阅读说明：本技术 特高压直流电压互感器现场校验平台及其校验方法 (Special high-voltage direct-current voltage transformer field calibration platform and calibration method thereof ) 是由 黄奇峰 卢树峰 张亦苏 王忠东 徐敏锐 纪峰 杨世海 陈刚 赵双双 孙军 陆子刚 于 2021-07-07 设计创作，主要内容包括：本发明公开了一种特高压直流电压互感器现场校验平台及其校验方法,用于直流互感器校验工作,涉及直流互感器校验领域。本发明包括控制电源、变压器、倍压发生器、直流标准装置以及平台,其中倍压发生器和直流标准装置采用分级绝缘设计,分为上级发生器F-(1)、上级直流标准装置H-(1)和下级直流标准装置H-(2)、下级发生器F-(2)。下级倍压发生器和控制电源、变压器以及下级直流标准装置组合可满足超高压直流电压互感器校验需求；上、下级倍压发生器、直流标准装置、控制电源、变压器以及平台组合可满足特高压直流电压互感器校验需求；本发明实现了特高压直流电压互感器校验电源的小型化设计,使用灵活、便捷,特别适合于特高压或超高压直流电压互感器现场校验工作。(The invention discloses an extra-high voltage direct-current voltage transformer field calibration platform and a calibration method thereof, which are used for direct-current transformer calibration work and relate to the field of direct-current transformer calibration. The invention comprises a control power supply, a transformer, a voltage doubling generator, a direct current standard device and a platform, wherein the voltage doubling generator and the direct current standard device adopt a graded insulation design and are divided into a superior generator F 1 Upper level DC standard device H 1 And a lower level DC standard device H 2 Lower stage generator F 2 . The combination of the lower-level voltage doubling generator, the control power supply, the transformer and the lower-level direct-current standard device can meet the requirement of the calibration of the ultrahigh-voltage direct-current voltage transformer; upper and lower stage voltage doubling generationThe combination of the device, the direct current standard device, the control power supply, the transformer and the platform can meet the check requirement of the extra-high voltage direct current voltage transformer; the invention realizes the miniaturized design of the extra-high voltage direct-current voltage transformer calibration power supply, is flexible and convenient to use, and is particularly suitable for the on-site calibration work of extra-high voltage or extra-high voltage direct-current voltage transformers.)

1. The special high-voltage direct-current voltage transformer field calibration platform comprises a calibration platform base, an upper stage platform, a lifter capable of driving the upper stage platform to move up and down, a lower stage platform, a control power supply, a transformer, a voltage doubling generator and a direct-current standard device; the method is characterized in that:

a control power supply and a transformer are installed at one end of a calibration platform base, an upper stage platform is arranged at the middle section of the calibration platform base, and an upper stage platform and a direct current standard device are arranged at the other end of the calibration platform base; the upper platform is lifted by a lifter which can drive the upper platform to move up and down;

the input end of the control power supply is connected with a test field power supply through a power line, and the output end of the control power supply is connected with the input end of the transformer;

the voltage doubling generator comprises a lower-level voltage doubling generator and a higher-level voltage doubling generator, the lower-level voltage doubling generator is fixedly arranged on a lower-level platform, and the higher-level voltage doubling generator is fixedly arranged on a higher-level platform;

the output end of the transformer is connected with the input end of a lower-level voltage doubling generator, and the output end of the lower-level voltage doubling generator is cascaded with the input end of a higher-level voltage doubling circuit through a non-corona lead; the output end of the upper-level voltage doubling circuit is connected with a tested product; the upper-level voltage-multiplying generator and the lower-level voltage-multiplying generator are connected in series and can generate 800kV voltage by coordinating with the control power supply and the transformer; and a voltage-multiplying generator is provided with a voltage-equalizing ring.

2. The extra-high voltage direct current voltage transformer field calibration platform according to claim 1, characterized in that:

the voltage doubling generators are designed in a grading insulation series connection mode and comprise lower-level voltage doubling generators and upper-level voltage doubling generators; the rated voltage of the upper voltage doubling generator is 300kV, and the rated voltage of the lower voltage doubling generator is 500 kV;

the direct current standard device adopts a graded insulation series design and is divided into an upper direct current standard device and a lower direct current standard device; the lowest end of the higher voltage doubling generator is parallel to the highest end of the lower voltage doubling generator, and the output end of the lower voltage doubling generator is connected with the input end of the higher voltage doubling generator through a non-corona lead;

the lowest end of the upper direct current standard device is parallel to the highest end of the lower direct current standard device, and the output end of the lower direct current standard device is connected with the input end of the upper direct current standard device through a non-corona lead;

the upper-level direct current standard device is connected with the high-voltage end of the upper-level voltage doubling generator through a non-corona wire.

3. The extra-high voltage direct current voltage transformer field calibration platform according to claim 1, characterized in that:

the upper stage voltage doubling generator and the upper stage direct current standard device are arranged on an upper stage platform, and an insulating support and a lifter are arranged below the upper stage platform;

the lower stage voltage doubling generator, the lower stage direct current standard device, the control power supply and the transformer are arranged on the lower stage platform; and the equipment on the upper and lower platforms can be disassembled and assembled.

4. The extra-high voltage direct current voltage transformer field calibration platform according to claim 1, characterized in that: the left end part of the vertical beam of the outer frame of the superior platform is provided with 3 left flanges A1, A2 and A3;

3 flanges are arranged at the right side end of the lower platform outer frame vertical beam and correspond to flanges of upper platforms A1, A2 and A3, and the flanges are B1, B2 and B3 respectively; the connection of the upper platform and the lower platform is realized through the connection of A1B1, A2B2 and A3B 3; the upper and lower stage platforms can be connected and separated through the flanges, and combined use and separated use are achieved.

5. The extra-high voltage direct current voltage transformer field calibration platform according to claim 1, characterized in that:

the grading ring is divided into a lower grading ring, a middle grading ring and a top grading ring; the top equalizer ring is installed at higher level voltage-multiplying generator top, the middle equalizer ring is installed in higher level voltage-multiplying generator bottom and is the insulating base outside, the bottom equalizer ring is installed in subordinate voltage-multiplying generator top.

6. The extra-high voltage direct current voltage transformer field calibration platform according to claim 1, characterized in that:

the upper-stage voltage-multiplying generator consists of an upper-stage shell, SF6 insulating gas and an upper-stage voltage-multiplying circuit;

the lower-stage voltage-multiplying generator consists of a lower-stage shell, SF6 insulating gas and a lower-stage voltage-multiplying circuit;

the upper-level shell and the lower-level shell are both epoxy glass barrel structures, and the diameters, thicknesses and materials are completely the same; the upper-stage voltage doubling circuit and the upper-stage insulating support are arranged in an upper-stage shell, and SF6 gas is filled in the upper-stage shell and is used for internal insulation of the upper-stage voltage doubling generator; the lower stage voltage doubling circuit and the lower stage insulating support are arranged in the lower stage shell, and SF6 gas is filled in the lower stage shell and is used for internal insulation of the lower stage voltage doubling generator;

the upper-level voltage doubling circuit consists of 1 silicon stack group and 2 capacitors; the 2-path capacitor bank is formed by connecting 3n capacitors with capacitance of C in series, wherein n is a natural number greater than 1; the 1-path silicon stack group is formed by connecting 3n-3 same silicon stacks in series; the 2-path capacitor bank is divided into a left capacitor column and a right capacitor column, and the left capacitor column and the right capacitor column are vertically and upwards arranged in the shell in parallel; the silicon stack group is obliquely and upwards arranged inside the shell;

the lower-stage voltage doubling circuit consists of a 1-path silicon stack group and 2-path capacitors; the 2-path capacitor bank is formed by connecting 5n capacitors with capacitance of C in series; the 1-path silicon stack group is formed by connecting 5n-5 same silicon stacks in series; the installation mode is the same as that of the upper-stage voltage-multiplying circuit.

7. The extra-high voltage direct current voltage transformer field calibration platform according to claim 1, characterized in that:

wherein, the output end of the lower stage voltage doubling circuit can generate 500kV voltage.

8. The extra-high voltage direct current voltage transformer field calibration platform according to claim 1, characterized in that:

the output end of the transformer generates a 10kHz intermediate-frequency sine wave.

9. The method for realizing the on-site verification of the extra-high voltage direct current voltage transformer by adopting the on-site verification platform of the extra-high voltage direct current voltage transformer, which is defined by any one of claims 1 to 8, is characterized by comprising the following steps:

(1) sending the extra-high voltage direct-current voltage transformer on-site calibration platform to a test site;

(2) wiring: grounding the control power supply, the transformer, the lower-level voltage doubling generator, the lower-level direct current standard device and the tested direct current transformer; connecting the input end of a control power supply with an on-site power supply, connecting the output end of the control power supply with the input end of a transformer, connecting the output end of the transformer with the input end of a lower-level voltage doubling generator, connecting the output end of the lower-level voltage doubling generator with a higher-level voltage doubling generator in series by using a non-corona lead, and connecting the output end of the higher-level voltage doubling generator with a tested direct-current voltage transformer and the high-voltage end of a higher-level direct-current standard device by using a non-corona lead; finishing secondary wiring of an extra-high voltage direct-current voltage transformer test;

(3) the elevator drives the upper platform to rise to the height set by the upper platform test;

(4) supporting the superior platform with an insulating support;

(5) lowering the lift to a minimum height;

(6) adjusting a control power supply, generating voltages of 80kV, 160kV, 400kV, 640kV and 800kV through an upper-level voltage multiplier and a lower-level voltage multiplier after generating medium voltage through a transformer, providing test voltages for a tested direct current voltage transformer and a direct current standard device, and recording errors of the tested direct current transformer by an error measuring device;

(7) raising the elevator to the height set by the upper stage platform test;

(8) withdrawing the insulating support, and driving the upper platform to descend to the lowest height by the elevator;

(9) and (5) after the test is finished, dismantling the test wiring.

10. The method for realizing the field boosting verification of the ultra-high voltage direct current voltage transformer by adopting the field verification platform of the extra-high voltage direct current voltage transformer as claimed in any one of claims 1 to 8 is characterized by comprising the following steps:

(1) sending a lower platform in the extra-high voltage direct-current voltage transformer on-site verification platform to a test site;

(2) grounding the control power supply, the transformer, the lower-level voltage doubling generator, the lower-level direct current standard device and the tested direct current transformer; connecting the input end of a control power supply with an on-site power supply, connecting the output end of the control power supply with the input end of a transformer, connecting the output end of the transformer with a lower-level voltage doubling generator, and connecting the input end of the lower-level voltage doubling generator with a tested direct-current voltage transformer and a lower-level direct-current standard device by using a non-corona lead; finishing secondary wiring of an ultrahigh voltage direct current voltage transformer test;

(3) adjusting a control power supply, generating voltages of 40kV, 80kV, 250kV, 400kV and 500kV by an upper-level voltage multiplier and a lower-level voltage multiplier after generating medium voltage by a transformer, providing test voltages for a tested direct current voltage transformer and a standard direct current voltage transformer, and simultaneously recording the error of the tested direct current transformer by an error measuring device;

(4) and (5) after the test is finished, dismantling the test wiring.

Technical Field

The invention belongs to the technical field of direct current transformer calibration, and particularly relates to an extra-high voltage direct current voltage transformer on-site calibration platform and a calibration method.

Background

The extra-high voltage direct-current voltage transformer is key equipment of a direct-current extra-high voltage power grid and provides voltage signals for control, protection and measurement of the direct-current extra-high voltage power grid. The accuracy of the provided signal can directly influence the safe, stable and economic operation of the direct-current ultra-high voltage power grid. The extra-high voltage direct-current voltage transformer needs to be disassembled and transported to a field for installation, and during the disassembling, long-distance transportation, field installation and other processes, the conditions of part damage, installation error and the like can occur, so that the accuracy of the extra-high voltage direct-current voltage transformer is influenced, the operation of an extra-high voltage power grid is threatened, and therefore the development of verification on the operation of the direct-current transformer is particularly important.

Heretofore, field tests for direct current voltage transformers generally employed simple equipment at low voltage (10% rated voltage (U)_N) A rough check is made of the polarity and transformation ratio of the dc transformer. In fact, the error of the direct current voltage transformer changes along with the change of the voltage, and the error of the direct current voltage transformer measured under the small voltage is difficult to truly reflect the operation condition of the direct current voltage transformer. Only when the verification is carried out in the full voltage range, whether the measurement accuracy of the direct current voltage transformer meets the requirement or not can be accurately judged. JJG 1156-.

The technical difficulty of on-site verification of the extra-high voltage direct-current voltage transformer is high, the requirement on test equipment is high, the research on-site verification of the extra-high voltage transformer under full voltage is not many at present, and a corresponding on-site verification device is not available. The on-site checking device for the extra-high voltage DC voltage transformer consists ofThe calibration system comprises a calibration power supply, a standard device and an error measurement device, wherein the calibration power supply is a key component of the calibration system and needs to generate 10% U according to the regulation requirement_N、20％U_N、 50％U_N、80％U_N、100％U_NAnd the test voltage is supplied to the tested direct current voltage transformer and the standard voltage transformer. The extra-high voltage direct current transformer is provided with laboratory calibration equipment, the laboratory test equipment is very large in size and heavy in weight, the extra-high voltage direct current transformer laboratory calibration power supply with the largest size and the heaviest weight is more than 12 meters in height, and the weight is more than 10 tons.

The existing extra-high voltage direct current transformer is difficult to meet the accuracy requirement of field verification in a small voltage measurement mode, and if laboratory verification equipment of an extra-high voltage direct current transformer is transported to a test field to carry out work, the extra-high voltage direct current transformer is limited by road height, narrow field space of the field, huge and overweight test equipment and the like, and the extra-high voltage direct current transformer faces huge difficulties of transportation, placement, system construction and the like.

The transportation problem of the extra-high voltage direct current transformer on-site calibration device is solved through a turnover hydraulic mechanism in the prior art. However, the silicon stack is in a single-stage structure, the silicon stack is inverted during transportation, and the silicon stack is upright during testing.

Disclosure of Invention

The invention aims to provide a calibration device which can meet the on-site calibration requirement of an extra-high voltage direct-current voltage transformer, is convenient, flexible and accurate to use, has high safety coefficient and can be compatible with the on-site calibration of the extra-high voltage direct-current voltage transformer.

In order to achieve the purpose, the invention adopts the technical scheme that:

the special high-voltage direct-current voltage transformer field calibration platform comprises a calibration platform base, an upper stage platform, a lifter capable of driving the upper stage platform to move up and down, a lower stage platform, a control power supply, a transformer, a voltage doubling generator and a direct-current standard device; the method is characterized in that:

a control power supply and a transformer are installed at one end of a calibration platform base, an upper stage platform is arranged at the middle section of the calibration platform base, and an upper stage platform and a direct current standard device are arranged at the other end of the calibration platform base; the upper platform is lifted by a lifter which can drive the upper platform to move up and down;

the input end of the control power supply is connected with a test field power supply through a power line, and the output end of the control power supply is connected with the input end of the transformer;

the voltage doubling generator comprises a lower-level voltage doubling generator and a higher-level voltage doubling generator, the lower-level voltage doubling generator is fixedly arranged on a lower-level platform, and the higher-level voltage doubling generator is fixedly arranged on a higher-level platform;

the output end of the transformer is connected with the input end of a lower-level voltage doubling generator, and the output end of the lower-level voltage doubling generator is cascaded with the input end of a higher-level voltage doubling circuit through a non-corona lead; the output end of the upper-level voltage doubling circuit is connected with a tested product; the upper-level voltage-multiplying generator and the lower-level voltage-multiplying generator are connected in series and can generate 800kV voltage by coordinating with the control power supply and the transformer; and a voltage-multiplying generator is provided with a voltage-equalizing ring.

The present invention further includes the following preferred embodiments.

The voltage doubling generators are designed in a grading insulation series connection mode and comprise lower-level voltage doubling generators and upper-level voltage doubling generators; the rated voltage of the upper voltage doubling generator is 300kV, and the rated voltage of the lower voltage doubling generator is 500 kV;

the direct current standard device adopts a graded insulation series design and is divided into an upper direct current standard device and a lower direct current standard device; the lowest end of the higher voltage doubling generator is parallel to the highest end of the lower voltage doubling generator, and the output end of the lower voltage doubling generator is connected with the input end of the higher voltage doubling generator through a non-corona lead;

the lowest end of the upper direct current standard device is parallel to the highest end of the lower direct current standard device, and the output end of the lower direct current standard device is connected with the input end of the upper direct current standard device through a non-corona lead;

the upper-level direct current standard device is connected with the high-voltage end of the upper-level voltage doubling generator through a non-corona wire.

The upper stage voltage doubling generator and the upper stage direct current standard device are arranged on an upper stage platform, and an insulating support and a lifter are arranged below the upper stage platform;

the lower stage voltage doubling generator, the lower stage direct current standard device, the control power supply and the transformer are arranged on the lower stage platform; and the equipment on the upper and lower platforms can be disassembled and assembled.

The left end part of the vertical beam of the outer frame of the superior platform is provided with 3 left flanges A1, A2 and A3;

3 flanges are arranged at the right side end of the lower platform outer frame vertical beam and correspond to flanges of upper platforms A1, A2 and A3, and the flanges are B1, B2 and B3 respectively; the connection of the upper platform and the lower platform is realized through the connection of A1B1, A2B2 and A3B 3; the upper and lower stage platforms can be connected and separated through the flanges, and combined use and separated use are achieved.

The grading ring is divided into a lower grading ring, a middle grading ring and a top grading ring; the top equalizer ring is installed at higher level voltage-multiplying generator top, the middle equalizer ring is installed in higher level voltage-multiplying generator bottom and is the insulating base outside, the bottom equalizer ring is installed in subordinate voltage-multiplying generator top.

The upper-stage voltage-multiplying generator consists of an upper-stage shell, SF6 insulating gas and an upper-stage voltage-multiplying circuit;

the lower-stage voltage-multiplying generator consists of a lower-stage shell, SF6 insulating gas and a lower-stage voltage-multiplying circuit;

the upper-level shell and the lower-level shell are both epoxy glass barrel structures, and the diameters, thicknesses and materials are completely the same; the upper-stage voltage doubling circuit and the upper-stage insulating support are arranged in an upper-stage shell, and SF6 gas is filled in the upper-stage shell and is used for internal insulation of the upper-stage voltage doubling generator; the lower stage voltage doubling circuit and the lower stage insulating support are arranged in the lower stage shell, and SF6 gas is filled in the lower stage shell and is used for internal insulation of the lower stage voltage doubling generator;

the upper-level voltage doubling circuit consists of 1 silicon stack group and 2 capacitors; the 2-path capacitor bank is formed by connecting 3n capacitors with capacitance of C in series, wherein n is a natural number greater than 1; the 1-path silicon stack group is formed by connecting 3n-3 same silicon stacks in series; the 2-path capacitor bank is divided into a left capacitor column and a right capacitor column, and the left capacitor column and the right capacitor column are vertically and upwards arranged in the shell in parallel; the silicon stack group is obliquely and upwards arranged inside the shell;

the lower-stage voltage doubling circuit consists of a 1-path silicon stack group and 2-path capacitors; the 2-path capacitor bank is formed by connecting 5n capacitors with capacitance of C in series; the 1-path silicon stack group is formed by connecting 5n-5 same silicon stacks in series; the installation mode is the same as that of the upper-stage voltage-multiplying circuit.

Wherein, the output end of the lower stage voltage doubling circuit can generate 500kV voltage.

8. The extra-high voltage direct current voltage transformer field calibration platform according to claim 1, characterized in that:

the output end of the transformer generates a 10kHz intermediate-frequency sine wave.

The application also discloses a method for realizing the on-site calibration of the extra-high voltage direct current voltage transformer by adopting the on-site calibration platform of the extra-high voltage direct current voltage transformer, which is characterized by comprising the following steps:

(1) sending the extra-high voltage direct-current voltage transformer on-site calibration platform to a test site;

(2) wiring: grounding the control power supply, the transformer, the lower-level voltage doubling generator, the lower-level direct current standard device and the tested direct current transformer; connecting the input end of a control power supply with an on-site power supply, connecting the output end of the control power supply with the input end of a transformer, connecting the output end of the transformer with the input end of a lower-level voltage doubling generator, connecting the output end of the lower-level voltage doubling generator with a higher-level voltage doubling generator in series by using a non-corona lead, and connecting the output end of the higher-level voltage doubling generator with a tested direct-current voltage transformer and the high-voltage end of a higher-level direct-current standard device by using a non-corona lead; finishing secondary wiring of an extra-high voltage direct-current voltage transformer test;

(3) the elevator drives the upper platform to rise to the height set by the upper platform test;

(4) supporting the superior platform with an insulating support;

(5) lowering the lift to a minimum height;

(6) adjusting a control power supply, generating voltages of 80kV, 160kV, 400kV, 640kV and 800kV through an upper-level voltage multiplier and a lower-level voltage multiplier after generating medium voltage through a transformer, providing test voltages for a tested direct current voltage transformer and a direct current standard device, and recording errors of the tested direct current transformer by an error measuring device;

(7) raising the elevator to the height set by the upper stage platform test;

(8) withdrawing the insulating support, and driving the upper platform to descend to the lowest height by the elevator;

(9) and (5) after the test is finished, dismantling the test wiring.

A method for realizing field boosting verification of an ultra-high voltage direct current voltage transformer by adopting the extra-high voltage direct current voltage transformer field verification platform is characterized by comprising the following steps:

(1) sending a lower platform in the extra-high voltage direct-current voltage transformer on-site verification platform to a test site;

(2) grounding the control power supply, the transformer, the lower-level voltage doubling generator, the lower-level direct current standard device and the tested direct current transformer; connecting the input end of a control power supply with an on-site power supply, connecting the output end of the control power supply with the input end of a transformer, connecting the output end of the transformer with a lower-level voltage doubling generator, and connecting the input end of the lower-level voltage doubling generator with a tested direct-current voltage transformer and a lower-level direct-current standard device by using a non-corona lead; finishing secondary wiring of an ultrahigh voltage direct current voltage transformer test;

(3) adjusting a control power supply, generating voltages of 40kV, 80kV, 250kV, 400kV and 500kV by an upper-level voltage multiplier and a lower-level voltage multiplier after generating medium voltage by a transformer, providing test voltages for a tested direct current voltage transformer and a standard direct current voltage transformer, and simultaneously recording the error of the tested direct current transformer by an error measuring device;

(4) and (5) after the test is finished, dismantling the test wiring.

The invention achieves the following beneficial effects:

the invention provides an extra-high voltage direct-current voltage transformer field calibration platform and a calibration method, wherein a voltage doubler adopts a hierarchical design, the voltage doubler is ingeniously divided into two stages of 500kV and 300kV, a single stage is matched with a control power supply and a transformer to realize the boosting calibration of the extra-high voltage direct-current voltage transformer, the two-stage series operation can realize the boosting calibration of the extra-high voltage direct-current voltage transformer, and the use is flexible and convenient; the equipment is miniaturized and the transportation height of the equipment is reduced by the aid of the hierarchical design; the voltage doubling device adopts SF6 gas insulation, so that the weight is greatly reduced; the transformer generates a 10kHz intermediate frequency sine wave, the size and the weight of the capacitor are reduced, and the miniaturization design of the power supply device is further realized.

Drawings

FIG. 1 is a schematic block diagram of an extra-high voltage direct current voltage transformer field calibration platform checking extra-high voltage direct current voltage transformer according to an embodiment of the invention;

FIG. 2 is a schematic block diagram of an extra-high voltage direct current voltage transformer verified by an extra-high voltage direct current voltage transformer field verification platform according to an embodiment of the invention;

FIG. 3 is a schematic diagram of a total voltage doubling circuit of the extra-high voltage direct current transformer field calibration power supply according to the embodiment of the invention;

FIG. 4 is a flow chart of a method for realizing the calibration of an extra-high voltage direct current voltage transformer by using an extra-high voltage direct current transformer on-site calibration platform;

FIG. 5 is a flow chart of a method for realizing the calibration of an ultra-high voltage direct current voltage transformer by using an extra-high voltage direct current transformer on-site calibration platform;

FIG. 6 is a schematic structural diagram of an extra-high voltage direct-current voltage transformer on-site verification platform;

FIG. 7 is a top view of a lower stage platform of an extra-high voltage direct-current voltage transformer on-site verification platform;

FIG. 8 is a schematic diagram of an upper-level platform of an extra-high voltage direct-current voltage transformer field calibration platform.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby. The extra-high voltage direct current transformer on-site calibration power supply mainly comprises a control power supply, a transformer and a voltage doubling generator, wherein the extra-high voltage direct current transformer on-site calibration power supply firstly inputs an adjustable alternating voltage through rectification filtering and inversion of the control power supply, then outputs a medium voltage of 10kHz through medium voltage rectification of the transformer, and outputs a direct current high voltage signal through high voltage rectification of the voltage doubling generator.

As shown in fig. 1, 6, 7 and 8, the input end of the control power supply is connected with the test field power supply through a power line, the output end of the control power supply is connected with the input end of the transformer, one end of the output end of the transformer is grounded, the other end of the output end of the transformer is connected with the input end of the next-stage voltage-multiplying generator, and the output end of the next-stage voltage-multiplying generator is cascaded with the input end of the previous-stage voltage-multiplying circuit through a non-corona lead; the output end of the upper-level voltage doubling circuit is connected with a tested voltage transformer and a standard voltage transformer; at the moment, the upper-level voltage-multiplying generator and the lower-level voltage-multiplying generator are connected in series and work cooperatively with the control power supply and the transformer, and 800kV voltage can be generated;

the standard direct current voltage transformer and the tested direct current transformer are further connected with an error measuring device, the error measuring device synchronously collects voltage signals of the standard direct current voltage transformer and the tested direct current transformer, and errors of the tested direct current transformer are obtained through a direct comparison method.

As shown in fig. 2, the input end of the control power supply is connected with the test field power supply through a power line, the output end of the control power supply is connected with the input end of the transformer, one end of the output end of the transformer is grounded, the other end of the output end of the transformer is connected with the input end of the next-stage voltage-multiplying generator, and the output end of the next-stage voltage-multiplying generator is connected with the tested voltage transformer and the standard voltage transformer through a non-corona lead; at the moment, the lower-stage voltage doubling generator, the control power supply and the transformer work in a coordinated mode to generate 500kV voltage;

the standard direct current voltage transformer and the tested direct current transformer are further connected with an error measuring device, the error measuring device synchronously collects voltage signals of the standard direct current voltage transformer and the tested direct current transformer, and errors of the tested direct current transformer are obtained through a direct comparison method.

As shown in fig. 3, the voltage doubling circuit of the voltage doubling generator is composed of 1 silicon stack string and 2 high-voltage capacitor banks, and the voltage doubling circuit is used for voltage-doubling rectifying a 10kHz medium-voltage signal generated by a transformer into a dc high-voltage signal. The voltage doubling circuit is designed in two stages, and the two stages of voltage doubling circuits can be connected in series.

The voltage doubling generator adopts a hierarchical design and comprises an insulating base F₀Lower voltage doubler generator F₁And a superior voltage doubler generator F₂(ii) a Wherein the outer cylinders of the upper and lower voltage doubling generators are made of epoxy glass fiber, and the insulating medium is SF6, so that the volume is small and the weight is light; upper stage voltage doubler generator F₂Rated voltage of 300kV and lower-level voltage doubling generator F₂500kV, lower voltage doubling generator F₂The voltage-multiplying power supply is arranged on an insulating base, can be independently used and can also be connected with a superior voltage-multiplying generator in series for use. Equalizing rings are arranged at the top and the bottom of the upper-level voltage-multiplying generator and the lower-level voltage-multiplying generator.

As shown in fig. 4, the present application also discloses a method for implementing field voltage boosting verification of an extra high voltage dc voltage transformer by using the extra high voltage dc voltage transformer field verification power supply apparatus, which is characterized by comprising the following steps:

step SS1, grounding a control power supply, a transformer, a lower-level voltage-multiplying generator, a standard direct-current voltage transformer and a tested direct-current transformer;

step SS2, connecting the input end of a control power supply with a field power supply, connecting the output end of the control power supply with the input end of a transformer, connecting the output end of the transformer with the input end of a next-level voltage-multiplying generator, connecting the output end of the next-level voltage-multiplying generator with a previous-level voltage-multiplying generator in series by a non-corona lead, and connecting the output end of the previous-level voltage-multiplying generator with a tested direct-current voltage transformer and a standard direct-current voltage transformer by a non-corona lead;

step SS3, finishing secondary wiring of the extra-high voltage direct-current voltage transformer test;

step SS4, adjusting a control power supply, generating voltages of 80kV, 160kV, 400kV, 640kV and 800kV through an upper-level voltage multiplier and a lower-level voltage multiplier after generating medium voltage through a transformer, providing test voltages for a tested direct current voltage transformer and a standard direct current voltage transformer, and simultaneously recording the error of the tested direct current transformer by an error measuring device;

and step SS5, finishing the test and removing the test connection.

As shown in fig. 5, the present application also discloses a method for implementing field voltage boosting verification of an ultra-high voltage dc voltage transformer by using the field verification power supply device for an ultra-high voltage dc voltage transformer, which is characterized by comprising the following steps:

step SS1, grounding a control power supply, a transformer, a lower-level voltage-multiplying generator, a standard direct-current voltage transformer and a tested direct-current transformer;

step SS2, connecting the input end of the control power supply with the field power supply, connecting the output end of the control power supply with the input end of the transformer, connecting the output end of the transformer with the next-stage voltage-multiplying generator, and connecting the input end of the next-stage voltage-multiplying generator with the tested direct-current voltage transformer and the standard direct-current voltage transformer by using no-corona wires;

step SS3, finishing secondary wiring of the extra-high voltage direct-current voltage transformer test;

step SS4, adjusting a control power supply, generating voltages of 40kV, 80kV, 250kV, 400kV and 500kV through a lower-level voltage multiplier after generating medium voltage through a transformer, providing test voltages for a tested direct-current voltage transformer and a standard direct-current voltage transformer, and recording the error of the tested direct-current transformer by an error measuring device;

and step SS5, finishing the test and removing the test connection.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.