KR20090055981A

KR20090055981A - Circuit breaker for gas insulated switchgear

Info

Publication number: KR20090055981A
Application number: KR1020070122896A
Authority: KR
Inventors: 이명룡
Original assignee: 주식회사 신효
Priority date: 2007-11-29
Filing date: 2007-11-29
Publication date: 2009-06-03

Abstract

A circuit breaker for a gas insulated switch gear is provided to prevent operation failure due to oil leakage through a mechanical structure. A motor assembly(1) comprises a motor(10) and a driving gear, and a driven gear(21) is engaged with the driving gear. A cam(23) and a close latch(24) are installed on a main shaft(22), and a closing spring(30) is compacted in rotation of the main shaft. A toggle joint(41) delivers pushing force to an opening spring(50) which is compacted in rotation of a toggle joint. A control cam(6) is turned with a main shaft, and a closing limit switch and an opening limit switch perform switching operation according to the rotation position of the control cam. A closing latch assembly(8) restricts a closed latch in switching of the closing limit switch, and an opening latch assembly(9) releases the open latch(43) in order to block a fault current.

Description

Circuit Breaker for Gas Insulated Switchgear {Circuit Breaker for Gas Insulated SwitchGear}

The present invention is applied to a gas insulated switchgear (GIS) that is installed in a power distribution facility that supplies a large amount of power to a large plant and a building to block an accident current to protect main equipment at a rear end. To a circuit breaker.

In general, in the transmission and distribution power system, which is a power system for supplying power to mechanical and electrical devices in industrial sites and homes, electrical accidents such as tree contact, lightning, vehicle accidents, wind, heat, etc. There is always a risk of a short circuit, a ground fault, a ground fault, etc. Since the fault current generated by the power system accident causes electrical or mechanical damage to the connected equipment, the faulty line section should be separated from the system promptly to fix the accident.

The gas insulated switchgear (hereinafter referred to as 'GIS'), which is widely used for this purpose, applies the excellent physical and electrical properties of SF6, an inert gas, to safely open and close the switch even in abnormal conditions such as short-circuit accidents as well as normal current interruption. It is used as a transformer complex mechanical device of over 170 [kV] class to protect the system

Among the basic components of the GIS, the grounded aluminum or steel enclosure serves as a container for compressed SF6 gas, which is currently the most active electrical insulating medium.

At the center of the vessel, aluminum or aluminum alloy conductors are supported by epoxy insulators (conical in the case of phase-separated, disc-shaped in the three-phase batch). The SF6 gas compressed in the container has a high dielectric strength and quickly returns to its original dielectric strength even after an arc is generated. This SF6 gas has a stable molecular composition and is a colorless, odorless insulating medium.

The main advantage of the GIS is that the space required by the GIS is significantly reduced to about 10 to 15 [%] of the space of the existing existing outdoor substation, and it has high flame resistance, low maintenance, and safety for human contact. It also has a number of benefits, including no disruption to radio / TV.

On the other hand, the hydraulic circuit breaker (Circuit Breaker) applied to the opening and closing of the converter to the GIS has been mainly used oil, but the hydraulic circuit breaker is expensive, if the leakage occurs Pollution of the environment, there is a problem that is difficult to maintain and repair.

The present invention is to solve the above problems, the circuit breaker is applied to the gas insulated switchgear is installed in the power distribution equipment for supplying a large amount of power to the super-large plant and building to block the accident current to protect the main equipment of the rear stage The mechanical structure of the circuit breaker, unlike the conventional hydraulic circuit breaker, eliminates the malfunction caused by oil leakage, provides a reliable circuit breaker that can be implemented at a low cost and high voltage breaking system with excellent breaking performance. have.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

In order to achieve the above object, the present invention includes a motor assembly including a motor and a drive gear connected to the motor to rotate under the driving force of the motor; A main shaft assembly including a driven gear which is engaged with the drive gear and rotates, a main shaft installed therethrough, and a cam and a closing latch installed on the main shaft; A closing spring assembly including a closing spring coupled to the main shaft and compressed during rotation of the main shaft according to driving of the motor; Toggle joint is installed to contact the cam that rotates when the main shaft rotates in the direction in which the closing spring is tensioned to convert the rotational force to a pushing force, and installed through it so as to rotate together with the toggle joint An opening shaft assembly including an opening shaft, and an open latch installed on the opening shaft; An opening spring assembly connected to the toggle joint and including an opening spring compressed according to rotation of the toggle joint; A control cam installed to rotate together when the main shaft rotates; A limit switch assembly including a closing limit switch switching according to a rotational position of the control cam, and an opening limit switch switching according to the rotational position of the control cam; A closing latch assembly configured to restrain the closing latch during a switching operation of the closing limit switch according to the rotation of the control cam; A circuit breaker for a gas insulated switchgear is provided, comprising an opening latch assembly for releasing the open latch to block it in the event of an accident current so that the opening spring relaxes in a compressed state.

At this time, the closing spring is characterized in that it has a larger spring constant than the opening spring.

In addition, the circuit breaker for the gas insulated switchgear of the present invention is characterized in that it further comprises an indicator assembly having an indicator for indicating the power-on and shut-off state in conjunction with the rotation of the main shaft and the opening shaft.

In addition, the circuit breaker for the gas insulated switchgear according to the present invention further includes an auxiliary switch assembly including an auxiliary switch provided at the rear of the opening shaft assembly, and a link lever assembly installed at one side of the auxiliary switch assembly. However, the link lever assembly is connected to the indicator assembly, characterized in that the intermediate connecting portion of the link lever assembly is hinged to one end of the open latch.

In addition, the circuit breaker for the gas insulated switchgear according to the present invention is further characterized in that an interlock assembly interlocked with the indicator lever is coupled to an open latch at an operation of the link lever assembly.

On the other hand, the circuit breaker for gas insulated switchgear of the present invention is characterized in that a shock absorber is provided at the rear side of the toggle joint of the opening shaft assembly to mitigate an impact during a toggle action.

The effects of the present invention are as follows.

According to the present invention, it is possible to provide a circuit breaker for a gas insulated switchgear having a low cost and excellent breaking performance as a mechanical type.

That is, the circuit breaker for the gas insulated switchgear of the present invention is a circuit breaker that improves the operation method mechanically, and has excellent overall characteristics such as hysteresis, phase difference, response characteristic, withstand voltage, insulation resistance, reliability, durability, and manufacturing cost In addition, it is more economical than the conventional hydraulic circuit breaker, which is expensive, and the malfunction of oil leakage caused by the existing hydraulic type is eliminated, thereby providing a satisfactory effect in terms of reliability such as maintenance.

Hereinafter, with reference to the accompanying drawings, Figures 1 to 5 for a preferred embodiment of the present invention will be described in detail.

1 is a system configuration diagram of a gas switch insulation device to which a circuit breaker of the present invention is applied, wherein a container 100, a main bus 200, and a lightning arrester 300 filled with SF6 gas ( lightening arrestor, cable lead 400, voltage transformer 500, 3-position switch 600, current transformer 700, local control panel And (800) (local control pannel), and a circuit breaker (circuit breaker) of the present invention, represented by the 'A part'.

On the other hand, Figure 2 is an exploded perspective view of the circuit breaker of the present invention, Figure 3 is a plan view showing the configuration of the circuit breaker of the present invention, Figures 4a and 4b is a side view of the injection viewed from the 'ga' and 'b' direction of FIG. 4A is a side view showing the closing spring in the closing state, and FIG. 4B is a side view showing the opening spring in the closing state.

FIG. 5A is a view corresponding to FIGS. 4A and 4B, and FIG. 5A is a side view illustrating a closing spring state in an input standby state, and FIG. 5B is a side view illustrating an opening spring state in an input standby state.

Referring to these drawings, the circuit breaker for the gas opening and closing device of the present invention includes a motor 10 and a drive gear 11 connected to the motor 10 to rotate under the driving force of the motor 10. A motor assembly 1; The driven gear 21 engaged with the drive gear 11 to rotate, the main shaft 22 installed therethrough, and the cam 23 and the closed latch 24 installed on the main shaft 22 ( a main shaft 22 assembly 2 including a close latch; A closing spring assembly (3) coupled to the main shaft (22) and including a closing spring (30) that is compressed when the main shaft (22) rotates according to the driving of the motor (10); Toggle joint installed to contact the cam 23 that rotates when the main shaft 22 rotates in the direction in which the closing spring 30 is tensioned, and converts the rotational force into a pushing force and transmits it to the opening spring 50 side ( 41, a toggle joint, an opening shaft 42 installed therethrough so as to rotate together with the toggle joint 41, and an open latch 43 installed on the opening shaft 42. An opening shaft assembly 4 including; An opening spring assembly (5) connected to the toggle joint (41) and including an opening spring (50) compressed according to the rotation of the toggle joint (41); A control cam 6 installed to rotate together when the main shaft 22 rotates; A closing limit switch which performs a switching operation according to the rotational position of the control cam 6 so that the closing latch assembly restrains the closing latch 24, and is switched in accordance with the rotational position of the control cam 6 so that the motor 10 A limit switch assembly (7) comprising an opening limit switch to stop (); A closing latch assembly (8) which restrains the closing latch (24) during the switching operation of the closing limit switch according to the rotation of the control cam (6); It includes an opening latch assembly 9 for releasing the open latch 43 so that the opening spring 50 is relaxed in a compressed state to block the occurrence of an accident current.

In this case, the closing spring 30 has a larger spring constant as well as more effective turns than the opening spring 50. In addition, the closing spring and the opening spring is preferably made of SUP9A or SAE9254, and undergoes a process of removing stress after heat treatment during manufacture.

In addition, the open latch, the closed latch, the cam, the shaft, etc. are made of SCM415 and subjected to heat treatment to adjust the carburizing depth according to the purpose of use. Through this, the carburized portion is to maintain the hardness and wear resistance, and the non-carburized portion is to strengthen the tensile force, it is possible to prevent the shape deformation due to breakage and load caused by the impact.

On the other hand, the control cam 6 has a form in which two cam plates are spaced apart on the same axis, because each cam plate switches the closing limit switch and the opening limit switch, respectively.

In addition, the circuit breaker according to the present invention, in response to the rotational action of the main shaft 22 and the opening shaft 42 and the operation of the control cam 6 and the open latch 43 according to the operation of the power supply state and the disconnection state. It further comprises an indicator assembly (17) having an indicator (display) to be visible to the naked eye from the outside.

In addition, the circuit breaker of the present invention having the above-described configuration includes a base plate 15 and a plurality of partition walls 16 vertically installed in a state spaced apart from each other on the surface of the base plate 15, the partition wall On the 16, the mounting holes 16a and 16b which the main shaft 22 and the opening shaft 42 penetrate are formed, respectively.

In addition, the circuit breaker for the gas insulated switchgear according to the present invention includes an auxiliary switch assembly 18 provided behind the opening shaft assembly 4 to transfer the state of the circuit breaker to the outside, and the auxiliary switch assembly 18. ) And a link lever assembly (12) consisting of a plurality of link levers connecting the indicator assembly (17), wherein the intermediate connection portion of the link lever assembly (12) is hinged to one end of the open latch (43).

In addition, the circuit breaker for the gas insulated switchgear according to the present invention is interlocked when the link lever interlocked with the open latch 43 on one side of the indicator assembly 17 serves to prevent a malfunction of the circuit breaker. An interlock assembly 13 is further provided.

In addition, a shock absorber 14 is installed at the rear side of the toggle joint 41 of the opening shaft assembly 4 to mitigate an impact during the toggle action. On the other hand, the shock absorber can be installed in the rear of the main shaft assembly (3).

The operation of the circuit breaker for the gas insulated switchgear according to the present invention configured as described above will be described with reference to FIGS. 3 to 5.

First, referring to FIGS. 3, 4A, and 4B, when closing of the circuit breaker is completed, both the closing spring 30 and the opening spring 50 maintain the compressed state, and thus are coupled to the opening shaft 42. The movable contact 44 maintains an electrical connection with the terminal M on the main bus side.

In this case, the closing spring 30 is maintained in a compressed state by the closing latch assembly 8 which restrains the closing latch 24, and the opening spring 50 is opened by the opening latch assembly which restrains the open latch 43. 9) to maintain the compressed state.

In this state, if an accident current is generated and a converter blocking signal is applied, an electrical signal is applied to the solenoid 91 constituting the opening latch assembly 9 to operate, and the opening shaft 42 is linked thereto. The open latch 43 is released in the restrained state, and thus the opening spring 50 relaxes in the right direction in the drawing while rotating the toggle joint 41.

That is, when the solenoid 91 is applied to the solenoid 91 of the opening latch assembly 9 and the solenoid is operated, the opening spring 50 is released in a compressed state in association with the solenoid, and the coupling is coupled to the rotating shaft 42. The movable contact 44 is spaced apart from the main bus side terminal M to open the converter.

In this way, after the fault current is cut off, the circuit breaker should be switched to the closed state again to close the converter after the fault is cleared.

First, as the solenoid 81 is operated by a signal applied to the closing latch assembly 8 that restrains the closing latch 24, the closing latch 24 is out of the restrained state, and thus the closing spring 30 is closed. Is released in the compressed state (see FIG. 5A).

When power is applied to the motor 10 in this state, the driving gear 11 (ie, worm) connected to the motor 10 is rotated by receiving the driving force of the motor 10, and thus the The driven gear 21 (that is, the worm gear) engaged with the drive gear 11 is rotated.

Then, as the driven gear 21 rotates, the main shaft 22 coupled thereto also rotates, and the closing spring 30 that is coupled to the main shaft 22 in a relaxed state is compressed. At this time, the cam 23 and the closed latch 24 provided on the main shaft 22 also rotate.

As described above, when the main shaft 22 is rotated, the cam 23 installed on the main shaft 22 pushes the toggle joint 41 constituting the opening shaft assembly 4, and thus the toggle joint 41. Pushes the opening spring 50 in the compression direction.

At this time, as the opening shaft 42 coupled to the toggle joint 41 also rotates, the movable contact 44 coupled to the opening shaft 42 also rotates to approach the main bus side terminal M. FIG.

On the other hand, when the main shaft 22 is rotated as described above, the control cam 6 coupled to the end of the main shaft 22 also rotates, according to the rotation of the main shaft 22 of the opening spring 50 When the contact with the main bus side terminal M of the compression and movable contactor 44 is completed, the control cam 6 turns on or off the closing limit switch and the opening limit switch, and thus the motor 10 The power supply to the power supply is interrupted and the closing latch assembly 8 restrains the closing latch 24.

That is, the control cam 6 rotates to operate the closing limit switch and the limit switch. As a result, the closing limit switch operates the closing latch assembly 8 to restrain the closing latch 24. The power supply to the motor 10 is cut off.

On the other hand, when the converter opening and closing action by the closing and closing of the circuit breaker as described above, the indicator displays the opening and closing state (on / off) of the converter in conjunction with the operation of the various components including the main shaft (22).

As described above, the circuit breaker of the present invention has a driving mechanism is mechanically configured, the closing spring 30 and the opening spring 50 by the rotation of the main shaft 22 according to the drive of the motor 10 when the power is applied. This is compressed and the power is turned on. At this time, the opening limit switch is opened to stop the power supply of the motor. In addition, when the open signal is applied by an accident current in the power-on state, the opening shaft 42 rotates clockwise by the force of the compressed opening spring to open the contact to block the accident current.

The present invention is not limited to the above embodiments, and various changes and modifications can be made to various forms without departing from the scope of the technical idea of the present invention. That is, the rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and various changes and modifications can be made by those skilled in the art within the scope of the claims. It is self evident.

The circuit breaker for the gas switch isolation device of the present invention is a circuit breaker that implements excellent high voltage cut-off performance when applied to a large-capacity power supply facility. It is an invention that is highly applicable to the industry, such as to increase the localization rate.

1 is a system configuration diagram of a gas opening and closing insulation device to which the present invention is applied

2 is an exploded perspective view of a circuit breaker of the present invention;

3 is a plan view showing the circuit breaker configuration of the present invention, which is a plan view in a closing state.

4A and 4B are side views, respectively, as viewed from the 'a' and 'b' directions of FIG.

Figure 4a is a side view showing the closing spring in the closing state

Figure 4b is a side view showing the opening spring in the closing state

5A is a diagram corresponding to FIGS. 4A and 4B;

Fig. 5A is a side view showing the closing spring in the standby state for charging

Fig. 5B is a side view showing the opening spring in the standby state for charging

Explanation of symbols on the main parts of the drawings

1: motor assembly 2: main shaft assembly

3: closing spring assembly 4: opening shaft assembly

5: opening spring assembly 6: control cam

7: Limit switch assembly 8: Closing latch assembly

9: opening latch assembly 10: indicator assembly

11: Auxiliary switch assembly 12: Link lever assembly

13: Interlock Assembly 14: Shock Absorber

10: motor 11: drive gear

21: Follower gear 22: Main shaft

23: Cam 24: close latch

30: closing spring 41: toggle joint

42: opening shaft 43: open latch

44: movable contact 50: opening spring

Claims

A motor assembly including a motor and a drive gear connected to the motor to rotate under a driving force of the motor;

A main shaft assembly including a driven gear which meshes with the drive gear and rotates, a main shaft installed therethrough, and a cam and a close latch installed on the main shaft;

A closing spring assembly that is coupled to the main shaft and includes a closing spring that is compressed when the main shaft rotates according to the driving of the motor;

Toggle joint is installed to contact the cam that rotates when the main shaft rotates in the direction in which the closing spring is tensioned to convert the rotational force to a pushing force, and installed through it so as to rotate together with the toggle joint An opening shaft assembly including an opening shaft, and an open latch installed on the opening shaft;

An opening spring assembly connected to the toggle joint and including an opening spring compressed according to rotation of the toggle joint;

A control cam installed to rotate together when the main shaft rotates;

A limit switch assembly including a closing limit switch switching according to a rotational position of the control cam, and an opening limit switch switching according to the rotational position of the control cam;

A closing latch assembly configured to restrain the closing latch during a switching operation of the closing limit switch according to the rotation of the control cam;

A circuit breaker for a gas insulated switchgear, comprising an opening latch assembly for releasing the open latch to release the open spring so as to block it in the event of an accident current.

The method of claim 1,

And an indicator assembly having an indicator for indicating a power-on state and a shut-off state in association with the operation of the main shaft and the opening shaft.

The method of claim 1,

An auxiliary switch assembly including an auxiliary switch provided at the rear of the opening shaft assembly, and a link lever assembly including a plurality of link levers connecting the auxiliary switch assembly and the indicator assembly, wherein an intermediate connection portion of the link lever assembly is an open latch. A circuit breaker for a gas insulated switchgear, which is hinged at one end.

The method of claim 2,

One side of the indicator assembly, the circuit breaker for the gas insulated switchgear, characterized in that the interlock assembly is interlocked with the operation of the link lever assembly in conjunction with the open latch.

The method of claim 1,

A circuit breaker for a gas insulated switchgear, characterized in that a shock absorber is provided on the rear side of the opening shaft assembly to mitigate an impact during a toggle action.

The method of claim 1,

And the closing spring has a larger spring constant than the opening spring.