Calibration device for portable DC synthetic electric field measuring instrument

Abstract

The invention discloses a portable direct current synthetic electric field measuring instrument calibration device. The device comprises: an insulating column, a high voltage plate and a control box arranged in sequence from bottom to top in the vertical direction; a grounding lead support arranged at intervals from the high voltage plate in the horizontal direction; a grounding lead led out of the control box; when calibrating a direct current synthetic electric field measuring instrument provided with a cover plate, the calibration device is vertically placed above the probe of the direct current synthetic electric field measuring instrument to be calibrated; the moving plate hole of the probe of the direct current synthetic electric field measuring instrument to be calibrated is aligned with the through hole on the cover plate; the insulating column is connected to the cover plate; the grounding lead is connected to the shell of the direct current synthetic electric field measuring instrument to be calibrated, wherein the shell and the cover plate are connected at ground potential; the direct current synthetic electric field measuring instrument to be calibrated is calibrated according to the nominal electrostatic field formed in the space opposite to the high voltage plate and the cover plate. The calibration device can be conveniently and efficiently used for on-site calibration of synthetic electric field measuring instruments.

Description

Technical Field

[0001] The invention belongs to the field of power transmission and transformation engineering / electromagnetic compatibility technology, and in particular relates to a portable direct current synthetic electric field measuring instrument calibration device. Background Art

[0002] In recent years, the construction of DC transmission lines in my country has developed rapidly. As the main electromagnetic environment parameter of DC transmission lines and substations, the monitoring of DC synthetic electric field has always been an important task in environmental impact assessment. At present, the measurement of DC synthetic electric field mainly relies on synthetic electric field measuring instruments.

[0003] DC lines are usually used to achieve long-distance point-to-point transmission. Therefore, the monitoring of the synthetic electric field is usually carried out along the line, and the monitoring cycle is long. Since the monitoring instrument is in the transportation process most of the time, the accuracy of the monitoring instrument is difficult to guarantee and needs to be calibrated before field testing. At present, the calibration device used for field calibration is large in size and inconvenient to transfer, so field calibration is difficult to implement. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an on-site calibration device for a DC synthetic electric field measuring instrument to solve the problems of low efficiency and inconvenience in implementation when calibrating a DC synthetic electric field measuring instrument on-site.

[0005] The portable DC synthetic electric field measuring instrument calibration device provided by the present invention comprises:

[0006] Insulating columns, high-voltage plates and control boxes are arranged in sequence from bottom to top in the vertical direction;

[0007] A grounding lead support arranged horizontally and spaced apart from the high voltage plate;

[0008] A ground lead extending from the control box;

[0009] When calibrating a DC synthetic electric field measuring instrument provided with a cover plate, the calibration device is vertically placed above the probe of the DC synthetic electric field measuring instrument to be calibrated, and the insulating column is connected to the cover plate;

[0010] The moving plate hole of the probe of the DC synthetic electric field measuring instrument to be calibrated is aligned with the through hole on the cover plate;

[0011] The grounding lead is away from the control box and extends along a first horizontal direction across a first distance, then extends along the top of the grounding lead support to the bottom of the grounding lead support, and after crossing a second distance along a second horizontal direction, is connected to the housing of the DC synthetic electric field measuring instrument to be calibrated, wherein the housing is connected to the cover plate at ground potential;

[0012] The DC synthetic electric field measuring instrument to be calibrated is calibrated according to the nominal electrostatic field formed in the space opposite to the high voltage plate and the cover plate.

[0013] Specifically, it also includes:

[0014] A grounding plate connected to the insulating column, which is provided with a calibration hole;

[0015] When calibrating a DC synthetic electric field measuring instrument without a cover plate, the calibration device is vertically placed above the probe of the DC synthetic electric field measuring instrument to be calibrated, and the moving plate hole of the probe of the DC synthetic electric field measuring instrument to be calibrated is aligned with the calibration hole of the grounding plate;

[0016] The grounding lead is away from the control box and extends along a first horizontal direction across a first distance, then extends along the top of the grounding lead support to the bottom of the grounding lead support, and after crossing a second distance along a second horizontal direction, is connected to the housing of the DC synthetic electric field measuring instrument to be calibrated, wherein the housing is connected to the ground electrode at a ground potential;

[0017] The DC synthetic electric field measuring instrument to be calibrated is calibrated according to the nominal electrostatic field formed in the space opposite to the high voltage electrode plate and the ground electrode plate.

[0018] Specifically, the first distance is not greater than the second distance;

[0019] The first distance is not less than 50 cm.

[0020] Specifically, the control box is provided with a battery module, a DC high voltage module and a polarity switching switch which are connected in sequence;

[0021] The battery module supplies power to the DC high voltage module;

[0022] The ground terminal of the DC high voltage module is connected to the ground lead in the control box;

[0023] The DC high voltage module is also connected to a polarity switching switch, and the polarity switching switch is used to switchably connect the high voltage plate to the positive voltage end or the negative voltage end of the DC high voltage module.

[0024] Specifically, the DC high voltage module includes a positive voltage module and a negative voltage module;

[0025] The grounding terminal of the positive voltage module and the grounding terminal of the negative voltage module are respectively connected to the grounding lead at a ground potential;

[0026] The polarity switching switch connects the positive voltage end of the positive voltage module to the high voltage plate, or connects the negative voltage end of the negative voltage module to the high voltage plate.

[0027] Specifically, a voltage regulating module and a start switch are also provided in the control box;

[0028] The battery module is connected to the DC high voltage module via a start switch;

[0029] The DC high voltage module is also connected to a voltage regulating module, and the voltage regulating module regulates the magnitude of the output voltage of the high voltage end of the DC high voltage module.

[0030] Specifically, the voltage adjustment module is a manual knob;

[0031] The polarity switching switch is a manual button;

[0032] The starting switch is a manual button.

[0033] Specifically, the positive voltage terminal or the negative voltage terminal of the DC high voltage module is vertically led out from the control box through a high voltage lead, and is connected to the high voltage plate after passing through the bottom plate of the control box;

[0034] The grounding lead is led out from the top plate close to the control box to ensure that the grounding lead is higher than the high-voltage plate in the first horizontal direction.

[0035] Specifically, the distance between the grounding plate and the high voltage plate in the vertical direction is 2-8 cm;

[0036] The vertical distance between the grounding electrode and the cover of the DC synthetic electric field measuring instrument to be calibrated is 2-8 cm.

[0037] Specifically, the bottom plate of the control box is made of insulating material so that the control box is insulated from the high-voltage plate.

[0038] The portable DC synthetic electric field measuring instrument calibration device proposed in the present invention can flexibly generate the nominal electrostatic field required for the synthetic electric field measuring instrument calibration, and can be conveniently and efficiently used for on-site calibration of the synthetic electric field measuring instrument, thereby ensuring the accuracy of on-site DC synthetic electric field testing of DC transmission lines and substations. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0040] Figure 1 A schematic diagram of the structure of a control box of a portable DC synthetic electric field measuring instrument calibration device according to a preferred embodiment of the present invention;

[0041] Figure 2 It is a schematic diagram of the composition of a control box of a calibration device according to a preferred embodiment of the present invention;

[0042] Figure 3The present invention is a schematic diagram of the routing of high voltage leads and ground leads in a portable DC synthetic electric field measuring instrument calibration device according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0043] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0044] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0045] The calibration of DC synthetic electric field measuring instrument adopts nominal electrostatic field for calibration. However, the calibration device currently used for on-site calibration of DC synthetic electric field measuring instrument is large in size and inconvenient to transfer along the line, so on-site calibration is difficult to implement and the implementation rate is low. It is urgent and necessary to design and develop a portable calibration device for DC synthetic electric field measuring instrument.

[0046] Some models of DC synthetic electric field measuring instruments include a cover plate arranged on the top thereof; the cover plate is provided with a through hole adapted to the moving plate hole. When measuring the synthetic electric field, the cover plate needs to be grounded; specifically, the metal cover plate is connected to the earth via a low-resistance wire (large wire diameter), or the metal shell of the DC synthetic electric field measuring instrument is connected to the earth via a low-resistance wire (large wire diameter), so as to achieve the grounding of the metal cover plate, that is, to the ground potential.

[0047] Some models of DC synthetic electric field measuring instruments are not provided with a cover. When measuring the synthetic electric field, the metal shell of the DC synthetic electric field measuring instrument is connected to the ground via a low-resistance wire, thereby achieving grounding of the shell of the DC synthetic electric field measuring instrument.

[0048] During calibration, depending on whether there is a cover or not, it is necessary to flexibly adjust the grounding method of the grounding lead and choose whether to use the grounding plate; if there is a cover, use the cover directly as the grounding plate, and if there is no cover, a grounding plate needs to be used.

[0049] The portable DC synthetic electric field measuring instrument calibration device of the embodiment of the present invention comprises:

[0050] Insulating columns, high-voltage plates and control boxes are arranged in sequence from bottom to top in the vertical direction;

[0051] A grounding lead support arranged horizontally and spaced apart from the high voltage plate;

[0052] The ground lead from the control box;

[0053] When calibrating a DC synthetic electric field measuring instrument provided with a cover plate, the calibration device is vertically placed above the probe of the DC synthetic electric field measuring instrument to be calibrated, and the insulating column is connected to the cover plate;

[0054] The moving plate hole of the probe of the DC synthetic electric field measuring instrument to be calibrated is aligned with the through hole on the cover plate;

[0055] The grounding lead is away from the control box and extends along a first horizontal direction across a first distance, then extends along the top end of the grounding lead support to the bottom end of the grounding lead support, and after extending along a second horizontal direction across a second distance, is connected to the housing of the DC synthetic electric field measuring instrument to be calibrated, wherein the housing and the cover plate are connected at ground potential;

[0056] The DC synthetic electric field measuring instrument to be calibrated is calibrated according to the nominal electrostatic field formed in the space opposite to the high voltage plate and the cover plate.

[0057] Specifically, it also includes:

[0058] A grounding plate connected to the insulating column, which is provided with a calibration hole;

[0059] When calibrating a DC synthetic electric field measuring instrument without a cover plate, the calibration device is vertically placed above the probe of the DC synthetic electric field measuring instrument to be calibrated, and the moving plate hole of the probe of the DC synthetic electric field measuring instrument to be calibrated is aligned with the calibration hole of the grounding plate;

[0060] The grounding lead is away from the control box and extends along a first horizontal direction across a first distance, then extends along the top of the grounding lead support to the bottom of the grounding lead support, and after crossing a second distance along a second horizontal direction, is connected to the housing of the DC synthetic electric field measuring instrument to be calibrated, wherein the housing is connected to the grounding electrode at ground potential;

[0061] The DC synthetic electric field measuring instrument to be calibrated is calibrated according to the nominal electrostatic field formed in the space opposite to the high voltage plate and the ground plate.

[0062] Specifically, the first distance is not greater than the second distance;

[0063] The first distance is not less than 50cm.

[0064] Specifically, the control box is provided with a battery module, a DC high voltage module and a polarity switching switch which are connected in sequence;

[0065] The battery module supplies power to the DC high voltage module;

[0066] The ground terminal of the DC high voltage module is connected to the ground lead in the control box;

[0067] The DC high voltage module is also connected to a polarity switching switch, and the polarity switching switch is used to switch the high voltage plate to connect to the positive voltage end or the negative voltage end of the DC high voltage module.

[0068] Specifically, the DC high voltage module includes a positive voltage module and a negative voltage module;

[0069] The ground terminal of the positive voltage module and the ground terminal of the negative voltage module are respectively connected to the ground lead at the ground potential;

[0070] The polarity switching switch connects the positive voltage end of the positive voltage module to the high voltage plate, or connects the negative voltage end of the negative voltage module to the high voltage plate.

[0071] Specifically, a voltage regulating module and a start switch are also provided in the control box;

[0072] The battery module is connected to the DC high voltage module via a start switch;

[0073] The DC high voltage module is also connected to the voltage regulating module, and the voltage regulating module regulates the magnitude of the output voltage at the high voltage end of the DC high voltage module.

[0074] Specifically, the voltage adjustment module is a manual knob;

[0075] The polarity switching switch is a manual button;

[0076] The start switch is a manual button.

[0077] Specifically, the positive voltage terminal or the negative voltage terminal of the DC high voltage module is vertically led out from the control box through the high voltage lead wire, and is connected to the high voltage plate after passing through the bottom plate of the control box;

[0078] The grounding lead is led out from the top plate close to the control box to ensure that the grounding lead is higher than the high-voltage plate in the first horizontal direction.

[0079] Specifically, the vertical distance between the ground plate and the high voltage plate is 2-8 cm;

[0080] The vertical distance between the grounding plate and the cover plate of the DC synthetic electric field measuring instrument to be calibrated is 2-8 cm.

[0081] Specifically, the bottom plate of the control box is made of insulating material so that the control box is insulated from the high-voltage plate.

[0082] The portable DC synthetic electric field measuring instrument calibration device of the embodiment of the present invention can flexibly generate the nominal electrostatic field required for the synthetic electric field measuring instrument calibration, and can be conveniently and efficiently used for the on-site calibration of the synthetic electric field measuring instrument. When the difference between the electric field strength measured by the synthetic electric field measuring instrument and the generated nominal electrostatic field is large, the measurement error of the DC synthetic electric field measuring instrument can be eliminated by adjusting the synthetic electric field measuring instrument, thereby ensuring the accuracy of the DC synthetic electric field test of the DC transmission line and the substation on site.

[0083] like Figure 1 As shown, a portable DC synthetic electric field measuring instrument calibration device according to an embodiment of the present invention comprises:

[0084] Along the vertical direction, from bottom to top, the grounding plate 1, the insulating column 2, the high-voltage plate 3 and the control box 4 are arranged in sequence;

[0085] A grounding lead support 5 is arranged horizontally and spaced apart from the high voltage plate 3;

[0086] A ground lead 61 led out from the control box 4;

[0087] The grounding plate 1 and the high voltage plate 3 are flat plate structures.

[0088] In order to measure the uniform nominal electric field formed in the space between the grounding plate 1 and the high voltage plate 3, a calibration hole 11 (such as Figure 1 As shown), the calibration hole 11 is adapted to the shape or size of the moving plate hole of the synthetic electric field measuring instrument probe to be calibrated.

[0089] In a specific implementation, the insulating column 2 is made of insulating material, and at least four of them are provided. The connecting line of the projections of the insulating columns along the vertical direction forms a rectangle, a square or a circle.

[0090] The insulating column 2 allows a preset distance between the grounding plate 1 or the cover plate and the high-voltage plate 3 ; a nominal electrostatic field is formed in the space between the high-voltage plate 3 and the grounding plate 1 .

[0091] In a specific implementation, the insulating column 2 is threadedly connected to the high-voltage plate 3 at one end thereof;

[0092] In a specific implementation, the other end of the insulating column 2 is threadedly connected to the grounding plate 1 .

[0093] After a voltage of a preset value is applied, a uniform nominal electric field is formed in the space opposite to the grounding plate 1 and the high-voltage plate 3 to serve as a standard source for calibrating the measuring instrument 100 to be calibrated.

[0094] To avoid interference to the electric field caused by the grounding lead wire 61 when the grounding terminal in the control box 4 is led to the grounding plate, the grounding lead wire 61 is too close to the electric field. Figure 1 As shown, after being led out from the control box 4, the grounding lead 61 moves away from the control box 4 and crosses a first distance along a first horizontal direction, then extends along the top of the grounding lead support 5 to the bottom of the grounding lead support 5 (supported by the grounding lead support), and continues along the ground or slightly above the ground along a second horizontal direction to cross a second distance, and then is electrically connected to the housing of the measuring instrument 100 to be calibrated at the ground potential; the housing (metal) of the measuring instrument 100 to be calibrated and the cover plate ( Figure 1 Not shown) or connected to the ground plate 1.

[0095] Specifically, the first distance is not greater than the second distance; the first distance is not greater than 50 cm.

[0096] Since then, the grounding end of the high voltage module is connected to the grounding lead 61, the housing of the measuring instrument 100 to be calibrated, and the cover plate ( Figure 1 It is connected to the ground plate 1 (not shown) or the ground plate 1 and is maintained at ground potential.

[0097] It should be understood that, during calibration or measurement, the housing of the DC synthetic electric field measuring instrument to be measured is grounded; therefore, the grounding lead or grounding plate is ultimately connected to the earth.

[0098] like Figure 2 As shown, the control box 4 is provided with a battery module 81 , a DC high voltage module, a polarity switching switch 83 , a voltage regulating module 84 and a start switch 85 .

[0099] Specifically, the battery module 81 in the control box is connected to the DC high voltage module via the start switch 85 to supply power to the DC high voltage module;

[0100] The ground terminal of the DC high voltage module is connected to the ground lead 61;

[0101] The DC high voltage module is also connected to the polarity switching switch 83; the polarity switching switch 83 is used to switch the high voltage plate 3 to the positive voltage terminal or the negative voltage terminal of the DC high voltage module.

[0102] When the high-voltage plate 3 is connected to the positive voltage terminal of the DC high-voltage module, the uniform nominal electric field in the space opposite to the ground plate 1 and the high-voltage plate 3 is vertically directed from the high-voltage plate 3 to the ground plate 1;

[0103] When the high-voltage plate 3 is connected to the negative voltage terminal of the DC high-voltage module, the uniform nominal electric field in the space opposite to the ground plate 1 and the high-voltage plate 3 is vertically directed from the high-voltage plate 3 to the ground plate 1 .

[0104] When implementing it, Figure 2As shown, the DC high voltage module includes a positive voltage module 821 and a negative voltage module 822; the ground end of the positive voltage module 821 and the ground end of the negative voltage module 822 are respectively connected to the ground lead 61; the polarity switching switch 83 connects the positive voltage end of the positive voltage module 821 to the high voltage plate 3, or connects the negative voltage end of the negative voltage module 822 to the high voltage plate 3.

[0105] The DC high voltage module is also connected to the voltage regulating module 84 , which regulates the magnitude of the high voltage output voltage of the DC high voltage module and displays the magnitude of the high voltage output voltage of the DC high voltage module through the voltage display meter 86 .

[0106] In a specific implementation, the voltage regulating module 84 is a manual knob; the polarity switching switch 83 is a manual button; and the start switch 85 is a manual button.

[0107] After the start switch 85 is pressed, the grounding plate is at ground potential, the high-voltage plate is at the high-voltage end, and a uniform nominal electric field is formed in the space opposite to the grounding plate and the high-voltage plate.

[0108] In a specific implementation, the control box bottom plate 42 is made of insulating material, so that the control box is insulated from the high-voltage plate 3 .

[0109] like Figure 3 As shown, the positive voltage terminal or the negative voltage terminal of the DC high voltage module is vertically led out from the control box 4 through the high voltage lead 44, and is connected to the high voltage plate 3 after passing through the control box bottom plate 42.

[0110] In specific implementation, the high voltage lead 44 is either welded to the high voltage plate or threadedly connected to the high voltage plate to achieve a firm electrical connection.

[0111] like Figure 3 As shown, the grounding end of the DC high voltage module is led out from the control box 4 through the grounding lead 45, passes through the control box side plate 43, and finally connects to the grounding plate 1 ( Figure 3 The cover of the DC synthetic electric field measuring instrument (not shown) or the one to be calibrated is connected to the ground potential.

[0112] In a specific implementation, the grounding electrode plate 1 and the high-voltage electrode plate 3 have the same shape and size, and their horizontal projections are rectangular, square or circular.

[0113] Preferably, the projection of the grounding electrode plate 1 and the high-voltage electrode plate 3 in the horizontal direction is a square with a side length of 25-50 cm.

[0114] In addition, the shapes and sizes of the grounding plate 1 and the high-voltage plate 3 are adapted to the cover of the DC synthetic electric field measuring instrument to be calibrated.

[0115] In a specific implementation, the grounding plate 1 and the high voltage plate 3 are conductive metal plates, such as aluminum plates.

[0116] In specific implementation, the ground lead support 5 is made of insulating material or metal material; Figure 1 As shown, its height in the vertical direction is not lower than the height from the ground of the control box top plate 41 arranged above the DC synthetic electric field measuring instrument to be calibrated.

[0117] Preferably, the grounding lead 61 is led out from the top plate 41 close to the control box 4, so as to ensure that the grounding lead 61 is higher than the high-voltage plate 3 in the first horizontal direction.

[0118] In a specific implementation, the grounding lead support 5 is a self-supporting mechanism, and after being erected, its height in the vertical direction is not lower than the height of the control box top plate 41 from the ground.

[0119] In a specific implementation, the distance between the grounding plate 1 and the high voltage plate 3 is adjusted by adjusting the height of the insulating column 2 .

[0120] Correspondingly, after the self-supporting structure is erected in an adjustable height along the vertical direction, it can be ensured that the grounding lead 61 is higher than the high-voltage plate 3 in the first horizontal direction.

[0121] In a specific implementation, the vertical distance between the grounding plate 1 or the cover of the DC synthetic electric field measuring instrument to be calibrated and the high voltage plate 3 is 2-8 cm.

[0122] Specifically, when in use, the portable DC synthetic electric field measuring instrument calibration device of this embodiment determines the nominal electric field E to be generated as the standard source according to the electric field strength measurement range or rated field strength of the DC synthetic electric field measuring instrument to be calibrated;

[0123] Further, when the voltage level is known, the height h of the insulating column 2 is determined according to U=E / h;

[0124] Furthermore, when the height h of the insulating column 2 is known, the voltage value to be applied to the high-voltage plate is determined according to U=E / h, and the voltage regulating module 84 regulates the high-voltage end output voltage of the DC high-voltage module.

[0125] For example, when the field strength E is 30 kV / m, when the vertical distance between the grounding plate 1 or the cover of the DC synthetic electric field measuring instrument to be calibrated and the high-voltage plate 3 is 2-8 cm, the high-voltage end output voltage of the DC high-voltage module is 600V-2400V.

[0126] Specifically, when the grounding plate is connected to the ground potential, the moving plate hole of the DC synthetic electric field measuring instrument to be calibrated is aligned with the calibration hole, and the probe and the grounding plate are in the same plane.

[0127] Specifically, when the cover plate is used as a grounding plate and connected to the ground potential, the moving plate hole of the DC synthetic electric field measuring instrument probe to be calibrated is aligned with the through hole on the cover plate, and the probe and the grounding plate are kept in the same plane.

[0128] Keeping the probe and the grounding plate in the same plane can ensure that the DC synthetic electric field measuring instrument to be calibrated can accurately measure the uniform nominal electric field in the space opposite to the grounding plate 1 and the high-voltage plate 3 or the cover plate.

[0129] Use scenario 1:

[0130] The DC synthetic electric field measuring instrument is not provided with a cover plate that can be used as a grounding plate.

[0131] The portable direct current synthetic electric field measuring instrument calibration device is vertically placed above the probe of the direct current synthetic electric field measuring instrument to be calibrated.

[0132] The grounding lead 61 is led out of the control box 4, away from the control box 4 and across a first distance in the first horizontal direction, then extended along the top of the grounding lead support 5 to the bottom of the grounding lead support 5 (supported by the grounding lead support), and continues along the ground or slightly above the ground along the second horizontal direction to cross a second distance, and then connected to the housing of the measuring instrument 100 to be calibrated, and the housing of the measuring instrument 100 to be calibrated is connected to the ground electrode 1 at the ground potential. At this time, the grounding lead 61 is in a tensioned state along the first horizontal direction or along the second horizontal direction.

[0133] The polarity of the output high voltage is adjusted using the polarity switching switch 83; the magnitude of the output high voltage is adjusted using the voltage regulating module 84; the start switch 85 is turned on (eg, pressed) to generate an electrostatic field that meets the calibration requirements between the ground plate and the high voltage plate.

[0134] Obtain the reading of the DC synthetic electric field meter to be calibrated, and when there is a large difference between the electric field strength measured by the synthetic electric field meter and the generated nominal electrostatic field, adjust the synthetic electric field meter to eliminate the measurement error of the DC synthetic electric field meter.

[0135] Use scenario 2:

[0136] When the DC synthetic electric field measuring instrument has a cover, the cover is used as a grounding plate;

[0137] At this time, the grounding plate on the calibration device needs to be removed.

[0138] After the grounding electrode plate of the portable DC synthetic electric field measuring instrument calibration device is removed, the portable DC synthetic electric field measuring instrument calibration device is vertically placed above the probe of the DC synthetic electric field measuring instrument to be calibrated.

[0139] The grounding lead 61 is led out of the control box 4, away from the control box 4 and across a first distance in the first horizontal direction, then extended along the top of the grounding lead support 5 to the bottom of the grounding lead support 5 (supported by the grounding lead support), and continues along the ground or slightly above the ground along the second horizontal direction to cross a second distance, and then connected to the housing of the measuring instrument 100 to be calibrated, and the housing of the measuring instrument 100 to be calibrated is connected to the ground electrode 1 at the ground potential. At this time, the grounding lead 61 is in a tensioned state along the first horizontal direction or along the second horizontal direction.

[0140] The polarity of the output high voltage is adjusted using the polarity switching switch 83; the magnitude of the output high voltage is adjusted using the voltage regulating module 84; the start switch 85 is turned on (eg, pressed) to generate an electrostatic field that meets the calibration requirements between the ground plate and the high voltage plate.

[0141] Obtain the reading of the DC synthetic electric field meter to be calibrated, and when there is a large difference between the electric field strength measured by the synthetic electric field meter and the generated nominal electrostatic field, adjust the synthetic electric field meter to eliminate the measurement error of the DC synthetic electric field meter.

[0142] In a portable DC synthetic electric field measuring instrument calibration device of one embodiment, the distance between the grounding plate and the high-voltage plate is 3.15 cm; the grounding plate and the high-voltage plate are square thick aluminum plates with a side length of 28 cm.

[0143] The test results of the large calibration device and the calibration device of this embodiment are compared, and the results are shown in Table 1. Except for the zero point, the values ​​of the two are the same at other test points, that is, the accuracy is equivalent to that of the large calibration device. Therefore, the device of this embodiment can replace the large calibration device and be used to calibrate the DC synthetic electric field measuring instrument on site.

[0144] Table 1 compares the measurement accuracy of the large calibration device and the calibration device of the embodiment of the present invention

[0145]

[0146]

[0147] In summary, in order to address the problem of lack of effective calibration devices in the DC synthetic electric field measurement process in DC power transmission projects, the portable DC synthetic electric field measuring instrument calibration device of this embodiment can conveniently and reliably calibrate the DC synthetic electric field measuring instrument on site, thereby determining the measurement accuracy of the DC synthetic electric field measuring instrument during long-term use and multiple transportations.

[0148] The portable DC synthetic electric field measuring instrument calibration device of the embodiment of the present invention can be carried together with the DC synthetic electric field measuring instrument to calibrate the DC synthetic electric field measuring instrument on site. It has a small size, light weight, and high accuracy in generating an electrostatic field, thereby ensuring the accuracy of on-site calibration.

[0149] The invention has been described above with reference to a few embodiments. However, it is known to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0150] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / / the [means, component, etc.]" are to be openly interpreted as at least one instance of a means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily have to be performed in the exact order disclosed, unless explicitly stated otherwise.

Claims

1. A portable DC synthetic electric field measuring instrument calibration device, It is characterized in that Used to calibrate DC synthetic electric field measuring instruments on-site in DC transmission lines using nominal electrostatic fields, including: Insulating columns, high-voltage plates and control boxes are arranged in sequence from bottom to top in the vertical direction; A grounding lead support arranged horizontally and spaced apart from the high voltage plate; A ground lead extending from the control box; The control box is provided with a battery module, a DC high voltage module and a polarity switching switch which are connected in sequence; The battery module supplies power to the DC high voltage module; The ground terminal of the DC high voltage module is connected to the ground lead in the control box; The DC high-voltage module is also connected to a polarity switching switch, and the polarity switching switch is used to switch the high-voltage plate to the positive voltage end or the negative voltage end of the DC high-voltage module; the positive voltage end or the negative voltage end of the DC high-voltage module is vertically led out from the control box through a high-voltage lead, and is connected to the high-voltage plate after passing through the bottom plate of the control box; The grounding lead is led out from the top plate close to the control box to ensure that the grounding lead is higher than the high-voltage plate in the first horizontal direction; When calibrating a DC synthetic electric field measuring instrument provided with a cover plate, the calibration device is vertically placed above the probe of the DC synthetic electric field measuring instrument to be calibrated, the insulating column is connected to the cover plate, and the cover plate is used as a grounding electrode plate; The moving plate hole of the probe of the DC synthetic electric field measuring instrument to be calibrated is aligned with the through hole on the cover plate; The grounding lead is away from the control box and extends along a first horizontal direction across a first distance, then extends along the top of the grounding lead support to the bottom of the grounding lead support, and after crossing a second distance along a second horizontal direction, is connected to the housing of the DC synthetic electric field measuring instrument to be calibrated; Wherein, the housing of the DC synthetic electric field measuring instrument to be calibrated is connected to the cover plate at ground potential; The first distance is not greater than the second distance; the first distance is not less than 50 cm; the grounding lead is in a tensioned state along the first horizontal direction or along the second horizontal direction; Calibrate the DC synthetic electric field measuring instrument to be calibrated according to the nominal electrostatic field formed in the space between the high voltage plate and the cover plate; and further include: A grounding plate connected to the insulating column, which is provided with a calibration hole; When calibrating a DC synthetic electric field measuring instrument without a cover plate, the calibration device is vertically placed above the probe of the DC synthetic electric field measuring instrument without a cover plate to be calibrated, and the moving plate hole of the probe of the DC synthetic electric field measuring instrument without a cover plate to be calibrated is aligned with the calibration hole of the grounding electrode plate; Among them, the shell of the probe of the DC synthetic electric field measuring instrument to be calibrated without a cover is connected to the ground plate at ground potential; the DC synthetic electric field measuring instrument to be calibrated without a cover is calibrated according to the nominal electrostatic field formed in the space opposite to the high-voltage plate and the ground plate.

2. The calibration device according to claim 1, It is characterized in that The DC high voltage module includes a positive voltage module and a negative voltage module; The grounding terminal of the positive voltage module and the grounding terminal of the negative voltage module are respectively connected to the grounding lead at a ground potential; The polarity switching switch connects the positive voltage end of the positive voltage module to the high voltage plate, or connects the negative voltage end of the negative voltage module to the high voltage plate.

3. The calibration device according to claim 1, It is characterized in that The control box is also provided with a voltage regulating module and a start switch; The battery module is connected to the DC high voltage module via a start switch; The DC high-voltage module is also connected to a voltage regulating module, and the voltage regulating module regulates the magnitude of the output voltage at the high-voltage end of the DC high-voltage module.

4. The calibration device according to claim 3, It is characterized in that The voltage adjustment module is a manual knob; The polarity switching switch is a manual button; The starting switch is a manual button.

5. The calibration device according to claim 1, It is characterized in that The vertical distance between the grounding plate and the high voltage plate is 2-8 cm; The vertical distance between the grounding electrode and the cover of the DC synthetic electric field measuring instrument to be calibrated is 2-8 cm.

6. The calibration device according to claim 1, It is characterized in that The bottom plate of the control box is made of insulating material so that the control box is insulated from the high-voltage plate.

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