阅读说明：本技术 一种500kv直流用供能变压器 (500KV DC energy supply transformer ) 是由 陈邦栋 杨建� 冒爱丽 桑文磊 于 2018-06-08 设计创作，主要内容包括：本发明涉及变压器技术领域,具体公开了一种500KV直流用供能变压器,包括顶板、硅橡胶套管和外壳,外壳内设有高压线圈、低压线圈、铁芯、侧屏蔽和底屏蔽,外壳内底部设有底板,高压线圈底部由支撑件支撑,高压线圈包括高压绝缘筒、高压铜线和一次铝筒；铁芯通过铁芯夹件固定在底板上,低压线圈包括低压铜线和低压绝缘筒,侧屏蔽设置在铁芯夹件的侧面,底屏蔽设置在铁芯夹件的下部。本发明结构紧凑、排布合理,维护、保养方便,耐高压能力强,电气及防爆性能优异,采用倒八字型高压内电极,高压线圈外侧设置了圆弧状屏蔽电极,底部采用嵌入式绝缘支撑结构进行支撑,提高了设备的绝缘性和可靠性,保证设备长期稳定的可靠运行。(The invention relates to the technical field of transformers, and particularly discloses a 500KV direct current energy supply transformer, which comprises a top plate, a silicon rubber sleeve and a shell, wherein a high-voltage coil, a low-voltage coil, an iron core, a side shield and a bottom shield are arranged in the shell, a bottom plate is arranged at the bottom in the shell, the bottom of the high-voltage coil is supported by a supporting piece, and the high-voltage coil comprises a high-voltage insulating cylinder, a high-voltage copper wire and a primary aluminum cylinder; the iron core passes through the iron core folder to be fixed on the bottom plate, and low voltage coil includes low voltage copper line and low pressure insulating cylinder, and the side shield sets up the side at the iron core folder, and the end shield sets up the lower part at the iron core folder. The invention has compact structure, reasonable arrangement, convenient maintenance, strong high-voltage resistance and excellent electrical and explosion-proof performance, adopts the inverted splayed high-voltage inner electrode, arranges the arc shielding electrode outside the high-voltage coil, and supports the bottom by adopting the embedded insulation supporting structure, thereby improving the insulation and reliability of the equipment and ensuring the long-term stable and reliable operation of the equipment.)

1. The energy supply transformer for 500KV direct current is characterized by comprising a top plate (1), a silicon rubber sleeve (2) and a shell (3), wherein the top plate (1) is arranged at the top end of the silicon rubber sleeve (2), the bottom end of the silicon rubber sleeve (2) is fixed to the top of the shell (3), a primary lead pipe (6) is arranged in the silicon rubber sleeve (2), the top of the primary lead pipe (6) extends to the top plate (1) and is fixed to the inner side of the top plate (1), and the bottom of the primary lead pipe (6) extends into the shell (3);

A high-voltage coil, a low-voltage coil, an iron core (9), a side shield (10) and a bottom shield (11) are arranged in the shell (3), a bottom plate (29) is arranged at the bottom in the shell (3), the bottom of the high-voltage coil is supported by a supporting piece, and the high-voltage coil comprises a high-voltage insulating cylinder (12), a high-voltage copper wire (13) and a primary aluminum cylinder (14); the primary aluminum tube (14) is arranged at the bottom of the primary lead tube (6), the high-voltage insulating tube (12) is poured on the inner wall of the primary aluminum tube (14) through epoxy resin, the high-voltage copper wire (13) is wound on the high-voltage insulating tube (12), and an arc-shaped shielding electrode (15) is arranged on the outer side of the primary aluminum tube (14);

Iron core (9) are fixed through iron core folder (16) on bottom plate (29), iron core (9) and high-voltage coil parallel arrangement, low-voltage coil includes low voltage copper line (17) and low voltage insulating cylinder (18), the both ends of low voltage insulating cylinder (18) are fixed on iron core folder (16), low voltage copper line (17) winding is in on the low voltage insulating cylinder (18), side shield (10) set up the side of iron core folder (16), end shield (11) set up the lower part of iron core folder (16).

2. a 500KV dc power transformer according to claim 1, characterized in that the outside of the top plate (1) is provided with a high voltage outer electrode (4), and the inside of the top plate (1) is provided with an inverted-splayed high voltage inner electrode (5); the outer side of the bottom end of the silicon rubber sleeve (2) is provided with a low-voltage outer electrode (23), and the inner side of the bottom end of the silicon rubber sleeve is provided with a regular splayed low-voltage inner electrode (24).

3. the 500KV direct current energy supply transformer according to claim 1, wherein a plurality of air holes are formed in the outer wall of the primary lead tube (6), a guide sleeve (7) and a guide electrode (8) are arranged at the bottom of the primary lead tube (6), the guide sleeve (7) is sleeved on the inner side of the bottom of the primary lead tube (6), the guide electrode (8) is sleeved on the outer side of the bottom of the primary lead tube (6), the bottom of the guide sleeve (7) is fixed with the inner side of the bottom of the guide electrode (8), and the outer side of the bottom of the guide electrode (8) is fixed with the top of the primary aluminum cylinder (14).

4. An energy supply transformer for 500KV direct current according to claim 1, characterized in that the supports have two sets, two sets of supports are distributed at the bottom of the high voltage coil in a splayed shape, each set of supports comprises a T-shaped arc support (19), a top insert (20), a support rod (21) and a bottom support seat (22), the bottom support seat (22) is fixed on the bottom plate (29), the bottom of the support rod (21) is embedded on the bottom support seat (22), the bottom of the top insert (20) is embedded on the top of the support rod (21), the bottom of the T-shaped arc support (19) is embedded on the top insert (20), and the top is supported on the outer side of the primary aluminum cylinder.

5. A500 KV DC-powered transformer according to claim 4, characterised in that the support rods (21) are Teflon insulated support rods.

6. A500 KV DC power supply transformer according to claim 4, characterized in that a secondary outlet terminal (25) is provided on the outer side of the casing, the secondary outlet terminal (25) is connected with the low voltage coil, and a secondary outlet box (26) is provided outside the secondary outlet terminal (25).

7. A500 KV DC powered transformer according to claim 6, further comprising an explosion-proof sheet (27) and a gas inlet (30), the explosion-proof sheet (27) and the gas inlet (30) being respectively provided outside the housing, and a density meter (28) being provided outside the gas inlet (30).

Technical Field

The invention relates to the technical field of transformers, in particular to a 500KV direct current energy supply transformer.

Background

The world power transmission system is developing towards more energy-saving and environment-friendly direct current transmission, so scientists are developing corresponding direct current circuit breakers of important power safety control equipment, and the direct current circuit breakers need equipment capable of solving the energy supply problem.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a 500KV direct current energy supply transformer aiming at the defects of the prior art, wherein an inverted splayed shielding electrode is adopted, the distribution of internal and external electric fields is improved, metal conductive particles are captured and restrained, and discharge is avoided; and meanwhile, the bottom of the high-voltage coil adopts an embedded insulating support rod, so that the surface of the insulating part improves the insulation and reliability of the equipment.

In order to solve the technical problem, the invention provides a 500KV direct current energy supply transformer which comprises a top plate, a silicon rubber sleeve and a shell, wherein the top plate is arranged at the top end of the silicon rubber sleeve, the bottom end of the silicon rubber sleeve is fixed at the top of the shell, a primary lead pipe is arranged in the silicon rubber sleeve, the top of the primary lead pipe extends to the top plate and is fixed on the inner side of the top plate, and the bottom of the primary lead pipe extends into the shell;

The high-voltage coil comprises a high-voltage insulating cylinder, a high-voltage copper wire and a primary aluminum cylinder; the primary aluminum tube is arranged at the bottom of the primary lead tube, the high-voltage insulating tube is poured on the inner wall of the primary aluminum tube through epoxy resin, the high-voltage copper wire is wound on the high-voltage insulating tube, and an arc-shaped shielding electrode is arranged on the outer side of the primary aluminum tube;

The iron core passes through the iron core folder to be fixed on the bottom plate, iron core and high-voltage coil parallel arrangement, low-voltage coil includes low-voltage copper line and low-voltage insulating cylinder, the both ends of low-voltage insulating cylinder are fixed on the iron core folder, the winding of low-voltage copper line is in on the low-voltage insulating cylinder, the side shielding sets up the side of iron core folder, end shielding sets up the lower part of iron core folder.

Furthermore, a high-voltage outer electrode is arranged on the outer side of the top plate, and an inverted splayed high-voltage inner electrode is arranged on the inner side of the top plate; the outer side of the bottom end of the silicon rubber sleeve is provided with a low-voltage outer electrode, and the inner side of the bottom end of the silicon rubber sleeve is provided with a regular splayed low-voltage inner electrode.

Furthermore, a plurality of air holes are formed in the outer wall of the primary lead tube, a guide sleeve and a guide electrode are arranged at the bottom of the primary lead tube, the guide sleeve is sleeved on the inner side of the bottom of the primary lead tube, the guide electrode sleeve is arranged on the outer side of the bottom of the primary lead tube, the bottom of the guide sleeve is fixed to the inner side of the bottom of the guide electrode, and the outer side of the bottom of the guide electrode is fixed to the top of the primary aluminum tube.

Furthermore, the support pieces are provided with two groups, the two groups of support pieces are distributed at the bottom of the high-voltage coil in a splayed shape, each group of support pieces comprises a T-shaped arc support piece, a top insert, a support rod and a bottom support seat, the bottom support seat is fixed on the bottom plate, the bottom of the support rod is embedded on the bottom support seat, the bottom of the top insert is embedded on the top of the support rod, the bottom of the T-shaped arc support piece is embedded on the top insert, and the top support is arranged on the outer side of the primary aluminum cylinder.

Specifically, the support rod is a polytetrafluoroethylene insulation support rod.

furthermore, a secondary wire outlet end is arranged on the outer side of the shell and connected with the low-voltage coil, and a secondary wire outlet box is arranged outside the secondary wire outlet end.

Furthermore, the transformer further comprises an explosion-proof sheet and a gas inlet, wherein the explosion-proof sheet and the gas inlet are respectively arranged on the outer side of the shell, a density meter is arranged on the outer side of the gas inlet, the gas inlet is used for introducing insulating gas, and the insulating gas is sulfur hexafluoride.

The invention has the beneficial effects that: the energy supply transformer has the advantages of compact structure, reasonable arrangement, convenient maintenance, strong high-voltage resistance and excellent electrical and explosion-proof performance, adopts the inverted splayed high-voltage inner electrode, can improve the distribution of an internal electric field and an external electric field, captures internal suspended charged particles, restrains the internal suspended charged particles, reduces the aggregation of the charged particles on the positive electrode, and avoids discharge; the arc-shaped shielding electrode is arranged on the outer side of the high-voltage coil, and the bottom of the high-voltage coil is supported by an embedded polytetrafluoroethylene insulation supporting structure, so that the electric field distortion degree of the surface of an insulation part is smaller, the distribution is more uniform, the insulation property and the reliability of equipment are improved, the reliable operation of the equipment which can be stable for a long time is ensured, and the occurrence of the equipment failure rate is reduced.

Drawings

in order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of the power transformer of the present invention;

FIG. 2 is a view A-A of FIG. 1;

Fig. 3 is a partially enlarged view of a coil portion.

in the figure: 1-top plate, 2-silicon rubber sleeve, 3-shell, 4-high voltage outer electrode, 5-inverted V-shaped high voltage inner electrode, 6-primary lead tube, 7-guide sleeve, 8-guide electrode, 9-iron core, 10-side shield, 11-bottom shield, 12-high voltage insulating cylinder, 13-high voltage copper wire, 14-primary aluminum cylinder, 15-arc shielding electrode, 16-iron core clamp, 17-low voltage copper wire, 18-low voltage insulating cylinder, 19-T-shaped arc support, 20-top insert, 21-support rod, 22-bottom support seat, 23-low voltage outer electrode, 24-n-V-shaped low voltage inner electrode, 25-secondary outlet terminal, 26-secondary outlet box, 27-explosion-proof sheet, 28-density meter, 29-bottom plate, 30-gas inlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the specification, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

With the development of an electric power system, in order to realize flexible control and protection of high-voltage direct-current transmission, a high-voltage direct-current circuit breaker is often adopted, and the complexity of the technology and the electrical structure of the high-voltage direct-current circuit breaker is far higher than that of a traditional alternating-current circuit breaker, so that all protection, measurement and control energy supply cannot be realized in a ground potential region like the alternating-current circuit breaker, and power supply needs of power supply transmission to a circuit breaker body side installed at a high potential through an energy supply transformer with high voltage isolation capability for power supply and control, protection and measurement of the circuit breaker body side are realized; further, since the installation and use of the circuit breaker body are limited, the power supply transformer must be installed in the vicinity of the circuit breaker body, that is, in the valve hall, and therefore, the oil-free design of the power supply transformer body is preferable.

In a specific embodiment of the present invention, as shown in fig. 1 to 3, the present invention specifically discloses a 500KV dc energy supply transformer for supplying power to a high-voltage dc circuit breaker, where the energy supply transformer includes a top plate 1, a silicon rubber bushing 2 and a housing 3, the top plate 1 is disposed at the top end of the silicon rubber bushing 2, the bottom end of the silicon rubber bushing 2 is fixed at the top of the housing 3, the silicon rubber bushing 2 is communicated with the inside of the housing 3, a primary lead tube 6 is disposed in the silicon rubber bushing 2, a plurality of air holes are disposed on the outer wall of the primary lead tube 6, the air holes are used for introducing insulating gas, the top of the primary lead tube 6 extends to the top plate 1 and is fixed inside the top plate 1, and the bottom of the primary lead tube 6 extends into the housing 3; a high-voltage outer electrode 4 is arranged on the outer side of the top plate 1, and an inverted-V-shaped high-voltage inner electrode 5 is arranged on the inner side of the top plate 1; a low-voltage outer electrode 23 is arranged on the outer side of the bottom end of the silicon rubber sleeve 2, a regular splayed low-voltage inner electrode 24 is arranged on the inner side of the bottom end of the silicon rubber sleeve, a primary wiring terminal is arranged at the top of the top plate 1, a lead enters the primary lead tube 6 after passing through the primary wiring terminal, and a high-voltage coil is connected to the bottom of the primary lead tube 6;

The bottom of the primary lead tube 6 is provided with a guide sleeve 7 and a guide electrode 8, the guide sleeve 7 is sleeved on the inner side of the bottom of the primary lead tube 6, the guide electrode 8 is sleeved on the outer side of the bottom of the primary lead tube 6, and the bottom of the guide sleeve 7 is fixed with the bottom of the guide electrode 8.

The high-voltage coil, the low-voltage coil, the iron core 9, the side shield 10 and the bottom shield 11 are arranged in the shell 3, a bottom plate 29 is arranged at the bottom in the shell 3, the bottom of the high-voltage coil is supported by two groups of supporting pieces, the two groups of supporting pieces are distributed at the bottom of the high-voltage coil in a splayed shape, each group of supporting pieces comprises a T-shaped arc supporting piece 19 made of an aluminum alloy material, a top insert 20 made of an aluminum alloy material, a supporting rod 21 made of a polytetrafluoroethylene insulating material and a bottom supporting seat 22 electroplated by a steel plate, the bottom supporting seat 21 is fixed on the bottom plate 29, the bottom of the supporting rod 21 is embedded on the bottom supporting seat 22, the bottom of the top insert 20 is embedded on the top of the supporting rod 21, the bottom of the T-shaped arc supporting piece 19 is embedded on the top insert 20, the top is supported on the outer side of the primary aluminum cylinder 14, and the bottom of the, the electric field distortion degree on the surface of the insulating part is smaller, the distribution is more uniform, the partial discharge level of a product is reduced, and the direct-current voltage resistance of the product is improved.

High-voltage coil includes high-voltage insulation section of thick bamboo 12, high-voltage copper line 13 and an aluminium section of thick bamboo 14, a top of aluminium section of thick bamboo 14 with the bottom of guide electrode 8 is fixed, an aluminium section of thick bamboo 14 and guide electrode 8 intercommunication once, high-voltage insulation section of thick bamboo 12 is poured on the inner wall of an aluminium section of thick bamboo 14 through epoxy, high-voltage copper line 13 winding is in on the high-voltage insulation section of thick bamboo 12, an aluminium section of thick bamboo 14's the outside is equipped with circular-arc shielding electrode 15 once.

The iron core 9 is fixed through iron core folder 16 on the bottom plate 29, iron core 9 and high-voltage coil parallel arrangement, low-voltage coil includes low voltage copper line 17 and low voltage insulation section of thick bamboo 18, the both ends of low voltage insulation section of thick bamboo 18 are fixed on the iron core folder 16, low voltage copper line 17 twines on the low voltage insulation section of thick bamboo 18, high-voltage coil is at same height with low-voltage coil's center, the side shield 10 sets up the side of iron core folder 16, end shield 11 sets up the lower part of iron core folder 16.

The outer side of the shell 3 is provided with a secondary outlet end 25, the secondary outlet end 25 is connected with the low-voltage coil, a secondary outlet box 26 is arranged outside the secondary outlet end 25, and the secondary outlet end 25 is used for accessing input voltage.

The transformer further comprises an explosion-proof sheet 27 and a gas inlet 30, wherein the explosion-proof sheet 27 and the gas inlet 30 are respectively arranged on the outer side of the shell, a density meter 28 is arranged on the outer side of the gas inlet 30, the gas inlet 30 is used for introducing sulfur hexafluoride insulating gas, the sulfur hexafluoride insulating gas is filled in the shell 3, the silicon rubber sleeve 2 and the primary lead tube 6, the density meter 28 is used for detecting the leakage condition of the sulfur hexafluoride insulating gas, and the explosion-proof sheet is used for reducing overpressure in the transformer.

The working process of the transformer comprises the following steps: the input voltage is connected from the secondary wire outlet end 25, after the low voltage coil is connected with the low voltage, the iron core 9 generates alternating current magnetic flux, the high voltage coil converts the connected low voltage into high voltage, and the high voltage is output by the primary wiring terminal through the lead; in the integral insulation and voltage-withstand part of the transformer, the main insulation is insulated by introducing gas sulfur hexafluoride, and the gas is introduced into the shell, the silicon rubber sleeve and the primary lead tube for insulation, so that the process steps of gas insulation are simpler, and the gas insulation has recoverability, namely, the gas can be automatically compounded after breakdown and decomposition, and the insulation is not influenced; the polytetrafluoroethylene insulating support piece is adopted at the bottom of the high-voltage coil, and the resistivity of the polytetrafluoroethylene and the sulfur hexafluoride is closer than that of the epoxy resin and the sulfur hexafluoride, so that the surface electric field of the polytetrafluoroethylene insulating piece in a direct-current field is more uniform, the insulating property is better, and the voltage resistance is higher.

The invention has the beneficial effects that: the energy supply transformer has the advantages of compact structure, reasonable arrangement, convenient maintenance, strong high-voltage resistance and excellent electrical and explosion-proof performance, adopts the inverted splayed high-voltage inner electrode, can improve the distribution of an internal electric field and an external electric field, captures internal suspended charged particles, restrains the internal suspended charged particles, reduces the aggregation of the charged particles on the positive electrode, and avoids discharge; the arc-shaped shielding electrode is arranged on the outer side of the high-voltage coil, and the bottom of the high-voltage coil is supported by an embedded polytetrafluoroethylene insulation supporting structure, so that the electric field distortion degree of the surface of an insulation part is smaller, the distribution is more uniform, the insulation property and the reliability of equipment are improved, the reliable operation of the equipment which can be stable for a long time is ensured, and the occurrence of the equipment failure rate is reduced.

while the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.