KR20060109072A - Hybrid type gas interrupter with an arc contact having a compressible cylinder - Google Patents

Abstract

A hybrid type gas interrupter using an arc contact point having a compression cylinder is provided to improve an interruption performance of a small electric current by dualizing the interruption performance based on amplitude of the current. An operator, which provides power for driving a driving unit of a gas interrupter with power, is installed on the position to change an installation position from a conventional movable arc contact point to a fixed arc contact point. The conventional fixed arc contact point is a movable arc contact point(604). A compression cylinder(613), which compresses a gas to raise a pressure for interrupting a small electric current, is installed on the inside of the movable arc contact point(604). A conventional movable arc contact point becomes a fixed arc contact point(607) corresponding to a change from the conventional fixed arc contact point to the movable arc contact point(604). A second heat expansion room(612) as a space for expanding a gas by an arc generated from a separation of the movable arc contact point(604) and the fixed arc contact point is installed on a rear end of the fixed arc contact point(607).

Description

Hybrid type gas interrupter with an arc contact having a compressible cylinder}

1 is a view showing the structure of the breaker of the conventional pure paper extinguishing gas circuit breaker.

2A to 2E are views sequentially showing a fault current blocking operation in a breaker of the pure paper extinguishing gas circuit breaker of FIG.

Figure 3 is a view showing the structure of a conventional series type combined gas fire protection unit.

Figure 4 is a view showing the structure of the conventional parallel AC type gas shielding.

5 is a view showing a gas density distribution at a shock wave generation point when an arc is generated at a breaker of a general gas circuit breaker.

Figure 6 is a view showing the structure of a multi-protective gas shutoff structure employing an arc contact with a compression cylinder according to the present invention.

FIG. 7 is an enlarged fragmentary view showing a structure of an exhaust port formed at the tip of a movable arc contact of the composite fire gas shutoff structure of FIG. 6; FIG.

8a to 8e sequentially show the fault current blocking operation of the multi-protective gas shutoff structure employing the arc contact with the compression cylinder of the present invention.

<Explanation of symbols for the main parts of the drawings>

601 ... Operator 602 ... operator and breaker connection rod

603 ... piston 604 ... Movable arc contact

605 ... first nozzle 606 ... second nozzle

607 ... Fixed arc contact 608 ... First thermal expansion chamber

609 ... 3rd nozzle 610 ... backflow check plate

611 gas outlet 612 second thermal expansion chamber

613 Compression cylinder 614 Connecting passage

615 tank 604b gas exhaust

The present invention relates to a composite fire gas shutoff structure employing an arc contact with a compression cylinder. In particular, it is possible to mount an electric spring manipulator or an MDDM type manipulator by reducing the operating force required for the shutoff operation, and to provide a shutoff performance according to the current magnitude. The present invention relates to a dual protective gas shutoff structure employing an arc contact having a compression cylinder capable of dualizing and improving a small current breaking performance which is a weak part of the composite protective shield.

If a fault occurs in the power system, the fault current must be cut off in order to protect the system and various power devices, and the circuit breaker is responsible for breaking the fault current.

1 is a view showing the structure of the breaker of the conventional pure paper extinguishing gas circuit breaker.

Referring to Figure 1, the conventional pure paper arc extinguishing gas breaker of the breaker is the manipulator 101, the connecting rod 102 of the manipulator and the breaker, the piston 103, the cylinder rod 104, the popper cylinder 105, the movable arc It consists of the contact point 106, the 2nd nozzle 107, the 1st nozzle 108, the fixed arc contact 109, and the tank 110. As shown in FIG.

In a conventional circuit breaker having the above configuration, the circuit breaker is closed in the normal state and transmits electricity while passing a rated current (when the stroke is 0). However, once a fault or accident occurs and a fault current reaching about 10 times or more of the normal current flows, the driving coil of the manipulator 101 is excited by the fault current and the electromagnetic force generated in the coil is operated by the manipulator 101. By operating the switch, the manipulator 101 moves the blocking unit as shown in FIG. 2A. When the manipulator pulls the movable part of the breaker (connection rod 102, cylinder rod 104, popper cylinder 105, movable arc contact 106, second nozzle 107 and first nozzle 108) from left to right SF ₆ gas in the popper cylinder 105 is automatically compressed by the piston 103, as in FIGS. 2B and 2C. Also, as the movable portion moves, as in FIGS. 2B and 2C, the movable arc contact 106 and the fixed arc contact 109 are separated, and an arc 200 is generated between the two arc contacts. The arc 200 is blown with SF ₆ gas compressed in the popper cylinder 105 to extinguish the fault current, as in FIGS. 2D and 2E. This blocking method is referred to as "pure paper extinguishing method".

By the way, the conventional gas circuit breaker as described above has a large number of moving parts to be driven by the manipulator 101, and also weighs a lot. In particular, when the blocking capability is insufficient, that is, when the pressure rise of the popper cylinder 105 for arc extinguishing is insufficient, the movable part of the breaker must be moved at a high speed in order to increase the pressure of the popper cylinder 105. However, when the weight of the breaker movable part is large, not only the mechanical burden on the manipulator 101 is large, but also the limit on the operating force.

Existing breakers are manipulators using hydraulic or pneumatic pressure. However, due to environmental problems such as oil leakage, high noise during operation, economics due to a large number of parts, and maintenance problems, developed countries restrict or exclude the use of hydraulic or pneumatic actuators. Instead, electric spring actuators or motor direct drive are used. It requires the use of mechanism. However, electric spring manipulators or MDDM manipulators have much lower operating force than hydraulic or pneumatic systems. Therefore, in order to employ an electric spring or MDDM type manipulator, a method of reducing the operating force required for blocking is required.

As shown in Figs. 3 and 4, the composite fire protection unit combining the expansion chambers 313 and 413 with the existing papper cylinders (Paper chambers) 305 and 405 is shown to reduce the operating force. This multi-block breaker is a large current interruption of more than a thousand amperes (A) is a gas that naturally expands into the expansion chamber 313 by the arc energy generated in the blocking process, and then the arc furnace again when the pressure rises in the expansion chamber 313 The thermal expansion extinguishing method of extinguishing arcs by spraying, and the small current interruption of several thousand amps or less, are used to extinguish the arcs with gas compressed by the piston in the paper chambers 305 and 405 by mechanical action of the breaker. It is a blocking part combining "Paper extinguishing method". Conventional "pure paper arc extinguishing" interruptions are focused on breaking large currents regardless of the magnitude of the current, so even when breaking small currents, arcs are fired with more papillary pressure rise than necessary. 3 and 4, reference numerals 303 and 403 denote pistons, 304 and 404 cylinder rods, 306 and 406 movable arc contacts, 307 and 407 insulation covers, 308 and 408 movable main contacts, 309 and 409 shields, and 310 and 410 nozzles, and 311 and 411 denote fixed arc contacts, respectively. .

However, since the complex extinguishing blocker blocks only a small current due to the pressure rise of the papillae, the volume of the papillae can be reduced and thus the operating force can be reduced. It appeared for this purpose that the expansion chamber 313 of FIG. 3 and the papillary chamber 305 are arranged in series, the so-called "serial combined type gas shutoff part" and the expansion chamber of FIG. 413) and the papper chamber 405 are arranged in parallel and have a common flow path of hot gas and cold gas, so-called "parallel alternating-type combined arc extinguishing gas blocking part (Korean Patent Registration No. 10-0345691)". This can reduce the operating force to some extent.

However, even in the case of such a composite fire protection unit, there are still many parts to operate the manipulator, and the weight may still act as a burden in terms of the manipulator. In addition, the "serial combined type fire protection gas shut off part" of FIG. 3 and the "parallel cross type combined type fire protection gas shut off part" of FIG. 4 are the expansion chamber 313 (413) and the papper cylinder (papaer seal) 305 (405) ), The mechanical pressure of the manipulator must compress not only the popper cylinders 305 and 405 but also the expansion chambers 313 and 413 together to obtain the necessary pressure rise for the shutoff. Therefore, there is a big limitation in reducing the operating force of the manipulator, and there may be a case in which a pressure increase necessary for breaking a small current cannot be obtained. Performance ∝P ^1.4 ). In addition, since the hot gas expanded by the arc energy at the time of breaking the large current can flow back into not only the expansion chamber but also the papper chamber, when the arc energy is small, the pressure rise necessary for breaking the large current may not be obtained. In addition, since the expanded hot gas may also flow into the papilla, the pressure rise of the hot gas may act as a repulsive force on the operating force of the manipulator.

In addition, the conventional Paperine type circuit breaker is adapted to the large current blocking, so the flow of gas compressed at high speed from the paper cylinder turns into a supersonic flow as it exits the nozzle, and the shock wave at the tip of the arc contact by the supersonic flow. A shock wave occurs. As shown in FIG. 5, this shock wave is known to be a major cause of the breakdown of the gas density and the breakdown of the interelectrode at the time of breaking the small current (the small current breaking performance is proportional to the gas density, that is, ∝p ^b , b Is the experimental constant).

The present invention has been made in view of the problems in the conventional gas shutoff as described above, it is possible to mount an electric spring manipulator or MDDM type manipulator by reducing the operating force required for the shut-off operation, dualizing the breaking performance according to the current magnitude, An object of the present invention is to provide a composite protective gas barrier structure employing an arc contact having a compression cylinder that can improve the small current blocking performance, which is a weak part of the composite protective shield.

In order to achieve the above object, a composite arc gas shutoff structure employing an arc contact having a compression cylinder according to the present invention,

In the case of a combined fire protection gas shutoff unit having a fixed arc contact, a movable arc contact, and a thermal expansion chamber, for blocking the occurrence of a fault current.

Assuming that the existing manipulator that provides power for the operation of the movable portion of the gas shut-off part is installed by changing the position from the existing movable arc contact side to the fixed arc contact point, the existing fixed arc contact is movable arc contact, Moving arc contact The inside of the movable arc contact is to obtain the pressure increase necessary to cut off the small current in the fault current. A compression cylinder for gas compression is provided, and the existing fixed arc contact is movable arc contact. Correspondingly, a second thermal expansion chamber is provided at the rear end of the fixed arc contact in which the existing movable arc contact becomes the fixed arc contact as a space for gas expansion by the arc generated when the movable arc contact and the fixed arc contact are separated. Has its features.

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

6 is a view showing the structure of a multi-protective gas cut-off structure employing an arc contact having a compression cylinder according to the present invention.

Referring to FIG. 6, a composite extinguishing gas shutoff structure employing an arc contact with a compression cylinder according to the present invention is to block the occurrence of a fault current and has a fixed arc contact, a movable arc contact, and a thermal expansion chamber. In the SOHO gas shutoff part, a pre-existing manipulator 601 for providing power for operating the movable part of the gas shutoff part is installed on the fixed arc contact side with a position that is installed on the existing movable arc contact side. To make the existing fixed arc contact movable arc contact, and to obtain the pressure rise necessary for the interruption of the small current in the fault current inside the movable arc contact 604 which is made movable arc contact. Compression cylinder 613 is provided, and the existing movable arc contact is fixed in correspondence with the movable arc contact to the existing fixed arc contact A second thermal expansion chamber 612 is provided at the rear end of the fixed arc contact 607 that has been contacted as a space for gas expansion by the arc generated when the movable arc contact 604 and the fixed arc contact 607 are separated. do.

Here, a gas exhaust port 604b for exhausting the gas compressed by the piston 603 is formed at the front end of the movable arc contact 604. As shown, this gas exhaust mechanism 604b is formed in the form of a cluster of a plurality of fine holes, and the size of each exhaust port is 1.0 mm or more in diameter. In addition, the position of the exhaust port is the most vulnerable to the insulation recovery characteristic, and is located at a curved portion between 30 ° and 90 ° up and down from the center axis (horizontal axis) of the tip of the movable arc contact 604.

In addition, at the end of the connection passage 614 where the second thermal expansion chamber 612 meets the first thermal expansion chamber 608 by the connection passage 614, the connection passage (from the second thermal expansion chamber 612) is preferably used. A gas backflow prevention plate 610 is provided to prevent the gas introduced into the first thermal expansion chamber 608 from flowing back to the second thermal expansion chamber 612 through the connection passage 614. In FIG. 6, reference numeral 602 denotes a connecting rod of the manipulator and the blocking unit, 605 denotes a first nozzle, 606 denotes a second nozzle, 609 denotes a third nozzle, 611 denotes a gas outlet, and 615 denotes a tank.

Then, the fault current interruption operation of the composite arc gas shutoff structure employing the arc contact having the compression cylinder of the present invention having the above configuration will be described with reference to FIGS. 8A to 8E.

Referring to FIG. 8A, when the manipulator 601 (see FIG. 6) of the breaker receiving the open signal starts to move, the breaker connecting rod 602 (see FIG. 6) is moved, that is, the movable arc contact. 604 is moved from right to left to begin to compress the gas inside the compression cylinder 613 in the movable arc contact 604.

As the movable portion moves, as in FIG. 8B, the movable arc contact 604 and the fixed arc contact 607 are separated and an arc occurs between the two arc contacts. The arc expands mainly the gas of the second thermal expansion chamber 612 (SF ₆ gas is usually filled with 6 bar in the tank), and a portion of the expanded gas passes through the connecting passage 614 to the first thermal expansion chamber ( 608 (at this moment, the backflow preventing plate 610 is opened because the pressure in the second thermal expansion chamber 612 is higher than the pressure in the first thermal expansion chamber 608), and part of the gas outlet 611 of the cylinder rod is entered. Exit to). On the other hand, the gas in the compression cylinder 613 of the movable arc contact 604 is continuously compressed by the movement of the movable portion and the action of the piston 603 while simultaneously cooling the arc generated between the two arc contacts.

When the movable arc contact 604 moves further and is in the same position as in FIG. 8C, the arc energy increases further, at which time the expanded gases enter the first thermal expansion chamber 608 directly in the space between the two arc contacts. Alternatively, the second thermal expansion chamber 612 and the connection passage 614 and the backflow prevention plate 610 enter the first thermal expansion chamber 608 to increase the pressure of the first thermal expansion chamber 612. At this time, some expanded gas also exits to the gas outlet 611 of the cylinder rod. On the other hand, the gas in the compression cylinder of the movable arc contact 604 is continuously compressed by the movement of the movable part and the action of the piston 603, and simultaneously cools the arc generated between the two arc contacts.

As the pressure in the first thermal expansion chamber 612 increases, the gases in the first thermal expansion chamber 612 return through the flow path and arc extinguish, as shown in FIG. 8D. At the same time, the gas compressed in the compression cylinder 613 exits through the exhaust port 604b of the movable arc contact 604 to cool the arc and simultaneously increase the gas pressure around the arc tip.

Thereafter, as shown in FIG. 8E, the heat gas remaining between the two arc contacts after the arc is extinguished is cooled by the residual gas from the first thermal expansion chamber 608 to succeed in "thermal recovery", and the gap between the two arc contacts. As this opens, and as the gas supply in the compression cylinder 613 of the movable arc contact 604 continues, "insulation recovery" succeeds and the current interruption succeeds.

As described above, the composite extinguishing gas shutoff structure employing the arc contact with the compression cylinder according to the present invention is provided with a compression cylinder inside the movable arc contact, and a second thermal expansion chamber is provided at the rear end of the fixed arc contact. It has the following advantages and effects.

1) Since only the operating arc contact is required for the manipulator to operate, the number of parts and weight can be greatly reduced compared to the existing breaker. This makes it much easier to mount an electric spring or MDDM actuator.

2) The pressure rise necessary for the small current breaking performance can be obtained directly through the compression cylinder of the movable arc contact. In particular, the gas density can be directly increased between 40 ° to 70 ° of the tip of the arc contact where the electric field is most concentrated, and there is no possibility of generating shock waves that are a problem in the conventional paper breaker.

3) When the large current is interrupted, the heat gas expanded by the arc energy flows into the first thermal expansion chamber through the second thermal expansion chamber, the connecting passage and the backflow preventing plate, so that the pressure increase required for the large current interruption can be easily obtained in the first thermal expansion chamber. .

4) If the pressure increase necessary for breaking a large current is insufficient, it can be easily obtained by adjusting the diameter of the third nozzle.

Claims (5)

In the case of a combined fire protection gas shutoff unit having a fixed arc contact, a movable arc contact, and a thermal expansion chamber, for blocking the occurrence of a fault current. Assuming that the existing manipulator that provides power for the operation of the movable portion of the gas shut-off part is installed by changing the position from the existing movable arc contact side to the fixed arc contact point, the existing fixed arc contact is movable arc contact, Moving arc contact The inside of the movable arc contact is to obtain the pressure increase necessary to cut off the small current in the fault current. A compression cylinder for gas compression is provided, and the existing fixed arc contact is movable arc contact. Correspondingly, a second thermal expansion chamber is provided at a rear end of the fixed arc contact in which the existing movable arc contact becomes a fixed arc contact as a space for gas expansion by the arc generated when the movable arc contact and the fixed arc contact are separated. A composite arc gas shutoff structure employing an arc contact with a compression cylinder. The method of claim 1, And a gas exhaust mechanism for exhausting the gas compressed by the piston is formed at the tip of the movable arc contact. The method of claim 2, The gas exhaust vent is formed in the form of a group of a plurality of fine holes, the size of the individual exhaust port is a combined extinguishing gas cutout structure employing an arc contact with a compression cylinder, characterized in that the diameter is 1.0mm or more. The method of claim 2, The position of the gas exhaust port is a combined protection gas cut-off unit employing an arc contact with a compression cylinder, characterized in that located on the curved portion between the top and bottom 30 ° to 90 ° from the center axis (horizontal axis) of the tip of the movable arc contact. Structure. The method of claim 1, At the end of the connection passage where the second thermal expansion chamber meets the first thermal expansion chamber by a connection passage, gas introduced into the first thermal expansion chamber from the second thermal expansion chamber via the connection passage is again flowed back through the connection passage to the second thermal expansion chamber. A multi-protective gas shutoff structure employing an arc contact with a compression cylinder, characterized in that a gas backflow prevention plate is provided to prevent it.

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