CN103135086A - Calibration device and calibration and verification method for direct current electric field measuring apparatus - Google Patents
Calibration device and calibration and verification method for direct current electric field measuring apparatus Download PDFInfo
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Abstract
The invention discloses a calibration device and a calibration and verification method for a direct current electric field measuring apparatus in the technical field of high-pressure gas discharging electromagnetic measurement. The device for the direct current electric field measuring apparatus comprises a corona wire mesh, an electric field upper electrode plate, an electric field lower electrode plate, a bottom support, insulation supporting bars among boards, a first high-voltage direct current generator and a second high-voltage direct current generator, wherein the electric field lower electrode plate is arranged on the bottom support, the electric field upper electrode plate is arranged above the electric field lower electrode plate through the insulation supporting bars among the boards, the corona wire mesh is arranged above the electric field upper electrode plate through the insulation supporting bars among the boards, the first high-voltage direct current generator is connected with the electric field upper electrode plate, the second high-voltage direct current generator is connected with the corona wire mesh, the electric field lower electrode plate is connected with the ground through a ground wire, and a circular hole used for mounting and placing the direct current electric field measuring apparatus is formed in the electric field lower electrode plate. The calibration and verification method for the direct current electric field measuring apparatus achieves the accurate calibration of the direct current electric field measuring apparatus.
Description
Technical field
The invention belongs to high-pressure discharge Techniques in Electromagnetic Measurement field, relate in particular to a kind of caliberating device and demarcation and method of calibration of dc electric field measurement instrument.
Background technology
High voltage dc transmission technology is the important ingredient of intelligent grid.China builds successively and numerous high voltage direct current transmission projects of putting into operation have played vital role to economic development.The electrostatic field of HVDC (High Voltage Direct Current) transmission line under certain voltage is called the nominal electric field.When transmission line of electricity normally moved, the wire field intensity may be greater than the bloom critical field strength, and circuit ambient air molecule is ionized and produces ion, and corona phenomenon namely occurs.The ion of directed movement produces Ion Flow Field.The nominal electric field stack of Ion Flow Field and circuit forms total electric field.At Near Ground, Ion Flow Field meeting appreciable impact nominal electric field makes ground electric field strengthen.The Measurement accuracy total electric field has great significance to research and the evaluation of HVDC (High Voltage Direct Current) transmission line electromagnetic environment.The present invention proposes a kind of caliberating device of dc electric field measurement instrument, and by this device and Wilson's plate, proposed a kind of demarcation and method of calibration of dc electric field measurement instrument.
Summary of the invention
The object of the invention is to, propose a kind of caliberating device and demarcation and method of calibration of dc electric field measurement instrument, be used for realizing the demarcation of dc electric field measurement instrument and the Measurement accuracy of DC power transmission line total electric field.
To achieve these goals, the technical scheme that the present invention proposes is, a kind of caliberating device of dc electric field measurement instrument is characterized in that described device comprises insulating support rod, the first high-voltage D.C. generator and the second high-voltage D.C. generator between corona silk screen, electric field top crown, electric field bottom crown, bottom bracket, plate;
Described electric field bottom crown is placed on bottom bracket;
Described electric field top crown is installed on the electric field bottom crown by insulating support rod between plate;
Described corona wire Netcom crosses that between plate, insulating support rod is installed on the electric field top crown;
Described the first high-voltage D.C. generator is connected with the electric field top crown;
Described the second high-voltage D.C. generator is connected with the corona silk screen;
Described electric field bottom crown passes through ground wire grounded, and the circular hole of laying the dc electric field measurement instrument is arranged on the electric field bottom crown.
Described device comprises upper cover, and described upper cover is installed on the corona silk screen by insulating support rod between plate.
Described device comprises the Wilson's plate that sampling resistor is installed, and described Wilson's plate is placed on the electric field bottom crown, the two ends of described sampling resistor and the electrical connection of Wilson's plate.
A kind of method that caliberating device that uses described dc electric field measurement instrument is demarcated the dc electric field measurement instrument is characterized in that described method comprises:
Step 1: the dc electric field measurement instrument is put into the circular hole of electric field bottom crown, and made the dc electric field measurement instrument concordant with the upper surface of electric field bottom crown;
Step 2: open the first high-voltage D.C. generator, the first high-voltage D.C. generator output voltage produces the nominal electric field between electric field top crown and electric field bottom crown;
Step 3: the output voltage of record the first high-voltage D.C. generator; Use the dc electric field measurement instrument to measure the nominal electric field strength, with the result measured as nominal electric field measurement value;
Step 4: according to formula
Calculate nominal electric field theory value;
E is nominal electric field theory value;
V is the output voltage of the first high-voltage D.C. generator;
D is the distance between electric field top crown and electric field bottom crown;
Step 5: record nominal electric field measurement value and theoretical value, carry out data and process, with result as nominal electric field modified value.
A kind of caliberating device of described dc electric field measurement instrument that uses carries out the method for verification to total electric field, it is characterized in that described method comprises:
Step 1: the dc electric field measurement instrument is put into the circular hole of electric field bottom crown, and made the dc electric field measurement instrument concordant with the upper surface of electric field bottom crown;
Step 2: open the first high-voltage D.C. generator and the second high-voltage D.C. generator, the first high-voltage D.C. generator and the first high-voltage D.C. generator be output voltage respectively, produce the nominal electric field between electric field top crown and electric field bottom crown, the corona silk screen produces ion current;
Step 3: the nominal electric field strength that the output voltage of record the first high-voltage D.C. generator, the output voltage of the second high-voltage D.C. generator and dc electric field measurement instrument are measured;
Step 4: close the first high-voltage D.C. generator and the second high-voltage D.C. generator, take the dc electric field measurement instrument away, place the Wilson's plate that sampling resistor is installed on the electric field bottom crown;
Step 5: open the first high-voltage D.C. generator and the second high-voltage D.C. generator, the output voltage that makes the output voltage of the first high-voltage D.C. generator and the second high-voltage D.C. generator equates with the output voltage of the first high-voltage D.C. generator of step 3 record and the output voltage of the second high-voltage D.C. generator respectively;
Step 6: measure the magnitude of voltage at sampling resistor two ends, and according to formula
Calculate ion current density;
J is ion current density;
U is the magnitude of voltage at resistance two ends;
R is the resistance value of sampling resistor;
S is the area of Wilson's plate;
Step 7: according to formula
Calculate the total electric field field intensity of electric field bottom crown;
E (d) is the total electric field field intensity of electric field bottom crown;
E
0For the electric field strength at electric field top crown place and
V is the output voltage of the first high-voltage D.C. generator;
J is ion current density;
D is the distance between electric field top crown and electric field bottom crown;
ε is dielectric constant of air;
K is ion mobility;
Step 8: calculate the total electric field field intensity at electric field bottom crown place, compare calculating the theoretical value and the measured value that obtain, with the proof test value of data processed result as total electric field.
Parallel electric field pole plate provided by the invention has guaranteed the uniformity coefficient of electric field, has realized the accurate calibration of dc electric field measurement instrument; In addition, the present invention can regulate the size of ion current density, for the research ion current provides technical support to the impact of dc electric field measurement instrument.
Description of drawings
Fig. 1 is the caliberating device structural drawing of dc electric field measurement instrument;
Fig. 2 is the Wilson's plate schematic diagram that sampling resistor is installed;
Fig. 3 is the calibration result schematic diagram of dc electric field measurement instrument;
Fig. 4 is the check results schematic diagram of nominal electric field calibrated dc electric field measurement instrument when being 50kV/m;
Fig. 5 is the check results schematic diagram of nominal electric field calibrated dc electric field measurement instrument when being 60kV/m;
Fig. 6 is the check results schematic diagram of nominal electric field calibrated dc electric field measurement instrument when being 70kV/m.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that, following explanation is only exemplary, rather than in order to limit the scope of the invention and to use.
Fig. 1 is the caliberating device structural drawing of dc electric field measurement instrument.As shown in Figure 1, the caliberating device of dc electric field measurement instrument comprises insulating support rod 6 between corona silk screen 1, electric field top crown 2, electric field bottom crown 3, bottom bracket 5, plate, the first high-voltage D.C. generator 7 and the second high-voltage D.C. generator 8.Electric field bottom crown 3 is placed on bottom bracket 5.Insulating support rod 6 between four jiaos of installing plates of electric field bottom crown 3 upper surfaces, electric field top crown 2 are installed between this plate on insulating support rod 6.Four jiaos of electric field top crown 2 upper surfaces also insulating support rods 6 between installing plate, corona silk screen 1 are installed between the plate of electric field top crown 2 upper surfaces on insulating support rod 6.Do not mark in first high-voltage D.C. generator 7(Fig. 1) be connected with electric field top crown 2, make and produce the nominal electric field between electric field top crown 2 and electric field top crown 3.Do not mark in second high-voltage D.C. generator 8(Fig. 1) be connected with corona silk screen 1, for generation of ion current.
The caliberating device of the dc electric field measurement instrument that enforcement provides can also comprise upper cover 4.As shown in Figure 1, insulating support rod 6 between four jiaos of installing plates of corona silk screen 1 upper surface, upper cover 4 are installed between the plate of corona silk screen 1 upper surface on insulating support rod 6.The effect of upper cover 4 is to stop the ion current that moves upward, and guarantees that ion current moves downward.
Fig. 2 is the Wilson's plate schematic diagram that sampling resistor is installed.As shown in Figure 2, the caliberating device of this dc electric field measurement instrument also comprises the Wilson's plate 11 that sampling resistor 10 is installed.In the present embodiment, the two ends of sampling resistor 10 and 11 electrical connections of Wilson's plate.The Wilson's plate is that area is that 100 square centimeters, thickness are the copper-clad plate of 2 millimeters.Wilson's plate 11 is used for measuring the ion current density of whereabouts, and during use, Wilson's plate 11 is placed on electric field bottom crown 3.
Use the process that the caliberating device of dc electric field measurement instrument provided by the invention is demarcated the dc electric field measurement instrument to be:
Step 1: the dc electric field measurement instrument is put into the circular hole of electric field bottom crown, and made the dc electric field measurement instrument concordant with the upper surface of electric field bottom crown.
Step 2: open the first high-voltage D.C. generator, the output certain voltage produces the nominal electric field between electric field top crown and electric field bottom crown.
Step 3: the output voltage of record the first high-voltage D.C. generator.Meanwhile, use the dc electric field measurement instrument to measure the nominal electric field strength, with the nominal electric field strength of this measurement as nominal electric field measurement value.
Step 4: calculate nominal electric field theory value, its computing formula is as follows:
Wherein, E is nominal electric field theory value, and V is the output voltage of the first high-voltage D.C. generator, and d is the distance between electric field top crown and electric field bottom crown.
Step 5: record nominal electric field measurement value and theoretical value, carry out data and process, with result as nominal electric field modified value.
Fig. 3 is the calibration result schematic diagram of dc electric field measurement instrument.Measurement data when series one data are upper surface flush of dc electric field measurement instrument and electric field bottom crown, serial two data are dc electric field measurement instrument measurement data when being placed directly in the electric field bottom crown.
Use the caliberating device of dc electric field measurement instrument that the process that total electric field carries out verification is comprised:
Step 1: the dc electric field measurement instrument is put into the circular hole of electric field bottom crown, and made the dc electric field measurement instrument concordant with the upper surface of electric field bottom crown.
Step 2: open the first high-voltage D.C. generator and the second high-voltage D.C. generator.After the first high-voltage D.C. generator output voltage, produced the nominal electric field between electric field top crown and electric field bottom crown.The second high-voltage D.C. generator is connected with the corona silk screen, and the corona silk screen produces ion current.If the caliberating device of dc electric field measurement instrument also comprises upper cover, be conducive to ion current directed movement downwards.
Step 3: the nominal electric field strength that the output voltage of record the first high-voltage D.C. generator, the output voltage of the second high-voltage D.C. generator and dc electric field measurement instrument are measured.
Step 4: close the first high-voltage D.C. generator and the second high-voltage D.C. generator, take the dc electric field measurement instrument away, place the Wilson's plate that sampling resistor is installed on the electric field bottom crown.
Step 5: open the first high-voltage D.C. generator and the second high-voltage D.C. generator, the output voltage that makes the output voltage of the first high-voltage D.C. generator and the second high-voltage D.C. generator equates with the output voltage of the first high-voltage D.C. generator of step 3 record and the output voltage of the second high-voltage D.C. generator respectively.
Step 6: measure the magnitude of voltage at sampling resistor two ends, as shown in Figure 2.
Calculate ion current density, its computing formula is as follows:
In formula, J is ion current density, and U is the magnitude of voltage at resistance two ends, and R is the resistance value of sampling resistor, and S is the area of Wilson's plate.
Step 7: calculate electric field bottom crown place total electric field field intensity, computing formula is:
In formula (3), E (d) is electric field bottom crown place total electric field field intensity, E
0For the computing formula of the electric field strength at the electric field strength at electric field top crown place and electric field top crown place is:
In formula (3) and (4), V is the output voltage of the first high-voltage D.C. generator, and J is ion current density, and d is the distance between electric field top crown and electric field bottom crown, and ε is dielectric constant of air, and K is ion mobility.
Step 8: calculate the total electric field field intensity at electric field bottom crown place, compare calculating the theoretical value and the measured value that obtain, with the proof test value of data processed result as total electric field.
Fig. 4, Fig. 5 and Fig. 6 are respectively the nominal electric field when being 50kV/m, 60kV/m and 70kV/m, the check results schematic diagram of calibrated dc electric field measurement instrument.Can find out from Fig. 4, Fig. 5 and Fig. 6, use method of calibration provided by the invention, measured value nearly all is distributed in the both sides of calculated value.
The above; only for the better embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement are within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (5)
1. the caliberating device of a dc electric field measurement instrument, is characterized in that described device comprises insulating support rod, the first high-voltage D.C. generator and the second high-voltage D.C. generator between corona silk screen, electric field top crown, electric field bottom crown, bottom bracket, plate;
Described electric field bottom crown is placed on bottom bracket;
Described electric field top crown is installed on the electric field bottom crown by insulating support rod between plate;
Described corona wire Netcom crosses that between plate, insulating support rod is installed on the electric field top crown;
Described the first high-voltage D.C. generator is connected with the electric field top crown;
Described the second high-voltage D.C. generator is connected with the corona silk screen;
Described electric field bottom crown is by ground wire grounded, and the electric field bottom crown is provided with the circular hole of laying the dc electric field measurement instrument.
2. caliberating device according to claim 1, is characterized in that described caliberating device also comprises upper cover, and described upper cover is installed on the corona silk screen by insulating support rod between plate.
3. caliberating device according to claim 1 and 2, is characterized in that described caliberating device also comprises the Wilson's plate that sampling resistor is installed, and described Wilson's plate is placed on the electric field bottom crown, the two ends of described sampling resistor and the electrical connection of Wilson's plate.
4. method of using caliberating device as claimed in claim 1 or 2 that the dc electric field measurement instrument is demarcated is characterized in that described method comprises:
Step 1: the dc electric field measurement instrument is put into the circular hole of electric field bottom crown, and made the dc electric field measurement instrument concordant with the upper surface of electric field bottom crown;
Step 2: open the first high-voltage D.C. generator, the first high-voltage D.C. generator output voltage produces the nominal electric field between electric field top crown and electric field bottom crown;
Step 3: the output voltage of record the first high-voltage D.C. generator; Use the dc electric field measurement instrument to measure the nominal electric field strength, with the result measured as nominal electric field measurement value;
Step 4: according to formula
Calculate nominal electric field theory value;
E is nominal electric field theory value;
V is the output voltage of the first high-voltage D.C. generator;
D is the distance between electric field top crown and electric field bottom crown;
Step 5: record nominal electric field measurement value and theoretical value, carry out data and process, with result as nominal electric field modified value.
5. one kind is used caliberating device as claimed in claim 3 total electric field to be carried out the method for verification, it is characterized in that described method comprises:
Step 1: the dc electric field measurement instrument is put into the circular hole of electric field bottom crown, and made the dc electric field measurement instrument concordant with the upper surface of electric field bottom crown;
Step 2: open the first high-voltage D.C. generator and the second high-voltage D.C. generator, the first high-voltage D.C. generator and the second high-voltage D.C. generator be output voltage respectively, produce the nominal electric field between electric field top crown and electric field bottom crown, the corona silk screen produces ion current;
Step 3: the nominal electric field strength that the output voltage of record the first high-voltage D.C. generator, the output voltage of the second high-voltage D.C. generator and dc electric field measurement instrument are measured;
Step 4: close the first high-voltage D.C. generator and the second high-voltage D.C. generator, take the dc electric field measurement instrument away, place the Wilson's plate that sampling resistor is installed on the electric field bottom crown;
Step 5: open the first high-voltage D.C. generator and the second high-voltage D.C. generator, the output voltage that makes the output voltage of the first high-voltage D.C. generator and the second high-voltage D.C. generator equates with the output voltage of the first high-voltage D.C. generator of step 3 record and the output voltage of the second high-voltage D.C. generator respectively;
Step 6: measure the magnitude of voltage at sampling resistor two ends, and according to formula
Calculate ion current density;
J is ion current density;
U is the magnitude of voltage at resistance two ends;
R is the resistance value of sampling resistor;
S is the area of Wilson's plate;
Step 7: according to formula
Calculate the total electric field field intensity of electric field bottom crown;
E (d) is the total electric field field intensity of electric field bottom crown;
E
0For the electric field strength at electric field top crown place and
V is the output voltage of the first high-voltage D.C. generator;
J is ion current density;
D is the distance between electric field top crown and electric field bottom crown;
ε is dielectric constant of air;
K is ion mobility;
Step 8: calculate the total electric field field intensity at electric field bottom crown place, compare calculating the theoretical value and the measured value that obtain, with the proof test value of data processed result as total electric field.
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| CN108267704A (en) * | 2018-04-10 | 2018-07-10 | 南京信息工程大学 | Atmospheric electric field detector calibrating platform |
| CN109188113A (en) * | 2018-10-18 | 2019-01-11 | 华北电力大学 | The device and method of simulated environment test is carried out for simulating uniform ion flow field |
| CN109298364A (en) * | 2018-11-01 | 2019-02-01 | 北京东方计量测试研究所 | A kind of improved static electric field instrument calibration system and method |
| CN109298364B (en) * | 2018-11-01 | 2021-03-19 | 北京东方计量测试研究所 | Improved electrostatic field instrument calibration system and method |
| CN112305327A (en) * | 2020-09-25 | 2021-02-02 | 中国电力科学研究院有限公司 | Field grinding type airspace electric field sensor device and electric field measuring method |
| CN112305327B (en) * | 2020-09-25 | 2023-01-31 | 中国电力科学研究院有限公司 | Field grinding type airspace electric field sensor device and electric field measuring method |
| CN117289040A (en) * | 2023-11-27 | 2023-12-26 | 中国科学院空天信息创新研究院 | Three-dimensional direct current electric field detection device and detection method |
| CN117289040B (en) * | 2023-11-27 | 2024-02-23 | 中国科学院空天信息创新研究院 | Three-dimensional direct current electric field detection device and detection method |
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