CN112230173A - Portable direct current synthetic electric field measuring instrument calibrating device - Google Patents
Portable direct current synthetic electric field measuring instrument calibrating device Download PDFInfo
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- 230000005684 electric field Effects 0.000 title claims abstract description 125
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- 238000004164 analytical calibration Methods 0.000 abstract description 6
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- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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Abstract
The invention discloses a portable direct current synthetic electric field measuring instrument calibration device. It includes: the insulating column, the high-voltage polar plate and the control box are sequentially arranged along the vertical direction from bottom to top; a ground lead support disposed in a horizontal direction at an interval from the high voltage plate; a grounding lead wire led out from the inside of the control box; when the direct current synthetic electric field measuring instrument provided with the cover plate is calibrated, the calibrating device is vertically placed above a probe of the direct current synthetic electric field measuring instrument to be calibrated; a moving sheet hole of a probe of the direct current synthetic electric field measuring instrument to be calibrated is aligned with a through hole on the cover plate; the insulating column is connected with the cover plate; the grounding lead is connected with a shell of the direct current synthetic electric field measuring instrument to be calibrated, wherein the shell is connected with the cover plate at the ground potential; and calibrating the direct current synthetic electric field measuring instrument to be calibrated according to the nominal electrostatic field formed in the space between the high-voltage polar plate and the cover plate. The calibration device can be conveniently and efficiently used for field calibration of the synthetic electric field measuring instrument.
Description
Technical Field
The invention belongs to the technical field of power transmission and transformation engineering/electromagnetic compatibility, and particularly relates to a portable direct-current synthetic electric field measuring instrument calibration device.
Background
In recent years, the construction of direct current transmission lines in China is rapidly developed. As the main electromagnetic environment parameters of the direct current transmission line and the transformer substation, the monitoring of the direct current synthetic electric field is always an important work in the environmental evaluation. At present, the measurement of the direct current composite electric field is mainly completed by a composite electric field measuring instrument.
Direct current lines are generally used to achieve long-distance point-to-point transmission, and therefore, monitoring of the combined electric field is generally performed along the lines, and the monitoring period is long. Because the monitoring instrument is in the transportation process most of the time, the accuracy of the monitoring instrument is difficult to guarantee, and the calibration needs to be carried out before the field test. At present, a calibration device for field calibration is large in size and inconvenient to transition, so that the field calibration implementation difficulty is large.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a field calibration device of a direct current synthetic electric field measuring instrument, which aims to solve the problems of low efficiency and inconvenient implementation when the direct current synthetic electric field measuring instrument is calibrated on site.
The invention provides a portable direct current synthesis electric field measuring instrument calibration device, which comprises:
the insulating column, the high-voltage polar plate and the control box are sequentially arranged along the vertical direction from bottom to top;
a ground lead support disposed in a horizontal direction at an interval from the high voltage plate;
a grounding lead wire led out from the inside of the control box;
when the direct current synthetic electric field measuring instrument provided with the cover plate is calibrated, the calibrating device is vertically placed above a probe of the direct current synthetic electric field measuring instrument to be calibrated, and the insulating column is connected with the cover plate;
a moving sheet hole of a probe of the direct current synthetic electric field measuring instrument to be calibrated is aligned with a through hole on the cover plate;
the grounding lead is far away from the control box, spans a first distance along a first horizontal direction, extends to the bottom end of the grounding lead support column along the top end of the grounding lead support column, spans a second distance along a second horizontal direction, and is connected with a shell of the direct current synthetic electric field measuring instrument to be calibrated, wherein the shell is connected with the cover plate at ground potential;
and calibrating the direct current synthetic electric field measuring instrument to be calibrated according to a nominal electrostatic field formed in the space where the high-voltage polar plate is opposite to the cover plate.
Specifically, the method further comprises the following steps:
the grounding polar plate is connected with the insulating column and is provided with a calibration hole;
when the direct current synthetic electric field measuring instrument without the cover plate is calibrated, the calibrating device is vertically placed above a probe of the direct current synthetic electric field measuring instrument to be calibrated, and a moving plate hole of the probe of the direct current synthetic electric field measuring instrument to be calibrated is aligned with a calibrating hole of the grounding polar plate;
the grounding lead is far away from the control box, spans a first distance along a first horizontal direction, extends to the bottom end of the grounding lead support column along the top end of the grounding lead support column, spans a second distance along a second horizontal direction, and is connected with a shell of the direct current synthetic electric field measuring instrument to be calibrated, wherein the shell is connected with the grounding polar plate at ground potential;
and calibrating the direct current synthetic electric field measuring instrument to be calibrated according to a nominal electrostatic field formed in the space where the high-voltage polar plate is opposite to the grounding polar plate.
Specifically, the first distance is not greater than the second distance;
the first distance is not less than 50 cm.
Specifically, a battery module, a direct current high-voltage module and a polarity change-over switch which are connected in sequence are arranged in the control box;
the battery module supplies power to the direct-current high-voltage module;
the grounding end of the direct current high-voltage module is connected with a grounding lead in the control box;
the direct-current high-voltage module is further connected with a polarity change-over switch, and the polarity change-over switch is used for connecting the high-voltage pole plate with the positive voltage end or the negative voltage end of the direct-current high-voltage module in a switching mode.
Specifically, the direct current high voltage module comprises a positive voltage module and a negative voltage module;
the grounding end of the positive voltage module and the grounding end of the negative voltage module are respectively connected with the grounding lead wire by ground potential;
the polarity switch connects the positive voltage end of the positive voltage module with the high voltage pole plate, or connects the negative voltage end of the negative voltage module with the high voltage pole plate.
Specifically, a voltage regulating module and a starting switch are also arranged in the control box;
the battery module is connected with the direct-current high-voltage module through a starting switch;
the direct current high-voltage module is further connected with a voltage regulating module, and the voltage regulating module regulates the output voltage of the high-voltage end of the direct current high-voltage module.
Specifically, the voltage regulation module is a manual knob;
the polarity switch is a manual key;
the starting switch is a manual key.
Specifically, a positive voltage end or a negative voltage end of the direct current high-voltage module is vertically led out of the control box through a high-voltage lead, penetrates through a bottom plate of the control box and is connected with a high-voltage pole plate;
the grounding lead is led out from the top plate close to the control box so as to ensure that the grounding lead is higher than the high-voltage polar plate in the first horizontal direction.
Specifically, the distance between the grounding polar plate and the high-voltage polar plate along the vertical direction is 2-8 cm;
the distance between the grounding polar plate and a cover plate of the direct current synthetic electric field measuring instrument to be calibrated along the vertical direction is 2-8 cm.
Specifically, the bottom plate of the control box is made of an insulating material, so that the control box is insulated from the high-voltage pole plate.
The portable direct-current synthetic electric field measuring instrument calibration device provided by the invention can flexibly generate the nominal electrostatic field required by the calibration of the synthetic electric field measuring instrument, can be conveniently and efficiently used for the field calibration of the synthetic electric field measuring instrument, and ensures the accuracy of the direct-current synthetic electric field test of a direct-current transmission line and a transformer substation on the field.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a schematic structural diagram of a control box of a calibration device of a portable direct current synthetic electric field measuring instrument according to a preferred embodiment of the invention;
FIG. 2 is a schematic diagram of the components of a control box of the calibration device according to the preferred embodiment of the present invention;
fig. 3 is a schematic diagram of the wiring of the high voltage lead and the grounding lead in the calibration device of the portable dc synthetic electric field measuring instrument according to the preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The calibration of the direct current synthetic electric field measuring instrument is calibrated by adopting a nominal electrostatic field. The existing calibration device for calibrating the direct current synthetic electric field measuring instrument on site is large in size and inconvenient in transition along the line, so that the implementation difficulty of the calibration on site is high, and the implementation rate is low. It is urgent and necessary to design and develop a calibration device for a portable dc combined electric field measuring instrument.
Some types of dc composite electric field measuring instruments include a cover plate disposed on the top thereof; the cover plate is provided with a through hole matched with the moving plate hole. When the composite electric field is measured, the cover plate needs to be grounded; specifically, the metal cover plate is connected to the ground through a low-resistance wire (having a large wire diameter), or the metal housing of the dc synthetic electric field measuring instrument is connected to the ground through a low-resistance wire (having a large wire diameter), so that the metal cover plate is grounded, that is, at the ground potential.
Some types of direct current synthetic electric field measuring instruments are not provided with a cover plate. When the synthesized electric field is measured, the metal shell of the direct current synthesized electric field measuring instrument is connected with the ground through a low-resistance lead wire, so that the shell of the direct current synthesized electric field measuring instrument is grounded.
During calibration, the grounding mode of the grounding lead is flexibly adjusted and whether a grounding polar plate is used or not is selected according to the existence of the cover plate; the cover plate is directly used as the grounding pole plate when the cover plate is arranged, and the grounding pole plate is used when the cover plate is not arranged.
The portable direct current synthesis electric field measuring instrument calibration device of the embodiment of the invention comprises:
the insulating column, the high-voltage polar plate and the control box are sequentially arranged along the vertical direction from bottom to top;
a ground lead support disposed in a horizontal direction at an interval from the high voltage plate;
a grounding lead wire led out from the inside of the control box;
when the direct current synthetic electric field measuring instrument provided with the cover plate is calibrated, the calibrating device is vertically placed above a probe of the direct current synthetic electric field measuring instrument to be calibrated, and the insulating column is connected with the cover plate;
a moving sheet hole of a probe of the direct current synthetic electric field measuring instrument to be calibrated is aligned with a through hole on the cover plate;
the grounding lead is far away from the control box, spans a first distance along a first horizontal direction, extends to the bottom end of the grounding lead support along the top end of the grounding lead support, spans a second distance along a second horizontal direction, and is connected with a shell of the direct current synthetic electric field measuring instrument to be calibrated, wherein the shell is connected with the cover plate through a ground potential;
and calibrating the direct current synthetic electric field measuring instrument to be calibrated according to the nominal electrostatic field formed in the space between the high-voltage polar plate and the cover plate.
Specifically, the method further comprises the following steps:
the grounding polar plate is connected with the insulating column and is provided with a calibration hole;
when the direct current synthetic electric field measuring instrument without the cover plate is calibrated, the calibrating device is vertically placed above a probe of the direct current synthetic electric field measuring instrument to be calibrated, and a moving sheet hole of the probe of the direct current synthetic electric field measuring instrument to be calibrated is aligned with a calibrating hole of the grounding polar plate;
the grounding lead is far away from the control box, spans a first distance along a first horizontal direction, extends to the bottom end of the grounding lead support column along the top end of the grounding lead support column, spans a second distance along a second horizontal direction, and is connected with a shell of the direct current synthetic electric field measuring instrument to be calibrated, wherein the shell is connected with the grounding polar plate at ground potential;
and calibrating the direct current synthetic electric field measuring instrument to be calibrated according to the nominal electrostatic field formed in the space where the high-voltage polar plate is opposite to the grounding polar plate.
Specifically, the first distance is not greater than the second distance;
the first distance is not less than 50 cm.
Specifically, a battery module, a direct current high-voltage module and a polarity change-over switch which are connected in sequence are arranged in the control box;
the battery module supplies power to the direct-current high-voltage module;
the grounding end of the direct current high-voltage module is connected with a grounding lead in the control box;
the direct-current high-voltage module is also connected with a polarity change-over switch, and the polarity change-over switch is used for connecting the high-voltage pole plate with the positive voltage end or the negative voltage end of the direct-current high-voltage module in a switching manner.
Specifically, the direct-current high-voltage module comprises a positive voltage module and a negative voltage module;
the grounding end of the positive voltage module and the grounding end of the negative voltage module are respectively connected with the grounding lead through the ground potential;
the polarity switch connects the positive voltage end of the positive voltage module with the high voltage pole plate, or connects the negative voltage end of the negative voltage module with the high voltage pole plate.
Specifically, a voltage regulating module and a starting switch are also arranged in the control box;
the battery module is connected with the direct-current high-voltage module through the starting switch;
the direct current high-voltage module is also connected with the voltage regulating module, and the voltage regulating module regulates the output voltage of the high-voltage end of the direct current high-voltage module.
Specifically, the voltage regulation module is a manual knob;
the polarity switch is a manual key;
the starting switch is a manual key.
Specifically, a positive voltage end or a negative voltage end of the direct-current high-voltage module is vertically led out of the control box through a high-voltage lead, penetrates through a bottom plate of the control box and is connected with a high-voltage pole plate;
the grounding lead is led out from the top plate close to the control box so as to ensure that the grounding lead is higher than the high-voltage polar plate in the first horizontal direction.
Specifically, the distance between the grounding polar plate and the high-voltage polar plate along the vertical direction is 2-8 cm;
the distance between the grounding polar plate and a cover plate of the direct current synthetic electric field measuring instrument to be calibrated along the vertical direction is 2-8 cm.
Specifically, the bottom plate of the control box is made of an insulating material, so that the control box is insulated from the high-voltage pole plate.
The calibration device of the portable direct-current synthetic electric field measuring instrument can flexibly generate the nominal electrostatic field required by the calibration of the synthetic electric field measuring instrument, and can be conveniently and efficiently used for the field calibration of the synthetic electric field measuring instrument. When the difference between the electric field intensity measured by the synthetic electric field measuring instrument and the generated nominal electrostatic field is large, the measuring error of the direct current synthetic electric field measuring instrument can be eliminated by adjusting the synthetic electric field measuring instrument, and the accuracy of the direct current synthetic electric field test on the direct current transmission line and the transformer substation on site is ensured.
As shown in fig. 1, a calibration device for a portable dc combined electric field measuring instrument according to an embodiment of the present invention includes:
the grounding polar plate 1, the insulating column 2, the high-voltage polar plate 3 and the control box 4 are sequentially arranged from bottom to top along the vertical direction;
a ground lead support 5 provided in the horizontal direction at a distance from the high-voltage electrode plate 3;
a ground lead 61 led out from the inside of the control box 4;
wherein, the grounding polar plate 1 and the high-voltage polar plate 3 are of flat plate structures.
In order to measure the uniform nominal electric field formed by the space between the grounding polar plate 1 and the high-voltage polar plate 3, in specific implementation, the center of the grounding polar plate 1 is provided with a calibration hole 11 (as shown in fig. 1), and the calibration hole 11 is matched with the shape or size of a moving plate hole of a synthetic electric field measuring instrument probe to be calibrated.
In specific implementation, the insulating columns 2 are made of insulating materials and are arranged at least 4, and connecting lines of projections of the insulating columns along the vertical direction form a rectangle, a square or a circle.
The insulating column 2 enables a preset distance to be reserved between the grounding polar plate 1 or the cover plate and the high-voltage polar plate 3; and a nominal electrostatic field is formed in the space where the high-voltage polar plate 3 and the grounding polar plate 1 are opposite.
In specific implementation, the insulating column 2 is in threaded connection with the high-voltage pole plate 3 at one end of the insulating column;
in specific implementation, the other end of the insulating column 2 is in threaded connection with the grounding polar plate 1.
After the voltage with the preset value is applied, a uniform nominal electric field is formed in the space where the grounding polar plate 1 and the high-voltage polar plate 3 are opposite to each other, so as to be used as a standard source for calibrating the measuring instrument 100 to be calibrated.
In order to avoid interference to the electric field caused by the grounding lead being too close to the electric field when the grounding end in the control box 4 is led to the grounding polar plate through the grounding lead 61, as shown in fig. 1, after being led out from the control box 4, the grounding lead 61 is far away from the control box 4 and spans a first distance along a first horizontal direction, extends to the bottom end of the grounding lead support 5 (supported by the grounding lead support) along the top end of the grounding lead support 5, and is electrically connected with the casing of the measuring instrument 100 to be calibrated at ground potential after continuously spanning a second distance along a second horizontal direction along the ground or slightly higher than the ground; the housing (which is metal) of the meter 100 to be calibrated is connected to a cover plate (not shown in fig. 1) or to the ground plate 1.
Specifically, the first distance is not greater than the second distance; the first distance is not more than 50 cm.
From there, it is achieved that the ground of the high-voltage module is connected via the ground lead 61, the housing of the measuring instrument 100 to be calibrated, the cover plate (not shown in fig. 1) or the ground plate 1 and is held at ground potential.
It should be understood that, during calibration or measurement, the casing of the dc synthetic electric field measuring instrument to be measured is grounded; therefore, the ground lead or ground plate is eventually connected to ground.
As shown in fig. 2, the control box 4 is provided with a battery module 81, a dc high voltage module, a polarity switch 83, a voltage regulating module 84, and a start switch 85.
Specifically, a battery module 81 in the control box is connected with the direct-current high-voltage module through a starting switch 85 to supply power to the direct-current high-voltage module;
the grounding end of the direct current high-voltage module is connected with the grounding lead 61;
the direct current high voltage module is also connected with a polarity switch 83; the polarity switch 83 is used to switchably connect the high-voltage plate 3 with the positive voltage terminal or the negative voltage terminal of the dc high-voltage module.
When the high-voltage polar plate 3 is connected with the positive voltage end of the direct-current high-voltage module, a uniform nominal electric field in a space where the grounding polar plate 1 and the high-voltage polar plate 3 are opposite vertically points to the grounding polar plate 1 from the high-voltage polar plate 3;
when the high-voltage polar plate 3 is connected with the negative voltage end of the direct-current high-voltage module, a uniform nominal electric field in a space where the grounding polar plate 1 and the high-voltage polar plate 3 are opposite vertically points to the grounding polar plate 1 from the high-voltage polar plate 3.
In specific implementation, as shown in fig. 2, the dc high voltage module includes a positive voltage module 821 and a negative voltage module 822; the ground terminal of the positive voltage module 821 and the ground terminal of the negative voltage module 822 are connected to the ground lead 61, respectively; the polarity switch 83 connects the positive voltage terminal of the positive voltage module 821 to the high voltage plate 3 or connects the negative voltage terminal of the negative voltage module 822 to the high voltage plate 3.
The dc high voltage module is further connected to the voltage regulating module 84, the voltage regulating module 84 regulates the output voltage of the high voltage end of the dc high voltage module, and the voltage display meter 86 displays the output voltage of the high voltage end of the dc high voltage module.
In specific implementation, the voltage adjustment module 84 is a manual knob; the polarity switch 83 is a manual button; the start switch 85 is a manual key.
After the start switch 85 is pressed, the grounding polar plate is at ground potential, the high-voltage polar plate is at a high-voltage end, and a uniform nominal electric field is formed in a space where the grounding polar plate is opposite to the high-voltage polar plate.
In specific implementation, the control box bottom plate 42 is made of an insulating material, so that the control box is insulated from the high-voltage pole plate 3.
As shown in fig. 3, the positive voltage end or the negative voltage end of the dc high voltage module is vertically led out from the control box 4 through a high voltage lead 44, and passes through the control box bottom plate 42 to be connected to the high voltage plate 3.
In specific implementation, the high voltage lead 44 is either welded to the high voltage plate or screwed to the high voltage plate to achieve a firm electrical connection.
As shown in fig. 3, the ground terminal of the dc high voltage module is led out from the control box 4 through a ground lead 45, and passes through the control box side plate 43, and is finally connected to the ground plate 1 (not shown in fig. 3) or the cover plate of the dc synthetic electric field measuring apparatus to be calibrated at ground potential.
In specific implementation, the shapes and sizes of the grounding polar plate 1 and the high-voltage polar plate 3 are the same, and the projection in the horizontal direction is rectangular, square or circular.
Preferably, the projections of the ground plate 1 and the high voltage plate 3 in the horizontal direction are squares with sides of 25-50 cm.
In addition, the shapes and the sizes of the grounding polar plate 1 and the high-voltage polar plate 3 are matched with the cover plate of the direct current synthetic electric field measuring instrument to be calibrated.
In specific implementation, the ground plate 1 and the high voltage plate 3 are conductive metal plates, such as aluminum plates.
In specific implementation, the grounding lead support 5 is made of an insulating material or a metal material; as shown in fig. 1, the height thereof in the vertical direction is not lower than the height from the ground of the control box top plate 41 provided above the dc composite electric field measuring instrument to be calibrated.
Preferably, the ground lead 61 is led out from the top plate 41 close to the control box 4, so as to ensure that the ground lead 61 is higher than the high voltage plate 3 in the first horizontal direction.
In specific implementation, the ground lead support 5 is a self-supporting support mechanism, and the height of the ground lead support in the vertical direction is not lower than the height of the control box top plate 41 above the ground after the ground lead support is erected.
In specific implementation, the distance between the grounding polar plate 1 and the high-voltage polar plate 3 is adjusted by adjusting the height of the insulating column 2.
Accordingly, after the self-standing support mechanism is erected with the height adjustable in the vertical direction, the grounding lead 61 can be ensured to be higher than the high-voltage pole plate 3 in the first horizontal direction.
In specific implementation, the distance between the grounding polar plate 1 or the cover plate of the direct current synthetic electric field measuring instrument to be calibrated and the high-voltage polar plate 3 along the vertical direction is 2-8 cm.
Specifically, when in use, the calibration device of the portable dc combined electric field measurement instrument of the embodiment determines the nominal electric field E to be generated as the standard source according to the electric field strength measurement range or the rated field strength of the dc combined electric field measurement instrument to be calibrated;
further, when the voltage level is known, the height h of the insulating column 2 is determined according to U ═ E/h;
further, when the height h of the insulating column 2 is known, the voltage value required to be applied to the high-voltage pole plate is determined according to U ═ E/h, and the high-voltage end output voltage of the direct-current high-voltage module is regulated by the voltage regulation module 84.
For example, when the field intensity E is 30kV/m, and the vertical distance between the grounding electrode plate 1 or the cover plate of the dc synthetic electric field measuring instrument to be calibrated and the high-voltage electrode plate 3 is 2-8cm, the output voltage of the high-voltage end of the dc high-voltage module is 600V-2400V.
Specifically, when the grounding polar plate is connected with the ground potential, a moving plate hole of the direct current synthetic electric field measuring instrument to be calibrated is aligned with the calibration hole, and the probe and the grounding polar plate are in the same plane.
Specifically, when the cover plate is used as a grounding polar plate and is connected with the ground potential, the moving sheet 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, and the probe and the grounding polar plate are kept in the same plane.
The probe and the grounding polar plate are kept in the same plane, and the direct current synthetic electric field measuring instrument to be calibrated can be ensured to accurately measure the uniform nominal electric field in the space where the grounding polar plate 1 and the high-voltage polar plate 3 or the cover plate are opposite.
Using scenario 1:
the direct current synthetic electric field measuring instrument is not provided with a cover plate which can be used as a grounding polar plate.
The calibration device of the portable direct current synthetic electric field measuring instrument is vertically placed above a probe of the direct current synthetic electric field measuring instrument to be calibrated.
The grounding lead 61 is led out from the control box 4, is far away from the control box 4 and spans a first distance along a first horizontal direction, extends to the bottom end of the grounding lead support 5 along the top end of the grounding lead support 5 (supported by the grounding lead support), and continues to span a second distance along a second horizontal direction along the ground or slightly higher than the ground, and is connected with the shell of the measuring instrument 100 to be calibrated, and the shell of the measuring instrument 100 to be calibrated is connected with the grounding pole plate 1 at the ground potential. At this time, the ground lead 61 is in a tensioned state in the first horizontal direction or in the second horizontal direction.
The polarity of the output high voltage is adjusted by the polarity switching switch 83; the voltage regulating module 84 is used for regulating the magnitude of the output high voltage; the start switch 85 is turned on (e.g., depressed) to generate an electrostatic field between the ground plate and the high voltage plate that meets the calibration requirements.
And acquiring the reading of the direct current synthetic electric field measuring instrument to be calibrated, and adjusting the synthetic electric field measuring instrument to eliminate the measurement error of the direct current synthetic electric field measuring instrument when the difference between the electric field intensity measured by the synthetic electric field measuring instrument and the generated nominal electrostatic field is larger.
Usage scenario 2:
when the direct current synthetic electric field measuring instrument is provided with a cover plate, the cover plate is used as a grounding polar plate;
at this point, the ground plate on the calibration device needs to be removed.
After the grounding polar plate of the calibration device of the portable direct current synthetic electric field measuring instrument is detached, the calibration device of the portable direct current synthetic electric field measuring instrument is vertically placed above a probe of the direct current synthetic electric field measuring instrument to be calibrated.
The grounding lead 61 is led out from the control box 4, is far away from the control box 4 and spans a first distance along a first horizontal direction, extends to the bottom end of the grounding lead support 5 along the top end of the grounding lead support 5 (supported by the grounding lead support), and continues to span a second distance along a second horizontal direction along the ground or slightly higher than the ground, and is connected with the shell of the measuring instrument 100 to be calibrated, and the shell of the measuring instrument 100 to be calibrated is connected with the grounding pole plate 1 at the ground potential. At this time, the ground lead 61 is in a tensioned state in the first horizontal direction or in the second horizontal direction.
The polarity of the output high voltage is adjusted by the polarity switching switch 83; the voltage regulating module 84 is used for regulating the magnitude of the output high voltage; the start switch 85 is turned on (e.g., depressed) to generate an electrostatic field between the ground plate and the high voltage plate that meets the calibration requirements.
And acquiring the reading of the direct current synthetic electric field measuring instrument to be calibrated, and adjusting the synthetic electric field measuring instrument to eliminate the measurement error of the direct current synthetic electric field measuring instrument when the difference between the electric field intensity measured by the synthetic electric field measuring instrument and the generated nominal electrostatic field is larger.
In the calibration device of the portable direct-current composite electric field measuring instrument of one embodiment, the distance between the grounding polar plate and the high-voltage polar plate is 3.15 cm; the grounding polar plate and the high-voltage polar plate are square thick aluminum plates with the side length of 28 cm.
The test results of the large calibration device and the calibration device of this example were compared and the results are shown in table 1. The values at both test points are identical except for the zero point, i.e. comparable to the accuracy of a large calibration device. Therefore, the device of the embodiment can replace a large calibration device and be used for calibrating the direct current composite electric field measuring instrument on site.
TABLE 1 comparison of measurement accuracy of a large calibration device and a calibration device according to an embodiment of the present invention
To sum up, aiming at the problem that the dc synthetic electric field measurement process in the dc power transmission project lacks an effective calibration device, the calibration device of the portable dc synthetic electric field measurement instrument of the embodiment can conveniently and reliably calibrate the dc synthetic electric field measurement instrument on site, thereby determining the measurement accuracy of the dc synthetic electric field measurement instrument when being used for a long time and transported for many times.
The portable direct-current synthetic electric field measuring instrument calibration device provided by the embodiment of the invention can be carried with a direct-current synthetic electric field measuring instrument, the direct-current synthetic electric field measuring instrument is calibrated on site, the size is small, the weight is light, and the precision of the generated electrostatic field is high, so that the precision of the site calibration is ensured.
The invention has been described above by reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
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 [ device, component, etc ]" are to be interpreted openly as at least one instance of a device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (10)
1. A portable direct current resultant electric field measuring instrument calibrating device is characterized by comprising:
the insulating column, the high-voltage polar plate and the control box are sequentially arranged along the vertical direction from bottom to top;
a ground lead support disposed in a horizontal direction at an interval from the high voltage plate;
a grounding lead wire led out from the inside of the control box;
when the direct current synthetic electric field measuring instrument provided with the cover plate is calibrated, the calibrating device is vertically placed above a probe of the direct current synthetic electric field measuring instrument to be calibrated, and the insulating column is connected with the cover plate;
a moving sheet hole of a probe of the direct current synthetic electric field measuring instrument to be calibrated is aligned with a through hole on the cover plate;
the grounding lead is far away from the control box, spans a first distance along a first horizontal direction, extends to the bottom end of the grounding lead support column along the top end of the grounding lead support column, spans a second distance along a second horizontal direction, and is connected with a shell of the direct current synthetic electric field measuring instrument to be calibrated, wherein the shell is connected with the cover plate at ground potential;
and calibrating the direct current synthetic electric field measuring instrument to be calibrated according to a nominal electrostatic field formed in the space where the high-voltage polar plate is opposite to the cover plate.
2. The calibration device of claim 1, further comprising:
the grounding polar plate is connected with the insulating column and is provided with a calibration hole;
when the direct current synthetic electric field measuring instrument without the cover plate is calibrated, the calibrating device is vertically placed above a probe of the direct current synthetic electric field measuring instrument to be calibrated, and a moving plate hole of the probe of the direct current synthetic electric field measuring instrument to be calibrated is aligned with a calibrating hole of the grounding polar plate;
the grounding lead is far away from the control box, spans a first distance along a first horizontal direction, extends to the bottom end of the grounding lead support column along the top end of the grounding lead support column, spans a second distance along a second horizontal direction, and is connected with a shell of the direct current synthetic electric field measuring instrument to be calibrated, wherein the shell is connected with the grounding polar plate at ground potential;
and calibrating the direct current synthetic electric field measuring instrument to be calibrated according to a nominal electrostatic field formed in the space where the high-voltage polar plate is opposite to the grounding polar plate.
3. Calibration device according to claim 1,
the first distance is not greater than the second distance;
the first distance is not less than 50 cm.
4. Calibration device according to claim 1,
a battery module, a direct-current high-voltage module and a polarity change-over switch which are connected in sequence are arranged in the control box;
the battery module supplies power to the direct-current high-voltage module;
the grounding end of the direct current high-voltage module is connected with a grounding lead in the control box;
the direct-current high-voltage module is further connected with a polarity change-over switch, and the polarity change-over switch is used for connecting the high-voltage pole plate with the positive voltage end or the negative voltage end of the direct-current high-voltage module in a switching mode.
5. Calibration device according to claim 4,
the direct-current high-voltage module comprises a positive voltage module and a negative voltage module;
the grounding end of the positive voltage module and the grounding end of the negative voltage module are respectively connected with the grounding lead wire by ground potential;
the polarity switch connects the positive voltage end of the positive voltage module with the high voltage pole plate, or connects the negative voltage end of the negative voltage module with the high voltage pole plate.
6. Calibration device according to claim 4,
a voltage regulating module and a starting switch are also arranged in the control box;
the battery module is connected with the direct-current high-voltage module through a starting switch;
the direct current high-voltage module is further connected with a voltage regulating module, and the voltage regulating module regulates the output voltage of the high-voltage end of the direct current high-voltage module.
7. Calibration device according to claim 6,
the voltage adjusting module is a manual knob;
the polarity switch is a manual key;
the starting switch is a manual key.
8. Calibration device according to claim 4,
the positive voltage end or the negative voltage end of the direct current high-voltage module is vertically led out from the inside of the control box through a high-voltage lead, penetrates through a bottom plate of the control box and is connected with a high-voltage pole plate;
the grounding lead is led out from the top plate close to the control box so as to ensure that the grounding lead is higher than the high-voltage polar plate in the first horizontal direction.
9. Calibration device according to claim 1 or 2,
the distance between the grounding polar plate and the high-voltage polar plate along the vertical direction is 2-8 cm;
the distance between the grounding polar plate and a cover plate of the direct current synthetic electric field measuring instrument to be calibrated along the vertical direction is 2-8 cm.
10. Calibration device according to claim 1,
the bottom plate of the control box is made of an insulating material, so that the control box is insulated from the high-voltage polar plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010812795.1A CN112230173A (en) | 2020-08-13 | 2020-08-13 | Portable direct current synthetic electric field measuring instrument calibrating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010812795.1A CN112230173A (en) | 2020-08-13 | 2020-08-13 | Portable direct current synthetic electric field measuring instrument calibrating device |
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| CN112230173A true CN112230173A (en) | 2021-01-15 |
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| CN202010812795.1A Pending CN112230173A (en) | 2020-08-13 | 2020-08-13 | Portable direct current synthetic electric field measuring instrument calibrating device |
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| Country | Link |
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| CN (1) | CN112230173A (en) |
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- 2020-08-13 CN CN202010812795.1A patent/CN112230173A/en active Pending
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