CN113506676B - Partial discharge-free self-boosting multi-transformation-ratio standard voltage transformer and test method - Google Patents
Partial discharge-free self-boosting multi-transformation-ratio standard voltage transformer and test method Download PDFInfo
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- CN113506676B CN113506676B CN202110667916.2A CN202110667916A CN113506676B CN 113506676 B CN113506676 B CN 113506676B CN 202110667916 A CN202110667916 A CN 202110667916A CN 113506676 B CN113506676 B CN 113506676B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase AC
- H01F38/34—Combined voltage and current transformers
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Abstract
The invention discloses a non-partial discharge self-boosting multi-transformation-ratio standard voltage transformer and a test method, and relates to the technical field of electric energy metering. With the integrated design of booster and standard voltage transformer, this voltage transformer includes the booster solenoid, the etalon solenoid and compensates the solenoid, can be used to realize 6kV, 10kV, 20kV, the voltage transformer error measurement and the partial discharge of the total 8 transformation ratios of four voltage classes of 35kV, withstand voltage test, the quantity of mutual-inductor test device test equipment has been reduced, the degree of accuracy grade of guaranteeing 8 transformation ratios all reaches 0.01 level, and etalon and booster self partial discharge is less than 5pC, guarantee multinomial experimental high efficiency, the accurate implementation.
Description
Technical Field
The invention relates to the technical field of electric energy metering, in particular to a non-partial discharge self-boosting multi-transformation-ratio standard voltage transformer and a test method.
Background
The voltage transformer is an important component of an electric energy metering device, is a source of a voltage signal of the electric energy meter, plays an important role in electric power trade settlement of a power grid due to accuracy, must be forcibly verified according to a metrological verification rule, and needs to perform full-performance detection of the voltage transformer for quality control of products, including test items such as withstand voltage and partial discharge. The calibration and the full-performance detection of the voltage transformer need equipment such as a boosting power supply, a standard voltage transformer, an error measuring device and the like, wherein the measurement accuracy and the stability of the standard voltage transformer directly influence the calibration result of the voltage transformer, so the calibration error of the voltage transformer has higher requirements on the accuracy, the stability and the like of the standard.
The distribution network voltage transformer mainly comprises four voltage levels of 6kV, 10kV, 20kV and 35kV, and 6kV/100V,
10kV/100V、
35kV/100V、
The transformer comprises 8 transformation ratios of a standard voltage transformer and a boosting power supply.
In order to reduce the number of test equipment and improve the efficiency of the voltage transformer full performance test, a unit proposes a centralized design of the test equipment for each performance test of the voltage transformer, and if the power frequency withstand voltage test, the induction withstand voltage test, the partial discharge test and the error test equipment are required to be integrated into an integrated design, the core problem required to overcome is a booster and a standard voltage transformer which meet the test requirements. Adopt integrated design like booster and standard voltage transformer, influenced by electromagnetic interference, standard voltage transformer's accuracy is difficult to ensure, adopts the separation design like booster and standard voltage transformer, and experimental wiring is complicated, and equipment is bulky, the quality is heavy, and test system builds complicacy, and work efficiency is low.
Carrying out error integration tests of four voltage transformers of 6kV, 10kV, 20kV and 35kV, wherein the standard voltage transformers comprise a voltage transformer of 6kV/100V,
10kV/100V、
35kV/100V、
The total number of the transformation ratios is 8, and the 8 transformation ratios can meet the accuracy requirement of 0.02 and above and can boost the voltage to 42kV. Because the transformation ratio quantity is large, 8 transformation ratios share a primary winding, the number of turns of a primary winding with a small transformation ratio and the number of turns of a primary winding with a large transformation ratio need to be shared, the resistance and the leakage reactance of the primary winding and the secondary winding of the standard voltage transformer are increased, errors are increased, the design difficulty is high, and a multi-transformation ratio standard voltage transformer meeting the conditions is not found for a while.
Partial discharge and voltage withstand tests of four voltage level voltage transformers of 6kV, 10kV, 20kV and 35kV are carried out, the booster is required to be capable of boosting to 95kV, if the booster and a standard voltage transformer are integrally designed, the standard voltage transformer also meets the 95kV insulation requirement, and compared with the 42kV insulation requirement for error tests, the withstand voltage of the standard voltage transformer is improved by more than 2 times, the number of turns of a primary winding and the number of turns of a secondary winding of the standard transformer are improved, the resistance and the leakage reactance are further increased, and the standard voltage transformer is required to be in the state of
Under the voltage, the requirement of accuracy of 0.02 grade and above is met. Because of standard voltage transformer actual work is under the condition of low magnetic density, minimum voltage operating voltage is only seven thousandths of the highest operating voltage of 95kV, the design degree of difficulty is promoted than solitary standard voltage transformer by a wide margin to with booster and standard voltage transformer integrated design, the booster will produce strong magnetic field interference to standard voltage transformer, along with the increase of load, the interference increase has further increased standard voltage transformer's the design degree of difficulty, the self-boosting multiple transformation ratio standard voltage who meets this condition is not seen temporarilyProvided is a mutual inductor. The partial discharge test of the voltage transformer is carried out, strict requirements are provided for the partial discharge quantity of the test environment, wherein a booster of the test equipment is a main environment partial discharge producer, the test requirement environmental partial discharge quantity is less than 20pC to the maximum extent, and a self-boosting integrated standard voltage transformer device meeting the test partial discharge requirement is not found at present.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a non-partial discharge self-boosting multi-transformation-ratio standard voltage transformer and a test method, wherein a booster and the multi-transformation-ratio high-precision standard voltage transformer are integrally designed, and the insulation meets the 95kV requirement, 6kV/100V,
10kV/100V、
35kV/100V、
The error meets the requirement of 0.01 grade under 8 transformation ratios, the local discharge amount per se is less than 5pC, the requirement of the local discharge test is met, the requirements of the integrated tests of the error, voltage resistance, local discharge and the like of the voltage transformer with four voltage levels of 6kV, 10kV, 20kV and 35kV are met, the number, the weight and the volume of test equipment are reduced to the maximum extent, the complexity of test wiring is reduced, and the test efficiency and the accuracy and the reliability are improved.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a no-partial discharge self-boosting multi-transformation ratio standard voltage transformer comprises a booster coil, a standard device coil and a compensation coil;
the booster coil comprises a boosting input winding, a boosting measurement winding, a boosting output winding and a boosting iron core; the boosting input winding is uniformly wound on the boosting iron core, the boosting measurement winding is uniformly wound on the input winding, and the boosting output winding is uniformly wound on the measurement winding;
the standard wire package comprises a standard iron core, a standard primary winding, a standard multi-tap secondary winding and a compensation wire package; the standard multi-tap secondary winding is uniformly wound on the standard iron core, a plurality of taps are led out, one tap is a head end, the other tap is a tail end, and the standard primary winding is uniformly wound on the standard secondary winding;
the output end of the boosting output winding is connected with the input end of the standard primary winding in parallel;
the compensation coil comprises a compensation winding, a compensation iron core, a compensation primary winding and a plurality of compensation secondary windings, wherein a coil at one end of the compensation winding is wound on the standard iron core, a coil at the other end of the compensation primary winding is connected with a coil at one end of the compensation winding in parallel, the plurality of compensation secondary windings are wound on the compensation iron core, and a coil at the other end of the compensation primary winding is wound on the compensation secondary windings; by compensating 8 transformation ratios of the standard voltage transformer by the compensation coil, the precision of the standard voltage transformer is improved.
The output end of the compensation secondary winding is connected with the output terminal of the secondary terminal box, so that the accuracy grade of 8 transformation ratios reaches 0.01 grade, and the partial discharge is less than 5pC.
Further, the secondary terminal box comprises (35 kV/100V),
(20kV/100V)、
(10kV/100V)、
(6kV/100V)、
0V, a ground terminal, wherein (35 kV/100V) and
share the same terminal, (20 kV/100V) and
share the same terminal, (10 kV/100V) and
share the same terminal, (6 kV/100V) and
share the same terminal;
the first terminal of the compensation secondary winding is connected with the first tap of the standard multi-tap secondary winding, and the second terminal of the compensation secondary winding is led out and connected into a secondary terminal box
An output terminal;
the third terminal of the compensation secondary winding is connected with the second tap of the standard multi-tap secondary winding, and the fourth terminal of the compensation secondary winding is led out and connected into a secondary terminal box
An output terminal;
the fifth terminal of the compensation secondary winding is connected with the third tap of the standard multi-tap secondary winding, and the sixth terminal of the compensation secondary winding is led out and connected into a secondary terminal box
An output terminal;
the seventh terminal of the compensation secondary winding is connected with the fourth tap of the standard multi-tap secondary winding, and the eighth terminal of the compensation secondary winding is led out and connected into a secondary terminal box
And an output terminal.
Furthermore, the mutual inductor also comprises a conducting rod, an outer cylinder, a connecting flange, a secondary terminal box, a voltage-sharing ball, a sleeve, a shielding cylinder and a shielding polar plate; the standard device coil and the compensation coil are arranged in the outer cylinder, the high-voltage end of the boosting output winding is connected with the conductive rod, and the conductive rod penetrates through the sleeve and then is connected with the grading ring;
the booster coil is connected with the conducting rod, the conducting rod penetrates through the center of the sleeve to be connected with the voltage-equalizing ball, primary voltage of a test is led out, a shielding cylinder is further arranged between the conducting rod and the sleeve, an electric field in the sleeve is equalized, and the sleeve is connected with the outer cylinder through a connecting flange. The bushing meets the insulation requirement of 100kV.
In the invention, the basic error of the standard voltage transformer is designed according to the power frequency of 50 Hz. In the invention, the insulation of the booster and the standard voltage transformer is designed according to multiple frequency; wherein the working frequency of the booster is 50 Hz-400 Hz, and the highest voltage can reach 100kV. By the design mode, on the premise of ensuring the insulation requirement, the working voltage of the standard voltage transformer is reduced, so that the impedance and the magnetic leakage of a coil of the standard voltage transformer are reduced, and the precision of the standard voltage transformer is further improved;
furthermore, the outer barrel is of a 7-shaped structure and comprises a horizontal barrel and a vertical barrel, the booster coil is installed on the horizontal barrel, and the standard instrument coil is installed on the vertical barrel; one side of the transverse barrel is connected with the sleeve through a flange; the outer cylinder is filled with 0.3-0.4 MPa SF6 gas to form a GIS gas chamber.
Furthermore, shielding polar plates are arranged below the booster and the standard instrument coil, on the front side, the rear side, the left side and the right side, so that the electric field distribution of the air chambers where the booster and the standard voltage transformer are arranged is uniform and optimized, and the partial discharge of the air chambers of the booster and the standard voltage transformer GIS is reduced; meanwhile, the shielding polar plate prevents the magnetic field of the booster from merging into the solenoid magnetic circuit of the standard voltage transformer, reduces the magnetic field interference of the booster on the standard voltage transformer, and further ensures the precision of the standard voltage transformer
Furthermore, a shielding cylinder is arranged between the conducting rod and the sleeve, so that the electric field distribution in the sleeve is optimized, and the partial discharge in the sleeve is reduced;
furthermore, a support is arranged below the vertical barrel of the outer barrel, so that the ground height of the sleeve is raised, and the ground height of the outer barrel meets the 100kV insulation requirement.
The invention also relates to a test method, which is used for carrying out an error test or a repeatability test or a polarity test of the voltage transformer by using the non-partial discharge self-boosting multi-transformation ratio standard voltage transformer; or partial discharge test and voltage transformer power frequency withstand voltage test.
Compared with the prior art, the invention has the advantages that:
according to the invention, the booster and the standard voltage transformer are integrated into a whole, so that error measurement, withstand voltage test and partial discharge test of the voltage transformer with 8 transformation ratios of 6kV, 10kV, 20kV and 35kV can be simultaneously carried out, the number of test equipment is reduced, the size and complexity of the integrated test device are reduced to the greatest extent, the equipment does not need to be frequently replaced during the test, an R-shaped iron core made of high-magnetic density and low-loss materials is adopted, the magnetic circuit is good, the stability is high, and the accurate reliability performance of the equipment is ensured; the invention designs the basic working error of the standard device according to the power frequency of 50Hz, designs the insulation, impedance and leakage reactance minimization design of the booster and the standard voltage transformer according to the multiple frequency, boosts the voltage by changing the frequency, realizes the optimization design of the electric field and the magnetic field, is provided with the compensation coil, and ensures (35 kV/100V),
(20kV/100V)、
(10kV/100V)、
(6kV/100V)、
Total 8 transformation ratiosThe accuracy grade reaches 0.01 grade, and the partial discharge is less than 5pC. The invention has high integration level and strong functionality, can be used for error test, polarity test and repeatability test of the mutual inductor, can also be used for partial discharge-free boosting test and power frequency voltage withstand boosting test of the voltage mutual inductor, and is very suitable for the miniaturization and integration design of a distribution network voltage mutual inductor verification system or a full-performance test system.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1: the no-partial discharge self-boosting multi-variable high-precision standard voltage transformer structure diagram;
FIG. 2 is a schematic diagram: partial structure diagram of a booster of a non-partial discharge self-boosting multi-variable high-precision standard voltage transformer;
FIG. 3: a booster part schematic diagram of a non-partial discharge self-boosting multi-variable high-precision standard voltage transformer;
FIG. 4 is a schematic view of: a booster schematic;
FIG. 5 is a schematic diagram of a standard voltage transformer;
FIG. 6: a schematic diagram of a compensation coil;
1-a booster coil; 2-standard voltage transformer coil; 3-compensation coil package; 4-a boost input winding; 5-a boost monitoring winding; 6-a boost output winding; 7. a boost iron core; 8-standard primary winding; 9-standard iron core; 10-standard multi-tap secondary winding; 11-a compensation winding; 12-a compensation core; 13-compensating the primary winding; 14-compensating secondary winding S7' -S7"; 15-compensating secondary winding S8' -S8"; 16-compensation secondary winding S9' -S9"; 17-compensating secondary winding S10' -S10"; 18-conducting rod, 19-outer cylinder, 20-support, 21-connecting flange, 22-secondary terminal box, 23-voltage-equalizing ball, 24-sleeve, 25-shielding cylinder and 26-shielding polar plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.
Referring to fig. 1, 2, and 3, the non-partial discharge self-boosting multi-variable-ratio high-precision standard voltage transformer provided in the embodiment of the present invention specifically includes a booster coil 1, a standard device coil 2, a conductive rod 18, an outer cylinder 19, a bracket 20, a connecting flange 21, a secondary terminal box 22, a voltage-sharing ball 23, a sleeve 24, a shielding cylinder 25, and a shielding pole plate 26.
As shown in fig. 1 and 2, the booster package 1, the etalon package 2, and the shield plate 26 are disposed in the outer case 19 filled with SF6A gas; the shielding polar plate is arranged below, front and back, left and right sides of the booster coil and the standard device coil to homogenize an internal electric field, the booster coil is connected with a conductive rod 18, the conductive rod penetrates through the center of the sleeve to be connected with a pressure equalizing ball 23 to lead out a primary voltage for a test, a shielding cylinder is further arranged between the conductive rod and the sleeve to homogenize the internal electric field of the sleeve, and the sleeve is connected with an outer cylinder 19 through a connecting flange 21; the support 20 is installed at the bottom of the outer cylinder to ensure the insulation distance of the high-voltage wire outlet point 23.
As shown in fig. 3 and 4, the booster coil is composed of booster input windings S1 to S2, a rhombus film, booster measurement windings N1 to N2, booster output windings S3 to S4 and a booster iron core 7; the boosting input windings S1-S24 are uniformly wound on the boosting iron core 7, the boosting measurement windings N1-N2 5 are uniformly wound on the input windings, and the boosting output windings S3-S4 are uniformly wound on the measurement windings; all winding layers are insulated by diamond thin films; the highest voltage of the boosting output windings S3-S4 is 42kV, the boosting measurement windings N1-N2 5 output 0-100V voltage, and the boosting measurement windings are connected with a measurement meter for monitoring test voltage.
As shown in fig. 5 and 6, the standard machine coil 3 is composed of a standard iron core 9, a diamond film, standard primary windings S5-S68, standard multi-tap secondary windings S7-S8-S9-S10, and a compensation coil. The standard multi-tap secondary winding S7-S8-S9-S10 is uniformly wound on a standard iron core, taps S7, S8, S9 and S10 are led out, the S10 is a head end, the S7 is a tail end, the standard primary winding S5-S6 is uniformly wound on the standard secondary winding, and all winding layers are insulated by diamond films; the boosting output windings S3-S4 are connected with the standard primary windings S5-S6 in parallel, S3 is connected with S5, and S4 is connected with S6;
the compensation coil consists of a compensation winding 16, a compensation iron core 12, 1 compensation primary winding 11 and 4 compensation secondary windings 14, 15, 16 and 17, wherein the compensation winding K1-K2 only has 1 turn and is wound on the standard iron core 9, the compensation primary windings K3-K4N turn are connected with the compensation winding K1-K2 in parallel, the compensation secondary windings S7 '-S7', the compensation secondary windings S8 '-S8', the compensation secondary windings S9 '-S9' and the compensation secondary windings S10 '-S10' are wound on the compensation iron core 12, and the compensation primary windings K3-K4 are wound on the compensation secondary windings.
The secondary terminal box comprises (35 kV/100V),
(20kV/100V)、
(10kV/100V)、
(6kV/100V)、
0V, ground terminal; the terminal of the compensation secondary winding S7 'is connected with a tap of a standard multi-tap secondary winding S7, and the compensation secondary winding S7' is led out and connected into a secondary terminal box (35 kV/100V),
An output terminal; the terminal S8 'of the compensation secondary winding is connected with a standard multi-tap secondary winding S8 tap, and the compensation secondary winding S8' is led out and connected into a secondary terminal box (20 kV/100V),
An output terminal; the compensation secondary winding S9 'terminal is connected with a standard multi-tap secondary winding S9 tap, and the compensation secondary winding S9' is led out and connected with a secondary terminal box (10 kV/100V),
An output terminal; the terminal of the compensation secondary winding S10 'is connected with a standard multi-tap secondary winding S10 tap, and the compensation secondary winding S10' is led out and connected into a secondary terminal box (6 kV/100V),
The output terminal, S11, is grounded.
Through the connection of the standard secondary winding and the compensation winding, the final output is (35 kV/100V),
(20kV/100V)、
(10kV/100V)、
(6kV/100V)、
8 transformation ratios, the accuracy grade reaches 0.01 grade, and the partial discharge amount of the booster is less than 5pC, so that the booster can be used for boosting in a non-partial discharge test of a voltage transformer.
1. The invention is used for developing an error test or a repeatability test or a polarity test of the voltage transformer:
the invention and the grounding terminal of the tested voltage transformer are grounded, then the boosting input windings S1-S2 of the non-partial discharge self-boosting multi-transformation ratio standard voltage transformer are connected with a voltage regulating power supply, a sleeve is connected with the high-voltage outlet terminal of the tested voltage transformer, the secondary terminal in the secondary terminal box is connected with the transformer calibrator a and the x terminal, the low-voltage end of the secondary terminal in the secondary terminal box is in short circuit with the low-voltage end of the secondary winding of the tested voltage transformer, the high-voltage end of the secondary terminal in the secondary terminal box is connected with the K terminal of the transformer calibrator, and the high-voltage end of the secondary winding of the tested voltage transformer is connected with the D terminal of the transformer calibrator. Thus, the test wiring is completed.
(1) When a voltage transformer error test is carried out, the voltage regulating power supply is controlled to boost, errors at each voltage point are recorded when the voltage rises to 80% rated voltage, 100% rated voltage and 120% rated voltage respectively, then the voltage drops to zero, errors are recorded when the voltage drops to 80% rated voltage and 100% rated voltage respectively, and the test is finished. And if the error value is within the error limit range, the test meets the test requirement.
(2) And carrying out a voltage transformer repeatability test, controlling the voltage-regulating power supply to boost, recording the error when the voltage rises to 100% rated voltage, then reducing the voltage to zero, repeating the operation for 6 times or more, recording the error when the operation is carried out at 100% rated voltage point every time, and calculating the standard deviation of the error value of the test for 6 times, wherein the standard deviation is less than 1 contract-repairing interval and meets the test requirement.
(3) When a voltage transformer polarity test is carried out, the voltage regulating power supply is controlled to be boosted to about 5% of rated voltage, the polarity of the tested voltage transformer is judged and recorded through the transformer calibrator, the voltage is reduced to zero, and the test is finished.
2. The invention is used for developing partial discharge tests and power frequency withstand voltage tests of the voltage transformer:
the invention and the grounding terminal of the tested voltage transformer are grounded, then the boosting input windings S1-S2 of the non-partial discharge self-boosting multi-transformation-ratio standard voltage transformer are connected with a voltage-regulating power supply, the measuring winding of the booster is connected with a universal meter, the partial discharge measuring device is connected with the non-partial discharge self-boosting multi-transformation-ratio standard voltage transformer in parallel, and the sleeve is connected with the high-voltage outlet terminal of the tested voltage transformer. Thus, the test wiring is completed. Controlling the pre-applied voltage specified by the voltage-boosting regulation of the voltage-regulating power supply, keeping the pre-applied voltage for at least 60s, reducing the voltage to enable the voltage to reach 1.2 times of rated voltage of partial discharge measurement voltage, measuring corresponding partial discharge within 30s after winding, and meeting the test requirement when the partial discharge does not exceed 50 pC.
3. The invention is used for developing a power frequency withstand voltage test of the voltage transformer:
the invention and the grounding terminal of the tested voltage transformer are grounded, then the boosting input windings S1-S2 of the non-partial discharge self-boosting multi-transformation ratio standard voltage transformer are connected with a voltage regulating power supply, the measuring winding of the booster is connected with a universal meter, and the sleeve is connected with the high-voltage outlet terminal of the tested voltage transformer, so that the test wiring is completed. And controlling the voltage boosting of the voltage regulating power supply and monitoring the multimeter, and when the voltage is boosted to the specified voltage of the withstand voltage test, if the voltage lasts for 60s, the winding does not discharge to the ground and breaks down, the test meets the requirements.
The previous description is only an example of the present application, and is provided to enable any person skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A test method characterized by: carrying out an error test or a repeatability test or a polarity test or a partial discharge test or a power frequency withstand voltage test of the voltage transformer by using a non-partial discharge self-boosting multi-transformation ratio standard voltage transformer;
the non-partial discharge self-boosting multi-transformation-ratio standard voltage transformer comprises a booster coil, a standard device coil and a compensation coil;
the booster solenoid comprises a boosting input winding, a boosting measurement winding, a boosting output winding and a boosting iron core; the boosting input winding is uniformly wound on the boosting iron core, the boosting measurement winding is uniformly wound on the input winding, and the boosting output winding is uniformly wound on the measurement winding;
the standard device coil comprises a standard iron core, a standard primary winding, a standard multi-tap secondary winding and a compensation coil; the standard multi-tap secondary winding is uniformly wound on the standard iron core, a plurality of taps are led out, one tap is a head end, the other tap is a tail end, and the standard primary winding is uniformly wound on the standard secondary winding;
the output end of the boosting output winding is connected with the input end of the standard primary winding in parallel;
the compensation coil comprises a compensation winding, a compensation iron core, a compensation primary winding and a plurality of compensation secondary windings, wherein a coil at one end of the compensation winding is wound on the standard iron core, a coil at the other end of the compensation primary winding is connected with a coil at one end of the compensation winding in parallel, the plurality of compensation secondary windings are wound on the compensation iron core, and a coil at the other end of the compensation primary winding is wound on the compensation secondary windings;
the output end of the compensation secondary winding is connected with the output terminal of the secondary terminal box, so that the accuracy grade of 8 transformation ratios reaches 0.01 grade, and the partial discharge is less than 5pC;
the secondary terminal box comprises a (35 kV/100V) output terminal,
Output terminal, (20 kV/100V) output terminal,
Output terminal, (10 kV/100V) output terminal,
Output terminal, (6 kV/100V) output terminal,
An output terminal, a 0V output terminal, a ground terminal;
wherein, (35 kV/100V) output terminal and
the output terminal shares the same terminal, (20 kV/100V) output terminal and
the output terminal shares the same terminal, (10 kV/100V) output terminal and
the output terminals share the same terminal, (6 kV/100V) output terminal and
the output terminals share the same terminal;
the first terminal of the compensation secondary winding is connected with the first tap of the standard multi-tap secondary winding, and the second terminal of the compensation secondary winding is led out and connected into a secondary terminal box
An output terminal;
the third terminal of the compensation secondary winding is connected with the second tap of the standard multi-tap secondary winding, and the fourth terminal of the compensation secondary winding is led out and connected into a secondary terminal box
An output terminal;
the fifth terminal of the compensation secondary winding is connected with the third tap of the standard multi-tap secondary winding, and the sixth terminal of the compensation secondary winding is led out and connected into a secondary terminal box
An output terminal;
the seventh end of the compensation secondary windingThe sub-terminal is connected with the fourth tap of the standard multi-tap secondary winding, and the eighth terminal of the compensation secondary winding is led out and connected into a secondary terminal box
And an output terminal.
2. The partial discharge-free self-boosting multi-transformation-ratio standard voltage transformer applicable to the test method of claim 1, which is characterized in that: the mutual inductor also comprises a conducting rod, an outer cylinder, a connecting flange, a secondary terminal box, a voltage-sharing ball, a sleeve, a shielding cylinder and a shielding polar plate; the standard device coil and the compensation coil are arranged in the outer cylinder, the high-voltage end of the boosting output winding is connected with the conductive rod, and the conductive rod penetrates through the sleeve and then is connected with the grading ring;
the booster solenoid is connected with the conductive rod, the conductive rod penetrates through the center of the sleeve to be connected with the voltage-equalizing ball, primary test voltage is led out, a shielding cylinder is further arranged between the conductive rod and the sleeve to equalize an electric field in the sleeve, and the sleeve is connected with the outer cylinder through a connecting flange; the bushing meets the insulation requirement of 100kV.
3. The non-partial discharge self-boosting multi-transformation ratio standard voltage transformer according to claim 2, characterized in that: designing a basic error of a standard voltage transformer according to a power frequency of 50 Hz; the insulation of the booster and the standard voltage transformer is designed according to the multiple frequency rate of 50 Hz; wherein, the working frequency of the booster is 50 Hz-400 Hz, and the highest voltage reaches 100kV.
4. The non-partial discharge self-boosting multi-ratio standard voltage transformer according to claim 3, wherein: the outer barrel is of a 7-shaped structure and consists of a horizontal barrel and a vertical barrel, the booster coil is installed on the horizontal barrel, and the standard instrument coil is installed on the vertical barrel; one side of the transverse barrel is connected with the sleeve through a flange; the outer cylinder is filled with 0.3-0.4 MPa SF6 gas to form a GIS gas chamber.
5. The non-partial discharge self-boosting multi-ratio standard voltage transformer according to claim 2, wherein: and shielding polar plates are arranged below, in front and back, on left and right sides of the booster and the standard device coil.
6. The non-partial discharge self-boosting multi-transformation ratio standard voltage transformer according to claim 2, characterized in that: and a shielding cylinder is arranged between the conducting rod and the sleeve.
7. The non-partial discharge self-boosting multi-transformation ratio standard voltage transformer according to claim 2, characterized in that: and a support is arranged below the vertical barrel of the outer barrel, so that the height of the support and the height of the outer barrel meet the 100kV insulation requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN203338963U (en) * | 2013-06-05 | 2013-12-11 | 国家电网公司 | New integrated high voltage standard voltage transformer |
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| CN107369544B (en) * | 2017-09-04 | 2023-09-15 | 云南电网有限责任公司电力科学研究院 | GIS type self-boosting standard voltage transformer with electromagnetic shielding |
| CN110261808B (en) * | 2019-06-10 | 2024-04-16 | 国网湖南省电力有限公司 | A vehicle-mounted GIS type meter source device |
| CN112505610A (en) * | 2020-12-07 | 2021-03-16 | 云南电网有限责任公司 | Voltage transformer insulation and metering performance integrated test device and method for metering of 35kV and below |
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| CN203338963U (en) * | 2013-06-05 | 2013-12-11 | 国家电网公司 | New integrated high voltage standard voltage transformer |
| CN112735795A (en) * | 2020-12-07 | 2021-04-30 | 云南电网有限责任公司 | Standard three-phase combined mutual inductor |
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