CN211086575U - Device for checking secondary measurement system of direct-current voltage transformer - Google Patents
Device for checking secondary measurement system of direct-current voltage transformer Download PDFInfo
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Abstract
The utility model discloses a device for being directed at direct current voltage transformer secondary measurement system carries out the check-up, include: the standard direct current source unit is used for outputting a first voltage signal according to the synchronous trigger signal and extracting; the voltage acquisition unit is used for measuring a second voltage signal output by the secondary measurement system of the direct-current voltage transformer according to the received synchronous trigger signal; the main control unit is used for sending a control instruction as the synchronous trigger signal; the direct current voltage transformer secondary measurement system is used for verifying the direct current voltage transformer secondary measurement system according to the first voltage signal and the second voltage signal; and the storage unit is used for storing data. The utility model discloses a calibration equipment has realized carrying out the independent check-up to direct current voltage transformer secondary measurement system under the high voltage condition is not applyed to the primary bus side of direct current transformer, has avoided because the long-time potential safety hazard that brings under rated voltage of direct current high voltage power supply, very big improvement direct current voltage transformer on-the-spot check-up work efficiency.
Description
Technical Field
The utility model relates to a smart machine calibration technical field to more specifically, relate to a device that is used for carrying out the check-up to direct current voltage transformer secondary measurement system.
Background
The direct current voltage transformer is used as key equipment of an extra-high voltage direct current transmission project and a flexible direct current transmission project, provides voltage signals for control and protection of a direct current transmission system, and directly influences safe and stable operation of the direct current transmission system through accurate measurement performance.
In a direct current converter station, a direct current voltage transformer is mostly of an analog output type, and the field verification generally adopts an integral error verification mode. The direct current voltage transformer usually has an error out-of-tolerance link after long-term operation, and the out-of-tolerance link generally appears in a secondary measurement system of the direct current voltage transformer. Therefore, in the field calibration process, the error adjustment of the secondary measurement system of the direct current voltage transformer is required. Because the output signal of the secondary measurement system of the direct current transformer needs to be provided for a control and protection system of the converter station and redundancy backup is considered, each direct current voltage transformer is generally provided with a plurality of sets of independent secondary measurement systems, and therefore each direct current voltage transformer needs to carry out a plurality of field verification tests, so that the problems of long time consumption and low efficiency of field verification of the direct current transformer are caused, and a direct current high-voltage power supply needs to run under a rated voltage for a long time, so that certain potential safety hazard is brought to the field verification. The existing direct current transformer calibration devices are used for calibrating the integral error of the direct current transformer, and no device for calibrating a secondary measurement system of the direct current transformer exists.
Therefore, a device for independently checking a secondary measurement system of a direct current voltage transformer under the condition that high voltage is not applied to a primary bus side of the direct current transformer is needed, so that the potential safety hazard caused by long-time operation of a direct current high-voltage power supply under rated voltage is avoided, and efficient and safe field checking of the direct current voltage transformer is realized.
Disclosure of Invention
The utility model provides a device for carrying out the check-up to direct current voltage transformer secondary measurement system to solve how safely, carry out the problem of check-up to direct current voltage transformer secondary measurement system high-efficiently.
In order to solve the above problem, according to an aspect of the present invention, there is provided an apparatus for calibrating a secondary measurement system of a dc voltage transformer, the apparatus comprising:
The standard direct current source unit is respectively connected with the input end of the direct current voltage transformer secondary measurement system and the main control unit, and is used for outputting a first voltage signal to the direct current voltage transformer secondary measurement system according to the received synchronous trigger signal, collecting the first voltage signal and sending the first voltage signal to the main control unit;
The voltage acquisition unit is respectively connected with the output end of the secondary measurement system of the direct current voltage transformer and the main control unit, and is used for measuring a second voltage signal output by the secondary measurement system of the direct current voltage transformer according to the received synchronous trigger signal and sending the second voltage signal to the main control unit;
The main control unit is used for sending a control instruction as the synchronous trigger signal; the direct current voltage transformer secondary measurement system is used for verifying the direct current voltage transformer secondary measurement system according to the first voltage signal and the second voltage signal;
And the storage unit is connected with the main control unit and used for storing data.
Preferably, the standard dc source unit and the voltage acquisition unit both realize transmission of synchronous trigger signals and data with the main control unit through a General-Purpose Interface Bus (GPIB) and a GPIB control card.
Preferably, the Standard calibration stream source and the voltage acquisition unit are both capable of receiving control Commands in a Programmable instrument Standard Command (SCPI) SCPI format.
Preferably, the standard dc source unit is an interactive source meter instrument having both functions of outputting voltage signals and collecting voltage signals; or a combination device comprising a standard dc voltage source and a digital multimeter.
Preferably, wherein the apparatus further comprises:
And the clock synchronization unit is respectively connected with the standard direct current source unit and the voltage acquisition unit and is used for sending a pulse per second synchronization signal to the standard direct current source unit and the voltage acquisition unit as a synchronization trigger signal so that the standard direct current source unit and the voltage acquisition unit synchronously measure the voltage signal according to the pulse per second synchronization signal.
Preferably, the clock synchronization unit includes: an FPGA system, a synchronous module and an optical/electrical conversion module,
The FPGA system is used for receiving an external clock signal or a clock pulse signal generated by an internal crystal oscillator and detecting the frequency of the pulse signal;
The synchronization module is used for carrying out synchronization, frequency division and time keeping processing on the pulse per second signal with the preset frequency so as to obtain an electric synchronization signal with the preset frequency;
The electric/optical conversion module is configured to convert an electric synchronization signal with a preset frequency into an optical synchronization signal for output, where the optical synchronization signal is the pulse-per-second synchronization signal.
Preferably, wherein the apparatus further comprises:
And the upper computer is used for monitoring the operating parameters of the clock synchronization unit and controlling the frequency and duty ratio of the output signal of the clock synchronization unit.
Preferably, the main control unit further comprises:
And the setting module is used for configuring a synchronous triggering mode of the standard direct current source unit and the voltage acquisition unit.
Preferably, the main control unit adopts a parallel and sequential composite program structure, the start of verification, the data storage and the exit of the verification program are parallel operations, and the initialization, the data measurement and the data reading of the standard dc source unit and the voltage acquisition unit are sequential operations.
The utility model provides a device for being directed at direct current voltage transformer secondary measurement system carries out the check-up, include: the standard direct current source unit is used for applying a small voltage signal to the input end of the direct current voltage transformer secondary measurement system, the voltage acquisition unit is used for synchronously measuring a voltage signal output by the direct current voltage transformer secondary measurement system, and the main control unit is used for verifying the applied small voltage signal and the output voltage signal, so that the direct current voltage transformer secondary measurement system is independently verified under the condition that high voltage is not applied to the primary bus side of the direct current transformer, the potential safety hazard caused by long-time running of a direct current high-voltage power supply under rated voltage during error verification of the direct current transformer secondary measurement system is avoided, and the field verification working efficiency of the direct current voltage transformer is greatly improved.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings:
Fig. 1 is a schematic structural diagram of an apparatus 100 for verifying a secondary measurement system of a direct current voltage transformer according to an embodiment of the present invention; and
Fig. 2 is a schematic structural diagram of an apparatus 200 for verifying a secondary measurement system of a dc voltage transformer according to another embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, which, however, may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of thoroughly and completely disclosing the present invention and fully conveying the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments presented in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a schematic structural diagram of an apparatus 100 for verifying a dc voltage transformer secondary measurement system according to an embodiment of the present invention. As shown in fig. 1, the utility model discloses an embodiment provides a device for carrying out the check-up to direct current voltage transformer secondary measurement system has realized not applying the independent check-up to direct current voltage transformer secondary measurement system under the high voltage condition in direct current transformer primary bus side, has avoided because the potential safety hazard that direct current high voltage power supply brought under rated voltage for a long time runs when direct current transformer secondary measurement system error check-up, very big improvement direct current voltage transformer on-the-spot check-up work efficiency. The utility model discloses an embodiment provides a device 100 that is used for carrying out the check-up to direct current voltage transformer secondary measurement system, include: the calibration current source unit 101, the voltage acquisition unit 102, the main control unit 103 and the storage unit 104.
Preferably, the calibration current source unit 101 is connected to the input end of the dc voltage transformer secondary measurement system and the main control unit, respectively, and is configured to output a first voltage signal to the dc voltage transformer secondary measurement system according to the received synchronous trigger signal, and acquire and send the first voltage signal to the main control unit.
Preferably, the standard dc source unit is an interactive source meter instrument having both functions of outputting voltage signals and collecting voltage signals; or a combination device comprising a standard dc voltage source and a digital multimeter.
Preferably, the standard dc source unit and the voltage acquisition unit both realize the transmission of synchronous trigger signals and data with the main control unit through a GPIB bus and a GPIB control card.
Preferably, the standard calibration current source and the voltage acquisition unit are both capable of receiving control instructions in SCPI format.
the main function of the checking device of the secondary measurement system of the dc voltage transformer is to realize that the master control processing unit has functions of data processing and sending control commands and the like under the condition that high voltage is not applied to the primary bus side of the dc transformer, the master control processing unit sends control commands to the standard dc source unit and the voltage acquisition unit through a GPIB cable and a GPIB control card respectively, the master control processing unit applies dozens of volts of dc voltage signals to the input end of the secondary measurement system of the dc voltage transformer and carries out recovery on the output dc voltage signals, the control voltage acquisition unit carries out synchronous sampling on the dc voltage signals of the output end of the secondary measurement system of the dc voltage transformer through a GPIB cable and the GPIB control card, and transmits the dc voltage sampling signals of the input end and the output end of the secondary measurement system of the dc voltage transformer to the host computer of the master control unit for data processing, and calculates the error of the secondary measurement system of the dc voltage transformer according to the received data, in-process, the master control processing unit and the master control processing unit send out synchronous trigger control commands of the master control signal of the synchronous sampling of the standard dc voltage transformer and the GPIB cable.
In an embodiment of the present invention, the standard dc source unit has an analog dc voltage port and a GPIB port. The standard direct current source unit outputs and measures high-precision direct current voltage through an analog direct current voltage port, and receives a control synchronization trigger signal control instruction sent by the main control unit and transmits data through an IEEE-488 bus by utilizing a GPIB port. The standard direct current source unit is used as a test power supply for checking the secondary measurement system of the direct current voltage transformer and also used as a standard measurement device for a checking test, and is used for measuring a voltage signal on the primary side and sending the voltage signal to the main control unit. The standard direct current source unit can adopt an interactive source meter instrument with a Keithley 2450 model, can also adopt the same series of source meters with similar parameter functions, and can also adopt the combination of a similar standard direct current voltage source and a digital multi-purpose meter to realize the source meter functions, wherein the standard direct current voltage source is used for outputting direct current voltage signals, and the digital multi-purpose meter is used for measuring the direct current voltage signals.
Preferably, the voltage acquisition unit 102 is connected to the output end of the secondary measurement system of the dc voltage transformer and the main control unit, respectively, and is configured to measure a second voltage signal output by the secondary measurement system of the dc voltage transformer according to the received synchronous trigger signal, and send the second voltage signal to the main control unit.
The utility model discloses an among the embodiment, voltage acquisition unit has analog voltage sampling port and GPIB port, the control command of compatible SCPI form. The voltage acquisition unit measures a voltage output signal of the secondary measurement system of the direct current transformer through the analog voltage sampling port, and receives a control instruction and transmits data through an IEEE-488 bus by utilizing a GPIB port. The voltage acquisition unit has the main functions of sampling the output signal of the secondary measurement system of the direct current transformer according to the received synchronous trigger signal and transmitting the sampling data to the main control unit through the GPIB port. The voltage acquisition unit can adopt a digital multimeter of Agilent34410A or Agilent 34465A model, and also can be a digital multimeter or an A/D sampling card with the same series and similar parameter functions.
Preferably, the main control unit 103 is configured to issue a control instruction as the synchronization trigger signal; and the second voltage signal is used for verifying the secondary measurement system of the direct current voltage transformer according to the first voltage signal and the second voltage signal.
Preferably, the main control unit adopts a parallel and sequential composite program structure, the start of verification, the data storage and the exit of the verification program are parallel operations, and the initialization, the data measurement and the data reading of the standard dc source unit and the voltage acquisition unit are sequential operations.
the utility model discloses an among the embodiment, the main control unit is the controller based on Windows operation, and the operation has the host computer application software based on L abVIEW development, and its main function is through GPIB control card and GPIB cable remote control standard direct current source unit and voltage acquisition unit, handle and the error calculation to the sampled data of direct current source unit and voltage acquisition unit, operation human-computer interaction interface etc. wherein, the main control unit basis first voltage signal and second voltage signal are right direct current voltage transformer secondary measurement system checks up, include:
Wherein, the error is the check error; u shape 1Is a first voltage signal; u shape 2Is a second voltage signal; k is the transformation ratio of the direct current voltage transformer.
the upper computer of the main control unit adopts a parallel and sequential composite program structure, the starting, storing and exiting programs are parallel structures, the initialization, measurement and data reading of the standard direct current source unit and the voltage acquisition unit are sequential structures, and the functions of graphical display of sampling original data, configuration and storage of instrument parameters, tabular display of measurement results, storage of measurement results in Excel forms and the like can be realized.
Preferably, the storage unit 104 is connected to the main control unit for data storage.
Preferably, wherein the apparatus further comprises:
And the clock synchronization unit is respectively connected with the standard direct current source unit and the voltage acquisition unit and is used for sending a pulse per second synchronization signal to the standard direct current source unit and the voltage acquisition unit as a synchronization trigger signal so that the standard direct current source unit and the voltage acquisition unit synchronously measure the voltage signal according to the pulse per second synchronization signal.
Preferably, the clock synchronization unit includes: FPGA system, synchronization module and optical/electric conversion module.
Preferably, the FPGA system is configured to receive an external clock signal or a clock pulse signal generated by an internal crystal oscillator and detect a frequency of the pulse signal.
Preferably, the synchronization module is configured to perform synchronization, frequency division, and time keeping processing on the pulse per second signal with the preset frequency to obtain the electrical synchronization signal with the preset frequency.
Preferably, the electric/optical conversion module is configured to convert an electric synchronization signal with a preset frequency into an optical synchronization signal for output, where the optical synchronization signal is the pulse-per-second synchronization signal.
Preferably, wherein the apparatus further comprises:
And the upper computer is used for monitoring the operating parameters of the clock synchronization unit and controlling the frequency and duty ratio of the output signal of the clock synchronization unit.
Preferably, the main control unit further comprises:
And the setting module is used for configuring a synchronous triggering mode of the standard direct current source unit and the voltage acquisition unit.
Fig. 2 is a schematic structural diagram of an apparatus 200 for verifying a secondary measurement system of a dc voltage transformer according to another embodiment of the present invention. As shown in fig. 2, compared with fig. 1, the apparatus includes a clock synchronization unit, which is respectively connected to the standard dc source unit and the voltage acquisition unit. At this time, the standard dc source unit and the voltage collecting unit both include: and the clock synchronization unit sends a pulse per second synchronization signal to the standard direct current source unit and the voltage acquisition unit through the clock synchronization trigger port to serve as a synchronization trigger signal.
The utility model discloses an among the embodiment, clock synchronization unit is by the Field-editable Gate Array (FPGA) system of the soft nuclear of Nios, RS232 serial ports module, synchronization module and light/electricity conversion module component, and its main function is at electric synchronization port and the synchronous port output 1Hz second pulse synchronizing signal of light. The FPGA system is used for receiving an external clock signal or a clock signal generated by an internal crystal oscillator, detecting the frequency of the clock signal and controlling the work of other modules; the RS232 serial port module is used for communicating with an upper computer, monitoring relevant parameters of the clock synchronization unit in real time and controlling the frequency and duty ratio of an output signal; the synchronization module is used for synchronizing, dividing frequency and keeping time of the 1Hz pulse signal to obtain an electric synchronization signal of 1Hz, and selecting and reversely processing an output signal; the electric/optical conversion module is used for converting the 1Hz electric synchronous signal into an optical synchronous signal to be output so as to control the synchronous triggering of the standard direct current source unit and the voltage acquisition unit.
At this time, when the verification device comprises a clock synchronization unit, the main control unit is further configured to configure a synchronous triggering mode of the standard dc source unit and the voltage acquisition unit to determine whether to trigger according to a control instruction of the main control unit or according to a pulse per second signal of the clock synchronization unit, so that the synchronous triggering measurement of the standard dc source unit and the voltage acquisition unit can be realized through an SCPI-format coupling control instruction of an IEEE-488 bus in a GPIB cable and a GPIB control card, and the hardware synchronous triggering measurement of the standard dc source unit and the voltage acquisition unit can also be realized by using the pulse per second signal output by the clock synchronization unit.
The utility model discloses an embodiment provides a direct current voltage transformer secondary measurement system calibration equipment can be applied to third party measurement detection mechanism, scientific research institute and direct current transformer check-up equipment manufacture factory for develop analog output type direct current voltage transformer's on-the-spot error check-up work, realized the independent check-up to analog output type direct current voltage transformer secondary measurement system, very big improvement the work efficiency of on-the-spot check-up.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the above disclosed are equally possible within the scope of the invention, as would be apparent to a person skilled in the art, as defined by the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents of the embodiments of the invention may be made without departing from the spirit and scope of the invention, which should be construed as falling within the scope of the claims of the invention.
Claims (9)
1. An apparatus for verifying a direct current voltage transformer secondary measurement system, the apparatus comprising:
The standard direct current source unit is respectively connected with the input end of the direct current voltage transformer secondary measurement system and the main control unit, and is used for outputting a first voltage signal to the direct current voltage transformer secondary measurement system according to the received synchronous trigger signal, collecting the first voltage signal and sending the first voltage signal to the main control unit;
The voltage acquisition unit is respectively connected with the output end of the secondary measurement system of the direct current voltage transformer and the main control unit, and is used for measuring a second voltage signal output by the secondary measurement system of the direct current voltage transformer according to the received synchronous trigger signal and sending the second voltage signal to the main control unit;
The main control unit is used for sending a control instruction as the synchronous trigger signal; the direct current voltage transformer secondary measurement system is used for verifying the direct current voltage transformer secondary measurement system according to the first voltage signal and the second voltage signal;
And the storage unit is connected with the main control unit and used for storing data.
2. The device of claim 1, wherein the standard current source unit and the voltage acquisition unit both realize the transmission of synchronous trigger signals and data with the main control unit through a GPIB bus and a GPIB control card.
3. The apparatus of claim 1, wherein the nominal current source and the voltage acquisition unit are each capable of receiving control commands in SCPI format.
4. The apparatus of claim 1, wherein the standard calibration current source unit is an interactive source meter instrument having both functions of outputting voltage signals and collecting voltage signals; or a combination device comprising a standard dc voltage source and a digital multimeter.
5. The apparatus of claim 1, further comprising:
And the clock synchronization unit is respectively connected with the standard direct current source unit and the voltage acquisition unit and is used for sending a pulse per second synchronization signal to the standard direct current source unit and the voltage acquisition unit as a synchronization trigger signal so that the standard direct current source unit and the voltage acquisition unit synchronously measure the voltage signal according to the pulse per second synchronization signal.
6. The apparatus of claim 5, wherein the clock synchronization unit comprises: an FPGA system, a synchronous module and an optical/electrical conversion module,
The FPGA system is used for receiving an external clock signal or a clock pulse signal generated by an internal crystal oscillator and detecting the frequency of the pulse signal;
The synchronization module is used for carrying out synchronization, frequency division and time keeping processing on the pulse per second signal with the preset frequency so as to obtain an electric synchronization signal with the preset frequency;
The electric/optical conversion module is configured to convert an electric synchronization signal with a preset frequency into an optical synchronization signal for output, where the optical synchronization signal is the pulse-per-second synchronization signal.
7. The apparatus of claim 5, further comprising:
And the upper computer is used for monitoring the operating parameters of the clock synchronization unit and controlling the frequency and duty ratio of the output signal of the clock synchronization unit.
8. The apparatus of claim 5, wherein the master unit further comprises:
And the setting module is used for configuring a synchronous triggering mode of the standard direct current source unit and the voltage acquisition unit.
9. The device of claim 1, wherein the main control unit adopts a parallel and sequential composite program structure, the start of verification, the data storage and the exit of the verification program are parallel operations, and the initialization, the data measurement and the data reading of the standard direct current source unit and the voltage acquisition unit are sequential operations.
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| CN201921176065.6U CN211086575U (en) | 2019-07-24 | 2019-07-24 | Device for checking secondary measurement system of direct-current voltage transformer |
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| CN201921176065.6U CN211086575U (en) | 2019-07-24 | 2019-07-24 | Device for checking secondary measurement system of direct-current voltage transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441724A (en) * | 2019-07-24 | 2019-11-12 | 国网新疆电力有限公司电力科学研究院 | A kind of device for being verified to DC voltage transformer secondary measuring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110441724A (en) * | 2019-07-24 | 2019-11-12 | 国网新疆电力有限公司电力科学研究院 | A kind of device for being verified to DC voltage transformer secondary measuring system |
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Effective date of registration: 20210902 Address after: 830011 No.200 Hengda street, Changchun middle road, high tech Zone, Urumqi, Xinjiang Uygur Autonomous Region Patentee after: Marketing service center of State Grid Xinjiang Electric Power Co., Ltd. (capital intensive center, metering center) Patentee after: CHINA ELECTRIC POWER RESEARCH INSTITUTE Co.,Ltd. Patentee after: STATE GRID CORPORATION OF CHINA Address before: 830011 No.200 Hengda street, high tech Industrial Development Zone, Xinshi District, Urumqi, Xinjiang Uygur Autonomous Region Patentee before: STATE GRID XINJIANG ELECTRIC POWER CO., LTD., ELECTRIC POWER Research Institute Patentee before: CHINA ELECTRIC POWER RESEARCH INSTITUTE Co.,Ltd. Patentee before: STATE GRID CORPORATION OF CHINA |
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