CN116705481A - A Test Voltage Transformer for GIS - Google Patents

Abstract

The invention relates to a test voltage transformer for a GIS, which is characterized in that: the device comprises a basin-type insulator, a conductive tube, a shell, a body part, an inflation valve, a test junction box, a PT junction box, a base and an explosion-proof piece; the transformer is of a structure to realize the power and action of the transformer, so that the volume of the transformer is reduced, the transformer is suitable for small-range power supply, the manufacturing cost of the transformer is reduced, and a larger transformation ratio can be realized; the high-voltage coil with the pagoda structure adopted in the body part has the advantages of uniform voltage distribution and good insulating property, and the low-voltage winding with the layered transposition structure is adopted and the air passage is additionally arranged, so that the winding loss is reduced, the heat dissipation performance is improved, and the inflammable risk is reduced compared with an oil immersed transformer; the test junction box is added for connecting a test voltage source, and a capacitive voltage divider is arranged in the test junction box and used for measuring test voltage during a test; the voltage transformer can be used as a conventional transformer and can meet the requirement of PVT (physical vapor transport) for testing.

Description

A Test Voltage Transformer for GIS

technical field

The invention relates to the field of voltage transformers for GIS, in particular to a test voltage transformer for GIS.

Background technique

In general, a transformer is a device that changes AC voltage or current by utilizing the phenomenon of electromagnetic induction. Traditional transformers generally adopt an oil-immersed insulation structure. This type of transformer has a large volume, heavy structure, easy aging, fire hazard, poor resistance to space electromagnetic interference, low electrical insulation strength, large core loss, and a large amount of partial discharge itself. , high equipment cost and other shortcomings, and it is not easy to be used for small-scale power supply, so we need to invent a gas-insulated transformer with small volume, reasonable structure arrangement, low manufacturing cost, and suitable for small-scale power supply.

In addition, conventional small-scale gas-insulated transformers cannot meet the requirements of GIS tests.

Contents of the invention

The technical problem to be solved by the present invention is to provide a test voltage transformer for GIS, which can solve the problem that the conventional voltage transformer cannot meet the GIS test without a capacitive voltage divider structure.

In order to solve the above technical problems, the technical solution of the present invention is: a test voltage transformer for GIS. Junction boxes, bases and rupture discs;

The top of the housing is provided with a basin-type insulator, and the bottom of the basin-type insulator is fixed to the top of the housing through a head; the side wall of the housing is provided with a test junction box and a PT junction box; the test A capacitive voltage divider is arranged in the junction box; the conductive tube is arranged along the vertical direction and the bottom end of the conductive tube is connected to the body part, and the top end of the conductive tube is connected to the pot insulator;

The inflation valve is arranged on the side wall of the housing, and is used to fill the housing with gas;

The body part is installed on the base, the body includes a high-voltage coil, a low-voltage coil, an iron core, a side shield and a bottom shield, the high-voltage coil is sleeved outside the low-voltage coil, and the low-voltage coil is sleeved on the The outer side of the iron core, the side shields are arranged at both ends of the iron core, the bottom shield is arranged under the iron core, the iron core is fixed in the housing by the iron core clamp, and the outer shield of the high-voltage coil The circular surface is a slope that gradually decreases from the inside to the outside, and the high-voltage coil is connected to the pot insulator;

The explosion-proof plate is arranged on the bottom end of the shell.

Further, the high-voltage coil is wound on a high-voltage insulation cylinder, and the high-voltage insulation cylinder is sleeved on the outside of the low-voltage coil, and the low-voltage coil is wound on the outside of the low-voltage insulation cylinder, and the low-voltage insulation cylinder is sleeved on the outside of the low-voltage coil. The outer side of the iron core, the low-voltage coil is a spiral winding.

Further, the bottom shield is fixed on the core clip.

The advantages of the present invention are:

1) The structure of the test voltage transformer for GIS in the present invention is novel, and the structure of the transformer is used to realize the power and function of the transformer, which reduces the volume of the transformer, is suitable for small-scale power supply, reduces the manufacturing cost of the transformer, and can realize relatively Large transformation ratio; the high-voltage coil with pagoda structure on the body has the advantages of uniform voltage distribution and good insulation performance. The low-voltage winding with layered transposition structure and additional air passages are used to reduce winding loss and improve heat dissipation performance. Compared with the immersed transformer, the risk of flammability is reduced; by adding a test junction box, it is used to connect the test voltage source, and a capacitive voltage divider is set in the test junction box to measure the test voltage during the test; the voltage transformer It can not only be used as a conventional transformer, but also meet the requirements of PVT for testing.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural diagram of a GIS test voltage transformer of the present invention.

Fig. 2 is a circuit structure diagram of a test junction box and a PT junction box of a GIS test voltage transformer of the present invention.

Fig. 3 is a partial cross-sectional view of body parts of a GIS test voltage transformer of the present invention.

Implementation

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

A test voltage transformer for GIS as shown in Figure 1 to Figure 3, including pot insulator 1, conductive pipe 2, shell 3, body parts 4, inflation valve 5, test junction box 6, PT junction box 7 , base 8 and explosion-proof disk 9;

The top of the housing 3 is provided with a basin-type insulator 1, and the bottom of the basin-type insulator 1 is fixed to the top of the housing 3 through a head; the side wall of the housing 3 is provided with a test junction box 6 and a PT junction box 7; the test wiring A capacitive voltage divider is arranged in the box 7; the conductive tube 2 is arranged along the vertical direction and the bottom end of the conductive tube 2 is connected to the body part 4, and the top end of the conductive tube 2 is connected to the pot insulator 1;

The inflation valve 5 is arranged on the side wall of the housing, and is used to fill the housing 3 with gas;

The body part 4 is installed on the base, and the body includes a high-voltage coil 41, a low-voltage coil 42, an iron core 43, a side shield 44 and a bottom shield 45. The high-voltage coil 41 is set on the outside of the low-voltage coil 42, and the low-voltage coil 42 is set on the iron core. 43, the side shields 44 are arranged at both ends of the iron core, the bottom shield 45 is arranged under the iron core 43, the iron core 43 is fixed in the casing by the iron core clamp 46, and the outer circular surface of the high-voltage coil 41 gradually decreases from the inside to the outside. The inclined plane, the high-voltage coil 41 is connected with the pot insulator 1;

The explosion-proof disk 9 is arranged on the bottom end of the casing 3 .

The high-voltage coil 41 is wound on the high-voltage insulating cylinder, the high-voltage insulating cylinder is set on the outside of the low-voltage coil 42, the low-voltage coil 42 is wound on the outside of the low-voltage insulating cylinder, the low-voltage insulating cylinder is set on the outside of the iron core 43, and the low-voltage coil 42 is spiral winding.

The bottom shield 45 is fixed on the core clamp 46 .

The working principle of the present invention is: the GIS test voltage transformer has a novel structure, and the structure of the transformer is used to realize the power and function of the transformer, which reduces the volume of the transformer, is suitable for small-scale power supply, reduces the manufacturing cost of the transformer, and can simultaneously Larger transformation ratio is achieved; the high-voltage coil with pagoda structure is used in the body, which has the advantages of uniform voltage distribution and good insulation performance. The low-voltage winding with layered transposition structure and additional air passages are used to reduce winding loss and improve heat dissipation. Compared with oil-immersed transformers, the risk of flammability is reduced; by adding a test junction box, it is used to connect the test voltage source, and a capacitive voltage divider is set in the test junction box to measure the test voltage during the test; the voltage The transformer can not only be used as a conventional transformer, but also meet the requirements of PVT for testing.

Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (3)

1. A test voltage transformer for GIS is characterized in that: comprise basin type insulator, conducting pipe, housing, device body parts, inflation valve, test junction box, PT junction box, base and explosion-proof plate; The top of the housing is provided with a basin-type insulator, and the bottom of the basin-type insulator is fixed to the top of the housing through a head; the side wall of the housing is provided with a test junction box and a PT junction box; the test A capacitive voltage divider is arranged in the junction box; the conductive tube is arranged along the vertical direction and the bottom end of the conductive tube is connected to the body part, and the top end of the conductive tube is connected to the pot insulator; The inflation valve is arranged on the side wall of the housing, and is used to fill the housing with gas; The body part is installed on the base, the body includes a high-voltage coil, a low-voltage coil, an iron core, a side shield and a bottom shield, the high-voltage coil is sleeved outside the low-voltage coil, and the low-voltage coil is sleeved on the The outer side of the iron core, the side shields are arranged at both ends of the iron core, the bottom shield is arranged under the iron core, the iron core is fixed in the housing by the iron core clamp, and the outer shield of the high-voltage coil The circular surface is a slope that gradually decreases from the inside to the outside, and the high-voltage coil is connected to the pot insulator; The explosion-proof plate is arranged on the bottom end of the shell. 2. A kind of GIS testing voltage transformer according to claim 1, characterized in that: said high-voltage coil is wound on a high-voltage insulating cylinder, said high-voltage insulating cylinder is sleeved on the outside of said low-voltage coil, said The low-voltage coil is wound on the outside of the low-voltage insulating cylinder, and the low-voltage insulating cylinder is sleeved on the outside of the iron core. The low-voltage coil is a spiral winding. 3. A test voltage transformer for GIS according to claim 1, characterized in that: the bottom shield is fixed on the iron core clamp.