KR20130120219A - Hybrid-arc-extinction type gas circuit breaker including rotatable moving arc contact in gas insulated switchgear - Google Patents

Abstract

Provided is a hybrid-arc-extinction type gas circuit breaker including a rotatable moving arc contact in a gas insulated switchgear. The hybrid-arc-extinction type gas circuit breaker includes a fixing arc contact in a fixing part, a rotation guider in an operation part, a rotor and a driving load. The operation part is combined with a fixing part. The rotation guider surrounds the rotor and the driving load. The rotor rotates with regard to the driving load.

Description

HYBRID-ARC-EXTINCTION TYPE GAS CIRCUIT BREAKER INCLUDING ROTATABLE MOVING ARC CONTACT IN GAS INSULATED SWITCHGEAR}

Embodiments of the present invention relate to a compound extinguishing type breaker comprising a rotatable arc contact in a gas insulated switchgear.

Recently, a gas insulated switchgear has been manufactured including a compound extinguishing gas circuit breaker. The composite extinguishing gas circuit breaker has a fixed arc contactor, a movable arc contactor, a contact guider, a gas injection chamber and a piston in an atmosphere of low temperature sulfur hexafluoride (SF6) gas. While the gas insulated switchgear is in the state of normal current, the fixed arc contact is in contact with the movable arc contact through a contact guider.

The movable arc contact is in turn surrounded by a contact guider and a gas injection chamber. The gas injection chamber has an expansion chamber and a compression chamber on the movable arc contactor. The expansion chamber and compression chamber communicate with the movable arc contactor and the contact guider. The compression chamber has a piston. While the gas insulated switchgear is converted from the state of the normal current to the state of the fault current, the expansion chamber receives from the contact guider a hot sulfur hexafluoride gas formed using an arc between the fixed arc contact and the movable arc contact.

The high temperature sulfur hexafluoride gas accumulates in the expansion chamber to increase the gas pressure in the expansion chamber. If the gas pressure exceeds a threshold in the expansion chamber, the hot sulfur hexafluoride gas flows back from the expansion chamber toward the contact guider. In this case, the compression chamber has a low temperature compressed sulfur hexafluoride gas using a piston. The cold compressed sulfur hexafluoride gas is forcibly pushed by a piston and flows from the compression chamber to the contact guider.

Through this, the high temperature sulfur hexafluoride gas and the low temperature compressed sulfur hexafluoride gas may flow through the contact guider and injected into the arc between the fixed arc contactor and the movable arc contactor. However, the high temperature sulfur hexafluoride gas and the low temperature compressed sulfur hexafluoride gas do not completely extinguish the arc in a short time, so the flow of large current and / or small current of alternating current between the fixed arc contactor and the movable arc contactor There is a limit to eliminating.

This is because the expansion chamber and the compression chamber have low storage capacity and / or injection capacity of the high temperature sulfur hexafluoride gas and the low temperature compressed sulfur hexafluoride gas due to the miniaturization of the gas insulated switchgear. In addition, the miniaturization of the gas insulated switchgear contributes to reducing the injection speed of the high temperature sulfur hexafluoride gas and the low temperature compressed sulfur hexafluoride gas since the operation performance of the operation device of the complex extinguishing gas circuit breaker is lowered.

In the state of fault current of the gas insulated switchgear, the continuous flow of large current and / or small current of alternating current between the fixed arc contactor and the movable arc contactor deteriorates the alternating current blocking performance of the complex extinguishing type gas circuit breaker. The deterioration of the alternating current blocking performance of the complex extinguishing type gas circuit breaker causes a local temperature rise in the contact guider and / or the expansion chamber due to the diffusion of the high temperature sulfur hexafluoride gas. The local temperature rise of the contact guider and / or expansion chamber promotes the melting of the contact guider and / or expansion chamber over time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a compound extinguishing gas circuit breaker configured to forcibly extinguish an arc between a fixed arc contact and a movable arc contact in a short time in a fault current state of a gas insulated switchgear. .

Other problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned here will be fully understood by those skilled in the art from the following description.

The complex extinguishing type gas circuit breaker according to the embodiments of the present invention may include a rotary guider, a rotor and a driving rod in a fixed arc contact and a movable part coupled to the fixed part in the gas insulated switchgear. The rotary guider may surround the rotor and the drive rod. The rotor may be made of a cylinder to have a movable arc contact on one side and a coupling contact on the other side to face the central axis from the side wall of the cylinder. The movable arc contact may face the fixed arc contact. The coupling contact may be screwed to the rotary guider via a protrusion located on the outer sidewall of the rotor and may be rotationally coupled to the drive rod through a bearing located inside the rotor.

The rotor may be configured to rotate about the central axis of the fixed arc contact.

The rotor may be configured to rotate in response to a linear movement of the drive rod.

The combined extinguishing gas blocker further includes a nozzle and a cylinder that surround the rotor in sequence. The nozzle may protrude toward the fixed arc contact while surrounding the movable arc contact. The cylinder may protrude from the nozzle to define at least one chamber on the rotor and include a piston in the at least one chamber. The piston may surround the rotor. The rotary guider may be positioned between the piston and the rotor to be fixed to the piston.

The drive rod may be configured to make a linear movement with respect to the piston, and the rotor, the nozzle and the cylinder may be configured to rotate with respect to the piston and the drive rod.

Alternatively, the nozzle, the cylinder and the drive rod may be configured to make a linear movement with respect to the piston, and the rotor to make a rotational movement with respect to the piston and the drive rod.

In the state where the gas insulated switchgear is in the normal current state, the movable arc contact is configured to contact the fixed arc contact through the rotational movement of the rotor, the nozzle, the cylinder and the linear movement of the drive rod with respect to the piston. Can be.

The movable arc contact is configured to be separated from the fixed arc contact through the rotational movement of the rotor, the nozzle, the cylinder and the linear movement of the drive rod with respect to the piston while the gas insulated switchgear is in a fault current state. Can be.

As described above, in the state of the fault current of the gas insulated switchgear,

The composite extinguishing gas circuit breaker according to the embodiments of the present invention may rotate the rotor in the movable part to reduce the arc thickness by varying the generation length of the arc located between the fixed arc contact and the movable arc contact over time. .

The complex extinguishing gas circuit breaker rotates the rotor in the movable part to concentrate the arc between the peaks of the fixed arc contact and the movable arc contact by varying the generation direction of the arc located between the fixed arc contact and the movable arc contact over time. You can.

The complex extinguishing gas circuit breaker reduces the arc thickness between the fixed arc contact and the movable arc contact by the rotation of the rotor in the movable portion, and concentrates the arc between the peaks of the fixed arc contact and the movable arc contact, thereby providing an arc within a short time. Can be forcibly destroyed.

The complex extinguishing type gas circuit breaker forcibly extinguishes the arc between the fixed arc contact and the movable arc contact in a short time due to the rotation of the rotor in the movable portion, thereby allowing a local temperature in the nozzle and / or expansion chamber through the hot sulfur hexafluoride gas. The rise can be prevented.

The complex extinguishing type gas circuit breaker forcibly extinguishes the arc between the fixed arc contact and the movable arc contact in a short time due to the rotation of the rotor in the movable part, thereby preventing the nozzle and / or expansion chamber from being swept through the high temperature sulfur hexafluoride gas. can do.

The complex extinguishing type gas circuit breaker may increase the design margin for the driving unit which may continuously lower the operating performance of the driving unit to correspond to the miniaturization of the gas insulated switchgear by rotating the rotor in the movable unit.

1 is a cross-sectional view showing a complex extinguishing type gas circuit breaker in a gas insulated switchgear according to embodiments of the present invention.
FIG. 2 is an enlarged view illustrating a coupling relationship between a coupling contact of a rotor, a rotation guider, and a driving rod in region 'A' of FIG. 1.
3 to 6 are cross-sectional views illustrating the operation of the complex extinguishing type gas circuit breaker in the gas insulated switchgear according to the embodiments of the present invention.

First, a complex extinguishing type breaker including a rotatable arc contact in a gas insulated switchgear will be described in more detail with reference to FIGS. 1 and 2.

1 is a cross-sectional view showing a complex extinguishing type gas circuit breaker in a gas insulated switchgear according to embodiments of the present invention. In this case, Fig. 1 shows a compound extinguishing gas circuit breaker in the state of the steady current of the gas insulated switchgear.

Referring to FIG. 1, a composite extinguishing gas circuit breaker 60 according to embodiments of the present invention includes a fixed portion 10 and a movable portion 50. The fixing part 10 includes an insulating member 3, a first connecting member 6, and a fixed arc contact 9. The insulating member 3 surrounds the first connecting member 6 and the fixed arc contact 9. The first connecting member 6 is located inside the insulating member 3 and fixed to the insulating member 3.

The fixed arc contact 9 is fixed to one side of the insulating member 3 and extends in the longitudinal direction of the insulating member 3 or toward the movable part 50. The movable part 50 is inserted into the fixed part 10 and coupled to the fixed part 10. The movable part 50 includes a rotor 22, a nozzle 26, and a cylinder 29. The rotor 22 and the nozzle 26 are partially inserted into the fixing part 10 and protrude from the fixing part 10.

The rotor 22 may be made of a cylinder. The rotor 22 has a movable arc contact 21 on one side and a coupling contact 23 on the other side so as to face the central axis from the side wall of the cylinder. The movable arc contact 21 contacts the fixed arc contact 9 through the nozzle 26 so as to face the fixed arc contact 9. In this case, the fixed arc contact 9 is fitted to the movable arc contact 21.

The nozzle 26 partially surrounds the fixed arc contact 9 and the movable arc contact 21. Thus, the rotor 22 protrudes from the nozzle 26. The nozzle 26 has a fluid path therein. The cylinder 29 extends along the rotor 22, partially surrounding the nozzle 26 around the insulating member 3. In this case, the rotor 22, nozzle 26 and cylinder 29 define an expansion chamber 32, and the rotor 22 and cylinder 29 define a compression chamber 36. do.

The expansion chamber 32 and the compression chamber 36 are located on the movable arc contact 23. The expansion chamber 32 and the compression chamber 36 communicate with one another via a connection hole 34. The expansion chamber 32 and the compression chamber 36 communicate with the flow path of the nozzle 26. The compression chamber 36 has a piston 38 therein. The piston 38 moves left and right horizontally in the compression chamber 36.

The piston 38 surrounds the rotor 22. On the other hand, the complex extinguishing gas circuit breaker 60 further includes a rotary guider 43 and a driving rod 49 in the movable part 50. The rotary guider 43 is positioned between the rotor 22 and the piston 38 and fixed to the piston 38. The rotary guider 43 surrounds the rotor 22 and the drive rod 49 which are positioned horizontally in sequence.

In this case, the coupling contact 23 is coupled to the plurality of grooves 43a of the rotary guider 43. The coupling contact 23 is coupled to the drive rod 49 through a bearing 46 located inside the rotor 22. The rotor 22, nozzle 26, cylinder 29, and drive rod 49 may move relative to the piston 38 or rotary guider 43.

The coupling relationship between the rotor 22, the rotary guider 43, and the driving rod 49 will be described in more detail with reference to FIG. 2.

FIG. 2 is an enlarged view illustrating a coupling relationship between a coupling contact of a rotor, a rotation guider, and a driving rod in region 'A' of FIG. 1.

2, the coupling contact 23 has a protrusion 23a. The protrusion 23a is formed along the outer sidewall of the rotor 22. The rotary guider 43 includes a plurality of grooves 43a and through holes 43b therein. The plurality of grooves 43a may be disposed along the through hole 43b to form one spiral groove in the rotary guider 43.

The through hole 43b may induce the movement of the rotor 22 and the driving rod 49 in a predetermined direction. In this case, the rotor 22 is located in the through hole 43b together with the drive rod 49. The protrusion 23a of the coupling contact 23 may be located in the grooves 43a of the rotary guider 43. That is, the coupling contact 23 is screwed to the rotary guider 43 through the protrusion 23a located on the outer sidewall of the rotor 22.

The rotor 22 also has a bearing 46 therein. The bearing 46 is surrounded by the coupling contact 23 and fixed to the second connecting member 49a of the drive rod 49. Thus, the coupling contact 23 is rotationally coupled to the drive rod 49 through a bearing 46 located inside the rotor 22. When the drive rod 49 makes a linear motion in the first direction D1 or the second direction D2, the rotor 22 is a piston 38, a rotary guider 43, and / or a drive. The rod 49 can be rotated in the third direction D3.

3 to 6 are cross-sectional views illustrating the operation of the complex extinguishing type gas circuit breaker in the gas insulated switchgear according to the embodiments of the present invention. In this case, Fig. 3 shows the operation of the compound extinguishing type gas circuit breaker in the state of the steady current of the gas insulated switchgear.

4 to 6 show the operation of the compound extinguishing type gas circuit breaker in the state of the fault current of the gas insulated switchgear. FIG. 5 is an enlarged view showing the length and thickness of generation of the arc in the nozzle with time in region 'B' of FIG. 4.

Referring to FIG. 3, the complex extinguishing gas circuit breaker 60 has a fixing part 10 and a piston 38 fixed to a gas insulated switchgear. The combined extinguishing gas circuit breaker 60 comprises a rotor 22, a nozzle 26, a cylinder 29 and a horizontally moving left and right relative to the fixed arc contact 9 and / or the piston 38. It further has a drive node 49. In this case, the rotor 22, nozzle 26 and cylinder 29 are fixed relative to each other.

The rotor 22 may be separate from the nozzle 26 and the cylinder 29. The rotor 22 has a movable arc contact 21 on one side and a coupling contact 23 on the other side. The cylinder 29 has an expansion chamber 32 and a compression chamber 36 on the movable arc contact 23. The compression chamber 36 has a piston 38 therein. The piston 38 has a rotary guider 43 therein.

The rotary guider 43 is fixed to the piston 38. The rotary guider 43 is screwed with the coupling contact 23 of the rotor 22 through a plurality of grooves (43a). The coupling contact 23 is rotatably coupled with the driving rod 49 through a bearing 46 positioned inside the rotor 22. The driving rod 49 may be manipulated through a driving unit (not shown).

On the other hand, in the state of the normal current of the gas insulated switchgear, the rotor 22, the nozzle 26 and the cylinder 29 move in a left direction relative to the piston 38 to the first direction (D1) You can move along. In this case, the movable arc contact 21 is fixed to the piston 38 through the rotational movement and / or the linear movement of the rotor 22, the nozzle 26, the cylinder 29 or the drive rod 49. In contact with the arc contact (9).

The fixed arc contact 9 is in contact with the movable arc contact 21 through the nozzle 26. The fixed arc contact 9 and the movable arc contact 21 may allow a large current of alternating current to flow through the complex extinguishing gas circuit breaker 60. In addition, the compression chamber 36 may have a greater gas storage capacity compared to FIGS. 4 or 6 due to the movement of the cylinder 29. The compression chamber 36 may be filled with a low temperature sulfur hexafluoride (SF6) gas.

Referring to FIG. 4, in the state of fault current of the gas insulated switchgear, the rotor 22, the nozzle 26, the cylinder 29, and the driving rod 49 are relatively right with respect to the piston 38. Can move along the second direction D2. In this case, the drive node 49 may linearly move in the second direction D2 with respect to the piston 38 and / or the rotary guider 43.

The rotor 22, the nozzle 26, and the cylinder 29 may rotate in the third direction D3 with respect to the piston 38 and the driving rod 49. Alternatively, the nozzle 26, the cylinder 29, and the drive rod 49 make linear movements in the second direction D2 with respect to the piston 38, and the rotor 22 has a piston 38 and A rotational movement can be made with respect to the drive rod 49 in the third direction D3.

Through this, the rotor 22 may rotate around the central axis C of the fixed arc contact. The movable arc contact 21 is separated from the fixed arc contact 9. The fixed arc contact 9 and the movable arc contact 23 generate the first arc 62a in the nozzle 26 using a large current of alternating current. The first arc 62a is generated between the fixed arc contact 9 and the movable arc contact 21.

The first arc 62a may rotate in the fourth direction D4 between the fixed arc contact 9 and the movable arc contact 21 in response to the rotational movement of the rotor 22. The rotational motion of the first arc 62a will be described in more detail with reference to FIG. 5. The first arc 62a may generate a high temperature sulfur hexafluoride gas by heating a low temperature sulfur hexafluoride gas using thermal energy.

The high temperature sulfur hexafluoride gas may move along the flow line 64 diffused from the high temperature nozzle 26 toward the low temperature expansion chamber 32. Meanwhile, the low temperature sulfur hexafluoride gas of the compression chamber 36 may be compressed by the piston 38 due to the movement of the cylinder 29.

Referring to FIG. 5, in the state of a fault current of the gas insulated switchgear, while the rotor 22 is rotated in the third direction D3, the first arc 62a is fixed arc contact 9. And the movable arc contact 21 are rotated in the fourth direction D4. In this case, the first arc 62a is converted to the second arc 62b because it rotates in the fourth direction D4.

The second arc 62b is formed between the fixed arc contact 9 and the movable arc contact 21 by varying the production length and thickness with respect to the first arc 62a over time. This is because the first arc 62a is formed along the flow of a large current of alternating current between the curved surface in the end of the fixed arc contact 9 and the contact surface of the movable arc contact 21, but the second arc 62b Is formed by moving along the fifth direction D5 toward the peaks of the fixed arc contact 9 and the movable arc contact 21 having the greatest intensity of static electricity per unit area due to the rotational movement of the rotor 22. Because it becomes.

In this case, since the magnitude of the large current is the same for the first arc 62a and the second arc 62b, the second arc 62b is between the fixed arc contact 9 and the movable arc contact 21. The generation length and thickness may be different from that of the first arc 62a in correspondence with the distance of. That is, the generation length of the second arc 62b is larger than the generation length of the first arc 62a, and the thickness of the second arc 62b is smaller than the thickness of the first arc 62a.

Referring to FIG. 6, when the high temperature sulfur hexafluoride gas has a gas pressure greater than a threshold in the expansion chamber 32, the high temperature sulfur hexafluoride gas is directed from the expansion chamber 32 toward the nozzle 26. It can be moved along the spreading flow line 66. Thus, the hot sulfur hexafluoride gas can diffuse from the expansion chamber 32 toward the nozzle 23. Subsequently, the high temperature sulfur hexafluoride gas is injected between the fixed arc contact 9 and the movable arc contact 21.

The hot sulfur hexafluoride gas is injected into the second arc 62b of FIG. 5 to produce a broken arc 68 between the fixed arc contact 9 and the movable arc contact 23 within a short time. This is because the second arc 62b has a smaller thickness than the first arc 62a of FIG. 5. The broken arc 68 can prevent the flow of large currents of alternating current between the fixed arc contact 9 and the movable arc contact 23.

In addition, the piston 38 injects low temperature compressed sulfur hexafluoride gas in the compression chamber 36 from the compression chamber 36 toward the nozzle 26. The cold compressed sulfur hexafluoride gas, although not shown in FIG. 6, can completely extinguish the broken arc 68 through the nozzle 26. In this case, the low temperature compressed sulfur hexafluoride gas can prevent the flow of a small current of alternating current between the fixed arc contact 9 and the movable arc contact 23.

In this case, since the second arc 62b is broken in a short time by using the high temperature sulfur hexafluoride gas and the low temperature compressed sulfur hexafluoride gas, the driving portion of FIG. 3 corresponds to the miniaturization of the gas insulated switchgear. Therefore, it can be designed to a smaller size than the prior art.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

3; Insulation member 6; First connecting member
9; Fixed arc contacts, 10; [0035]
21; Movable arc contact, 22; Rotor
23; Coupling contact, 23a; projection part
26; Nozzle, 29; cylinder
32; Expansion chamber, 34; Connection hall,
36; Compression chamber. 38; piston
43; Rotary guider, 43a; home
43b; Through hole, 46; bearing
49; Drive rod, 49a; Second connecting member
50; Moving part 60; Compound lo-type gas circuit breaker
62a, 62b, 68; Arcs, 64, 66; Streamlines
A, B; Magnification regions C; Central Axis,
D1, D2, D3, D4, D5; First to fifth directions.

Claims (8)

In gas insulated switchgear,
A fixed arc contact in the fixture; And
Including a rotary guider, a rotor and a driving rod in the movable portion coupled to the fixed portion,
The rotary guider surrounds the rotor and the drive rod,
The rotor consists of a cylinder and has a movable arc contact on one side and a coupling contact on the other side to face the central axis from the side wall of the cylinder,
The movable arc contact faces the fixed arc contact, and
And the coupling contact is screwed to the rotary guider via a protrusion located on the outer sidewall of the rotor and rotationally coupled to the drive rod through a bearing located inside the rotor. The method of claim 1,
And the rotor is configured to rotate about a central axis of the fixed arc contact. The method of claim 1,
And said rotor is configured to rotate in response to a linear movement of said drive rod. The method of claim 1,
Further comprising a nozzle and a cylinder for sequentially surrounding the rotor,
The nozzle protrudes toward the fixed arc contact while surrounding the movable arc contact,
The cylinder protrudes from the nozzle to define at least one chamber on the rotor and includes a piston in the at least one chamber,
The piston surrounds the rotor, and
And the rotary guider is positioned between the piston and the rotor to be fixed to the piston. 5. The method of claim 4,
The drive rod makes a linear movement with respect to the piston, and
And said rotor, said nozzle and said cylinder are configured to rotate with respect to said piston and said drive rod. 5. The method of claim 4,
The nozzle, the cylinder and the driving rod make a linear motion with respect to the piston, and
And the rotor is configured to make rotational movement with respect to the piston and the drive rod. 5. The method of claim 4,
In the state where the gas insulated switchgear is a normal current,
And the movable arc contact is configured to contact the fixed arc contact with the rotor, the nozzle, the rotary motion of the cylinder and the linear motion of the drive rod relative to the piston. 5. The method of claim 4,
In the state of the gas insulated switchgear failure current,
And the movable arc contact is configured to be separated from the fixed arc contact with the rotor, the nozzle, the rotary motion of the cylinder and the linear motion of the drive rod with respect to the piston.

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