CN114024242A - Gas insulation voltage transformer cabinet - Google Patents

Abstract

The invention relates to a gas insulation voltage transformer cabinet, which comprises a gas box and a main frame for supporting the gas box, wherein the gas box comprises an isolating switch and a voltage transformer, an alternating current three-phase line enters the gas box from a high-voltage wall bushing above a cabinet body of the voltage transformer cabinet, is connected to a high-voltage wiring end after passing through the isolating switch, is connected to a first iron core after passing through a fuse and is wound into a primary coil, and the primary coil is grounded through a primary harmonic elimination coil wound on a second iron core after being synthesized by three phases. According to the invention, the voltage transformer is arranged in the air box, so that the problems of complex wiring, potential safety hazard and space waste caused by the arrangement of the voltage transformer cabinet in the prior art are solved.

Description

A gas-insulated voltage transformer cabinet

technical field

The invention relates to the technical field of gas-insulated switchgear, in particular to a gas-insulated voltage transformer cabinet.

Background technique

Gas-insulated voltage transformer cabinets usually use SF ₆ gas, N ₂ gas or their mixed gas as the insulating medium, which has the advantages of small size, high reliability and good safety, and is widely used in the field of medium-voltage power distribution. The voltage transformer is the core equipment of the voltage transformer cabinet, which has the functions of measurement, power supply and protection. In the traditional gas-insulated voltage transformer cabinet, the gas box filled with insulating medium is arranged in the upper part of the cabinet and has an isolation switch inside. The box bushing enters the gas-insulated voltage transformer cabinet of the gas box, and is connected with the isolating switch through the conductor, and finally conducts with the busbar. FIG. 1 shows a schematic structural diagram of a gas-insulated voltage transformer cabinet in the prior art. The gas-insulated voltage transformer cabinet in FIG. 1 includes a gas box 1 , an isolation switch 11 and a voltage transformer 12 , wherein the voltage transformer 12 is provided with In the lower part of the voltage transformer cabinet, the voltage transformer in this layout needs to be epoxy poured to meet the insulation requirements, the wiring is complicated, there are potential safety hazards, and there is a problem of wasting space.

SUMMARY OF THE INVENTION

Based on the above situation of the prior art, the purpose of the present invention is to provide a gas-insulated voltage transformer cabinet. The voltage transformer cabinet of the present invention has high reliability, good economy, The advantage of compact structure.

In order to achieve the above object, according to one aspect of the present invention, a gas-insulated voltage transformer cabinet is provided, including a gas box and a main frame supporting the gas box; the gas box includes an isolating switch and a voltage transformer; wherein,

The voltage transformer includes a high-voltage terminal, a fuse box with a built-in fuse, a first iron core and a second iron core;

The AC three-phase line enters the air box from the high-voltage through-wall bushing above the voltage transformer cabinet, passes through the isolating switch, the high-voltage terminal, and the fuse in turn, and then connects to the first iron core to be wound into a primary coil , the primary coil is grounded through the primary harmonic elimination coil wound on the second iron core after three-phase synthesis.

Further, the high-voltage terminal, the fuse box and the first iron core all include a three-phase independent structure, corresponding to the AC three-phase line.

Further, the second iron core is also wound with a secondary harmonic elimination coil and a protection wiring coil;

The protection wiring coil constitutes a protection output terminal.

Further, a secondary coil is wound on the first iron core;

One end of the secondary coil is grounded through the secondary harmonic elimination coil wound on the second iron core after three-phase synthesis, and the other end is used as the output end of the voltage transformer.

Further, it also includes a first fixing structure and a second fixing structure.

Further, the first fixing structure is used for sealingly fixing the fuse box to the inner wall of the air box, so that the built-in fuse can be replaced outside the air box.

Further, the second fixing structure is used for fixing the voltage transformer to the inner wall of the air box.

Further, the main frame supporting the air box includes a secondary chamber, a mechanism chamber, and a pressure relief channel.

Further, the voltage transformer output end and the protection output end pass through the air box through the aviation plug and enter the secondary chamber;

The output terminal of the voltage transformer is output to the measuring device;

The protection output terminal is output to the protection device.

Further, the air box is filled with insulating gas and sealed.

To sum up, the present invention provides a gas-insulated voltage transformer cabinet, which includes a gas box and a main frame supporting the gas box. The gas box includes an isolation switch and a voltage transformer, and the AC three-phase line is connected from the voltage transformer. The high-voltage through-wall bushing above the cabinet body enters the air box, is connected to the high-voltage terminal after passing through the isolation switch, and is connected to the first iron core after passing through the fuse to form a primary coil. The primary coil is synthesized by three-phase. Afterwards, it is grounded through the primary harmonic elimination coil wound on the second iron core. The invention overcomes the problems of complicated wiring, potential safety hazards and waste of space caused by the layout of the voltage transformer cabinet in the prior art by building the voltage transformer in the air box.

The present invention has following beneficial technical effect:

(1) Compared with the traditional gas-insulated voltage transformer cabinet, the physical distance between the voltage transformer built in the gas box and the high-voltage terminal is greatly shortened, which can make the structure of the whole cabinet more compact and reduce the cost of the whole cabinet.

(2) By building the voltage transformer in the air box, insulating gas can be used instead of epoxy resin as the main insulating medium, and the insulating performance of the gas has good recoverability, so the voltage transformer cabinet provided by the present invention has Better insulation performance and lower transformer product cost. And realize the structural design that the fuse can be replaced externally, so that the space of the air box can be better utilized.

3) The voltage transformer cabinet provided by the present invention does not need to pass through the air box wall when the voltage transformer obtains high-voltage power supply, thereby reducing the safety risk brought thereby, thereby improving the reliability of the entire cabinet.

Description of drawings

Fig. 1 is the structural representation of gas-insulated voltage transformer cabinet in the prior art;

Fig. 2 is the overall structure schematic diagram of the gas-insulated voltage transformer cabinet of the present invention;

FIG. 3 is a schematic diagram of the coil winding circuit of the iron core.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the specific embodiments and the accompanying drawings. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts of the present invention.

The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings. According to an embodiment of the present invention, a gas-insulated voltage transformer cabinet is provided. The overall structural schematic diagram of the gas-insulated voltage transformer cabinet is shown in FIG. 1 , including a gas box 1 and a main frame supporting the gas box. Wherein, the air box 1 is provided with an isolation switch 11, a voltage transformer 12 and an electrical connection, and the electrical connection may include conductors for electrical connection, such as copper bars. The voltage transformer 12 includes a high-voltage terminal 121 , a fuse holder 122 with a built-in fuse, a first iron core 123 and a second iron core 124 . The high-voltage terminal 121 , the fuse box 122 and the iron core 123 all have a three-phase independent structure, corresponding to the A, B and C three-phase lines of the AC system of the main conductive circuit. AC three-phase lines, such as A, B and C three-phase lines, enter the air box 1 from the high-voltage wall bushing above the voltage transformer cabinet body, pass through the isolation switch 11, and then connect to the high-voltage terminal 121, and pass through the high-voltage terminal 121. The series-connected fuse is connected to the first iron core 123 and wound to form the primary coil 1231. The series-connected fuse means that the fuse is connected in series with the coil mentioned later, so that the fuse and the primary coil in the line form a series relationship. The primary coil 1231 is grounded through the primary harmonic elimination coil 1241 wound on the second iron core 124 after three-phase synthesis. The three-phase synthesis can be formed by winding (collecting) the three outgoing ends of the primary coil of the three-phase line on the second iron core through (collecting) the same incoming end to form a harmonic elimination coil. FIG. 3 shows a schematic diagram of the coil winding circuit of the iron core. As shown in FIG. 3 , in addition to the primary harmonic elimination coil 1241 wound on the second iron core 124 , the second harmonic elimination coil 1242 and The protection wiring coil 1243; the protection wiring coil 1243 constitutes the protection output terminal. The first iron core 123 is wound with a secondary coil 1232 in addition to the primary coil 1231 . One end of the secondary coil 1231 is grounded through the secondary harmonic elimination coil 1242 wound on the second iron core 124 after three-phase synthesis, and the other end is used as the output end of the voltage transformer.

In addition, the voltage transformer cabinet also includes a first fixing structure and a second fixing structure. The first fixing structure is used for sealingly fixing the fuse holder to the inner wall of the air box, so that the built-in fuse can be replaced outside the air box. Fixing the fuse box on the inner wall means that its fixed contact surface is in the air box. The gas box has an opening at the fixed position of the fuse box, one side of the fuse box is communicated with the inner wall of the gas box, and the other side is communicated with the outer wall of the gas box. Therefore, the fuse can be replaced on the side that communicates with the outer wall of the air box, that is, external replacement. The second fixing structure is used for fixing the voltage transformer to the inner wall of the air box. The main frame supporting the air box includes a secondary chamber, a mechanism chamber, and a pressure relief channel. The voltage transformer output end and the protection output end pass out of the air box through the aviation plug and enter the secondary chamber; the voltage transformer output end is output to the measuring device; the protection output end is output to the protection device. The air box 1 is filled with insulating gas and sealed.

To sum up, the present invention relates to a gas-insulated voltage transformer cabinet, including a gas box and a main frame supporting the gas box, wherein the gas box includes an isolation switch and a voltage transformer, and the AC three-phase line is connected from the voltage transformer. The high-voltage through-wall bushing above the cabinet body enters the air box, is connected to the high-voltage terminal after passing through the isolation switch, and is connected to the first iron core after passing through the fuse to form a primary coil. The primary coil is synthesized by three phases. It is grounded through the primary harmonic elimination coil wound on the second iron core. The invention overcomes the problems of complicated wiring, potential safety hazards and waste of space caused by the layout of the voltage transformer cabinet in the prior art by building the voltage transformer in the air box.

It should be understood that the above-mentioned specific embodiments of the present invention are only used to illustrate or explain the principle of the present invention, but not to limit the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present invention should be included within the protection scope of the present invention. Furthermore, the appended claims of this invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalents of such scope and boundaries.

Claims (10)

1. A gas insulation voltage transformer cabinet is characterized by comprising a gas box and a main frame for supporting the gas box; the gas tank comprises an isolating switch and a voltage transformer; wherein,

the voltage transformer comprises a high-voltage terminal, a fuse cabin with a built-in fuse, a first iron core and a second iron core;

an alternating current three-phase line enters the air box from a high-voltage wall bushing above the cabinet body of the voltage transformer, sequentially passes through the isolating switch, the high-voltage wiring end and the fuse, and then is connected to the first iron core to be wound into a primary coil, and the primary coil is grounded through a primary harmonic elimination coil wound on the second iron core after being synthesized by three phases.

2. The voltage transformer cabinet according to claim 1, wherein the high voltage terminal, fuse box and first core each comprise a three-phase independent structure corresponding to the ac three-phase line.

3. The voltage transformer cabinet according to claim 2, wherein a second harmonic elimination coil and a protection wiring coil are further wound on the second iron core;

the protection wiring coil forms a protection output end.

4. The voltage transformer cabinet according to claim 3, wherein a secondary coil is further wound on the first iron core;

one end of the secondary coil is grounded through a secondary resonance elimination coil wound on the second iron core after three-phase synthesis, and the other end of the secondary coil is used as the output end of the voltage transformer.

5. The voltage transformer cabinet of claim 4, further comprising a first fixed structure and a second fixed structure.

6. The voltage transformer cabinet according to claim 5, wherein the first fixing structure is used for hermetically fixing the fuse box to an inner wall of the gas box so as to enable replacement of the built-in fuse outside the gas box.

7. The voltage transformer cabinet according to claim 6, wherein the second fixing structure is used for fixing the voltage transformer to the inner wall of the air box.

8. The voltage transformer cabinet according to claim 7, wherein the main frame supporting the air box includes a secondary chamber, a mechanism chamber, and a pressure relief channel.

9. The voltage transformer cabinet according to claim 8, wherein the voltage transformer output and the protection output pass out of the air box and into the secondary chamber through an aviation plug;

the output end of the voltage transformer is output to a measuring device;

and the protection output end is output to the protection device.

10. The voltage transformer cabinet according to claim 9, wherein the gas box is filled with an insulating gas and sealed.

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