KR101860101B1 - Hybrid-arc-extinction type gas circuit breaker including rotatable moving arc contact in gas insulated switchgear - Google Patents

Abstract

There is provided a composite SOH type circuit breaker including a movable movable arc contact rotatable in a gas insulated switchgear. The composite arc type circuit breaker may include a fixed arc contact in the fixed portion, and a rotating guider, a rotor, and a driving rod in the movable portion. The movable portion may be coupled to the fixed portion. The rotary guider may surround the rotor and the drive rod. The rotor can be rotated with respect to the driving rod.

Description

HYBRID-ARC-EXTINCTION TYPE GAS CIRCUIT BREAKER INCLUDING ROTATABLE MOVING ARC CONTACT IN GAS INSULATED SWITCHGEAR <br> <br> <br> Patents - stay tuned to the technology HYBRID-ARC-EXTINCTION TYPE GAS CIRCUIT BREAKER INCLUDING ROTATABLE MOVING ARC CONTACT IN GAS INSULATED SWITCHGEAR

Embodiments of the present invention relate to a composite SOH type circuit breaker including a movable movable arc contact rotatable in a gas insulated switchgear.

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

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

The high-temperature sulfur hexafluoride gas accumulates in the expansion chamber to increase the gas pressure in the expansion chamber. When the gas pressure exceeds a threshold value in the expansion chamber, the high-temperature sulfur hexafluoride gas flows again from the expansion chamber toward the contact guider. In this case, the compression chamber has a compressed compressed sulfur hexafluoride gas using a piston. The low-temperature compressed sulfur hexafluoride gas is forcibly pushed by the 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 can flow through the contact guider and be injected into the arc between the fixed arc contactor and the movable arc contactor. However, since the high-temperature sulfur hexafluoride gas and the low-temperature compressed sulfur hexafluoride gas can not completely extinguish the arc in a short time, the flow of a large current and / or a small current of alternating current between the fixed arc contactor and the movable arc contactor It has limitations in eliminating it.

This is because the expansion chamber and the compression chamber have a small storage capacity and / or a low 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 downsizing of the gas-insulated switchgear contributes to lowering the injection speed of the high-temperature sulfur hexafluoride gas and the low-temperature compressed sulfur hexafluoride gas because the operating performance of the operating device of the composite SOF type gas circuit breaker is lowered.

In the state of the fault current of the gas insulated switchgear, continuous flow of alternating current of large current and / or small current between the fixed arc contactor and the movable arc contact deteriorates AC blocking performance of the composite SOE type gas circuit breaker. The deterioration of the AC blocking performance of the composite SOFC 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 the expansion chamber promotes the sputtering of the contact guider and / or the expansion chamber over time.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a complex SOF type 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.

In the gas insulated switchgear according to the embodiments of the present invention, the gas insulated switchgear may include a rotary guider, a rotor, and a driving rod in a fixed arc contact in the fixed portion and a movable portion coupled to the fixed portion. The rotating guider may surround the rotor and the driving rod. The rotor may have a cylindrical shape and may have a movable arc contact on one side and an engagement contact on the other side so as to face the central axis from the side wall of the cylinder. The movable arc contact may face the fixed arc contact. The engaging contact may be threadably engaged with the rotating guider through a protrusion located on the outer side wall of the rotor, and may be rotationally coupled to the driving rod through a bearing located inside the rotor.

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

The rotor may be configured to rotate in response to a linear motion of the driving rod.

The composite soot type gas circuit breaker further includes a nozzle and a cylinder sequentially enclosing the rotor. 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 may include a piston in the at least one chamber. The piston may surround the rotor. The rotating guider may be positioned between the piston and the rotor and fixed to the piston.

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

Alternatively, the nozzle, the cylinder, and the drive rod may be configured to perform a linear motion with respect to the piston, and the rotor may be configured to rotate with respect to the piston and the drive rod.

And the movable arc contact is brought into contact with the fixed arc contact through the rotary motion of the rotor, the nozzle, the cylinder, and the linear motion of the driving rod with respect to the piston, .

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

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

The composite arc type gas circuit breaker according to the embodiments of the present invention can rotate the rotor in the movable portion so that the length of the arc generated between the fixed arc contact and the movable arc contact can be made to vary with time to reduce the thickness of the arc .

The composite arc type gas circuit breaker rotates the rotor in the movable part so that the direction of generation of the arc positioned between the fixed arc contact and the movable arc contact varies with time to concentrate an arc between the extreme points of the fixed arc contact and the movable arc contact .

The composite arc type gas circuit breaker reduces the thickness of the arc between the fixed arc contact and the movable arc contact by rotating the rotor in the movable part and concentrates the arc between the extreme points of the fixed arc contact and the movable arc contact, Can be forcibly extinguished.

The combined-arc type gas circuit breaker forcibly destroys the arc between the fixed arc contact and the movable arc contact in a short time by the rotation of the rotor in the movable part, so that the localized temperature of the nozzle and / The rise can be prevented.

The composite soffit type gas circuit breaker forcibly destroys the arc between the fixed arc contact and the movable arc contact in a short period of time by rotation of the rotor in the movable part to prevent sputtering of the nozzle and / or the expansion chamber through the high temperature sulfur hexafluoride gas can do.

The complex SOF type gas circuit breaker can increase the design margin for the driving part that can continuously lower the operating performance of the driving part by corresponding to the miniaturization of the gas insulated switchgear device by rotating the rotor in the movable part.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a composite SOF type gas circuit breaker in a gas insulated switchgear according to embodiments of the present invention. FIG.
FIG. 2 is an enlarged view showing a coupling relationship of a coupling contact of the rotor, a rotating guider, and a driving rod in the 'A' region of FIG.
Figs. 3 to 6 are cross-sectional views illustrating the operation of a composite SOF type gas circuit breaker in a gas insulated switchgear according to embodiments of the present invention.

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

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a composite SOF type gas circuit breaker in a gas insulated switchgear according to embodiments of the present invention. FIG. In this case, Fig. 1 shows a composite SOF type gas circuit breaker in the state of normal current of the gas insulated switchgear.

Referring to FIG. 1, a complex SOF type gas circuit breaker 60 according to embodiments of the present invention includes a fixing portion 10 and a movable portion 50. The fixing portion 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 is 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 portion 50. The movable part 50 is inserted into the fixed part 10 and is coupled to the fixed part 10. The movable portion 50 includes a rotor 22, a nozzle 26, and a cylinder 29. The rotor 22 and the nozzle 26 protrude from the fixing portion 10 while being partially inserted into the fixing portion 10.

The rotor 22 may be a cylinder. The rotor 22 has a movable arc contact 21 on one side and an engagement contact 23 on the other side so as to face the center axis from the side wall of the cylinder. The movable arc contact 21 is in contact with 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. Therefore, the rotor 22 protrudes from the nozzle 26. The nozzle 26 has a fluid path therein. The cylinder 29 extends along the rotor 22 while partially surrounding the nozzle 26 in the periphery of the insulating member 3. In this case, the rotor 22, the nozzle 26 and the cylinder 29 define the expansion chamber 32 and the rotor 22 and the cylinder 29 define the 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 each other through the 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) performs horizontal left / right movement in the compression chamber (36).

The piston (38) surrounds the rotor (22). Meanwhile, the composite SOF type gas circuit breaker 60 further includes a rotating guider 43 and a driving rod 49 in the movable portion 50. The rotary guider 43 is positioned between the rotor 22 and the piston 38 and is fixed to the piston 38. The rotary guider 43 surrounds the rotor 22 and the drive rod 49, which are arranged in order horizontally.

In this case, the engaging contact 23 is engaged with the plurality of grooves 43a of the rotary guider 43. The coupling contact 23 is coupled to the driving rod 49 via a bearing 46 located inside the rotor 22. The rotor 22, the nozzle 26, the cylinder 29, and the drive rod 49 can be moved relative to the piston 38 or the rotary guider 43.

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

FIG. 2 is an enlarged view showing a coupling relationship of a coupling contact of the rotor, a rotating guider, and a driving rod in the 'A' region of FIG.

Referring to Fig. 2, the engaging contact 23 has a protrusion 23a. The projecting portion 23a is formed along the outer sidewall of the rotor 22. The rotary guider 43 includes a plurality of grooves 43a and a through hole 43b therein. The plurality of grooves 43a may be positioned along the through hole 43b to form a single spiral groove in the rotary guider 43. [

The through-hole 43b can guide 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 driving rod 49. [ The projecting portion 23a of the engaging contact 23 can be positioned in the grooves 43a of the rotary guider 43. [ That is, the coupling contact 23 is screwed to the rotary guider 43 through the protruding portion 23a located on the outer side wall of the rotor 22.

Further, the rotor 22 has bearings 46 therein. The bearing 46 is fixed to the second connecting member 49a of the driving rod 49 by being surrounded by the engaging contact 23. Thus, the engagement contact 23 is rotationally coupled to the drive rod 49 through a bearing 46 located inside the rotor 22. [ When the driving rod 49 linearly moves in the first direction D1 or the second direction D2, the rotor 22 rotates the piston 38, the rotary guider 43, and / The rod 49 can be rotated in the third direction D3.

Figs. 3 to 6 are cross-sectional views illustrating the operation of a composite SOF type gas circuit breaker in a gas insulated switchgear according to embodiments of the present invention. In this case, Fig. 3 shows the operation of the composite SOF type gas circuit breaker in the state of normal current of the gas insulated switchgear.

Figs. 4 to 6 show the operation of the composite SOF type gas circuit breaker in a state of a fault current of the gas insulated switchgear. FIG. 5 is an enlarged view showing the length and thickness of the arc in the nozzle according to time in the 'B' region of FIG.

Referring to FIG. 3, the composite SOI-type gas circuit breaker 60 has a fixing portion 10 and a piston 38 fixed to the gas insulated switchgear. The composite SOE-type gas circuit breaker 60 includes a rotor 22, a nozzle 26, a cylinder 29, and / or the like, which move horizontally relative to the fixed arc contact 9 and / And further has a driving node 49. In this case, the rotor 22, the nozzle 26 and the cylinder 29 are fixed to each other.

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

The rotary guider 43 is fixed to the piston 38. [ The rotary guider 43 is screwed to the engaging contact 23 of the rotor 22 through a plurality of grooves 43a as shown in Fig. The coupling contact 23 is rotationally coupled to the driving rod 49 through a bearing 46 located inside the rotor 22. [ The driving rod 49 can be operated through a driving unit (not shown).

On the other hand, in the state of normal current of the gas insulated switchgear, the rotor 22, the nozzle 26 and the cylinder 29 move in the left direction relative to the piston 38, . In this case, the movable arc contact 21 is fixed to the piston 38 through the rotational motion and / or the linear motion of the rotor 22, the nozzle 26, the cylinder 29 or the drive rod 49 And contacts 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 cause a large alternating current to flow to the composite SOFG 60. In addition, the compression chamber 36 can have a gas storage capacity greater than that of FIG. 4 or 6 due to the movement of the cylinder 29. The compression chamber 36 may be filled with low temperature sulfur hexafluoride (SF6) gas.

4, the rotor 22, the nozzle 26, the cylinder 29, and the drive rod 49 are relatively moved relative to the piston 38 in the state of a fault current of the gas insulated switchgear And move in the second direction D2. In this case, the drive node 49 can linearly move in the second direction D2 relative to the piston 38 and / or the rotating guider 43.

The rotor 22, the nozzle 26 and the cylinder 29 are capable of rotating in the third direction D3 with respect to the piston 38 and the drive rod 49. Alternatively, the nozzle 26, the cylinder 29 and the drive rod 49 may be moved linearly in the second direction D2 relative to the piston 38, The driving rod 49 can be rotated in the third direction D3.

Through this, the rotor 22 can rotate about the center 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 a first arc 62a in the nozzle 26 using a large alternating current. The first arc (62a) is generated between the fixed arc contact (9) and the movable arc contact (21).

The first arc 62a can be rotated in the fourth direction D4 between the fixed arc contact 9 and the movable arc contact 21 corresponding to the rotational motion of the rotor 22. [ The rotational motion of the first arc 62a will be described in more detail in FIG. The first arc 62a can generate hot sulfur hexafluoride gas by heating low-temperature sulfur hexafluoride gas using thermal energy.

The high-temperature sulfur hexafluoride gas can move along the flow line 64 which diffuses from the high-temperature nozzle 26 toward the low-temperature expansion chamber 32. On the other hand, the low temperature sulfur hexafluoride gas in the compression chamber 36 can be compressed by the piston 38 due to the movement of the cylinder 29.

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 contacts the fixed arc contact 9 And the movable arc contact 21 in the fourth direction D4. In this case, the first arc 62a is converted into 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 in such a manner that the produced length and the thickness of the first arc 62a are different from each other with respect to time. This is because the first arc 62a is formed along the flow of a large current of alternating current between the inwardly bent surface of the fixed arc contact 9 and the contact surface of the movable arc contact 21, Is moved along the fifth direction D5 between the apexes of the fixed arc contact 9 and the movable arc contact 21 having the greatest static electricity per unit area due to the rotational motion of the rotor 22, .

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 connected between the fixed arc contact 9 and the movable arc contact 21 The length and thickness of the first arc 62a may be different from that of the first arc 62a. That is, the generated length of the second arc 62b is larger than the length of the first arc 62a, and the thickness of the second arc 62b is smaller than the thickness of the first arc 62a.

6, when the high-temperature sulfur hexafluoride gas has a gas pressure greater than a threshold value in the expansion chamber 32, the high-temperature sulfur hexafluoride gas flows from the expansion chamber 32 toward the nozzle 26 And can be moved along the flow line 66 that is diffused. Therefore, the high-temperature sulfur hexafluoride gas can be diffused 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 an arc 68 that breaks 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. The broken arc 68 can prevent the flow of a large 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 from the compression chamber 36 into the compression chamber 36 toward the nozzle 26. The low-temperature compressed gaseous sulfur hexafluoride gas, although not shown in FIG. 6, can completely destroy the arc 68 broken 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 blown out in a short time by using the high-temperature sulfur hexafluoride gas and the low-temperature compressed compressed sulfur hexafluoride gas, the driving unit of Fig. 3 can cope with downsizing of the gas- And can be designed to be smaller in size than the conventional technology.

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; Insulating member, 6; The first connecting member
9; Fixed arc contact, 10; [0035]
21; Movable arc contact, 22; Rotor
23; Coupling contacts, 23a; projection part
26; Nozzle, 29; cylinder
32; An expansion chamber, 34; Connection holes,
36; Compression chamber. 38; piston
43; A rotary guider, 43a; home
43b; Through hole, 46; bearing
49; Drive rod, 49a; The second connecting member
50; A moving part, 60; Combustion type gas circuit breaker
62a, 62b, 68; Arcs, 64, 66; Flow lines
A, B; Enlarged regions, C; Center axis,
D1, D2, D3, D4, D5; First to fifth directions.

Claims (8)

In the gas-insulated switchgear of the present invention,
Fixed arc contacts within fixture; And
And a rotating guider, a rotor, and a driving rod in a movable part coupled to the fixed part,
Wherein the rotary guider surrounds the rotor and the drive rod,
The rotor having a movable arc contact on one side and an engagement contact on the other side so as to face the central axis from the side wall of the cylinder,
The movable arc contact is provided to face the fixed arc contact,
A plurality of grooves and through-holes are formed in the rotary guider,
Wherein the plurality of grooves are positioned along the through-hole to form a single spiral groove in the rotary guider,
The coupling contact is spirally coupled to the spiral groove of the rotary guider through a protrusion located on the outer side wall of the rotor and is positioned inside the rotor so that the rotor can rotate when the driving rod is linearly moved Wherein the driving rod is rotatably coupled to the driving rod through a bearing. The method according to claim 1,
Wherein the rotor is configured to rotate about a central axis of the fixed arc contact. delete The method according to claim 1,
Further comprising a nozzle and a cylinder sequentially enclosing the rotor,
Said nozzle projecting toward said fixed arc contact surrounding said movable arc contact,
The cylinder projecting from the nozzle defining at least one chamber on the rotor and comprising a piston in the at least one chamber,
The piston surrounds the rotor, and
Wherein the rotary guider is positioned between the piston and the rotor and fixed to the piston. 5. The method of claim 4,
Wherein the drive rod makes a linear motion with respect to the piston, and
Wherein the rotor, the nozzle, and the cylinder are configured to rotate with respect to the piston and the drive rod. 5. The method of claim 4,
Wherein the nozzle, the cylinder and the drive rod make linear motion with respect to the piston, and
And the rotor is configured to rotate in relation to the piston and the drive rod. 5. The method of claim 4,
Wherein when the gas-insulated switching device is in a state of normal current,
Wherein the movable arc contact is configured to contact the fixed arc contact through the rotor, the nozzle, the rotational motion of the cylinder, and the linear motion of the drive rod with respect to the piston. 5. The method of claim 4,
Wherein when the gas-insulated switchgear is in a state of a fault current,
Wherein the movable arc contact is configured to be separated from the stationary arc contact through a rotational motion of the rotor, the nozzle, the cylinder, and a linear motion of the drive rod with respect to the piston.

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