KR200406796Y1 - Disconnector for gas insulated switchgear - Google Patents

Abstract

The present invention relates to a disconnector having a bus loop current switching capability of a gas insulated switchgear (GIS), and has an auxiliary contactor having arc resistance on the fixed side to prevent damage to the main contact point by an arc during open operation. In addition, the auxiliary contactor moves in the opposite direction to the opening direction of the main contactor during opening, thereby shortening the opening time and the arc time of the disconnecting device, thereby minimizing damage to the contact.

The disconnecting device of the gas insulated switchgear according to the present invention comprises: an inner diameter for inserting a movable contactor, a movable side conductor having a fixed contact, a tension spring, and a shield provided at one outer peripheral surface of the inner diameter; An insertion hole for inserting the movable contactor, an auxiliary contactor fixed to a guide and a coil spring to move up and down inside the insertion hole, and having a contact on one side, a fixed contactor and a tension spring provided on an outer circumferential surface of the insertion hole; A fixed side conductor having a shield; And an inner diameter for inserting the auxiliary contactor is formed and a contact is formed on one side, and a contact mechanism between the contact of the auxiliary contactor and the contact is moved by a driving mechanism between the inner diameter of the movable side conductor and the insertion hole of the fixed side conductor. It includes; a movable contact to open and close the operation by the contact.

Gas Insulated Switchgear, Disconnector, Movable, Fixed, Movable Contactor, Contact

Description

Disconnector for gas insulated switchgear {DISCONNECTING SWITCH OF GAS INSULATED SWITCHGEAR}

1 is a partial cross-sectional view of a disconnector of a gas insulated switchgear according to the prior art.

Figure 2 is a partial cross-sectional view showing a closed state of the disconnector of the gas insulated switchgear according to the present invention

3A and 3B are partial cross-sectional views showing a state in which the disconnector of the gas insulated switchgear according to the present invention is opened.

Figure 3c is a partial cross-sectional view showing when the auxiliary contact is separated from the main contact in the open state of the disconnector of the gas insulated switchgear according to the present invention

***** Explanation of symbols for the main parts of the drawing *****

1: movable side 2: fixed side

3: movable side conductor 4: fixed side conductor

6: Fixed contact of movable side conductor 6a: Tension spring of movable side conductor

6b: Shield of movable conductor 7 Fixed contact of fixed conductor

7a: tension spring of fixed side conductor 7b: shield of fixed side conductor

8: auxiliary contact 8a: contact of auxiliary contact

9: coil spring 10: guide

15: movable contact 15a: contact of movable contact

The present invention relates to a circuit breaker having a bus loop current switching capability of a gas insulated switchgear (GIS), and more specifically, when an opening operation is performed with an auxiliary contactor having arc resistance on the fixed side. Gas insulated switchgear that can prevent damage of main contact point by arc and shorten the opening time and arc time of disconnecting device by moving the auxiliary contactor in the opposite direction to the opening direction of main contactor. It is about disconnector of GIS).

In general, a GIS (or gas insulated circuit breaker) is installed on a circuit between a power supply side and a load side of an electrical system to artificially open or close a circuit in a normal current state or on a circuit. An electric device that protects the power system and the load by safely cutting off the current when an accident current such as a ground fault or a short circuit occurs. The disconnecting device of the gas insulated switchgear is a device for opening / closing a charged circuit only below the charged rated voltage of the gas insulated switchgear.

In the disconnector of the gas insulated switchgear (GIS), the bus loop current switching capability is one of the main performances. In the case of a gas insulated switchgear (GIS) having a double bus structure, the first bus and the second bus may be opened and closed at the same time when the bus switching is performed, and the disconnector opens and closes the loop current of the bus. It needs the ability to do it. The present invention is a structure that is applied to the bus bar disconnector having a double bus bar structure.

Then, the bus disconnector of the conventional gas insulation switchgear (GIS) will be described with reference to the accompanying drawings.

1 is a partial cross-sectional view of a disconnector of a gas insulated switchgear according to the prior art.

The disconnecting device of the conventional gas insulated switchgear (GIS) is a movable side conductor 3 of the movable side 1, a fixed side conductor 4 of the fixed side 2, and the movable side conductor, as shown in FIG. The movable contact 5 which opens and closes is provided, moving between the inner diameter of (3) and the inner diameter of the said fixed side conductor 4, and is provided.

The movable side conductor (3) has a fixed contact (6) on one side, a tension spring (6a) for equipping the fixed contact (6) and the contact force required for current conduction between the movable contact (3), and the electric field between the poles In order to make it smooth, the shield 6b which has a smooth curved surface is provided. In addition, the fixed side conductor 4 also has a fixed contact 7 on one side, a tension spring 7a for providing a contact force necessary for conducting current between the fixed contact 7 and the movable contact 3, and between the poles. In order to smooth the electric field, a shield 7b having a smooth curved surface is provided.

In addition, the fixed side conductor 4 is provided with an insulating cap (not shown) which can prevent welding due to arcing and contact between the movable contact 3 and the shield 7b. In addition, the movable contact (3) is connected to the manipulator (not shown), the lever (not shown) and the link (not shown) is composed of a system that is linked by the electric and electric spring of the manipulator or a manual operation force by a person. .

The disconnecting device of the conventional gas insulated switchgear (GIS) has an opening and closing operation by moving the movable contactor 5 connected to the link and the lever in a linear direction according to the rotation of the driving shaft connected to the driving mechanism. Repeat.

The opening and closing operation is performed by opening and closing the movable contact 5 inserted into the fixed side 2 at high speed and low speed by electric, electric spring, or manual force, respectively, according to the purpose of use. In the case of the necessary bus disconnector or the input-capacitance grounding switch, the high speed operation of the movable contactor 5 reduces the arc time to minimize welding and mechanical damage by the arc of the contactor.

In the closing operation, the movable contact 5 is inserted into the fixed side 2 in a linear motion from the movable side 1 to the fixed side 2 as opposed to the opening operation.

The disconnecting device of the conventional gas insulated switchgear (GIS) is a driving mechanism for minimizing damage of the movable contact 5 and the fixed contact 7 of the fixed side conductor 4 due to an arc generated during opening and closing. Increase the speed of) to minimize the arc time.

However, the disconnecting device of the conventional gas insulated switchgear (GIS) having the above constitution, applies a high speed driving mechanism or minimizes the durability of the fixed contact 7 of the fixed side conductor 4 in order to minimize the arc time. Since a large amount of metal is applied for the increase, the size of the disconnector tends to be relatively large due to the application of a dedicated mechanism or a fixed fixed contactor 7 having high durability. This has become one of the major constraints in the construction of compact gas insulation switchgear (GIS).

The present invention is devised to solve the above problems, the object of the present invention is to provide a secondary contactor having an arc resistance on the fixed side to prevent damage to the main contact by the arc during the opening operation, and also assist in opening The present invention provides a disconnector of a gas insulated switchgear (GIS) which can minimize the damage to the contact by moving the contactor in the opposite direction of the main contactor to shorten the open time and arc time of the disconnector.

The disconnecting device of the gas insulated switchgear (GIS) according to the present invention for achieving the above object includes an inner diameter for inserting a movable contactor, and a movable side provided with a fixed contactor, a tension spring, and a shield provided on one outer peripheral surface of the inner diameter. Conductor; An insertion hole for inserting the movable contactor, an auxiliary contactor fixed to a guide and a coil spring to move up and down inside the insertion hole, and having a contact on one side, a fixed contactor and a tension spring provided on an outer circumferential surface of the insertion hole; A fixed side conductor having a shield; And an inner diameter for inserting the auxiliary contactor is formed and a contact is formed on one side, and a contact mechanism between the contact of the auxiliary contactor and the contact is moved by a driving mechanism between the inner diameter of the movable side conductor and the insertion hole of the fixed side conductor. It includes; a movable contact to open and close the operation by the contact.

The disconnecting device of the gas insulated switchgear is closed when the auxiliary contact is inserted into the inner diameter of the movable contact while the contact of the movable contact is inserted into the insertion hole of the fixed side conductor by the driving mechanism. The movable contact is separated from the insertion hole of the fixed side conductor by a driving mechanism, and the contact of the auxiliary contactor is opened when the contact is separated from the inner diameter and contact of the movable contact.

Further, the movable contact pulls the auxiliary contactor toward the movable side conductor while making electrical contact with the contact of the auxiliary contactor when the movable contact is released from the insertion hole of the fixed side conductor, and the auxiliary contactor is connected to the movable contactor. After being moved toward the movable side conductor, the guide and the coil spring are no longer moved, and are separated from the inner diameter of the movable contact, and are then returned to their original state by the restoring force of the coil spring.

Therefore, by providing an auxiliary contactor having an arc resistance on the fixed side to prevent damage to the main contact by the arc during the opening operation, and also during opening the auxiliary contactor moves in the opposite direction to the opening direction of the main contactor, By shortening the arc time, damage to the contact can be minimized.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. In the following description, components having the same functions as in the prior art will be described using the same reference numerals as in the prior art.

2 is a partial cross-sectional view showing a closed state of the disconnector of the gas insulated switchgear according to the present invention.

The disconnecting device of the gas insulated switchgear according to the present invention, as shown in FIG. 2, the movable side conductor 3 of the movable side 1, the fixed side conductor 4 of the fixed side 2, and the movable side conductor 3. And a movable contact 15 for opening and closing operation while moving between the inner diameter of the c) and the insertion hole of the fixed side conductor 4.

Here, the movable side conductor (3) has an inner diameter for inserting the movable contact (15), and a fixed contact (6) in electrical contact with the movable contact (15) on one side of the outer circumferential surface of the inner diameter. And a tension spring 6a for providing a contact force necessary for conducting current between the fixed contact 6 and the movable contact 15, and a shield 6b having a smooth curved surface to smooth the electric field between the poles. have.

The fixed side conductor 4 has an insertion hole for inserting the movable contact 15, and is fixed by the guide 10 and the coil spring 9 so as to move up and down in the insertion hole. And an auxiliary contactor 8 provided with a contact 8a on one side. In addition, the fixed side conductor 4 has a fixed contact 7 which is in electrical contact with the movable contact 15 on the outer circumferential surface of the insertion hole, and a current is supplied between the fixed contact 7 and the movable contact 15. A tension spring 7a for providing the necessary contact force and a shield 7b having a smooth curved surface for smoothing the electric field between the poles are provided.

The movable contact 15 has an inner diameter for inserting the auxiliary contact 8 and a contact 15a for electrical contact with the contact 8a of the auxiliary contact 8 is formed on one side. The movable contact 15 is moved between the inner diameter of the movable side conductor 3 and the insertion hole of the fixed side conductor 4 by a driving mechanism, and the contact 8a of the auxiliary contact 8 and the contact ( Open and close operation by electrical contact with 15a).

The operation of the disconnecting device of the gas insulated switchgear (GIS) according to the present invention having the above structure is such that the movable contactor 15 connected by the link and the lever is linear in accordance with the rotation of the drive shaft connected to the driving mechanism. In the direction of movement and repeat the opening and closing movements.

First, the closing operation is performed as shown in FIG. 2, wherein the movable contact 15 moves linearly from the movable side 1 to the fixed side 2 by a driving mechanism to move the fixed side conductor 4. It is inserted into the insertion hole. At this time, the auxiliary contact 8 is inserted into the inner diameter of the movable contact 15.

Then, the opening operation is reversed to the closing operation, and the movable contact 15 placed on the fixed side 2 is opened at high speed and low speed by electric, electric spring or manual force, respectively, according to the purpose of use. The high speed operation of the movable contactor 15 reduces the arc time in order to minimize the welding and mechanical damage caused by the arc of the contactor.

Hereinafter, with reference to the accompanying drawings will be described in more detail for the operation of the disconnecting device of the gas insulated switchgear according to the present invention.

3A and 3B are partial cross-sectional views showing a state in which the disconnector of the gas insulated switchgear according to the present invention is in open state, and FIG. 3C is a main contactor in the state in which the auxiliary contactor is in the open state of the gas insulated switchgear according to the present invention. A partial cross-sectional view of the breakaway from.

Referring to FIG. 3A, the movable contact 15 starts to move from the fixed side 2 to the movable side 1 by the drive mechanism, and with the fixed contact 7 of the fixed side conductor 4. When the contact 15a of the movable contact 15 is separated, the contact 15a of the movable contact 15 and the contact 8a of the auxiliary contact 8 make electrical contact.

Then, as shown in FIG. 3B, the auxiliary contactor 8 maintains electrical contact between the contact 15a of the movable contactor 15 and the fixed side conductor 4 and maintains the electrical contact of the movable contactor 15. By movement, it moves to the said movable side 1 direction.

Then, as shown in Fig. 3c, the movable contact 15 in the open position moves the auxiliary contact 8 together. At this time, the guide 10 fixed to the auxiliary contact 8 moves in the same direction by the moving distance of the auxiliary contact 8. In addition, the coil spring 9 fixed to the guide 10 and the fixed side conductor 4 is compressed by a moving distance.

When the guide 10 is in contact with the fixed side conductor 4, the auxiliary contactor 8 coupled with the guide 10 no longer moves in a state of being connected with the movable contactor 15. Depart from the inner diameter of the movable contact 15.

The auxiliary contact 8, which is released from the hole of the movable contact 15, moves in the opposite direction to the movable contact 15 by the restoring force of the coil spring 9.

In this way, the improved structure increases the relative speed of the movable contact 15 and the auxiliary contact 8 at the opening point of the disconnector, thereby minimizing arc time and melting loss of the contact.

The present invention is not limited to the embodiments described above, it can be variously modified and changed by those skilled in the art, which should be considered to be included in the spirit and scope of the present invention defined in the appended claims will be.

As described above, according to the inter-pole insulation guide of the disconnecting device and the grounding switch of the gas insulated switchgear (GIS) according to the present invention, the stationary side (1) and the movable side (2) between the movable contact (3) By applying the fixed solid insulation guide (9), it is possible to prevent the movement of the mover by the electromagnetic force during the short-time electric current, and to minimize the increase in the resistance of the circuit after the short-time electric current and the temperature rise due to the rated current. Can be.

In addition, the guide 9 of the solid insulating material having a higher dielectric constant than the insulating gas of SF _{6 in} the section between the movable side 1 and the fixed side 2 improves the insulation performance between the poles and minimizes the distance between the poles. The compact structure can be enabled.

In addition, except for a section in which the movable contactor 3 between the poles is moved, the solid dielectric material 9 is stacked with high dielectric constant so that the movable contactor 3 may be damaged by welding with the shield 4 and the like during opening and closing. By minimizing this, arc performance can be improved.

In addition, the movable contact 3 is moved by the insulation guide 9 at the correct center position, thereby minimizing the load loss when the movable contact 3 is inserted into the fixed contact 5 of the fixed side 2.

In addition, when constructing a disconnector having a loop current switching capability of a gas insulated switchgear (gis) according to the present invention, a dedicated disconnector driving device is not required, and thus standardization of operation devices, cost reduction, and compactness are achieved. In addition, the auxiliary contactor can be expected to improve the contact life, the reliability of the device by minimizing the damage of the main contact of the fixed side by the arc by the arc.

Claims (3)

A movable side conductor having an inner diameter for inserting a movable contactor, a fixed contactor provided on one outer peripheral surface of the inner diameter, a tension spring, and a shield; An insertion hole for inserting the movable contactor, an auxiliary contactor fixed to a guide and a coil spring to move up and down inside the insertion hole, and having a contact on one side, a fixed contactor and a tension spring provided on an outer circumferential surface of the insertion hole; A fixed side conductor having a shield; And An inner diameter for inserting the auxiliary contactor is formed and a contact is formed on one side, and a contact mechanism makes contact between the contact of the auxiliary contactor and the contact while moving between the inner diameter of the movable side conductor and the insertion hole of the fixed side conductor by a driving mechanism. Disconnector of the gas insulated switchgear comprising a; movable contact for opening and closing operation by. The disconnector of claim 1, wherein the disconnector of the gas insulated switchgear is: The contact mechanism of the movable contact is inserted into the insertion hole of the fixed side conductor by the driving mechanism and is closed when the auxiliary contactor is inserted into the inner diameter of the movable contact, The disconnecting device of the gas insulated switchgear characterized in that when the movable contact is separated from the insertion hole of the fixed side conductor by the drive mechanism and the contact of the auxiliary contact is separated from the inner diameter and contact of the movable contact. . The method of claim 2, The movable contact pulls the auxiliary contactor toward the movable side conductor while making electrical contact with the contact of the auxiliary contactor when the movable contact is released from the insertion hole of the fixed side conductor, The auxiliary contactor is driven by the movable contactor to move toward the movable side conductor and is no longer moved by the guide and coil spring but is released from the inner diameter of the movable contactor and then returned to its original state by the restoring force of the coil spring. Disconnector of gas insulated switchgear characterized in that.

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