A calibration device and method for ultra-high-voltage instrument transformers at high altitudes

Abstract

This invention discloses a calibration device and method for ultra-high voltage (UHV) transformers at high altitudes. The device includes an isolation transformer, an upper-level reactor, a lower-level reactor, an upper-level standard transformer, a lower-level standard transformer, and a lifting platform. The upper-level reactor and the upper-level standard transformer are both mounted on the lifting platform. The upper-level reactor and the lower-level reactor are connected in series to form the inductance of a series resonant step-up circuit. The upper-level standard transformer and the lower-level standard transformer are connected in series to form a 1000kV UHV standard AC transformer for calibration. During testing, all equipment casings are grounded. The secondary measurement circuits of the UHV standard AC transformer and the UHV transformer under test are simultaneously connected to the transformer calibrator. The isolation transformer is controlled to step up the voltage via a voltage regulator, calibrating the ratio error and phase error of the UHV transformer under test within the 0-1000kV range. This invention can meet the on-site testing needs of UHV power transformers in high-altitude areas.

Description

Technical Field

[0001] This invention relates to the field of instrument transformer field verification technology, and more specifically, to a verification device and method for high-altitude ultra-high voltage instrument transformers. Background Technology

[0002] Before an ultra-high voltage (UHV) substation is put into operation, UHV voltage transformers typically need to pass on-site testing. During on-site testing, accuracy verification of the UHV voltage transformers is required. A set of on-site standard voltage transformer equipment is used for error comparison and verification of the UHV power transformers. During the verification process, the UHV power transformers are in a non-operating state, and the on-site standard voltage transformer verification device must have voltage boosting capability, capable of raising the AC voltage to 1000kV and maintaining stability for a certain period.

[0003] Existing UHV voltage transformer calibration platforms are mounted on freight trucks, forming an integrated vehicle-mounted calibration platform for UHV voltage transformers. This platform uses series resonant voltage boosting and carries a cascaded 1000kV standard voltage transformer, significantly improving testing efficiency and reducing disassembly and installation costs. However, for UHV voltage transformers operating at high altitudes, the existing integrated vehicle-mounted calibration platform suffers from insulation breakdown due to discharge at high altitudes, making calibration tests impossible.

[0004] Therefore, it is necessary to improve the structure of the existing UHV transformer vehicle-mounted integrated verification platform and propose a UHV transformer verification device suitable for high-altitude areas. Summary of the Invention

[0005] This invention proposes a calibration device and method for ultra-high voltage instrument transformers at high altitudes to solve the problem of how to perform on-site calibration of ultra-high voltage power instrument transformers in high-altitude areas.

[0006] To address the aforementioned problems, according to one aspect of the present invention, a high-altitude ultra-high voltage transformer calibration device is provided. The device includes: an isolation transformer, an upper-level reactor, a lower-level reactor, an upper-level standard, a lower-level standard, and a lifting platform. The upper-level reactor and the upper-level standard are both mounted on the lifting platform. The upper-level reactor and the lower-level reactor are connected in series to form the inductor of a series resonant step-up circuit. The upper-level standard and the lower-level standard are connected in series to form a 1000kV ultra-high voltage standard transformer for calibration.

[0007] In this configuration, one end of the isolation transformer is connected to an external power supply, and the other end of the isolation transformer is connected to the lower end of the lower-level reactor via a guide rod; the equalizing ring at the upper end of the lower-level reactor is connected to the lower end of the upper-level reactor; the equalizing ring at the upper end of the upper-level reactor is connected to the upper end of the upper-level standard; the lower end of the upper-level standard is equipotentially connected to the equalizing ring of the lower-level standard, so that the upper-level standard and the lower-level standard are connected in parallel in the circuit after being connected in series; the equalizing ring of the upper-level standard is connected to the ultra-high voltage power transformer under test.

[0008] During testing, all equipment casings are grounded, and the secondary measurement circuits of the UHV standard AC instrument transformer and the UHV power instrument transformer under test are simultaneously connected to the instrument transformer calibrator. The isolation transformer is controlled by a voltage regulator to step up the voltage, and the ratio error and phase error of the UHV power instrument transformer under test are calibrated within the range of 0-1000kV.

[0009] Preferably, the isolation transformer is manufactured using SF6 gas sealing at 0.4 MPa.

[0010] Preferably, the equalizing rings of the upper and lower reactors are 20% larger in diameter than those in low-altitude areas, and insulating sleeves are provided on the upper and lower reactors; umbrella skirts are added to the insulating sleeves on the outside of the upper and lower reactors.

[0011] Preferably, the equalizing ring diameter of the upper standard is greater than or equal to 1080 mm, the equalizing ring diameter of the lower standard is greater than or equal to 1560 mm, and the upper standard is provided with an insulating skirt with a diameter greater than or equal to 260 mm.

[0012] Preferably, the device further includes a vehicle-mounted platform for placing the isolation transformer, the lower-level reactor, the lower-level standard, and the lifting platform on the vehicle-mounted platform.

[0013] According to another aspect of the present invention, a method for calibrating ultra-high voltage transformers based on the high-altitude ultra-high voltage transformer calibration device described above is provided, the method comprising:

[0014] The isolation transformer draws 380V power from the substation site, steps it up to 30kV, and then transmits it to the lower end of the downstream reactor through a conductor rod.

[0015] Manipulate the lifting platform to raise it to the highest position, and connect the upper equalizing ring of the lower reactor to the lower end of the upper reactor to form a series resonant circuit based on the isolation transformer, the lower reactor and the upper reactor;

[0016] The equalizing ring of the upper reactor is connected to the upper end of the upper standard, and the lower end of the upper standard is connected to the equalizing ring of the lower standard at the same potential.

[0017] The isolation transformer is stepped up to 1000kV, and the resonance factor is adjusted by adjusting the inductance of the downstream reactor.

[0018] Connect the equalizing ring of the upper-level standard to the UHV power transformer under test via wires, ground all equipment casings, and simultaneously connect the secondary measurement circuits of the UHV standard AC transformer and the UHV power transformer under test to the transformer calibrator. Control the isolation transformer to step up the voltage through the voltage regulator, and calibrate the ratio error and phase error of the UHV power transformer under test within the range of 0-1000kV.

[0019] Preferably, the isolation transformer is manufactured using SF6 gas sealing at 0.4 MPa.

[0020] Preferably, the equalizing rings of the upper and lower reactors are 20% larger in diameter than those in low-altitude areas, and insulating sleeves are provided on the upper and lower reactors; umbrella skirts are added to the insulating sleeves on the outside of the upper and lower reactors.

[0021] Preferably, the equalizing ring diameter of the upper standard is greater than or equal to 1080 mm, the equalizing ring diameter of the lower standard is greater than or equal to 1560 mm, and the upper standard is provided with an insulating skirt with a diameter greater than or equal to 260 mm.

[0022] Preferably, the method further includes:

[0023] The isolation transformer, lower-level reactor, lower-level standard, and lifting platform are all placed on the vehicle-mounted platform.

[0024] This invention provides a calibration device and method for high-altitude ultra-high voltage (UHV) transformers. The device includes an isolation transformer, an upper-level reactor, a lower-level reactor, an upper-level standard transformer, a lower-level standard transformer, and a lifting platform. The upper-level reactor and the upper-level standard transformer are both mounted on the lifting platform. The upper-level reactor and the lower-level reactor are connected in series to form the inductance of a series resonant step-up circuit. The upper-level standard transformer and the lower-level standard transformer are connected in series to form a 1000kV UHV standard AC transformer for calibration. During testing, all equipment casings are grounded. The secondary measurement circuits of the UHV standard AC transformer and the UHV transformer under test are simultaneously connected to the transformer calibrator. The isolation transformer is controlled by a voltage regulator to step up the voltage, calibrating the ratio error and phase error of the UHV transformer under test within the 0-1000kV range. This invention fills the gap in the current calibration platform and usage method for error calibration of UHV power transformers in high-altitude areas. It is convenient to measure and can meet the on-site testing needs of UHV power transformers in high-altitude areas. Attached Figure Description

[0025] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures:

[0026] Figure 1 This is a schematic diagram of the structure of a high-altitude ultra-high voltage transformer calibration device 100 according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of a vehicle-mounted calibration device for high-altitude ultra-high voltage instrument transformers according to an embodiment of the present invention.

[0028] Figure 3 This is a flowchart of a high-altitude ultra-high voltage transformer verification method 300 according to an embodiment of the present invention. Detailed Implementation

[0029] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0030] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0031] This invention addresses the insulation weaknesses of existing UHV transformer vehicle-mounted integrated testing platforms, including corona discharge caused by excessively small equalizing rings, lack of bushing skirts in compensating reactors, and lack of external insulation protection measures for isolation transformers. It proposes a new high-altitude UHV transformer testing device to meet the on-site testing needs of UHV power transformers in high-altitude areas.

[0032] Figure 1 This is a schematic diagram of the structure of a high-altitude ultra-high voltage transformer calibration device 100 according to an embodiment of the present invention. Figure 1 As shown, the high-altitude UHV transformer calibration device provided by this embodiment fills the gap in the current calibration platform for error calibration of UHV power transformers in high-altitude areas. It is convenient for measurement and can meet the on-site testing needs of UHV power transformers in high-altitude areas. The high-altitude UHV transformer calibration device 100 provided by this embodiment includes: an isolation transformer 101, an upper-level reactor 102, a lower-level reactor 103, an upper-level standard 104, a lower-level standard 105, and a lifting platform 106.

[0033] The upper-level reactor and the upper-level standard are both located on the lifting platform. The upper-level reactor and the lower-level reactor are connected in series to form the inductor of the series resonant boost circuit. The upper-level standard and the lower-level standard are connected in series to form the 1000kV UHV standard interactive inductor for calibration.

[0034] In this configuration, one end of the isolation transformer is connected to an external power supply, and the other end of the isolation transformer is connected to the lower end of the lower-level reactor via a guide rod; the equalizing ring at the upper end of the lower-level reactor is connected to the lower end of the upper-level reactor; the equalizing ring at the upper end of the upper-level reactor is connected to the upper end of the upper-level standard; the lower end of the upper-level standard is equipotentially connected to the equalizing ring of the lower-level standard, so that the upper-level standard and the lower-level standard are connected in parallel in the circuit after being connected in series; the equalizing ring of the upper-level standard is connected to the ultra-high voltage power transformer under test.

[0035] During testing, all equipment casings are grounded, and the secondary measurement circuits of the UHV standard AC instrument transformer and the UHV power instrument transformer under test are simultaneously connected to the instrument transformer calibrator. The isolation transformer is controlled by a voltage regulator to step up the voltage, and the ratio error and phase error of the UHV power instrument transformer under test are calibrated within the range of 0-1000kV.

[0036] Preferably, the isolation transformer is manufactured using SF6 gas sealing at 0.4 MPa.

[0037] Preferably, the equalizing rings of the upper and lower reactors are 20% larger in diameter than those in low-altitude areas, and insulating sleeves are provided on the upper and lower reactors; umbrella skirts are added to the insulating sleeves on the outside of the upper and lower reactors.

[0038] Preferably, the equalizing ring diameter of the upper standard is greater than or equal to 1080 mm, the equalizing ring diameter of the lower standard is greater than or equal to 1560 mm, and the upper standard is provided with an insulating skirt with a diameter greater than or equal to 260 mm.

[0039] Preferably, the device further includes a vehicle-mounted platform for placing the isolation transformer, the lower-level reactor, the lower-level standard, and the lifting platform on the vehicle-mounted platform.

[0040] Combination Figure 2 As shown, in this invention, the vehicle-mounted calibration platform structure for high-altitude ultra-high voltage transformers includes: an isolation transformer module ①, a reactor module (upper-level reactor ②, lower-level reactor ③), a standard module (upper-level standard ④, lower-level standard ⑤), a lifting platform module ⑥, and a vehicle-mounted platform ⑦.

[0041] The isolation transformer module is located at the rear of the vehicle-mounted calibration platform for high-altitude ultra-high voltage instrument transformers, near the driver's cab. It is made with 0.4 MPa SF6 gas seal to ensure that the isolation transformer has a high insulation level in high-altitude areas.

[0042] The upper-level reactor and the lower-level reactor are located on the lifting platform module and the vehicle platform, respectively. The upper-level reactor and the lower-level reactor are connected in series to form the inductance of the series resonant boost circuit of the platform. The equalizing rings of the upper-level reactor and the lower-level reactor have a diameter that is 20% larger than that of the low-altitude area. In addition, the bushings of the reactors should be equipped with insulating bushings to ensure that the vehicle-mounted calibration platform for high-altitude UHV transformers can still work normally in high-altitude areas.

[0043] The upper-level and lower-level standard devices are located on the lifting platform module and the vehicle-mounted platform, respectively. The upper-level and lower-level standard devices are connected in series to form the 1000kV UHV standard AC transformer for calibration of the platform. The equalizing rings of the upper-level and lower-level standard devices are 20% larger in diameter than those in low-altitude areas. That is, the diameter of the equalizing ring of the upper-level standard device is not less than 1080mm, and the diameter of the equalizing ring of the lower-level standard device is not less than 1560mm. In addition, the arm of the upper-level standard device uses a larger diameter insulating skirt, that is, the skirt diameter is not less than 260mm, in order to cope with the creepage distance in high-altitude areas.

[0044] The lifting platform module is fixed to the vehicle platform and can be lowered to the lowest height during transportation and raised to the highest height during use to ensure insulation from the ground, which facilitates equipment transportation and testing.

[0045] The SF6 gas-sealed isolation transformer, the large equalizing ring design, the addition of insulating bushings with awnings to the reactor, and the use of larger diameter awnings on the upper-level standard arm bushing provided by this invention can ensure that there will be no insulation flashover problem during the calibration test of the 1000kV UHV instrument transformer in high-altitude and low-pressure environments.

[0046] Figure 3 This is a flowchart of a high-altitude ultra-high voltage transformer verification method 300 according to an embodiment of the present invention. Figure 3 As shown, the UHV transformer verification method 300 based on the high-altitude UHV transformer verification device described above, provided by the embodiment of the present invention, starts from step 301. In step 301, the isolation transformer takes 380V power from the substation site, steps it up to 30kV, and then transmits it to the lower end of the lower reactor through the conductor rod.

[0047] In step 302, the lifting platform is raised to its highest position, and the equalizing ring at the upper end of the lower reactor is connected to the lower end of the upper reactor to form a series resonant circuit based on the isolation transformer, the lower reactor, and the upper reactor.

[0048] In step 303, the equalizing ring of the upper reactor is connected to the upper end of the upper standard, and the lower end of the upper standard is connected to the equalizing ring of the lower standard at the same potential.

[0049] In step 304, the isolation transformer is stepped up to 1000kV, and the resonant factor is adjusted by adjusting the inductance of the downstream reactor.

[0050] In step 305, the equalizing ring of the upper standard is connected to the UHV power transformer under test via a wire, all equipment casings are grounded, and the secondary measurement circuits of the UHV standard AC transformer and the UHV power transformer under test are simultaneously connected to the transformer calibrator. The isolation transformer is controlled to step up the voltage through the voltage regulator, and the ratio error and phase error of the UHV power transformer under test are calibrated within the range of 0-1000kV.

[0051] Preferably, the isolation transformer is manufactured using SF6 gas sealing at 0.4 MPa.

[0052] Preferably, the equalizing rings of the upper and lower reactors are 20% larger in diameter than those in low-altitude areas, and insulating sleeves are provided on the upper and lower reactors; umbrella skirts are added to the insulating sleeves on the outside of the upper and lower reactors.

[0053] Preferably, the equalizing ring diameter of the upper standard is greater than or equal to 1080 mm, the equalizing ring diameter of the lower standard is greater than or equal to 1560 mm, and the upper standard is provided with an insulating skirt with a diameter greater than or equal to 260 mm.

[0054] Preferably, the method further includes:

[0055] The isolation transformer, lower-level reactor, lower-level standard, and lifting platform are all placed on the vehicle-mounted platform.

[0056] Specifically, in this invention, the verification process is as follows:

[0057] Step 1: Figure 2 The vehicle-mounted platform and the equipment on the platform shown are hoisted into the interior of a truck of the corresponding size;

[0058] Step 2: The isolation transformer takes 380V power from the substation site, steps it up to 30kV, and then transmits it to the lower end of the downstream reactor through the conductor rod. The isolation transformer winding and other working equipment are all in SF6 gas, which has good insulation capabilities.

[0059] Step 3: Operate the lifting platform to raise it to the highest position. Connect the upper equalizing ring of the lower reactor to the lower end of the upper reactor to ensure that the upper reactor and the lower reactor are connected in series in the circuit.

[0060] Step 4: The equalizing ring at the upper end of the upper reactor is connected to the upper end of the upper standard, and the lower end of the upper standard is connected to the equalizing ring of the lower standard at the same potential, so as to ensure that the upper and lower standards are connected in series and in parallel in the circuit.

[0061] Step 5: Steps 1 to 3 have formed a series resonant circuit. To calibrate the 1000kV voltage transformer, the voltage needs to be increased to 1000kV. The resonance factor is related to the circuit inductance and capacitance. The resonance factor can be adjusted by adjusting the inductance of the downstream reactor.

[0062] Step 6: Connect the equalizing ring of the upper standard instrument to the UHV power transformer in the test station through conductive copper wire. After all equipment casings are grounded, connect the secondary measurement circuits of the UHV standard transformer and the UHV power transformer to the transformer calibrator at the same time. Control the isolation transformer to step up the voltage through the voltage regulator, and calibrate the ratio error and phase error of the UHV power transformer in the range of 0-1000kV.

[0063] This invention first designs an isolation transformer sealed with SF6 gas at 0.4 MPa to ensure a sufficiently high breakdown field strength. Second, the diameter of the equalizing rings of the upper and lower reactors and the standard transformer is increased by 20% to ensure sufficient insulation capacity during pressurization and to prevent corona discharge due to insufficient ring size during testing. Third, awnings are added to the external insulating bushings of the upper and lower reactors to increase the surface flashover creepage distance. Finally, the diameter of the upper standard transformer arm bushing is increased to enhance its insulation withstand voltage. Based on the above design and usage method of the high-altitude UHV transformer vehicle-mounted calibration platform, full-range calibration of UHV power transformers at high altitudes can be achieved.

[0064] The present invention has been described with reference to a few embodiments. However, it will be apparent to those skilled in the art that other embodiments besides those disclosed above fall equivalently within the scope of the present invention.

[0065] Generally, all terms used in this invention are interpreted according to their ordinary meaning in the art, unless otherwise expressly defined herein. All references to “a / the / the [device, component, etc.]” ​​are openly interpreted as at least one instance of said device, component, etc., unless otherwise expressly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed unless explicitly stated otherwise.

[0066] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can 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, etc.) containing computer-usable program code.

[0067] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can 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, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0068] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0069] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. A high-altitude ultra-high voltage transformer calibration device, characterized in that, The device includes: an isolation transformer, an upper-level reactor, a lower-level reactor, an upper-level standard, a lower-level standard, and a lifting platform. The upper-level reactor and the upper-level standard are both mounted on the lifting platform. The upper-level reactor and the lower-level reactor are connected in series to form the inductor of a series resonant step-up circuit. The upper-level standard and the lower-level standard are connected in series to form a 1000kV UHV standard AC instrument transformer for calibration. In this configuration, one end of the isolation transformer is connected to an external power supply, and the other end of the isolation transformer is connected to the lower end of the lower-level reactor via a guide rod; the equalizing ring at the upper end of the lower-level reactor is connected to the lower end of the upper-level reactor; the equalizing ring at the upper end of the upper-level reactor is connected to the upper end of the upper-level standard; the lower end of the upper-level standard is equipotentially connected to the equalizing ring of the lower-level standard, so that the upper-level standard and the lower-level standard are connected in parallel in the circuit after being connected in series; the equalizing ring of the upper-level standard is connected to the ultra-high voltage power transformer under test. During testing, all equipment casings are grounded, and the secondary measurement circuits of the UHV standard AC instrument transformer and the UHV power instrument transformer under test are simultaneously connected to the instrument transformer calibrator. The isolation transformer is controlled by a voltage regulator to step up the voltage, and the ratio error and phase error of the UHV power instrument transformer under test are calibrated within the range of 0-1000kV. The equalizing rings of the upper and lower reactors are 20% larger in diameter than those in low-altitude areas, and insulating sleeves are provided on the outside of the upper and lower reactors; umbrella skirts are added to the insulating sleeves on the outside of the upper and lower reactors. The equalizing ring diameter of the upper-level standard is greater than or equal to 1080 mm, the equalizing ring diameter of the lower-level standard is greater than or equal to 1560 mm, and the upper-level standard is provided with an insulating skirt with a diameter greater than or equal to 260 mm.

2. The apparatus according to claim 1, characterized in that, The isolation transformer is manufactured using SF6 gas sealing with a pressure of 0.4 MPa.

3. The apparatus according to claim 1, characterized in that, The device also includes a vehicle-mounted platform for placing the isolation transformer, the lower-level reactor, the lower-level standard, and the lifting platform on the vehicle-mounted platform.

4. A method for calibrating an ultra-high voltage transformer based on the high-altitude ultra-high voltage transformer calibration device according to any one of claims 1-3, characterized in that, The method includes: The isolation transformer draws 380V power from the substation site, steps it up to 30kV, and then transmits it to the lower end of the downstream reactor through a conductor rod. Manipulate the lifting platform to raise it to the highest position, and connect the upper equalizing ring of the lower reactor to the lower end of the upper reactor to form a series resonant circuit based on the isolation transformer, the lower reactor and the upper reactor; The equalizing ring of the upper reactor is connected to the upper end of the upper standard, and the lower end of the upper standard is connected to the equalizing ring of the lower standard at the same potential. The isolation transformer is stepped up to 1000kV, and the resonance factor is adjusted by adjusting the inductance of the downstream reactor. Connect the equalizing ring of the upper-level standard to the UHV power transformer under test via wires, ground all equipment casings, and simultaneously connect the secondary measurement circuits of the UHV standard AC transformer and the UHV power transformer under test to the transformer calibrator. Control the isolation transformer to step up the voltage through the voltage regulator, and calibrate the ratio error and phase error of the UHV power transformer under test within the range of 0-1000kV.

5. The method according to claim 4, characterized in that, The isolation transformer is manufactured using SF6 gas sealing with a pressure of 0.4 MPa.

6. The method according to claim 4, characterized in that, The equalizing rings of the upper and lower reactors are 20% larger in diameter than those in low-altitude areas, and insulating sleeves are provided on the outside of the upper and lower reactors; umbrella skirts are added to the insulating sleeves on the outside of the upper and lower reactors.

7. The method according to claim 4, characterized in that, The equalizing ring diameter of the upper-level standard is greater than or equal to 1080 mm, the equalizing ring diameter of the lower-level standard is greater than or equal to 1560 mm, and the upper-level standard is provided with an insulating skirt with a diameter greater than or equal to 260 mm.

8. The method according to claim 4, characterized in that, The method further includes: The isolation transformer, lower-level reactor, lower-level standard, and lifting platform are all placed on the vehicle-mounted platform.

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