KR102497759B1 - Gas insulation switchgear - Google Patents

Abstract

The present invention relates to a gas insulation switchgear for opening and closing power equipment. The present invention includes a circuit breaker and a ground-disconnector, wherein the circuit breaker includes: a housing including a space part; a mover disposed in the space part and including a vacuum part provided therein, a movable contact part provided at one end, and a rod which is connected to the movable contact part and at least a portion of which is embedded in the vacuum part; a stator disposed to be spaced apart from the mover and including a fixed contact part in contact with the movable contact part; and a driving means provided in the vacuum part and including a moving member that moves the rod toward the stator and a return member that returns the rod. The present invention has an effect of improving the efficiency of a driving mechanism through the moving member with a unique structure.

Description

Gas insulated switchgear {GAS INSULATION SWITCHGEAR}

The present invention relates to a gas insulated switchgear for opening and closing power equipment.

Gas Insulated Switchgear is installed between the circuit between the power side and the load side of the electrical system to safely switch the current when the circuit is artificially opened or closed in a normal current state or when an abnormal current such as a ground fault or short circuit occurs on the circuit. It is a device that protects the power system and load equipment by shutting off.

These gas insulated switchgear (GIS) generally include a bushing unit that receives power from a high-voltage power source, a gas circuit breaker (CB), a disconnector switch, an earthing switch, a moving part, a control unit, etc. It consists of In the above, the disconnector and the grounding switch may be configured integrally, so it is also called a grounding-disconnector.

As a representative configuration, a circuit breaker is a configuration that opens and closes load current and cuts off fault current. It opens and closes load current, line charging current, transformer excitation current, etc. at normal times, and signals generated by the operation of a protective relay in case of a fault. , the trip coil is excited and cuts off the circuit breaker to protect the device by blocking short-circuit current, ground fault current, and fault current. In addition, the arc is extinguished using insulating gas, and the insulating gas is a mixture of NOVEC 4710, which has an ozone depletion potential (ODP) of 0, and carbon dioxide (CO2). can make it

As another representative configuration, the ground-disconnector is a configuration that opens and closes the line when no load is applied, and through this, it is possible to repair, inspect, or disconnect the device from the line and change the circuit. In the case of a ground-disconnector, the line is opened and closed after cutting off the current of the circuit breaker to cut off the current in a no-load state, so separation from the power supply can be ensured.

In such a gas insulated switchgear, the circuit breaker may be configured in a pneumatic method, a hydraulic method, an electric method, or the like, and in the case of the electric method, the circuit breaker is driven by using the rotation of the motor.

In the case of adopting a motor method, a means for buffering the rotation of the motor while the crank is driven by the rotation of the motor and returning the crank to its original position when the external force disappears is generally used as a return means. do.

As a conventional technique for constructing a return means by utilizing a spring, there is No. 20-0492868 for registration room (December 17, 2020, hereinafter referred to as prior art). In the prior art, including the prior art, the spring is exposed to the outside, There are concerns such as breakage and corrosion of the spring, and there are problems such as inefficiency of the driving mechanism and concern about spring separation.

The present invention has been made to solve the above problems, in a gas insulated switchgear adopting a motorized circuit breaker, the spring is embedded in a vacuum housing to completely seal it from the outside, thereby preventing damage and corrosion of the spring, and further driving An object of the present invention is to provide a gas insulated switchgear in which the efficiency of the mechanism is improved and the separation of the spring can be effectively prevented.

The present invention, for the purpose of solving the above problems, includes a circuit breaker and a ground-disconnector, wherein the circuit breaker is disposed in a housing including a space, and a vacuum part disposed in the space and provided therein, provided at one end A movable element including a movable contact part and a rod connected to the movable contact part and at least a part of which is embedded in the vacuum part, and a stator including a fixed contact part disposed apart from the movable contact part and in contact with the movable contact part and a driving means provided in the vacuum unit and including a moving member for moving the rod toward the stator and a return member for returning the rod.

In addition, the return member includes a spring provided to surround the rod, a pressure plate coupled to the rod and pressurizing the spring by movement of the rod, and a through hole through which the rod passes, and supports an end portion of the spring. It is characterized in that it may include a support plate to do.

In addition, at least one of the pressure plate and the support plate is characterized in that it may include an extended extension portion.

Furthermore, the movable member includes a rotating shaft provided perpendicularly to the circuit breaker and rotated by a motor, one end connected to the rotating shaft, and a first linker rotated by the rotating shaft, one end connected to the other end of the first linker, It may include a second linker that linearly moves by rotation of the first linker, and a cam whose first end is connected to the other end of the second linker and whose second end is connected to the rod.

The present invention having the above configuration and characteristics, by embedding a driving means including a spring inside a mover including a vacuum part, by embedding the spring in a vacuum housing to completely seal it from the outside, preventing breakage and corrosion of the spring. do.

In addition, by introducing a pressure plate and a support plate at both ends of the spring, the stable driving and separation prevention of the spring is realized, thereby improving the efficiency of the driving mechanism and effectively preventing the separation of the spring.

In addition, it has the effect of improving the efficiency of the driving mechanism through the moving member having a unique structure.

1 is a view showing the appearance of a gas insulated switchgear according to the present invention.
Figure 2 is a front view showing the internal structure of the circuit breaker according to the present invention.
3 is a side view showing the internal structure of this circuit breaker.
Figure 4 is a separate view showing the contact structure of this circuit breaker.
5 and 6 are enlarged views of the return structure of the circuit breaker.

Since the present invention can have various changes and various forms, the embodiments (or implementations) will be described in detail in the text. However, this is not intended to limit the present invention to a specific form disclosed, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and scope of the present invention.

Terms used in this specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as ~comprising~ or ~consisting of are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

~First~, ~Second~, etc. described in this specification will only be referred to to distinguish different components from each other, regardless of the manufacturing order, and the names in the detailed description and claims of the invention may not match.

Prior to the detailed description of the present invention, if the approximate direction is specified with reference to FIG. 4 for convenience of description, the lower part means the direction in which the support plate 423 is provided with respect to the pressing plate 422, and the upper part means a direction in which the pressure plate 422 is provided with respect to the support plate 423.

Hereinafter, a gas insulated switchgear according to the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to a gas insulated switchgear (this device), and as shown in FIG. 1, it may include a circuit breaker for opening and closing a load current and blocking a fault current, and a ground-disconnector for opening and closing a line at no load.

This device, including a circuit breaker, opens and closes the load current, charging current of the line, and excitation current of the transformer at normal times. It serves to protect the device by blocking short-circuit current, ground fault current, and fault current. In addition, the arc is extinguished using insulating gas, and the insulating gas is a mixture of NOVEC 4710, which has an ozone depletion potential (ODP) of 0, and carbon dioxide (CO2). can make it

In addition, the device further includes a ground-disconnector, so that equipment can be repaired, inspected, or disconnected from a line and the circuit can be changed. In the case of a ground-disconnector, the line is opened and closed after cutting off the current of the circuit breaker to cut off the current in a no-load state, so separation from the power supply can be ensured.

Due to the above configuration, the current of the circuit breaker is first closed, and then the line of the ground-disconnector is closed, thereby changing the disconnector to a no-load state and then closing the circuit of the disconnector, so that the operator can work while preventing safety accidents such as electric shock. can carry on

As shown in FIGS. 2 and 3, the circuit breaker is provided at one end of a housing 1 including a space portion 11, and a vacuum portion 21 disposed in the space portion 11 and provided therein. A mover (2) including a movable contact part (22) and a rod (23) connected to the movable contact part (22) and at least a part of which is embedded in the vacuum part (21), and the mover (2) A stator 3 including a fixed contact portion 32 disposed apart from and in contact with the movable contact portion 22, and provided in the vacuum portion 21, and the rod 23 is provided in the stator ( 3) It may include a driving means 4 including a moving member 41 for moving to the side and a return member 42 for returning the rod 23.

The circuit breaker includes a space portion 11 and maintains a constant pressure inside the space portion 11 to provide an environment in which the mover 2 and the fixed contact can come into contact with a constant pressure, and when an arc occurs. The arc is removed through the insulating gas inside the space part 11 .

In one embodiment, the circuit breaker and the space portion 11 may be made of aluminum (Al) material. Aluminum (Al) realizes light weight of the circuit breaker due to its low weight and strong strength compared to its weight. , Since aluminum has a paramagnetic property that does not stick well to a magnet, it is possible to suppress an induced current from being generated into the space portion 11.

In addition, the circuit breaker may further include a vacuum part 21 provided inside the space part 11 .

Contact between the mover 2 and the stator 3 is made in the vacuum part 21, and since the vacuum part 21 is placed in the space 11 equipped with insulating gas, if an arc occurs after the contact, it is movable. The contact between the ruler 2 and the stator 3 is released, and the insulating gas is inserted into the vacuum part 21 at high pressure, and the generated arc is removed by the inserted insulating gas.

In addition, the present circuit breaker includes a movable contact part 22 provided at one end and a movable element 2 including a rod 23 connected to the movable contact part 22 and at least partially embedded in the vacuum part 21, and The stator 3 may further include a fixed contact portion 32 disposed to be spaced apart from the mover 2 and in contact with the movable contact portion 22 .

Due to the above configuration, the movable contact part 22 of the mover 2 and the fixed contact part 32 of the stator 3 are brought into contact so that current flows, and a large current flows due to a fault occurring in the line or a protective relay. When a signal generated by an operation is received, the contact between the movable contact part 22 of the mover 2 and the fixed contact part 32 of the stator 3 is released to cut off the current to prevent accidents caused by fire and electric shock. prevent.

2 to 5, the circuit breaker includes a moving member 41 that moves the rod 23 toward the stator 3 and a return member 42 that returns the rod 23. It may further comprise means (4).

Since the driving means 4 includes a moving member 41 and the rod 23 ascends and descends toward the stator 3 and contacts the stator 3, current can be opened and closed.

In addition, the driving means 4 further includes the return member 42, so that when a large current flows due to a failure somewhere in the line or a signal generated by the operation of a protective relay is received, the motor operates according to the detection of the motor. By rotating in the opposite direction, the contact between the movable contact part 22 and the fixed contact part 32 is released, and when the pressure applied to the mover 2 is lowered, the return member 42 tends to return to its original state. Due to this, it is possible to form a distance between the mover 2 and the stator 3 more quickly.

As shown in FIGS. 4 and 5, the return member 42 is coupled to a spring 421 provided to surround the rod 23 and the rod 23, and is coupled to the rod 23 by movement of the rod 23. It may include a pressure plate 422 that presses the spring 421, and a support plate 423 having a through hole 423a through which the rod 23 passes and supporting an end portion of the spring 421. there is.

Specifically, the return member 42 includes a spring 421 provided to surround the rod 23, and when the pressure applied to the mover 2 is lowered, the mover ( 2) and the stator 3 can be quickly released. In addition, when the mover 2 is pressurized, as the pressurization progresses by the resistance force of the spring 421, the moving means moves more delicately than the movement, so that the contact reliability increases.

In addition, since the spring 421 is not provided outside the circuit breaker, but is provided in the space 11 of the circuit breaker, it is possible to prevent the spring 421 from being rusted due to contact with oxygen and moisture.

Since the occurrence of rust is prevented as described above, the spring 421 does not require maintenance related to rust, improving maintainability.

In addition, the return member 42 may further include a pressure plate 422 that is coupled to the rod 23 and presses the spring 421 by moving the rod 23 .

As shown in FIGS. 5 and 6 , since the rod 23 is not formed to have a certain thickness, a portion thicker than the portion of the rod 23 inserted into the pressing plate 422 exists. Therefore, when the rod 23 is pressurized by the moving means, the thick part of the rod 23 is caught on the pressure plate 422. The pressure plate 422 is also pressed and descends downward, and the spring 421 is pressed by the pressure plate 422 . Thereafter, the line may be opened and closed by contact between the stator 3 and the mover 2 .

In one embodiment, the pressure plate 422 may further include a support portion 422c formed vertically downward from the pressure surface and supporting the rod 23 . Straightness is given so that the rod 23 can accurately move to the support plate 423 and the stator 3 to be described later through the support portion 422c.

In another embodiment, the support portion 422c may be provided with a screw thread to be coupled and fixed to the rod 23 . The rod 23 and the support are fixed by screwing to increase the bonding force between the rod 23 and the pressure plate 422, and as the rod 23 moves up and down, the pressure plate 422 also moves together, so that the spring 421 ) is pressurized, so when the contact between the mover 2 and the stator 3 is released by current interruption, the pressure plate 422 and the load coupled to the pressure plate 422 by the elastic force of the spring 421 ( 23) can be moved away from the stator (3).

In addition, the return member 42 is disposed at a distance from the pressure plate 422 and has a through hole through which the rod 23 passes, but further includes a support plate 423 supporting the end of the spring 421. can The support plate 423 is disposed at a distance from the pressure plate 422, and the distance may change due to the elastic force of the spring 421.

By further including the support plate 423, the spring 421 may be provided to wrap the spring 421 around the rod 23 without the spring 421 being provided in direct contact with the outer surface of the rod 23.

In addition, the support plate 423 has a through hole 423a through which the rod 23 passes, so that the rod 23 can be inserted into the support plate 423, and the rod 23 is no longer in the thick portion. Since (23) is configured so that it cannot be separated, it provides an effect of giving safety to contact. In addition, since the support plate 423 supports the lower part of the spring 421, the spring 421 is prevented from being dropped and contacting the stator 3.

At least one of the pressure plate 422 and the support plate 423 may include an extended portion 422b.

In one embodiment, an extension portion 422b extending from the pressure surface of the pressure plate 422 in a direction in which the spring 421 is installed may be included. Due to the above configuration, a step is formed on the outer circumferential surface of the pressure plate 422 so that the upper portion of the spring 421 can be fitted to the pressure plate 422, so that the spring 421 is coupled to the pressure plate 422 without additional tools. It can be made, and since it is provided by fitting, it provides an effect of easy installation. In addition, when the spring 421 is pressurized by the pressure plate 422, the spring 421 and the pressure plate 422 are fitted, so that the coupling force between the pressure plate 422 and the spring 421 is also increased.

In another embodiment, the support plate 423 may include an extension portion 423b extending in a direction in which the spring 421 is installed. Due to the above configuration, the spring 421 is fitted to the support plate 423 to add ease of installation, and in addition, whenever the spring 421 is pressed, the support plate 423 and the spring 421 are fitted This has the effect of increasing the coupling force between the support plate 423 and the spring 421 .

Next, referring to FIGS. 2 and 3 , the moving member 41 and how the mover 2 moves through the moving member 41 will be described.

The movable member 41 includes a rotational shaft 411 provided perpendicularly to the circuit breaker and rotated by a motor, and a first linker having one end connected to the rotational shaft 411 and rotated by the rotational shaft 411 ( 412), and a second linker 413, one end of which is connected to the other end of the first linker 412 and which linearly moves by the rotation of the first linker 412, and one end of the second linker 413. The mover 2 includes a cam 414 connected to the other end, rotated by the linear motion of the second linker 413, and the other end connected to the rod 23, so that the mover 2 moves linearly with the stator 3 can do.

Specifically, when the rotary shaft 411 rotated by the motor rotates, the first linker 412, one end of which is vertically connected to the rotary shaft 411, rotates according to the rotation direction of the rotary shaft 411, and the first linker 412 One end of the second linker 413 is connected to the other end of ), and the second linker 413 moves linearly according to the displacement of the other end of the first linker 412 caused by rotation of the first linker 412. . Thereafter, the linear motion of the second linker 413 is converted into a rotational motion by the cam 414 .

The cam 414 may include a pivot shaft fixed to the space portion 11, a first end connected to the other end of the second linker 413, and a second end connected to the rod 23.

When the second linker 413 moves in a straight line, the rotation axis of the cam 414 is fixed to the space portion 11 so that the first and second ends rotate around the rotation axis, and the second end rotates. By doing so, the rod 23 can move up and down.

The movable member 41 may generate several motions using one motor, including the rotating shaft 411, the first linker 412, the second linker 413, and the cam 414.

In addition, the movable member 41 can drive a plurality of rods 23 using one rotational shaft 411, thereby reducing energy and increasing work efficiency.

In one embodiment, the first nut 51 provided under the support plate 423, the second nut 52 provided under the first nut 51, and the first nut 51 and the second nut A rubber 53 provided between the 52 may be further included.

A rubber 53 is further included between the first nut 51 and the second nut 52 to reduce vibration and shock generated when the mover 2 contacts the stator 3. can play a role

In another embodiment, a fixing member 7 provided above the pressing plate 422 and connecting the rod 23 and the cam 414 and between the pressing plate 422 and the fixing member 7 A washer 6 provided in may be further included.

A washer 6 is further included between the pressure plate 422 and the bolt to evenly distribute the pressure applied to the pressure plate 422, so that the pressure plate 422 is damaged due to vibration transmitted from the moving means has the effect of preventing

The present invention described above with reference to the accompanying drawings is capable of various modifications and changes by those skilled in the art, and such modifications and changes not limited by the claims should be construed as being included in the scope of the present invention.

CB: Breaker
DS: disconnector
1: housing
11: space part 11
2: mover
21: vacuum part 22: movable contact part
23: load
3: stator
32: fixed contact
4: driving means
41: moving member 411: rotation shaft
412: first linker 413: second linker
414: cam
42: return member
421: spring 422: pressure plate
423: support plate
51: first nut 52: second nut
53: rubber
6: washer
7: fixing member

Claims (4)

In the gas insulated switchgear including a circuit breaker for opening and closing load current and blocking fault current and a grounding-disconnector for opening and closing a line at no load,
the circuit breaker,
a housing including a space;
a mover disposed in the space and including a vacuum part provided therein, a movable contact part provided at one end, and a rod connected to the movable contact part and at least partially embedded in the vacuum part;
a stator disposed apart from the movable member and including a fixed contact portion contacting the movable contact portion; and
a driving means including a moving member for moving the rod toward the stator and a return member provided in the vacuum unit and returning the rod;
including,
The moving member,
a rotating shaft provided perpendicularly to the circuit breaker and rotated by a motor;
A first linker having one end connected to the rotation shaft and rotating by the rotation shaft;
a second linker having one end connected to the other end of the first linker and linearly moving by rotation of the first linker; and
The first end is connected to the other end of the second linker, and the second end includes a cam connected to the rod,
The return member includes a spring provided to surround the rod, a pressure plate coupled to the rod and pressurizing the spring by movement of the rod, and a through hole through which the rod passes and supporting an end of the spring. Including a support plate,
At least one of the pressure plate and the support plate includes an extended extension,
The pressing plate is formed vertically downward from the pressing surface and includes a support portion supporting the rod,
The support portion is provided with a screw thread and is screwed to the rod,
Further comprising a first nut provided under the support plate, a rubber provided under the first nut, and a second nut provided under the rubber,
A gas insulated switchgear, characterized in that it further comprises a fixing member provided above the pressure plate and connecting the rod and the cam, and a washer provided between the pressure plate and the fixing member. delete delete delete

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