WO2020114265A1

WO2020114265A1 - Power transmission line pipeline and gas insulating line

Info

Publication number: WO2020114265A1
Application number: PCT/CN2019/120225
Authority: WO
Inventors: 马斌; 刘超; 周曙琛; 郁杰
Original assignee: 江苏神马电力股份有限公司
Priority date: 2018-12-03
Filing date: 2019-11-22
Publication date: 2020-06-11

Abstract

A power transmission line pipeline and a gas insulating line, the power transmission line pipeline comprising: three sub-pipelines that are sequentially insulatedly connected, each sub-pipeline comprising a metal case (140); and both ends of the power transmission line pipeline are grounded. In addition, the gas insulating line comprises several connected pipeline units (100), each pipeline unit (100) comprising an A-phase pipeline (110), a B-phase pipeline (120), and a C-phase pipeline (130), wherein three sets of intersectingly interconnected electrical circuits comprising A-phase sub-pipelines (112, 114, 116), B-phase sub-pipelines (122, 124, 126), and C-phase sub-pipelines (132, 134, 136) are formed between the three phases of pipelines. The gas insulating line interconnects three metal cases (140) having different phases and forms an electrical circuit with the ground, which may substantially offset induced electromotive force generated by the entire electrical circuit, reduce to a great extent induced current generated in the electrical circuit, reduce to a great extent heat generation by the metal cases, lower transformation loss, improve the safe operation of equipment, and improve the economic efficiency of a transformation system.

Description

Transmission line pipelines and gas insulated lines

Technical field

The invention relates to the technical field of transmission lines, in particular to a transmission line pipeline and a gas-insulated line.

Background technique

According to the requirements of special climate and geographical environment or the development needs of urban underground power transmission, gas-insulated lines are produced. It is a high-voltage, high-current power transmission equipment that uses insulated gas insulation and the coaxial arrangement of the housing and the conductor. Gas-insulated lines have the characteristics of no insulation aging, low loss, good safety protection, and small space occupation. They have advantages in large-capacity long-distance power transmission. Because the gas-insulated circuit is a pipeline closed structure, it can usually be directly buried, outdoor erection and tunnel installation. Therefore, the installation is very flexible for different natural environments. Compared with cables and overhead lines, conductors and shells have large cross-sectional areas and low resistance, so losses are relatively small. In addition, the capacitance is smaller than the cable, and even long-distance transmission does not require reactive power compensation and cooling system, and the operating cost is greatly reduced.

The traditional gas insulated circuit usually adopts a three-phase split structure, and each phase circuit includes a metal shell. Each phase operates independently. For the safety operation and operation inspection of the equipment, the metal shell is grounded at both ends of each phase line.

In the process of realizing the traditional technology, the applicant found that after the metal shell is grounded, the induced electromotive force along the metal shell will cause a large circulating current in the loop formed by the metal shell, the grounding wire and the ground, and the larger Circulation causes the metal case to heat up.

Summary of the invention

Based on this, it is necessary to provide a transmission line pipeline and a gas-insulated line in response to the problem that the large circulating current causes the metal case to generate heat.

A transmission line pipeline includes: three sub-pipes insulated and connected in sequence, each of the sub-pipes includes a metal shell, and both ends of the transmission line pipeline are grounded.

The above technical solution has at least the following technical effects: the transmission line pipeline provided by this technical solution includes three sub-pipes insulated and connected in sequence, so as to achieve electrical isolation between adjacent metal shells, and avoid the formation of metal shells, grounding conductors and earth The circuit reduces the heating of the metal shell.

The technical solution is further described below.

In one of the embodiments, two pot-type insulators are provided in the transmission line pipeline, and two ends of each pot-type insulator are provided with insulating flanges connecting adjacent metal shells.

In one of the embodiments, the transmission line pipe is divided into three sections by the two basin insulators.

In one of the embodiments, each of the sub-pipes further includes a composite material shell coated on the outside of the metal shell, and the composite material shell and the metal shell form a double-layer shell.

In one of the embodiments, the thickness of the composite shell is greater than the thickness of the metal shell.

A gas-insulated line includes a plurality of connected pipeline units. The pipeline unit includes: an A-phase pipeline, including three A-phase sub-pipes that are sequentially insulated and connected, and the three A-phase sub-pipes are sequentially the first A-phase sub A pipeline, a second A-phase sub-pipe, and a third A-phase sub-pipe; a B-phase pipe includes three B-phase sub-pipes insulated and connected in sequence, and the three B-phase sub-pipes are the first B-phase sub-pipe, the first Two B-phase sub-pipes and a third B-phase sub-pipe; the C-phase pipe includes three C-phase sub-pipes insulated and connected in sequence, and the three C-phase sub-pipes are a first C-phase sub-pipe and a second C-phase in turn Sub-pipe, third C-phase sub-pipe.

Wherein, each of the A-phase sub-pipes, each of the B-phase sub-pipes and each of the C-phase sub-pipes include a metal casing; the first A-phase sub-pipe and the third A-phase sub-pipe The pipe, the first phase B sub-pipe, the third phase B sub-pipe, the first phase C sub-pipe, and the third phase C sub-pipe are all grounded.

The metal shell of each of the A-phase sub-pipes and one metal shell of the B-phase sub-pipes and one metal shell of the C-phase sub-pipes are cross-connected with wires to form three groups all containing The electrical circuits of one phase A sub-pipe, one phase B sub-pipe and one phase C sub-pipe.

The above technical solution includes at least the following technical effects: In the gas-insulated line provided by the technical solution, a single pipeline unit includes three-phase transmission line pipelines, which are A-phase pipeline, B-phase pipeline, and C-phase pipeline, respectively. The three sub-pipes connected by insulation make electrical isolation between adjacent metal shells, avoiding the formation of loops between metal shells, grounding conductors and earth. Among them, the first A-phase sub-pipe, the third A-phase sub-pipe, the first B-phase sub-pipe, the third B-phase sub-pipe, the first C-phase sub-pipe, and the third C-phase sub-pipe are all grounded, and each A-phase sub-pipe The metal shell of the pipeline and the metal shell of a B-phase sub-pipe and the metal shell of a C-phase sub-pipe are cross-connected with wires to form three groups, each of which contains one A-phase sub-pipe and one B-phase The electrical circuit of the sub-pipe and one C-phase sub-pipe, according to the theory of electromagnetic field, the phase difference between the induced electromotive force generated by the A-phase pipe, B-phase pipe and C-phase pipe on the metal shell is 120 degrees each. The induced electromotive forces generated by the three sub-pipes of one phase are approximately the same. Interconnecting three metal shells of different phases and forming an electrical circuit with the ground can basically cancel the induced electromotive forces generated by the entire electrical circuit, which greatly reduces the electrical circuit. The induced current generated reduces the heating phenomenon of the metal shell to a large extent, reduces the power loss, and improves the safe operation of the equipment.

The technical solution is further described below.

In one embodiment, the first phase A sub-pipe is electrically connected to the second phase B sub-pipe, and the second phase B sub-pipe is electrically connected to the third phase C sub-pipe; the first A phase B sub-pipe is electrically connected to the second phase C sub-pipe, the second phase C sub-pipe is electrically connected to the third phase A sub-pipe; the first phase C sub-pipe is connected to the second The phase A sub-pipe is electrically connected, and the second phase A sub-pipe is electrically connected to the third phase B sub-pipe.

In one of the embodiments, the first phase A sub-pipe is electrically connected to the second phase C sub-pipe, and the second phase C sub-pipe is electrically connected to the third phase B sub-pipe; the first A phase B sub-pipe is electrically connected to the second phase A sub-pipe, the second phase A sub-pipe is electrically connected to the third phase C sub-pipe; the first phase C sub-pipe is connected to the second The phase B sub-pipe is electrically connected, and the second phase B sub-pipe is electrically connected to the third phase A sub-pipe.

In one embodiment, between two interconnected sub-pipes of different phases, the wires are electrically connected to the ends of the two closest metal shells.

In one of the embodiments, the A-phase pipe, the B-phase pipe and the C-phase pipe are parallel to each other, each of the A-phase sub-pipes, each of the B-phase sub-pipes and each of the C The positions of the phase channels correspond to each other in sequence.

In one of the embodiments, two pot-type insulators are provided in the A-phase pipe, the B-phase pipe, and the C-phase pipe, and both ends of each of the pot-type insulators are provided Insulating flanges connected to the adjacent metal shells.

In one of the embodiments, the A-phase pipe, the B-phase pipe and the C-phase pipe are all divided into three sections by the two basin insulators.

In one of the embodiments, each of the A-phase sub-pipes, each of the B-phase sub-pipes, and each of the C-phase sub-pipes further includes a composite material shell coated on the outside of the metal shell , The composite material shell and the metal shell form a double-layer shell.

BRIEF DESCRIPTION

1 is a schematic diagram of a pipeline unit in a gas insulated circuit according to an embodiment of the invention;

2 is a schematic diagram of a pipeline unit in a gas insulated circuit according to another embodiment of the present invention.

FIG. 3 is a partial structural diagram of a double-layer shell according to an embodiment of the invention.

Among them: 100, pipeline unit 110, phase A pipeline 112, the first phase A sub-pipe

114. Second A-phase sub-pipe 116, Third A-phase sub-pipe

120. Phase B pipeline 122, the first phase B pipeline

124. Second B-phase sub-pipe 126, Third B-phase sub-pipe

130, Phase C pipeline 132, the first phase C pipeline

134, the second phase C sub-pipe 136, the third phase C sub-pipe

140, metal shell 142, composite material shell

150, conductor 160, basin insulator

170. Insulation flange 180, wire

detailed description

In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can be implemented in many other ways than those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be a centered element. When an element is considered to be "connected" to another element, it may be directly connected to another element or there may be a center element at the same time.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terminology used in the description of the present invention herein is for the purpose of describing specific embodiments, and is not intended to limit the present invention. The term "and/or" as used herein includes any and all combinations of one or more related listed items.

An embodiment of the present invention provides a transmission line pipeline, including: three sub-pipes insulated and connected in sequence, each sub-pipe includes a metal shell, and both ends of the transmission line pipeline are grounded. The insulation connection between adjacent metal shells can achieve electrical isolation, avoiding the formation of loops between the metal shells, grounding conductors and the ground.

Specifically, the transmission line pipeline further includes a conductor provided in the metal case, and an insulating gas provided between the metal case and the conductor to form a closed space filled with the insulating gas. The conductor is made of a material with electrical conductivity and has the function of transmitting current, such as aluminum alloy material and metallic copper material. The insulating gas can be SF ₆ gas or SF ₆ -N ₂ mixed gas. When an arc occurs inside the metal shell, it will not explode and burn, which is beneficial to fire prevention. The metal shell can be made of aluminum alloy to play a shielding role.

The technical solution is further described below.

In some embodiments, two pot-type insulators are provided in the transmission line pipeline, and two ends of each pot-type insulator are provided with insulating flanges connecting adjacent metal shells. The pot-type insulator is placed between adjacent sub-pipes, the conductor is located roughly in the middle of the pot-type insulator, the pot-type insulator plays a supporting role for the conductor, and keeps the conductor and the metal shell coaxial, avoiding the conductor and the metal shell Contact occurred. The two ends of the basin insulator are respectively fixed with insulating flanges connecting adjacent metal shells. The insulating flanges use insulating materials, such as epoxy materials, rubber, asbestos, ceramics, etc., to electrically isolate the adjacent metal shells. Avoid forming loops in the metal case, grounding conductor and earth.

Further, the transmission line pipeline is divided into three sections by two basin insulators. Generally, each sub-pipe is approximately 500 meters long, and the length of a single transmission line pipe is approximately 1500 meters. Of course, for practical production and application requirements, the length of a single transmission line pipe and each sub-pipe can also be set to other suitable values.

When the traditional gas-insulated circuit adopts a three-phase split structure, a large current passes through each phase of the transmission line pipeline during operation. According to the principle of electromagnetic induction, a certain induced electromotive force is induced on the metal casing. For the safe operation of the equipment and operation inspection, the metal casing is grounded at both ends of each phase of the transmission line pipeline, resulting in the induced electromotive force along the metal casing between the metal casing, the grounding conductor and the ground It forms a loop and generates a large circulating current. Due to the short distance between the conductor and the metal shell, the electromagnetic induction effect is more significant. The circulating current usually generated in the metal shell is about 80% of the conductor current, which further leads to the metal shell The body heats up and the transformer loss increases, which is not conducive to the safe and stable operation of the equipment and damages the economy of the transformer system.

To this end, please refer to FIGS. 1 and 2, an embodiment of the present invention provides a gas-insulated circuit, including a plurality of connected pipeline units 100, the pipeline unit 100 includes: A-phase pipeline 110, including three A connected in turn insulated Phase sub-pipe, the three A-phase sub-pipes are the first A-phase sub-pipe 112, the second A-phase sub-pipe 114, and the third A-phase sub-pipe 116; the B-phase pipe 120 includes three B-phases which are insulated and connected in sequence Sub-pipes, three B-phase sub-pipes are first B-phase sub-pipe 122, second B-phase sub-pipe 124, and third B-phase sub-pipe 126; C-phase pipe 130 includes three C-phase subs insulated in sequence The three C-phase sub-pipes are the first C-phase sub-pipe 132, the second C-phase sub-pipe 134, and the third C-phase sub-pipe 136 in sequence.

Wherein, each A-phase sub-pipe, each B-phase sub-pipe and each C-phase sub-pipe include a metal housing 140; a first A-phase sub-pipe 112, a third A-phase sub-pipe 116, and a first B-phase sub The pipe 122, the third B-phase sub-pipe 126, the first C-phase sub-pipe 132, and the third C-phase sub-pipe 136 are all grounded. The metal shell 140 of each A-phase sub-pipe and the metal shell 140 of a B-phase sub-pipe and the metal shell 140 of a C-phase sub-pipe are interconnected by wires 180, forming three groups each containing one The electrical circuits of the A-phase sub-pipe and one B-phase sub-pipe and one C-phase sub-pipe.

According to the principle of electromagnetic induction, the phase difference of the three-phase circuit is 120 degrees, and the instantaneous electromotive force vector sum after the three-phase circuit is cross-connected is zero. In the embodiment of the present invention, the three sub-pipes of each phase have the same induced electromotive force without considering the transformer loss, and the three sub-pipes of the same phase have the same induced electromotive force when considering the actual transformer losses. The induced electromotive force of the pipeline gradually decreases along the direction of the current. Therefore, in the embodiment of the present invention, it can be understood that the induced electromotive force of three sub-pipes of the same phase is approximately the same, and the sum of the instantaneous induced electromotive force after the three sub-pipes of different phases are cross-connected is approximately zero.

A-phase pipeline 110, B-phase pipeline 120, and C-phase pipeline 130, each phase pipeline includes three sub-pipes that are insulated and connected in sequence, so that adjacent metal shells 140 are electrically isolated, avoiding metal shell 140 and grounding conductors 180 and the earth form a loop. The first phase A sub-pipe 112, the third phase A sub-pipe 116, the first phase B sub-pipe 122, the third phase B sub-pipe 126, the first phase C sub-pipe 132, and the third phase C sub-pipe 136 are all grounded. The metal shell 140 of each A-phase sub-pipe and the metal shell 140 of a B-phase sub-pipe and the metal shell 140 of a C-phase sub-pipe are interconnected by wires 180, forming three groups each containing one The electrical circuits of the A-phase sub-pipe and one B-phase sub-pipe and one C-phase sub-pipe. That is, the grounded one-phase sub-pipe is electrically connected to the ungrounded one-phase sub-pipe, and then to the grounded one-phase sub-pipe, and the three sub-pipes belong to different phases, forming three groups whose instantaneous electromotive force sum is approximately zero The electric circuit reduces the circulating current in the electric circuit, reduces the heating of the metal shell 140, and improves the safety of the device.

It should be noted that, in the embodiment of the present invention, the A-phase pipeline 110, the B-phase pipeline 120, and the C-phase pipeline 130 use the transmission line pipeline as described above, and the A-phase pipeline 110, the B-phase pipeline 120, and the C-phase pipeline Each 130 also includes a conductor 150 provided in the metal housing 140 and an insulating gas provided between the metal housing 140 and the conductor 150 to form a closed space filled with the insulating gas. The conductor 150 is made of a material with electrical conductivity and has a function of transmitting electric current, such as aluminum alloy material and metallic copper material. The insulating gas can be SF ₆ gas or SF ₆ -N ₂ mixed gas. When an arc occurs inside the metal shell 140, it will not explode and burn, which is beneficial to fire prevention. The metal shell 140 may be made of aluminum alloy to play a shielding role.

In addition, the gas-insulated line may be a gas-insulated transmission line (GIL, Gas Insulated) Line, a gas-insulated bus (GIB, Gas Insulated) Bus, etc. The gas-insulated circuit can be used in substations or other power transmission devices, which can reduce the circulating current generated by electromagnetic induction, reduce the heating of the metal shell 140, and reduce the power loss.

The above technical solution includes at least the following technical effects: In the gas-insulated line provided by the technical solution, a single pipeline unit 100 includes three-phase transmission line pipelines, which are A-phase pipeline 110, B-phase pipeline 120, and C-phase pipeline 130, each phase The pipelines each include three sub-pipes that are insulated and connected in sequence, so that electrical isolation between adjacent metal shells 140 is realized, and the metal shells 140, grounding conductors, and the ground are prevented from forming a loop. Among them, the first A-phase sub-pipe 112, the third A-phase sub-pipe 116, the first B-phase sub-pipe 122, the third B-phase sub-pipe 126, the first C-phase sub-pipe 132, and the third C-phase sub-pipe 136 are all grounded , The metal shell 140 of each A-phase sub-pipe and the metal shell 140 of one B-phase sub-pipe and the metal shell 140 of one C-phase sub-pipe are interconnected by wires 180, forming three groups each containing 1 The electrical circuits of one A-phase sub-pipe, one B-phase sub-pipe and one C-phase sub-pipe, according to the theory of electromagnetic field, since the A-phase pipe 110, B-phase pipe 120 and C-phase pipe 130 are located on the metal shell 140 The phases between the induced electromotive forces generated are different by 120 degrees, and the induced electromotive forces generated by the three sub-pipes of each phase are approximately the same. Interconnecting three metal shells 140 of different phases and forming an electrical circuit with the ground can basically cancel each other out. The induced electromotive force generated by the electrical circuit greatly reduces the induced current generated in the electrical circuit, greatly reduces the heating phenomenon of the metal shell 140, reduces the power loss, improves the safe operation of the equipment, and improves the economy of the power system .

The technical solution is further described below.

Referring to FIG. 1, in some embodiments, the first phase A sub-pipe 112 is electrically connected to the second phase B sub-pipe 124, the second phase B sub-pipe 124 is electrically connected to the third phase C sub-pipe 136; the first phase B The sub-pipe 122 is electrically connected to the second C-phase sub-pipe 134, the second C-phase sub-pipe 134 is electrically connected to the third A-phase sub-pipe 116; the first C-phase sub-pipe 132 is electrically connected to the second A-phase sub-pipe 114, The second A-phase sub-pipe 114 is electrically connected to the third B-phase sub-pipe 126. With this arrangement, it is possible to form a first phase A sub-pipe 112 grounded to the second phase B sub-pipe 124, a third phase C sub-pipe 136 electrically connected to ground, and a first phase B sub-pipe 122 grounded Electrically connected to the second phase C sub-pipe 134, then to the third phase A sub-pipe 116, from the grounded first phase C sub-pipe 132 to the second phase A sub-pipe 114, and then to the third Three sets of electrical circuits of the B-phase sub-pipe 126. The sum of the instantaneous induced electromotive force vectors of the three sets of electrical circuits is approximately zero.

Specifically, there are many ways to connect electrical circuits. For example, according to the orientation shown in FIG. 1, the lower right end of the metal casing 140 of the first A-phase sub-pipe 112 is electrically connected to the upper left end of the metal casing 140 of the second B-phase sub-pipe 124, and the second B-phase The lower right end of the metal casing 140 of the sub-pipe 124 is electrically connected to the upper left end of the metal casing 140 of the third C-phase sub-pipe 136, forming a first group of electrical circuits. The lower right end of the metal housing 140 of the first B-phase sub-pipe 122 is electrically connected to the upper left end of the metal housing 140 of the second C-phase sub-pipe 134, and the lower right end of the metal housing 140 of the second C-phase sub-pipe 134 is electrically The upper left end of the metal housing 140 connected to the first A-phase sub-pipe 112 forms a second set of electrical circuits. The lower right end of the metal housing 140 of the first C-phase sub-pipe 132 is electrically connected to the upper left end of the metal housing 140 of the second A-phase sub-pipe 114, and the lower right end of the metal housing 140 of the second A-phase sub-pipe 114 is electrically The upper left end of the metal housing 140 connected to the third B-phase sub-pipe 126. Since each phase sub-pipe has a certain length, this connection method greatly shortens the length of the wire 180, saves the consumption of the wire 180, and at the same time, avoids cross interference between the multiple wires 180.

Referring to FIG. 2, in some other embodiments, the first phase A sub-pipe 112 is electrically connected to the second phase C sub-pipe 134, and the second phase C sub-pipe 134 is electrically connected to the third phase B sub-pipe 126; the first B The phase sub-pipe 122 is electrically connected to the second phase A sub-pipe 114, the second phase A sub-pipe 114 is electrically connected to the third phase C sub-pipe 136; the first phase C sub-pipe 132 is electrically connected to the second phase B sub-pipe 124 The second phase B sub-pipe 124 is electrically connected to the third phase A sub-pipe 116. With this arrangement, it is possible to form a first B-phase sub-pipe 112 that is electrically connected to the second C-phase sub-pipe 134 from the ground, a third B-phase sub-pipe 126 that is electrically connected to the ground, and a first B-phase sub-pipe 122 from the ground Electrically connected to the second A-phase sub-pipe 114, and then to the third C-phase sub-pipe 136, from the grounded first C-phase sub-pipe 132 to the second B-phase sub-pipe 124, and then to the third Three sets of electrical circuits of the A-phase sub-pipe 116. The sum of the instantaneous induced electromotive force vectors of the three sets of electrical circuits is approximately zero.

Specifically, there are many ways to connect electrical circuits. For example, according to the orientation shown in FIG. 2, the lower right end of the metal housing 140 of the first A-phase sub-pipe 112 is electrically connected to the upper left end of the metal housing 140 of the second C-phase sub-pipe 134, and the second C-phase The lower right end of the metal casing 140 of the sub-pipe 134 is electrically connected to the lower left end of the third B-phase sub-pipe 126, forming a first set of electrical circuits. The upper right end of the metal housing 140 of the first B-phase sub-pipe 122 is electrically connected to the upper left end of the metal housing 140 of the second A-phase sub-pipe 114, and the lower right end of the metal housing 140 of the second A-phase sub-pipe 114 is electrically Connected to the upper left end of the third phase C sub-pipe 136, forming a second set of electrical circuits. The upper right end of the metal housing 140 of the first C-phase sub-pipe 132 is electrically connected to the lower left end of the metal housing 140 of the second B-phase sub-pipe 124, and the upper right end of the metal housing 140 of the second B-phase sub-pipe 124 is electrically The lower left end of the metal housing 140 connected to the third A-phase sub-pipe 116 forms a third set of electrical circuits. Since each phase sub-pipe has a certain length, this connection method greatly shortens the length of the wire 180, saves the consumption of the wire 180, and at the same time, avoids cross interference between the multiple wires 180.

In the above two electrical circuits, between two interconnected sub-pipes of different phases, the wire 180 is electrically connected to the ends of the two closest metal shells 140. In the embodiment of the present invention, the wire 180 is drawn out from the end of the connection of the adjacent metal shell 140. In order to save the angle of the wire 180 and facilitate the connection, under the premise of avoiding the cross interference of the multiple wires 180 as much as possible, the two metal shells that are closest to each other are usually connected between adjacent or adjacent sub-pipes of different phases 140 end. Of course, this does not limit the connection method of the electrical circuit in the embodiments of the present invention.

In some embodiments, the A-phase pipe 110, the B-phase pipe 120, and the C-phase pipe 130 are parallel to each other, and the positions of each A-phase sub-pipe, each B-phase sub-pipe, and each C-phase sub-pipe correspond in sequence. Specifically, the first A-phase sub-pipe 112 is aligned with the first B-phase sub-pipe 122, the first B-phase sub-pipe 122 is aligned with the first C-phase sub-pipe 132, and the second A-phase sub-pipe 114 is aligned with the second B-phase sub-pipe The pipe 124 is aligned, the second B-phase sub-pipe 124 is aligned with the second C-phase sub-pipe 134, the third A-phase sub-pipe 116 is aligned with the third B-phase sub-pipe 126, and the third B-phase sub-pipe 126 is aligned with the third C-phase The sub-pipes 136 are aligned. With this setting, the connection operation between adjacent sub-pipes is more convenient in the actual application process, saving installation time and reducing labor costs.

In some embodiments, two pot insulators 160 are provided in the A-phase pipe 110, the B-phase pipe 120, and the C-phase pipe 130, and the two ends of each pot-type insulator 160 are provided to connect adjacent metals The insulating flange 170 of the housing 140. The pot insulator 160 is disposed between adjacent sub-pipes, the conductor 150 is located approximately in the middle of the pot insulator 160, the pot insulator 160 supports the conductor 150, and keeps the conductor 150 coaxial with the metal housing 140 To avoid contact between the conductor 150 and the metal housing 140. The two ends of the basin insulator 160 are respectively fixed with an insulating flange 170 connected to the adjacent metal shell 140. The insulating flange 170 uses an insulating material, such as epoxy material, rubber, asbestos, ceramics, etc. The 140 is electrically isolated to prevent the metal case 140, the ground wire and the earth from forming a loop.

Further, the A-phase pipe 110, the B-phase pipe 120, and the C-phase pipe 130 are all divided into three sections by two basin insulators 160. Generally, each A-phase sub-pipe, each B-phase sub-pipe and each C-phase sub-pipe are approximately 500 meters long, and the length of a single pipe unit 100 is approximately 1500 meters. In this way, to a certain extent, the difference between the induced electromotive force caused by the transformer loss and the theoretical induced electromotive force can be reduced, so as to make the induced electromotive force between each phase sub-pipe of the cross-connected as much as possible cancel each other out. Of course, for practical production application requirements, the length of the single pipe unit 100 and each sub-pipe can also be set to other suitable values.

In the gas-insulated circuit provided by the embodiment of the present invention, a single pipeline unit 100 includes a three-phase transmission line pipeline, electrically separating the metal shells 140 adjacent to each phase, and then adopting three metal shells 140 of different phases The wires 180 are cross-connected to form three sets of electrical circuits that include phase A sub-pipes, phase B sub-pipes, and phase C sub-pipes, so that the induced electromotive forces of different phases roughly cancel each other, reducing the induced current in the electrical loop and reducing the metal shell. The 140 heat generation reduces the loss of substations, which is conducive to the safe operation of equipment and improves the economy of substation systems.

Based on the foregoing transmission line pipeline embodiment, an embodiment of the present invention also provides another transmission line pipeline. Unlike the foregoing embodiment, the sub-pipe adopts a double-layer shell.

Specifically, in this embodiment, the transmission line pipeline includes: three sub-pipes insulated and connected in sequence, and each of the sub-pipes includes a double-layer shell. The double-layer shell includes a metal shell and a metal shell Composite material shell, and both ends of the transmission line pipe are grounded. The insulation connection between adjacent metal shells can achieve electrical isolation, avoiding the formation of loops between the metal shells, grounding conductors and the ground.

Specifically, the transmission line pipeline further includes a conductor provided in the metal case, and an insulating gas provided between the metal case and the conductor to form a closed space filled with the insulating gas. The conductor is made of a material with electrical conductivity and has the function of transmitting current, such as aluminum alloy material and metallic copper material. The insulating gas can be SF ₆ gas or SF ₆ -N ₂ mixed gas. When an arc occurs inside the metal shell, it will not explode and burn, which is beneficial to fire prevention. The metal shell can be made of aluminum alloy to play a shielding role. The composite material shell plays a protective role. At the same time, the composite material shell is lighter in weight, which can reduce the weight of the transmission line pipeline and reduce the cost of raw materials. In this embodiment, the composite material shell may be composed of a glass fiber yarn as a reinforcing material and a matrix material, and the matrix material may be epoxy resin, vinyl ester resin, polyurethane resin, or the like. Of course, the above materials are only for reference of the embodiments, and do not limit other embodiments of the present invention.

The technical solution for the composite material shell is further described below.

In some embodiments, the thickness of the composite shell is greater than the thickness of the metal shell. In order to reduce the heating phenomenon of the metal shell as much as possible, the traditional double-layer shell usually has a larger cross-sectional area, which results in a thinner composite shell and a thicker metal shell. The price is higher than the composite material, so the economic benefit of the double-layer shell is not significant compared to the single-layer metal layer. This embodiment can reduce the thickness of the metal shell to a greater extent on the basis of reducing the heating of the metal shell. The thickness of the composite material shell can be greater than the thickness of the metal shell, which not only reduces the weight of the transmission line pipeline, but also improves To improve economy and reduce costs. Of course, the thickness of the composite material shell may not be greater than the thickness of the metal shell, and only the thickness ratio of the composite material shell may be increased.

The remaining structure of the transmission line pipeline in this embodiment is the same as the foregoing transmission line pipeline embodiment, which will not be repeated here.

On the basis of the foregoing gas-insulated line embodiment, an embodiment of the present invention also provides another gas-insulated transmission line. Unlike the previous embodiment, the sub-pipe adopts a double-layer shell.

Specifically, please continue to refer to FIGS. 1 and 2. In this embodiment, the gas-insulated transmission line includes several connected pipeline units 100. The pipeline unit 100 includes: an A-phase pipeline 110, including three A-phase sub-pipes that are sequentially insulated and connected , The three A-phase sub-pipes are the first A-phase sub-pipe 112, the second A-phase sub-pipe 114, and the third A-phase sub-pipe 116 in sequence; the B-phase pipe 120 includes three B-phase sub-pipes that are sequentially insulated and connected, The three B-phase sub-pipes are, in order, a first B-phase sub-pipe 122, a second B-phase sub-pipe 124, and a third B-phase sub-pipe 126; a C-phase pipe 130 includes three C-phase sub-pipes that are insulated and connected in sequence, three The C-phase sub-pipes are a first C-phase sub-pipe 132, a second C-phase sub-pipe 134, and a third C-phase sub-pipe 136 in sequence.

Wherein, referring to FIG. 3, each A-phase sub-pipe, each B-phase sub-pipe and each C-phase sub-pipe include a double-layer shell, the double-layer shell includes a metal shell 140 and a metal shell 140 Outer composite housing 142; first A-phase sub-pipe 112, third A-phase sub-pipe 116, first B-phase sub-pipe 122, third B-phase sub-pipe 126, first C-phase sub-pipe 132, third The phase C sub-pipes 136 are all grounded. The metal shell 140 of each A-phase sub-pipe and the metal shell 140 of a B-phase sub-pipe and the metal shell 140 of a C-phase sub-pipe are interconnected by wires 180, forming three groups each containing one The electrical circuits of the A-phase sub-pipe and one B-phase sub-pipe and one C-phase sub-pipe.

It should be noted that, in this embodiment, the A-phase pipeline 110, the B-phase pipeline 120, and the C-phase pipeline 130 use the transmission line pipeline as described above, and the A-phase pipeline 110, the B-phase pipeline 120, and the C-phase pipeline 130 are all It also includes a conductor 150 provided in the metal case 140 and an insulating gas provided between the metal case 140 and the conductor 150 to form a closed space filled with the insulating gas. The conductor 150 is made of a material with electrical conductivity and has a function of transmitting current, such as aluminum alloy material. The insulating gas can be SF ₆ gas or SF ₆ -N ₂ mixed gas. When an arc occurs inside the metal shell 140, it will not explode and burn, which is beneficial to fire prevention. The metal shell 140 may be made of aluminum alloy to play a shielding role. The composite material shell 142 plays a protective role. At the same time, the composite material shell 142 is light in weight, which can reduce the weight of the transmission line pipeline and reduce the cost of raw materials. In this embodiment, the composite material shell 142 may be composed of a glass fiber yarn as a reinforcing material and a matrix material, and the matrix material may be epoxy resin, vinyl ester resin, polyurethane resin, or the like. Of course, the above materials are only for reference of the embodiments, and do not limit other embodiments of the present invention.

The technical solution for the composite material shell 142 is further described below.

Referring to FIG. 3, in some embodiments, the thickness of the composite housing 142 is greater than the thickness of the metal housing 140. In order to reduce the heating phenomenon of the metal shell as much as possible, the traditional double-layer shell usually has a larger cross-sectional area, which results in a thinner composite shell and a thicker metal shell. The price is higher than the composite material, so the economic benefit of the double-layer shell is not significant compared to the single-layer metal layer. This embodiment can reduce the thickness of the metal shell 140 to a greater extent on the basis of reducing the heat generation of the metal shell 140. The thickness of the composite material shell 142 can be greater than the thickness of the metal shell 140, which not only reduces the transmission line pipeline Weight, while improving economics and reducing costs. Of course, the thickness of the composite material shell 142 may not be greater than the thickness of the metal shell 140, and only the thickness ratio of the composite material shell 142 may be increased.

The remaining structure of the gas-insulated circuit in this embodiment is the same as that of the foregoing gas-insulated circuit embodiment, which will not be repeated here.

The technical features of the above embodiments can be arbitrarily combined. To simplify the description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be It is considered to be within the scope of this description.

The above examples only express several embodiments of the present invention, and their descriptions are more specific and detailed, but they should not be construed as limiting the patent scope of the invention. It should be noted that, for a person of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all fall within the protection scope of the present invention. Therefore, the protection scope of the invention patent shall be subject to the appended claims.

Claims

A transmission line pipeline is characterized by comprising: three sub-pipes insulated and connected in sequence, each of the sub-pipes includes a metal shell, and both ends of the transmission line pipeline are grounded.
The transmission line pipeline according to claim 1, wherein two pot-type insulators are provided in the power-transmission line pipe, and two ends of each pot-type insulator are provided to connect adjacent metal shells Insulation flange of the body.
The transmission line pipeline according to claim 2, wherein the transmission line pipeline is equally divided into three sections by two of the basin insulators.
The transmission line pipeline according to claim 1, wherein each of the sub-pipes further includes a composite material shell coated on the outer side of the metal shell, the composite material shell and the metal shell The body forms a double shell.
The transmission line pipeline according to claim 4, wherein the thickness of the composite material shell is greater than the thickness of the metal shell.
A gas-insulated line includes several connected pipeline units, characterized in that the pipeline units include:

The A-phase pipeline includes three A-phase sub-pipes insulated and connected in sequence, and the three A-phase sub-pipes are a first A-phase sub-pipe, a second A-phase sub-pipe, and a third A-phase sub-pipe in sequence;

The B-phase pipeline includes three B-phase sub-pipes insulated and connected in sequence, and the three B-phase sub-pipes are a first B-phase sub-pipe, a second B-phase sub-pipe, and a third B-phase sub-pipe in sequence;

The phase C pipeline includes three phase C sub-pipes insulated and connected in sequence, and the three phase C sub-pipes are a first phase C sub-pipe, a second phase C sub-pipe, and a third phase C sub-pipe in sequence;

Wherein, each of the A-phase sub-pipes, each of the B-phase sub-pipes and each of the C-phase sub-pipes include a metal casing; the first A-phase sub-pipe and the third A-phase sub-pipe The pipeline, the first B-phase sub-pipe, the third B-phase sub-pipe, the first C-phase sub-pipe, and the third C-phase sub-pipe are all grounded;

The metal shell of each of the A-phase sub-pipes and one metal shell of the B-phase sub-pipes and one metal shell of the C-phase sub-pipes are cross-connected with wires to form three groups all containing The electrical circuits of one phase A sub-pipe, one phase B sub-pipe and one phase C sub-pipe.
The gas insulated circuit according to claim 6, wherein the first A-phase sub-pipe is electrically connected to the second B-phase sub-pipe, and the second B-phase sub-pipe is connected to the third C-phase Sub-pipes are electrically connected; the first B-phase sub-pipe is electrically connected to the second C-phase sub-pipe, the second C-phase sub-pipe is electrically connected to the third A-phase sub-pipe; the first C The phase sub-pipe is electrically connected to the second phase A sub-pipe, and the second phase A sub-pipe is electrically connected to the third phase B sub-pipe.
The gas insulated circuit according to claim 6, wherein the first A-phase sub-pipe is electrically connected to the second C-phase sub-pipe, and the second C-phase sub-pipe is connected to the third B-phase Sub-pipes are electrically connected; the first B-phase sub-pipe is electrically connected to the second A-phase sub-pipe, the second A-phase sub-pipe is electrically connected to the third C-phase sub-pipe; the first C The phase sub-pipe is electrically connected to the second phase B sub-pipe, and the second phase B sub-pipe is electrically connected to the third phase A sub-pipe.
The gas insulated circuit according to any one of claims 6 to 8, characterized in that between two interconnected sub-pipes of different phases, the wires are electrically connected to the ends of the two closest metal shells .
The gas insulated circuit according to claim 6, wherein the A-phase pipe, the B-phase pipe and the C-phase pipe are parallel to each other, each of the A-phase sub-pipes, each of the B-phase The positions of the sub-pipes and each of the C-phase sub-pipes correspond in sequence.
The gas insulated circuit according to claim 6, wherein two pot-type insulators are provided in the A-phase pipe, the B-phase pipe, and the C-phase pipe, and each of the basins Both ends of the type insulator are provided with insulating flanges connecting adjacent metal shells.
The gas insulated circuit according to claim 6, characterized in that the A-phase pipe, the B-phase pipe and the C-phase pipe are all divided into three sections by two basin insulators.
The gas insulated circuit according to claim 6, characterized in that each of the A-phase sub-pipes, each of the B-phase sub-pipes, and each of the C-phase sub-pipes further include a coating on the metal A composite material shell outside the shell, the composite material shell and the metal shell forming a double-layer shell.
The gas insulated circuit according to claim 13, wherein the thickness of the composite material shell is greater than the thickness of the metal shell.