示,恒流源1输出50A或100A电流,流经装置内部稳定的取样电阻2-2和装置外部的被测导体2-3,且两者是串联的关系。取样电阻2-2的电压经过取样第一分压电阻2-4-1和取样第二分压电阻2-4-2分压,实现了电压信号的衰减,取样第二分压电阻2-4-2两端电压信号经过取样电阻比较放大器2-4-3使信号放大到0.65V-1.9V,然后输入给取样电阻AD芯片(ICL7135)2-4-4,同理被测导体2-3的电压经过被测第一分压电阻2-5-1和被测第二分压电阻2-5-2分压,被测第二分压电阻2-5-2两端的电压信号经过被测导体比较放大器2-5-3使信号放大到0.65V-1.9V,然后输入给被测导体AD芯片(ICL7135 )2-5-4,此时单片机(2-1)对取样电阻AD芯片(ICL7135)2-4-4和被测导体AD芯片(ICL7135)2-5-4发出启动信号,取样电阻AD芯片ICL71352-4-4和被测导体AD芯片(ICL7135)2-5-4开始工作,把输入的模拟电压信号转换成数字量化值,然后分别输出给单片机2-1处理,这就是AD采集模块2的工作全过程。 As shown in Figure 2, the constant current source 1 outputs 50A or 100A current, which flows through the stable sampling resistor 2-2 inside the device and the measured conductor 2-3 outside the device, and the two are connected in series. The voltage of the sampling resistor 2-2 is divided by the sampling first voltage dividing resistor 2-4-1 and the sampling second voltage dividing resistor 2-4-2, realizing the attenuation of the voltage signal, and sampling the second voltage dividing resistor 2-4 -2 The voltage signal at both ends passes through the sampling resistor comparison amplifier 2-4-3 to amplify the signal to 0.65V-1.9V, and then input to the sampling resistor AD chip (ICL7135) 2-4-4, the same as the measured conductor 2-3 The voltage is divided by the measured first voltage dividing resistor 2-5-1 and the measured second voltage dividing resistor 2-5-2, and the voltage signal at both ends of the measured second voltage dividing resistor 2-5-2 is measured The conductor comparison amplifier 2-5-3 amplifies the signal to 0.65V-1.9V, and then inputs it to the measured conductor AD chip (ICL7135 ) 2-5-4, at this time the single-chip microcomputer (2-1) pairs the sampling resistor AD chip (ICL7135 )2-4-4 and the tested conductor AD chip (ICL7135) 2-5-4 send a start signal, the sampling resistor AD chip ICL71352-4-4 and the tested conductor AD chip (ICL7135) 2-5-4 start working, The input analog voltage signal is converted into digital quantization values, and then output to the single chip microcomputer 2-1 for processing, which is the whole working process of the AD acquisition module 2.
输入输出单元3包括热敏打印机3-1、存储器3-2、显示单元3-3、按键3-4。显示单元3-3显示要输入的参数、结果等界面信息,按键3-4配合显示单元3-3完成截面积S(单位mm2)、长度L(单位m)、温度T(单位°C)以及材质(铜或铝)的温度系数等参数的输入,单片机2-1根据这些参数和取样电阻AD芯片2-4-4、被测导体AD芯片2-5-4 采集输出的电压信号值计算出导体电阻和20°C时的电阻率,单片机2-1再把结果存储到存储器3-2中,此时操作按键3-4,热敏打印机可打印当前的测量数据和历史测量数据,便于查看和保存结果。存储器3-2是AT24C512,它是掉电不丢失信息的,当测量装置上电后,通过按键3-4和显示模块3-3进入历史测量数据查询界面,可以翻看历史测量数据,此时操作按键3-4,热敏打印机3-1仍然可以打印结果。 The input and output unit 3 includes a thermal printer 3-1, a memory 3-2, a display unit 3-3, and keys 3-4. The display unit 3-3 displays interface information such as parameters and results to be input, and the key 3-4 cooperates with the display unit 3-3 to complete the cross-sectional area S (unit mm 2 ), length L (unit m), temperature T (unit °C) And the input of parameters such as the temperature coefficient of material (copper or aluminum), single-chip microcomputer 2-1 calculates according to the voltage signal value of these parameters and sampling resistance AD chip 2-4-4, measured conductor AD chip 2-5-4 collection output Conductor resistance and the resistivity when 20 DEG C, the single-chip microcomputer 2-1 stores the result in the memory 3-2 again, at this moment, operate the button 3-4, and the thermal printer can print the current measurement data and the history measurement data, convenient View and save results. Memory 3-2 is AT24C512, which does not lose information when the power is off. When the measuring device is powered on, enter the historical measurement data query interface through the key 3-4 and the display module 3-3, and you can view the historical measurement data. At this time Operation button 3-4, thermal printer 3-1 can still print the result.
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