CN112904253B - Electronic measuring device with temperature self-calibration function - Google Patents

Electronic measuring device with temperature self-calibration function Download PDF

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Publication number
CN112904253B
CN112904253B CN202110053972.7A CN202110053972A CN112904253B CN 112904253 B CN112904253 B CN 112904253B CN 202110053972 A CN202110053972 A CN 202110053972A CN 112904253 B CN112904253 B CN 112904253B
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voltage
measuring
measuring resistor
switch
resistor
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CN112904253A (en
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卢斌先
薛涛
张�杰
马勇飞
刘生春
王献敏
王华彪
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North China Electric Power University
State Grid Qinghai Electric Power Co Ltd
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North China Electric Power University
State Grid Qinghai Electric Power Co Ltd
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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 an electronic measuring device with temperature self-calibration, which comprises: the device comprises a GIS metal shell, a high-voltage conductor and M voltage measuring units, wherein M is a positive integer greater than or equal to 1; each voltage measuring unit comprises a metal sensing sheet, a first switch, a second switch, a first measuring resistor, a second measuring resistor, a voltage measuring module and a voltage display; the voltage measuring module is used for measuring the voltage at two ends of the first measuring resistor and the voltage at two ends of the second measuring resistor; the voltage display is used for calculating the final voltage of the high-voltage conductor according to the voltage at the two ends of the first measuring resistor and the voltage at the two ends of the second measuring resistor by adopting a temperature self-calibration method, displaying the final voltage, and comprehensively considering the influence of temperature on the resistance value of the measuring resistor, so that the accuracy of measuring the voltage of the high-voltage conductor is improved.

Description

Electronic measuring device with temperature self-calibration function
Technical Field
The invention relates to the technical field of partial discharge monitoring, in particular to an electronic measuring device with temperature self-calibration function.
Background
Electric energy is the national economic life pulse and is closely related to the daily life of people. In recent years, the power industry in China is rapidly developing, and the voltage level is continuously improved. A totally enclosed Gas Insulated Substation (GIS) uses sulfur hexafluoride (SF6) Gas with high insulation and arc extinguishing performance as an insulation and arc extinguishing medium, so that the application of the Gas Insulated substation in an electric power system is more and more extensive. The accurate measurement of the voltage level of the high-voltage conductor inside the GIS becomes particularly important, and because the traditional sensor is complex to use and expensive, the high-precision and low-cost voltage measurement method is greatly meaningful in practical engineering.
And a teaching is previously taught, and a method and a device for measuring the power frequency voltage of the independent overhead line, which are proposed before zhuan' an and lihaiming, are connected with the overhead line in a parallel connection mode, and a metal sensing sheet is located at a low potential.
Disclosure of Invention
Based on the above, the invention aims to provide an electronic measuring device with temperature self-calibration, so as to accurately measure the voltage of a high-voltage conductor in a GIS.
In order to achieve the above object, the present invention provides an electronic measuring device with temperature self-calibration, comprising:
the device comprises a GIS metal shell, a high-voltage conductor and M voltage measuring units, wherein M is a positive integer greater than or equal to 1; each voltage measuring unit comprises a metal sensing sheet, a first switch, a second switch, a first measuring resistor, a second measuring resistor, a voltage measuring module and a voltage display; the GIS metal shell is connected with the ground, one end of the first measuring resistor and one end of the second measuring resistor are both connected with the metal sensing sheet, the other end of the first measuring resistor is connected with one end of the first switch, the other end of the second measuring resistor is connected with one end of the second switch, the other end of the first switch and the other end of the second switch are both connected with the GIS residual part, and the pressure measuring module is respectively connected with one end of the first measuring resistor, the other end of the first switch and the voltage display;
the GIS metal shell is used for containing a high-voltage conductor;
cutting the metal sensing sheet from the GIS metal shell, and putting the cut metal sensing sheet back to the original cutting position of the GIS metal shell; a gap between the metal sensing piece and the rest part of the GIS is filled with an insulating material; the GIS metal shell is provided with a GIS metal shell, and the GIS metal shell is provided with a metal sensing piece;
the voltage measuring module is used for measuring the voltage at two ends of the first measuring resistor and the voltage at two ends of the second measuring resistor;
the voltage display is used for calculating the final voltage of the high-voltage conductor according to the voltage at the two ends of the first measuring resistor and the voltage at the two ends of the second measuring resistor by adopting a temperature self-calibration method, and displaying the final voltage.
Optionally, the voltage display is configured to calculate the voltage of the high-voltage conductor according to the voltage across the first measurement resistor and the voltage across the second measurement resistor by using a temperature self-calibration method, and specifically includes:
calculating the first capacitance C by finite element method1And a second capacitor C2(ii) a The first capacitor C1The part of capacitance between the high-voltage conductor and the metal sensing sheet is used as the capacitance; the second capacitor C2The capacitance of the metal sensing piece is part of capacitance in an insulation gap between the metal sensing piece and the rest part of the GIS;
the first switch is closed, the second switch is opened, and the voltage U at two ends of the first measuring resistor is measured by the voltage measuring module1Then the second switch is closed, the first switch is opened, and the voltage U at two ends of the second measuring resistor is measured by the voltage measuring module2；
Let the initial value R of the first measuring resistance 1 (0)1 M.OMEGA.using the measured U1、C1、C2And R1 (0)Calculating the initial high-voltage conductor voltage E(0)；
By using E(0)、U2、C1And C2Calculating an initial value R of the second measuring resistor2 (0)Then, according to the temperature curve corresponding to the second measuring resistor, finding out R2 (0)Corresponding temperature T(0)；
Finding T according to the temperature curve corresponding to the first measuring resistor(0)Corresponding resistance value R1 (1)By means of U1、C1、C2And R1 (1)Calculating the high-voltage conductor voltage E of the first iteration(1)；
By using E(1)、U2、C1And C2Calculating the resistance value R of the first iteration of the second measuring resistor2 (1)Then, according to the temperature curve corresponding to the second measuring resistor, finding out R2 (1)Corresponding temperature T(1)；
Continuously iterating until | R1 (k+1)-R1 (k)|<If theta is a set real number, the requirement of precision is considered to be met, the iteration is stopped, and the high-voltage conductor voltage E of the k-th iteration is determined(k)As the final voltage.
Optionally, said first capacitance C is calculated "using a finite element method1And said second capacitance C2Before, the method also comprises the following steps:
constructing an equivalent circuit model; the equivalent circuit model includes: the device comprises a first switch, a second switch, a first measuring resistor, a second measuring resistor, a first capacitor, a second capacitor and a voltage source; the one end ground connection of voltage source, the other end of voltage source with the other end of first electric capacity is connected, the one end of first electric capacity all with the other end of second electric capacity the other end of first switch with the other end of second switch is connected, the one end of first switch with the other end of first measuring resistance is connected, the one end of second switch with the other end of second measuring resistance is connected, the one end of second electric capacity the one end of first measuring resistance with the one end of second measuring resistance all grounds.
Optionally, the insulating material is a polyimide film or an epoxy resin.
Optionally, the metal sensing piece is a circular metal sensing piece.
Optionally, the electronic measuring device further comprises:
and the cable is used for connecting the pressure measuring module and the voltage display.
Optionally, the second measurement resistance is a temperature sensitive measurement resistance.
Optionally, the first measuring resistor is 1M ohm, and the value range of the second measuring resistor is 1 k-3M ohm.
Optionally, the temperature curve corresponding to the first measuring resistor and the temperature curve corresponding to the second measuring resistor are both given by a factory when the factory leaves a factory.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the electronic measuring device with the temperature self-calibration function disclosed by the invention adopts a temperature self-calibration method, calculates the final voltage of the high-voltage conductor according to the voltage at the two ends of the first measuring resistor and the voltage at the two ends of the second measuring resistor, and comprehensively considers the influence of the temperature on the resistance value of the measuring resistor, thereby improving the accuracy of measuring the voltage of the high-voltage conductor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a view showing a structure of a measuring apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an equivalent circuit model according to an embodiment of the present invention;
FIG. 3 is a flow chart of calculating the final voltage of the high voltage conductor using a temperature self-calibration method according to an embodiment of the present invention;
the device comprises a pressure measuring module 1, a first measuring resistor 2, a second measuring resistor 3, an insulating material 4, a GIS metal shell 5, a metal sensing piece 6, a high-voltage conductor 7, a first switch 8, a voltage display 9, a cable 10 and a second switch 11.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an electronic measuring device with temperature self-calibration function, so as to accurately measure the voltage of a high-voltage conductor in a GIS.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the present invention provides an electronic measuring device with temperature self-calibration, comprising:
the device comprises a GIS metal shell 5, a high-voltage conductor 7 and M voltage measuring units, wherein M is a positive integer greater than or equal to 1; each voltage measuring unit comprises a metal sensing sheet, a first switch 8, a second switch 11, a first measuring resistor 2, a second measuring resistor 3, a voltage measuring module 1 and a voltage display 9; the GIS metal casing 5 is connected with the ground, one end of the first measuring resistor 2 and one end of the second measuring resistor 3 are connected with the metal sensing sheet, the other end of the first measuring resistor 2 is connected with one end of the first switch 8, the other end of the second measuring resistor 3 is connected with one end of the second switch 11, the other end of the first switch 8 and the other end of the second switch 11 are connected with the GIS residual part, and the pressure measuring module 1 is respectively connected with one end of the first measuring resistor 2, the other end of the first switch 8 and the voltage display 9.
The GIS metal shell 5 is used for containing a high-voltage conductor 7; cutting the metal sensing piece from the GIS metal shell 5, and putting the cut metal sensing piece back to the original cutting position of the GIS metal shell 5; the gap between the metal sensing piece and the rest part of the GIS is filled with an insulating material 4; the GIS residual part is the part left on the GIS metal shell 5 after the metal sensing piece is cut off; the voltage measuring module 1 is used for measuring the voltage at two ends of the first measuring resistor 2 and the voltage at two ends of the second measuring resistor 3; the voltage display 9 is configured to calculate a final voltage of the high-voltage conductor 7 according to the voltage across the first measuring resistor 2 and the voltage across the second measuring resistor 3 by using a temperature self-calibration method, and display the final voltage.
As an embodiment, the electronic measuring device of the present invention further includes: and the cable 10 is used for connecting the voltage measuring module 1 and the voltage display 9.
In the above embodiment, the insulating material 4 is a polyimide film or an epoxy resin; the insulating material 4 is used for realizing the insulation of the GIS metal shell and the metal sensing piece; the metal sensing piece is a round metal sensing piece; the first measuring resistor 2 is a common measuring resistor, and the second measuring resistor 3 is a temperature-sensitive measuring resistor; the first measuring resistor 2 is 1M ohm, and the value range of the second measuring resistor 3 is 1 k-3M ohm.
As shown in fig. 3, the voltage display 9 of the present invention is configured to calculate the voltage of the high-voltage conductor 7 according to the voltage across the first measuring resistor 2 and the voltage across the second measuring resistor 3 by using a temperature self-calibration method, and specifically includes:
calculating the first capacitance C by finite element method1And a second capacitor C2. The first capacitor C1The part of capacitance between the high-voltage conductor and the metal sensing sheet is used as the capacitance; the second capacitor C2And the capacitance is part of capacitance in an insulation gap between the metal sensing piece and the rest part of the GIS.
Closing the first switch k1Opening the second switch k2Measuring the first measuring resistance R by using the pressure measuring module1Voltage U across1Then closing the second switch k2Opening the first switch k1And measuring the second measuring resistor R by using the pressure measuring module2Voltage U across2。
Let the first measuring resistance R1Initial value R of1 (0)1 M.OMEGA.using the measured U1、C1、C2And R1 (0)Calculating the initial high-voltage conductor voltage E(0)。
By using E(0)、U2、C1And C2Calculating the second measurement resistance R2Initial value R of2 (0)And then according to said second measuring resistance R2Finding R from the corresponding temperature curve2 (0)Corresponding temperature T(0)。
According to the first measuring resistance R1Corresponding temperature curve is found to be T(0)Corresponding resistance value R1 (1)By means of U1、C1、C2And R1 (1)Calculating the high-voltage conductor voltage E of the first iteration(1)。
By using E(1)、U2、C1And C2Calculating the second measurement resistance R2Resistance value R of the first iteration2 (1)And then according to said second measuring resistance R2Finding R from the corresponding temperature curve2 (1)Corresponding temperature T(1)。
Continuously iterating until | R1 (k+1)-R1 (k)|<If theta is a set real number, the requirement of precision is considered to be met, the iteration is stopped, and the high-voltage conductor voltage E of the k-th iteration is determined(k)As the final voltage output by the voltage source E. In this embodiment, the temperature curve corresponding to the first measuring resistor R1 and the temperature curve corresponding to the second measuring resistor R2 are both specified by manufacturers at the time of factory shipment.
In "calculating said first capacitance C by using finite element method1And said second capacitance C2"also include before: constructing an equivalent circuit model; as shown in fig. 2, the equivalent circuit model includes: first switch k1A second switch k2A first measuring resistor R1A second measuring resistor R2A first capacitor C1A second capacitor C2And a voltage source E; one of the voltage sources EThe end is grounded, and the other end of the voltage source E is connected with the first capacitor C1Is connected to the other end of the first capacitor C1One end of each of the first and second capacitors C2Another terminal of (b), the first switch k1And the other end of the second switch k2Is connected to the other end of the first switch k1And the first measuring resistor R1Is connected to the other end of the second switch k2And the second measuring resistor R2Is connected to the other end of the first capacitor C, the second capacitor C2One end of, the first measuring resistance R1And the second measuring resistance R2Are all grounded.
In this embodiment, the high-voltage conductor is a metal conductor through which high voltage passes, and the inside of the GIS metal housing is of a hollow cylindrical structure and is used for being filled with sulfur hexafluoride gas; the first switch 8 and the second switch 11 are both remote control switches.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist in understanding the core concepts of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (8)

1. An electronic measuring device with self-calibration of temperature, characterized in that it comprises:
the device comprises a GIS metal shell, a high-voltage conductor and M voltage measuring units, wherein M is a positive integer greater than or equal to 1; each voltage measuring unit comprises a metal sensing sheet, a first switch, a second switch, a first measuring resistor, a second measuring resistor, a voltage measuring module and a voltage display; the GIS metal shell is connected with the ground, one end of the first measuring resistor and one end of the second measuring resistor are both connected with the metal sensing sheet, the other end of the first measuring resistor is connected with one end of the first switch, the other end of the second measuring resistor is connected with one end of the second switch, the other end of the first switch and the other end of the second switch are both connected with the GIS residual part, and the pressure measuring module is respectively connected with one end of the first measuring resistor, the other end of the first switch and the voltage display;
the GIS metal shell is used for containing a high-voltage conductor;
cutting the metal sensing sheet from the GIS metal shell, and putting the cut metal sensing sheet back to the original cutting position of the GIS metal shell; a gap between the metal sensing piece and the rest part of the GIS is filled with an insulating material; the GIS metal shell is provided with a GIS metal shell, and the GIS metal shell is provided with a metal sensing piece;
the voltage measuring module is used for measuring the voltage at two ends of the first measuring resistor and the voltage at two ends of the second measuring resistor;
the voltage display is used for calculating the final voltage of the high-voltage conductor according to the voltage at the two ends of the first measuring resistor and the voltage at the two ends of the second measuring resistor by adopting a temperature self-calibration method and displaying the final voltage;
the voltage display is used for calculating the voltage of the high-voltage conductor according to the voltage at two ends of the first measuring resistor and the voltage at two ends of the second measuring resistor by adopting a temperature self-calibration method, and specifically comprises the following steps:
calculating the first capacitance C by finite element method1And a second capacitor C2(ii) a The first capacitor C1The part of capacitance between the high-voltage conductor and the metal sensing sheet is used as the capacitance; the second capacitor C2The capacitance of the metal sensing piece is part of capacitance in an insulation gap between the metal sensing piece and the rest part of the GIS;
the first switch is closed, the second switch is opened, and the voltage at two ends of the first measuring resistor is measured by the voltage measuring moduleU1Then the second switch is closed, the first switch is opened, and the voltage U at two ends of the second measuring resistor is measured by the voltage measuring module2；
Let the initial value R of the first measuring resistance1 (0)1 M.OMEGA.using the measured U1、C1、C2And R1 (0)Calculating the initial high-voltage conductor voltage E(0)；
By using E(0)、U2、C1And C2Calculating an initial value R of the second measuring resistor2 (0)Then, according to the temperature curve corresponding to the second measuring resistor, finding out R2 (0)Corresponding temperature T(0)；
Finding T according to the temperature curve corresponding to the first measuring resistor(0)Corresponding resistance value R1 (1)By means of U1、C1、C2And R1 (1)Calculating the high-voltage conductor voltage E of the first iteration(1)；
By using E(1)、U2、C1And C2Calculating the resistance value R of the first iteration of the second measuring resistor2 (1)Then, according to the temperature curve corresponding to the second measuring resistor, finding out R2 (1)Corresponding temperature T(1)；
Continuously iterating until | R1 (k+1)-R1 (k)|<If theta is a set real number, the requirement of precision is considered to be met, the iteration is stopped, and the high-voltage conductor voltage E of the k-th iteration is determined(k)As the final voltage.
2. The electronic measurement device with self-calibration according to claim 1, wherein the first capacitance C is calculated "by finite element method1And said second capacitance C2Before, the method also comprises the following steps:
constructing an equivalent circuit model; the equivalent circuit model includes: the device comprises a first switch, a second switch, a first measuring resistor, a second measuring resistor, a first capacitor, a second capacitor and a voltage source; the one end ground connection of voltage source, the other end of voltage source with the other end of first electric capacity is connected, the one end of first electric capacity all with the other end of second electric capacity the other end of first switch with the other end of second switch is connected, the one end of first switch with the other end of first measuring resistance is connected, the one end of second switch with the other end of second measuring resistance is connected, the one end of second electric capacity the one end of first measuring resistance with the one end of second measuring resistance all grounds.
3. The electronic measurement device with temperature self-calibration according to claim 1, wherein the insulating material is a polyimide film or an epoxy resin.
4. The electronic measuring device with self-calibration of temperature according to claim 1, wherein the metal sensor plate is a circular metal sensor plate.
5. The electronic measuring device with self-calibration of temperature according to claim 1, further comprising:
and the cable is used for connecting the pressure measuring module and the voltage display.
6. The electronic measuring device with self-calibration according to claim 1, wherein the second measuring resistor is a temperature-sensitive measuring resistor.
7. The electronic measuring device with temperature self-calibration function according to claim 1, wherein the first measuring resistor is 1M ohm, and the second measuring resistor has a value ranging from 1k to 3M ohm.
8. The electronic measuring device with self-calibration according to claim 1, wherein the temperature curve corresponding to the first measuring resistor and the temperature curve corresponding to the second measuring resistor are factory-specified.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101788603A (en) * 2010-03-08 2010-07-28 华北电力大学 VFTO measuring system
CN202330685U (en) * 2011-11-16 2012-07-11 贵州航天计量测试技术研究所 Device for calibrating electromotive force value of standard battery
CN107407711A (en) * 2015-02-04 2017-11-28 法国大陆汽车公司 For optimizing the method for wetting current and the equipment for being used to monitor the sensor with contact-making switch of adaptation

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012117912A (en) * 2010-11-30 2012-06-21 Toshiba Corp Power supply voltage detection circuit
GB201309825D0 (en) * 2013-06-01 2013-07-17 Metroic Ltd Current measurement
WO2016150872A1 (en) * 2015-03-20 2016-09-29 Abb Technology Ag High-voltage measuring unit with self-correction
CN105092927B (en) * 2015-09-11 2018-07-03 广东电网有限责任公司电力科学研究院 A kind of self-calibration high-precision alternating current-direct current divider
EP3185020A1 (en) * 2015-12-22 2017-06-28 Siemens Aktiengesellschaft Method and device for measuring current
US10761120B2 (en) * 2017-02-17 2020-09-01 Allegro Microsystems, Llc Current sensor system
CN106885934B (en) * 2017-03-09 2019-10-01 华北电力大学 A kind of bus voltage measurement device established in three-phase integrated GIS tank body closed end
CN107064600B (en) * 2017-03-09 2019-08-23 华北电力大学 A kind of GIS bus voltage measurement device established in low-pressure tank body side surface
CN106896302A (en) * 2017-03-23 2017-06-27 华北电力大学 GIS device low-voltage conductor surface field strength meter and method
CN206725126U (en) * 2017-04-15 2017-12-08 深圳市容亮电子有限公司 Electrical parameter measuring device with self-checking function
CN107728094B (en) * 2017-10-23 2020-09-29 宁德时代新能源科技股份有限公司 Current calibration coefficient measuring device and method, and current detecting device and method
CN108680888A (en) * 2018-06-11 2018-10-19 中国电力科学研究院有限公司 The method and system of all-fiber current transformator accuracy under a kind of low temperature disconnection fault
CN110673073B (en) * 2018-07-02 2024-04-12 广东电网有限责任公司 Partial discharge signal simulation device with temperature measurement circuit
CN111190086A (en) * 2020-03-11 2020-05-22 华北电力大学 GIS partial discharge on-line monitoring device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101788603A (en) * 2010-03-08 2010-07-28 华北电力大学 VFTO measuring system
CN202330685U (en) * 2011-11-16 2012-07-11 贵州航天计量测试技术研究所 Device for calibrating electromotive force value of standard battery
CN107407711A (en) * 2015-02-04 2017-11-28 法国大陆汽车公司 For optimizing the method for wetting current and the equipment for being used to monitor the sensor with contact-making switch of adaptation

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