Voltage sensor, voltage measurement method and system

Abstract

The application relates to a voltage sensor, a voltage measurement method and a system. The voltage sensor comprises a control component, a field strength measurement chip for measuring the electric field strength of a measured wire, and a driving component for driving the field strength measurement chip to move periodically along a preset direction under the control of the control component. The control component is used for acquiring the height of the measured wire above the ground and determining the voltage of the measured wire according to the acquired height, at least two groups of measurement data and current calibration parameters. Each group of measurement data comprises electric field strength and position information corresponding to the electric field strength, and the position information of the 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 the trajectory straight line of the periodic linear motion of the field strength measurement chip along the preset direction. The voltage sensor has the advantages of small size and high measurement accuracy.

Description

TECHNICAL FIELD

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

[0002] With the development of power technology, a miniature intelligent sensor with the characteristics of high precision, wide frequency domain, wide range, self-powered, low cost, small size and instant use is the key to realize the digital transformation of power grids. Traditional voltage transformers are large in size and heavy in weight, which are difficult to meet the needs of digital power grids for small, lightweight and digital sensing and measuring equipment. SUMMARY

[0003] Therefore, it is necessary to provide a voltage sensor with small size and accurate measurement, a voltage measurement method and system.

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

[0005] a control component;

[0006] a field strength measurement chip connected with the control component, configured to measure the electric field strength of a measured conductor;

[0007] a driving component connected with the field strength measurement chip and the control component, configured to drive the field strength measurement chip to move periodically along a preset direction under the control of the control component;

[0008] the control component is configured 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 a current calibration parameter; each group 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 groups of measurement data is different; the current calibration parameter includes the distance from the measured conductor to a preset straight line and the projection point position of the measured conductor on the preset straight line, and the preset straight line is the trajectory straight line of the periodic linear motion of the field strength measurement chip along the preset direction.

[0009] In one embodiment, the control component is further configured to determine the current calibration parameter according to the obtained height above the ground and at least five groups of measurement data; the position information of the at least five groups of measurement data is different.

[0010] In one embodiment, the control component is further configured to update the current calibration parameter according to newly obtained at least five groups of measurement data.

[0011] In one of the embodiments, the voltage sensor comprises a calibration mode and a measurement mode; wherein the voltage sensor is configured to determine and / or update the current calibration parameter by the control component in the calibration mode;

[0012] The voltage sensor is further configured to determine the voltage of the measured conductor by the control component in the measurement mode.

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

[0014] In one of the embodiments, the voltage sensor further comprises:

[0015] A ranging component disposed on the same straight line as the driving component along the preset direction and connected with the control component, configured to measure the position information of the field strength measurement chip in the periodic linear motion along the preset direction.

[0016] In one of the embodiments, the driving component comprises a driving motor, a driving shaft and a driving block disposed on the driving shaft, the driving block is connected with the field strength measurement chip, and the driving motor is configured to drive the driving block to drive the field strength measurement chip to move along the driving shaft.

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

[0018] Obtaining the height of the measured conductor to the ground;

[0019] Controlling the driving component to drive the field strength measurement chip to make periodic linear motion along a preset direction;

[0020] Obtaining a plurality of sets of measurement data and a current calibration parameter, each set of the measurement data comprising 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 the measurement data is different; the current calibration parameter comprises the distance from the measured conductor to the preset straight line and the projection point position of the measured conductor on the preset straight line;

[0021] Determining the voltage of the measured conductor according to the obtained height of the measured conductor to the ground, at least two sets of measurement data and the current calibration parameter.

[0022] In one of the embodiments, the voltage sensor comprises a calibration mode and a measurement mode, and the determining the voltage of the measured conductor according to the obtained height above ground, at least two groups of measurement data and the current calibration parameter comprises:

[0023] In the case that the voltage sensor is in the calibration mode, the current calibration parameter is determined and / or updated according to the obtained height above ground and at least five groups of measurement data;

[0024] In the case that the voltage sensor is in the measurement mode, the voltage of the measured conductor is determined according to the height above ground, at least two groups of the measurement data and the current calibration parameter.

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

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

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 It is a structure block diagram of the voltage sensor of an embodiment;

[0029] Figure 2Fig. 1 is a schematic diagram of a principle for calculating a voltage of a long straight wire according to an embodiment;

[0030] Figure 3 Fig. 2 is a structural block diagram of a driving assembly according to an embodiment;

[0031] Figure 4 Fig. 3 is a flowchart of a voltage measurement method according to an embodiment. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the relevant drawings. The drawings show embodiments of the present application. 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 commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0034] It should be understood that "at least one" means one or more, and "multiple" means two or more.

[0035] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It should be understood that the term "comprises / comprising", or "has / having", or "includes / including" or other similar terms, specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0036] In one embodiment, as shown in Figure 1 The present application provides a voltage sensor, which includes a control assembly 100, a field strength measurement chip 200 and a driving assembly 300. The control assembly 100 is connected with the field strength measurement chip 200 and the driving assembly 300 respectively, and the driving assembly 300 is connected with 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 assembly 300 can drive the field strength measurement chip 200 to move periodically and linearly along a preset direction under the control of the control assembly 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, and the embodiments of the present application do not make any limitation here.

[0038] The control assembly 100 can be used to obtain the height of the measured wire above the ground, and determine the voltage of the measured wire according to the obtained height above the ground, at least two groups of measurement data and the current calibration parameter. Each group of measurement data includes the electric field strength and the position information corresponding to the electric field strength, and the position information of the at least two groups of measurement data is different. The current calibration parameter includes 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. The preset straight line is the trajectory straight line of the periodic linear motion of the field strength measurement chip 200 along the preset direction. Each position information can be obtained by the distance measuring assembly, or a plurality of preset positions can be set in advance, and the field strength measurement chip 200 is driven by the driving assembly 300 to move periodically at the plurality of preset positions. The height of the measured wire above the ground can be obtained by manual measurement, or by installing a distance sensor and the like.

[0039] For a cylindrical long straight wire, assuming that the unit length charge is λ, according to Gauss 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 point is x0, the electric potential on the surface of the wire can be obtained by integrating from the zero potential point:

[0042]

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

[0044]

[0045] As shown in Figure 2 , the direction indicated by a straight line in the plane of the cross section of the measured wire is selected as the preset direction. The driving assembly 300 can drive the field strength measurement chip 200 to move periodically and linearly 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 height of the measured wire above the ground is x0, the electric potential of the measured wire is V x , and 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 E caused by the measured wire at x i can be obtained.i The size is:

[0046]

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

[0048]

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

[0050]

[0051] Electric field strength measured by the field strength measuring chip 200 In reality, it is the sum of the electric field strength of the external interference electric field at the location of the field strength measuring chip 200 and the electric field strength of the wire being measured at the location of the field strength measuring chip 200, that is:

[0052]

[0053] Under the current calibration parameters d, x I Given that the altitude x0 above the ground is known, only at least two sets of test data are needed. , The potential V of the conductor under test can be obtained by solving formula (7). x The electric field strength E0 of the external interference electric field.

[0054] In this embodiment, 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 conductor under test. The control component 100 can 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 conductor under test relative to the ground, and determine the voltage of the conductor under test based on the obtained height, at least two sets of measurement data, and current calibration parameters. The voltage sensor of this application only requires one field strength measurement chip 200 to measure the voltage of the conductor under test, and has a small size. In addition, compared with the traditional method of measuring voltage using array chips which requires setting up multiple chip arrays, this application uses the driving component 300 to drive the field strength measuring chip 200 to make periodic linear motion along a preset direction. By using a single field strength measuring chip 200 to obtain the electric field strength values ​​at different locations, the consistency of the measurement data can be guaranteed. This avoids measurement errors caused by inconsistencies among multiple chips (chips are not actually linear outputs, and errors in the built-in parameters of different chips can also lead to chip inconsistencies), thereby improving the accuracy of the voltage measurement results obtained from the measurement data.

[0055] In one embodiment, the control component 100 is further configured to determine the current calibration parameter according to the acquired height above sea level and at least five groups of measurement data. Wherein, the position information of the at least five groups of measurement data is different.

[0056] Specifically, according to formula (7), the equation is obtained as:

[0057]

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

[0059]

[0060] Substituting the five groups of measurement data into formula (9) and making a difference between each two can obtain:

[0061]

[0062] Wherein,

[0063]

[0064]

[0065]

[0066]

[0067] Rearranging formula (11) can obtain:

[0068]

[0069] Formula (15) corresponds to four formulas, and making a difference between each two adjacent formulas can obtain:

[0070]

[0071] Wherein,

[0072]

[0073]

[0074]

[0075]

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

[0077] In the embodiment, since the five groups of measurement data are measured by the same measurement chip at different positions, the data are consistent, and compared with the traditional array chip voltage measurement mode, the accuracy of the current calibration parameter obtained according to the five groups of measurement data is improved.

[0078] In one embodiment, the control component 100 is also configured to update the current calibration parameter according to the obtained new at least five groups of measurement data. In order to ensure the real-time and accuracy of the current calibration parameter, it is necessary to periodically obtain new at least five groups of measurement data to update the current calibration parameter according to the formulas (9)-(20).

[0079] In one embodiment, the voltage sensor comprises a calibration mode and a measurement mode. In the calibration mode, the voltage sensor is configured to determine and / or update the current calibration parameter by the control component 100. In the measurement mode, the voltage sensor is configured to determine the voltage of the measured conductor by the control component 100.

[0080] Further, the control component 100 is also configured to switch the voltage sensor from the calibration mode to the measurement mode after determining and / or updating the current calibration parameter, and 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 parameter.

[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 groups of measurement data, and determine the value of the current calibration parameter based on the formulas (9)-(20). Then, the voltage sensor enters the measurement mode, and in the measurement mode, the current calibration parameter is known, and according to the formula (8), let , , obtain:

[0082]

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

[0084] Optionally, in some embodiments, after the voltage sensor is switched from the measurement mode to the calibration mode, the height of the measured conductor to the ground can also be reacquired.

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

[0086] In one embodiment, such as Figure 3 As shown, the drive assembly 300 includes a drive motor 310, a drive shaft 320, and a drive block 330 mounted on the drive shaft 320. The drive block 330 is connected to the field strength measurement chip 200, and the drive motor 310 drives the drive block 330 to move the field strength measurement chip 200 along the drive shaft 320. For example, the drive motor 310 can be a stepper motor. The lead screw and rotor of the stepper motor are integrated as the output shaft, and the drive block 320 is mounted on the lead screw. When the motor operates, the output shaft rotates, allowing the drive block 320 to move back and forth on the output shaft, thereby causing the field strength measurement chip 200 to move linearly along the output shaft.

[0087] In one embodiment, such as Figure 4 As shown, this 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, obtain the height of the conductor being measured above the ground.

[0089] The control component can obtain the height of the conductor above the ground by acquiring manual measurements or by acquiring measurements from distance sensors and other means.

[0090] S420 controls the drive component to drive the field strength measurement chip to perform periodic linear motion along a preset direction.

[0091] S430 acquires multiple sets 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 location information. The location information of at least two sets of measurement data are different. The current calibration parameters include the distance from the measured wire to the preset straight line and the position of the projection point of the measured wire on the preset straight line.

[0093] The control component can control the drive component to drive the field strength measuring chip to perform periodic linear motion along a preset direction, so as to obtain the electric field strength of the conductor under test at different positions through the field strength measuring chip. The position information can be obtained through the ranging component; alternatively, multiple preset positions can be set in advance, and the position information of each preset position can be stored in the control component.

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

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

[0096] In the embodiment of the present application, by controlling the driving component to drive the field strength measurement chip to make periodic linear motion along the preset direction, the height above ground of the measured conductor, multiple groups of measurement data and the current calibration parameter are obtained, and the voltage of the measured conductor is determined according to the obtained height above ground, the at least two groups of measurement data and the current calibration parameter. Compared with the traditional array chip voltage measurement method which needs to set multiple chip arrays, the present application drives the field strength measurement chip to make periodic linear motion along the preset direction by the driving component, and obtains the electric field strength values at different positions by one field strength measurement chip, which can ensure the consistency of the measurement data, avoid measurement errors caused by the inconsistency of multiple chips (the chips are not actually linear output, and the built-in parameters of different chips will have errors), and improve the accuracy of the voltage measurement result obtained according to the measurement data.

[0097] In one embodiment, the voltage sensor includes a calibration mode and a measurement mode, and the determination of the voltage of the measured conductor according to the obtained height above ground, the at least two groups of measurement data and the current calibration parameter includes: in the case that the voltage sensor is in the calibration mode, determining and / or updating the current calibration parameter according to the obtained height above ground and the at least five groups of measurement data; and in the case that the voltage sensor is in the measurement mode, determining the voltage of the measured conductor according to the height above ground, the at least two groups of measurement data and the current calibration parameter.

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

[0099] In the embodiment, the control component determines or updates the current calibration parameter when the voltage sensor is in the calibration mode, so that only two groups of measurement data are needed to determine the voltage of the measured conductor each time when the voltage sensor is in the measurement mode. Compared with the method of calculating and determining the voltage according to five groups of measurement data each time, the calculation complexity can be obviously reduced, the demand for the calculation kernel of the control component can be reduced, and the edge calculation resources can be fully utilized without the need for sending to the upper computer for calculation.

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

[0101] In the description of the specification, the description of the terms "some embodiments", "other embodiments", etc. means that the particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The illustrative examples of the application described above are not meant to be comprehensive and exhaustive, but rather to provide a sufficient description of the application to enable a person of ordinary skill in the art to make and use the application. Thus, the examples of the application are not intended to be exhaustive or complete.

[0102] The technical features of the above embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not contradict each other, they should be considered as the scope of the present application.

[0103] The above embodiments only express several implementation manners of the application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the application. It should be pointed out that, for those skilled in the art, some modifications and improvements can be made without departing from the concept of the application, and these all belong to the protection scope of the application. Therefore, the protection scope of the application should be subject to the appended claims.

Claims

1. A voltage sensor, characterized by The voltage sensor comprises: a control component; a field strength measurement chip connected with the control component, used for measuring the electric field strength of a measured conductor; a driving component connected with the field strength measurement chip and the control component, used for driving the field strength measurement chip to move periodically and linearly along a preset direction under the control of the control component; the control component is used for acquiring the height of the measured conductor above the ground, and determining the voltage of the measured conductor according to the acquired height above the ground, at least two groups of measurement data and a current calibration parameter; each group of measurement data comprises the electric field strength and position information corresponding to the electric field strength, and the position information of at least two groups of measurement data is different; the current calibration parameter comprises the distance from the measured conductor to a preset straight line and the projection point position of the measured conductor on the preset straight line, and the preset straight line is the trajectory straight line of the periodic linear motion of the field strength measurement chip along the preset direction.

2. The voltage sensor of claim 1, wherein, The control component is further used for determining the current calibration parameter according to the acquired height above the ground and at least five groups of measurement data; the position information of the at least five groups of measurement data is different.

3. The voltage sensor of claim 2, wherein, The control component is further used for updating the current calibration parameter according to newly acquired at least five groups of measurement data.

4. The voltage sensor of claim 1, wherein, The voltage sensor comprises a calibration mode and a measurement mode; in the calibration mode, the control component is used for determining and / or updating the current calibration parameter; in the measurement mode, the control component is used for determining the voltage of the measured conductor.

5. The voltage sensor of claim 4, wherein, The control component is further used for switching the voltage sensor from the calibration mode to the measurement mode after determining and / or updating the current calibration parameter, and switching the voltage sensor from the measurement mode to the calibration mode after the voltage sensor maintains the measurement mode for a preset time, so as to update the current calibration parameter.

6. The voltage sensor of claim 1, wherein, The voltage sensor further comprises: a distance measurement component arranged on the same straight line as the driving component along the preset direction and connected with the control component, used for measuring the position information of the periodic linear motion of the field strength measurement chip along the preset direction.

7. The voltage sensor of claim 1, wherein, The driving component comprises a driving motor, a driving shaft and a driving block arranged on the driving shaft; the driving block is connected with the field strength measurement chip; the driving motor is used for driving the driving block to drive the field strength measurement chip to move along the driving shaft.

8. A voltage measurement method, characterized by, The method is applied to the voltage sensor of any one of claims 1-7, and the method comprises: acquiring the height of the measured conductor above the ground; controlling the driving component to drive the field strength measurement chip to move periodically and linearly along a preset direction; acquiring a plurality of groups of measurement data and a current calibration parameter; each group of measurement data comprises the electric field strength measured by the field strength measurement chip and corresponding position information; the position information of at least two groups of measurement data is different; the current calibration parameter comprises the distance from the measured conductor to a preset straight line and the projection point position of the measured conductor on the preset straight line; and the preset straight line is the trajectory straight line of the periodic linear motion of the field strength measurement chip along the preset direction. determining the voltage of the measured conductor according to the acquired ground height, at least two sets of measurement data and current calibration parameters.

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

10. A voltage measurement system, characterized by A voltage sensor as claimed in any one of claims 1-7 for measuring the voltage of a measured conductor.

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