Nozzle device of gas-insulated circuit breaker

Abstract

The present invention relates to a nozzle device of a gas-insulated circuit breaker, capable of improving the blocking performance of a gas-insulated circuit breaker by reinforcing the performance of relaxing an electric field of a fixed-side arcing contact during a blocking operation, the nozzle device of a gas-insulated circuit breaker, according to one embodiment, having a movable-side arcing contact and a fixed-side arcing contact which are disposed so as to face each other. The nozzle device may comprise: a main nozzle provided to a movable part so as to surround the movable-side arcing contact; and a shield movably provided to the main nozzle.

Description

Nozzle device of gas-insulated circuit breaker

[0001] The present invention relates to a nozzle device of a gas-insulated circuit breaker that can improve the breaking performance of the gas-insulated circuit breaker by reinforcing the performance of alleviating the electric field of a fixed-side arc contact during a breaking operation.

[0002] A gas-insulated circuit breaker (GAC) is a device that switches or interrupts current in transmission, substation, or electrical circuits when a load is switched or grounded or a short circuit occurs. These GCCs include an insulated support installed within a tank, and fixed and movable parts, each supported by the insulated support and equipped with a main contact and an arc contact. The tank is filled with insulating gas and sealed.

[0003] Here, when an abnormal current is applied, the arc contacts of the fixed and movable parts are separated from each other as the movable part moves, and an arc is generated at the contact point. In addition, the insulating gas inside the cylinder of the movable part is compressed and emitted as an arc between the poles, extinguishing the arc and blocking the abnormal current.

[0004] The movable part is provided with a nozzle and a shield that is fixedly connected to the outer surface of the nozzle and that mitigates the electric field generated at the tip when the fixed part and the movable part are connected or disconnected. In this way, the gas-insulated circuit breaker can improve its blocking performance by applying a shield to the nozzle to improve the electric field.

[0005] When an abnormal current occurs in a system or electrical circuit and a gas-insulated circuit breaker attempts to trip, the shield and the fixed-side arc contacts may be positioned perpendicular to each other or closer to the movable-side arc contacts, increasing the electric field between the poles. This increases the probability of tripping failure in the gas-insulated circuit breaker.

[0006] The purpose of the present invention is to provide a nozzle device for a gas-insulated circuit breaker that can improve the breaking performance of the gas-insulated circuit breaker by reinforcing the performance of alleviating the electric field of a fixed-side arc contact during a breaking operation.

[0007] A nozzle device of a gas-insulated circuit breaker according to one embodiment of the present invention is a nozzle device of a gas-insulated circuit breaker having a movable-side arc contact and a fixed-side arc contact that are arranged to face each other, wherein the nozzle device may include: a main nozzle installed on a movable part to surround the movable-side arc contact; and a shield movably installed on the main nozzle.

[0008] The above main nozzle may include a support formed as a baffle so that one end thereof is fixedly connected to the cylinder of the movable part and the other end thereof extends radially outward to support the shield.

[0009] The above support includes a plurality of ventilation holes, and the plurality of ventilation holes can be arranged at a constant interval from each other.

[0010] The above ventilation hole may have a circular, oval, or arc-shaped cross-sectional shape.

[0011] The shield comprises a main body formed to surround the outer circumferential surface of the main nozzle; and a flange extending circumferentially and radially from one end of the main body, the flange having a shape and area capable of shielding the ventilation hole, and a plurality of mounting holes may be formed in the flange at regular intervals from each other.

[0012] The shield may further include a plurality of support rods installed upright on the support around the ventilation hole, penetrating the mounting hole and having stoppers formed at the ends; and a spring fitted to the support rods and interposed between the flange and the stopper.

[0013] The above flange can move along the support rod by overcoming the elastic force of the spring due to the pressure difference of the gas in the axial space on both sides divided based on the support, and when the pressure difference of the gas is released, it can return to its original position by the elastic force of the spring.

[0014] The above shield can be made of a metal material having a certain strength along with conductivity.

[0015] The above shield can be positioned between the main nozzle and the fixed side main contact.

[0016] The above nozzle device further includes an auxiliary nozzle disposed between the movable side arc contact and the main nozzle and spaced apart from the main nozzle, and a channel and a nozzle neck can be formed between the main nozzle and the auxiliary nozzle.

[0017] According to an embodiment of the present invention, since the shield applied to the main nozzle is configured to be movable, the electric field value at the tip of the fixed-side arc contact can be lowered, and accordingly, the transient recovery voltage after the blocking operation can be withstood, thereby obtaining the effect of improving the blocking performance of the gas-insulated circuit breaker.

[0018] FIG. 1 is a cross-sectional view illustrating a nozzle device of a gas-insulated circuit breaker according to one embodiment of the present invention.

[0019] Figure 2 is a perspective view illustrating the shield of Figure 1.

[0020] Figure 3 is a drawing of the main nozzle support viewed from one side, with the shield omitted.

[0021] Fig. 4 is a cross-sectional view showing the operating state of a nozzle device of a gas-insulated circuit breaker according to one embodiment of the present invention.

[0022] Hereinafter, the present invention will be described in detail with reference to exemplary drawings. When designating components in each drawing, it should be noted that, where possible, identical components are given the same reference numerals, even if they appear in different drawings.

[0023] Fig. 1 is a cross-sectional view illustrating a nozzle device of a gas-insulated circuit breaker according to one embodiment of the present invention. Fig. 2 is a perspective view illustrating the shield of Fig. 1, and Fig. 3 is a side view of the support of the main nozzle with the shield omitted.

[0024] First, the gas-insulated circuit breaker may include a fixed part (10) and a movable part (20).

[0025] The fixed part (10) may include a fixed-side arc contact (11) and a fixed-side main contact (12). The fixed-side main contact may be formed and arranged in a form that surrounds and is spaced apart from the fixed-side arc contact.

[0026] The movable part (20) may include a movable side arc contact (21), a movable side main contact (22), a cylinder (23), and a nozzle device (30). The movable part may move in the axial direction of the movable part (left-right direction in Fig. 1) by a driving part (not shown) connected via a movable rod (24).

[0027] The movable side arc contact (21) can be formed and arranged to accommodate the fixed side arc contact (11) and to be in contact with each other. When the gas-insulated circuit breaker is opened or closed, the movable side arc contact separates from or comes into contact with the fixed side arc contact, and an arc is generated between the poles of these arc contacts. Since the movable side arc contact may be worn by the generated arc, it can be made of a material that is resistant to arc.

[0028] The movable side main contact (22) can be coupled to the radially outer side of the main nozzle (31) constituting the nozzle device (30). The outer surface of the movable side main contact can be in contact with the inner surface of the fixed side main contact (12).

[0029] The movable side main contact (22) and the fixed side main contact (12) are in contact with each other when the system or electric circuit is in a normal state to electrically connect the circuit, and are separated from each other in an abnormal state (e.g., application of overcurrent, etc.) to cut off the circuit.

[0030] The cylinder (23) can be connected to one side of the movable side arc contact (21), the main nozzle (31) of the nozzle device (30), and the movable side main contact (22), and can support these components. For example, the cylinder can be fixed to the movable rod (24) while surrounding the movable rod, and can define a chamber (25) between the cylinder and the movable rod.

[0031] In this way, the movable side arc contact (21), the movable side main contact (22), the cylinder (23), and the nozzle device (30) constituting the movable part (20) can be moved according to the operation of the driving part via the movable rod (24).

[0032] Meanwhile, the fixed-side arc contact (11) and / or the fixed-side main contact (12) may be fixed so that their positions do not change, but are not necessarily limited thereto. For example, the fixed-side arc contact and / or the fixed-side main contact may be configured to be movable. In this case, the movable-side contact may constitute a driving-side contact, and the fixed-side contact may constitute a driven-side contact. In this specification, it is only disclosed that at least the movable-side arc contact (21) is relatively movable with respect to the fixed-side arc contact (11).

[0033] The interior of the cylinder (23), i.e., the chamber (25), is filled with a gas such as an insulating gas, and a through hole (26) may be formed in one axial side wall of the cylinder. When the movable part (20) moves relative to the fixed part (10), the cylinder can extinguish the arc by injecting insulating gas into the space between the movable side arc contact (21) and the main nozzle (31).

[0034] A nozzle device (30) of a gas-insulated circuit breaker according to one embodiment of the present invention may include a main nozzle (31) that is installed in a movable part (20) so as to surround a movable-side arc contact (21) and communicate with a through hole (26) of a cylinder (23), and moves together with the movable part; and a shield (40) that is arranged adjacent to a fixed-side arc contact (11) in the main nozzle and is movably installed.

[0035] In addition, the nozzle device (30) may further include an auxiliary nozzle (32) disposed between the movable side arc contact (21) and the main nozzle (31) and spaced apart from the main nozzle at a predetermined distance.

[0036] Here, the main nozzle (31) and the auxiliary nozzle (32) can be made of an insulating material such as polytetrafluoroethylene.

[0037] One end of the main nozzle (31) may be fixedly connected to the side wall of the cylinder (23), and one end of the auxiliary nozzle (32) may be fixedly connected to the side wall of the cylinder (23) or the end of the movable rod (24). A channel (33) and a nozzle neck (34) may be formed between the main nozzle and the auxiliary nozzle.

[0038] Accordingly, a gas path can be formed from the chamber (25) within the cylinder (23) to the through hole (26), the channel (33), and the arc area within the nozzle device (30). That is, the channel forms a path through which high-temperature gas generated by the arc between the poles flows into the chamber, and also forms a path through which gas cooled within the chamber is sprayed from the chamber to the pole.

[0039] The nozzle neck (34) is where the gas flowing out through the channel (33) is finally ejected from the nozzle device (30).

[0040] The other end of the main nozzle (31) may be provided with a support (35) formed to extend radially outward and support a shield (40). The support may be formed in the form of an annular bulkhead having a predetermined thickness and may be formed or combined integrally with the main nozzle.

[0041] The support (35) may be formed with a plurality of ventilation holes (36) to allow gas to flow into the axially spaced spaces (S1, S2) defined based on the support. The ventilation holes may have, for example, a circular or oval cross-sectional shape, or an approximately arc-shaped cross-section extending along the circumference of the support. The plurality of ventilation holes may be arranged at regular intervals from each other.

[0042] The shield (40) may include a main body (41) formed to surround the outer surface of the main nozzle (31), and a flange (42) extending circumferentially and radially from one end of the main body. A plurality of mounting holes (44) formed at regular intervals from each other may be provided in the flange.

[0043] Additionally, the shield (40) may include an extension (43) that is thickened by being bent radially outward from the axial direction at the other end of the main body (41).

[0044] The shield (40) can be made of a metal material having a certain strength and conductivity, such as aluminum or an aluminum alloy. This shield is positioned between the fixed-side main contact (12) and the main nozzle (31), and can alleviate the electric field generated at the tip of the fixed-side arc contact (11) when connecting or disconnecting between the fixed part (10) and the movable part (20).

[0045] The shield (40) may further include a plurality of support rods (45) that are installed approximately upright on a support (35) around a ventilation hole (36), penetrate the mounting hole (44) of the flange (42), and have stoppers (46) formed at the ends; and a spring (47) that is fitted to the support rods and interposed between the flange and the stopper.

[0046] A plurality of support rods (45) can be spaced apart from each other at the same interval as the plurality of mounting holes (44) in the flange (42) of the shield (40). A stopper (46) having a larger area than the corresponding mounting hole can be formed at the end of the support rod to limit movement of the flange, i.e., the shield. After the flange and spring (47) are assembled to the support rod, the support rod can be fixed to the support member (35) by screwing, gluing, or joining.

[0047] The flange (42) can be formed in a shape that can shield the ventilation hole (36) of the support (35) and has a larger area than the ventilation hole.

[0048] The spring (47) is a member for moving and returning the shield (40), and a coil spring may be employed, but is not necessarily limited thereto. One end of the spring is fixed to the flange (42), and the other end is fixed to the stopper (46) of the support rod (45), so that the spring can provide a force to separate the flange and the stopper from each other. As a result, the spring can push the flange of the shield toward the support (35).

[0049] The flange (42) of the shield (40) can move along the support rod (45) by overcoming the elastic force of the spring (57) due to the pressure difference of the gas in the axial space (S1, S2) on both sides divided based on the support (35), and when the pressure difference of the gas is released, it moves along the support rod by the elastic force of the spring and returns to the original position.

[0050] Fig. 4 is a cross-sectional view showing the operating state of a nozzle device of a gas-insulated circuit breaker according to one embodiment of the present invention.

[0051] As described above, in the normal state of the system or electric circuit, the pressure of the gas in the axial space (S1, S2) divided based on the support (35) of the main nozzle (31) is the same, so there is no relative movement of the shield (40) with respect to the main nozzle.

[0052] Accordingly, the flange (42) of the shield (40) can be maintained in contact with one side of the support (35) while closing the ventilation hole (36) by the elastic force of the spring (47).

[0053] For example, when an abnormal current occurs in a system or electric circuit and a gas-insulated circuit breaker attempts to trip, the movable side arc contact (21) separates from the fixed side arc contact (11), causing an arc to occur between the poles of these arc contacts.

[0054] Due to such an arc, the pressure of the gas within the fixed part (10) and the movable part (20) can increase. In particular, as the pressure of the gas within the space (S2) divided by the main nozzle (31) and the fixed-side main contact (12) increases significantly, a difference occurs in the pressure of the gas within the space (S1) on the opposite side based on the support of the main nozzle.

[0055] Due to the pressure difference of the gas, the flange (42) of the shield (40) can overcome the elastic force of the spring (47) and move along the support rod (45), and at this time, the ventilation hole (36) can be opened. Accordingly, the shield moves relative to the main nozzle (31) and moves toward the movable side arc contact (21).

[0056] As described above, according to an embodiment of the present invention, since the shield applied to the main nozzle is configured to be movable according to pressure, the shield can be displaced to a position where the electric field value at the tip of the fixed-side arc contact can be lowered, thereby enhancing the performance of alleviating the electric field of the shield. Accordingly, the gas-insulated circuit breaker has improved insulation performance capable of withstanding the transient recovery voltage (TRV) after the breaking operation, and ultimately, the breaking performance of the gas-insulated circuit breaker can be improved.

[0057] The above description is merely an example of the technical idea of ​​the present invention, and those skilled in the art will appreciate that various modifications and variations can be made without departing from the essential characteristics of the present invention.

[0058] Accordingly, the embodiments disclosed in the present invention are intended to illustrate, rather than limit, the technical concepts of the present invention, and the scope of the technical concepts of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical concepts within the scope equivalent thereto should be construed as being included within the scope of the present invention.

[0059] The present invention is useful for safely protecting a power system or electric circuit by safely blocking an accident current.

Claims

1. A nozzle device of a gas-insulated circuit breaker having a movable side arc contact and a fixed side arc contact arranged opposite to each other, The above nozzle device, A main nozzle installed on the movable part to surround the above movable side arc contact; and A shield movably installed on the main nozzle above Nozzle device of a gas-insulated circuit breaker including a .

2. In paragraph 1, The above main nozzle is a nozzle device of a gas-insulated circuit breaker including a support formed as a partition wall so as to support the shield by extending radially outward from one end thereof and being fixedly connected to the cylinder of the movable part.

3. In paragraph 2, The above support includes a plurality of ventilation holes, A nozzle device of a gas-insulated circuit breaker in which a plurality of the above-mentioned ventilation holes are arranged at regular intervals from each other.

4. In paragraph 3, The above ventilation hole is a nozzle device of a gas-insulated circuit breaker having a circular, oval, or arc-shaped cross-sectional shape.

5. In paragraph 3, The above shield, A body formed to surround the outer surface of the main nozzle; and A flange extending circumferentially and radially from one end of the above body Including, The above flange has a shape and area capable of shielding the above ventilation hole, A nozzle device of a gas-insulated circuit breaker having a plurality of mounting holes formed at regular intervals on the above flange.

6. In paragraph 5, The above shield, A plurality of support rods installed upright on the support around the ventilation hole and penetrating the mounting hole, and having stoppers formed at the ends; and A spring fitted to the above support rod and interposed between the above flange and the above stopper A nozzle device of a gas-insulated circuit breaker including:

7. In paragraph 6, The above flange is a nozzle device of a gas-insulated circuit breaker that moves along the support rod by overcoming the elastic force of the spring due to the pressure difference of the gas in the axial space on both sides divided based on the support, and returns to the original position by the elastic force of the spring when the pressure difference of the gas is released.

8. In paragraph 5, The above shield is a nozzle device of a gas-insulated circuit breaker made of a metal material having a certain strength and conductivity.

9. In paragraph 5, The above shield is a nozzle device of a gas-insulated circuit breaker located between the main nozzle and the fixed-side main contact.

10. In any one of paragraphs 1 to 9, The above nozzle device further includes an auxiliary nozzle disposed between the movable side arc contact and the main nozzle and spaced apart from the main nozzle, A nozzle device of a gas-insulated circuit breaker having a channel and nozzle neck formed between the main nozzle and the auxiliary nozzle.

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