CN211455518U - Two-stage multi-transformation-ratio standard voltage transformer - Google Patents

Abstract

The utility model provides a two-stage multi-transformation-ratio standard voltage transformer in the field of voltage transformers, which comprises an insulating sleeve, an outer shell, an iron core group, a first shielding cover, a second shielding cover, a lead group, a wiring board, a conducting rod, a shielding plate and a wiring box; the lead group is wound on the iron core group; the iron core group is arranged in the first shielding cover; the two shielding plates are respectively arranged at two ends of the iron core group; the iron core group, the lead group, the first shielding cover and the shielding plate are arranged inside the outer shell; the insulating sleeve is arranged at the upper end of the outer shell and communicated with the outer shell, and the second shielding cover is arranged in the insulating sleeve; the wiring board is connected with the insulating sleeve; the conducting rod is arranged in the second shielding cover and is respectively connected with the wiring board and the wire group; the junction box is arranged on the outer side of the outer shell and connected with the lead group. The utility model has the advantages that: the effective voltage range of the voltage transformer measurement is improved, namely the effective voltage range is from 20 percent U while the accuracy is ensured_n‑120％U_nIncreased to 1% U_n‑120％U_n。

Description

A Two-Stage Multi-Ratio Standard Voltage Transformer

technical field

The utility model relates to the field of voltage transformers, in particular to a standard voltage transformer with a two-stage multi-variable ratio.

Background technique

Similar to transformers, voltage transformers are used to transform the voltage on the line. However, the purpose of the transformer to transform the voltage is to transmit electrical energy, and the purpose of the voltage transformer to transform the voltage is to measure the voltage of the line.

According to the verification regulations of the voltage transformer for measurement, when considering the error of the voltage transformer, the transformer used on the line only calibrates the error under 80%~120% of the rated voltage, and the standard transformer used in the laboratory needs to be calibrated 20%~120%. The error under 120% rated voltage, therefore, when calibrating the transformer, it is necessary to select the corresponding standard voltage transformer according to the voltage level of the transformer being calibrated. For example, the calibration of transformers with rated voltage levels of 500kV, 330kV, 220kV, 110kV, 66kV, 35kV, 10kV, etc., requires standard voltage transformers with corresponding rated voltage levels, which cannot be achieved by a standard voltage transformer. Therefore, how to provide a standard voltage transformer with an aspect ratio of high accuracy has become an urgent problem to be solved.

SUMMARY OF THE INVENTION

The technical problem to be solved by the utility model is to provide a standard voltage transformer with two-stage multi-change ratio, which can improve the measurement accuracy of the voltage transformer, and has a wide change _ratio . %Un _is raised to 1% _Un -120% _Un .

The utility model is realized as follows: a two-stage multi-variable ratio standard voltage transformer comprises an insulating sleeve, an outer casing, an iron core group, a first shielding cover, a second shielding cover, and a wire group , a wiring board, a conductive rod, two shielding plates and a junction box; the wire group is wound on the iron core group; the iron core group is arranged in the first shielding cover; the two shielding plates are respectively provided with at both ends of the iron core group; the iron core group, the wire group, the first shielding cover and the shielding plate are all arranged inside the outer casing; the insulating sleeve is arranged at the upper end of the outer casing and communicates with the outer casing, the The second shield is arranged in the insulating sleeve; the lower end of the wiring board is connected to the insulating sleeve; the conductive rod is arranged in the second shield, one end of the conductive rod is connected with the wiring board, and the other end is connected with the wire group connection; the junction box is arranged outside the outer casing and is connected with the wire group.

Further, the iron core group includes an excitation core and a proportional iron core; the wire group includes an excitation winding, a primary proportional winding, and a secondary proportional winding; the excitation winding is wound on the excitation core The primary proportional winding is wound on the excitation core and the proportional iron core; the secondary proportional winding is wound on the excitation core and the proportional iron core, and is connected with the junction box.

Further, the excitation magnet core is an annular permalloy iron core, and the proportional iron core is an annular silicon steel sheet iron core.

Further, the first shielding cover includes a SF ₆ density controller and a diamond-coated polyester film filled with SF ₆ ; the diamond-coated polyester film is provided with an opening; the SF ₆ density controller Set on the outside of the outer casing.

Further, the outer casing includes two cover plates and a cylindrical casing; the two cover plates are connected with both ends of the cylindrical casing through flanges; the lower ends of the two cover plates are each provided with two universal wheel; a grounding terminal is arranged on the outside of the cylindrical casing.

Further, it also includes a bracket; the iron core group is mounted on the bracket through bolts; the bracket is installed inside the outer casing through bolts.

The advantages of the present utility model are:

1. By arranging the insulating sleeve, the first shielding cover, the second shielding cover, the shielding plate and the ground terminal, the shielding of the high-voltage power supply is realized, and the danger of electric shock caused by the tester's contact with the high-voltage during the test is effectively prevented. It improves the safety of voltage transformers.

2. By setting the diamond-coated polyester film filled with SF ₆ , since SF ₆ is a new generation of ultra-high voltage insulating dielectric material, the insulation level is greatly improved; by setting the SF ₆ density controller, the SF ₆ The pressure of the SF 6 is monitored, and the insulation of the voltage transformer is indirectly monitored, so as to avoid potential safety hazards caused by the use of the voltage transformer when the SF ₆ pressure is too low.

3. The lower ends of the two cover plates are provided with two universal wheels, which facilitates the movement of the voltage transformer, thereby improving the work efficiency of the testers.

4. By setting the excitation core as a permalloy iron core and the proportional iron core as a silicon steel sheet iron core, the magnetic permeability and cost of the iron core are balanced.

Description of drawings

The present utility model will be further described below with reference to the accompanying drawings and embodiments.

Fig. 1 is a longitudinal sectional view of a two-stage multi-variable ratio standard voltage transformer of the present invention.

Fig. 2 is a transverse sectional view of a standard voltage transformer with two-stage multi-variable ratio of the present invention.

FIG. 3 is a front view of a standard voltage transformer with two-stage multi-variable ratio according to the present invention.

FIG. 4 is a side view of a standard voltage transformer with two-stage multi-variable ratio according to the present invention.

Tag Description:

100- A standard voltage transformer with two-stage multi-variable ratio, 1- equalizing ring, 2- insulating sleeve, 3- outer shell, 4- iron core group, 5- first shielding cover, 6- second shielding cover , 7-wire group, 8-terminal board, 9-conductive rod, 10-shield plate, 11-junction box, 31-cover plate, 32-cylindrical shell, 311-universal wheel, 321-ground terminal, 41- Excitation core, 42-proportional iron core, 51-SF ₆ density controller, 52-Lingge glued polyester film, 71-excitation winding, 72-primary proportional winding, 73-secondary proportional winding.

Detailed ways

Please refer to FIGS. 1 to 4 , a preferred embodiment of a two-stage multi-variable ratio standard voltage transformer 100 of the present invention includes an equalizing ring 1 , an insulating sleeve 2 , an outer casing 3 , a Iron core group 4, a first shielding cover 5, a second shielding cover 6, a wire group 7, a wiring board 8, a conductive rod 9, two shielding plates 10 and a junction box 11; the wire group 7 winding on the iron core group 4; the iron core group 4 is arranged in the first shielding cover 5; the two shielding plates 10 are respectively arranged at both ends of the iron core group 4; the iron core group 4 and the wire group 7. The first shielding cover 5 and the shielding plate 10 are both arranged inside the outer casing 3; the insulating sleeve 2 is arranged at the upper end of the outer casing 3 and communicates with the outer casing 3, and the second shielding cover 6 is arranged in the insulating casing The lower end of the wiring board 8 is connected to the insulating sleeve 2, and the upper end is connected to the pressure equalizing ring 1; The board 8 is connected, and the other end is connected to the wire group 7 ; the junction box 11 is arranged outside the outer casing 3 and is connected to the wire group 7 . The voltage equalizing ring 1 can evenly distribute the high voltage around the object to ensure that there is no potential difference between the various parts of the ring, so as to achieve the effect of voltage equalization, which is used to prevent side lightning strikes; the insulating sleeve 2 is used to protect the conductive rod. 9; The junction box 11 has terminals for user wiring, which are used to select the range as required.

The iron core group 4 includes an excitation core 41 and a proportional iron core 42; the wire group 7 includes an excitation winding 71, a primary proportional winding 72, and a secondary proportional winding 73; the excitation winding 71 is wound around on the excitation core 41; the primary proportional winding 72 is wound on the excitation core 41 and the proportional iron core 42; the secondary proportional winding 73 is wound on the excitation core 41 and the proportional iron core 42, and is connected with the The junction box 11 is connected. The excitation winding 71 and the primary proportional winding 72 are high-voltage input terminals, and the secondary proportional winding 73 is a low-voltage output terminal.

The excitation core 41 is an annular permalloy iron core, and the proportional iron core 42 is an annular silicon steel sheet iron core. The magnetic permeability of permalloy is better than that of silicon steel sheet, but the cost is also higher than that of silicon steel sheet. Balance the magnetic permeability of the iron core and the cost.

The first shielding cover 5 includes a _SF6 density controller 51 and a diamond-coated polyester film 52 filled with _SF6 ; the diamond-coated polyester film 52 is provided with an opening (not shown); The SF ₆ density controller 51 is arranged on the outer side of the outer casing 3 and communicates with the diamond-coated polyester film 52 through the opening. By setting the SF ₆ -filled diamond-coated polyester film 52, since SF ₆ is a new generation of ultra-high voltage insulating dielectric material, the insulation level is greatly improved; by setting the SF ₆ density controller 51 to SF ₆ To monitor the pressure of the voltage transformer 100 indirectly, to avoid potential safety hazards caused by the use of the voltage transformer 100 when the tester does not know that the SF ₆ pressure is too low. The SF ₆ density controller 51 is used to monitor the SF ₆ gas density in the rhombus-coated polyester film 52, and in the event of gas leakage, it will issue a gas supply and lock signal to ensure safety. The SF ₆ density controller that can realize this function can be selected from the prior art, and it is not limited to which type, which can be obtained by those skilled in the art without creative work.

The insulating sleeve 2 is a silicon rubber composite insulating sleeve, and the silicone rubber has excellent insulating properties, corona resistance and arc resistance.

The outer casing 3 includes two cover plates 31 and a columnar casing 32; the two cover plates 31 are connected to both ends of the columnar casing 32 through flanges; the lower ends of the two cover plates 31 are each provided with two a universal wheel 311 ; a ground terminal 321 is provided outside the cylindrical housing 32 . By arranging the insulating sleeve 2 , the first shielding cover 5 , the second shielding cover 6 , the shielding plate 10 and the ground terminal 321 , the shielding of the high-voltage power supply is realized, and the danger of electric shock caused by the tester's contact with the high-voltage during the test is effectively prevented. , which greatly improves the safety of the voltage transformer. The lower ends of the two cover plates 31 are each provided with two universal wheels 311 , which facilitates the movement of the voltage transformer 100 , thereby improving the work efficiency of the tester. The ground terminal 321 is used to ground the voltage transformer 100 .

It also includes a bracket (not shown); the iron core group 4 is installed on the bracket through bolts; the bracket is installed inside the outer casing 3 through bolts. By arranging the bracket, the iron core group 4 is fixed inside the outer casing 3 to avoid shaking when the voltage transformer 100 is transported.

The working principle of the utility model:

Connect the terminal board 8 to a high-voltage power supply, and the high-voltage power supply is transmitted to the excitation winding 71 and the primary proportional winding 72 through the conductive rod 9, and is coupled to the secondary proportional winding 73 to output low-voltage power to the junction box 11. The tester The voltage of the high-voltage power supply is calculated by testing the voltage of the low-voltage power supply in the junction box 11 .

To sum up, the advantages of the present utility model are:

1. By arranging the insulating sleeve, the first shielding cover, the second shielding cover, the shielding plate and the ground terminal, the shielding of the high-voltage power supply is realized, and the danger of electric shock caused by the tester's contact with the high-voltage during the test is effectively prevented. It improves the safety of voltage transformers.

2. By setting the diamond-coated polyester film filled with SF ₆ , since SF ₆ is a new generation of ultra-high voltage insulating dielectric material, the insulation level is greatly improved; by setting the SF ₆ density controller, the SF ₆ The pressure of the SF 6 is monitored, and the insulation of the voltage transformer is indirectly monitored, so as to avoid potential safety hazards caused by the use of the voltage transformer when the SF ₆ pressure is too low.

3. The lower ends of the two cover plates are provided with two universal wheels, which facilitates the movement of the voltage transformer, thereby improving the work efficiency of the testers.

4. By setting the excitation core as a permalloy iron core and the proportional iron core as a silicon steel sheet iron core, the magnetic permeability and cost of the iron core are balanced.

Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments we describe are only illustrative, and not used to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included within the scope of protection of the claims of the present invention.

Claims (6)

1. A two-stage multi-variable ratio standard voltage transformer is characterized in that: comprising an insulating sleeve, an outer casing, an iron core group, a first shielding cover, a second shielding cover, a wire group, a a wiring board, a conductive rod, two shielding plates and a junction box; the wire group is wound on the iron core group; the iron core group is arranged in the first shielding cover; the two shielding plates are respectively arranged on the iron core group the two ends of the core group; the iron core group, the wire group, the first shielding cover and the shielding plate are all arranged inside the outer casing; the insulating sleeve is arranged at the upper end of the outer casing and communicated with the outer casing, the second The shielding cover is arranged in the insulating sleeve; the lower end of the wiring board is connected with the insulating sleeve; the conductive rod is arranged in the second shielding cover, one end of the conductive rod is connected with the wiring board, and the other end is connected with the wire group ; The junction box is arranged on the outside of the outer casing and is connected with the wire group. 2 . The two-stage multi-variable ratio standard voltage transformer according to claim 1 , wherein the iron core group comprises an excitation core and a proportional iron core; the wire group comprises an excitation winding, A primary proportional winding and a secondary proportional winding; the excitation winding is wound on the excitation core; the primary proportional winding is wound around the excitation core and the proportional iron core; the secondary proportional winding is wound around the excitation core and proportional iron core, and connected with the junction box. 3. A dual-stage multi-variable ratio standard voltage transformer as claimed in claim 2, characterized in that: the excitation core is an annular permalloy iron core, and the proportional iron core is an annular silicon steel sheet iron core. 4. A two-stage multi-variable ratio standard voltage transformer as claimed in claim 1, characterized in that: the first shielding case comprises a _SF6 density controller and a _SF6 -filled diamond lattice sizing polyester film; the diamond-coated polyester film is provided with an opening; the SF ₆ density controller is provided on the outer side of the outer casing. 5 . The two-stage multi-variable ratio standard voltage transformer according to claim 1 , wherein the outer casing comprises two cover plates and a cylindrical casing; the two cover plates are connected to each other through flanges. 6 . The two ends of the cylindrical shell are connected; the lower ends of the two cover plates are respectively provided with two universal wheels; the outside of the cylindrical shell is provided with a grounding terminal. 6. A standard voltage transformer with two-stage multi-variable ratio as claimed in claim 1, characterized in that: it further comprises a bracket; the iron core group is mounted on the bracket by means of bolts; the bracket is mounted on the casing by means of bolts inside the body.

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