技术领域technical field
本实用新型涉及输电检测技术领域，具体涉及一种便携式输电线路外绝缘监测装置。The utility model relates to the technical field of power transmission detection, in particular to a portable power transmission line external insulation monitoring device.
背景技术Background technique
绝缘子是输电线路外绝缘的主要组成部件。由于长期暴露在大气中，空气中存在的固体悬浮微粒会沉积在绝缘子的表面，日积月累沉积了一层污秽物，遇到合适的气候条件（如毛毛雨、大雾、凝露等）时，绝缘子表面的污秽层受潮形成薄薄的导电层，使绝缘子的外绝缘水平下降，导致在额定运行电压下发生污秽闪络（以下简称污闪）。此外，线路覆冰等输电线路外绝缘故障也会导致输电线路绝缘失效，进而产生短路事故，严重威胁着电网安全、稳定运行。输电线路外绝缘故障不仅影响范围广、持续时间长，而且造成的经济损失十分严重。据统计，虽然输电线路外绝缘故障不及雷害事故发生频繁，但是所引起的事故损失却是雷害事故的十倍。Insulators are the main components of the external insulation of transmission lines. Due to long-term exposure to the atmosphere, solid suspended particles in the air will deposit on the surface of the insulator, accumulating a layer of dirt, and when encountering suitable climatic conditions (such as drizzle, fog, condensation, etc.), The pollution layer of the insulator is damp to form a thin conductive layer, which reduces the external insulation level of the insulator, resulting in pollution flashover (hereinafter referred to as pollution flashover) under the rated operating voltage. In addition, external insulation failures of transmission lines such as line icing will also lead to insulation failure of transmission lines, resulting in short-circuit accidents, which seriously threaten the safe and stable operation of the power grid. External insulation faults of transmission lines not only affect a wide range and last for a long time, but also cause serious economic losses. According to statistics, although the external insulation faults of transmission lines are less frequent than lightning accidents, the accident losses caused by them are ten times that of lightning accidents.
随着经济的发展，电网容量和电压等级相应提升、环境污染日渐加剧，污秽闪络等输电线路外绝缘故障的发生率也日益增大。我国的输电线路在1971－1980年间共发生污闪事故1126次，1981－1990年则达1907次。90年代后跨地区、跨省市的大面积污闪事故更为突出，1990年的华北地区、1996－1997年的华东地区、2001年的辽宁、华北和河南等地都发生了大面积污闪事故。污闪事故造成的直接电能损失以及国民经济损失都是十分惊人的。例如，1986年兰州电网的“3.16”污闪，导致14条线路41处发生污闪，5条线路的9处架空地线断线，2条线路的3处导线断线，全网开关跳闸106台次，5座220kV变电站和28座110kV变电站全部停电，1座220kv变电站部分停电，兰州电网与西北主网解列长达5小时，电厂与系统解列两次。在我国南方地区，由于线路覆冰所引起的输电线路外绝缘故障也时有发生。With the development of the economy, the capacity and voltage level of the power grid have increased accordingly, environmental pollution has become increasingly serious, and the incidence of external insulation faults such as pollution flashovers on transmission lines has also increased. During 1971-1980, there were 1126 pollution flashover accidents on transmission lines in my country, and 1907 times during 1981-1990. After the 1990s, large-scale pollution flashover accidents across regions and provinces became more prominent. Large-scale pollution flashovers occurred in North China in 1990, East China in 1996-1997, and Liaoning, North China, and Henan in 2001. ACCIDENT. The direct power loss and national economic loss caused by pollution flashover accidents are very astonishing. For example, the "3.16" pollution flashover in Lanzhou Power Grid in 1986 resulted in 41 pollution flashovers in 14 lines, 9 overhead ground wires in 5 lines were disconnected, 3 conductors in 2 lines were disconnected, and 106 switches in the entire network were tripped. In the number of units, five 220kV substations and 28 110kV substations were completely out of power, and one 220kV substation was partially out of power. Lanzhou Power Grid was decoupled from the Northwest Main Grid for 5 hours, and the power plant and the system were decoupled twice. In southern my country, external insulation faults of transmission lines caused by icing of lines also occur from time to time.
国内外广泛采用预防性措施防污闪，例如采用大爬距耐污绝缘子、增加绝缘子串的片数、涂憎水性涂料和停电冲洗等。采取上述预防性措施后，确实降低了输电线路外绝缘故障的发生率，但是绝缘子的实际运行条件非常复杂，外绝缘故障发生与否由绝缘子的表面积污或覆冰情况、潮湿(气象条件)和运行电压三因素共同决定，外绝缘故障并未从电网中根本消除，特别是20世纪90年代以来我国电网较大规模跨区域性的污闪事故发生得日益频繁。因此，深入开展输电线路外绝缘故障监测技术发难的研究，最大限度地抑制外绝缘故障的发生，具有重要的实际意义。Preventive measures to prevent pollution flashover are widely used at home and abroad, such as the use of large creepage distance pollution-resistant insulators, increasing the number of insulator strings, coating hydrophobic coatings and power failure washing, etc. After taking the above preventive measures, the incidence of external insulation faults of transmission lines has indeed been reduced. However, the actual operating conditions of insulators are very complicated. The three factors of operating voltage are jointly determined, and external insulation faults have not been completely eliminated from the power grid. Especially since the 1990s, large-scale cross-regional pollution flashover accidents in my country's power grid have become increasingly frequent. Therefore, it is of great practical significance to conduct in-depth research on the monitoring technology of external insulation faults of transmission lines and to suppress the occurrence of external insulation faults to the greatest extent.
实用新型内容Utility model content
为了克服上述技术缺点，本实用新型提供了一种新颖的便携式输电线路外绝缘监测装置。In order to overcome the above-mentioned technical shortcomings, the utility model provides a novel portable external insulation monitoring device for transmission lines.
为达到上述目的，本实用新型采用的技术方案提供一种便携式输电线路外绝缘监测装置，包括聚焦超声传感器1、阻抗匹配器2、信号放大器3、补偿放大器4、带通滤波器5、A/D转换单元6、微处理器7、通信接口8、LCD显示单元9和数据存储单元10，聚焦超声传感器1、阻抗匹配器2、信号放大器3、补偿放大器4、带通滤波器5和A/D转换单元6依次连接，微处理器7和补偿放大器4、A/D转换单元6、通信接口8、LCD显示单元9、数据存储单元10分别连接。In order to achieve the above purpose, the technical solution adopted by the utility model provides a portable power transmission line external insulation monitoring device, including a focused ultrasonic sensor 1, an impedance matching device 2, a signal amplifier 3, a compensation amplifier 4, a bandpass filter 5, an A/ D conversion unit 6, microprocessor 7, communication interface 8, LCD display unit 9 and data storage unit 10, focused ultrasonic sensor 1, impedance matching device 2, signal amplifier 3, compensation amplifier 4, bandpass filter 5 and A/ The D conversion unit 6 is connected sequentially, and the microprocessor 7 is connected with the compensation amplifier 4, the A/D conversion unit 6, the communication interface 8, the LCD display unit 9, and the data storage unit 10 respectively.
而且，聚焦超声传感器1输出输电线路放电所产生超声波信号相应的电信号，经过阻抗匹配器2后依次输出到信号放大器3、补偿放大器4，补偿放大器4输出补偿放大结果到带通滤波器5，带通滤波器5的输出送入A/D转换单元6，A/D转换单元6的输出送入微处理器7，微处理器7输出输电线路的放电强度到LCD显示单元9。Moreover, the focused ultrasonic sensor 1 outputs the electrical signal corresponding to the ultrasonic signal generated by the discharge of the power transmission line, which is output to the signal amplifier 3 and the compensation amplifier 4 in sequence after passing through the impedance matching device 2, and the compensation amplifier 4 outputs the compensation amplification result to the band-pass filter 5, The output of the band-pass filter 5 is sent to the A/D conversion unit 6, and the output of the A/D conversion unit 6 is sent to the microprocessor 7, and the microprocessor 7 outputs the discharge intensity of the transmission line to the LCD display unit 9.
而且，微处理器7输出输电线路的放电强度经通信接口8送入外接的PC机。Moreover, the microprocessor 7 outputs the discharge intensity of the transmission line and sends it to an external PC through the communication interface 8 .
而且，微处理器7输出输电线路的放电强度到数据存储单元10。Also, the microprocessor 7 outputs the discharge intensity of the power transmission line to the data storage unit 10 .
而且，所述聚焦超声传感器1包括超声波传感器和抛物面天线，超声波传感器安装在抛物面天线的焦点处。Moreover, the focused ultrasonic sensor 1 includes an ultrasonic sensor and a parabolic antenna, and the ultrasonic sensor is installed at the focal point of the parabolic antenna.
而且，阻抗匹配器2采用场效应管FS70SM-2，信号放大器3采用仪表放大器AD620，补偿放大器4采用精密运算放大器OPA2277，带通滤波器5采用滤波器芯片MAX275，A/D转换电路6包括A/D转换芯片ADS1286U和放大器芯片PGA309，微处理器7采用TMS320LF2407 芯片，通信接口8采用SN65HVD1050DR芯片，LCD显示单元9采用液晶触摸屏TFT3224RS-3.5，数据存储单元10采用CF卡。Moreover, the impedance matching device 2 uses a field effect transistor FS70SM-2, the signal amplifier 3 uses an instrument amplifier AD620, the compensation amplifier 4 uses a precision operational amplifier OPA2277, the band-pass filter 5 uses a filter chip MAX275, and the A/D conversion circuit 6 includes A /D conversion chip ADS1286U and amplifier chip PGA309, microprocessor 7 adopts TMS320LF2407 chip, communication interface 8 adopts SN65HVD1050DR chip, LCD display unit 9 adopts liquid crystal touch screen TFT3224RS-3.5, and data storage unit 10 adopts CF card.
本实用新型提供的装置紧密结合电力系统的实际，可有效监测输电线路绝缘子放电情况或外绝缘强度的变化，有助于运行维护部门及时了解和掌握绝缘子的运行状态， 一旦发现输电线路外绝缘强度劣化，能及时发出预警信号，使得相关人员及时采取应对措施，避免输电线路外绝缘故障的发生与发展，保证电力系统的安全与稳定运行。本实用新型提供的装置特别适用于110kV以上电压等级架空输电线路外绝缘强度及外绝缘缺陷的监测。The device provided by the utility model is closely combined with the reality of the power system, and can effectively monitor the discharge of the transmission line insulator or the change of the external insulation strength, which helps the operation and maintenance department to understand and grasp the operation status of the insulator in time. Once the external insulation strength of the transmission line is found Deterioration, early warning signals can be issued in time, so that relevant personnel can take timely countermeasures to avoid the occurrence and development of external insulation faults on transmission lines, and ensure the safe and stable operation of the power system. The device provided by the utility model is particularly suitable for monitoring the external insulation strength and external insulation defects of overhead transmission lines with a voltage level above 110kV.
附图说明Description of drawings
图1是本实用新型实施例的电路结构图。Fig. 1 is the circuit structure diagram of the utility model embodiment.
图2是本实用新型实施例的A/D转换单元电路图。 Fig. 2 is a circuit diagram of the A/D conversion unit of the embodiment of the present invention.
具体实施方式Detailed ways
下面结合附图对本实用新型的最佳实施方案作进一步的详细的描述。Below in conjunction with accompanying drawing, the best embodiment of the present utility model is described in further detail.
如图1所示，本实用新型实施例所提供装置包含聚焦超声传感器1，阻抗匹配器2，信号放大器3，补偿放大器4，带通滤波器5，A/D转换单元6，微处理器7，通信接口8，LCD显示单元9，数据存储单元10。聚焦超声传感器1、阻抗匹配器2、信号放大器3、补偿放大器4、带通滤波器5和A/D转换单元6依次连接，微处理器7和补偿放大器4、A/D转换单元6、通信接口8、LCD显示单元9、数据存储单元10分别连接。As shown in Figure 1, the device provided by the embodiment of the utility model includes a focused ultrasonic sensor 1, an impedance matching device 2, a signal amplifier 3, a compensation amplifier 4, a bandpass filter 5, an A/D conversion unit 6, and a microprocessor 7 , communication interface 8, LCD display unit 9, data storage unit 10. Focused ultrasonic sensor 1, impedance matching device 2, signal amplifier 3, compensation amplifier 4, bandpass filter 5 and A/D conversion unit 6 are connected sequentially, and microprocessor 7 and compensation amplifier 4, A/D conversion unit 6, communication The interface 8, the LCD display unit 9, and the data storage unit 10 are respectively connected.
聚焦超声传感器1输出输电线路放电所产生超声波信号相应的电信号，经过阻抗匹配器2后依次输出到信号放大器3、补偿放大器4，补偿放大器4输出补偿放大结果到带通滤波器5，带通滤波器5的输出送入A/D转换单元6，A/D转换单元6的输出送入微处理器7，微处理器7输出输电线路的放电强度到LCD显示单元9。The focused ultrasonic sensor 1 outputs the electrical signal corresponding to the ultrasonic signal generated by the discharge of the transmission line, and then outputs to the signal amplifier 3 and the compensation amplifier 4 in sequence after passing through the impedance matching device 2, and the compensation amplifier 4 outputs the compensation amplification result to the band-pass filter 5, and the band-pass The output of the filter 5 is sent to the A/D conversion unit 6 , the output of the A/D conversion unit 6 is sent to the microprocessor 7 , and the microprocessor 7 outputs the discharge intensity of the power transmission line to the LCD display unit 9 .
本实用新型实施例使用时，工作原理如下：When the utility model embodiment uses, working principle is as follows:
其中聚焦超声传感器1由1个超声波传感器和1个用于聚焦超声波的抛物面天线构成；聚焦超声传感器1将输电线路上的放电产生的超声波信号转变为电信号，经过阻抗匹配器2后，输出到信号放大器3进行信号放大；补偿放大器4将信号放大器3输出的信号进行补偿放大，使之与A/D转换单元6所用转换芯片的测量范围相匹配，然后输入带通滤波器5，滤去信号中的噪声，最后送入A/D转换单元6，A/D转换单元6将模拟信号转变为数字信号并送入微处理器7，微处理器7根据数字信号相应超声信号得到的输电线路的放电强度输入LCD显示单元9，通过LCD显示单元9进行显示。具体实施时，通过LCD显示单元9可以对超过预警值的输电线路的放电强度进行突出显示（例如标示为红色），提示输电线路的外绝缘出现问题。通信接口8用于便携式输电线路外绝缘监测装置与PC机进行通信，微处理器7输出输电线路的放电强度经通信接口8送入外接的PC机进行储存与进一步分析。数据存储单元10则用来保存装置测量得到的数据，微处理器7输出输电线路的放电强度到数据存储单元10即可进行保存。Among them, the focused ultrasonic sensor 1 is composed of an ultrasonic sensor and a parabolic antenna for focusing ultrasonic waves; the focused ultrasonic sensor 1 converts the ultrasonic signal generated by the discharge on the transmission line into an electrical signal, and outputs it to the The signal amplifier 3 performs signal amplification; the compensation amplifier 4 compensates and amplifies the signal output by the signal amplifier 3 to match the measurement range of the conversion chip used by the A/D conversion unit 6, and then inputs the bandpass filter 5 to filter out the signal The noise in the noise is finally sent to the A/D conversion unit 6, and the A/D conversion unit 6 converts the analog signal into a digital signal and sends it to the microprocessor 7, and the microprocessor 7 obtains the discharge of the transmission line corresponding to the ultrasonic signal according to the digital signal The intensity is input to the LCD display unit 9 and displayed on the LCD display unit 9 . During specific implementation, the discharge intensity of the transmission line that exceeds the warning value can be highlighted (for example, marked in red) through the LCD display unit 9 to prompt that there is a problem with the external insulation of the transmission line. The communication interface 8 is used for communication between the portable transmission line external insulation monitoring device and the PC, and the discharge intensity output by the microprocessor 7 is sent to the external PC for storage and further analysis through the communication interface 8 . The data storage unit 10 is used to store the data measured by the device, and the microprocessor 7 outputs the discharge intensity of the transmission line to the data storage unit 10 for storage.
本实施例的聚焦超声传感器1为自行研制的专用传感器，由频率范围在35kHz~45kHz的超声波传感器和抛物面天线构成，抛物面天线通过抛物面进行反射，具体实施时，其聚焦参数可按40kHz超声波达到最佳聚焦效果设计。超声波传感器可采用现有技术中的传感器，安装在抛物面天线的焦点处，可使超声波传感器的灵敏度增加10~20dB。超声波传感器的输出接入阻抗匹配器2。The focused ultrasonic sensor 1 of this embodiment is a self-developed special sensor, which is composed of an ultrasonic sensor with a frequency range of 35 kHz to 45 kHz and a parabolic antenna. The parabolic antenna is reflected by the parabolic surface. Best focus effect design. The ultrasonic sensor can adopt the sensor in the prior art, and is installed at the focal point of the parabolic antenna, which can increase the sensitivity of the ultrasonic sensor by 10~20dB. The output of the ultrasonic sensor is connected to the impedance matching device 2 .
具体实施时，各单元可采用现有芯片。例如，阻抗匹配器2为场效应管FS70SM-2，信号放大器3为仪表放大器AD620，补偿放大器4为精密运算放大器OPA2277，带通滤波器5可采用maxim公司生产的8阶模拟有源连续时间滤波器芯片MAX275。During specific implementation, existing chips can be used for each unit. For example, the impedance matching device 2 is a field effect transistor FS70SM-2, the signal amplifier 3 is an instrumentation amplifier AD620, the compensation amplifier 4 is a precision operational amplifier OPA2277, and the bandpass filter 5 can be an 8-order analog active continuous-time filter produced by maxim. The device chip MAX275.
A/D转换电路6采用A/D转换芯片ADS1286U加放大器芯片PGA309构成，PGA309的输出端连接到ADS1286U的输入端。具体实施时，放大器芯片PGA309可以根据所输入的信号范围，设定放大倍数，结合A/D转换，以提高采样测量精度。A/D转换电路6的内部结构如图2 所示，PGA309的输出端Vout、Vfb连接到ADS1286U的输入端V+、V-，模拟信号经PGA309的输入端Vin1、Vin2进入，转换后所得数字信号经ADS1286U的输出端Dout、DCLK输出。PGA309、ADS1286U的工作电压都为5V。The A/D conversion circuit 6 is composed of an A/D conversion chip ADS1286U plus an amplifier chip PGA309, and the output end of the PGA309 is connected to the input end of the ADS1286U. During specific implementation, the amplifier chip PGA309 can set the amplification factor according to the input signal range, combined with A/D conversion, to improve the sampling and measurement accuracy. The internal structure of the A/D conversion circuit 6 is shown in Figure 2. The output terminals Vout and Vfb of the PGA309 are connected to the input terminals V+ and V- of the ADS1286U, the analog signal enters through the input terminals Vin1 and Vin2 of the PGA309, and the converted digital signal Output through the output terminals Dout and DCLK of ADS1286U. The operating voltage of PGA309 and ADS1286U is 5V.
微处理器7采用TMS320LF2407 芯片构成，具有强大的数据处理能力，可以根据A/D转换单元6输出的数字信号得到超声信号，得到相应输电线路的放电强度，根据是否超过预警值给出输电线路外绝缘的状态。具体超声信号和放电强度的关系为现有技术，本领域技术人员可自行根据现有技术实现分析判断。本实用新型不涉及方法的改进，仅要求硬件的保护。Microprocessor 7 is composed of TMS320LF2407 chip, which has powerful data processing capability. It can obtain ultrasonic signal according to the digital signal output by A/D conversion unit 6, obtain the discharge intensity of corresponding transmission line, and give a warning value according to whether it exceeds the warning value. The state of insulation. The specific relationship between the ultrasonic signal and the discharge intensity is the prior art, and those skilled in the art can realize the analysis and judgment based on the prior art. The utility model does not involve the improvement of the method, but only requires the protection of the hardware.
LCD显示单元9采用定制工业级液晶触摸屏，型号为TFT3224RS-3.5，工作温度为-30℃~60℃，可满足户外工作的需要。The LCD display unit 9 adopts a customized industrial-grade LCD touch screen, the model is TFT3224RS-3.5, and the working temperature is -30°C~60°C, which can meet the needs of outdoor work.
通信接口8采用SN65HVD1050DR芯片，实现CAN工业总线信号输出，抗干扰能力强。Communication interface 8 adopts SN65HVD1050DR chip to realize CAN industrial bus signal output and has strong anti-interference ability.
数据存储单元10可采用工业级CF卡，例如采用Sandisk公司生产的CF5000型工业CF卡构成，具有存储容量大，防震省电，抗干扰能力强等优点，适合在恶劣的户外环境下工作。Data storage unit 10 can adopt industrial grade CF card, for example adopts the CF5000 type industrial CF card that Sandisk company produces, has advantages such as large storage capacity, shockproof power saving, strong anti-interference ability, is suitable for working under harsh outdoor environment.
以上内容是结合具体的优选实施方式对本实用新型所做的进一步详细说明，便于该技术领域的技术人员能理解和应用本实用新型，不能认定本实用新型的具体实施只局限于这些说明。对于本实用新型所属技术领域的普通技术人员来说，在不脱离本实用新型构思的前提下还可以做出若干简单推演或替换，而不必经过创造性的劳动。因此，本领域技术人员根据本实用新型的揭示，对本实用新型做出的简单改进都应该在本实用新型的保护范围之内。The above content is a further detailed description of the utility model in conjunction with specific preferred embodiments, which is convenient for those skilled in the art to understand and apply the utility model, and it cannot be determined that the specific implementation of the utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the utility model belongs, some simple deduction or replacement can be made without departing from the concept of the utility model without creative work. Therefore, simple improvements made to the utility model by those skilled in the art according to the disclosure of the utility model should be within the protection scope of the utility model.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420121272.2UCN203745599U (en) | 2014-03-18 | 2014-03-18 | A portable external insulation monitoring device for transmission lines |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420121272.2UCN203745599U (en) | 2014-03-18 | 2014-03-18 | A portable external insulation monitoring device for transmission lines |
| Publication Number | Publication Date |
|---|---|
| CN203745599Utrue CN203745599U (en) | 2014-07-30 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420121272.2UExpired - Fee RelatedCN203745599U (en) | 2014-03-18 | 2014-03-18 | A portable external insulation monitoring device for transmission lines |
| Country | Link |
|---|---|
| CN (1) | CN203745599U (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158332A (en)* | 2015-08-24 | 2015-12-16 | 河北吉信同普电子科技开发有限公司 | Ultrasonic detector |
| CN106093697A (en)* | 2016-05-27 | 2016-11-09 | 无锡太湖学院 | A kind of circuit monitoring system |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158332A (en)* | 2015-08-24 | 2015-12-16 | 河北吉信同普电子科技开发有限公司 | Ultrasonic detector |
| CN106093697A (en)* | 2016-05-27 | 2016-11-09 | 无锡太湖学院 | A kind of circuit monitoring system |
| CN106093697B (en)* | 2016-05-27 | 2018-12-18 | 无锡太湖学院 | A kind of circuit monitoring system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | Granted publication date:20140730 Termination date:20160318 | |
| CF01 | Termination of patent right due to non-payment of annual fee |