CN115792776A - Remote calibration system and method for alternating current voltage source - Google Patents
Remote calibration system and method for alternating current voltage source Download PDFInfo
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Abstract
The invention relates to a remote calibration system and a remote calibration method for an alternating current voltage source, wherein the system comprises two time interval counters, one end of a first time interval counter is connected with one end of a laboratory computer, and the other end of the laboratory computer, a three-phase standard source and a first voltage frequency conversion module are sequentially connected with the other end of the first time interval counter; one end of the second time interval counter is connected with one end of the calibration site computer, and the other end of the calibration site computer, the alternating current voltage source to be calibrated, the second voltage frequency conversion module and the other end of the second time interval counter are sequentially connected. The method can solve the problem that the additional error is difficult to measure, ensure the accuracy and reliability of the metering data, improve the calibration efficiency and convenience, shorten the time for transmitting the alternating current voltage source from about 20 days to 1 day, save a large amount of manpower and material resources, and meet the use requirements of operators on the alternating current voltage source.
Description
Technical Field
The invention relates to the field of remote calibration, in particular to remote calibration of an alternating current voltage source, and particularly relates to a system and a method for remote calibration of the alternating current voltage source.
Background
The alternating current voltage source is widely applied to power production, is frequently used, and is one of necessary devices of power enterprises. According to traditional magnitude transmission and the mode of tracing to the source, the electric power enterprise need send alternating voltage source measurement technical mechanism to calibrate, takes back after the calibration finishes, needs a large amount of human costs, and equipment user personnel need wait for longer time, not be biased to on-the-spot production. Particularly, in an epidemic situation, personnel flow inconveniently, so that a large number of alternating current voltage sources are difficult to calibrate regularly, and the field operation quality is difficult to guarantee.
Disclosure of Invention
Therefore, the invention provides a system and a method for remotely calibrating an alternating current voltage source to solve the problems, efficiently calibrate the alternating current voltage source, ensure the accuracy and reliability of the measurement data in the calibration process, avoid the problem of the failure detection of the alternating current voltage source caused by too long time of the alternating current voltage source in the calibration process or untimely calibration in a laboratory and the like, and simultaneously meet the use requirements of operators on the alternating current voltage source.
The technical scheme adopted by the invention is as follows:
the system comprises two time interval counters, wherein one end of a first time interval counter is connected with one end of a laboratory computer, and the other end of the laboratory computer, a three-phase standard source and a first voltage frequency conversion module are sequentially connected with the other end of the first time interval counter;
one end of the second time interval counter is connected with one end of the calibration site computer, and the other end of the calibration site computer, the alternating current voltage source and the second voltage frequency conversion module are sequentially connected with the other end of the second time interval counter;
the voltage-frequency conversion module converts the standard and detected voltage parameters into pulse signals with corresponding frequencies, the pulse signals are used as door closing pulses of a time interval counter, second pulses synchronized by a GPS satellite receiver are used as door opening pulses of the time interval counter, and time difference values of the GPS satellite pulses and local pulses are measured at two ends of the time interval counter respectively;
the laboratory computer judges whether the alternating voltage source to be calibrated meets the technical index requirements or not according to the test data, and when the alternating voltage source to be calibrated does not meet the technical index requirements, the alternating voltage source to be calibrated is automatically calibrated;
the laboratory computer collects the values of the two time interval counters, the time difference between the local pulse signals at the two ends is obtained by subtracting the two time difference values, namely the time difference between the standard voltage source and the voltage source to be corrected, the frequency difference corresponding to the two ends can be obtained through the corresponding relation between the time deviation and the frequency deviation, the voltage difference at the two ends is obtained, and the remote calibration of the alternating current voltage source is completed.
Furthermore, the laboratory computer comprises a control module, a configuration information management module, a measurement state display module and a report generation module which are connected with the control module; wherein:
the configuration information management module completes task allocation and man-machine interaction of the system, and realizes recording of information such as standard sources and the models of the calibrated instruments and selection of calibration report storage paths;
the measurement state display module displays the measurement point, the measurement progress and the measurement time difference data in real time;
and the report generation module generates a calibration report according to the designed AC voltage source calibration report template.
Further, the control module controls the calibration process, implements the whole calibration process according to the set calibration process, and stores the real-time difference data to the designated position of the computer; during data processing, software carries out data analysis processing based on a designed algorithm, and the average value of 10 repeated measurement data of each measurement point of a voltage source to be corrected is taken as a measurement result V X Uncertainty is given by a GUM evaluation method, and the display value of a three-phase standard source is V N According to the formula Δ = V X -V N And obtaining the indication error of the corrected alternating current voltage source. And when the laboratory computer judges that the calibrated voltage source does not meet the technical index requirements according to the measurement data, the automatic calibration software of the calibration site computer is started to finish the automatic calibration of the calibrated voltage source.
Further, the ac voltage source is automatically calibrated remotely as follows:
full scale calibration of an alternating current voltage source:
the method for solving the linear function by adopting two points comprises the following steps:
Y＝k0*X+b0 (1)
BY＝k1*X+b1 (2)
y is the current display value, k0 and b0 are the current coefficients, the corresponding coefficients can be obtained from the memory of the device after authorization is passed, and BY is the standard value.
(1) From the device display values, the current X can be calculated.
(2) And reading a standard value BY1 when the fullness is measured, adjusting to any equipment state point to obtain a standard value BY2, and respectively calculating to obtain X1 and X2 according to the current display value and k0 and b 0. Then Y1= k1 × X1+ b1, Y2= k1 × X2+ b1, and k1= (BY 1-BY 2)/(X1-X2) is obtained from BY1= k1 × X1+ b1 and BY2= k1 × X2+ b1, that is, new calibration coefficients k1 and b1 are obtained, and the calculated values are written into the device BY a command, and meanwhile, in order to ensure that the measured values of the device are closer to the true values, we can adopt a multiple averaging method to optimize the k and b coefficients.
Further, the remote automatic calibration of the ac voltage source further comprises:
zero calibration of an alternating voltage source:
(1) After the device is linearly calibrated to full scale, the zero point needs to be calibrated, the loop is disconnected, and the zero point average value zero1 recorded in a period of time is adopted.
(2) Calculating a linearity formula zero2= k 0X + b0+ zero0 (zero 0 is an initial zero point) according to a formula by commanding to continuously read zero values for a period of time to obtain zero2; zero2 and zero1 yield Δ zero; then zeroN =Δzero-zero0 can be obtained from zero1= k 0X + b0+ zero0+ Δ zero, and finally the value of zeroN is written to the device by a command.
Further, the correspondence relationship model of the time deviation and the frequency deviation is as follows:
wherein, Δ f is the frequency deviation between the two ends, i.e. the frequency value of the AC voltage source end to be detected minus the frequency value of the standard source end, f A In order to calibrate the frequency at the laboratory end,
is the relative frequency deviation of the two ends, delta t is the time deviation of the two ends, namely the time difference of the source end of the alternating voltage to be treated is subtracted from the time difference of the standard source end, t A In order to calibrate the time at the laboratory end,
k and b are two constant parameters which are relative time deviations of two ends.
The invention also relates to a remote calibration method of the alternating current voltage source, which comprises the following steps:
firstly, selecting a high-precision voltage-frequency conversion module, converting standard and detected voltage parameters into pulse signals with corresponding frequencies by using the voltage-frequency conversion module, taking the pulse signals as door closing pulses of a time interval counter, taking second pulses synchronized by a GPS satellite receiver as door opening pulses of the time interval counter, and respectively measuring time difference values of the GPS satellite pulses and local pulses at two ends;
and secondly, transmitting the detected data to a metering standard laboratory end through the Internet, and subtracting the two time difference values to obtain the time difference between the local pulse signals at the two ends, namely the time difference between the standard voltage source and the voltage source to be calibrated. And obtaining the frequency difference corresponding to the two ends through the corresponding relation between the time deviation and the frequency deviation, namely obtaining the voltage difference of the two ends, and finishing the remote calibration process of the alternating voltage source.
The rapid development of internet and internet of things technology makes it possible to implement remote calibration of field devices.
Currently, there are three main ways for implementing remote quantity value transmission and tracing:
firstly, a mode of transferring a standard table is adopted for field calibration;
secondly, the standard table is placed on the site;
and thirdly, the measuring standard device remotely calibrates the field instrument in a laboratory through the Internet. The remote quantity value transmission and traceability method for the research metering instrument is characterized in that an alternating current voltage source remote quantity value transmission and traceability system is established by utilizing the internet and the internet of things technology, the problem that additional errors are difficult to measure is solved, the accuracy and reliability of metering data are guaranteed, the calibration efficiency and convenience can be improved, and a large amount of manpower and material resources are saved. Meanwhile, the remote calibration can realize 'flattening' metering, and reduce errors caused by step-by-step quantity transmission in the traditional mode.
The invention establishes the remote quantity value transmission and traceability system of the alternating current voltage source by utilizing the Internet and the Internet of things technology, not only can solve the problem that additional errors are difficult to measure, ensure the accuracy and reliability of measurement data, but also can improve the calibration efficiency and the convenience, shorten the calibration time of the alternating current voltage source from about 20 days to 1 day, save a large amount of manpower and material resources, and simultaneously meet the use requirements of operating personnel on the alternating current voltage source.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention connected to a laboratory computer and a calibration site computer;
FIG. 2 is a system block diagram of an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a virtual private network according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments without making any creative efforts shall fall within the protection scope of the present application.
Unless otherwise defined, technical or scientific terms used in the embodiments of the present application should have the ordinary meaning as understood by those having ordinary skill in the art. The use of "first," "second," and similar terms in the present embodiments does not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but does not exclude other elements or items. "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. "Upper," "lower," "left," "right," "lateral," "vertical," and the like are used solely in relation to the orientation of the components in the figures, and these directional terms are relative terms that are used for descriptive and clarity purposes and that can vary accordingly depending on the orientation in which the components in the figures are placed.
As shown in fig. 1, the ac voltage source remote calibration system of this embodiment includes two time interval counters, a configuration information management module, a measurement status display module, and a report generation module.
One end of the first time interval counter is connected with one end of a laboratory computer, and the other end of the laboratory computer, the three-phase standard source, the first voltage frequency conversion module and the other end of the first time interval counter are sequentially connected.
One end of the second time interval counter is connected with one end of the calibration site computer, and the other end of the calibration site computer, the calibrated alternating current voltage source, the second voltage frequency conversion module and the other end of the second time interval counter are sequentially connected.
The voltage-frequency conversion module converts the standard and detected voltage parameters into pulse signals with corresponding frequencies, the pulse signals are used as door closing pulses of a time interval counter, second pulses synchronized by a GPS satellite receiver are used as door opening pulses of the time interval counter, and time difference values of the GPS satellite pulses and local pulses are measured at two ends of the time interval counter respectively.
And the laboratory computer judges whether the alternating current voltage source to be calibrated meets the technical index requirements or not according to the test data, and automatically calibrates the alternating current voltage source to be calibrated when the alternating current voltage source to be calibrated does not meet the technical index requirements.
The laboratory computer collects the values of the two time interval counters, the time difference between the local pulse signals at the two ends is obtained by subtracting the two time difference values, namely the time difference between the standard voltage source and the voltage source to be corrected, the frequency difference corresponding to the two ends can be obtained through the corresponding relation between the time deviation and the frequency deviation, the voltage difference at the two ends is obtained, and the remote calibration of the direct-current voltage source is completed.
The laboratory computer comprises a control module, a configuration information management module, a measurement state display module and a report generation module, wherein the configuration information management module, the measurement state display module and the report generation module are connected with the control module; wherein:
the configuration information management module completes task allocation and man-machine interaction of the system, and realizes recording of information such as standard sources and the models of the calibrated instruments and selection of calibration report storage paths;
the measurement state display module displays the measurement point, the measurement progress and the measurement time difference data in real time;
and the report generation module generates a calibration report according to the designed AC voltage source calibration report template.
The control module controls the calibration process, implements the whole calibration process according to the set calibration process, and stores the real-time difference data to the designated position of the computer; during data processing, software carries out data analysis processing based on a designed algorithm, and the average value of 10 repeated measurement data of each measurement point of a voltage source to be calibrated is taken as a measurement result V X Uncertainty is given by a GUM evaluation method, and the display value of a three-phase standard source is V N According to the formula Δ = VX-V N And obtaining the indication error of the corrected alternating current voltage source. And when the laboratory computer judges that the calibrated voltage source does not meet the technical index requirements according to the measurement data, the automatic calibration software of the calibration site computer is started to finish the automatic calibration of the calibrated voltage source.
The remote automatic calibration of the alternating voltage source is as follows:
full scale calibration of an alternating current voltage source:
the method for solving the linear function by adopting two points comprises the following steps:
Y＝k0*X+b0(1)
BY＝k1*X+b1(2)
y is the current display value, k0 and b0 are the current coefficients, the corresponding coefficients can be obtained from the memory of the device after authorization is passed, and BY is the standard value.
(1) From the device display values, the current X can be calculated.
(2) And reading a standard value BY1 when the fullness is measured, adjusting to any equipment state point to obtain a standard value BY2, and respectively calculating to obtain X1 and X2 according to the current display value and k0 and b 0. Then Y1= k 1X 1+ b1, Y2= k 1X 2+ b1, and k1= (BY 1-BY 2) is derived from BY1= k 1X 1+ b1 and BY2= k 1X 2+ b1
And v (X1-X2), b1= BY1- (k 1 × X1), namely, new calibration coefficients k1 and b1 are obtained, the calculated values are written into the device through a command, and meanwhile, in order to ensure that the measured value of the device is closer to the true value, a multi-time averaging method can be adopted to optimize the coefficients k and b.
The remote automatic calibration of the ac voltage source further comprises: zero calibration of an alternating voltage source:
(1) After the device linearly calibrates the full scale, the zero point needs to be calibrated, the loop is disconnected, and the zero point average value zero1 recorded in a period of time is adopted.
(2) Calculating a linearity formula zero2= k 0X + b0+ zero0 (zero 0 is an initial zero point) according to a formula by commanding to continuously read zero values for a period of time to obtain zero2; zero2 and zero1 give a Δ zero; then zeroN =Δzero-zero0 is available from zero1= k 0X + b0+ zero0+ Δ zero, and finally the zeroN value is written to the device by command.
As shown in fig. 3, the system of the present embodiment establishes a private network on a public network using a Virtual Private Network (VPN) function. The virtual private network gateway realizes a remote access technology by encrypting a transmission data packet and converting a target IP address of the data packet, and realizes remote encryption communication among a plurality of client PCs.
(1) In general, a virtual private network gateway has a dual-network structure of an internal network and an external network, and the external network accesses the internet using a public network IP.
(2) And the terminal A of the public network accesses the terminal B of the internal network, and the destination address of the access data packet sent by the terminal A is the internal IP address of the terminal B.
(3) The virtual private network gateway of the public network checks a target address of an access data packet sent by the terminal A when receiving the access data packet, if the target address belongs to an address of the intranet, the data packet is encapsulated in a different mode according to different virtual private network technologies, meanwhile, the virtual private network gateway constructs a new virtual private network data packet, the original encapsulated data packet is used as a load of the virtual private network data packet, and the target address of the virtual private network data packet is an external address of the virtual private network gateway of the intranet.
(4) The virtual private network gateway of the public network transmits the virtual private network packet to the Internet, and since the destination address of the virtual private network packet is the external address of the virtual private network gateway of the intranet, the packet is correctly transmitted to the virtual private network gateway of the intranet by the route in the Internet.
(5) The virtual private network gateway of the intranet checks the received data packet, and if the data packet is found to be sent from the virtual private network gateway of the public network, the data packet can be judged to be a virtual private network data packet, and the data packet is unpacked. The unpacking process mainly comprises the steps of stripping the packet head of the virtual private network data packet, and then reversely processing and restoring the data packet into an original data packet.
(6) The virtual private network gateway of the intranet transmits the restored original data packet to the destination terminal B, and since the destination address of the original data packet is the IP of the terminal B, the data packet can be correctly transmitted to the terminal B. The data packet it receives appears to terminal B as if it was sent directly from terminal a.
(7) The packet processing procedure from terminal B back to terminal a is the same as described above, so that the terminals in the two networks can communicate with each other.
In the remote calibration method for the alternating current voltage source of the embodiment, the calibration of the alternating current voltage source is realized by measuring the voltage difference value of the voltage source to be detected relative to the standard voltage source.
Firstly, selecting a high-precision voltage-frequency conversion module, converting standard and detected voltage parameters into pulse signals with corresponding frequencies by using the voltage-frequency conversion module, taking the pulse signals as door closing pulses of a time interval counter, taking second pulses synchronized by a GPS satellite receiver as door opening pulses of the time interval counter, and measuring time difference values of the GPS satellite pulses and local pulses at two ends respectively.
And secondly, transmitting the detected data to a metering standard laboratory end through the Internet, and subtracting the two time difference values to obtain the time difference between the local pulse signals at the two ends, namely the time difference between the standard voltage source and the voltage source to be calibrated. And obtaining the frequency difference corresponding to the two ends through the corresponding relation between the time deviation and the frequency deviation, namely obtaining the voltage difference of the two ends, and finishing the remote calibration process of the alternating voltage source.
The voltage deviation in the remote calibration system of the embodiment corresponds to the frequency deviation, and the frequency deviation causes the generation of the time deviation, so that a relation model of the relative frequency deviation and the relative time deviation can be established. The relative frequency deviation measurement model of the calibration system is as follows:
wherein, Δ f is the frequency deviation (i.e. the frequency value of the AC voltage source end to be detected minus the frequency value of the standard source end) at both ends, and f is the frequency deviation A In order to calibrate the frequency at the laboratory end,
is the relative frequency deviation of the two ends, and deltat is the time deviation of the two ends (i.e. the time difference of the source end of the AC voltage to be corrected minus the time difference of the standard source end), t A In order to calibrate the time at the laboratory end,
k and b are two constant parameters for relative time deviation of two ends.
The calibration system standard voltage source of this embodiment selects the TD4530 three-phase alternating current-direct current on-site calibration instrument of the permanent measurement and control company in south lake, and TD4530 has integrated three-phase alternating current standard source, direct current standard source, and three-phase alternating current is measured, and multiple functions such as direct current small-signal measurement are applicable to calibration alternating current sampling device, direct current transmitter, three-phase alternating current-direct current electrical measurement instrument, with periodic table, alternating current electric energy meter etc. main technical indicator is shown as table 1:
TABLE 1
Note: (1) RD is the reading value, RG is the range value, (2) 750V, 1000V range is the range of line voltage UAB
The TD4530 three-phase AC/DC standard source supports full-automatic or semi-automatic verification, data management and certificate export of a detected table.
The monolithic integrated V/F converter is widely used in many fields such as automatic control, digital instrument and radio equipment, etc. for performing corresponding conversion between voltage and frequency. The anti-interference capability of the frequency conversion circuit is enhanced after the voltage is converted into the frequency signal, and the application is very convenient. In the actual signal conversion process, the main conversion modes include a multi-resonant mode and a charge balance mode. Since the charge balance type voltage frequency conversion device has higher accuracy than other devices, the system of the embodiment selects the charge balance type voltage frequency conversion module.
The calibration system of the present embodiment selects a high-precision universal counter of type SYN5636 of synchronous electronic technology limited, west ampere. The counter is a high-cost-performance time interval and frequency testing instrument, a time base standard is matched with a high-precision 0CX0 constant-temperature crystal oscillator, the performance is reliable, the measuring precision is high, the range is wide, the sensitivity is high, and the dynamic range is large. The frequency measurement resolution can reach 12bit/s, the measured frequency range is up to 24GHz, and the single time interval resolution reaches 100ps, so that the requirement of the calibration system is met. In addition, the counter also has various data communication interfaces, which is convenient for real-time transmission of the measured data and the like.
The calibration system of this embodiment selects the SYN4102 GPS synchronous clock of the electronic technology for synchronization in west ann. The phase-locked clock frequency source is a high-precision phase-locked clock frequency source, receives GPS satellite signals through an antenna, enables the output frequency of an internal constant-temperature crystal oscillator to be synchronous with the cesium atomic clock signals of the GPS satellite, and has good frequency signal stability and accuracy. Which can provide a high precision time frequency standard on the order of cesium clocks.
After the receiver receives and stabilizes the satellite signals, the receiver outputs two paths of standard 10MHz sine signals, and the frequency accuracy is less than or equal to 2E-12; meanwhile, the receiver can output 1 path of 1PPS pulse signals, the level is in a TTL format, and the synchronization error is less than or equal to 30ns. The calibration system of the embodiment is intended to take the synchronous 1PPS pulse signal of the receiver as a standard signal source, and perform the quantity transmission comparison of the time frequency signals at two ends of the system.
The core part of the voltage source remote calibration system software is a calibration system control module and a calibration data processing module, the system software controls a calibration flow and collects time difference data of a time interval counter in real time and stores the time difference data, and the traditional manual operation, eye observation and handwriting recording processes are replaced. After the test process is finished, the calibration data is stored in a database, the software carries out data analysis processing based on a designed algorithm, and the average value of 10 repeated measurement data of each measurement point of the calibrated voltage source is taken as a measurement result V X Uncertainty is given by a GUM evaluation method, and the display value of a three-phase standard source is V N According to the formula Δ = V X -V N And obtaining the indication error of the corrected alternating current voltage source.
And when the laboratory computer judges that the calibrated voltage source does not meet the technical index requirements according to the measurement data, the automatic calibration software of the calibration site computer is started to finish the automatic calibration of the calibrated voltage source. The remote automatic calibration procedure for the alternating voltage is as follows:
the remote automatic calibration procedure of the alternating voltage source is as follows:
full scale calibration of an alternating current voltage source:
the method for solving the linear function by adopting two points comprises the following steps:
Y＝k0*X+b0 (1)
BY＝k1*X+b1 (2)
y is the current display value, k0 and b0 are the current coefficients, the corresponding coefficients can be obtained from the memory of the device after authorization is passed, and BY is the standard value.
(1) From the device display values, the current X can be calculated.
(2) And reading a standard value BY1 when the fullness is read, adjusting to any equipment state point to obtain a standard value BY2, and respectively calculating according to the current display value and k0 and b0 to obtain X1 and X2. Then Y1= k1 × X1+ b1, Y2= k1 × X2+ b1, and k1= (BY 1-BY 2)/(X1-X2) is obtained from BY1= k1 × X1+ b1 and BY2= k1 × X2+ b1, that is, new calibration coefficients k1 and b1 are obtained, and the calculated values are written into the device BY a command, and meanwhile, in order to ensure that the measured values of the device are closer to the true values, we can adopt a multiple averaging method to optimize the k and b coefficients.
Zero calibration of an alternating voltage source:
(1) After the device is linearly calibrated to full scale, the zero point needs to be calibrated, the loop is disconnected, and the zero point average value zero1 recorded in a period of time is adopted.
(2) Calculating a linearity formula zero2= k 0X + b0+ zero0 (zero 0 is an initial zero point) according to a formula by commanding to continuously read zero values for a period of time to obtain zero2; zero2 and zero1 give a Δ zero; then zeroN =Δzero-zero0 can be obtained from zero1= k 0X + b0+ zero0+ Δ zero, and finally the value of zeroN is written to the device by a command.
In this embodiment, to calibrate the ac voltage source, the voltage difference between the voltage source to be detected and the standard voltage source is mainly measured. Firstly, designing a high-precision voltage-frequency conversion module, converting voltage parameters output by a laboratory-end standard voltage source and a field voltage source to be corrected into pulse signals with corresponding frequencies by using the voltage-frequency conversion module, taking the pulse signals as door closing pulses of a time interval counter, taking second pulses synchronized by a GPS satellite receiver as door opening pulses of the time interval counter, and measuring time difference values of the GPS satellite pulses and local pulses at two ends respectively. And then, transmitting data of the source end of the voltage to be corrected to a laboratory end through the Internet, and subtracting the two time difference values to obtain the time difference between the local pulse signals at the two ends, namely the time difference between the standard voltage source and the voltage source to be corrected. And obtaining the frequency difference corresponding to the two ends through the corresponding relation between the time deviation and the frequency deviation, namely obtaining the voltage difference of the two ends, and finishing the remote calibration process of the direct-current voltage source.
As a specific example, in the embodiment, calibration work is carried out according to DL/T1112-2019 'AC/DC instrument testing device calibration procedure', and a TD4530 three-phase AC/DC on-site calibrator of Henan Tian constant measurement and control company in lake is selected as a standard voltage source.
The selected calibrated equipment is a KF86 portable intelligent substation comprehensive tester, and the technical parameters are shown in the table 2:
TABLE 2
And the mutual access between the laboratory computer and the calibration field computer is realized through a VPN networking mode. After laboratory personnel confirm through the video monitoring system that the calibration site environment and wiring are correct, according to portable intelligent substation comprehensive tester technical indicator, select the calibration scheme of formulating in advance on laboratory computer automatic calibration software, click "begin the calibration", three-phase standard voltage source, portable intelligent substation comprehensive tester will synchronous output corresponding measuring point voltage. After the test process is finished, the calibration data is stored in a database, the software carries out data analysis processing based on a designed algorithm, and the average value of 10 repeated measurement data of each measurement point of the calibrated voltage source is taken as a measurement result V X Uncertainty is given by a GUM evaluation method, and the display value of a three-phase standard source is V N According to the formula Δ = V X -V N And obtaining the indication error of the corrected alternating current voltage source. The laboratory computer generated calibration certificate data is shown in table 3 below:
TABLE 3
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. An alternating current voltage source remote calibration system, characterized by: the device comprises two time interval counters, wherein one end of the first time interval counter is connected with one end of a laboratory computer, and the other end of the laboratory computer, a three-phase standard source, a first voltage frequency conversion module and the other end of the first time interval counter are sequentially connected;
one end of the second time interval counter is connected with one end of the calibration site computer, and the other end of the calibration site computer, the alternating current voltage source and the second voltage frequency conversion module are sequentially connected with the other end of the second time interval counter;
the voltage-frequency conversion module converts the standard and detected voltage parameters into pulse signals with corresponding frequencies, the pulse signals are used as door closing pulses of a time interval counter, second pulses synchronized by a GPS satellite receiver are used as door opening pulses of the time interval counter, and time difference values of the GPS satellite pulses and local pulses are measured at two ends of the time interval counter respectively;
the laboratory computer judges whether the alternating voltage source to be calibrated meets the technical index requirements or not according to the test data, and when the alternating voltage source to be calibrated does not meet the technical index requirements, the alternating voltage source to be calibrated is automatically calibrated;
the laboratory computer collects the values of the two time interval counters, the time difference between the local pulse signals at the two ends is obtained by subtracting the two time difference values, namely the time difference between the standard voltage source and the voltage source to be corrected, the frequency difference corresponding to the two ends can be obtained through the corresponding relation between the time deviation and the frequency deviation, the voltage difference at the two ends is obtained, and the remote calibration of the alternating current voltage source is completed.
2. The system of claim 1, wherein: the laboratory computer comprises a control module, a configuration information management module, a measurement state display module and a report generation module, wherein the configuration information management module, the measurement state display module and the report generation module are connected with the control module; wherein:
the configuration information management module completes task allocation and man-machine interaction of the system, and realizes recording of information such as a standard source and the model of the calibrated instrument and selection of a calibration report storage path;
the measurement state display module displays the measurement point, the measurement progress and the measurement time difference data in real time;
and the report generation module generates a calibration report according to the designed AC voltage source calibration report template.
3. The system of claim 2, wherein: the control module controls the calibration process, implements the whole calibration process according to the set calibration process, and stores the real-time difference data to the designated position of the computer; taking the average value of the repeated measurement data of each measurement point of the voltage source to be corrected as a measurement result V X Uncertainty is given by a GUM evaluation method, and the display value of a three-phase standard source is V N According to the formula Δ = V X -V N Obtaining the indication error of the corrected alternating current voltage source; and when the voltage source to be calibrated does not meet the technical index requirements according to the measurement data, starting automatic calibration software of a calibration site computer to finish the automatic calibration of the voltage source to be calibrated.
4. The system of claim 2, wherein: the automatic calibration process of the alternating voltage source is as follows:
full scale calibration of an alternating current voltage source:
two points are used to solve a linear function, which is as follows:
Y＝k0*X+b0 (1)
BY＝k1*X+b1 (2)
y is a current display value, k0 and b0 are current coefficients, corresponding coefficients can be obtained from a memory of the equipment after authorization is passed, and BY is a standard value; calculating to obtain current X;
reading a standard value BY1 during the fullness, adjusting to any equipment state point, taking a standard value BY2, and respectively calculating according to the current display value and k0 and b0 to obtain X1 and X2;
then Y1= k1 × X1+ b1, Y2= k1 × X2+ b1, and based on BY1= k1 × X1+ b1 and BY2= k1 × X2+ b1, k1= (BY 1-BY 2)/(X1-X2) is obtained, and b1= BY1- (k 1 × X1), i.e. new calibration coefficients k1 and b1 are obtained.
5. The system of claim 4, wherein: the remote automatic calibration of the ac voltage source further comprises:
zero calibration of an alternating voltage source:
after the device linearly calibrates the full scale, calibrating the zero point, disconnecting the loop, and adopting the zero point average value zero1 recorded in a period of time;
continuously reading zero values for a period of time, and calculating a linearity formula zero2= k 0X + b0+ zero0 according to the formula to obtain zero2; zero2 and zero1 give a Δ zero; then zero n =Δzero-zero0 can be obtained from zero1= k 0X + b0+ zero0+ Δ zero, zero0 being the initial zero point.
6. The system of claim 1, wherein: the corresponding relation model of the time deviation and the frequency deviation is as follows:
wherein, Δ f is the frequency deviation between the two ends, i.e. the frequency value of the AC voltage source end to be detected minus the frequency value of the standard source end, f A In order to calibrate the frequency at the laboratory end,
is the relative frequency deviation of the two ends, and delta t is the time deviation of the two ends, i.e. the time difference of the source end of the alternating voltage is subtracted from the time difference of the standard source end, t A In order to calibrate the time at the laboratory end,
k and b are two constant parameters which are relative time deviations of two ends.
7. A remote calibration method for an alternating current voltage source is characterized by comprising the following steps: the method comprises the following steps:
firstly, selecting a high-precision voltage-frequency conversion module, converting standard and detected voltage parameters into pulse signals with corresponding frequencies by using the voltage-frequency conversion module, taking the pulse signals as door closing pulses of a time interval counter, taking second pulses synchronized by a GPS satellite receiver as door opening pulses of the time interval counter, and respectively measuring time difference values of the GPS satellite pulses and local pulses at two ends;
secondly, transmitting the detected data to a metering standard laboratory end through the Internet, and subtracting the two time difference values to obtain the time difference between the local pulse signals at the two ends, namely the time difference between a standard voltage source and a voltage source to be calibrated; and obtaining the frequency difference corresponding to the two ends through the corresponding relation between the time deviation and the frequency deviation, namely obtaining the voltage difference of the two ends, and finishing the remote calibration process of the alternating current voltage source.
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