CN110648821A - A station transformer - Google Patents

Abstract

The invention relates to the technical field of transformers, and specifically discloses a transformer for station use, comprising a casing, a body part and an insulating sleeve. The insulating sleeve is fixed above the casing, and a primary conductive row is arranged on the top of the insulating sleeve. The body part is arranged in the casing, and the body includes a high-voltage coil, a low-voltage coil, an iron core, a side shield and a bottom shield. At both ends, the bottom shield is arranged below the iron core, and the iron core is fixed on the shell through the iron core clip. The outer circular surface of the high-voltage coil is an inclined surface that gradually decreases from the inside to the outside. The transformer for the station has a novel structure, adopts the structure of the transformer to realize the function and function of the transformer, reduces the volume of the transformer, is suitable for small-scale power supply, reduces the manufacturing cost of the transformer, and can achieve a larger transformation ratio.

Description

A station transformer

technical field

The invention relates to the technical field of transformers, in particular to a station transformer, in particular to a gas-insulated station transformer.

Background technique

Generally speaking, a transformer is a device that changes AC voltage or current by utilizing the phenomenon of electromagnetic induction. Traditional transformers generally use oil-immersed insulation structures. Such transformers have the advantages of large size, bulky structure, easy aging, easy fire hazard, poor resistance to space electromagnetic interference, low electrical insulation strength, large core loss, and large partial discharge itself. , high equipment cost, and it is not easy to be used for small-scale power supply, so we need to invent a gas-insulated transformer with small size, reasonable structure and low manufacturing cost, suitable for small-scale power supply.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is aimed at the deficiencies of the prior art, and provides a small gas-insulated station transformer, which adopts the structure of the transformer to achieve the function of the transformer, and is suitable for power supply in substations, villages and factories with large and small people.

In order to solve the above technical problems, the present invention provides a transformer for station use, including a casing, a body and an insulating sleeve, the insulating sleeve is fixed above the casing, and the top of the insulating sleeve is provided with a The primary conductive bar, the body part is arranged in the casing, and it is characterized in that the body includes a high-voltage coil, a low-voltage coil, an iron core, a side shield and a bottom shield, and the high-voltage coil is sleeved on the low-voltage coil. Outside, the low-voltage coil is sleeved on the outside of the iron core, the side shields are arranged at both ends of the iron core, the bottom shield is arranged below the iron core, and the iron core is fixed on the iron core by the iron core clip. Inside the casing, the outer circular surface of the high-voltage coil is an inclined surface that gradually decreases from the inside to the outside, and the high-voltage coil is connected to the primary conductive row.

Further, the station transformer further includes a tap changer, the tap changer is arranged on the outer wall of the housing, and the tap changer is connected to the high-voltage coil.

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

Further, the housing is also provided with a secondary terminal, an inflation valve and a pressure release device, the low-voltage coil is connected to the secondary terminal, and a density relay is provided on the inflation valve.

Specifically, the bottom of the insulating sleeve is fixed to the housing through a head, and a shielding electrode is provided on the inner side of the bottom of the insulating sleeve, and the shielding electrode is fixed on the head.

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

The beneficial effects of the invention are as follows: the transformer used in the gas insulation station of the invention has a novel structure, adopts the structure of the transformer to realize the power and function of the transformer, reduces the volume of the transformer, is suitable for small-scale power supply, reduces the manufacturing cost of the transformer, and at the same time It can achieve a large transformation ratio; the high-voltage coil with a pagoda structure in the body part has the advantages of uniform voltage distribution and good insulation performance. The low-voltage winding with a layered transposition structure is used and an air passage is added to reduce winding loss and improve heat dissipation performance. , reduces the risk of flammability compared to oil-immersed transformers.

Description of drawings

In order to illustrate the technical solutions of the present invention more clearly, the following briefly introduces the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. , for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is the structural representation of the transformer for station of the present invention;

Fig. 2 is a partial cross-sectional view of the body portion of the transformer for the station of the present invention.

In the figure: 1-shell, 2-body, 3-insulating sleeve, 4-primary conductive row, 5-head, 6-shield electrode, 7-tap changer, 8-secondary terminal, 9- Inflatable valve, 10-density relay, 11-pressure release device, 21-high voltage coil, 22-low voltage coil, 23-core, 24-side shield, 25-bottom shield, 26-core clip.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In a specific embodiment of the present invention, as shown in FIG. 1 to FIG. 2 , the present invention specifically discloses a station transformer, which includes a casing 1 , a body 2 and an insulating bushing 3 . The top is provided with a primary conductive row 4, the insulating sleeve 3 is fixed above the casing 1, the bottom of the insulating sleeve 3 is fixed with the casing 1 through the head 5, the insulating sleeve 3 There is a shielding electrode 6 on the inner side of the bottom, and the shielding electrode 6 is fixed on the sealing head 5 .

The body 2 is arranged in the housing 1, and the body 2 includes a high-voltage coil 21, a low-voltage coil 22, an iron core 23, a side shield 24 and a bottom shield 25, and the high-voltage coil 21 is sleeved on the low-voltage coil 21. The outer side of the coil 22, the low-voltage coil 22 is sleeved on the outer side of the iron core 23, the side shields 24 are arranged at both ends of the iron core 23, and the bottom shield 25 is arranged below the iron core 23, so The iron core 23 is fixed in the housing 1 through an iron core clip 26 , and the iron core 23 is a high-conductivity magnetic core; the bottom shield is fixed on the iron core clip. Preferably, the high-voltage coil 21 is wound on a high-voltage insulating cylinder, the high-voltage insulating cylinder is sleeved on the outside of the low-voltage coil 22, the low-voltage coil 22 is wound on the outside of the low-voltage insulating cylinder, and the low-voltage insulating sleeve is sleeved It is provided outside the iron core 23 . Since the transformation ratio of the station transformer is larger than that of the conventional transformer, the outer circular surface of the high-voltage coil 21 is set as a slope that gradually decreases from the inside to the outside for uniform electric field distribution; the low-voltage coil adopts the spiral winding, because the spiral windings are connected in parallel If there are many wires, the wires can be divided into two groups, thus forming a double helix structure, and air passages can be arranged between the winding layers or between the turns to increase the heat dissipation performance. Due to the large current of the low-voltage coil, it is necessary to adopt the method of displacement wire or wire transposition to reduce eddy current loss.

The station transformer also includes a tap changer 7, which is arranged on the outer wall of the housing 1, the tap changer 7 is connected to the high-voltage coil 21, and the tap changer is used to adjust the transformer. Compare.

The housing 1 is also provided with a secondary terminal 8, an inflation valve 9 and a pressure release device 11, the low-voltage coil 22 is connected to the secondary terminal 8, and the inflation valve 9 is provided with a density relay 10. , the inflating valve 9 is used to inflate the shell with gas, the density relay 10 is used to detect the pressure of the gas inside the shell, and the pressure release device 11 is used to release the gas in the shell when the pressure in the shell is too high.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made, and these improvements and modifications may also be regarded as It is the protection scope of the present invention.

Claims (6)

1. A transformer for station use, comprising a casing, a body and an insulating sleeve, the insulating sleeve is fixed above the casing, the top of the insulating sleeve is provided with a primary conductive row, and the body is The components are arranged in the casing, and it is characterized in that 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 on the outside of the low-voltage coil, and the low-voltage coil is sleeved On the outside of the iron core, the side shields are arranged at both ends of the iron core, the bottom shield is arranged below the iron core, the iron core is fixed in the casing by an iron core clip, and the high-voltage coil The outer circular surface of the coil is an inclined surface gradually decreasing from the inside to the outside, and the high-voltage coil is connected to the primary conductive row. 2 . The station transformer according to claim 1 , wherein the station transformer further comprises a tap changer, the tap changer is arranged on the outer wall of the housing, and the tap changer connected to the high voltage coil. 3 . The station transformer according to claim 1 , wherein the high-voltage coil is wound on a high-voltage insulating cylinder, the high-voltage insulating cylinder is sleeved on the outside of the low-voltage coil, and the low-voltage coil is wound around 3 . On the outside of the low-voltage insulating cylinder, the low-voltage insulating cylinder is sleeved on the outside of the iron core, and the low-voltage coil is a spiral winding. 4 . A station transformer according to claim 1 , wherein a secondary terminal, an inflation valve and a pressure release device are further provided on the casing, and the low-voltage coil is connected to the secondary terminal. 5 . , the inflatable valve is provided with a density relay. 5. A station transformer according to claim 1, characterized in that the bottom of the insulating sleeve is fixed with the casing through a head, and a shielding electrode is provided on the inner side of the bottom of the insulating sleeve. The shielding electrode is fixed on the head. 6 . The station transformer according to claim 1 , wherein the bottom shield is fixed on the iron core clip. 7 .

Images