CN204287327U - A kind of ultra-high-tension power transmission line zero sequence impedance metering circuit - Google Patents
A kind of ultra-high-tension power transmission line zero sequence impedance metering circuit Download PDFInfo
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Abstract
本实用新型所述的一种高压输电线路零序阻抗测量电路，包括相互平行的三相导线、可调电压源、电压互感器、第一测量装置、第二测量装置、数据处理单元、第一电流互感器、第二电流互感器、分压处理电路；所述三相导线的收尾两端分别相互连接，第一电流互感器串接在三相导线的尾端,另一端经第二测量装置与数据处理单元连接，第二电流互感器串接在三相导线的首端、可调电压源连接在三相导线的首端，电压互感器的输入端连接在三相导线的中部、输出端与第一测量装置相连。本实用新型通过测量输电线路两端的分压处理电路平均值进行修正，解决了输电线路上的分布电容对零序参数测量的影响，从而大大提高了输电线路零序参数测量结果的精度。
A zero-sequence impedance measuring circuit of a high-voltage transmission line described in the utility model includes three-phase wires parallel to each other, an adjustable voltage source, a voltage transformer, a first measuring device, a second measuring device, a data processing unit, a first A current transformer, a second current transformer, and a voltage division processing circuit; the two ends of the three-phase wires are connected to each other respectively, the first current transformer is connected in series at the tail end of the three-phase wires, and the other end is passed through the second measuring device It is connected with the data processing unit, the second current transformer is connected in series with the head end of the three-phase wire, the adjustable voltage source is connected with the head end of the three-phase wire, the input end of the voltage transformer is connected with the middle part and the output end of the three-phase wire connected to the first measuring device. The utility model corrects by measuring the average value of the voltage dividing processing circuit at both ends of the transmission line, and solves the influence of the distributed capacitance on the transmission line on the zero-sequence parameter measurement, thereby greatly improving the accuracy of the zero-sequence parameter measurement result of the transmission line.
Description
技术领域 technical field
本实用新型涉及电力系统输电线路参数测量技术领域，具体涉及一种高压输电线路零序阻抗测量电路。 The utility model relates to the technical field of parameter measurement of power system transmission lines, in particular to a zero-sequence impedance measurement circuit of a high-voltage transmission line.
背景技术 Background technique
输电线路是电力输送的载体，是电力系统的主要组成部分之一，对电力系统起着极其重要的作用。输电线路的工频参数主要包括正序阻抗、正序电容、零序阻抗、零序电容以及多回互感线路之间的互感等，这些参数用于电力系统进行潮流计算、短路电流计算、继电保护整定计算以及选择电力系统运行方式，其准确性直接关系到这些计算结果的准确性。准确地获取输电线路的参数对于电力系统有重要的意义，尤其是随着我国电力系统的不断发展，电网的不断扩大，电力系统自动化程度的不断提高，对输电线路参数的准确性要求越来越高。线路参数的计算较为复杂，同时受很多不确定因素的影响，包括线路的几何形状、电流、环境温度、风速、土壤电阻率、避雷线架设方式和线路路径等因素。长距离输电的线路下垂、带电线路的集肤效应和发热、地质情况的随机性质等等都会给精确计算线路参数带来困难。通常已知的输电线路参数是线路建成初期测定的，这些参数在投运后由于气候、温度、环境及地理等因素的影响会或多或少发生变化。因此，有必要全面深入地研究平行线路间相互影响的机理，结合现有测试方法的适应性分析，提出对平行线路参数测试的特殊技术要求，为正确选用参数测试方法及测试的准确性与可靠性提供依据。 The transmission line is the carrier of power transmission and one of the main components of the power system, which plays an extremely important role in the power system. The power frequency parameters of transmission lines mainly include positive-sequence impedance, positive-sequence capacitance, zero-sequence impedance, zero-sequence capacitance, and mutual inductance between multi-circuit mutual inductance lines. The accuracy of protection setting calculation and selection of power system operation mode is directly related to the accuracy of these calculation results. Accurately obtaining the parameters of transmission lines is of great significance to the power system, especially with the continuous development of my country's power system, the continuous expansion of the power grid, and the continuous improvement of the degree of automation of the power system, the accuracy of transmission line parameters is increasingly required. high. The calculation of line parameters is complex and affected by many uncertain factors, including line geometry, current, ambient temperature, wind speed, soil resistivity, lightning protection line erection method, line path and other factors. Line sagging for long-distance power transmission, skin effect and heating of live lines, random nature of geological conditions, etc. will bring difficulties to accurately calculate line parameters. Usually known transmission line parameters are measured at the initial stage of line construction, and these parameters will change more or less due to factors such as climate, temperature, environment and geography after the line is put into operation. Therefore, it is necessary to comprehensively study the mechanism of mutual influence between parallel lines, combine the adaptability analysis of existing test methods, and put forward special technical requirements for parallel line parameter testing, in order to correctly select parameter test methods and test accuracy and reliability Sex provides a basis.
实用新型内容 Utility model content
本实用新型要解决的技术问题是提供一种高压输电线路零序阻抗测量电路，解决了输电线路上的分布电容对零序参数测量的影响，从而大大提高了输电线路零序参数测量结果的精度。 The technical problem to be solved by the utility model is to provide a zero-sequence impedance measurement circuit of a high-voltage transmission line, which solves the influence of the distributed capacitance on the transmission line on the measurement of the zero-sequence parameters, thereby greatly improving the accuracy of the measurement results of the zero-sequence parameters of the transmission line .
为解决上述技术问题，本实用新型采用以下技术方案： In order to solve the above technical problems, the utility model adopts the following technical solutions:
一种高压输电线路零序阻抗测量电路，包括相互平行的三相导线、可调电压源、电压互感器、第一测量装置、第二测量装置、数据处理单元、第一电流互感器、第二电流互感器、分压处理电路；所述三相导线的收尾两端分别相互连接，所述第一电流互感器串接在三相导线的尾端、其输出端的一端接地、另一端经第二测量装置与数据处理单元连接，所述第二电流互感器串接在三相导线的首端、其输出端的一端接地、另一端与第一测量装置相连，所述可调电压源连接在三相导线的首端，所述电压互感器的输入端连接在三相导线的中部、输出端与第一测量装置相连；所述分压处理电路包括滤波装置、第一电容、传感器、第二电容；所述滤波装置的输入端经开关连接在第二电流互感器与第一测量装置之间的节点处，滤波装置的输出端经第一电容与传感器二次侧相连，传感器的一次侧的并接在数据处理单元的两端，所述第二电容并联在传感器一次侧的两端。 A zero-sequence impedance measurement circuit of a high-voltage transmission line, including three-phase wires parallel to each other, an adjustable voltage source, a voltage transformer, a first measuring device, a second measuring device, a data processing unit, a first current transformer, a second A current transformer and a voltage division processing circuit; the ends of the three-phase wires are respectively connected to each other, the first current transformer is connected in series to the tail ends of the three-phase wires, one end of its output end is grounded, and the other end is connected to the second The measuring device is connected to the data processing unit, the second current transformer is connected in series with the first end of the three-phase wire, one end of its output end is grounded, and the other end is connected to the first measuring device, and the adjustable voltage source is connected to the three-phase The first end of the wire, the input end of the voltage transformer is connected to the middle of the three-phase wire, and the output end is connected to the first measuring device; the voltage division processing circuit includes a filter device, a first capacitor, a sensor, and a second capacitor; The input end of the filter device is connected to the node between the second current transformer and the first measuring device through a switch, the output end of the filter device is connected to the secondary side of the sensor through the first capacitor, and the primary side of the sensor is connected in parallel At both ends of the data processing unit, the second capacitor is connected in parallel at both ends of the primary side of the sensor.
所述分压处理电路还包括电阻，所述电阻并联在第二电容的两端。 The voltage division processing circuit further includes a resistor connected in parallel to both ends of the second capacitor.
所述滤波装置由第三电容、电感组成，所述电感的一端与开关相连，另一端与第一电容相连，所述第三电容的一端的连接在第一测量装置和电感之间的节点处，另一端接地。 The filtering device is composed of a third capacitor and an inductor, one end of the inductor is connected to the switch, the other end is connected to the first capacitor, and one end of the third capacitor is connected to the node between the first measuring device and the inductor , and the other end is grounded.
本实用新型的有益效果是：本实用新型通过测量输电线路两端的分压处理电路平均值进行修正，解决了输电线路上的分布电容对零序参数测量的影响，从而大大提高了输电线路零序参数测量结果的精度。在阻抗回路中，串联一个标准分压电容器，从而构成分压结构，在传递局放信号的同时，还能获得设备的电压信号。该电压信号通过低通滤波装置滤除高次谐波后，进入测量装置得到设备高压电压，从而提高了测试的准确性。 The beneficial effects of the utility model are: the utility model corrects by measuring the average value of the voltage dividing processing circuit at both ends of the transmission line, and solves the influence of the distributed capacitance on the transmission line on the zero-sequence parameter measurement, thereby greatly improving the zero-sequence parameters of the transmission line. The precision of the parameter measurement results. In the impedance loop, a standard voltage-dividing capacitor is connected in series to form a voltage-dividing structure, and the voltage signal of the device can be obtained while transmitting the partial discharge signal. After the high-order harmonics are filtered out by the low-pass filter device, the voltage signal enters the measuring device to obtain the high-voltage voltage of the equipment, thereby improving the accuracy of the test.
附图说明 Description of drawings
图1为本实用新型的电路图。 Fig. 1 is the circuit diagram of the utility model.
具体实施方式 Detailed ways
下面结合附图对本实用新型作进一步的描述。 Below in conjunction with accompanying drawing, the utility model is further described.
如图1所示，本实施例的高压输电线路零序阻抗测量电路，包括相互平行的A、B、C三相导线、可调电压源1、电压互感器2、第一测量装置3、第二测量装置4、数据处理单元5、第一电流互感器6、第二电流互感器7、分压处理电路；三相导线的收尾两端分别相互连接，第一电流互感器6串接在三相导线的尾端、其输出端的一端接地、另一端经第二测量装置4与数据处理单元5连接，第二电流互感器7串接在三相导线的首端、其输出端的一端接地、另一端与第一测量装置3相连，可调电压源1连接在三相导线的首端，电压互感器2的输入端连接在三相导线的中部、输出端与第一测量装置3相连；分压处理电路包括滤波装置91、第一电容92、传感器93、第二电容94；滤波装置91的输入端经开关K连接在第二电流互感器7与第一测量装置3之间的节点处，滤波装置91的输出端经第一电容92与传感器93二次侧相连，传感器93的一次侧的并接在数据处理单元5的两端，第二电容94并联在传感器93一次侧的两端。分压处理电路还包括补偿电阻R，电阻R并联在第二电容94的两端。 As shown in Figure 1, the high-voltage transmission line zero-sequence impedance measurement circuit of this embodiment includes three-phase wires A, B, and C parallel to each other, an adjustable voltage source 1, a voltage transformer 2, a first measuring device 3, and a first measuring device 3. Two measuring devices 4, data processing unit 5, first current transformer 6, second current transformer 7, voltage division processing circuit; the ends of the three-phase wires are connected to each other respectively, and the first current transformer 6 is connected in series in three The tail end of the phase wire, one end of its output end is grounded, the other end is connected to the data processing unit 5 through the second measuring device 4, the second current transformer 7 is connected in series at the head end of the three-phase wire, one end of its output end is grounded, and the other end is connected to the data processing unit 5. One end is connected to the first measuring device 3, the adjustable voltage source 1 is connected to the head end of the three-phase wire, the input end of the voltage transformer 2 is connected to the middle of the three-phase wire, and the output end is connected to the first measuring device 3; The processing circuit includes a filter device 91, a first capacitor 92, a sensor 93, and a second capacitor 94; the input terminal of the filter device 91 is connected to the node between the second current transformer 7 and the first measuring device 3 through a switch K, and the filter The output terminal of the device 91 is connected to the secondary side of the sensor 93 through the first capacitor 92, the primary side of the sensor 93 is connected to both ends of the data processing unit 5 in parallel, and the second capacitor 94 is connected in parallel to both ends of the primary side of the sensor 93. The voltage division processing circuit further includes a compensating resistor R, and the resistor R is connected in parallel with both ends of the second capacitor 94 .
进一步的，滤波装置91由第三电容911、电感912组成，电感912的一端与开关K相连，另一端与第一电容92相连，第三电容911的一端的连接在第一测量装置3和电感912之间的节点处，另一端接地。 Further, the filter device 91 is composed of a third capacitor 911 and an inductor 912, one end of the inductor 912 is connected to the switch K, the other end is connected to the first capacitor 92, and one end of the third capacitor 911 is connected to the first measuring device 3 and the inductor 912 at the node, and the other end is grounded.
本实用新型通过测量输电线路两端的分压处理电路平均值进行修正，解决了输电线路上的分布电容对正序参数测量的影响，从而大大提高了输电线路正序参数测量结果的精度。在阻抗回路中，串联一个标准分压电容器，从而构成分压结构，在传递局放信号的同时，还能获得设备的电压信号。该电压信号通过低通滤波装置滤除高次谐波后，进入测量装置得到设备高压电压，从而提高了测试的准确性。 The utility model corrects by measuring the average value of the voltage dividing processing circuit at both ends of the transmission line, and solves the influence of the distributed capacitance on the transmission line on the measurement of the positive sequence parameters, thereby greatly improving the accuracy of the measurement results of the positive sequence parameters of the transmission line. In the impedance loop, a standard voltage-dividing capacitor is connected in series to form a voltage-dividing structure, and the voltage signal of the device can be obtained while transmitting the partial discharge signal. After the high-order harmonics are filtered out by the low-pass filter device, the voltage signal enters the measuring device to obtain the high-voltage voltage of the equipment, thereby improving the accuracy of the test.
本技术领域的普通技术人员应当认识到，以上的实施方式仅是用来说明本实用新型，而并非用作为对本实用新型的限定，只要在本实用新型的实质精神范围之内，对以上实施例所作的适当改变和变化都落在本实用新型要求保护的范围之内。 Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the utility model, rather than as a limitation to the utility model, as long as within the spirit of the utility model, the above embodiments Appropriate changes and changes all fall within the scope of protection of the utility model.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459330A (en) * | 2014-12-25 | 2015-03-25 | 国家电网公司 | High-voltage transmission line zero-sequence impedance measuring circuit and method |
| WO2024047379A1 (en) * | 2022-08-29 | 2024-03-07 | Mahdi Davarpanah | Zero-sequence impedance measurement of coupled ac transmission lines |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459330A (en) * | 2014-12-25 | 2015-03-25 | 国家电网公司 | High-voltage transmission line zero-sequence impedance measuring circuit and method |
| CN104459330B (en) * | 2014-12-25 | 2017-04-12 | 国家电网公司 | High-voltage transmission line zero-sequence impedance measuring circuit and method |
| WO2024047379A1 (en) * | 2022-08-29 | 2024-03-07 | Mahdi Davarpanah | Zero-sequence impedance measurement of coupled ac transmission lines |
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