KR100770330B1 - Hybrid type gas interrupter with one united body of a puffer cylinder and a thermal-expansion chamber - Google Patents

Abstract

A hybrid type gas interrupter is provided to reduce the weight and the volume of the gas interrupter by integrating a puffer cylinder with a thermal-expansion chamber. A hybrid type gas interrupter(306) includes a thermal-expansion chamber, a puffer cylinder, a fixed main contact node(309), a fixed arc contact node, a movable main contact node(311), a movable arc contact node, and nozzles(307,310). The thermal-expansion chamber is integrated with the puffer cylinder. A piston is reciprocally moved in the cylinder such that a compressed gas is sprayed. A spring(314) for supporting the piston is installed on a body of the piston. A step portion(313) for driving the piston is formed in front of the cylinder. The volume of the cylinder is changed by a pressure difference of the compressed gas and the magnitude of a switch current.

Description

Hybrid type gas interrupter with one united body of a puffer cylinder and a thermal-expansion chamber

1 is a view showing the structure of the conventional arc-type gas shutoff unit separated from the conventional expansion chamber and the popper cylinder.

2a to 2d are views sequentially showing a fault current blocking operation process of a gas-fired gas shutoff unit in which a conventional expansion chamber and a popper cylinder are separated.

Figure 3 is a view showing the structure of the multi- extinguishing type gas shutoff unit is an integral part of the expansion chamber and the papper chamber according to the present invention.

4 is an enlarged partial excerpt of the "A" part of FIG.

FIG. 5 is a view for explaining the adjustment of the length L1 between the piston driving jaw and the piston to the overlapping length L2 of the fixed arc contact and the movable arc contact in the multiple extinguishing gas shut-off part of the present invention. .

Figure 6 is a view showing a state in which the combined extinguishing type gas barrier unit is integrated with the expansion chamber and the papper chamber in accordance with the present invention actually employed in the gas circuit breaker.

7A to 7E are diagrams sequentially showing a fault current blocking operation by a combined extinguishing type gas shutoff unit in which an expansion chamber and a papper chamber are integrated according to the present invention.

Figure 8 is a view showing a comparison of the operation characteristics of each of the conventional complex extinguishing type gas blocking unit and the composite extinguishing type gas blocking unit of the present invention.

9 is a view for explaining the increase in the cylinder volume increased by the expanded gas pressure, not by the mechanical structure, in the composite extinguishing type gas shutoff part of the present invention.

<Explanation of symbols for main parts of the drawings>

101,301 ... Operator 102,302 ... Connection rod

103,303 ... piston 104,304 ... cylinder rod

105.Popper cylinder 106,306 ... Movable arc contact

107,307 ... 2nd nozzle 108,308 ... Movable main contact

109,309 ... Fixed main contact 110,310 ... Nozzle 1

111,311 ... fixed arc contact 112 ... thermal expansion chamber

113,316 ... tank 305 ... piston guide

312 ... cylinder 313 ... piston drive jaw

314 ... Piston support and closing spring

315 ... piston stop

The present invention relates to a gas shutoff part of a breaker employed in industrial power equipment, and more particularly, a movable part for minimizing the breaker part by integrating an expansion chamber and a papper seal in the integrated extinguishing type gas shutoff part. It is possible to reduce the operating force required for the operation of the stroke, the stroke can proceed non-linearly, the expansion chamber and the papper chamber can significantly improve the breaking performance by allowing the volume of the expansion chamber to be automatically adjusted according to the magnitude of the breaking current. The integrated extinguishing type gas shutoff unit is provided.

If a fault occurs in the power system, the fault current must be cut off to protect the power system and various power equipment. The circuit breaker performs the duty of breaking the fault current.

In order to reduce the operating force of the current paper-type circuit breaker, the newly emerged is a compound extinguishing type blocking unit combining an expansion chamber with an existing paper chamber. The multi-block breaker inserts a gas that naturally expands due to arc energy generated during the interruption process by thousands of amps [A] into the expansion chamber 112 (see FIG. 1), and then expands the expansion chamber 112. The thermal expansion extinguishing method, which sprays the arc again to extinguish the arc when the pressure rises, and the small current interruption of several thousand amps [A] or less, is caused by the mechanical action of the breaker and the piston in the popper chamber 105 (see FIG. 1). It is a block | block part of the form which combined the "Paper extinguishing system" which extinguishes an arc with the gas compressed by 103. In the existing "pure paper arc extinguishing system" breaker, the current is focused on breaking the large current regardless of the large current or the small current, so even when the small current is cut off, the arc is extinguished due to the increase in the pressure of the papilla more than necessary. Therefore, a large operating force is always required. However, in the complex extinguishing type blocking part, only a small current is cut off due to the pressure rise of the papillary, so the volume of the papillary can be reduced and thus the operating force can be reduced. Presented for this purpose is a composite of the expansion chamber and the popper cylinder separated from the domestic patent application No. 10-2004-0019049 (hereinafter referred to as "first application") filed by the applicant and the same applicant as shown in FIG. SO-type gas shutoff unit ".

Referring to FIG. 1, a compound extinguishing type gas shutoff part in which an expansion chamber and a popper cylinder of a prior application are separated, a fixed main contact 109, a movable main contact 108, for energizing normal current and blocking a fault current, A fixed arc contact 111 and a movable arc contact 106, a paper cylinder 105 that compresses gas by the action of the piston 103, and a cylinder that guides the reciprocating linear motion of the piston 103. The rod 104 and the expansion chamber 112 which is provided on one side of the popper cylinder (paper chamber) 105 and heat-gas is introduced to increase the gas pressure, the fixed arc contact 111 and the movable arc contact ( The first and second nozzles 110 and 107 for guiding contact and separation of the 106 and the tank 113 wrapped and protecting the respective components as described above and filled with insulating gas SF ₆ therein. Is basically provided, and in addition, the movable part is moved to increase the blocking performance of the gas shutoff part. A and a connecting rod 102, a controller 101 that provides power for the movement of the moving part to pass.

2A to 2D are diagrams sequentially illustrating a fault current blocking operation process of the conventional arc-type gas shutoff unit in which the expansion chamber and the popper cylinder of the prior application are separated as described above.

Referring to FIG. 2A, which is a stroke 20% state, a fault occurs in the power system in the stroke 0% state (normally energized state) of FIG. 1, and a movable part (movable main contact 108) is operated to block a fault current. The arc contact 106, the paper cylinder 105, the first and second nozzles 110, 107 begin to move, and the cold-gas in the papillary begins to compress.

FIG. 2B shows the stroke 60%, wherein the arc 150 is generated between the two arc contacts 106 and 111 while the fixed arc contact 111 and the movable arc contact 106 are separated from each other. The expanded gas flows back into the expansion chamber 112, and the cold-gas of the pap chamber 105 cools the arc 150.

FIG. 2C shows a stroke 70% state, in which the pressure in the expansion chamber 112 is increased and the gas that flowed back into the expansion chamber 112 is ejected into the arc 150 to extinguish the arc 150. Cold-gas cools the arc 150.

2D shows a 90% stroke, arc 150 is extinguished, and the cold-gas of the papillary 105 cools and heats the hot gas remaining between the fixed arc contact 111 and the movable arc contact 106. The recovery performance is improved, and cold-gas is continuously supplied between the two arc contacts 106 and 111 to increase the insulation performance, thereby improving the insulation recovery performance.

The composite extinguishing type gas shutoff unit in which the above-expanded (conventional) expansion chamber and the paper cylinder are separated as described above has the same breaking performance as the conventional paper breaker but can significantly reduce the operating force. However, since the expansion chamber 112 and the papper chamber 105 must be provided separately, the size of the blocking portion may be increased, and the structure may be complicated.

On the other hand, a circuit breaker rarely blocks only 100% of rated fault current (break current). In most cases, depending on the type of failure, it is necessary to cut 10% or 50% of the rated breaking current. In this regard, the International Standard (IEC) strictly regulates the current level to be blocked for each duty to verify the performance of the circuit breaker. That is, duty No. 1 is set at 10% of rated breaking current, No. 2 at 30%, No. 3 at 60%, No. 4 at 100%, no. 5 at 100% added with DC, and SLF90 at 90% of rated breaking current. The circuit breaker does not have a breaking performance if any one of these test standards does not pass. Therefore, determining the volume of the expansion chamber that determines the blocking performance is the most important core technology and the most difficult problem for the designer. For example, if the expansion chamber volume is increased to obtain the proper pressure rise considering duty 4 and 5, the duty current 1, 2, 3 will be cut off because the small current does not cause the pressure rise necessary for arc extinguishing. If you fail at random. On the contrary, when focusing on relatively small breaking currents such as duty 1, 2, and 3, a large pressure increase can be obtained due to the tremendous arc energy at duty 4 and 5, but it is expanded by the arc and expands. The seal fails because the heat-gas introduced into the chamber is not easily cooled and ejected back into the arc, and even the heated heat-gas causes the parts of the shield to melt. As such, determining the volume of the expansion chamber that satisfies all the duty 1 to 5 is the key to determining the blocking performance of the MSO, and is the most difficult problem.

In addition, the breakers up to now have cut off the current while the blocking operation is linear, that is, moving at a constant speed. Therefore, the breaker must move quickly at the beginning of the stroke to obtain the high gas density required for small current interruption, and the speed is increased to obtain the expansion pressure of the cylinder after the arc is disconnected to obtain the pressure increase required for the high current interruption. It was difficult to implement the ideal operation of the MSO that should be slow.

The present invention has been made in view of the above matters, and by integrating the expansion chamber and the popper chamber in the complex extinguishing type gas shutoff part, the breaker can be miniaturized to reduce the operation force required for the operation of the movable part for blocking the fault current. The stroke can be carried out nonlinearly, and the integrated extinguishing type gas shutoff unit which is integrated with the expansion chamber and the papper chamber can dramatically improve the breaking performance by allowing the volume of the expansion chamber to be automatically adjusted according to the magnitude of the breaking current. The purpose is to provide.

In order to achieve the above object, the complex extinguishing type gas barrier unit of which the expansion chamber and the papilla according to the present invention is integrated,

It is involved in the interruption of large currents, and once the gas expands naturally by the arc energy generated during the interruption of the large currents, the internal pressure rises, and when the internal pressure rises, the thermal expansion chamber which injects the gas back into the arc to extinguish the arc, It is involved in the breaking, which is a popper seal which arcs arc with compressed gas by the operation of the piston according to the mechanical action of the breaker, and a fixed main contact, a fixed arc contact, and a movable contact for energizing the normal current and blocking the fault current. In the multiple extinguishing gas shut-off part having a contact, a movable arc contact, and a nozzle for guiding contact and separation of the fixed arc contact and the movable arc contact,

The thermal expansion chamber and the papper chamber are integrated into one cylinder space without any distinction, and in the integrated cylinder space, a piston for injecting compressed gas into an arc to block the fault current is installed to reciprocate linearly, and the piston body It is characterized in that a spring is provided for supporting and injecting the piston, and a jaw for driving the piston is formed in front of the cylinder space.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a view showing the structure of the gas extinguishing type of the combined extinguishing chamber and the popper chamber integrated in accordance with the present invention.

Referring to Figure 3, the expansion chamber and the papesil in accordance with the integrated arc-type gas shut-off unit 300 is integrated, the natural current is expanded by the arc energy generated in the process of blocking the large current is involved in the blocking of the large current. Once the gas has been received and the internal pressure rises, the gas is injected into the arc again to extinguish the arc, and it is involved in the interruption of the small current, which is compressed by the operation of the piston according to the mechanical operation of the breaker. A papillary arc arc extinguishing, a fixed main contact 309, a fixed arc contact 311 and a movable main contact 308, a movable arc contact 306, and a fixed arc for energizing normal current and blocking fault current In the multiple extinguishing gas shut-off unit including first and second nozzles 310 and 307 for guiding contact and separation between the contact 311 and the movable arc contact 306, the thermal expansion chamber and the papper chamber are not distinguished. One cylinder 312 is integrated into the space, and in the integrated cylinder 312 space, a piston 303 for injecting the compressed gas into the arc to block the fault current is installed to reciprocate linear movement, the piece As shown in FIG. 4, the tone 303 body is provided with a spring 314 for supporting and injecting the piston 303, and in front of the cylinder 312 space for driving the piston 303. The jaw 313 is formed. In addition, a piston stopper 315 is installed at the rear end of the piston 303 to prevent the piston 303 from being separated from the piston guide 305.

Here, preferably, as shown in FIG. 5, the piston driving jaw 313 and the piston 303 in a state where the fixed arc contact 311 and the movable arc contact 306 are coupled when a steady current is energized. The length L1 between) is adjusted to be equal to the overlapping length L2 of the two arc contacts 311 and 306. Since it is only necessary to obtain the pressure increase necessary for the small current interruption, the length of L1 and L2 is configured to be the same as described above, so that the volume of the cylinder does not have to be increased as in the prior art.

In addition, according to the structural features of the present invention, the space of the integrated cylinder 312 can be varied due to the magnitude of the breaking current and the pressure size of the compressed gas given by the arc duration. This will be described again later with reference to FIG. 9.

In Figure 3, reference numeral 301 is a manipulator for providing a driving force for blocking the fault current to the piston 303 and the movable part, 302 is a connecting rod connecting the manipulator 301 and the breaker, 304 is a cylinder rod, 306 is a movable arc contact 307 denotes a second nozzle, 308 denotes a movable main contact, 309 denotes a fixed main contact, 310 denotes a first nozzle, 311 denotes a fixed arc contact, and 316 denotes a tank having a built-in shield.

FIG. 6 is a view showing a state in which an expansion chamber and a papillar integrated arc-type gas shutoff unit having a configuration as described above are actually employed in a gas circuit breaker. FIG.

As shown in Figure 6, when the expansion-type and the sealer of the present invention is a combined extinguishing type gas shut-off unit 300 is integrated in the gas circuit breaker is not required to increase the volume of the cylinder as in the conventional size of the circuit breaker You can also zoom out.

Then, the fault current interruption operation of the integrated extinguishing gas cutout unit in which the expansion chamber and the papper chamber of the present invention having the above configuration are integrated will be described.

7A to 7E are diagrams sequentially illustrating a fault current blocking operation by a combined extinguishing type gas shutoff unit in which an expansion chamber and a papper chamber are integrated according to the present invention.

First, when a failure occurs in the power system in a normal energized state (state of 0% of stroke), as shown in FIG. 7A, an opening signal is used to block a fault current. The manipulator 301 (see FIG. 3) of the breaker that has been received starts to move and the breaker connecting rod 302 moves the movable parts 304, 306, 307, 308, 310 from left to right to move the gas in the cylinder 312. Start compressing it. In the case of Fig. 7A, the stroke 20% state is shown.

Thereafter, as shown in FIG. 7B, gas compression in the cylinder 312 continues until the piston driving jaw 313 contacts the piston 303. At this time, the fixed arc contact 311 and the movable arc contact 306 is separated, the arc 350 is generated between the two contacts. In the case of FIG. 7B, the stroke 40% state is shown.

FIG. 7C shows the stroke 60% state, and the piston 303 moves together with the movable portion by the piston driving jaw 313. At this time, the heat-gass expanded by the arc 350 are introduced into the cylinder 312.

FIG. 7D illustrates an 80% stroke state. As the fixed arc contact 311 exits the first nozzle 310, the gas introduced into the cylinder 312 is cooled and started to be injected into the arc 350. 350) begins to extinguish.

FIG. 7E shows a 90% stroke state, the arc is extinguished and the gas remaining in the cylinder 312 cools the hot gas remaining between the two arc contacts 306 and 311 to improve thermal recovery performance. As the gap between the two arc contacts 306 and 311 increases, the insulation performance is increased, and thus the insulation recovery is successful, and ultimately, the failure current is blocked.

On the other hand, in the above-described series of fault current interruption operations, as described above, in the interruption unit of the present invention, the fixed arc contact 311 and the movable arc contact 306 are coupled when the normal current is energized. The overlapping length L1 of the two arc contacts and the length L2 between the piston driving jaw 313 and the piston 303 at the time of such engagement are equally configured (see FIG. 5), so that the blocking portion is blocked. The operation may not move linearly as in FIG. 8 (a), but may move nonlinearly as in FIG. 8 (b). That is, the length of the drive unit is automatically increased after L block in FIG. 5, that is, the piston driving jaw 313 is in contact with the piston 303, and the speed is increased as shown in FIG. Will slow down. In this way, the breaker must move quickly at the beginning of the stroke to obtain the high gas density required for small current interruption, and the speed is increased to obtain the inflation pressure of the cylinder after the arc is disconnected to obtain the pressure rise required for the high current interruption. It is possible to realize the ideal operation of the MSO that should be slowed down.

9 is a view for explaining the increase of the cylinder volume increased by the expanded gas pressure, not by the mechanical structure, in the composite extinguishing type gas shutoff part of the present invention.

Referring to FIG. 9, when the breaking current is very large, the volume of the cylinder 312 is automatically increased as the piston 303 retracts due to the expansion pressure of the cylinder 312, and the heat-gas is cooled by the increased volume. This can be done more easily. That is, when cooling is disadvantageous because the expanded gas pressure is large when the blocking current is very large, the piston 303 retreats when the increased expansion pressure is greater than the force of the piston support and injection spring 314 (left in FIG. 9). To the right). Therefore, the volume of the cylinder 312 increases in proportion to the current size, and thus, it is possible to act more advantageously for cooling the expansion gas than the conventional blocking portion having a fixed expansion chamber volume.

As described above, the composite extinguishing type gas shutoff unit in which the expansion chamber and the papil chamber are integrated according to the present invention has the following advantages and effects.

1) Since the expansion chamber and the papillae of the conventional blocking part are integrated, the size and weight of the blocking part can be greatly reduced.

2) Unlike the conventional blocking part, the blocking operation of the blocking part can move linearly without moving linearly, thereby realizing the ideal operation of the combined protection blocker.

3) When the breaking current is very large, the volume of the cylinder is automatically increased as the piston is retracted by the expansion pressure of the cylinder, so that the cooling of the heat-gas can be made easier by the increased volume. Therefore, the volume of the cylinder increases in proportion to the current size, and thus may be more advantageous for cooling the expansion gas than the conventional blocking unit having a fixed expansion chamber volume.

Claims (4)

It is involved in the interruption of large currents, and once the gas expands naturally by the arc energy generated during the interruption of the large currents, the internal pressure rises, and when the internal pressure rises, the thermal expansion chamber which injects the gas back into the arc to extinguish the arc, It is involved in the breaking, which is a popper seal which arcs arc with compressed gas by the operation of the piston according to the mechanical action of the breaker, and a fixed main contact, a fixed arc contact, and a movable contact for energizing the normal current and blocking the fault current. In the multiple extinguishing gas shut-off part having a contact, a movable arc contact, and a nozzle for guiding contact and separation of the fixed arc contact and the movable arc contact, The thermal expansion chamber and the papper chamber are integrated into one cylinder space without being separated, and in the integrated cylinder space, a piston for injecting compressed gas into an arc to block the fault current is installed to reciprocate linearly, and the piston body It is provided with a spring for supporting and injecting the piston, a jaw for driving the piston is formed in front of the cylinder space, the integrated cylinder space of the compressed gas given the magnitude of the breaking current and the arc duration Composite extinguishing type gas shutoff unit is an integral part of the expansion chamber and the papilla chamber, characterized in that the variable pressure. The method of claim 1, The expansion chamber and the wave, characterized in that the length between the piston driving jaw and the piston in the state in which the fixed arc contact and the movable arc contact are coupled at the same time is adjusted to be the overlap length of the two arc contacts. Combination type extinguishing gas shut-off part with integrated persil. The method of claim 1, And a piston stop device for preventing the piston from being separated from the piston guide at the rear end of the piston. delete

Images