Grounding switch device

Abstract

The present invention relates to a grounding switching device in which an arc induction part is provided inside a fixed part, and when a movable-side contact approaches or moves away from the fixed-side contact, the fixed-side contact is prevented from being damaged by inducing an arc generated by the movable-side contact to the arc induction part side.

Description

Technical Field

[0001] The present invention relates to a grounding switch device, and in particular, to a grounding switch device, wherein an arc inducing portion is arranged inside a fixed portion, and when a movable side contact approaches or moves away from a fixed side contact, the arc generated by the movable side contact is induced to the arc inducing portion, thereby preventing the fixed side contact from being damaged. Background Art

[0002] Generally, gas insulated switchgear (GIS) is installed on the power lines of indoor and outdoor power plants and substations, and is configured to manually switch the load current under normal use. In addition, it is also a switchgear for ultra-high voltage power systems, which can safely cut off the current when an abnormal current such as an accident or short circuit occurs, thereby protecting the power system and power equipment.

[0003] The gas insulated switchgear is composed of switchgear such as a circuit breaker (CB), a disconnector (DS), a current transformer (CT), an earthing switch (ES), and a busbar in a sealed metal tank filled with an inert gas.

[0004] There are two types of grounding switches. One is the equipment grounding switch, which is installed between the circuit breaker and the disconnector and on the busbar. When the circuit breaker, disconnector and busbar are maintained, the circuit is grounded to ensure the safety of the staff. The other is the line grounding switch, which is installed on the line side of the UHV transmission line. In addition to performing the grounding function of the equipment grounding switch, it also performs the input function of the fault current.

[0005] The grounding switch is arranged inside the gas insulated switchgear. When abnormal voltage, accident or other maintenance inspection occurs, the main circuit is grounded for safety, thereby preventing safety accidents.

[0006] The above-mentioned grounding switch is configured to include: a mover that reciprocates through the operation of the manipulator; a movable side contact that contacts the above-mentioned mover in the open state; a fixed side contact that contacts or disengages through the reciprocating movement of the above-mentioned mover; and a connecting rod that conducts current to the grounding side in the input (closed) state.

[0007] For the above-mentioned grounding switch, in the open state, when the operator is actuated according to an input signal, the mover connected to the operator slides and is inserted into the fixed-side contact.

[0008] The current direction is conducted to the ground side through the fixed side contact, the mover, the movable side contact, and the connecting rod.

[0009] On the contrary, the cutting operation is that in the input state, when the manipulator acts according to the opening signal, the mover slides in the opposite direction and separates from the fixed side contact, and cuts off the flow of current.

[0010] When the movable contact and the fixed contact of the grounding switch move closer to or farther away from each other, an arc may be generated.

[0011] That is, in the early stage of arc generation, the arc mainly occurs at the contact point between the movable side contact of the mover and the fixed side contact of the stator, but when the arc continues to occur, the arc heat will be transmitted to the contacts that conduct the main circuit current (movable side contact and fixed side contact), causing contact burning.

[0012] In order to solve these problems, Korean Utility Model Publication No. 20-0411499 discloses a grounding switch having an arc inducing portion (pre-arcing contact) inside a stator.

[0013] The existing grounding switch is configured such that a pre-arc contact corresponding to the movable contact of the movable part is formed in the vertical direction at the central part of the contact finger forming the fixed part, a coupling groove for the pre-arc contact to be inserted and coupled is formed at a certain depth below the above-mentioned movable contact, and a cutting groove is formed on the upper part of the pre-arc contact so that the pre-arc contact can be flexibly inserted into the coupling groove.

[0014] However, in the existing grounding switch including the pre-arc contact, since the pre-arc contact and the fixed side contact are arranged on the same line, there is a problem that the pre-arc generated in an irregular manner is not only generated on the pre-arc contact, but also on the fixed side contact, thereby possibly damaging the fixed side contact.

[0015] In addition, since the conventional grounding switch device adopts a structure in which the pre-arcing contact is inserted into the communicating hole of the mover, there is a problem that the degree of freedom in designing the pre-arcing contact is limited.

[0016] In addition, since the pre-arc contact is formed smaller than the above-mentioned movable side contact, there is a problem that the performance of inducing the pre-arc is reduced. Summary of the invention

[0017] Problems to be solved by the invention

[0018] Therefore, the object of the present invention is to solve the problems existing in the above-mentioned prior art and to provide a grounding switch device, which has an arc inducing part inside the fixed part. When the movable side contact approaches or moves away from the fixed side contact, the arc generated by the movable side contact is induced to the arc inducing part, thereby preventing the fixed side contact from being damaged.

[0019] Solutions for solving problems

[0020] According to the characteristics of the present invention for achieving the above-mentioned purpose, the grounding switch device of the present invention includes: a shell; a movable part, which is arranged inside the above-mentioned shell and can reciprocate through a manipulator, and the end of the above-mentioned movable part has a movable side contact; a fixed part, which is arranged to be separated from the above-mentioned movable part by a predetermined interval and has a fixed side contact that is selectively grounded or disconnected from the above-mentioned movable side contact as the above-mentioned movable part reciprocates; and an arc inducing part, which is arranged inside the above-mentioned fixed side contact and can be raised and lowered inside the above-mentioned fixed side contact, and when the above-mentioned movable side contact approaches or moves away from the above-mentioned fixed side contact, an arc generated in the above-mentioned movable side contact is induced.

[0021] The above-mentioned arc inducing part includes: an arc inducing body, which is arranged inside the above-mentioned fixed part, and an elastic member mounting groove is formed on the upper surface of the above-mentioned arc inducing body, and a lifting rod guide groove is formed on the lower surface; the lifting rod is formed in a rod shape, is arranged inside the above-mentioned arc inducing body, and can move up and down along the above-mentioned lifting rod guide groove; an arc inducing head is fixedly set at the end of the above-mentioned lifting rod, is made of conductive material, and induces an arc when it is adjacent to the above-mentioned movable side contact; an elastic member, which is made of an elastomer, is arranged inside the above-mentioned elastic member mounting groove, and one end of the above-mentioned elastic member is in contact with one side of the above-mentioned arc inducing head to elastically support the above-mentioned arc inducing head.

[0022] The arc induction head is arranged to protrude upward more than the fixed-side contact.

[0023] A fluid containing portion is further provided inside the movable portion. The fluid containing portion is formed as an empty space and is filled with a fluid.

[0024] A fluid injection hole is also provided on one side of the fluid containing part. The fluid injection hole is formed long in the up and down direction inside the movable part. One end of the fluid injection hole is connected to the fluid containing part, and the other end is connected to the outside to inject the fluid to the arc inducing part.

[0025] The fluid filled in the fluid containing portion is ejected toward the arc inducing portion when the fixed-side contact and the movable-side contact are separated from each other.

[0026] The fluid is composed of insulating gas and is sprayed below the movable contact to suppress the generation of arc.

[0027] Effects of the Invention

[0028] The grounding switch device of the present invention has the following effects.

[0029] The advantage of the grounding switch device of the present invention is that an arc inducing part is arranged inside the fixed part. When the movable side contact approaches or moves away from the fixed side contact, the arc generated by the movable side contact is induced to the arc inducing part side, thereby preventing the fixed side contact from being broken or damaged due to the arc.

[0030] In addition, the arc induction head of the arc induction part is disposed inside the fixed part so as to be movable up and down. Therefore, even after the movable contact and the fixed contact are disconnected, the movable contact and the arc induction head are still grounded, thereby minimizing the arc generated on the fixed contact side.

[0031] In addition, after the movable side contact and the arc inducing part are disconnected, a fluid composed of insulating gas is sprayed toward the arc inducing part to suppress the generation of arc, thereby preventing the movable side contact from being damaged or broken due to the generation of arc. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 1 and 2 are a front view and a cross-sectional view showing the structure of a preferred embodiment of a grounding switch device according to the present invention.

[0033] Figure 2 1 is a cross-sectional view showing the structure of a movable portion and a fixed portion constituting an embodiment of the present invention.

[0034] Figure 3 It is a cross-sectional view showing a grounded state of a movable side contact and a fixed side contact constituting an embodiment of the present invention.

[0035] Figure 4 It is a cross-sectional view showing a disconnected state of a movable side contact and a fixed side contact constituting an embodiment of the present invention.

[0036] Figure 5 1 is a cross-sectional view showing the state of the fluid as the movable side contact and the fixed side contact constituting the embodiment of the present invention are disconnected. DETAILED DESCRIPTION

[0037] In the following, some embodiments of the present invention are described in detail in conjunction with the exemplary drawings. It should be noted that when adding reference numerals to the components in the drawings, even if the same components are shown in different drawings, the same symbols are given as much as possible. In addition, when describing the embodiments of the present invention, if it is determined that the detailed description of the relevant known configuration or function will hinder the understanding of the embodiments of the present invention, the detailed description will be omitted.

[0038] In addition, when describing the components of the embodiments of the present invention, terms such as 1st, 2nd, A, B, (a), (b) and the like may be used. These terms are only used to distinguish one component from other components and do not limit the nature, order or sequence of the components. When it is recorded that a component is "connected", "combined" or "accessed" to other components, it should be understood that the component can be directly connected or accessed to the other component, but there may also be another component "connected", "combined" or "accessed" between the components.

[0039] Figure 1 are a front view and a cross-sectional view showing the structure of a preferred embodiment of a grounding switch device according to the present invention; Figure 2 is a cross-sectional view showing the structure of a movable portion and a fixed portion constituting an embodiment of the present invention; Figure 3 is a cross-sectional view showing a grounded state of a movable side contact and a fixed side contact constituting an embodiment of the present invention; Figure 4 is a cross-sectional view showing a disconnected state of a movable side contact and a fixed side contact constituting an embodiment of the present invention; Figure 5 1 is a cross-sectional view showing the state of the fluid as the movable side contact and the fixed side contact constituting the embodiment of the present invention are disconnected.

[0040] As shown in the figure, a grounding switch device according to the present invention is disclosed, which is characterized in that it includes: a shell 10; a movable part 20, which is arranged inside the above-mentioned shell 10, can reciprocate through a manipulator, and has a movable side contact 30 at the end; a fixed part 40, which is arranged to be separated from the above-mentioned movable part 20 by a predetermined interval, and has a fixed side contact 44 that is selectively grounded or disconnected from the above-mentioned movable side contact 30 as the above-mentioned movable part 20 reciprocates; and an arc inducing part 50, which is arranged inside the above-mentioned fixed side contact 44, and can be raised and lowered inside the above-mentioned fixed side contact 44, and when the above-mentioned movable side contact 30 approaches or moves away from the above-mentioned fixed side contact, an arc generated in the above-mentioned movable side contact 30 is induced.

[0041] The housing 10 is chamber-shaped and has an outer appearance, and an internal space 12 is formed therein. A manipulator 14 and a movable part 20 are arranged inside the internal space 12. The manipulator 14 is a manipulator of a general grounding switch device, and its detailed description is omitted. The manipulator 14 is fixedly arranged on one side of the movable part 20, and is used to manipulate the movable part 20 to reciprocate in the up and down directions.

[0042] like Figure 2 As shown, the movable portion 20 includes a movable body portion 22 , a fluid containing portion 24 , a movable side contact 30 , and the like.

[0043] The movable body part 22 is cylindrical and is formed long in the vertical direction. The movable body part 22 is provided inside the housing 10 and is a part that moves up and down as the manipulator 14 operates.

[0044] In addition, along with the vertical movement of the movable body portion 22 , grounding and disconnection operations of the movable-side contacts 30 and the fixed-side contacts 44 described later can be realized.

[0045] A fluid containing part 24 is formed inside the movable body part 22. The fluid containing part 24 is formed as a cylindrical empty space inside the movable body part 22. The inside of the fluid containing part 24 is a portion filled with a fluid 26 described later.

[0046] The fluid 26 is a general insulating gas, and its detailed description is omitted. The fluid 26 is filled in the fluid containing part 24 and is ejected toward the bottom of the movable part 20 by a piston ejection method. The fluid 26 is composed of an insulating gas, and the fluid 26 is ejected toward the bottom of the movable part 20 to suppress the generation of arcs.

[0047] A fluid injection hole 28 is formed at the bottom of the fluid receiving portion 24. The fluid injection hole 28 is formed to penetrate the movable body portion 22 in the vertical direction at the center thereof. One end of the fluid injection hole 28 is connected to the fluid receiving portion 24, and the other end is connected to the outside of the movable portion 20.

[0048] The fluid injection hole 28 is communicated with the fluid receiving portion 24 , and functions as a passage for guiding the fluid 26 to be injected downwardly of the movable portion 20 when the fluid 26 is injected.

[0049] A movable side contact 30 is provided on the lower surface of the movable body portion 22. The movable side contact 30 is cylindrical and fixedly provided on the lower surface of the movable body portion 22. The movable side contact 30 is a general movable side contact, and its detailed description is omitted. The movable side contact 30 selectively contacts with the fixed side contact 44 described later as the movable body portion 22 moves up and down, thereby playing the role of energizing during the grounding operation.

[0050] A fixing portion 40 is disposed below the movable portion 20. Figure 3 As shown, the fixed portion 40 includes a fixed shielding portion 42 , a fixed side contact 44 , an arc inducing portion 50 , and the like.

[0051] The fixed shielding part 42 is substantially in the shape of a hollow cylinder, and multiple components are arranged inside the fixed shielding part 42. Multiple components are arranged and protected inside the fixed shielding part 42.

[0052] A fixed side contact 44 is provided inside the fixed shielding part 42. The fixed side contact 44 is a general fixed side contact, and its detailed description is omitted. The fixed side contact 44 is made of a conductive material and is formed in a circular ring shape. The fixed side contact is placed at the upper end of the fixed shielding part 42, and the movable side contact 30 is accommodated inside the fixed side contact to achieve grounding and power supply.

[0053] The fixed-side contact 44 is provided with an arc induction portion 50. The arc induction portion 50 includes an arc induction body 52, a lifting rod 58, an arc induction head 62, an elastic member 64, and the like.

[0054] The arc induction body 52 is cylindrical and is disposed inside the fixed shielding part 42. The arc induction body 52 is disposed inside the fixed shielding part 42 and plays the role of guiding the vertical movement of the lifting rod 58 described later and supporting the elastic member 64 described later.

[0055] An elastic member installation groove 54 is formed on the upper surface of the arc induction body 52. ​​The elastic member installation groove 54 is formed by being recessed to a predetermined depth and is a portion for accommodating a part of an elastic member 64 to be described later.

[0056] A lifting rod guide groove 56 is formed on the lower surface of the arc induction body 52. ​​The lifting rod guide groove 56 is cylindrical and recessed to a predetermined depth at the center of the bottom surface of the arc induction body 52. ​​A part of the lifting rod 58 described later is arranged inside the lifting rod guide groove 56, which is a part that guides the lifting rod 58 to move up and down.

[0057] A lifting rod 58 is provided inside the lifting rod guide groove 56. The lifting rod 58 is formed in a rod shape and is formed long in the vertical direction. A portion of the lifting rod 58 is provided in the lifting rod guide groove 56. The remaining portion of the lifting rod 58 protrudes toward the upper side of the arc induction body 52 through a lifting hole 60 that penetrates vertically at the center of the upper surface of the arc induction body 52.

[0058] The lifting rod 58 is provided on the arc induction body 52 so as to be movable up and down, and plays a role in moving an arc induction head 62 described later up and down.

[0059] An arc inducing head 62 is fixedly provided at the upper end of the lifting rod 58. The arc inducing head 62 is cylindrical and made of a conductive material. The arc inducing head 62 is fixedly provided at the upper end of the lifting rod 58. The arc inducing head 62 is arranged to be able to move up and down inside the fixed side contact 44 as the lifting rod 58 moves up and down. The arc inducing head 62 is arranged above the fixed side contact 44. The arc inducing head 62 is arranged to be adjacent to the movable side contact 30 before the fixed side contact 44 when the movable side contact 30 is adjacent to the fixed side contact 44 for grounding operation. Therefore, the arc inducing head 62 plays a role in inducing an arc that may be generated in the movable side contact 30. (Refer to Figure 4 )

[0060] An elastic member 64 is disposed inside the elastic member installation groove 54. The elastic member 64 is a general spring, and its detailed description is omitted. One end of the elastic member 64 is in contact with the bottom surface of the elastic member installation groove 54, and the other end is in contact with the lower surface of the arc induction head 62. The elastic member 64 is disposed at the bottom of the arc induction head 62, and plays a role in elastically supporting the arc induction head 62 upward.

[0061] That is, since the arc induction head 62 is elastically supported by the elastic member 64, during the grounding operation, the movable side contact 30 and the arc induction head 62 are kept in contact with each other, and the arc induction head 62 can move downward. As a result, the fixed side contact 44 and the movable side contact 30, which are arranged below the arc induction head 62, can perform the grounding operation.

[0062] refer to Figures 1 to 5 , the function of the grounding switch device of the present invention having the above-mentioned structure is described below.

[0063] First, the grounding switch device operates in a grounding state and an open state. For the grounding state of the grounding switch device, the manipulator 14 operates according to the grounding signal. And, as the manipulator 14 operates, the movable part 20 provided on the manipulator 14 in a manner capable of reciprocating up and down moves linearly downward.

[0064] like Figure 4 As shown, the movable portion 20 gradually moves downward and contacts the arc induction tip 62 before being grounded to the fixed contact 44 . Thus, the arc (ARC) generated at the movable contact 30 is induced to the arc induction tip 62 .

[0065] The movable side contact 30 and the arc induction head 62 remain in contact with each other, and the movable side contact 30 continues to move downward, and finally Figure 3The shown contact is grounded to the fixed-side contact 44, thereby completing the grounding operation.

[0066] On the contrary, in the disconnected state of the grounding switch device, the manipulator 14 operates according to the disconnection signal. As the manipulator 14 operates, the movable part 20 provided on the manipulator 14 so as to be able to reciprocate up and down moves linearly upward.

[0067] like Figure 5 As shown, the movable part 20 gradually moves upward and is disconnected from the fixed-side contact 44. At this time, even if the movable-side contact 30 is disconnected from the fixed-side contact 44, the movable-side contact 30 and the arc induction head 62 remain in contact.

[0068] That is, since the arc induction head 62 is disposed above the fixed-side contact 44 , even after the fixed-side contact 44 and the movable-side contact 30 are disconnected, the movable-side contact 30 and the arc induction head 62 can still maintain a contact state.

[0069] When the movable contact 30 moves upward for a certain distance or more, the movable contact 30 and the arc induction head 62 are disconnected. At the same time, the fluid 26 filled in the fluid containing part 24 is ejected downward, thereby suppressing the arc generated during the disconnection operation.

[0070] Therefore, the grounding switch device of the present invention is provided with an arc inducing portion 50 inside the fixed portion 40. When the movable side contact 30 approaches or moves away from the fixed side contact 44, the arc generated by the movable side contact is induced to the arc inducing portion 50, thereby preventing the fixed side contact 44 from being broken or damaged due to the generation of the arc.

[0071] In addition, the arc inducing head 62 of the arc inducing part 50 is movably arranged up and down inside the above-mentioned fixed part 40. Even after the movable side contact is disconnected from the fixed side contact, the movable side contact 30 and the arc inducing head 62 still remain grounded, thereby minimizing the arc generated at the fixed side contact 44.

[0072] In addition, after the movable side contact 30 and the arc inducing part 50 are disconnected, the generation of arc is suppressed by spraying a fluid 26 composed of insulating gas toward the arc inducing part 50, thereby minimizing the damage and breakage of the movable side contact 30 caused by the generation of arc.

[0073] The scope of the present invention is not limited to the above-mentioned exemplary embodiments. For those skilled in the art, various other modifications can be made based on the present invention within the above-mentioned technical scope.

Claims

1. A grounding switch device, include: case; A movable part, arranged inside the housing, capable of reciprocating motion by a manipulator, the end of the movable part having a movable side contact; a fixed portion which is arranged to be spaced apart from the movable portion by a predetermined interval and has a fixed-side contact which is selectively grounded or disconnected from the movable-side contact as the movable portion reciprocates; and The arc inducing portion is arranged inside the fixed side contact and can be raised and lowered inside the fixed side contact. When the movable side contact approaches or moves away from the fixed side contact, the arc generated in the movable side contact is induced.

2. The grounding switch device according to claim 1, It is characterized in that The arc inducing portion is provided to protrude further upward than the fixed-side contact.

3. The grounding switch device according to claim 1, It is characterized in that The arc inducing portion is provided so as to be elastically supported in a direction toward the movable-side contact.

4. The grounding switch device according to claim 1, It is characterized in that The arc inducing portion comprises: An arc induction body is arranged inside the fixing part, an elastic member installation groove is formed on the upper surface of the arc induction body, and a lifting rod guide groove is formed on the lower surface; A lifting rod, formed in a rod shape, is disposed inside the arc induction body and can move up and down along the lifting rod guide groove; An arc induction head, fixedly disposed at the end of the lifting rod, made of a conductive material, and inducing an arc when in abutment with the movable side contact; The elastic member is made of an elastomer and is arranged inside the elastic member installation groove. One end of the elastic member is in contact with one side of the arc induction head to elastically support the arc induction head.

5. The grounding switch device according to claim 1, It is characterized in that A fluid containing part is further provided inside the movable part. The fluid containing part is formed as an empty space and is filled with a fluid.

6. The grounding switch device according to claim 5, It is characterized in that A fluid injection hole is also provided on one side of the fluid containing part. The fluid injection hole is formed long in the up and down direction inside the movable part. One end of the fluid injection hole is connected to the fluid containing part, and the other end is connected to the outside to inject the fluid into the arc inducing part.

7. The grounding switch device according to claim 5, It is characterized in that When the fixed-side contact and the movable-side contact are separated from each other, the fluid filled in the fluid accommodation portion is ejected to the arc induction portion.

8. The grounding switch device according to claim 7, It is characterized in that The fluid is composed of an insulating gas and is sprayed under the movable-side contact to suppress the generation of an arc.

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