Non-contact voltage measurement method suitable for distribution transformer area and related equipment

Abstract

The invention discloses a non-contact voltage measurement method suitable for a distribution station area, which comprises the following steps: designing a single-phase line sensor structure, applying the single-phase line sensor structure to the distribution station area, determining coupling capacitance needing to be considered, and drawing a sensor equivalent circuit when a three-phase line of a low-voltage distribution station area runs; the relation between the adjacent-phase inner-layer copper electrode and the interval-phase inner-layer copper electrode is explored, and a three-phase line response voltage equation is deduced according to a sensor equivalent circuit when the three-phase line of the low-voltage distribution and utilization station area runs; simplifying the response voltage equation, and solving a coefficient matrix in the equation; and measuring internal and external copper interpolar voltage of each phase sensor, and substituting the voltage into the equation to inversely deduce line voltage. The three-phase line voltage is reversely deduced after the divided voltage between the inner and outer copper sheets of each phase of coupling mechanism is measured, equipment does not need to be installed in a power-off mode, and the problem that power-off construction is needed when voltage data are collected at present is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage measurement in a distribution station area, and in particular to a non-contact voltage measurement method and related equipment applicable to a distribution station area. Background Art

[0002] In the power system, line voltage, as a basic data, plays a very important role in many engineering projects and theoretical research. At present, the voltage measurement method commonly used in medium-voltage power grids is to use traditional voltage transformers. However, the traditional electromagnetic voltage transformers and capacitive voltage transformers have disadvantages such as large size, high price, complex insulation structure, and difficult installation, which greatly limits the application scenarios of traditional voltage transformers.

[0003] In the distribution station area, voltage and current metering and collection play a vital role in the actual electrical engineering application. At present, in the field of electrical quantity sensing and detection, the non-contact measurement method of current has been relatively mature, such as using Rogowski coils or Hall sensors to measure the magnetic field around the wire to obtain the wire current. However, in the field of voltage measurement, especially in the 220 / 380V low-voltage distribution network, due to the lack of mature non-contact voltage measurement methods, when it is necessary to collect voltage data at a certain point, most of them use power outage construction, connect smart meters or electric energy information collection terminals on the line to obtain the required voltage, power, harmonic content and other key information. This method of installation that requires power outage limits the large-scale deployment of voltage sensors in the power system. Power workers cannot complete the voltage measurement of the distribution station area without power outage, which makes the detection efficiency of the distribution station area low. Summary of the invention

[0004] Based on the problems raised by the above background technology, the purpose of the present invention is to provide a non-contact voltage measurement method and related equipment suitable for the distribution station area. By measuring the voltage division between the inner and outer copper layers of each phase coupling mechanism and then reversely calculating the three-phase line voltage, it does not need to cut off power to install the equipment, thus overcoming the current problem that power outage construction is required to collect voltage data at a certain point, and the voltage in the distribution station area cannot be measured.

[0005] The present invention is achieved through the following technical solutions:

[0006] The first aspect of the present invention provides a non-contact voltage measurement method applicable to a radio station area, comprising the following steps:

[0007] Step 1: Design a single-phase line sensor, configure a single-phase line sensor for each of the three-phase lines in the distribution station area, and establish an equivalent circuit of each single-phase line sensor when the three-phase line is running;

[0008] Step 2: Based on the relationship between the inner copper poles of adjacent phases and the inner copper poles of alternate phases, derive the response voltage equation of the three-phase line according to the equivalent circuit;

[0009] Step 3: Measure the voltage between the inner and outer copper electrodes of each phase line sensor, and substitute the voltage between the inner and outer copper electrodes into the response voltage equation to obtain the line voltage.

[0010] In the above technical solution, a single-phase line sensor for measuring the single-phase line voltage is first designed. The single-phase line sensor uses the insulation layer of the conductor as a dielectric to construct a capacitor, realize voltage division, and realize the collection of the single-phase line voltage. Then, a line sensor is configured for each of the three-phase lines in the distribution station area. When the three-phase line is running, an equivalent circuit of three single-phase line sensors is established. The equivalent circuit takes into account the sensors of each phase and the interaction between them, and can be used to deduce the relationship between the lines and the coupling capacitance between the lines.

[0011] The relationship between the inner copper poles of adjacent phases and the inner copper poles of the interval phases can represent the capacitance relationship between the single-phase line sensors, which is only related to the position of the three-phase line. Based on the above relationship, combined with the equivalent circuit obtained in step 1, the response voltage equation of the three-phase line can be derived. The response voltage equation of the three-phase line can be used to explore the measurement relationship between the single-phase line sensors of each phase.

[0012] Measure the voltage between the inner and outer copper electrodes of each phase line sensor, substitute the measured voltage value between the inner and outer copper electrodes into the simplified response voltage equation, and solve it to obtain the line voltage. It can provide a non-contact voltage measurement solution suitable for three-phase lines with high safety and convenience. Through precise sensor design and signal processing, the accuracy and reliability of measurement can be improved. It can obtain the line voltage of the distribution station area by reverse calculation only through the relationship between the three-phase lines and the voltage between the inner and outer copper electrodes of each phase line sensor without power failure.

[0013] In an optional embodiment, the single-phase line sensor includes an inner cylindrical copper pole and an outer cylindrical copper pole, the inner cylindrical copper pole and the outer cylindrical copper pole are equal in length, and the radius of the outer cylindrical copper pole is 4 mm larger than the radius of the inner cylindrical copper pole; the material between the inner cylindrical copper pole and the outer cylindrical copper pole is polyvinyl chloride, and there is air between the inner cylindrical copper pole and the line.

[0014] In an optional embodiment, based on the relationship between the inner copper poles of adjacent phases and the inner copper poles of alternate phases, the response voltage equation of the three-phase line is derived according to the equivalent circuit, including the following steps:

[0015] Step 2.1: According to the installation method of the three-phase line, determine the relationship between the inner copper pole coupling capacitances of the single-phase line sensors of each phase;

[0016] Step 2.2: Based on the relationship between the coupling capacitances of the inner copper electrodes of the single-phase line sensors of each phase, the relationship between capacitance and voltage is established using the node voltage method;

[0017] Step 2.3: Integrate the relationship between the capacitance and voltage of the three-phase line to obtain the response voltage equation.

[0018] In an optional embodiment, the three-phase line installation method includes: an equilateral triangle installation method and a horizontal installation method;

[0019] When the three-phase line is installed in a regular triangle, the coupling capacitance between the inner copper electrodes of the sensors of each phase of the single-phase line is approximately equal;

[0020] When the three-phase line is installed in a horizontal manner, the inner copper inter-electrode coupling capacitance of the separated phase line sensor is k times the inner copper inter-electrode coupling capacitance of the adjacent phase line sensor; wherein k is a constant.

[0021] In an optional embodiment, the response voltage equation is expressed as follows:

[0022]

[0023] Among them, U A1 , U B1 , U C1 The inner copper electrode potentials of phase A, phase B, and phase C are respectively A1 , C A2 The capacitance of the single-phase line sensor of phase A, C B1 , C B2 The capacitance of the single-phase line sensor of phase B, C C1 , C C2 The capacitance of the single-phase line sensor is C phase, U A , U B , U C The line voltages of phase A, phase B, and phase C are respectively AB , C BC , C AC It is the coupling capacitance between the copper electrodes in the single-phase line sensor in phases A, B, and C.

[0024] In an optional embodiment, before step 3, the method further includes: simplifying the response voltage equation based on the installation method of the three-phase line.

[0025] In an optional embodiment, measuring the voltage between the inner and outer copper electrodes of each phase line sensor and substituting the voltage between the inner and outer copper electrodes into the response voltage equation includes the following steps:

[0026] Step 3.1: Solve the coefficient matrix in the response voltage equation using the least square method;

[0027] Step 3.2: Obtain the three-phase line voltage and the voltage between the inner and outer copper poles of each phase line sensor. If the coefficient matrix is ​​full, substitute the three-phase line voltage and the voltage between the inner and outer copper poles of each phase line sensor into the response voltage equation to obtain the three-phase line voltage value of the matching station area.

[0028] A second aspect of the present invention provides a non-contact voltage measurement system for a radio area, comprising:

[0029] An equivalent module is used to design a single-phase line sensor, configure a single-phase line sensor for each of the three-phase lines in the distribution station area, and establish an equivalent circuit of each single-phase line sensor when the three-phase line is in operation;

[0030] A response module, configured to derive a response voltage equation of the three-phase line according to the equivalent circuit based on a relationship between inner copper poles of adjacent phases and inner copper poles of alternate phases;

[0031] The calculation module is used to measure the voltage between the inner and outer copper electrodes of each phase line sensor, and to bring the voltage between the inner and outer copper electrodes into the response voltage equation to obtain the line voltage.

[0032] A third aspect of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a non-contact voltage measurement method applicable to a radio station area is implemented.

[0033] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a non-contact voltage measurement method applicable to a radio station area.

[0034] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0035] The present invention provides a non-contact voltage measurement solution, which is suitable for three-phase lines and has high safety and convenience. Through precise sensor design and signal processing, the accuracy and reliability of measurement can be improved. Without power failure, the line voltage of the distribution station area can be obtained by reverse calculation only through the relationship between the three-phase lines and the voltage between the inner and outer copper poles of the sensors of each phase line. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0037] Figure 1 A flow chart of a non-contact voltage measurement method applicable to a radio area provided in Embodiment 1 of the present invention;

[0038] Figure 2 An equivalent circuit diagram of a single-phase line sensor provided in Example 1 of the present invention;

[0039] Figure 3 An equivalent circuit diagram between the three-phase line and the sensor when the three-phase line provided in Embodiment 1 of the present invention is in operation;

[0040] Figure 4 (a) and Figure 4 (b) is a schematic diagram of the structure of the three-phase line arrangement method provided in Example 1 of the present invention;

[0041] Figure 5 A schematic diagram of the structure of an electronic device provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0042] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0043] Example 1

[0044] Figure 1 A flow chart of a non-contact voltage measurement method applicable to a radio area provided in Embodiment 1 of the present invention is shown as follows: Figure 1 As shown, a non-contact voltage measurement method applicable to a radio area includes the following steps:

[0045] Step 1: Design a single-phase line sensor, configure a single-phase line sensor for each of the three-phase lines in the distribution station area, and establish an equivalent circuit of each single-phase line sensor when the three-phase line is running;

[0046] Step 2: Based on the relationship between the inner copper poles of adjacent phases and the inner copper poles of alternate phases, derive the response voltage equation of the three-phase line according to the equivalent circuit;

[0047] Step 3: Measure the voltage between the inner and outer copper electrodes of each phase line sensor, and substitute the voltage between the inner and outer copper electrodes into the response voltage equation to obtain the line voltage.

[0048] It should be noted that, in view of the problem that the prior art cannot measure the voltage in the distribution station area without power outage, the embodiment of the present invention proposes a non-contact voltage measurement method suitable for the distribution station area. The method first designs a single-phase line sensor for measuring the single-phase line voltage. The single-phase line sensor uses the insulation layer of the wire as a dielectric to construct a capacitor to achieve voltage division and realize the collection of the single-phase line voltage. Then, a line sensor is configured for each of the three-phase lines in the distribution station area. When the three-phase line is running, an equivalent circuit of three single-phase line sensors is established. The equivalent circuit takes into account the sensors of each phase and the interaction between them, and can be used to deduce the relationship between the lines and the coupling capacitance between the lines.

[0049] The relationship between the inner copper poles of adjacent phases and the inner copper poles of the interval phases can represent the capacitance relationship between the single-phase line sensors, which is only related to the position of the three-phase line. Based on the above relationship, combined with the equivalent circuit obtained in step 1, the response voltage equation of the three-phase line can be derived. The response voltage equation of the three-phase line can be used to explore the measurement relationship between the single-phase line sensors of each phase.

[0050] Measure the voltage between the inner and outer copper electrodes of each phase line sensor, substitute the measured voltage value between the inner and outer copper electrodes into the simplified response voltage equation, and solve it to obtain the line voltage. It can provide a non-contact voltage measurement solution suitable for three-phase lines with high safety and convenience. Through precise sensor design and signal processing, the accuracy and reliability of measurement can be improved. It can obtain the line voltage of the distribution station area by reverse calculation only through the relationship between the three-phase lines and the voltage between the inner and outer copper electrodes of each phase line sensor without power failure.

[0051] In an optional embodiment, the single-phase line sensor includes an inner cylindrical copper pole and an outer cylindrical copper pole, the inner cylindrical copper pole and the outer cylindrical copper pole are equal in length, and the radius of the outer cylindrical copper pole is 4 mm larger than the radius of the inner cylindrical copper pole; the material between the inner cylindrical copper pole and the outer cylindrical copper pole is polyvinyl chloride, and there is air between the inner cylindrical copper pole and the line.

[0052] It should be noted that the embodiment of the present invention constructs a single-phase line sensor suitable for use in a distribution station area. The measurement voltage of the single-phase line sensor constructed in this way is low voltage, and the outer cylindrical copper pole of the outer layer can be grounded. The single-phase line sensor is installed facing the three 400V lines in sequence. According to the structure of the single-phase line sensor, a single-phase equivalent measurement circuit can be established. The capacitance types that need to be considered between the single-phase line and the sensor are the coupling capacitance between the line and the inner copper pole, and the coupling capacitance between the inner and outer layers. Figure 2 As shown, taking phase A as an example, the single-phase line sensor includes a capacitor C A1 and capacitor C A2 When the sensor is applied to a three-phase line, since the outer copper pole is grounded, only the coupling capacitance between the inner copper poles needs to be considered between the sensors of each phase, such as Figure 3 As shown, in.

[0053] In an optional embodiment, based on the relationship between the inner copper poles of adjacent phases and the inner copper poles of alternate phases, the response voltage equation of the three-phase line is derived according to the equivalent circuit, including the following steps:

[0054] Step 2.1: According to the installation method of the three-phase line, determine the relationship between the inner copper pole coupling capacitances of the single-phase line sensors of each phase;

[0055] Step 2.2: Based on the relationship between the coupling capacitances of the inner copper electrodes of the single-phase line sensors of each phase, the relationship between capacitance and voltage is established using the node voltage method;

[0056] Step 2.3: Integrate the relationship between the capacitance and voltage of the three-phase line to obtain the response voltage equation.

[0057] In an optional embodiment, the three-phase line installation method includes: an equilateral triangle installation method and a horizontal installation method;

[0058] When the three-phase line is installed in a regular triangle, the coupling capacitance between the inner copper electrodes of the sensors of each phase of the single-phase line is approximately equal;

[0059] When the three-phase line is installed in a horizontal manner, the inner copper inter-electrode coupling capacitance of the separated phase line sensor is k times the inner copper inter-electrode coupling capacitance of the adjacent phase line sensor; wherein k is a constant.

[0060] It should be noted that the three-phase line arrangement in the distribution area has two types: equilateral triangle and horizontal. The installation method of the three-phase line determines the relative position of each single-phase line sensor. When three single-phase line sensors monitor the equilateral triangle circuit, their equivalent objects are as follows: Figure 4 As shown in (a), at this time, since the distance between the three-phase lines is the same, the coupling capacitance between the inner copper electrodes of the sensor is approximately equal, that is, C AB=C BC =C AC When three single-phase line sensors monitor a horizontal circuit, their equivalent physical counterparts are as follows: Figure 4 (b) shows that at this time, the distances between the A and B phase lines and the B and C phase lines are the same, so C AB =C BC The inner copper pole of the interval phase sensor and the adjacent phase sensor is k times, that is, C AB =C BC = k·C AC This k value is only related to the distance between sensors. When the measurement line is determined, this k value is a constant.

[0061] According to the equivalent circuit combined with different installation methods and the relationship between the coupling capacitance of the inner copper poles, the voltage equation between the three-phase line and each single-phase line sensor can be derived.

[0062] Specifically, the inner copper electrode potentials in the three-phase line are U A1 , U B1 , U C1 , the line voltage of the three-phase line is U A , U B , U C , then the relationship between capacitance and voltage can be obtained by using the node voltage method for phase A:

[0063] (C A1 +C A2 +C AC +C AB )·U A1 -C AB ·U B1 -C AC ·U C1 =C A1 ·U A

[0064] Similarly, the relationship between capacitance and voltage can be obtained by using the node voltage method for the B phase line:

[0065] (C B1 +C B2 +C AB +C BC )·U B1 -C AB ·U A1 -C BC ·U C1 =C B1 ·U B

[0066] Similarly, the relationship between capacitance and voltage can be obtained by using the node voltage method for the C phase line:

[0067] (C C1+C C2 +C AC +C BC )·U C1 -C AC ·U A1 -C BC ·U B1 =C C1 ·U C

[0068] In an optional embodiment, the response voltage equation is expressed as follows:

[0069]

[0070] Among them, U A1 , U B1 , U C1 The inner copper electrode potentials of phase A, phase B, and phase C are respectively A1 , C A2 The capacitance of the single-phase line sensor of phase A, C B1 , C B2 The capacitance of the single-phase line sensor of phase B, C C1 , C C2 The capacitance of the single-phase line sensor is C phase, U A , U B , U C The line voltages of phase A, phase B, and phase C are respectively AB , C BC , C AC It is the coupling capacitance between the copper electrodes in the single-phase line sensor in phases A, B, and C.

[0071] It should be noted that by sorting out the relationship between capacitance and voltage obtained by the node voltage method for the A phase line, the relationship between capacitance and voltage obtained by the node voltage method for the B phase line, and the relationship between capacitance and voltage obtained by the node voltage method for the C phase line, the response voltage equation can be obtained. The response voltage equation can be used to represent the relationship between the input voltage and the output voltage.

[0072] In an optional embodiment, before step 3, the method further includes: simplifying the response voltage equation based on the installation method of the three-phase line.

[0073] It should be noted that the simplified response voltage equation includes a coefficient matrix, an inner and outer copper pole voltage matrix, and a three-phase line voltage matrix, wherein the cross product of the coefficient matrix and the inner and outer copper pole voltage matrix is ​​equal to the three-phase line voltage matrix. The simplification of the embodiment of the present invention is based on the fact that the mutual capacitance between adjacent sensors is equal, and the expression of the simplified response voltage equation is as follows:

[0074]

[0075] In an optional embodiment, measuring the voltage between the inner and outer copper electrodes of each phase line sensor and substituting the voltage between the inner and outer copper electrodes into the response voltage equation includes the following steps:

[0076] Step 3.1: Solve the coefficient matrix in the response voltage equation using the least square method;

[0077] Step 3.2: Obtain the three-phase line voltage and the voltage between the inner and outer copper poles of each phase line sensor. If the coefficient matrix is ​​full, substitute the three-phase line voltage and the voltage between the inner and outer copper poles of each phase line sensor into the response voltage equation to obtain the three-phase line voltage value of the matching station area.

[0078] It should be noted that the formula for solving the coefficient matrix in the response voltage equation using the least squares method is as follows:

[0079] Coefficient matrix = three-phase line voltage matrix, inner and outer copper pole voltage matrix T ·(Inter-electrode voltage matrix of inner and outer copper layers·Inter-electrode voltage matrix of inner and outer copper layers T ) -1

[0080] Example 2

[0081] Embodiment 2 of the present invention provides a non-contact voltage measurement system applicable to a radio area, including:

[0082] An equivalent module is used to design a single-phase line sensor, configure a single-phase line sensor for each of the three-phase lines in the distribution station area, and establish an equivalent circuit of each single-phase line sensor when the three-phase line is running;

[0083] A response module, configured to derive a response voltage equation of the three-phase line according to the equivalent circuit based on a relationship between inner copper poles of adjacent phases and inner copper poles of alternate phases;

[0084] The calculation module is used to measure the voltage between the inner and outer copper electrodes of each phase line sensor, and to bring the voltage between the inner and outer copper electrodes into the response voltage equation to obtain the line voltage.

[0085] Example 3

[0086] Figure 5 A schematic diagram of the structure of an electronic device provided in Embodiment 3 of the present invention is shown in FIG. Figure 5 As shown, the electronic device includes a processor 21, a memory 22, an input device 23 and an output device 24; the number of processors 21 in the computer device can be one or more. Figure 5A processor 21 is taken as an example; the processor 21, the memory 22, the input device 23 and the output device 24 in the electronic device can be connected by a bus or other means. Figure 5 The example of connecting through bus is taken in the following.

[0087] The memory 22 is a computer-readable storage medium that can be used to store software programs, computer executable programs and modules. The processor 21 executes various functional applications and data processing of the electronic device by running the software programs, instructions and modules stored in the memory 22, that is, a non-contact voltage measurement method applicable to the radio area of ​​the embodiment 1 is implemented.

[0088] The memory 22 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required for a function; the data storage area may store data created according to the use of the terminal, etc. In addition, the memory 22 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 22 may further include a memory remotely arranged relative to the processor 21, and these remote memories may be connected to the electronic device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0089] The input device 23 can be used to receive the ID and password input by the user, etc. The output device 24 is used to output the network configuration page.

[0090] Example 4

[0091] Embodiment 4 of the present invention further provides a computer-readable storage medium, wherein the computer-executable instructions are used to implement a non-contact voltage measurement method applicable to a radio station area provided in Embodiment 1 when executed by a computer processor.

[0092] The storage medium containing computer executable instructions provided in the embodiment of the present invention is not limited to the method operations provided in Example 1, and can also execute related operations in a non-contact voltage measurement method applicable to a matching radio area provided in any embodiment of the present invention.

[0093] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A non-contact voltage measurement method suitable for use in a radio area, characterized in that: The steps include: Step 1: Design a single-phase line sensor, configure a single-phase line sensor for each of the three-phase lines in the distribution station area, and establish an equivalent circuit of each single-phase line sensor when the three-phase line is running; Step 2: Based on the relationship between the inner copper poles of adjacent phases and the inner copper poles of alternate phases, derive the response voltage equation of the three-phase line according to the equivalent circuit; Step 3: Measure the voltage between the inner and outer copper electrodes of each phase line sensor, and substitute the voltage between the inner and outer copper electrodes into the response voltage equation to obtain the line voltage.

2. A non-contact voltage measurement method applicable to a radio area according to claim 1, characterized in that: The single-phase line sensor comprises an inner cylindrical copper pole and an outer cylindrical copper pole, the inner cylindrical copper pole and the outer cylindrical copper pole are of equal length, and the radius of the outer cylindrical copper pole is 4 mm greater than the radius of the inner cylindrical copper pole; The material between the inner cylindrical copper pole and the outer cylindrical copper pole is polyvinyl chloride, and the space between the inner cylindrical copper pole and the circuit is air.

3. A non-contact voltage measurement method applicable to a radio area according to claim 2, characterized in that: Based on the relationship between the inner copper poles of adjacent phases and the inner copper poles of alternate phases, the response voltage equation of the three-phase line is derived according to the equivalent circuit, including the following steps: Step 2.1: According to the installation method of the three-phase line, determine the relationship between the inner copper pole coupling capacitances of the single-phase line sensors of each phase; Step 2.2: Based on the relationship between the coupling capacitances of the inner copper electrodes of the single-phase line sensors of each phase, the relationship between capacitance and voltage is established using the node voltage method; Step 2.3: Integrate the relationship between the capacitance and voltage of the three-phase line to obtain the response voltage equation.

4. A non-contact voltage measurement method applicable to a radio area according to claim 1, characterized in that: The three-phase line installation methods include: a regular triangle installation method and a horizontal installation method; When the three-phase line is installed in a regular triangle, the coupling capacitance between the inner copper electrodes of the sensors of each phase of the single-phase line is approximately equal; When the three-phase line is installed in a horizontal manner, the inner copper inter-electrode coupling capacitance of the separated phase line sensor is k times the inner copper inter-electrode coupling capacitance of the adjacent phase line sensor; wherein k is a constant.

5. A non-contact voltage measurement method applicable to a radio area according to claim 4, characterized in that: The response voltage equation is expressed as follows: Among them, U A1 , U B1 , U C1 The inner copper electrode potentials of phase A, phase B, and phase C are respectively A1 , C A2 The capacitance of the single-phase line sensor of phase A, C B1 , C B2 The capacitance of the single-phase line sensor of phase B, C C1 , C C2 The capacitance of the single-phase line sensor is C phase, U A , U B , U C The line voltages of phase A, phase B, and phase C are respectively AB , C BC , C AC It is the coupling capacitance between the copper electrodes in the single-phase line sensor in phases A, B, and C.

6. A non-contact voltage measurement method applicable to a radio area according to claim 1, characterized in that: Before step 3, the method further includes: simplifying the response voltage equation based on the installation method of the three-phase line.

7. A non-contact voltage measurement method applicable to a radio area according to claim 1, characterized in that: Measuring the voltage between the inner and outer copper electrodes of each phase line sensor and substituting the voltage between the inner and outer copper electrodes into the response voltage equation includes the following steps: Step 3.1: Solve the coefficient matrix in the response voltage equation using the least square method; Step 3.2: Obtain the three-phase line voltage and the voltage between the inner and outer copper poles of each phase line sensor. If the coefficient matrix is ​​full, substitute the three-phase line voltage and the voltage between the inner and outer copper poles of each phase line sensor into the response voltage equation to obtain the three-phase line voltage value of the matching station area.

8. A non-contact voltage measurement system suitable for use in radio stations, characterized in that: include: An equivalent module is used to design a single-phase line sensor, configure a single-phase line sensor for each of the three-phase lines in the distribution station area, and establish an equivalent circuit of each single-phase line sensor when the three-phase line is running; A response module, configured to derive a response voltage equation of the three-phase line according to the equivalent circuit based on a relationship between inner copper poles of adjacent phases and inner copper poles of alternate phases; The calculation module is used to measure the voltage between the inner and outer copper electrodes of each phase line sensor, and to bring the voltage between the inner and outer copper electrodes into the response voltage equation to obtain the line voltage.

9. An electronic device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the program, a non-contact voltage measurement method applicable to a radio station area as claimed in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, a non-contact voltage measurement method applicable to a radio station area as described in any one of claims 1 to 7 is implemented.

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