Voltage sensor, voltage measuring method and system

Abstract

The invention relates to a voltage sensor and a voltage measuring method and system. The voltage sensor comprises a control assembly; the field intensity measuring chip is used for measuring the electric field intensity of the measured wire; the driving assembly is used for driving the field intensity measuring chip to do periodic linear motion along a preset direction under the control of the control assembly; the control assembly is used for obtaining the height to the ground of the measured wire and determining the voltage of the measured wire according to the obtained height to the ground, the at least two sets of measurement data and the current calibration parameters. Wherein each group of measurement data comprises electric field intensity and position information corresponding to the electric field intensity, and the position information of at least two groups of measurement data is different; the current calibration parameters comprise the distance from the measured wire to a preset straight line and the projection point position of the measured wire on the preset straight line, and the preset straight line is a track straight line of the field intensity measurement chip performing periodic linear motion along the preset direction. The voltage sensor is small in size and high in measurement accuracy.

Description

Technical Field

[0001] The present application relates to the field of electronic measurement technology, and in particular to a voltage sensor, a voltage measurement method and a system. Background Art

[0002] With the development of power technology, micro smart sensors with high precision, wide frequency domain, wide range, self-powered, low cost, small size and ready-to-use are the key to realizing the digital transformation of power grids. Traditional voltage transformers are large and heavy, which makes it difficult to meet the digital grid's demand for miniaturization, lightweight and digitalization of sensor measurement equipment. Summary of the invention

[0003] Based on this, it is necessary to provide a voltage sensor, a voltage measurement method and a system that are small in size and accurate in measurement.

[0004] In a first aspect, the present application provides a voltage sensor, comprising:

[0005] Control components;

[0006] A field strength measurement chip, connected to the control component, for measuring the electric field strength of the measured conductor;

[0007] A driving component, connected to the field intensity measurement chip and the control component respectively, and used to drive the field intensity measurement chip to perform periodic linear motion along a preset direction under the control of the control component;

[0008] The control component is used to obtain the height of the measured conductor above the ground, and determine the voltage of the measured conductor according to the obtained height above the ground, at least two groups of measurement data and current calibration parameters; wherein each group of the measurement data includes the electric field strength and the position information corresponding to the electric field strength, and the position information of at least two groups of the measurement data is different; the current calibration parameters include the distance from the measured conductor to a preset straight line and the position of the projection point of the measured conductor on the preset straight line, and the preset straight line is a trajectory straight line of the field strength measurement chip performing periodic linear motion along the preset direction.

[0009] In one of the embodiments, the control component is further used to determine the current calibration parameter based on the acquired height above the ground and at least five sets of measurement data; wherein the position information of the at least five sets of measurement data is different.

[0010] In one of the embodiments, the control component is further configured to update the current calibration parameters according to at least five sets of new measurement data acquired.

[0011] In one embodiment, the voltage sensor includes a calibration mode and a measurement mode; wherein, in the calibration mode, the voltage sensor is used to determine and / or update the current calibration parameter through the control component;

[0012] The voltage sensor is also used to determine the voltage of the measured conductor through the control component in the measurement mode.

[0013] In one of the embodiments, the control component is further used to switch the voltage sensor from the calibration mode to the measurement mode after determining and / or updating the current calibration parameters, and to switch the voltage sensor from the measurement mode to the calibration mode after the voltage sensor maintains the measurement mode for a preset time to update the current calibration parameters.

[0014] In one embodiment, the voltage sensor further includes:

[0015] The distance measuring component is arranged on the same straight line with the driving component along the preset direction and connected with the control component, and is used to measure the position information of the field intensity measuring chip performing the periodic linear motion along the preset direction.

[0016] In one embodiment, the driving assembly includes a driving motor, a driving shaft and a driving block arranged on the driving shaft, the driving block is connected to the field strength measurement chip, and the driving motor is used to drive the driving block to drive the field strength measurement chip to move along the driving shaft.

[0017] In a second aspect, the present application further provides a voltage measurement method, which is applied to the voltage sensor provided in any of the above embodiments, and the method includes:

[0018] Obtain the height of the measured conductor above the ground;

[0019] The control driving component drives the field strength measurement chip to perform periodic linear motion along a preset direction;

[0020] Acquire multiple groups of measurement data and current calibration parameters, each group of measurement data includes the electric field strength measured by the field strength measurement chip and the corresponding position information, and the position information of at least two groups of measurement data is different; the current calibration parameters include the distance from the measured wire to a preset straight line and the position of the projection point of the measured wire on the preset straight line;

[0021] The voltage of the measured conductor is determined according to the acquired height above the ground, at least two groups of measurement data and current calibration parameters.

[0022] In one embodiment, the voltage sensor includes a calibration mode and a measurement mode, and determining the voltage of the measured conductor according to the acquired height above the ground, at least two sets of measurement data and current calibration parameters includes:

[0023] When the voltage sensor is in the calibration mode, determining and / or updating the current calibration parameters according to the acquired height above the ground and at least five sets of measurement data;

[0024] When the voltage sensor is in the measurement mode, the voltage of the measured conductor is determined according to the height above the ground, at least two sets of the measurement data and the current calibration parameters.

[0025] In a third aspect, the present application provides a voltage measurement system, including a conductor to be measured and a voltage sensor provided by any of the above embodiments, wherein the voltage sensor is used to measure the voltage of the conductor to be measured.

[0026] In the above-mentioned voltage sensor, voltage measurement method and system, the voltage sensor includes a control component, a field strength measurement chip and a driving component. The field strength measurement chip is used to measure the electric field strength of the measured conductor, and the control component can be used to control the driving component to drive the field strength measurement chip to perform periodic linear motion along a preset direction, obtain the height of the measured conductor to the ground, and determine the voltage of the measured conductor according to the obtained height to the ground, at least two sets of measurement data and current calibration parameters. The voltage sensor of the present application only needs one field strength measurement chip to measure the voltage of the measured conductor, and the volume is small. In addition, compared with the traditional array chip voltage measurement method that requires multiple chip arrays to be set, the present application drives the field strength measurement chip to perform periodic linear motion along a preset direction through a driving component, and obtains the electric field strength values ​​at different positions through a field strength measurement chip, which can ensure the consistency of the measurement data, avoid the measurement error caused by the inconsistency of multiple chips (the chip is not actually a linear output, and the built-in parameters of different chips will have errors, etc., which will cause the chip to be inconsistent), and improve the accuracy of the voltage measurement result obtained according to the measurement data. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 is a structural block diagram of a voltage sensor according to an embodiment;

[0029] Figure 2A schematic diagram of the principle of calculating the voltage of a long straight wire in one embodiment;

[0030] FIG3 is a structural block diagram of a driving component according to an embodiment;

[0031] Figure 4 FIG. 4 is a flow chart of a voltage measurement method according to an embodiment. DETAILED DESCRIPTION

[0032] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0034] It will be understood that “at least one” means one or more, and “plurality” means two or more.

[0035] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0036] In one embodiment, Figure 1 As shown, the present application provides a voltage sensor, including a control component 100, a field strength measurement chip 200 and a drive component 300. The control component 100 is connected to the field strength measurement chip 200 and the drive component 300 respectively, and the drive component 300 is connected to the field strength measurement chip 200.

[0037] The field strength measurement chip 200 can be used to measure the electric field strength of the measured wire. The driving component 300 can drive the field strength measurement chip 200 to perform periodic linear motion along a preset direction under the control of the control component 100. The preset direction can be a direction perpendicular to the extension direction of the measured wire, or a direction inclined at a certain angle to the extension direction of the measured wire, or a direction parallel to the extension direction of the measured wire, etc., and the embodiments of the present application are not limited here.

[0038] The control component 100 can be used to obtain the height of the measured conductor above the ground, and determine the voltage of the measured conductor based on the obtained height above the ground, at least two sets of measurement data and current calibration parameters. Each set of measurement data includes the electric field strength and the position information corresponding to the electric field strength, and the position information of at least two sets of measurement data is different. The current calibration parameters include the distance from the measured conductor to the preset straight line and the position of the projection point of the measured conductor on the preset straight line. The preset straight line is the trajectory straight line of the field strength measurement chip 200 performing periodic linear motion along a preset direction. Each position information can be obtained by a distance measurement component, or a plurality of preset positions can be set in advance, and the driving component 300 drives the field strength measurement chip 200 to perform periodic motion at a plurality of preset positions. The height of the measured conductor above the ground can be obtained by manual measurement, or by installing a distance sensor or the like.

[0039] For a cylindrical long straight wire, assuming that the charge per unit length is λ, according to Gauss's theorem, the electric field strength at a distance r from the center of the wire is:

[0040]

[0041] Assuming that the radius of the wire cross section is R and the distance from the zero potential energy point is x0, the potential on the wire surface can be obtained by integrating from the zero potential energy point:

[0042]

[0043] Combining formula (1) and (2), we get:

[0044]

[0045] like Figure 2 As shown, the direction indicated by a straight line in the plane where the cross section of the measured wire is located is selected as the preset direction. The driving component 300 can drive the field strength measurement chip 200 to perform periodic linear motion on the straight line. The distance from the measured wire to the straight line is d, and the projection point position of the measured wire on the straight line is x I , the ground is taken as the zero potential energy point, the height of the measured wire above the ground is x0, and the potential of the measured wire is V x The electric field strength component of the external interference electric field on the sensitive axis of the field strength measurement chip 200 is E0. According to formula (3), the electric field strength component of the measured wire at x can be obtained. i The electric field strength E caused by i The size is:

[0046]

[0047] Electric field strength E i The angle between the field intensity component and the preset straight line is θ, and the field intensity component on the sensitive axis of the field intensity measurement chip 200 is for:

[0048]

[0049] Combining formula (4) and (5), we get:

[0050]

[0051] The electric field strength measured by the field strength measurement chip 200 In fact, it is the sum of the electric field strength of the external interference electric field at the position of the field strength measurement chip 200 and the electric field strength of the measured wire at the position of the field strength measurement chip 200, that is:

[0052]

[0053] At the current calibration parameters d, x I , and the height above the ground x0 are known, only at least two sets of test data are needed ( , ) can be used to solve formula (7) to obtain the potential V of the measured conductor x And the electric field strength E0 of the external interference electric field.

[0054] In an embodiment of the present application, the voltage sensor includes a control component 100, a field strength measurement chip 200 and a drive component 300. The field strength measurement chip 200 is used to measure the electric field strength of the measured conductor, and the control component 100 can be used to control the drive component 300 to drive the field strength measurement chip 200 to perform periodic linear motion along a preset direction, obtain the height of the measured conductor above the ground, and determine the voltage of the measured conductor based on the obtained height above the ground, at least two sets of measurement data and current calibration parameters. The voltage sensor of the present application only requires one field strength measurement chip 200 to measure the voltage of the measured conductor, and has a small size. In addition, compared with the traditional array chip voltage measurement method that requires multiple chip arrays to be set up, the present application drives the field strength measurement chip 200 to perform periodic linear motion along a preset direction through the driving component 300, and obtains the electric field strength values ​​at different positions through a field strength measurement chip 200, which can ensure the consistency of the measurement data and avoid measurement errors caused by inconsistencies in multiple chips (the chip is not actually a linear output, and the built-in parameters of different chips will have errors, etc., which will lead to chip inconsistencies), thereby improving the accuracy of the voltage measurement results obtained based on the measurement data.

[0055] In one embodiment, the control component 100 is further used to determine the current calibration parameters according to the acquired height above the ground and at least five sets of measurement data, wherein the position information of the at least five sets of measurement data is different.

[0056] Specifically, according to formula (7), we get the equation:

[0057]

[0058] Rearranging formula (8), we get:

[0059]

[0060] Substituting the five sets of measured data into formula (9) and performing pairwise subtraction, we can obtain:

[0061]

[0062] in,

[0063]

[0064]

[0065]

[0066]

[0067] Rearranging formula (11) yields:

[0068]

[0069] Formula (15) corresponds to four formulas. The difference between two adjacent formulas is:

[0070]

[0071] in,

[0072]

[0073]

[0074]

[0075]

[0076] Solving formula (16) can obtain the distance d from the measured wire to the preset straight line and the projection point position x of the measured wire on the preset straight line. I The value of .

[0077] In this embodiment, since the five sets of measurement data are measured at different positions by the same measurement chip, the data are consistent. Compared with the traditional array chip voltage measurement method, the accuracy of the current calibration parameters obtained according to the five sets of measurement data is improved.

[0078] In one embodiment, the control component 100 is further used to update the current calibration parameters according to the acquired new at least five sets of measurement data. In order to ensure the real-time and accuracy of the current calibration parameters, it is necessary to regularly acquire new at least five sets of measurement data and update the current calibration parameters according to formulas (9)-(20).

[0079] In one embodiment, the voltage sensor includes a calibration mode and a measurement mode. In the calibration mode, the voltage sensor is used to determine and / or update the current calibration parameters through the control component 100. In the measurement mode, the voltage sensor is also used to determine the voltage of the measured wire through the control component 100.

[0080] Furthermore, the control component 100 is also used to switch the voltage sensor from the calibration mode to the measurement mode after determining and / or updating the current calibration parameters, and to switch the voltage sensor from the measurement mode to the calibration mode after the voltage sensor maintains the measurement mode for a preset time to update the current calibration parameters.

[0081] It can be understood that after the voltage sensor is installed, the voltage sensor is in the calibration mode, and the control component 100 can first obtain at least five sets of measurement data and determine the value of the current calibration parameter based on formulas (9)-(20). After that, the voltage sensor enters the measurement mode. In the measurement mode, the current calibration parameter is known. According to formula (8), let , ,get:

[0082]

[0083] The control component 100 can reacquire two sets of measurement data, and substitute the two sets of measurement data, the height of the measured conductor above the ground, and the current calibration parameters into formula (21) to obtain the voltage of the measured conductor. After the voltage sensor runs in the measurement mode for a preset time, it can switch to the calibration mode and reacquire at least five sets of measurement data to update the current calibration parameters according to the reacquired five sets of measurement data.

[0084] Optionally, in some embodiments, after the electric field sensor is switched from the measurement mode to the calibration mode, the height of the measured conductor above the ground can be re-acquired.

[0085] In one embodiment, the voltage sensor further includes a distance measuring component. The distance measuring component and the driving component 300 are arranged on the same straight line along the preset direction and are connected to the control component 100. The distance measuring component can be used to measure the position information of the field intensity measurement chip 200 performing periodic linear motion along the preset direction. The distance measuring component can include a laser rangefinder, and its measurement accuracy can reach micrometer level.

[0086] In one embodiment, as shown in FIG3 , the drive assembly 300 includes a drive motor 310, a drive shaft 320, and a drive block 330 disposed on the drive shaft 320. The drive block 330 is connected to the field strength measurement chip 200, and the drive motor 310 is used to drive the drive block 330 to drive the field strength measurement chip 200 to move along the drive shaft 320. Exemplarily, the drive motor 310 can be a stepper motor. The lead screw and the motor rotor of the stepper motor are integrated as an output shaft of the motor, and the drive block 320 is disposed on the lead screw. When the motor is working, the output shaft rotates, so that the drive block 320 can move back and forth on the output shaft, thereby making the field strength measurement chip 200 move linearly along the output shaft.

[0087] In one embodiment, Figure 4 As shown, the present application also provides a voltage measurement method, which can be applied to the voltage sensor provided in any of the above embodiments. The voltage measurement method includes steps S410-S440.

[0088] S410, obtaining the height of the measured wire above the ground.

[0089] The control component can obtain the height of the measured wire above the ground by obtaining manual measurement values, and can also obtain the height of the measured wire above the ground through measurement values ​​such as distance sensors.

[0090] S420, controlling the driving component to drive the field intensity measurement chip to perform periodic linear motion along a preset direction.

[0091] S430, obtaining multiple groups of measurement data and current calibration parameters.

[0092] Each set of measurement data includes the electric field strength measured by the field strength measurement chip and the corresponding position information, and the position information of at least two sets of measurement data is different; the current calibration parameters include the distance from the measured wire to the preset straight line and the projection point position of the measured wire on the preset straight line.

[0093] The control component can control the driving component to drive the field strength measurement chip to perform periodic linear motion along a preset direction, so as to obtain the electric field strength of the measured wire at different positions through the field strength measurement chip. Each position information can be obtained through the distance measurement component; multiple preset positions can also be set in advance, and the position information of each preset position is stored in the control component.

[0094] S440, determining the voltage of the measured conductor according to the acquired height above the ground, at least two groups of measurement data and current calibration parameters.

[0095] Based on formula (7), the control component can determine the voltage of the measured conductor according to the acquired height above the ground, at least two sets of measurement data and current calibration parameters.

[0096] In an embodiment of the present application, a driving component is controlled to drive a field strength measurement chip to perform periodic linear motion along a preset direction, and the height above the ground of the measured conductor, multiple sets of measurement data and current calibration parameters are obtained. The voltage of the measured conductor is determined based on the obtained height above the ground, at least two sets of measurement data and current calibration parameters. Compared with the traditional array chip voltage measurement method which requires multiple chip arrays to be set up, the present application drives the field strength measurement chip to perform periodic linear motion along a preset direction through a driving component, and obtains the electric field strength values ​​at different positions through a field strength measurement chip, which can ensure the consistency of the measurement data, avoid measurement errors caused by inconsistencies in multiple chips (the chip is not actually a linear output, and the built-in parameters of different chips will have errors), and improve the accuracy of the voltage measurement results obtained based on the measurement data.

[0097] In one embodiment, the voltage sensor includes a calibration mode and a measurement mode, and determines the voltage of the measured conductor based on the acquired height above the ground, at least two sets of measurement data and current calibration parameters, including: when the voltage sensor is in the calibration mode, determining and / or updating the current calibration parameters based on the acquired height above the ground and at least five sets of measurement data; and when the voltage sensor is in the measurement mode, determining the voltage of the measured conductor based on the height above the ground, at least two sets of measurement data and current calibration parameters.

[0098] It can be understood that when the voltage sensor is in calibration mode, the control component can determine and / or update the current calibration parameters based on formulas (9)-(20); when the voltage sensor is in measurement mode, the control component can determine the voltage of the measured conductor according to formula (21).

[0099] In this embodiment, the current calibration parameters are determined or updated by the control component when the voltage sensor is in the calibration mode. In this way, when the voltage sensor is in the measurement mode, only two sets of measurement data are needed each time to determine the voltage of the measured conductor. Compared with the method of calculating and determining the voltage based on five sets of measurement data each time, the calculation complexity can be significantly reduced, and the demand for the control component computing kernel is reduced. There is no need to send it to the host computer for calculation, and the edge computing resources can be fully utilized.

[0100] In one embodiment, the present application further provides a voltage measurement system, including a conductor to be measured and a voltage sensor provided by any of the above embodiments, wherein the voltage sensor can be used to measure the voltage of the conductor to be measured.

[0101] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0102] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0103] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A voltage sensor, It is characterized in that include: Control components; A field strength measurement chip, connected to the control component, for measuring the electric field strength of the measured conductor; A driving component, connected to the field intensity measurement chip and the control component respectively, and used to drive the field intensity measurement chip to perform periodic linear motion along a preset direction under the control of the control component; The control component is used to obtain the height of the measured conductor above the ground, and determine the voltage of the measured conductor according to the obtained height above the ground, at least two groups of measurement data and current calibration parameters; wherein each group of the measurement data includes the electric field strength and the position information corresponding to the electric field strength, and the position information of at least two groups of the measurement data is different; the current calibration parameters include the distance from the measured conductor to a preset straight line and the position of the projection point of the measured conductor on the preset straight line, and the preset straight line is a trajectory straight line of the field strength measurement chip performing periodic linear motion along the preset direction.

2. The voltage sensor according to claim 1, It is characterized in that The control component is also used to determine the current calibration parameter based on the acquired height above the ground and at least five sets of measurement data; wherein the position information of the at least five sets of measurement data is different.

3. The voltage sensor according to claim 2, It is characterized in that The control component is also used to update the current calibration parameters according to the acquired new at least five sets of measurement data.

4. The voltage sensor according to claim 1, It is characterized in that The voltage sensor includes a calibration mode and a measurement mode; wherein, in the calibration mode, the voltage sensor is used to determine and / or update the current calibration parameter through the control component; The voltage sensor is also used to determine the voltage of the measured conductor through the control component in the measurement mode.

5. The voltage sensor according to claim 4, It is characterized in that The control component is also used to switch the voltage sensor from the calibration mode to the measurement mode after determining and / or updating the current calibration parameters, and to switch the voltage sensor from the measurement mode to the calibration mode after the voltage sensor maintains the measurement mode for a preset time to update the current calibration parameters.

6. The voltage sensor according to claim 1, It is characterized in that The voltage sensor further comprises: The distance measuring component is arranged on the same straight line with the driving component along the preset direction and connected with the control component, and is used to measure the position information of the field intensity measuring chip performing the periodic linear motion along the preset direction.

7. The voltage sensor according to claim 1, It is characterized in that The driving assembly includes a driving motor, a driving shaft and a driving block arranged on the driving shaft, the driving block is connected to the field strength measurement chip, and the driving motor is used to drive the driving block to drive the field strength measurement chip to move along the driving shaft.

8. A voltage measurement method, It is characterized in that Applied to the voltage sensor according to any one of claims 1 to 7, the method comprises: Obtain the height of the measured conductor above the ground; The control driving component drives the field strength measurement chip to perform periodic linear motion along a preset direction; Acquire multiple groups of measurement data and current calibration parameters, each group of measurement data includes the electric field strength measured by the field strength measurement chip and the corresponding position information, and the position information of at least two groups of measurement data is different; the current calibration parameters include the distance from the measured wire to a preset straight line and the position of the projection point of the measured wire on the preset straight line; The voltage of the measured conductor is determined according to the acquired height above the ground, at least two groups of measurement data and current calibration parameters.

9. The method according to claim 8, It is characterized in that The voltage sensor includes a calibration mode and a measurement mode, and determining the voltage of the measured conductor according to the acquired height above the ground, at least two sets of measurement data and current calibration parameters includes: When the voltage sensor is in the calibration mode, determining and / or updating the current calibration parameters according to the acquired height above the ground and at least five sets of measurement data; When the voltage sensor is in the measurement mode, the voltage of the measured conductor is determined according to the height above the ground, at least two sets of the measurement data and the current calibration parameters.

10. A voltage measurement system, It is characterized in that It comprises a conductor to be measured and a voltage sensor as described in any one of claims 1 to 7, wherein the voltage sensor is used to measure the voltage of the conductor to be measured.

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