A non-contact measurement method and system for hybrid line overvoltage

Abstract

The present invention relates to the technical field of overvoltage measurement of power transmission lines in power systems, and discloses a non-contact measurement method and system for overvoltage of hybrid lines. The present invention uses a sensor to measure the electric field signal of the cable terminal of an overhead hybrid line under non-contact conditions, calculates the decoupling matrix M by using the known phase voltage of the cable terminal in a steady state and the measurement result of the sensor, and calculates the measurement value of the sensor under overvoltage according to the calculation result of the decoupling matrix M, and uses the calculated measurement value as the trigger threshold of the overvoltage. After the sensor captures the voltage signal, the captured voltage signal is substituted into the decoupling equation to obtain the overvoltage of the corresponding cable terminal; the present invention can realize non-contact measurement and non-stop installation of the measuring device, and can accurately obtain the overvoltage condition of each phase on the measured cable terminal.

Description

Technical Field

[0001] The present invention relates to the technical field of overvoltage measurement of power system transmission lines, and in particular to a non-contact measurement method and system for overvoltage of a hybrid line. Background Art

[0002] For hybrid lines formed by interconnecting cables and overhead lines, the overvoltage amplitude of the hybrid line is higher than that of a single line due to the differences in voltage resistance and line parameters between cables and overhead lines, which can cause line flashover or breakdown. Therefore, it is necessary to measure the overvoltage of the hybrid line.

[0003] In traditional technology, voltage transformers are used to measure overvoltage. Due to the variety of overvoltage types, among which the transient overvoltage frequency exceeds the bandwidth of the voltage transformer, overvoltage detection relying solely on voltage transformers cannot obtain accurate measurement results. In addition, the installation of voltage transformers on existing operating lines often requires power outages, which affects the operating indicators of the power sector. Summary of the invention

[0004] The present invention provides a non-contact measurement method and system for overvoltage of a hybrid line, which solves the technical problems of low measurement accuracy and inconvenient installation in the conventional method of measuring overvoltage using a voltage transformer.

[0005] A first aspect of the present invention provides a non-contact measurement method for hybrid line overvoltage, comprising:

[0006] Non-contact sensors are arranged on the hybrid line, wherein each non-contact sensor includes a first sensor for detecting a cable terminal of phase A, a second sensor for detecting a cable terminal of phase B, and a third sensor for detecting a cable terminal of phase C, and the first sensor, the second sensor, and the third sensor are arranged so that the installation positions of the first sensor, the second sensor, and the third sensor relative to the corresponding cable terminal are consistent;

[0007] Obtaining measurement results of each non-contact sensor when the hybrid line is operating normally, constructing a decoupling matrix M, and solving the decoupling matrix M according to the measurement results to obtain specific values ​​of the decoupling matrix M;

[0008] Substituting the specific value of the decoupling matrix M into the calculation formula of the sensor measurement voltage, respectively calculating the measurement voltage of each non-contact sensor when the operating voltage of the single-phase, two-phase and three-phase cable terminals is a preset overvoltage value, selecting the minimum value from the obtained measurement voltage calculation results as the overvoltage trigger threshold, and setting the trigger mode to rising edge trigger;

[0009] When the voltage measured by any non-contact sensor exceeds the trigger threshold, the overvoltage value of the corresponding cable terminal is calculated using the decoupling matrix M and the voltage measured by the non-contact sensor.

[0010] According to an achievable manner of the first aspect of the present invention, constructing a decoupling matrix M and solving the decoupling matrix M according to the measurement result includes:

[0011] The decoupling matrix M is constructed as:

[0012]

[0013] Where M1, M2, and M3 are the elements of the decoupling matrix M;

[0014] Solve the decoupling matrix M according to the following formula:

[0015]

[0016] Where U is the operating voltage of the hybrid line, ω0 is the angular frequency at the power frequency, is the initial phase of the output signal of the non-contact sensor, is the output voltage of the first sensor, is the output voltage of the second sensor, is the output voltage of the third sensor.

[0017] According to an achievable manner of the first aspect of the present invention, the method includes:

[0018] The calculation formula for setting the sensor measurement voltage is:

[0019]

[0020] Where U a is the voltage at the A phase cable terminal, U b is the voltage at the B-phase cable terminal, U c is the voltage at the C phase cable terminal.

[0021] According to an achievable manner of the first aspect of the present invention, the method of calculating the overvoltage value of the corresponding cable terminal using the decoupling matrix M and the voltage measured by the non-contact sensor includes:

[0022] Calculate the overvoltage value at the corresponding cable terminal according to the following formula:

[0023]

[0024] Where U a (t) is the overvoltage at the A phase cable terminal, U b (t) is the overvoltage at the B phase cable terminal, U c (t) is the overvoltage at the C phase cable terminal.

[0025] A second aspect of the present invention provides a non-contact measurement system for hybrid line overvoltage, comprising:

[0026] A plurality of non-contact sensors, including a first sensor for detecting an A-phase cable terminal, a second sensor for detecting a B-phase cable terminal, and a third sensor for detecting a C-phase cable terminal, wherein the first sensor, the second sensor, and the third sensor are installed at the same position relative to the corresponding cable terminal;

[0027] The data acquisition device comprises a data acquisition module; the data acquisition module is used to obtain the measurement results of each non-contact sensor when a hybrid line is operating normally, construct a decoupling matrix M, and solve the decoupling matrix M according to the measurement results to obtain the specific value of the decoupling matrix M; the specific value of the decoupling matrix M is substituted into the calculation formula of the sensor measurement voltage, and the measurement voltage of each non-contact sensor of the single-phase, two-phase and three-phase cable terminals is calculated respectively when the operating voltage is a preset overvoltage value, the minimum value is selected from the obtained measurement voltage calculation results as the trigger threshold of the overvoltage, and the trigger mode is set to rising edge trigger; when the voltage measured by any non-contact sensor exceeds the trigger threshold, the overvoltage value of the corresponding cable terminal is calculated using the decoupling matrix M and the voltage measured by the non-contact sensor.

[0028] According to an achievable manner of the second aspect of the present invention, the data acquisition module is specifically used for:

[0029] The decoupling matrix M is constructed as:

[0030]

[0031] Where M1, M2, and M3 are the elements of the decoupling matrix M;

[0032] Solve the decoupling matrix M according to the following formula:

[0033]

[0034] Where U is the operating voltage of the hybrid line, ω0 is the angular frequency at the power frequency, is the initial phase of the output signal of the non-contact sensor, is the output voltage of the first sensor, is the output voltage of the second sensor, is the output voltage of the third sensor.

[0035] According to an achievable manner of the second aspect of the present invention, the data acquisition module is further specifically used for:

[0036] The calculation formula for setting the sensor measurement voltage is:

[0037]

[0038] Where U a is the voltage at the A phase cable terminal, U b is the voltage at the B-phase cable terminal, U c is the voltage at the C phase cable terminal.

[0039] According to an achievable manner of the second aspect of the present invention, the data acquisition module is further specifically used for:

[0040] Calculate the overvoltage value at the corresponding cable terminal according to the following formula:

[0041]

[0042] Where U a (t) is the overvoltage at the A phase cable terminal, U b (t) is the overvoltage at the B phase cable terminal, U c (t) is the overvoltage at the C phase cable terminal.

[0043] According to an achievable manner of the second aspect of the present invention, the non-contact sensor includes:

[0044] Plate capacitors, integrating resistors and integrators;

[0045] One end of the flat plate capacitor is grounded, and the other end is connected to one end of the integrating resistor and one end of the integrator through a coaxial line. The other end of the integrating resistor is grounded, and the other end of the integrator is connected to the data acquisition device.

[0046] According to an achievable manner of the second aspect of the present invention, the flat plate capacitor includes:

[0047] Opposite to the upper metal plate electrode and the lower metal plate electrode placed in parallel;

[0048] The plate capacitor is used to couple the measured voltage to obtain a voltage signal according to the following formula:

[0049]

[0050] Where U′(t) represents the voltage signal obtained by the plate capacitor coupling, U Hv (t) represents the measured voltage, τ dif =R m C E , R m is the resistance value of the integral resistor, C E is the capacitance of the lower metal plate electrode to ground;

[0051] The integrator is used to integrate the voltage signal according to the following formula to obtain an output signal:

[0052] u(t)=τ int ∫U′(t)dt

[0053] Where u(t) represents the output signal processed by the integrator, τ int is the coefficient determined by the integrator.

[0054] According to an achievable manner of the second aspect of the present invention, the system further includes:

[0055] A solar power generation device, comprising one or more solar panels for obtaining electrical energy;

[0056] The data acquisition device further comprises an energy storage module, and the energy storage module is used to store the electric energy obtained by the solar cell panel.

[0057] It can be seen from the above technical solutions that the present invention has the following advantages:

[0058] The present invention measures the electric field signal of the cable terminal of the overhead hybrid cable line by using a sensor under non-contact conditions, and obtains the voltage value of each phase of the cable terminal by using a decoupling method, wherein the decoupling method obtains a decoupling matrix M by using the known cable terminal phase voltage and the measurement result of the sensor under steady state, and calculates the measurement value of the sensor under overvoltage according to the calculation result of the decoupling matrix M, and uses the calculated measurement value as the trigger threshold of the overvoltage, and after the sensor captures the voltage signal, substitutes the captured voltage signal into the decoupling equation to obtain the overvoltage of the corresponding cable terminal; the present invention obtains the electric field signal by using a non-contact sensor, can realize non-contact measurement, ensures that the state of the original running line will not be disturbed, and can realize installation without power outage, decouples the measurement result by using the decoupling method, can accurately obtain the overvoltage condition of each phase on the measured cable terminal, and improves the accuracy of overvoltage measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0060] Figure 1 A flow chart of a non-contact measurement method for hybrid line overvoltage provided by an optional embodiment of the present invention;

[0061] Figure 2 A schematic diagram of the installation of a non-contact sensor provided by an optional embodiment of the present invention; Description of the drawings:

[0063] 1-first sensor; 2-second sensor; 3-third sensor; 4-A phase cable terminal; 5-B phase cable terminal; 6-C phase cable terminal; 7-data acquisition device. DETAILED DESCRIPTION

[0064] The embodiment of the present invention provides a non-contact measurement method and system for hybrid line overvoltage, which is used to solve the technical problems of low measurement accuracy and inconvenient installation in the conventional method of using voltage transformer to measure overvoltage.

[0065] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] See also Figure 1 , Figure 1 A flow chart of a non-contact measurement method for hybrid line overvoltage provided by an embodiment of the present invention is shown.

[0067] The present invention provides a non-contact measurement method for hybrid line overvoltage, comprising steps S1-S4.

[0068] Step S1, setting various non-contact sensors on the hybrid line, wherein each non-contact sensor includes a first sensor 1 for detecting the A-phase cable terminal 4, a second sensor 2 for detecting the B-phase cable terminal 5, and a third sensor 3 for detecting the C-phase cable terminal 6. When setting, the first sensor 1, the second sensor 2 and the third sensor 3 are installed in the same position relative to the corresponding cable terminal.

[0069] In a specific implementation, the contactless sensor is a capacitive sensor. Due to the inherent characteristics of the capacitive sensor, it will couple to the electric field from all over the space, which will affect the sensor's detection results for the target detection object. For example, the target detection object of the first sensor 1 is the A-phase cable terminal 4, and due to the coupling characteristics of the sensor itself, the first sensor 1 will not only couple the electric field from the A-phase cable terminal 4, but also couple the electric field from the B-phase cable terminal 5 and the C-phase cable terminal 6. At this time, the signal output by the first sensor 1 is the overall result of the sensor coupling all electric fields, and the second sensor 2 and the third sensor 3 are the same. Therefore, it is necessary to decouple the detection results to obtain the detection results of each non-contact sensor for the detection target. The decoupling method of the present invention is carried out by the following steps.

[0070] The embodiment of the present invention obtains electric field signals through non-contact sensors, which can achieve non-contact measurement, ensure that the state of the original running line will not be disturbed, and can achieve installation without power outage.

[0071] When installing the non-contact sensor, you can follow Figure 2 Install it as shown. Figure 2 As shown, since the installation positions of the first sensor 1, the second sensor 2 and the third sensor 3 relative to the corresponding cable terminals are consistent, the distance between the first sensor 1 and the A-phase cable terminal 4, the distance between the second sensor 2 and the B-phase cable terminal 5, and the distance between the third sensor 3 and the C-phase cable terminal 6 are the same. The first sensor 1, the second sensor 2 and the third sensor 3 are all connected to the data acquisition device 7, which is used to perform the following steps S2-S4.

[0072] Step S2, obtaining measurement results of each non-contact sensor when the hybrid line operates normally, constructing a decoupling matrix M, and solving the decoupling matrix M according to the measurement results to obtain specific values ​​of the decoupling matrix M.

[0073] The relationship between the cable voltage of the cable overhead line hybrid line and the output voltage of the non-contact sensor can be expressed as:

[0074]

[0075] in

[0076]

[0077] In the formula, is the output voltage of the first sensor 1, is the output voltage of the second sensor 2, is the output voltage of the third sensor 3, U a (t) is the overvoltage at the A phase cable terminal 4, U b (t) is the overvoltage at the B-phase cable terminal 5, U c (t) is the overvoltage at the C phase cable terminal 6, M 1a is the coupling coefficient between the first sensor 1 and the A-phase cable terminal 4, M 1b is the coupling coefficient between the first sensor 1 and the B-phase cable terminal 5, M 1c is the coupling coefficient between the first sensor 1 and the C-phase cable terminal 6, M 2a is the coupling coefficient between the second sensor 2 and the A-phase cable terminal 4, M 2b is the coupling coefficient between the second sensor 2 and the B-phase cable terminal 5, M 2c is the coupling coefficient between the second sensor 2 and the C-phase cable terminal 6, M 3ais the coupling coefficient between the third sensor 3 and the A-phase cable terminal 4, M 3b is the coupling coefficient between the third sensor 3 and the B-phase cable terminal 5, M 3c is the coupling coefficient between the third sensor 3 and the C-phase cable terminal 6;

[0078] When the three-phase circuit parameters are symmetrical, the voltage at the cable terminal can be expressed as:

[0079]

[0080] Where U is the operating voltage of the hybrid line, ω0 is the angular frequency at the power frequency;

[0081] From the above formula, it can be seen that when the three-phase circuit is symmetrical, the relationship between the cable voltage of the cable overhead line hybrid line and the output voltage of the non-contact sensor can be expressed as:

[0082]

[0083] Since the decoupling matrix M is a constant matrix and the cable terminal voltage is a symmetrical power frequency AC voltage, the output voltage of the non-contact sensor can be expressed as:

[0084]

[0085] Among them, the unknown parameter a i , b i and The output signal can be fitted with a sine function to obtain the solution.

[0086] Since the installation positions of the first sensor 1, the second sensor 2 and the third sensor 3 relative to the corresponding cable terminal are consistent, the decoupling matrix M is a symmetric matrix symmetric about the main diagonal, that is, the decoupling matrix M is consistent. At this time, the decoupling matrix M can be expressed as:

[0087]

[0088] The diagonal elements in the decoupling matrix M 1a 、M 2b 、M 3c Represents the coupling coefficient between each phase terminal and its corresponding sensor; M in the decoupling matrix 1b and M 2c , respectively represent the coupling coefficient of the first sensor 1 to the B-phase cable terminal 5 and the coupling coefficient of the second sensor 2 to the A-phase cable terminal 4. Therefore, when the installation positions of the cable terminals of each phase and the non-contact sensor are consistent, M is satisfied. 1a =M 2b =M 3c , M 1b =M 2c.

[0089] To sum up, in the specific implementation, the decoupling matrix M is constructed as:

[0090]

[0091] According to the relationship between the cable voltage of the cable overhead line hybrid line and the output voltage of the non-contact sensor under the condition of three-phase circuit symmetry, the solution equation of the decoupling matrix M can be set as:

[0092]

[0093] In the formula, It is the initial phase of the output signal of the non-contact sensor.

[0094] The fitting results of the monitoring values ​​under normal operation of the line Substituting the operating voltage U into the above formula, we can get the specific value of each element in the decoupling matrix M. If it is known that the line is operating at the rated state during the test, we can set U = 1. At this time, the calculated results of each element in the decoupling matrix M are the results under the per-unit value.

[0095] Step S3, substitute the specific value of the decoupling matrix M into the calculation formula of the sensor measurement voltage, calculate the measurement voltage of each non-contact sensor of the single-phase, two-phase and three-phase cable terminals when the operating voltage is a preset overvoltage value, select the minimum value from the obtained measurement voltage calculation results as the overvoltage trigger threshold, and set the trigger mode to rising edge trigger.

[0096] Among them, according to the relationship between the cable voltage of the cable overhead line hybrid line and the output voltage of the non-contact sensor under the condition of symmetry of the three-phase circuit, the calculation formula of the sensor measurement voltage can be set as:

[0097]

[0098] Where U a is the voltage at the A phase cable terminal 4, U b is the voltage at the B phase cable terminal 5, U c is the voltage at terminal 6 of phase C cable.

[0099] Preferably, the preset overvoltage value can be set to 1.1 times the rated operating voltage.

[0100] Step S4: when the voltage measured by any non-contact sensor exceeds the trigger threshold, the overvoltage value of the corresponding cable terminal is calculated using the decoupling matrix M and the voltage measured by the non-contact sensor.

[0101] In one achievable manner, the method of calculating the overvoltage value of the corresponding cable terminal using the decoupling matrix M and the voltage measured by the non-contact sensor includes:

[0102] Calculate the overvoltage value at the corresponding cable terminal according to the following formula:

[0103]

[0104] Where U a (t) is the overvoltage at the A phase cable terminal 4, U b (t) is the overvoltage at the B-phase cable terminal 5, U c (t) is the overvoltage at the C phase cable terminal 6.

[0105] By decoupling the measurement result through the decoupling method of the above embodiment, the overvoltage condition of each phase on the measured cable terminal can be accurately obtained, thereby improving the accuracy of overvoltage measurement.

[0106] The present invention also provides a non-contact measurement system for hybrid line overvoltage, comprising:

[0107] A plurality of non-contact sensors, including a first sensor 1 for detecting an A-phase cable terminal 4, a second sensor 2 for detecting a B-phase cable terminal 5, and a third sensor 3 for detecting a C-phase cable terminal 6, wherein the first sensor 1, the second sensor 2, and the third sensor 3 are installed at the same position relative to the corresponding cable terminal;

[0108] The data acquisition device 7 includes a data acquisition module; the data acquisition module is used to obtain the measurement results of each non-contact sensor when the hybrid line is operating normally, construct a decoupling matrix M, and solve the decoupling matrix M according to the measurement results to obtain the specific value of the decoupling matrix M; the specific value of the decoupling matrix M is substituted into the calculation formula of the sensor measurement voltage, and the measurement voltage of each non-contact sensor of the single-phase, two-phase and three-phase cable terminals is calculated respectively when the operating voltage is a preset overvoltage value, and the minimum value is selected from the obtained measurement voltage calculation results as the overvoltage trigger threshold, and the trigger mode is set to rising edge trigger; when the voltage measured by any non-contact sensor exceeds the trigger threshold, the overvoltage value of the corresponding cable terminal is calculated using the decoupling matrix M and the voltage measured by the non-contact sensor.

[0109] Wherein, a data acquisition card can be arranged in the data acquisition module to sample the signal measured by the non-contact sensor.

[0110] The data acquisition device 7 may also include a data transmission module for transmitting the calculated overvoltage value of the corresponding cable terminal to a preset processing platform, such as a control center.

[0111] In one achievable manner, the data acquisition module is specifically used for:

[0112] The decoupling matrix M is constructed as:

[0113]

[0114] Where M1, M2, and M3 are the elements of the decoupling matrix M;

[0115] Solve the decoupling matrix M according to the following formula:

[0116]

[0117] Where U is the operating voltage of the hybrid line, ω0 is the angular frequency at the power frequency, is the initial phase of the output signal of the non-contact sensor, is the output voltage of the first sensor 1, is the output voltage of the second sensor 2, is the output voltage of the third sensor 3.

[0118] In one achievable manner, the data acquisition module is further specifically used for:

[0119] The calculation formula for setting the sensor measurement voltage is:

[0120]

[0121] Where U a is the voltage at the A phase cable terminal 4, U b is the voltage at the B phase cable terminal 5, U c is the voltage at terminal 6 of phase C cable.

[0122] In one achievable manner, the data acquisition module is further specifically used for:

[0123] Calculate the overvoltage value at the corresponding cable terminal according to the following formula:

[0124]

[0125] Where U a (t) is the overvoltage at the A phase cable terminal 4, U b (t) is the overvoltage at the B-phase cable terminal 5, U c (t) is the overvoltage at the C phase cable terminal 6.

[0126] In one achievable manner, the non-contact sensor includes:

[0127] Plate capacitors, integrating resistors and integrators;

[0128] One end of the flat plate capacitor is grounded, and the other end is connected to one end of the integrating resistor and one end of the integrator through a coaxial line. The other end of the integrating resistor is grounded, and the other end of the integrator is connected to the data acquisition device 7.

[0129] In one achievable manner, the flat plate capacitor includes:

[0130] Opposite to the upper metal plate electrode and the lower metal plate electrode placed in parallel;

[0131] The plate capacitor is used to couple the measured voltage to obtain a voltage signal according to the following formula:

[0132]

[0133] Where U′(t) represents the voltage signal obtained by the plate capacitor coupling, U Hv (t) represents the measured voltage, τ dif =R m C E , R m is the resistance value of the integral resistor, C E is the capacitance of the lower metal plate electrode to ground;

[0134] The integrator is used to integrate the voltage signal according to the following formula to obtain an output signal:

[0135] u(t)=τ int ∫U′(t)dt

[0136] Where u(t) represents the output signal processed by the integrator, τ int is the coefficient determined by the integrator.

[0137] In one implementation, the system further includes:

[0138] A solar power generation device, comprising one or more solar panels for obtaining electrical energy;

[0139] The data acquisition device 7 further comprises an energy storage module, and the energy storage module is used to store the electric energy obtained by the solar cell panel.

[0140] In a specific implementation, the energy storage module may include an energy storage control unit and a battery. The energy storage control unit is used to control the charging and discharging of the battery. The battery is used to store the electrical energy obtained by the solar panel.

[0141] By setting up solar power generation devices and energy storage modules, uninterrupted monitoring of overvoltage at the hybrid line cable terminal can be achieved.

[0142] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes and effects of the systems and modules described above can refer to the corresponding processes and effects in the aforementioned method embodiments, and will not be repeated here.

[0143] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A non-contact measurement method for hybrid line overvoltage, characterized in that: include: Non-contact sensors are arranged on the hybrid line, wherein each non-contact sensor includes a first sensor for detecting a cable terminal of phase A, a second sensor for detecting a cable terminal of phase B, and a third sensor for detecting a cable terminal of phase C, and the first sensor, the second sensor, and the third sensor are arranged so that the installation positions of the first sensor, the second sensor, and the third sensor relative to the corresponding cable terminal are consistent; Obtaining measurement results of each non-contact sensor when the hybrid line is operating normally, constructing a decoupling matrix M, and solving the decoupling matrix M according to the measurement results to obtain specific values ​​of the decoupling matrix M; Substituting the specific value of the decoupling matrix M into the calculation formula of the sensor measurement voltage, respectively calculating the measurement voltage of each non-contact sensor when the operating voltage of the single-phase, two-phase and three-phase cable terminals is a preset overvoltage value, selecting the minimum value from the obtained measurement voltage calculation results as the overvoltage trigger threshold, and setting the trigger mode to rising edge trigger; When the voltage measured by any non-contact sensor exceeds the trigger threshold, the overvoltage value of the corresponding cable terminal is calculated using the decoupling matrix M and the voltage measured by the non-contact sensor.

2. The non-contact measurement method for hybrid line overvoltage according to claim 1, characterized in that: The constructing a decoupling matrix M and solving the decoupling matrix M according to the measurement results includes: The decoupling matrix M is constructed as: Where M1, M2, and M3 are the elements of the decoupling matrix M; Solve the decoupling matrix M according to the following formula: Where U is the operating voltage of the hybrid line, ω0 is the angular frequency at the power frequency, is the initial phase of the output signal of the non-contact sensor, is the output voltage of the first sensor, is the output voltage of the second sensor, is the output voltage of the third sensor.

3. The non-contact measurement method for hybrid line overvoltage according to claim 2, characterized in that: The method comprises: The calculation formula for setting the sensor measurement voltage is: Where U a is the voltage at the A phase cable terminal, U b is the voltage at the B-phase cable terminal, U c is the voltage at the C phase cable terminal.

4. The non-contact measurement method for hybrid line overvoltage according to claim 2, characterized in that: The method of calculating the overvoltage value of the corresponding cable terminal using the decoupling matrix M and the voltage measured by the non-contact sensor includes: Calculate the overvoltage value at the corresponding cable terminal according to the following formula: Where U a (t) is the overvoltage at the A phase cable terminal, U b (t) is the overvoltage at the B phase cable terminal, U c (t) is the overvoltage at the C phase cable terminal.

5. A non-contact measurement system for hybrid line overvoltage, characterized in that: include: A plurality of non-contact sensors, including a first sensor for detecting an A-phase cable terminal, a second sensor for detecting a B-phase cable terminal, and a third sensor for detecting a C-phase cable terminal, wherein the first sensor, the second sensor, and the third sensor are installed at the same position relative to the corresponding cable terminal; A data acquisition device, comprising a data acquisition module; The data acquisition module is used to obtain the measurement results of each non-contact sensor when the hybrid line is operating normally, construct a decoupling matrix M, and solve the decoupling matrix M according to the measurement results to obtain the specific value of the decoupling matrix M; substitute the specific value of the decoupling matrix M into the calculation formula of the sensor measurement voltage, calculate the measurement voltage of each non-contact sensor when the operating voltage of the single-phase, two-phase and three-phase cable terminals is a preset overvoltage value, select the minimum value from the obtained measurement voltage calculation results as the overvoltage trigger threshold, and set the trigger mode to rising edge trigger; when the voltage measured by any non-contact sensor exceeds the trigger threshold, use the decoupling matrix M and the voltage measured by the non-contact sensor to calculate the overvoltage value of the corresponding cable terminal.

6. The non-contact measurement system for hybrid line overvoltage according to claim 5, characterized in that: The data acquisition module is specifically used for: The decoupling matrix M is constructed as: Where M1, M2, and M3 are the elements of the decoupling matrix M; Solve the decoupling matrix M according to the following formula: Where U is the operating voltage of the hybrid line, ω0 is the angular frequency at the power frequency, is the initial phase of the output signal of the non-contact sensor, is the output voltage of the first sensor, is the output voltage of the second sensor, is the output voltage of the third sensor.

7. The non-contact measurement system for hybrid line overvoltage according to claim 6, characterized in that: The data acquisition module is also specifically used for: The calculation formula for setting the sensor measurement voltage is: Where U a is the voltage at the A phase cable terminal, U b is the voltage at the B-phase cable terminal, U c is the voltage at the C phase cable terminal.

8. The non-contact measurement system for hybrid line overvoltage according to claim 6, characterized in that: The data acquisition module is also specifically used for: Calculate the overvoltage value at the corresponding cable terminal according to the following formula: Where U a (t) is the overvoltage at the A phase cable terminal, U b (t) is the overvoltage at the B phase cable terminal, U c (t) is the overvoltage at the C phase cable terminal.

9. The non-contact measurement system for hybrid line overvoltage according to claim 5, characterized in that: The non-contact sensor comprises: Plate capacitors, integrating resistors and integrators; One end of the flat plate capacitor is grounded, and the other end is connected to one end of the integrating resistor and one end of the integrator through a coaxial line. The other end of the integrating resistor is grounded, and the other end of the integrator is connected to the data acquisition device.

10. The non-contact measurement system for hybrid line overvoltage according to claim 9, characterized in that: The flat plate capacitor comprises: Opposite to the upper metal plate electrode and the lower metal plate electrode placed in parallel; The plate capacitor is used to couple the measured voltage to obtain a voltage signal according to the following formula: Where U′(t) represents the voltage signal obtained by the plate capacitor coupling, U Hv (t) represents the measured voltage, τ dif =R m C E , R m is the resistance value of the integral resistor, C E is the capacitance of the lower metal plate electrode to ground; The integrator is used to integrate the voltage signal according to the following formula to obtain an output signal: u(t)=τ int ∫U′(t)dt Where u(t) represents the output signal processed by the integrator, τ int is the coefficient determined by the integrator.

11. The non-contact measurement system for hybrid line overvoltage according to claim 5, characterized in that: Also includes: A solar power generation device, comprising one or more solar panels for obtaining electrical energy; The data acquisition device further comprises an energy storage module, and the energy storage module is used to store the electric energy obtained by the solar cell panel.

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