阅读说明：本技术 一种标准三相组合互感器 (Standard three-phase combined mutual inductor ) 是由 林聪� 曹敏 何兆磊 朱梦梦 刘清蝉 程富勇 熊峻 赵静 孙军 贾芳艳 于 2020-12-07 设计创作，主要内容包括：本发明涉及一种标准三相组合互感器,属于电能计量技术领域。本发明包括壳体、高压大电流接线柱、三相升压单元、三相高压升流单元、三相高压电流标准单元、三相电压标准单元、低压接线排、绝缘介质、自锁万向轮以及线缆,其中三相升压单元、三相高压升流单元、三相高压电流标准单元、三相电压标准单元安装于壳体内部,高压大电流接线柱安装于壳体顶部、低压接线排安装于壳体侧面。本发明将组合互感器校验用升压电源、高压升流电源、标准电流互感器以及标准电压互感器一体化设计,最大程度减小试验设备及试验接线数量,提高组合互感器误差试验的容错性,降低试验难度,提高试验效率。(The invention relates to a standard three-phase combined transformer, and belongs to the technical field of electric energy metering. The invention comprises a shell, a high-voltage large-current binding post, a three-phase boosting unit, a three-phase high-voltage current standard unit, a three-phase voltage standard unit, a low-voltage wiring bar, an insulating medium, a self-locking universal wheel and a cable, wherein the three-phase boosting unit, the three-phase high-voltage current standard unit and the three-phase voltage standard unit are arranged in the shell, the high-voltage large-current binding post is arranged at the top of the. According to the invention, the boosting power supply for checking the combined transformer, the high-voltage boosting power supply, the standard current transformer and the standard voltage transformer are integrally designed, so that the number of test equipment and test wiring is reduced to the greatest extent, the fault tolerance of the error test of the combined transformer is improved, the test difficulty is reduced, and the test efficiency is improved.)

1. The standard three-phase combined mutual inductor is characterized in that: the device comprises a shell, a high-voltage large-current wiring terminal, a three-phase boosting unit, a three-phase high-voltage current standard unit, a three-phase voltage standard unit, a low-voltage wiring bar, an insulating medium, a self-locking universal wheel and a cable;

the three-phase boosting unit, the three-phase high-voltage current standard unit and the three-phase voltage standard unit are arranged inside the shell, the high-voltage large-current wiring terminal is arranged at the top of the shell, and the low-voltage wiring bar is arranged on the side face of the shell.

2. The standard three-phase combination transformer of claim 1, wherein: the three-phase high-voltage current rising unit consists of three high-voltage current rising sources, the three high-voltage current rising sources are A, B, C three phases, a current output winding of each current rising source can bear 42kV high voltage, the A, B, C three-phase current rising source comprises an input winding, an output winding, an iron core and a support 1, a primary winding and a secondary winding are uniformly wound on the iron core, and the iron core is fixed at the bottom of the shell through the support 1.

3. The standard three-phase combination transformer of claim 1, wherein: the three-phase high-voltage current standard unit consists of three high-voltage current standards which are A, B, C three phases, each current standard consists of a primary winding, a secondary winding, an iron core and a bracket 2, wherein the primary winding comprises n taps including L1, L2, L3 and L4.. once.n.Ln, the secondary winding comprises m taps including K1-Km, the primary winding and the secondary winding are uniformly wound on the iron core, and the iron core is fixed at the bottom of the shell through the bracket 2;

the iron cores of the three-phase current rising unit and the three-phase high-voltage current standard unit are both annular iron cores, and the iron cores of each phase current rising unit and the high-voltage current standard unit are both arranged on the bracket 1 of three high-voltage current rising sources and the bracket 2 of high-voltage current standard in the three-phase high-voltage current rising unit with the same annular core;

and the output winding of the A, B, C phase current rising source is respectively connected with the A, B, C three-phase current standard primary winding in series to provide test current for the three-phase current standard.

4. The standard three-phase combination transformer of claim 1, wherein: the three-phase boosting unit consists of three boosting sources, the three boosting sources are divided into A, B, C three phases, the maximum output voltage of each boosting source is 42kV, and the A, B, C three-phase boosting source comprises an input winding, an output winding, an iron core and a bracket 3; the primary winding and the secondary winding are uniformly wound on the iron core, and the iron core is fixed at the bottom of the shell through the bracket 3.

5. The standard three-phase combination transformer of claim 1, wherein: the three-phase voltage standard unit comprises three voltage standards which are A, B, C three phases, each voltage standard comprises a primary winding, a secondary winding, an iron core and a bracket 4, the primary winding is P1-P2, and the secondary winding comprises K taps which are S1-Sk in total; wherein P1 of the primary winding is a high-voltage end; the voltage standard comprises k-1 transformation ratios; the iron core of the three-phase voltage standard unit is an R-shaped iron core, wherein a secondary winding is tightly and uniformly wound on the iron core, a primary winding is tightly and uniformly wound on the secondary winding, the primary winding, the secondary winding and the iron core form a coil of the voltage standard unit, the last turn of the primary winding is connected with an electric shielding film, the electric shielding film and the coil are equal in width, and the coil is completely wrapped so as to realize electric shielding of the coil;

the electric shielding film is made of a copper foil material;

the iron core is fixed with the bottom of the shell through a bracket 4; the height of the bracket 1 and the height of the bracket 2 are higher than that of the voltage standard unit, and the current rising unit, the high-voltage current standard unit and the voltage standard unit are designed in a staggered mode, so that mutual magnetic field interference is greatly reduced; A. the output winding of the B, C phase boosting source is respectively connected with the high-voltage end of the A, B, C voltage standard primary winding to provide test voltage for the three-phase voltage standard;

the P1 end of the primary winding of the A, B, C-phase three-phase voltage standard unit is connected with the L1 end of the primary winding of the A, B, C-phase current standard unit respectively, and test high voltage is provided for the three-phase current standard unit.

6. The standard three-phase combination transformer of claim 1, wherein: the high-voltage large-current binding post comprises A, B, C three groups of 3n +1 binding posts;

AL1, AL2, AL3, AL4.... ann. ALn, BL1, BL2, BL3, bl4.... ann. BLn, CL1, CL2, CL3, cl4.. ann. CLn, and N, respectively;

the low-voltage end P2 of the primary winding of the A, B, C-phase three-phase voltage standard unit is connected with a high-voltage large-current wiring terminal N;

the high-voltage high-current wiring terminals AL1, AL2, AL3, AL4 and L.9.. ALn are respectively connected with primary windings L1, L2, L3 and L4.. 9. Ln with standard A-phase current; the high-voltage large-current terminals BL1, BL2, BL3 and BL4.. An BLn are respectively connected with primary windings L1, L2, L3 and L4.. An Ln with standard B-phase current; the high-voltage large-current terminals CL1, CL2, CL3 and cl4.

7. The standard three-phase combination transformer of claim 1, wherein: the low-voltage wiring bar is made of epoxy materials, and comprises 4 parts, namely a three-phase boosting source input terminal, a three-phase voltage standard secondary terminal, a three-phase current standard secondary terminal and a grounding terminal;

wherein three-phase boost source input terminal includes Au, Bu, Cu, Nu, and three-phase boost source input terminal includes Al, Bl, Cl, Nl, and three-phase voltage standard secondary terminal includes: A. b, C three groups of 3k binding posts, namely A (S1-Sk), B (S1-Sk) and C (S1-Sk); the three-phase current standard secondary terminal comprises: A. b, C three groups of 3m binding posts, which are respectively A (K1-Km), B (K1-Km) and C (K1-Km)

The input winding of the three-phase boosting unit is respectively connected with three-phase boosting source input terminals Au, Bu, Cu and Nu of the low-voltage wiring bar in the shell; the input winding of the three-phase high-voltage current rising unit is respectively connected with three-phase current rising source input terminals Al, Bl, Cl and Nl of the low-voltage wiring bank in the shell; the three-phase standard voltage unit secondary winding is respectively connected with three-phase voltage standard secondary terminals A (S1-Sk), B (S1-Sk) and C (S1-Sk) of the low-voltage wiring bank in the shell; the secondary windings of the three-phase high-voltage standard unit are respectively connected with three-phase current standard secondary terminals A (K1-Km), B (K1-Km) and C (K1-Km) of the low-voltage wiring bank in the shell.

8. The standard three-phase combination transformer of claim 1, wherein: the shell of the standard three-phase combined mutual inductor is of a cuboid structure, the sectional area of the top surface is larger than that of the bottom surface, and four L-shaped lifting lugs are arranged at four corners of the top surface, so that the standard three-phase combined mutual inductor is convenient to move and transport.

9. The standard three-phase combination transformer of claim 1, wherein: the self-locking universal wheels of the standard three-phase combined mutual inductor are arranged at four corners of the bottom of the shell, so that the standard three-phase combined mutual inductor is convenient to move and transport.

10. The standard three-phase combination transformer of claim 1, wherein: the insulating medium of the standard three-phase combined transformer is high-purity SF 6.

Technical Field

The invention relates to a standard three-phase combined transformer, and belongs to the technical field of electric energy metering.

Background

The high-voltage three-phase combined mutual inductor is an important component of a high-voltage three-phase electric energy metering device, has the advantages of low cost, small volume, light weight, electricity stealing prevention, resource saving and the like, is widely applied to 10kV to 35kV users, and particularly in rural power networks, because the combined mutual inductor has excellent electricity stealing prevention performance, a large number of high-power and high-count users are provided with a complete set of metering devices taking the three-phase combined mutual inductor as a core.

The three-phase combined transformer is a transformer which is formed by combining a three-phase electromagnetic voltage transformer and three (or two) single-phase electromagnetic current transformers and is used for a three-phase power system, electromagnetic influence exists among the transformers in actual operation, and the actual influence quantity is not subjected to test evaluation in error detection. If only a single-phase test method is adopted to carry out error detection on the single mutual inductor in sequence, the error characteristic of the three-phase combined mutual inductor during actual operation cannot be truly reflected.

JB/T10432-. The verification regulation of JJG 1165-2019 three-phase combined transformer clearly stipulates that a three-phase method is used for measuring the error of a voltage transformer under the condition of applying current (1% -120% of rated current), and the error of the current transformer is measured under the condition of applying voltage (80% -120% of rated voltage). Therefore, the error of the combined transformer needs to be checked by using a three-phase method under the simulated operation condition.

The traditional combined transformer error calibration device based on the three-phase method specified by the calibration regulations comprises three voltage boosters, three high-voltage current boosters, three high-voltage standard current transformers, three standard voltage transformers, a transformer calibrator, a voltage regulation control box and the like. Three boosters and three high-voltage current boosters need to be connected with a voltage regulation control box, three high-voltage standard current transformers need to be connected with three high-voltage current boosters, a tested combined transformer, a current load box and a transformer calibrator, three standard voltage transformers need to be connected with three boosters, a tested combined transformer, a voltage load box and a transformer calibrator, and the three standard voltage transformers relate to more than 20 pieces of test equipment, the test wiring exceeds 50 times, the wiring is complex, the requirements on test personnel are high, errors are prone to occurring, the accuracy of the calibration result is affected if the wiring or the operation is wrong, the test equipment or a tested product can be damaged, and even personal safety risks can be brought.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the invention provides a standard three-phase combined transformer, which integrates a boosting power supply for checking the combined transformer, a high-voltage boosting power supply, a standard current transformer and a standard voltage transformer, reduces the number of test equipment and test wiring to the maximum extent, improves the fault tolerance of an error test of the combined transformer, reduces the test difficulty and improves the test efficiency.

The technical scheme of the invention is as follows: a standard three-phase combined transformer comprises a shell, a high-voltage large-current wiring terminal, a three-phase boosting unit, a three-phase high-voltage current standard unit, a three-phase voltage standard unit, a low-voltage wiring bar, an insulating medium, a self-locking universal wheel and a cable;

the three-phase boosting unit, the three-phase high-voltage current standard unit and the three-phase voltage standard unit are arranged inside the shell, the high-voltage large-current wiring terminal is arranged at the top of the shell, and the low-voltage wiring bar is arranged on the side face of the shell.

As a further scheme of the invention, the three-phase high-voltage current rising unit consists of three high-voltage current rising sources, which are divided into A, B, C three phases, a current output winding of each current rising source can bear 42kV high voltage, the A, B, C three-phase current rising source comprises an input winding, an output winding, an iron core and a bracket 1 (a phase, B phase and C phase), a primary winding and a secondary winding are uniformly wound on the iron core, and the iron core is fixed at the bottom of the shell through the bracket 1.

As a further scheme of the invention, the three-phase high-voltage current standard unit consists of three high-voltage current standards which are divided into A, B, C three phases, each current standard consists of a primary winding, a secondary winding, an iron core and a bracket 2 (a phase, a phase B phase and a phase C), wherein the primary winding comprises n taps including L1, L2, L3 and L4.... Ln, the secondary winding comprises m taps including K1-Km, the primary winding and the secondary winding are uniformly wound on the iron core, and the iron core is fixed at the bottom of the shell through the bracket 2;

the iron cores of the three-phase current rising unit and the three-phase high-voltage current standard unit are both annular iron cores, and the iron cores of each phase current rising unit and the high-voltage current standard unit are both arranged on the bracket 1 of three high-voltage current rising sources and the bracket 2 of high-voltage current standard in the three-phase high-voltage current rising unit with the same annular core;

and the output winding of the A, B, C phase current rising source is respectively connected with the A, B, C three-phase current standard primary winding in series to provide test current for the three-phase current standard.

As a further scheme of the invention, the three-phase boosting unit consists of three boosting sources, which are divided into A, B, C three phases, the maximum output voltage of each boosting source is 42kV, and the A, B, C three-phase boosting source comprises an input winding, an output winding, an iron core and a bracket 3 (a phase, a phase B phase and a phase C); the primary winding and the secondary winding are uniformly wound on the iron core, and the iron core is fixed at the bottom of the shell through the bracket 3.

As a further scheme of the invention, the three-phase voltage standard unit consists of three voltage standards, which are divided into A, B, C three phases, each voltage standard consists of a primary winding, a secondary winding, an iron core and a bracket 4 (phase A, phase B and phase C), the primary winding is P1-P2, and the primary winding comprises K taps from S1 to Sk; wherein P1 of the primary winding is a high-voltage end; the voltage standard comprises k-1 transformation ratios; the iron core of the three-phase voltage standard unit is an R-shaped iron core, wherein a secondary winding is tightly and uniformly wound on the iron core, a primary winding is tightly and uniformly wound on the secondary winding, the primary winding, the secondary winding and the iron core form a coil of the voltage standard unit, the last turn of the primary winding is connected with an electric shielding film, the electric shielding film and the coil are equal in width, and the coil is completely wrapped so as to realize electric shielding of the coil;

the electric shielding film is made of a copper foil material;

the iron core is fixed with the bottom of the shell through a bracket 4; the height of the bracket 1 and the height of the bracket 2 are higher than that of the voltage standard unit, and the current rising unit, the high-voltage current standard unit and the voltage standard unit are designed in a staggered mode, so that mutual magnetic field interference is greatly reduced;

the output winding of the A, B, C phase boosting source is respectively connected with the high-voltage end of the A, B, C voltage standard primary winding to provide test voltage for the three-phase voltage standard;

the P1 end of the primary winding of the A, B, C-phase three-phase voltage standard unit is connected with the L1 end of the primary winding of the A, B, C-phase current standard unit respectively, and test high voltage is provided for the three-phase current standard unit.

As a further aspect of the invention, the high voltage high current terminals include A, B, C three sets of 3n +1 terminals,

AL1, AL2, AL3, AL4.... ann. ALn, BL1, BL2, BL3, bl4.... ann. BLn, CL1, CL2, CL3, cl4.. ann. CLn, and N, respectively;

the low-voltage end P2 of the primary winding of the A, B, C-phase three-phase voltage standard unit is connected with a high-voltage large-current wiring terminal N;

the high-voltage high-current wiring terminals AL1, AL2, AL3, AL4 and L.9.. ALn are respectively connected with primary windings L1, L2, L3 and L4.. 9. Ln with standard A-phase current; the high-voltage large-current terminals BL1, BL2, BL3 and BL4.. An BLn are respectively connected with primary windings L1, L2, L3 and L4.. An Ln with standard B-phase current; the high-voltage large-current terminals CL1, CL2, CL3 and cl4.

As a further scheme of the invention, the low-voltage wiring bar is made of epoxy material, and comprises 4 parts, namely a three-phase boosting source input terminal, a three-phase voltage standard secondary terminal, a three-phase current standard secondary terminal and a grounding terminal;

wherein three-phase boost source input terminal includes Au, Bu, Cu, Nu, and three-phase boost source input terminal includes Al, Bl, Cl, Nl, and three-phase voltage standard secondary terminal includes: A. b, C three groups of 3k binding posts, namely A (S1-Sk), B (S1-Sk) and C (S1-Sk); the three-phase current standard secondary terminal comprises: A. b, C three groups of 3m binding posts, which are respectively A (K1-Km), B (K1-Km) and C (K1-Km)

The input winding of the three-phase boosting unit is respectively connected with three-phase boosting source input terminals Au, Bu, Cu and Nu of the low-voltage wiring bar in the shell; the input winding of the three-phase high-voltage current rising unit is respectively connected with three-phase current rising source input terminals Al, Bl, Cl and Nl of the low-voltage wiring bank in the shell; the three-phase standard voltage unit secondary winding is respectively connected with three-phase voltage standard secondary terminals A (S1-Sk), B (S1-Sk) and C (S1-Sk) of the low-voltage wiring bank in the shell; the secondary windings of the three-phase high-voltage standard unit are respectively connected with three-phase current standard secondary terminals A (K1-Km), B (K1-Km) and C (K1-Km) of the low-voltage wiring bank in the shell.

As a further scheme of the invention, a shell of the standard three-phase combined transformer is of a cuboid structure, the sectional area of the top surface is larger than that of the bottom surface, and four corners of the top surface are provided with four L-shaped lifting lugs, so that the standard three-phase combined transformer is convenient to move and transport;

as a further scheme of the invention, the self-locking universal wheels of the standard three-phase combined mutual inductor are arranged at four corners of the bottom of the shell, so that the standard three-phase combined mutual inductor is convenient to move and transport.

As a further aspect of the present invention, the insulating medium of the aforementioned standard three-phase combined transformer is high-purity SF 6.

The invention has the beneficial effects that: the invention integrates and integrates 12 pieces of test equipment for error checking of the combined transformer to form a standard three-phase combined transformer, and has the following advantages and positive effects:

(1) the number of test devices is reduced: the test equipment for boosting, increasing current and providing standard signals is changed from 12 pieces to 1 piece, so that the test site requirement, the test workload and the test difficulty are greatly reduced;

(2) reduce experimental wiring quantity: the test wiring is reduced by more than half, so that the test workload and difficulty are reduced;

(3) reduction of test uncertainty: the booster, the current standard and the voltage standard are fixed in position, and the mutual interference amount is fixed, so that the relative distance between devices and the uncertainty caused by wiring are reduced, and the accuracy of the test is improved;

(4) the fault tolerance of the test is improved: on the basis of reducing test wiring and test equipment, the wiring of other equipment of the standard three-phase combined transformer and combined transformer error checking system is clearly marked in a wiring row, so that the working difficulty of testers is greatly reduced, the probability of wrong wiring or missed wiring is reduced, and the test fault-tolerant rate is improved;

(5) miniaturization, light weight, mobile design: the insulating medium adopts high-purity SF6 to design lug and universal wheel, small, light in weight and be convenient for remove.

Drawings

FIG. 1 is a functional block diagram of the present invention;

FIG. 2 is a schematic view of a high-voltage high-current terminal block panel according to the present invention

FIG. 3 is a schematic view of a low voltage patch panel of the present invention;

FIG. 4 is a diagram of a single-pass wiring for error checking of the combined transformer checking system of the present invention, wherein the largest dashed box is the present invention;

fig. 5 is a secondary wiring for error checking of the combined transformer checking system of the invention.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

Example 1: as shown in fig. 1-5, a standard three-phase combined transformer includes a housing, a high-voltage large-current binding post, a three-phase boosting unit, a three-phase high-voltage standard unit, a three-phase voltage standard unit, a low-voltage binding post, an insulating medium, a self-locking universal wheel and a cable;

the three-phase boosting unit, the three-phase high-voltage current standard unit and the three-phase voltage standard unit are arranged in the shell, the high-voltage heavy-current wiring terminal is arranged at the top of the shell, and the low-voltage wiring bar is arranged on the side surface of the shell;

the three-phase high-voltage current rising unit consists of three high-voltage current rising sources, the three high-voltage current rising sources are A, B, C three phases, a current output winding of each current rising source can bear 42kV high voltage, the A, B, C three-phase current rising source comprises an input winding, an output winding, an iron core and a bracket 1, a primary winding and a secondary winding are uniformly wound on the iron core, and the iron core is fixed at the bottom of the shell through the bracket 1;

the three-phase high-voltage current standard unit consists of three high-voltage current standards which are divided into A, B, C three phases, each current standard consists of a primary winding, a secondary winding, an iron core and a bracket 2, the primary winding comprises three taps of L1, L2 and L3, the secondary winding comprises 10 taps from K1 to K10, the primary winding and the secondary winding are uniformly wound on the iron core, and the iron core is fixed at the bottom of the shell through the bracket 2;

the iron cores of the three-phase current rising unit and the three-phase high-voltage current standard unit are both annular iron cores, and the iron cores of each phase current rising unit and the high-voltage current standard unit are both arranged on the bracket 1 of three high-voltage current rising sources and the bracket 2 of high-voltage current standard in the three-phase high-voltage current rising unit with the same annular core;

the output winding of the A, B, C phase current rising source is respectively connected with the A, B, C three-phase current standard primary winding in series to provide test current for the three-phase current standard;

the three-phase boosting unit consists of three boosting sources, the three boosting sources are divided into A, B, C three phases, the maximum output voltage of each boosting source is 42kV, and the A, B, C three-phase boosting source comprises an input winding, an output winding, an iron core and a bracket 3; the primary winding and the secondary winding are uniformly wound on the iron core, and the iron core is fixed at the bottom of the shell through a bracket 3;

the three-phase voltage standard unit comprises three voltage standards which are A, B, C three phases, each voltage standard comprises a primary winding, a secondary winding, an iron core and a bracket 4, the primary winding is P1-P2, and the secondary winding comprises 3 taps from S1 to S4; wherein P1 of the primary winding is a high-voltage end;

the voltage standard comprises、、、、Six transformation ratios; the iron core of the three-phase voltage standard unit is an R-shaped iron core, wherein a secondary winding is tightly and uniformly wound on the iron core, a primary winding is tightly and uniformly wound on the secondary winding, the primary winding, the secondary winding and the iron core form a coil of the voltage standard unit, the last turn of the primary winding is connected with an electric shielding film, the electric shielding film and the coil are equal in width, and the coil is completely wrapped so as to realize electric shielding of the coil;

the electric shielding film is made of a copper foil material;

the iron core is fixed with the bottom of the shell through a bracket 4; the height of the bracket 1 and the height of the bracket 2 are higher than that of the voltage standard unit, and the current rising unit, the high-voltage current standard unit and the voltage standard unit are designed in a staggered mode, so that mutual magnetic field interference is greatly reduced; A. the output winding of the B, C phase boosting source is respectively connected with the high-voltage end of the A, B, C voltage standard primary winding to provide test voltage for the three-phase voltage standard;

the P1 end of the primary winding of the A, B, C-phase three-phase voltage standard unit is connected with the L1 end of the primary winding of the A, B, C-phase current standard unit respectively, and test high voltage is provided for the three-phase current standard unit.

As a further aspect of the present invention, as shown in fig. 2, the high-voltage large-current terminal includes A, B, C three groups of 16 terminals, which are AL1, AL2, AL3, AL4, AL5, BL1, BL2, BL3, BL4, BL5, CL1, CL2, CL3, CL4, CL5 and N;

and the low-voltage end P2 of the primary winding of the A, B, C-phase three-phase voltage standard unit is connected with a high-voltage large-current wiring terminal N.

The high-voltage large-current wiring terminals AL1, AL2, AL3, AL4 and AL5 are respectively connected with primary windings L1, L2, L3, L4 and L5 of the A-phase current standard; the high-voltage large-current terminals BL1, BL2, BL3, BL4 and BL5 are respectively connected with primary windings L1, L2, L3, L4 and L5 of the B-phase current standard; high-voltage large-current terminals CL1, CL2, CL3, CL4 and CL5 are respectively connected with primary windings L1, L2, L3, L4 and L5 of the C-phase current standard.

As a further aspect of the present invention, as shown in fig. 3, the low voltage wiring bar comprises 4 parts, and the low voltage wiring bar is made of epoxy material, and is respectively a three-phase boost voltage source input terminal, a three-phase boost current source input terminal, a three-phase voltage standard secondary terminal, a three-phase current standard secondary terminal and a ground terminal;

wherein three-phase boost source input terminal includes Au, Bu, Cu, Nu, and three-phase boost source input terminal includes Al, Bl, Cl, Nl, and three-phase voltage standard secondary terminal includes: A. b, C three groups of 12 binding posts, namely A (S1-S4), B (S1-S4) and C (S1-S4); the three-phase current standard secondary terminal comprises: a. B, C three groups of 33 binding posts, namely A (K1-K11), B (K1-K11) and C (K1-K11);

the input winding of the three-phase boosting unit is respectively connected with three-phase boosting source input terminals Au, Bu, Cu and Nu of the low-voltage wiring bar in the shell; the input winding of the three-phase high-voltage current rising unit is respectively connected with three-phase current rising source input terminals Al, Bl, Cl and Nl of the low-voltage wiring bank in the shell; the three-phase standard voltage unit output winding is respectively connected with three-phase voltage standard secondary terminals A (S1-S4), B (S1-S4) and C (S1-S4) of the low-voltage wiring bar in the shell; the output windings of the three-phase high-voltage current standard units are respectively connected with three-phase current standard secondary terminals A (K1-K11), B (K1-K11) and C (K1-K11) of the low-voltage wiring bar in the shell.

As a further scheme of the invention, a shell of the standard three-phase combined transformer is of a cuboid structure, the sectional area of the top surface is larger than that of the bottom surface, and four corners of the top surface are provided with four L-shaped lifting lugs, so that the standard three-phase combined transformer is convenient to move and transport;

as a further scheme of the invention, the self-locking universal wheels of the standard three-phase combined mutual inductor are arranged at four corners of the bottom of the shell, so that the standard three-phase combined mutual inductor is convenient to move and transport.

As a further aspect of the present invention, the insulating medium of the aforementioned standard three-phase combined transformer is high-purity SF 6.

The working principle of the invention is as follows:

the principle diagram of the invention is shown in fig. 1, a three-phase high-voltage current rising unit consists of three high-voltage current rising sources, which are A, B, C three-phase, and A, B, C three-phase current rising sources comprise an input winding and an output winding; the three-phase current standard unit consists of three high-voltage current standards which are divided into A, B, C three phases, each current standard consists of a primary winding, a secondary winding and an iron core, the primary winding comprises 4 taps including L1, L2, L3, L4 and L5, and the secondary winding comprises 10 taps including K1-K11; a. An output winding of the B, C phase current rising source is respectively connected with a A, B, C three-phase current standard primary winding in series to provide test current for the three-phase current standard; the three-phase boosting unit consists of three boosting sources, the three boosting sources are divided into A, B, C three phases, the maximum output voltage of each boosting source is 42kV, and the A, B, C three-phase boosting source comprises an input winding and an output winding; the three-phase voltage standard unit consists of three voltage standards which are A, B, C three phases, each voltage standard consists of a primary winding, a secondary winding and an iron core, the primary winding is P1-P2, and the secondary winding comprises 3 taps in total from S1 to S4; wherein P1 of the primary winding is a high-voltage end; A. the output windings of the B, C phase boosting sources are respectively connected with the A, B, C voltage standard primary winding in parallel, so as to provide test voltage for the three-phase voltage standard; A. the P1 end of the primary winding of the B, C-phase three-phase voltage standard unit is respectively connected with the L1 end of the primary winding of the A, B, C-phase current standard unit, so that test high voltage is provided for the three-phase current standard unit; the high-voltage large-current binding post comprises A, B, C three groups of 16 binding posts, namely AL1, AL2, AL3, AL4, AL5, BL1, BL2, BL3, BL4, BL5, CL1, CL2, CL3, CL4, CL5 and N; the high-voltage large-current wiring terminals AL1, AL2, AL3, AL4 and AL5 are respectively connected with primary windings L1, L2, L3, L4 and L5 of the A-phase current standard; the high-voltage large-current terminals BL1, BL2, BL3, BL4 and BL5 are respectively connected with primary windings L1, L2, L3, L4 and L5 of the B-phase current standard; the high-voltage large-current terminals CL1, CL2, CL3, CL4 and CL5 are respectively connected with primary windings L1, L2, L3, L4 and L5 with the standard C-phase current, and N is a common terminal. The low-voltage wiring bar comprises 4 parts, namely a three-phase boosting source input terminal, a three-phase voltage standard secondary terminal, a three-phase current standard secondary terminal and a grounding terminal; wherein three-phase boost unit input terminal includes Au, Bu, Cu, Nu, and three-phase boost source input terminal includes Al, Bl, Cl, Nl, and three-phase voltage standard secondary terminal includes: A. b, C three groups of 12 binding posts, namely A (S1-S4), B (S1-S4) and C (S1-S4); the three-phase current standard secondary terminal comprises: a. B, C three groups of 33 binding posts, namely A (K1-K11), B (K1-K11) and C (K1-K11); the input winding of the three-phase boosting unit is respectively connected with three-phase boosting source input terminals Au, Bu, Cu and Nu of the low-voltage wiring bar in the shell; the input winding of the three-phase high-voltage current rising unit is respectively connected with three-phase current rising source input terminals Al, Bl, Cl and Nl of the low-voltage wiring bank in the shell; the three-phase standard voltage unit secondary winding is respectively connected with three-phase voltage standard secondary terminals A (S1-S4), B (S1-S4) and C (S1-S4) of the low-voltage wiring bar in the shell; the three-phase standard current unit secondary winding is connected with three-phase current standard secondary terminals A (K1-K11), B (K1-K11) and C (K1-K11) of the low-voltage wiring bar respectively in the shell.

A primary wiring diagram of the test is shown in fig. 4, and a booster and a current booster of the invention are connected with a three-phase voltage regulator in a combined transformer calibration system through a switching row; the primary ends of the high-voltage multi-transformation-ratio current standard and the multi-transformation-ratio voltage standard of the invention are connected with a tested combined transformer through a high-voltage large-current wiring terminal; fig. 5 shows a secondary wiring of a test, and the high-voltage multi-transformation-ratio current standard and multi-transformation-ratio voltage standard secondary windings of the invention are connected with a three-phase calibrator and a secondary winding of a tested combined transformer through a low-voltage wiring bar. The voltage output is controlled by a three-phase voltage regulator in the combined transformer calibration system, and the invention is utilized to provide a tested combined transformer with a test high voltage, a test large current, a standard voltage and a standard current signal, so that the combined transformer works at a calibration point specified by a regulation, and the error of the combined transformer is read by the three-phase transformer calibration instrument, thus completing the test. The wiring quantity is few, simple, easily the operation has promoted combined transformer's test efficiency, accuracy and security by a wide margin.

The device integrated level is high, small, light in weight, convenient removal operation, can realize three mutual-inductor errors that combine together, variation, voltage current influence volume are experimental, still can be used to three voltage mutual-inductors, three (or two) current mutual-inductor's error check-up simultaneously, has reduced the quantity of test equipment and experimental wiring by a wide margin, has improved experimental efficiency, fault-tolerant rate and security, has still reduced experimental uncertainty, has improved experimental accuracy.

While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes and modifications can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.