CN217768203U - Three-station isolation grounding switch - Google Patents

Abstract

The utility model discloses a three-position isolation grounding switch, which comprises a casing, wherein a static side assembly, a moving side assembly, a grounding contact, an insulating torsion bar and a conductor are arranged in the casing, and the static side assembly passes through the conductor. Connected to the basin insulator, the static side has a variety of outlet methods. The movable side assembly is connected with the operating mechanism through an insulating torsion bar, and a ground contact is provided on the side of the casing close to the movable side assembly. The utility model can realize a variety of outgoing ways, meet the needs of flexible layout on site, and can also reduce the investment of the three-way transfer module and shorten the length of the cable-pulled busbar. Transportation, saving manpower and material resources for installation.

Description

A three-position isolating grounding switch

technical field

The utility model belongs to the technical field of grounding switches, in particular to a three-position isolating grounding switch.

Background technique

At present, in the ultra-high voltage power system, especially in the engineering layout of one and a half times cable-stayed busbars of ultra-high voltage gas-insulated metal-enclosed combined switchgear (GIS), the two-position isolating switch and the three-position isolating grounding switch are shown in Figure 1 and As shown in Figure 2, since there are only side outlets, when other equipment needs to be installed on it, it needs to be installed through a three-way adapter module. Therefore, there are many three-way/four-way adapter modules and the overall transportation is inconvenient.

Prior art CN203966948U discloses a three-position isolating grounding switch in a gas-insulated metal-enclosed switchgear. bit isolation grounding switch.

It includes: a conductor, the conductor is installed on the pot insulator, an insulating pull rod is installed between the moving contact and the transmission mechanism, one end of the insulation pull rod is connected to the transmission mechanism, and the other end is connected to the gear, and the transmission mechanism is installed on the flange. The three-station electric operating mechanism is connected to one of the transmission mechanisms; the gear meshes with the rack fixed in the moving contact; the transmission link adopts three-phase linkage, sharing a three-station electric operating mechanism , effectively guarantee the three-phase synchronicity of opening and closing operations, and ensure more reliable performance; the switch uses direct-acting plug-in copper moving contacts, the middle contact has a coil spring structure with multiple points of contact, and the middle contact seat is equipped with a guide The ring ensures that the moving contact is in the center position, and produces a uniform positive pressure on the ring spring within the circumference range, improving the flow capacity in many ways. The special arc contact structure of the isolating switch station, when opening and closing the busbar to convert the current, the moving contact and the isolating static contact are separated first, and the moving contact and the arc contact are separated later, and the arc is between the moving contact and the arc contact. Intermittent arcing, to avoid arc ablation shield; switch fracture shield is multi-curvature radius circular arc connection of spinning shield structure, electric field strength is uniform and reliable, effectively shorten the opening distance, making the switch space smaller, more compact structure, switch The overall weight is lighter.

When working, the three-station electric operating mechanism drives the insulating pull rod and the gear to rotate synchronously through the transmission mechanism, and the gear meshes with the rack to convert the rotary motion into a linear operation. The head moves in a straight line to realize the opening and closing action: that is, the moving contact is in contact with the isolated static contact to perform the closing function of the isolating switch, which is the operating state of the switch in the power system; the moving contact is in the middle position and is in contact with the isolated static contact. The contact and the grounding static contact are not in contact. This station is an intermediate state between operation and maintenance of the switch in the power system; the moving contact is in contact with the grounding static contact. This station performs the function of grounding closing and closing. is the maintenance state of the switch in the power system.

In the prior art, the three-station isolating grounding switch will adopt the layout shown in Figure 2 in actual engineering use, which mainly has the following disadvantages: there is only one way for the flow and outlet of the isolated static side. When the isolating switch is closed, the dynamic and static An "L"-shaped flow main circuit is formed on the side, and the circuit structure is single, which cannot meet the needs of flexible layout on site.

Contents of the invention

The utility model provides a three-station isolating grounding switch, which reduces the investment of the three-way transfer module and shortens the length of the cable-stayed busbar, and at the same time satisfies the demand for flexible layout on site.

In order to achieve the above-mentioned purpose, a three-position isolating grounding switch of the present invention includes a housing, which is provided with a static side assembly, a moving side assembly, a grounding contact, an insulating torsion bar and a conductor, and the static side assembly passes through the conductor and the second A pot insulator is connected, the first pot insulator is located on the upper side of the housing; the moving side assembly is connected to the operating mechanism through an insulating torsion bar, and a grounding contact is provided on the side of the housing near the moving side assembly.

Further, the side of the static-side assembly away from the dynamic-side assembly is connected to the second basin-type insulator.

Further, the conductor is plugged into the first pot insulator.

Further, the side of the static-side assembly away from the dynamic-side assembly is sealed with a shielding head, and a cover plate is arranged on the outside of the shielding head, and the cover plate is fixedly connected to the housing.

Further, the operating mechanism is arranged above the casing.

Further, particle traps are arranged under the static side assembly and the dynamic side assembly.

Further, the particulate trap is detachably mounted on the bottom surface of the casing.

Further, the ground contact is connected to the ground cover, and the ground cover is installed outside the casing.

Compared with the prior art, the utility model has at least the following beneficial technical effects:

The static side of the three-position isolating grounding switch of the utility model can realize a variety of outlet methods, which can meet the needs of flexible layout on the site, and can also reduce the investment of the three-way transfer module and shorten the length of the cable-stayed busbar. On the one hand, it can reduce product manufacturing. On the other hand, it is also convenient for whole-space transportation, saving manpower and material resources for installation.

Furthermore, the main circuit on the moving side adopts a right-angle flow structure and is directly connected to the current transformer, which can save the connection of a three-way adapter module.

Furthermore, the static side adopts three outlet methods: top outlet, side outlet or double outlet, which can separately and simultaneously realize bushing inlet and outlet and cable-stayed busbar connection functions within one and a half intervals, avoiding the addition of redundant three-way connection modules.

Further, the operating mechanism is placed on the top, which saves the space for maintenance and can avoid occupying the space of the main body maintenance platform.

Further, there is a particulate trap below the fracture of the three-position isolating grounding switch, which can collect and suppress foreign matter that may be generated between the fractures, and avoid the risk of foreign matter discharge caused by the horizontally arranged pot insulators receiving foreign matter.

Description of drawings

Figure 1 is a schematic diagram of the layout of the existing two-position isolating switch;

Figure 2 is a schematic diagram of the layout of the existing three-position isolating grounding switch;

Fig. 3 is a schematic structural diagram of the three-position isolating grounding switch of Embodiment 1;

Fig. 4 is a schematic structural diagram of a three-position isolating grounding switch in Embodiment 2;

Figure 5 is a schematic diagram of the arrangement of the first and third compartments under the cable-stayed bus arrangement;

Fig. 6 is a schematic diagram of the layout of the second compartment under the cable-stayed bus arrangement;

Figure 7 is a schematic diagram of the horizontal layout of the original isolating switch;

Fig. 8 is a schematic diagram of the horizontal layout of the three-position isolating grounding switch of the present invention.

In the drawings: 1. Static side assembly, 2. Housing, 3. Particle catcher, 4. Dynamic side assembly, 5. Grounding contact, 6. Grounding cover, 7. Insulating torsion bar, 8. Operating mechanism , 9, conductor, 101, first pot insulator, 102, first pot insulator, 103, third pot insulator, 11, cover plate, 12, shielding head, 13, circuit breaker, 14, current transformer, 15. Three-position isolation grounding switch, 16. Expansion joint, 17. Main busbar, 18. Four-way transfer module, 19. Cable-stayed busbar, 20. Three-way transfer module, 21. Short branch busbar, 22. Access and exit Line branch bus.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" etc. are based on the attached The orientation or positional relationship shown in the figure is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as Limitations on the Invention.

The utility model discloses a three-station isolating grounding switch, especially relates to the field of ultra-high voltage voltage levels, and is suitable for the arrangement of ultra-high voltage GIS double-and-a-half cable-stayed busbars. At the same time, it realizes the connection function of casing inlet and outlet and cable-stayed busbar.

First explain the relevant terms:

Three-position isolation and grounding switch: a switchgear integrating isolation and grounding, which can realize three working conditions of closing, opening and grounding through mechanism operation.

Operating mechanism: a device that operates a switchgear to make it close and open.

Moving side: The side connected to the operating mechanism is called the moving side.

Static side: Corresponding to the dynamic side, the side that is not connected to the operating mechanism is called the static side.

Circuit breaker: It can close, carry and break the current under normal circuit conditions; carry the specified overcurrent within the specified time, and can close and break the current under abnormal circuit conditions (such as various short-circuit conditions) mechanical switching device.

Current transformer: Under normal use conditions, its secondary current is substantially proportional to the primary current, and its phase difference is close to zero when the connection method is correct.

Tee: A switchgear housing with three inlet and outlet ports.

Bushing: A structural member that can carry and insulate one or more poles of conductors through a barrier (such as a wall or enclosure).

Busbar: Factory assembled, consisting of conductors supported or separated by insulating material in ducts, wireways, or similar enclosures.

Break: The space between the static and dynamic sides of a switchgear.

Particle trap: A device that collects or suppresses discharge particles and foreign matter.

One-and-a-half-fold wiring: An electrical main wiring method, three switchgears are connected in series in two sets of main busbars, and an incoming and outgoing line is connected between the two switchgears.

Cable-stayed busbar layout: The branch busbar connecting two switchgear adopts cable-stayed layout.

"One" shape layout: the branch bus connecting two switchgear adopts "one" shape layout.

Expansion joint: an adjustment device used on the busbar to fine-tune the angle or length of the busbar.

Referring to Figures 3 and 4, a three-position isolating grounding switch includes a static side assembly 1, a housing 2, a particle trap 3, a moving side assembly 4, a grounding contact 5, a grounding cover 6, and an insulating torsion bar 7 , operating mechanism 8, conductor 9, first pot insulator 101, second pot insulator 102, third pot insulator 103, cover plate 11 and shielding head 12. Figure 3 and Figure 4 static side assembly 1 is a common structure, the difference is that the side of static side assembly 1 in Figure 3 is blocked by shielding head 12, the side of shell 2 is equipped with cover plate 11, and the top of static side assembly 1 passes conductor 9 and The first basin-type insulator 101 is fixedly connected by bolts to realize the way of upper and lower wires; Fig. 4 Static side assembly 1 side and the second basin-type insulator 102 are fixedly connected by bolts, and the upper part is connected to the first basin-type insulator 101 by plugging the conductor 9 Connected to achieve double outlet mode, that is, it has the functions of upper outlet and side outlet at the same time, which is convenient for assembly; the upper end of the moving side assembly 4 of the isolation earthing switch is connected with the operating mechanism 8 through the insulating torsion bar 7, and three kinds of opening, closing and grounding are realized. For the operation of the station, the lower end is connected to the third pot insulator 103; the grounding contact 5 is connected to the grounding cover 6, which can realize the grounding of the inner conductor and the shell 2. The main conductive circuit on the moving side of the utility model adopts a right-angle flow structure, that is, no matter whether the moving side assembly 4 is connected to the static side assembly 1 or connected to the ground contact 5, the formed path is L-shaped.

The operating mechanism 8 adopts the upper mode.

There are two outlet ways for the static side assembly and the shell: When the static side assembly and the shell adopt the side outlet, after the dynamic and static side is closed, the lower part of the incoming line, the dynamic side assembly 4 and the static side assembly 1 form an "L" shaped conductive circuit , When the static side assembly and the shell use the upper outlet, after the dynamic and static side is closed, the lower incoming line, the dynamic side assembly 4 and the static side assembly 1 form a "Z"-shaped conductive circuit.

Particle traps 3 are arranged inside the casing below the static side and dynamic side fractures.

Example 1

This embodiment adopts the structure shown in FIG. 3 . The static side assembly 1 is fixedly connected to the first basin insulator 101 through the conductor 9 , and passes through the upper outlet of the casing 2 to form a separate upper inflow and outflow channel. This embodiment can be used in the first and third compartments when one and a half cable-stayed busbars are arranged.

The layout of the first and third compartments is shown in Figure 5, mainly including a circuit breaker 13, a current transformer 14, a three-position isolating grounding switch 15, an expansion joint 16, a main bus bar 17, and a four-way transfer module 18 , cable-stayed busbar 19, three-way adapter module 20 and short branch busbar 21. The circuit breaker 13 is a single-break circuit breaker, and the three-position isolating grounding switch 15 is arranged horizontally. The moving side assembly 4 of the three-positioning isolating grounding switch 15 is connected to the current transformer 14, and the static side assembly 1 is connected to the short branch busbar 21 or The telescopic joints 16 are connected, and when the moving-side assembly 4 and the static-side assembly 1 are switched on, a "Z"-shaped flow circuit is formed inside the isolating grounding switch 15, which can meet the requirements of the incoming and outgoing lines of the main bus 17 and the cable-stayed bus 19 respectively.

Example 2

Using the structure shown in Figure 4, the static side assembly 1 is fixedly connected to the second pot insulator 102 on the side, and connected to the first pot insulator 101 through the conductor 9 on the top, and a pot is installed on the side and top of the shell 2 The type insulator is used as the inlet and outlet, through the side outlet and the upper outlet of the shell 2, and simultaneously forms a side and an upper dual channel of incoming and outgoing current. This implementation manner can be used in the second interval when one and a half cable-stayed busbars are arranged.

The layout in the second compartment is shown in Figure 6, mainly including circuit breaker 13, current transformer 14, three-position isolating grounding switch 15, cable-stayed busbar 19, three-way transfer module 20, short branch busbar 21 and access Line branch bus 22. The circuit breaker 13 is a single-break circuit breaker, and the three-position isolating grounding switch 15 adopts a horizontal layout. The moving side assembly 4 of the three-positioning isolating grounding switch 15 is connected to the current transformer 14, and the top of the static side assembly 1 is connected to the short branch busbar 21 is connected, and the side is connected with the branch bus bar 22 of the incoming and outgoing lines. When the moving side assembly 4 and the static side assembly 1 are closed, a "Z" shape and an "L" shape flow circuit can be formed inside the isolating grounding switch 15, which can be simultaneously Meet the cable-stayed bus 19 and the incoming and outgoing branch bus 22 requirements.

The three-position isolating grounding switch 15 adopts a horizontal arrangement in the above two embodiments, and a fracture is formed between the static side assembly 1 and the dynamic side assembly 4, and foreign matter may fall during the opening and closing process. At this time, the foreign matter It can be collected and suppressed by the particle trap 3 arranged at the bottom of the casing, so as to avoid the risk point of foreign matter falling on the third pot insulator 103 and forming a discharge.

Referring to Figure 7 and Figure 8, in the horizontal arrangement, the original isolating switch only has a side outlet. When other equipment needs to be installed on it, it needs to be installed through a three-way adapter module, so the three-way adapter There are more than 20 modules; and the existence of the three-way transfer module increases the distance between the two switches, making the cable-stayed bus longer; and the three-position isolation grounding switch provided by the utility model can reduce the cost of the three-way transfer module. Invest in and shorten the length of cable-stayed busbars, reduce product manufacturing costs, facilitate interval integration layout and installation, have the advantages of high degree of standardization of unit modules, compact structure domain, high safety and reliability, and also facilitate entire interval transportation. The above content is only to illustrate the technical idea of the utility model, and cannot limit the protection scope of the utility model. Any changes made on the basis of the technical solution according to the technical idea proposed by the utility model all fall into the scope of the utility model. within the scope of protection of the claims.

Claims (8)

1. A three-station isolating grounding switch is characterized in that it comprises a housing (2), and the housing (2) is provided with a static side assembly (1), a dynamic side assembly (4), a grounding contact ( 5), insulating the torsion bar (7) and the conductor (9), the static side assembly (1) is connected to the first pot insulator (101) through the conductor (9), and the first pot insulator (101) is located at The upper side of the housing (2); the moving side assembly (4) is connected to the operating mechanism (8) through an insulating torsion bar (7), and the side of the housing (2) close to the moving side assembly (4) is provided with Ground contact (5). 2. A three-position isolating grounding switch according to claim 1, characterized in that, the side of the static side assembly (1) away from the dynamic side assembly (4) is connected to the second pot insulator (102) . 3. The three-position isolating grounding switch according to claim 2, characterized in that the conductor (9) is plugged into the first pot insulator (101). 4. A three-position isolating grounding switch according to claim 1, characterized in that the side of the static side assembly (1) away from the dynamic side assembly (4) is blocked with a shielding head (12), so A cover plate (11) is arranged on the outer side of the shielding head (12), and the cover plate (11) is fixedly connected to the casing (2). 5. A three-position isolating grounding switch according to claim 1, characterized in that the operating mechanism (8) is arranged above the casing (2). 6 . The three-position isolating grounding switch according to claim 1 , characterized in that a particulate trap ( 3 ) is arranged under the static side assembly ( 1 ) and the dynamic side assembly ( 4 ). 7. The three-position isolating grounding switch according to claim 6, characterized in that the particulate trap (3) is detachably installed on the bottom surface of the casing (2). 8. A three-position isolating grounding switch according to claim 1, characterized in that the grounding contact (5) is connected to the grounding cover (6), and the grounding cover (6) is installed on the housing Body (2) outside.

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