CN105699782B - The test method of the mutual impedance of transmission lines in parallel - Google Patents
The test method of the mutual impedance of transmission lines in parallel Download PDFInfo
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Abstract
本发明涉及一种平行输电线路的互阻抗的测试方法。所述互阻抗的测试方法包括如下步骤：将测试线路中的一相测试线路的首端接入异频试验电压，所述相测试线路的末端接地；测试所述相测试线路的首端电压、首端电流、末端电流，并计算出电压工频分量与电流异频分量；测试运行线路中的一相运行线路的首端电压、首端电流，并计算出电压异频分量与电流工频分量；根据所述电流异频分量和电压异频分量计算所述相测试线路与所述相运行线路之间的互阻抗。本发明的测试方法，在运行线路并不“停电”条件下进行能够准确测试平行输电线路的互阻抗，提高了检测效率和准确性。
The invention relates to a method for testing mutual impedance of parallel transmission lines. The test method of the mutual impedance comprises the steps of: connecting the head end of a phase test line in the test line to a different frequency test voltage, and the end of the phase test line is grounded; testing the voltage at the head end of the phase test line, The head-end current and end current, and calculate the voltage power-frequency component and current different-frequency component; test the head-end voltage and head-end current of one-phase running line in the operating line, and calculate the voltage different-frequency component and current power-frequency component ; Calculate the mutual impedance between the phase test line and the phase operation line according to the current different frequency component and the voltage different frequency component. The testing method of the present invention can accurately test the mutual impedance of the parallel transmission line under the condition that the running line is not "blackout", and improves the detection efficiency and accuracy.
Description
本发明为申请日20110201、申请号201110034423.1且发明名称“平行输电线路的互阻抗、耦合电容的测试方法”的分案申请。The present invention is a divisional application with application date 20110201, application number 201110034423.1, and invention name "Testing method for mutual impedance and coupling capacitance of parallel transmission lines".
技术领域technical field
本发明涉及一种平行输电线路耦合参数的异频增量法，尤其涉及一种平行输电线路的互阻抗、耦合电容的测试方法。The invention relates to a different-frequency incremental method for coupling parameters of parallel transmission lines, in particular to a testing method for mutual impedance and coupling capacitance of parallel transmission lines.
背景技术Background technique
输电线路是电力系统的重要组成部分，输电线路的线路参数需要在线路建成初期测定。而且这些参数虽然在相当一段时期内不会发生变化，但由于长期投运后导线的老化、土壤电阻率变化，或者气候、环境及地理等因素的影响都可能会使线路参数发生变化。因此，电力调度部门要求实测输电线路的工频参数。工频参数一般包括直流电阻、正序阻抗、相间电容、正序电容、零序电容以及多回平行输电线路间的互阻抗和耦合电容。The transmission line is an important part of the power system, and the line parameters of the transmission line need to be measured at the initial stage of the line construction. Moreover, although these parameters will not change for a considerable period of time, the line parameters may change due to the aging of the conductor after long-term operation, changes in soil resistivity, or the influence of climate, environment and geographical factors. Therefore, the power dispatching department requires actual measurement of the power frequency parameters of the transmission line. Power frequency parameters generally include DC resistance, positive sequence impedance, phase-to-phase capacitance, positive sequence capacitance, zero sequence capacitance, and mutual impedance and coupling capacitance between multiple parallel transmission lines.
然而，对平行输电线路的参数测试，尤其是多回平行输电线路之间的耦合参数测试，涉及的停电范围极广，且存在强烈干扰，几乎不可能在实际测试实施。而参数的准确对于电网安全运行至关重要，因此，需要一种能够在相关线路“不停电”的条件下，进行准确测试线路耦合参数的方法。However, the parametric test of parallel transmission lines, especially the coupling parameter test between multiple parallel transmission lines, involves a wide range of outages and strong interference, so it is almost impossible to implement in actual testing. The accuracy of the parameters is crucial to the safe operation of the power grid. Therefore, a method that can accurately test the line coupling parameters under the condition of "no power failure" on the relevant lines is needed.
发明内容Contents of the invention
本发明的目的在于提供一种在相关线路“不停电”条件下进行准确测试平行输电线路的互阻抗的方法。The purpose of the present invention is to provide a method for accurately testing the mutual impedance of parallel transmission lines under the condition of "no power failure" on the relevant lines.
本发明的另一目的在于提供一种在相关线路“不停电”条件下进行准确测试平行输电线路的耦合电容的方法。Another object of the present invention is to provide a method for accurately testing the coupling capacitance of parallel transmission lines under the condition of "no power failure" on the relevant lines.
一种平行输电线路的互阻抗的测试方法，所述平行输电线路包括测试线路和运行线路，所述平行输电线路的互阻抗的测试方法包括如下步骤：将所述测试线路中的一相测试线路的首端接入异频试验电压，所述相测试线路的末端接地；测试所述相测试线路的首端电压、首端电流、末端电流，并计算出电压工频分量与电流异频分量；测试所述运行线路中的一相运行线路的首端电压、首端电流，并计算出电压异频分量与电流工频分量；根据所述电流异频分量和电压异频分量计算所述相测试线路与所述相运行线路之间的互阻抗。A method for testing the mutual impedance of parallel transmission lines, the parallel transmission line includes a test line and an operating line, the method for testing the mutual impedance of the parallel transmission lines comprises the following steps: testing a phase of the test line in the test line The head end of the test line is connected to the different frequency test voltage, and the end of the phase test line is grounded; the head end voltage, the head end current, and the end current of the phase test line are tested, and the voltage power frequency component and the current different frequency component are calculated; Test the head-end voltage and head-end current of one phase of the operation line in the operation line, and calculate the voltage difference frequency component and the current power frequency component; calculate the phase test according to the current difference frequency component and the voltage difference frequency component The mutual impedance between the line and the phase running line.
上述互阻抗测试方法优选的一种技术方案，所述平行输电线路为双回线路，所述相测试线路与所述相运行线路之间的互阻抗其中，为所述电压工频分量，为所述电流异频分量，为所述电压异频分量，为所述电流工频分量。In a preferred technical solution of the above-mentioned mutual impedance testing method, the parallel transmission line is a double-circuit line, and the mutual impedance between the phase test line and the phase operation line is in, is the power frequency component of the voltage, is the frequency shift component of the current, is the frequency-shifted component of the voltage, is the power frequency component of the current.
上述互阻抗测试方法优选的一种技术方案，所述平行输电线路为多回线路，所述相测试线路与所述相运行线路之间的互阻抗其中，为所述电压异频分量，为所述电流异频分量。In a preferred technical solution of the above-mentioned mutual impedance testing method, the parallel transmission line is a multi-circuit line, and the mutual impedance between the phase test line and the phase operation line is in, is the frequency-shifted component of the voltage, is the frequency shift component of the current.
上述互阻抗测试方法优选的一种技术方案，所述异频试验电压的频率范围是47.5Hz到52.5Hz。In a preferred technical solution of the above mutual impedance testing method, the frequency range of the different frequency test voltage is 47.5 Hz to 52.5 Hz.
上述互阻抗测试方法优选的一种技术方案，采用所述测试方法测试所述相测试线路与所述相运行线路之间的互阻抗的次数不少于10次。In a preferred technical solution of the above-mentioned mutual impedance testing method, the times of testing the mutual impedance between the phase test line and the phase running line by using the test method are not less than 10 times.
一种平行输电线路的耦合电容的测试方法，所述平行输电线路包括测试线路和运行线路，所述平行输电线路的耦合电容的测试方法包括如下步骤：将所述测试线路中的一相测试线路的首端接入异频试验电压，所述相测试线路的末端开路；测试所述相测试线路的首端电压、首端电流、末端电流与频率，并计算出电压工频分量与电流工频分量；测试所述运行线路中的一相运行线路的首端电压、首端电流与频率，并计算出电压异频分量与电流异频分量；根据所述电流异频分量和电压异频分量计算所述相测试线路与所述相运行线路之间的耦合电容。A method for testing the coupling capacitance of a parallel transmission line, the parallel transmission line includes a test line and an operating line, the method for testing the coupling capacitance of the parallel transmission line includes the following steps: a phase test line in the test line The head end of the phase test line is connected to the different frequency test voltage, and the end of the phase test line is open; the head end voltage, head end current, end current and frequency of the phase test line are tested, and the voltage power frequency component and current power frequency are calculated. component; test the head-end voltage, head-end current and frequency of one-phase running line in the running line, and calculate the voltage different-frequency component and current different-frequency component; calculate according to the current different-frequency component and voltage different-frequency component A coupling capacitance between the phase test line and the phase run line.
上述耦合电容测试方法优选的一种技术方案，所述平行输电线路为双回线路，所述相测试线路与所述相运行线路之间的耦合电容其中，为电压工频分量，为电流工频分量，f1为异频频率，为电压异频分量，为电流异频分量，f2为工频频率。In a preferred technical solution of the above-mentioned coupling capacitance testing method, the parallel transmission line is a double-circuit line, and the coupling capacitance between the phase test line and the phase operation line is in, is the power frequency component of the voltage, is the current power frequency component, f 1 is the different frequency, is the voltage shift component, Is the different frequency component of the current, and f 2 is the power frequency.
上述耦合电容测试方法优选的一种技术方案，所述平行输电线路为多回线路，所述相测试线路与所述相运行线路之间的耦合电容其中，为电压异频分量，为电流异频分量，f2为工频频率。In a preferred technical solution of the above-mentioned coupling capacitance testing method, the parallel transmission line is a multi-circuit line, and the coupling capacitance between the phase test line and the phase operation line is in, is the voltage shift component, Is the different frequency component of the current, and f 2 is the power frequency.
上述耦合电容测试方法优选的一种技术方案，所述测试方法的采样频率为fs，则其中，f1为异频频率，f2为工频频率，N为采样长度。A preferred technical solution of the above-mentioned coupling capacitance test method, the sampling frequency of the test method is f s , then Among them, f 1 is the different frequency, f 2 is the power frequency, and N is the sampling length.
上述耦合电容测试方法优选的一种技术方案，所述异频试验电压的频率范围是47.5Hz到52.5Hz。In a preferred technical solution of the above coupling capacitance testing method, the frequency range of the different frequency test voltage is 47.5 Hz to 52.5 Hz.
本发明的平行输电线路的互阻抗、耦合电容的测试方法，在运行线路并不“停电”的条件下，能够准确测试平行输电线路的互阻抗、耦合电容，提高了检测效率和准确性。The method for testing the mutual impedance and coupling capacitance of parallel transmission lines of the present invention can accurately test the mutual impedance and coupling capacitance of parallel transmission lines under the condition that the operating line does not "blackout", and improves the detection efficiency and accuracy.
附图说明Description of drawings
图1是本发明的平行输电线路的互阻抗的测试原理的示意图。Fig. 1 is a schematic diagram of the testing principle of the mutual impedance of parallel transmission lines according to the present invention.
图2是本发明的平行输电线路的互阻抗的测试方法的流程图。Fig. 2 is a flow chart of the method for testing the mutual impedance of parallel transmission lines according to the present invention.
图3是本发明的平行输电线路的耦合电容的测试原理的示意图。Fig. 3 is a schematic diagram of the testing principle of the coupling capacitance of the parallel transmission line according to the present invention.
图4是本发明的平行输电线路的耦合电容的测试方法的流程图。Fig. 4 is a flow chart of the testing method of the coupling capacitance of the parallel transmission line according to the present invention.
具体实施方式Detailed ways
为使本发明的目的、技术方案和优点更加清楚，下面以双回输电线路为例，对本发明作进一步的详细描述。In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below taking a double-circuit transmission line as an example.
在本发明的测试方法中，平行双回输电线路包括测试线路和运行线路，其中，测试线路包括A相测试线路、B相测试线路和C相测试线路，运行线路包括A相运行线路、B相运行线路和C相运行线路。所述A相测试线路与所述A相运行线路相对应，所述B相测试线路与所述B相运行线路相对应，所述C相测试线路与所述C相运行线路相对应。In the test method of the present invention, the parallel double-circuit transmission line includes a test line and an operating line, wherein the test line includes a phase A test line, a B phase test line and a C phase test line, and the operating line includes an A phase operating line, a B phase Running line and Phase C running line. The A-phase test line corresponds to the A-phase operating line, the B-phase test line corresponds to the B-phase operating line, and the C-phase test line corresponds to the C-phase operating line.
下面以测试双回输电线路中的B相测试线路和B相运行线路之间的互阻抗为例，详细说明本发明的平行输电线路的互阻抗的测试方法。请参阅图1，图1是本发明的平行输电线路的互阻抗的测试原理的示意图。所述B相测试线路的首端接入异频试验电压Us，所述B相测试线路的末端接地。优选的，所述异频试验电压的频率范围是47.5Hz到52.5Hz。首端测量装置11通过第一电压互感器13和第一电流互感器14连接所述B相测试线路的首端，用于测试所述B相测试线路的首端电压和首端电流。所述首端测量装置11还通过第二电压互感器15和第二电流互感器16连接所述B相运行线路的首端，用于测试所述B相运行线路的首端电压和首端电流。末端测量装置12通过第三电流互感器17连接所述B相运行线路的末端，用于测试所述B相运行线路的末端电流。Taking the mutual impedance test between the B-phase test line and the B-phase operating line in the double-circuit transmission line as an example, the method for testing the mutual impedance of the parallel transmission line of the present invention will be described in detail below. Please refer to FIG. 1 . FIG. 1 is a schematic diagram of the testing principle of the mutual impedance of parallel transmission lines according to the present invention. The first end of the B-phase test line is connected to the different-frequency test voltage Us, and the end of the B-phase test line is grounded. Preferably, the frequency range of the different frequency test voltage is 47.5Hz to 52.5Hz. The head-end measuring device 11 is connected to the head-end of the B-phase test line through the first voltage transformer 13 and the first current transformer 14, and is used for testing the head-end voltage and head-end current of the B-phase test line. The head-end measuring device 11 is also connected to the head-end of the B-phase running line through a second voltage transformer 15 and a second current transformer 16, for testing the head-end voltage and head-end current of the B-phase running line . The end measurement device 12 is connected to the end of the B-phase running line through the third current transformer 17, and is used for testing the terminal current of the B-phase running line.
请参阅图2，图2是本发明的平行输电线路的互阻抗的测试方法的流程图。本发明的平行输电线路的互阻抗的测试方法包括如下步骤：Please refer to FIG. 2 . FIG. 2 is a flow chart of the method for testing the mutual impedance of parallel transmission lines according to the present invention. The testing method of the mutual impedance of parallel transmission line of the present invention comprises the steps:
将所述B相测试线路的首端接入异频试验电压，所述B相测试线路的末端接地。优选的，所述异频试验电压的频率范围是47.5Hz到52.5Hz。The first end of the B-phase test line is connected to different frequency test voltage, and the end of the B-phase test line is grounded. Preferably, the frequency range of the different frequency test voltage is 47.5Hz to 52.5Hz.
测量所述B相测试线路的首端电压、首端电流、末端电流，并计算出电压工频分量与电流异频分量 Measure the head-end voltage, head-end current, and end current of the B-phase test line, and calculate the power frequency component of the voltage Different frequency component from the current
测量所述B相运行线路的首端电压、首端电流，并计算出电压异频分量与电流工频分量优选的，所述B相测试线路和所述B相运行线路的首末端同步测试录波。Measure the head-end voltage and head-end current of the B-phase running line, and calculate the voltage difference frequency component and current power frequency component Preferably, the B-phase test line and the start and end of the B-phase running line are synchronously tested and recorded.
按照式子(1)计算所述B相测试线路与所述B相运行线路之间的互阻抗，进而折算至50Hz。The mutual impedance between the B-phase test line and the B-phase running line is calculated according to formula (1), and then converted to 50 Hz.
依据上述测试方法，对相应的测试线路变化加压与测试接线，即可分别测出A相测试线路与A相运行线路、A相测试线路与B相运行线路、A相测试线路与C相运行线路、B相测试线路与A相运行线路、B相测试线路与C相运行线路、C相测试线路与A相运行线路、C相测试线路与B相运行线路、C相测试线路与C相运行线路之间的互阻抗。According to the above test method, change the pressure and test wiring of the corresponding test line, and then measure the A-phase test line and A-phase running line, A-phase test line and B-phase running line, and A-phase test line and C-phase running line respectively. Line, B-phase test line and A-phase running line, B-phase test line and C-phase running line, C-phase testing line and A-phase running line, C-phase testing line and B-phase running line, C-phase testing line and C-phase running line Mutual impedance between lines.
本发明的平行输电线路的互阻抗的测试方法也适用于平行多回输电线路。测试多回输电线路之间的互阻抗时，用上述测试方法，根据平行组合进行测试即可。对于平行多回输电线路，为了进一步提高测试结果的准确性，测试线路与对应运行线路之间的互阻抗The method for testing the mutual impedance of parallel transmission lines of the present invention is also applicable to parallel multi-circuit transmission lines. When testing the mutual impedance between multiple transmission lines, use the above test method to test according to the parallel combination. For parallel multi-circuit transmission lines, in order to further improve the accuracy of test results, the mutual impedance between the test line and the corresponding operating line
其中，为运行线路的电压异频分量，为测试线路的电流异频分量。in, is the voltage difference frequency component of the operating line, is the current frequency component of the test line.
优选的，在本发明的平行输电线路的互阻抗的测试方法中，每相测试线路与对应运行线路之间的互阻抗的测试次数不少于10次，从中选取最优值或者平均值。优选的，在本发明的测试方法中，选用数字滤波器。本发明的测试方法中的采样频率fs与采样时间的选取应满足式(3)要求，Preferably, in the method for testing the mutual impedance of parallel transmission lines of the present invention, the number of times of testing the mutual impedance between each phase test line and the corresponding operating line is not less than 10, and the optimal value or average value is selected therefrom. Preferably, in the testing method of the present invention, a digital filter is selected. The selection of sampling frequency f s and sampling time in the test method of the present invention should meet the requirement of formula (3),
其中，f1为异频频率，f2为工频频率，N为采样长度。Among them, f 1 is the different frequency, f 2 is the power frequency, and N is the sampling length.
下面以测试双回输电线路中的B相测试线路和B相运行线路之间的耦合电容为例，详细说明本发明的平行输电线路的耦合电容的测试方法。请参阅图3，图3是本发明的平行输电线路的耦合电容的测试原理的示意图。所述B相测试线路的首端接入异频试验电压Us，所述B相测试线路的末端开路。优选的，所述异频试验电压的频率范围是47.5Hz到52.5Hz。首端测量装置21通过第一电压互感器23和第一电流互感器24连接所述B相测试线路的首端，用于测试所述B相测试线路的首端电压和首端电流。所述首端测量装置21还通过第二电压互感器25和第二电流互感器26连接所述B相运行线路的首端，用于测试所述B相运行线路的首端电压和首端电流。末端测量装置22通过第三电流互感器27连接所述B相运行线路的末端，用于测试所述B相运行线路的末端电流。Taking the test of the coupling capacitance between the B-phase test line and the B-phase running line in the double-circuit transmission line as an example, the method for testing the coupling capacitance of the parallel transmission line of the present invention will be described in detail below. Please refer to FIG. 3 . FIG. 3 is a schematic diagram of the testing principle of the coupling capacitance of parallel transmission lines according to the present invention. The first end of the B-phase test line is connected to the different-frequency test voltage Us, and the end of the B-phase test line is open. Preferably, the frequency range of the different frequency test voltage is 47.5Hz to 52.5Hz. The head-end measuring device 21 is connected to the head-end of the B-phase test line through the first voltage transformer 23 and the first current transformer 24, and is used for testing the head-end voltage and head-end current of the B-phase test line. The head-end measuring device 21 is also connected to the head-end of the B-phase running line through a second voltage transformer 25 and a second current transformer 26, for testing the head-end voltage and head-end current of the B-phase running line . The terminal measuring device 22 is connected to the terminal of the B-phase running line through the third current transformer 27, and is used for testing the terminal current of the B-phase running line.
请参阅图4，图4是本发明的平行输电线路的耦合电容的测试方法的流程图。本发明的平行输电线路的耦合电容的测试方法包括如下步骤：Please refer to FIG. 4 . FIG. 4 is a flow chart of the method for testing the coupling capacitance of parallel transmission lines according to the present invention. The testing method of the coupling capacitance of parallel transmission line of the present invention comprises the steps:
将所述B相测试线路的首端接入异频试验电压，所述B相测试线路的末端开路。优选的，所述异频试验电压的频率范围是47.5Hz到52.5Hz。The first end of the B-phase test line is connected to different frequency test voltage, and the end of the B-phase test line is opened. Preferably, the frequency range of the different frequency test voltage is 47.5Hz to 52.5Hz.
测量所述B相测试线路的首端电压、首端电流、末端电流，并计算出电压工频分量与电流工频分量 Measure the head-end voltage, head-end current, and end current of the B-phase test line, and calculate the power frequency component of the voltage and current power frequency component
测量所述B相运行线路的首端电压、首端电流，并计算出电压异频分量与电流异频分量优选的，所述B相测试线路和所述B相运行线路的首末端同步测试录波。Measure the head-end voltage and head-end current of the B-phase running line, and calculate the voltage difference frequency component Different frequency component from the current Preferably, the B-phase test line and the start and end of the B-phase running line are synchronously tested and recorded.
按照式子(4)计算所述B相测试线路与所述B相运行线路之间的耦合电容，进而折算至50Hz。The coupling capacitance between the B-phase test line and the B-phase running line is calculated according to formula (4), and then converted to 50 Hz.
依据上述测试方法，对相应的测试线路变化加压与测试接线，即可分别测出A相测试线路与A相运行线路、A相测试线路与B相运行线路、A相测试线路与C相运行线路、B相测试线路与A相运行线路、B相测试线路与C相运行线路、C相测试线路与A相运行线路、C相测试线路与B相运行线路、C相测试线路与C相运行线路之间的耦合电容。According to the above test method, change the pressure and test wiring of the corresponding test line, and then measure the A-phase test line and A-phase running line, A-phase test line and B-phase running line, and A-phase test line and C-phase running line respectively. Line, B-phase test line and A-phase running line, B-phase test line and C-phase running line, C-phase testing line and A-phase running line, C-phase testing line and B-phase running line, C-phase testing line and C-phase running line coupling capacitance between lines.
本发明的平行输电线路的耦合电容的测试方法也适用于平行多回输电线路。测试多回输电线路之间的耦合电容时，用上述测试方法，根据平行组合进行测试即可。对于平行多回输电线路，为了进一步提高测试结果的准确性，测试线路与对应运行线路之间的耦合电容The method for testing the coupling capacitance of parallel transmission lines of the present invention is also applicable to parallel multi-circuit transmission lines. When testing the coupling capacitance between multiple transmission lines, use the above test method to test according to the parallel combination. For parallel multi-circuit transmission lines, in order to further improve the accuracy of the test results, the coupling capacitance between the test line and the corresponding operating line
其中，为运行线路的电压异频分量，为运行线路的电流异频分量。in, is the voltage difference frequency component of the operating line, It is the different frequency component of the current of the running line.
优选的，在本发明的平行输电线路的耦合电容的测试方法中，每相测试线路与对应运行线路之间的耦合电容的测试次数不少于10次，从中选取最优值或者平均值。优选的，在本发明的测试方法中，选用数字滤波器。本发明的测试方法中的采样频率fs与采样时间的选取应满足式(6)要求，Preferably, in the method for testing the coupling capacitance of parallel transmission lines of the present invention, the number of times of testing the coupling capacitance between each phase test line and the corresponding operating line is not less than 10, and the optimal value or average value is selected therefrom. Preferably, in the testing method of the present invention, a digital filter is selected. The selection of sampling frequency f s and sampling time in the test method of the present invention should meet the requirement of formula (6),
其中，f1为异频频率，f2为工频频率，N为采样长度。Among them, f 1 is the different frequency, f 2 is the power frequency, and N is the sampling length.
与现有技术相比，本发明的平行输电线路的互阻抗、耦合电容的测试方法，在运行线路并不“停电”的条件下，能够准确测试平行输电线路的互阻抗、耦合电容，提高了检测效率和准确性。Compared with the prior art, the method for testing the mutual impedance and coupling capacitance of parallel transmission lines of the present invention can accurately test the mutual impedance and coupling capacitance of parallel transmission lines under the condition that the operating line does not "blackout", which improves the detection efficiency and accuracy.
在不偏离本发明的精神和范围的情况下还可以构成许多有很大差别的实施例。应当理解，除了如所附的权利要求所限定的，本发明并不限于在说明书中所述的具体实施例。Many widely different embodiments may also be constructed without departing from the spirit and scope of the invention. It should be understood that the invention is not limited to the specific embodiments described in the specification, except as defined in the appended claims.
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