WO2019024291A1

WO2019024291A1 - Gil power transmission system, power transmission line and grounding switch

Info

Publication number: WO2019024291A1
Application number: PCT/CN2017/108896
Authority: WO
Inventors: 王赛豪; 段晓辉; 杜迎乾; 孙英杰; 陈轩; 刘贞瑶; 占小猛; 董祥渊; 柴影辉; 秦政敏; 刘宇; 朱苛娄; 郭良超; 郭东方; 孙琼
Original assignee: 平高集团有限公司; 国家电网公司; 国网江苏省电力公司检修分公司
Priority date: 2017-08-01
Filing date: 2017-11-01
Publication date: 2019-02-07
Also published as: CN109326478B; CN109326478A

Abstract

A GIL power transmission system, power transmission line and grounding switch. The GIL power transmission system comprises a power transmission line, the power transmission line comprising a sleeve and a power transmission conductor provided within the sleeve. On the power transmission line is provided an earthed switch for, when the power transmission line disconnects, earthing the power transmission conductor, then releasing an induction current and induction voltage on the power transmission conductor. By means of the grounding switch, when the GIL power transmission line experiences a fault and disconnects, the invention can timely connect the power transmission conductor to ground, thereby timely releasing the induction current and induction voltage on the power transmission conductor, avoiding damage to an apparatus caused by the induction current and induction voltage on the power transmission conductor, and enabling the safe operation of the entire GIL power transmission system.

Description

GIL transmission system, transmission line and grounding switch

Cross-reference to related applications

This patent application claims priority to Chinese Patent Application No. JP-A No. No. No. No. No. No. No. No. No. No. No. No.

Technical field

The invention relates to a GIL transmission system, a transmission line and a grounding switch.

Background technique

In the field of power grid transmission, there are ubiquitous multi-circuit transmission lines. When one of the transmission lines fails and is shut down for maintenance, due to electrostatic induction and electromagnetic coupling, large induced currents and inductions will occur in the fault circuit. Voltage, the voltage and current generated by this induction not only cause harm to the equipment, but also easily cause electric shock accidents on the spot, which brings risks to the safe production and operation of the power grid.

With the development of China's electric power industry, the transmission voltage level and transmission capacity are gradually increasing. In order to meet the high voltage and high capacity transmission requirements, GIL transmission systems are gradually being used. For example, Huainan-Nanjing-Shanghai, which is scheduled to be put into operation in 2019. The Sutong GIL Integrated Pipe Gallery project of UHV AC transmission and transformation project is the world's first transmission project using GIL transmission technology in the construction of UHV projects.

The GIL transmission system adopts gas-insulated metal-enclosed transmission technology. The transmission line includes a casing. The casing is internally provided with a transmission conductor for carrying current, and the casing is also provided with an insulating gas for achieving gas insulation between the transmission conductor and the casing. The casing is connected to the ground to achieve grounding. The GIL uses the transmission conductor for current transmission, which greatly improves the current transmission capability of the transmission line. However, the existing GIL transmission technology only grounds the casing, and there is no internal transmission conductor. The effective protective measures cause the induced current and induced voltage generated on the internal power transmission conductor to be released when the GIL transmission line is cut off, which poses a great risk to the operation of the GIL transmission system.

Summary of the invention

The object of the present invention is to provide a GIL transmission system capable of releasing the induced current and the induced voltage on the power transmission conductor in time to ensure the safe operation of the system; and the object of the present invention is to provide a transmission line used in the above GIL transmission system and Used to set the grounding switch on the power line.

To achieve the above object, a technical solution of a GIL power transmission system according to an embodiment of the present invention is: a GIL power transmission system including a power transmission line, the power transmission line including a casing and a power transmission conductor disposed in the casing, A grounding switch for grounding the power transmission conductor and releasing an induced current and an induced voltage on the power transmission conductor after the power transmission line is disconnected is provided on the power transmission line.

The grounding switch is connected in series on the power transmission line, and comprises a cylinder connected to the sleeve. The cylinder body is provided with a static contact electrically connected to the power transmission conductor, and the grounding switch further comprises a movable contact electrically connected to the ground, the movement The contact end of the contact extends into the barrel and is driven by the operating mechanism to effect contact and separation with the stationary contact.

The cylinder body is provided with a crank arm box, the operating mechanism comprises a transmission structure disposed in the arm box, the transmission structure comprises a crank, and a rotating end of the crank is hinged with a connecting rod, and the crank and the connecting body The hinge point of the rod is located in the middle of the connecting rod, and the grounding switch further comprises a guiding rail connected with one end of the connecting rod and forming a crank slider mechanism together with the crank and the connecting rod, and the other end of the connecting rod is hinged with the moving contact The connecting point of the connecting rod and the guiding rail, the hinge point of the connecting rod and the moving contact, and the rotating center of the crank are all located on the same circle centered on the hinge point of the crank and the connecting rod, and the extending direction of the guiding rail is moving The moving path of the contacts is perpendicular.

The arm box is provided with a movable contact seat for guiding the movable contact, and the movable contact seat is provided with a shield cover at one end facing the static contact.

A protrusion protruding in a radial direction is provided on an end of the movable contact away from the static contact, and the protrusion is configured to perform a stop fit with the movable contact holder to prevent the movable contact from being over-closed.

The movable contact is inserted into the inner hole of the movable contact seat, and the movable contact seat guides the movable contact through a guide ring provided in the inner hole.

The arm box is provided with an outlet end that is electrically connected to the movable contact holder, and the outlet end is located on the opposite or adjacent side wall surface of the arm box.

The inner wall surface of the arm box is provided with a cushion for limiting and buffering the movement of the movable contact when the movable contact is opened.

The GIL transmission system further includes a control system that controls the grounding switch to be disconnected during normal operation of the transmission line, controls the grounding switch to conduct after the transmission line is disconnected, and then grounds the transmission conductor.

In order to achieve the above object, a technical solution of a power transmission line in an embodiment of the present invention is: a power transmission line including a sleeve and a power transmission conductor disposed in the sleeve, wherein the power transmission line is provided for disconnecting in the power transmission line A grounding switch that grounds the power conductor and then discharges the induced current and the induced voltage on the power conductor.

A movable contact seat for guiding the movable contact is arranged on the arm box, and the movable contact seat is facing the static touch A shield is provided at one end of the head.

A protrusion protruding in a radial direction is disposed on an end of the movable contact away from the static contact, and the protrusion is configured to perform a stop fit with the movable contact holder to prevent the movable contact from being over-closed.

The invention has the beneficial effects that the GIL transmission system in one embodiment of the invention is arranged on the power transmission line for conducting the transmission conductors in the casing to the ground after the transmission line is disconnected, thereby inducing the induced current on the transmission conductor and Grounding switch that senses voltage release. After the fault occurs in the GIL transmission line, the power transmission conductor is electrically connected to the ground through the grounding switch, so that the induced current and the induced voltage on the power transmission conductor are released in time, thereby avoiding the induced current and the induced voltage on the power transmission conductor. The equipment creates a hazard that allows the entire GIL transmission system to operate safely.

Further, during the actual use of the grounding switch, the crank is driven by the driving device to rotate around the center of rotation, and the connecting rod hinged is rotated, and one end of the connecting rod moves under the guiding action of the guiding rail, and the other end of the connecting rod moves. The trajectory of the hinge point of the contact is defined by the trajectory of the end movement, so that the hinge end of the connecting rod and the moving contact moves linearly only in a direction away from and close to the fixed contact, and the trajectory of one end of the connecting rod is traversed. The limitation of the movement track of the hinge point of the connecting rod and the moving contact is defined, and the connecting rod does not cause the moving contact to tilt in the moving contact seat during the reciprocating movement of the moving contact, thereby avoiding the moving contact During the high-speed movement, the movement of the moving contact seat caused by the tilting causes the device to operate smoothly. Damage to the moving contact due to the stuck phenomenon is also avoided.

Further, a cushion pad is arranged on the arm box, which can limit and buffer the moving contact that performs quick opening, prevent the moving contact from being over-punched and damage the device.

DRAWINGS

1 is a structural diagram of an earthing switch in an off state in a GIL power transmission system according to an embodiment of the present invention;

2 is a structural diagram of a grounding switch in a GIL power transmission system in a closed state according to an embodiment of the present invention.

In the figure: 1, the cylinder; 2, the arm box; 3, the center conductor; 4, the static contact; 5, the moving contact; 51, the protruding portion; 6, the crank; 7, the connecting rod; 8, the guiding seat; 9, guide plate; 10, cushion; 11, insulating plate; 111, conductive insert; 12, insulating plate; 13, moving contact seat; 131, shield; 14, copper row; 15, ground plate; Grounding block; 17, basin insulator; A, operating mechanism.

Detailed ways

The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

A GIL power transmission system according to an embodiment of the present invention includes a power transmission line including a bushing and a power transmission conductor disposed in the bushing, and the bushing is provided with an insulating gas. The power transmission line is further provided with a grounding switch for connecting the power transmission conductor to the ground when the power transmission line is disconnected to release the induced current and the induced voltage on the power transmission conductor, and the grounding switch is connected in series on the power transmission line, and the grounding switch The specific structure is as shown in FIG. 1 to FIG. 2, and includes a cylinder 1 which is respectively connected with two sleeves at both ends, and an operating mechanism A disposed on the cylinder 1. The operating mechanism A includes a driving device and a transmission. The structure 1 is connected to the arm frame 2, and the transmission structure is located in the arm box 2. A center conductor 3 for communicating with a power transmission conductor inside the casing is disposed in the cylinder 1, and the center conductor 3 is fixed to the center position of the cylinder 1 through two basin insulators 17 disposed on both sides thereof, and the center conductor 3 is A static contact 4 is disposed between the two basin insulators 17. The enclosed gas chamber formed between the cylinder 1 and the two basin insulators 17 is filled with an insulating gas having good insulating properties. In this embodiment, the insulating gas is SF ₆ , and in other embodiments, other insulating materials may be used. Insulating gas with good performance.

The left side wall surface of the arm box 2 is provided with a first connecting port, and the first connecting port is fixed with a guiding seat 8 by bolts. The inner side of the guiding seat 8 is provided with a guiding plate 9, and the guiding plate 9 is horizontally provided with a guiding In the present embodiment, the guide rail is a horizontal long hole provided on the guide plate 9. An outlet port is disposed on the right side wall, and an insulation disk 11 is disposed in the outlet port. The insulation plate 11 is press-fitted to the right end outlet through an insulating platen 12 disposed on the outer side thereof, and a conductive insert 111 is disposed at a center of the insulation disk 11. The insulating platen is correspondingly provided with a through hole for the conductive insert 111 to pass through, and the outer end of the conductive insert is an outlet end. The upper side of the cylinder 1 is provided with a flange opening, and the arm box 2 is connected to the flange opening by a screw. The lower end of the arm box 2 is provided with a second connecting port communicating with the inner cavity of the flange opening, and the turning The lower end of the arm box 2 is connected with a movable contact seat 13 which is located in the inner cavity of the flange opening and has a gap with the inner wall surface of the flange opening.

The middle portion of the arm box 2 is provided with a rotating shaft extending to the outside of the arm box 2 and connected to the driving device. The rotating shaft is located at one end of the arm box and is connected with a crank 6. The rotating end of the crank 6 is hinged with a connecting rod 7, and the crank 6 is The hinge point of the connecting rod 7 is located in the middle of the connecting rod 7, and the left end of the connecting rod 7 is connected to the guiding rail on the guiding plate 9 through the pin shaft and can move along the guiding track, and the crank 6, the connecting rod 7 and the guiding track constitute the crank slider. mechanism. A movable contact 5 is hinged to the right end of the link 7. The connection point of the connecting rod 7 with the guiding rail, the hinge point of the connecting rod 7 and the movable contact 5, and the three points of the center of rotation of the crank are all located on the same circle centered on the hinge point of the crank and the connecting rod, and the extending direction of the guiding rail It is perpendicular to the moving path of the moving contact.

An inner hole through which the movable contact 5 passes is disposed in the movable contact base 13 , and a lower end contact end of the movable contact 5 extends through the inner hole to the cylinder 1 to cooperate with the static contact 4 , and the movable contact seat 13 is disposed near the lower end of the static contact 4 with a shield cover 131. The upper end surface of the static contact 4 is arranged as a circular arc surface, and the arrangement of the shield cover 131 and the setting of the circular arc surface all play the role of equalizing the electric field, thereby improving the dynamic touch. Insulation between the headstock 13 and the stationary contact 4.

In addition, an end of the movable contact 5 remote from the static contact 4 is provided with a protrusion in a radial direction for The movable contact holder 13 stops the engagement and prevents the protruding portion 51 from being over-closed by the movable contact. The upper inner wall surface of the arm box 2 is provided with a cushion pad 10 for limiting and buffering the upward movement distance of the movable contact 5 when the movable contact 5 is opened. The crank 6 swings up and down within a range of 80° in the left space inside the arm box 2 under the restriction of the above two limit structures. The inner hole of the movable contact seat 13 is provided with a guide ring (not shown) for adjusting the moving direction of the movable contact 5 to ensure the centering of the movable contact 5 and the fixed contact 4.

An insulating structure is disposed at a hinge position of the movable contact 5 and the connecting rod 7 for achieving insulation between the movable contact 5 and the transmission structure, and the insulating structure includes a matching surface disposed on the movable contact 5 and the hinge shaft The rubber sleeve between the rubber sleeve and the insulating gasket disposed between the movable contact 5 and the mating surface of the connecting rod 7. An insulating structure is also disposed between the movable contact base 13 and the arm housing 2 for achieving insulation between the movable contact base 13 and the arm housing 2, and the insulating structure includes a movable contact base 13 and An insulating sleeve between the connecting structures and an insulating spacer disposed between the movable contact base 13 and the mating surface of the arm housing 2.

The movable contact holder 13 is electrically connected to the inner end of the conductive insert 111 through the copper row 14 , and the outer end of the conductive insert 111 is electrically connected to the ground block 16 disposed on the barrel 1 through the ground plate 15 , and the barrel 1 Conductive connection with the ground to realize the function of the grounding switch; when the movable contact 5 is to be used as the test electrode, the electrical connection between the grounding plate 15 and the grounding block 16 can be disconnected, and the test can be performed.

The GIL power transmission system according to an embodiment of the present invention further includes a control system that controls the grounding switch to be turned off when the power transmission line is in normal operation, controls the grounding switch to be turned on after the power transmission line is disconnected, and then grounds the power transmission conductor.

During actual use of the GIL power transmission system according to an embodiment of the present invention, and during actual use of the grounding switch according to an embodiment of the present invention, the grounding switch is disposed on the power line for disconnection on the power transmission line Afterwards, the power conductor in the bushing is electrically connected to the ground to release the induced current and the induced voltage on the power conductor. After the GIL transmission line fails and is disconnected, the power transmission conductor is electrically connected to the ground through the grounding switch, so that the induced current and the induced voltage on the power transmission conductor are released in time, thereby avoiding induced current and induction on the power transmission conductor. Voltage Harm to the equipment, so that the entire GIL transmission system can operate safely.

In addition, during use of the grounding switch, the crank 6 is driven to rotate by the rotating shaft to drive the connecting rod 7 hinged thereto to rotate, and the left end of the connecting rod 7 moves horizontally under the guiding action of the guiding rail, and the movement track at the left end of the connecting rod 7 Under the constraint, the trajectory of the hinge point of the right end of the link 7 and the movable contact 5 is constrained to the vertical direction. By defining the movement track of the left end of the connecting rod 7 to define the movement track of the hinge point of the right end of the connecting rod 7 and the moving contact 5, the connecting rod 7 does not cause the moving contact 5 during the reciprocating movement of the moving contact 5 The tilting in the movable contact base 13 avoids the phenomenon that the moving contact 5 is stuck with the moving contact seat 13 due to the tilting during the high-speed movement, so that the device can operate smoothly. Damage to the movable contact 5 due to the stuck phenomenon is also avoided.

The movable contact 5 is in conductive communication with the movable contact seat 13. The movable contact base 13 communicates with the ground through the copper bar 14, the conductive insert, the ground plate 15, the ground block 16, and the cylinder 1.

As another embodiment of the present invention, the grounding plate 15 may also be electrically connected to the cylinder without being electrically connected to the cylinder through the grounding block 16.

As another embodiment of the present invention, the guide rail may also be guided to the mounting slider, and the connecting rod is hinged with the slider and moved on the guiding rail by the slider.

As another embodiment of the present invention, the outlet opening of the outlet end of the movable contact seat is not disposed on the right side wall surface opposite to the guide rail, but is disposed on the front side wall surface or the rear side wall surface adjacent to the guide rail. .

For the specific embodiment of the grounding switch and the power transmission line of the present invention, the specific structure is the same as that of the grounding switch and the power transmission line in the embodiments of the above-mentioned GIL power transmission system, and details are not described herein again.

Claims

A GIL power transmission system includes a power transmission line including a casing and a power transmission conductor disposed in the casing, wherein the power transmission line is provided with a grounding device for grounding the power transmission conductor after the power transmission line is disconnected Grounding switch for induced current and induced voltage on the power conductor.
The GIL power transmission system according to claim 1, wherein the grounding switch is connected in series on the power transmission line, and comprises a cylinder connected to the sleeve, wherein the cylinder body is provided with a static contact electrically connected to the power transmission conductor, and the grounding switch is further The utility model comprises a movable contact electrically connected to the ground, and the contact end of the movable contact protrudes into the cylinder and is driven by the operating mechanism to achieve contact and separation with the static contact.
The GIL power transmission system according to claim 2, wherein said cylinder is provided with a crank box, said operating mechanism comprising a transmission structure disposed in the arm housing, said transmission structure including a crank, said crank The rotating end is hinged with a connecting rod, and the hinge point of the crank and the connecting rod is located at a middle portion of the connecting rod, and the grounding switch further comprises a guiding rail connected with one end of the connecting rod and forming a crank slider mechanism together with the crank and the connecting rod The other end of the connecting rod is hinged with the moving contact, the connecting point of the connecting rod and the guiding rail, the hinge point of the connecting rod and the moving contact, and the rotating center of the crank are located at the center of the hinge point of the crank and the connecting rod. On the same circle, the guiding track extends in a direction perpendicular to the moving path of the moving contact.
The GIL power transmission system according to claim 3, wherein the arm housing is provided with a movable contact seat for guiding the movable contact, and the movable contact holder is provided with a shield at an end facing the stationary contact.
The GIL power transmission system according to claim 4, wherein a projection projecting in a radial direction is provided on an end of the movable contact remote from the stationary contact, the projection being used for a movable contact holder The blocking fit is performed to prevent the moving contact from being over-closed.
The GIL power transmission system according to claim 4, wherein the movable contact is inserted into the inner hole of the movable contact base, and the movable contact seat guides the movable contact through a guide ring provided in the inner hole.
The GIL power transmission system according to claim 4, wherein said arm box is provided with an outlet end that is electrically connected to the movable contact holder, and said outlet end is located opposite or adjacent to said guide rail at the arm housing On the side wall.
The GIL power transmission system according to claim 3, wherein the inner wall surface of the arm housing is provided with a cushion for limiting and buffering movement of the movable contact when the movable contact is opened.
The GIL power transmission system according to any one of claims 1-8, wherein the GIL power transmission system further comprises: controlling the grounding switch to be turned off when the power transmission line is in normal operation, and controlling the grounding switch to be turned on after the power transmission line is disconnected. A control system that grounds the transmission conductor.
A power transmission line includes a casing and a power transmission conductor disposed in the casing, wherein the power transmission line is provided with an inductive current and an induced voltage for grounding the power transmission conductor after the power transmission line is disconnected Release the grounding switch.
The power transmission line according to claim 10, wherein the grounding switch is connected in series on the power transmission line, and comprises a cylinder connected to the sleeve, wherein the cylinder body is provided with a static contact electrically connected to the power transmission conductor, and the grounding switch further comprises The movable contact electrically connected to the ground, the contact end of the movable contact protrudes into the cylinder and is driven by the operating mechanism to achieve contact and separation with the static contact.
The power transmission line according to claim 11, wherein said cylinder is provided with a crank box, said operating mechanism comprising a transmission structure disposed in the arm housing, said transmission structure including a crank, said crank The rotating end is hinged with a connecting rod, the hinge point of the crank and the connecting rod is located at a middle portion of the connecting rod, and the grounding switch further comprises a guiding track connected with one end of the connecting rod and forming a crank slider mechanism together with the crank and the connecting rod. The other end of the connecting rod is hinged with the moving contact, the connecting point of the connecting rod and the guiding rail, the hinge point of the connecting rod and the moving contact, and the rotating center of the crank are located at the same center of the hinge point of the crank and the connecting rod. On the circle, the guiding track extends in a direction perpendicular to the moving path of the movable contact.
The power transmission line according to claim 12, wherein the arm housing is provided with a movable contact seat for guiding the movable contact, and the movable contact holder is provided with a shielding at one end facing the stationary contact cover.
The power transmission line according to claim 13, wherein one end of the movable contact remote from the fixed contact is provided with a protrusion protruding in a radial direction, and the protrusion is for blocking the movable contact holder. The mating is combined to prevent the moving contact from being over-closed.
The power transmission line according to claim 13, wherein the movable contact is inserted into the inner hole of the movable contact seat, and the movable contact seat guides the movable contact through a guide ring provided in the inner hole.
The power transmission line according to claim 13, wherein said arm box is provided with an outlet end that is electrically connected to the movable contact holder, and said outlet end is located on the opposite or adjacent side of said arm frame from said guide rail On the wall.
The power transmission line according to claim 12, wherein the inner wall surface of the arm housing is provided with a cushion for limiting and buffering movement of the movable contact when the movable contact is opened.
A grounding switch for setting on a power transmission line, the power transmission line comprising a sleeve and a power transmission conductor disposed in the sleeve, wherein the grounding switch is used for grounding the power transmission conductor after the power transmission line is disconnected The induced current and induced voltage on the power conductor are released.
The earthing switch according to claim 18, wherein the grounding switch is connected in series on the power transmission line, and comprises a cylinder connected to the sleeve, wherein the cylinder body is provided with a static contact electrically connected to the power transmission conductor, and the grounding switch further comprises The movable contact electrically connected to the ground, the contact end of the movable contact protrudes into the cylinder and is driven by the operating mechanism to achieve contact and separation with the static contact.
The earthing switch according to claim 19, wherein said cylinder is provided with a crank box, said operating mechanism comprising a transmission structure disposed in the arm housing, said transmission structure including a crank, said crank The rotating end is hinged with a connecting rod, the hinge point of the crank and the connecting rod is located at a middle portion of the connecting rod, and the grounding switch further comprises a guiding track connected with one end of the connecting rod and forming a crank slider mechanism together with the crank and the connecting rod. The other end of the connecting rod is hinged with the moving contact, the connecting point of the connecting rod and the guiding rail, the hinge point of the connecting rod and the moving contact, and the rotating center of the crank are located at the same center of the hinge point of the crank and the connecting rod. Round, said The direction in which the guide rail extends is perpendicular to the moving path of the movable contact.