JP2013131414A - Puffer type gas circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a puffer type gas circuit breaker including a heat puffer chamber and a machine puffer chamber capable of improving breaking performance.SOLUTION: The puffer type gas circuit breaker includes: a heat puffer chamber 23 which has a fixed main contact 11 and a movable main contact 12, and a fixed arc contact 13 and a movable arc contact 14, capable of contacting and leaving each other, arranged in a container filled with arc-extinguishing insulation gas, is provided with an insulation nozzle 15 to surround the fixed and movable arc contacts 13, 14, and guides insulation gas having been raised in pressure with heat of an arc in an arc space part 19 into a cylinder 21 where the insulation nozzle 15 is fixed; and a machine puffer chamber 23 which is provided in series therewith and raises the pressure of the insulation gas by mechanical compression. Insulation gas swivel flow generation means is provided at a part which links the arc space part 19 and heat puffer chamber 22 to each other.

Description

  The present invention relates to a puffer-type gas circuit breaker, and more particularly to a puffer-type gas circuit breaker including a heat puffer chamber and a mechanical puffer chamber.

  A conventional gas circuit breaker includes both a heat puffer chamber and a mechanical puffer chamber, and a combined type using a heating pressure increasing action and a mechanical compression action by arc heat is known. This combined type puffer type gas circuit breaker can reduce the operation energy required for the breaking operation as compared with the conventional method using only mechanical compression, and can improve the breaking performance.

  For example, in Patent Document 1, an insulating gas having arc extinguishing properties in a thermal puffer chamber whose pressure is increased by arc energy at the time of opening is sprayed on the arc, and then an insulating gas in a mechanically compressed mechanical puffer chamber is sprayed on the arc. Thus, a puffer-type gas circuit breaker that can be surely cut off even with a large current has been proposed. In addition, the puffer-type gas circuit breaker disclosed in Patent Document 1 includes a split member that divides the thermal puffer chamber into a main space on the gas flow path side connected to the arc space and a secondary space outside the thermal puffer chamber, and a central axis of the thermal puffer chamber. They are arranged on concentric circles.

  In the puffer type gas circuit breaker of Patent Document 1, the heat puffer chamber has the above-described structure, so that an insulating gas having a high-temperature and high-pressure extinguishing property generated in the arc space when a large current is interrupted passes through the main space in the sub space. So that it mixes with the relatively low temperature gas present in the sub space. And, the arc-extinguishing insulating gas that becomes relatively low temperature when the medium and small currents are cut off is blown to the arc through the gas flow path of the insulating nozzle, and then the insulating gas from the machine puffer chamber is blown to reliably cut off the arc. It is.

  In Patent Document 2, a puffer cylinder is divided into a heat puffer chamber and a mechanical puffer chamber by a partition wall provided with a check valve from the insulating nozzle side surrounding the fixed and movable arc contacts, and one end is fixed to the partition wall. A puffer-type gas circuit breaker has been proposed in which a cylindrical body is provided inside a heat puffer chamber. In addition, the cylindrical cylindrical body provided in the thermal puffer chamber has a plurality of communication holes, and after the insulating gas from the mechanical puffer chamber flows into the thermal puffer chamber through the check valve, the cylindrical body The structure is such that it quickly flows into the discharge path of the insulating nozzle through the communication hole, and is blown against the arc to block it.

JP 2009-99499 A Japanese Patent Laid-Open No. 2-86023

  However, the puffer-type gas circuit breaker including the heat puffer chamber and the mechanical puffer chamber described in Patent Documents 1 and 2 inevitably forms a blowing pressure by taking in thermal energy from the arc into the heat puffer chamber. There is a problem that the temperature of the blowing gas becomes high. Moreover, the high-temperature arc-extinguishing insulating gas that flows into the heat puffer chamber due to the occurrence of an arc at the time of interruption is sufficiently mixed with the insulating gas having a relatively low temperature existing in the heat puffer chamber before the start of the interruption operation. In addition, there is a problem that the temperature of the blowing gas is not uniform. In any of these cases, the shutoff performance of the puffer type gas circuit breaker will be reduced.

  An object of the present invention is to provide a puffer-type gas circuit breaker including a heat puffer chamber and a mechanical puffer chamber that can improve the blocking performance.

  The puffer-type gas circuit breaker of the present invention includes a fixed and movable main contactor that can be contacted / separated, and a fixed and movable arc contactor that can be contacted / separated in a container filled with an arc extinguishing insulating gas, An insulating nozzle is provided so as to surround the fixed and movable arc contacts, and when the fixed arc contact and the movable arc contact are separated, the fixed and movable arc contacts are separated between the fixed and movable arc contacts. A heat puffer chamber for introducing an insulating gas whose pressure has increased in the arc space by the heat of the arc formed, and a mechanical puffer provided in series in the heat puffer chamber to increase the pressure of the insulating gas by mechanical compression When the apparatus is provided with a chamber, an insulating gas swirl flow generating means is provided at a portion connecting the arc space portion and the heat puffer chamber.

  Preferably, the insulating gas swirl flow generating means is disposed in the heat puffer chamber and is a portion that communicates with the interior of the gas flow path and a cylindrical guide that divides the gas space into which the insulating gas is introduced, and the cylindrical guide It is characterized by comprising a plurality of openings formed so as to extend from the gas flow path in the circumferential direction of the gas space.

  Further preferably, the insulating gas swirl flow generating means is constituted by a plurality of spiral grooves formed on at least one of the inner surface of the insulating nozzle or the outer surface of the movable arc contactor cover in contact with the gas flow path of the insulating gas. It is characterized by.

  According to the puffer type gas circuit breaker of the present invention, since the insulating gas swirl flow generating means is provided in the portion connecting the arc space portion and the heat puffer chamber, there is a high temperature arc extinguishing property flowing into the heat puffer chamber. A swirl flow is given to the insulating gas, and the swirl flow sufficiently mixes the low-temperature insulating gas existing in the heat puffer chamber, so that the temperature can be lowered uniformly. For this reason, since the temperature of the insulating gas in the heat puffer chamber can be uniformly lowered and sprayed onto the arc, the shutoff performance can be further improved.

It is a schematic sectional drawing which shows the state of the heat puffer chamber at the time of the arc generation in the puffer type gas circuit breaker which is one Example of this invention. It is a longitudinal cross-sectional view of the AA line of FIG. It is a schematic sectional drawing which shows the state of a heat puffer chamber when arc-extinguishing gas is sprayed with the puffer-type gas circuit breaker of FIG. It is a schematic sectional drawing which shows the state of the heat | fever puffer chamber at the time of the arc generation in the puffer type gas circuit breaker which is another Example of this invention. It is a fragmentary perspective view which shows the example of the insulation nozzle used for FIG.

  The puffer-type gas circuit breaker of the present invention includes a fixed and movable main contactor that can be contacted / separated, and a fixed and movable arc contactor that can be contacted / separated in a container filled with an arc extinguishing insulating gas, An insulating nozzle is provided so as to surround the fixed and movable arc contacts. Insulation whose pressure has increased in the arc space due to the heat of the arc formed between the fixed and movable arc contacts in the insulation nozzle when the fixed arc contact and the movable arc contact are separated. A heat puffer chamber for introducing gas, and a mechanical puffer chamber provided in series in the heat puffer chamber to increase the pressure of the insulating gas by mechanical compression are provided. An insulating gas swirl flow generating means is provided at a portion connecting the arc space portion and the heat puffer chamber.

  An embodiment of a puffer type gas circuit breaker according to the present invention will be described below with reference to FIGS. In a container (not shown) filled with an arc extinguishing insulating gas, a fixed main contact 11 and a movable main contact 12 which can be contacted / separated, and a fixed arc contact 13 and a movable arc contact which can be contacted / separated. 14 is arranged.

  The fixed arc contact 13 and the movable arc contact 14 are surrounded by an insulating nozzle 15, and the insulating nozzle 15 is fixed to the tip of the cylinder 21. The outer surface of the tip of the cylinder 21 is the movable main contact 12, and the movable arc contact 14 is fixed to the tip of the hollow rod 17 disposed in the cylinder 21.

  The outer surface of the movable arc contact 14 is covered with a mover cover 16, and a gas flow path 18 is formed between the inner surface of the insulating nozzle 15 and the mover cover 16. The cylinder 21 is partitioned by a partition wall 24 provided with a vent 25 and a check valve 26, and a heat puffer chamber 22 and a mechanical puffer chamber 23 are provided in series from the insulating nozzle 15 side.

  The heat puffer chamber 22 has a black arc generated in the arc space 19 formed between the insulating arc nozzle 15 and the fixed arc contact 13 and the movable arc contact 14 when they are separated. Insulating gas whose pressure is increased by heat is introduced. Thereafter, the insulating gas inside the thermal puffer chamber 22 flows out from the gas flow path 18 toward the insulating nozzle 15, and at the same time, the insulating gas mechanically compressed also from the mechanical puffer chamber 23 passes through the thermal puffer chamber 22. It flows to the insulating nozzle 15 side and extinguishes the arc.

  As shown in FIGS. 1 and 2, a cylindrical guide 27 is disposed in the heat puffer chamber 22. The cylindrical guide 27 is arranged coaxially with the heat puffer chamber 22 and divides the inside in the radial direction. The cylindrical guide 27 is a small width that is connected to the gas flow path 18 inside the insulating nozzle 15 and communicates with the gas space 19. The gas flow path 27A and the gas space 19 are divided into large gas spaces for introducing an insulating gas.

  A plurality of openings 28 are formed in the cylindrical guide 27 so as to extend from the gas flow path 27A toward the circumferential direction of the large gas space, as shown in FIG. Each opening 28 is formed by a circular or elliptical small hole or a narrow slit smaller than the thickness of the cylindrical guide 27. The opening direction of each opening 28 is formed with an inclination with respect to a straight line extending in the radial direction from the central axis of the cylindrical guide 27, and serves as an insulating gas swirl flow generating means.

  The opening 28 of the cylindrical guide 27 is formed so that the insulating gas can quickly flow into the gas space of the heat puffer chamber 22 through them. For this reason, considering the flow resistance determined by the width dimension of the gas flow path 27 </ b> A through which the insulating gas flows, a plurality of openings 28 are provided at substantially equal intervals in the circumferential direction of the cylindrical guide 27.

  The cylindrical guide 27 is made of, for example, an insulating material or a material similar to that of the cylinder 21, and is made of a material and a thickness that can form the opening 28 and can sufficiently withstand deformation due to inflow of high-temperature insulating gas. The cylindrical guide 27 disposed in the heat puffer chamber 22 is fixed, for example, by providing a support member (not shown) at the end of the cylindrical guide 27 on the arc space 19 side so that it can be used for a long time. To do.

  In the case where an insulator is used for the cylindrical guide 27, it may be fixed to the insulating nozzle 15 so as to be integrated, or a part of the insulating nozzle 15 is extended to the heat puffer chamber 22 side to form the cylindrical guide 27. You can also.

  Next, the operation at the time of current interruption in the puffer type gas circuit breaker having the above configuration will be described. When the hollow rod 17 is driven by an operating device (not shown), the movable arc contact 11, the insulating nozzle 15, the cylinder 21 and the like covered with the mover cover 16 are displaced toward the left side of the drawing, and the open state is reached. It becomes. At this time, as shown in FIG. 1, an arc is generated in an arc space 19 formed between the movable arc contact 14 and the fixed arc contact 13.

  The insulating gas existing in the arc space 19 becomes high temperature as the pressure rises, and as shown by the arrow in FIG. 1, the gas flow path 18 of the insulating nozzle 15 portion which is a portion communicating with the gas space 19 and the gas connected thereto. It flows through the flow path 27A into the heat puffer chamber 22 at a high speed as indicated by a thick arrow. At this time, the insulating gas directed to the heat puffer chamber 22 forms a spiral flow through the plurality of openings 28 of the cylindrical guide 27 as shown in FIG. It flows toward a large gas space.

  For this reason, the high-temperature insulating gas that has flowed into the heat puffer chamber 22 due to the spiral flow of the insulating gas through the opening 28 is sufficiently combined with the low-temperature arc-extinguishing gas existing in the large gas space of the heat puffer chamber 22. Since they are mixed, the insulating gas inside is uniformly at a relatively low temperature.

  Thereafter, when the arc contracts as shown in FIG. 3, the pressure in the arc space 19 decreases, so that the arc extinguishing gas having a relatively low temperature from the heat puffer chamber 22 is opened in the cylindrical guide 27 as indicated by a thick arrow. As shown by arrows, the gas flows through the gas flow paths 27A and 19 as shown by arrows, and sprays toward the arc at the tip of the insulating nozzle 15 to extinguish the arc.

  For this reason, when configured as the above-described puffer-type gas circuit breaker, the insulating gas in the heat puffer chamber 22 and the low-temperature insulating gas can be sufficiently mixed to uniformly reduce the temperature, so that the temperature can be relatively low. The insulation performance can be improved by spraying the insulating gas thus formed on the arc.

  Next, a puffer type gas circuit breaker which is another embodiment of the present invention will be described with reference to FIGS. 4 and 5, the same reference numerals as those in the above-described embodiment are assigned, and detailed description thereof is omitted.

  In the puffer-type gas circuit breaker shown in FIG. 4, the gas passage 18 is formed between the inner side of the insulating nozzle 15 and the mover cover 16, and also communicates between the gas space 19 and the thermal puffer chamber 22. A gas swirl flow generating means is provided. Then, when the insulating gas flows from the gas space 19 through the gas flow path 18, a swirl flow is given to the insulating gas so as to flow into the heat puffer chamber 22.

  The insulating gas swirl flow generating means is used by forming a plurality of spiral grooves 15A on the inner surface of the insulating nozzle 15 as shown in FIG. The number and depth of the spiral grooves of the insulating nozzle 15 can be arbitrarily set, and are formed on the inner surface of the insulating nozzle 15 at substantially equal intervals in the circumferential direction.

  The insulating gas swirling flow generating means is provided by providing a plurality of spiral grooves on the outer surface of the movable arc contactor cover 16 instead of providing the spiral grooves 15A on the inner surface of the insulating nozzle 15 described above. In addition, both the inner surface of the insulating nozzle 15 and the outer surface of the movable arc contactor cover 16 can be used.

  When an insulating gas swirl flow generating means is provided in the gas flow path 18 which is a part connecting the gas space 19 and the heat puffer chamber 22, the insulating gas from the gas space 19 through the gas flow path 18 to the heat puffer chamber 22 is 4, a swirl flow is created in the spiral groove 15A of the insulating nozzle 15 as indicated by a thick line arrow, flows in the gas flow path 18 and flows into the heat puffer chamber 22. For this reason, since the mixing of the low-temperature insulating gas in the heat puffer chamber 22 and the flowing-in insulating gas is promoted and the temperature becomes uniformly relatively low, the same effect as in the above example can be achieved.

  The puffer type gas circuit breaker of the present invention is not limited to the structure shown in each of the above-described embodiments, and may be implemented by appropriately changing the shape and configuration of each part without departing from the spirit of the present invention. Can do.

DESCRIPTION OF SYMBOLS 11 ... Fixed main contact, 12 ... Movable main contact, 13 ... Fixed arc contact, 14 ... Moveable arc contact, 15 ... Insulation nozzle, 15A ... Spiral groove, 16 ... Movable cover, 18, 27A ... Gas A flow path, 19 ... gas space, 21 ... cylinder, 22 ... heat puffer chamber, 23 ... mechanical puffer chamber, 27 ... cylindrical guide, 28 ... opening.

Claims (3)

  A fixed and movable main contactor that can be contacted / separated and a fixed and movable arc contactor that can be contacted / separated are disposed in a container filled with an arc extinguishing insulating gas, and the fixed and movable arc contactor are surrounded. When the fixed arc contact and the movable arc contact are separated, the arc space formed by the heat of the arc formed between the fixed and movable arc contacts in the insulating nozzle is provided. A puffer-type gas circuit breaker comprising: a heat puffer chamber for introducing an insulating gas whose pressure has increased in the section; and a mechanical puffer chamber provided in series in the heat puffer chamber to increase the pressure of the insulating gas by mechanical compression A puffer type gas circuit breaker characterized in that an insulating gas swirl generation means is provided at a portion where the arc space portion and the heat puffer chamber communicate with each other.   2. The cylinder guide according to claim 1, wherein the insulating gas swirl flow generating means is arranged in the heat puffer chamber so as to be divided into the gas flow path serving as a portion communicating with the inside and a gas space for introducing an insulating gas, and the cylinder A puffer-type gas circuit breaker comprising a guide and a plurality of openings formed so as to extend from the gas flow path toward the circumferential direction of the gas space.   2. The insulating gas swirl generating means according to claim 1, comprising a plurality of spiral grooves formed on at least one of an inner surface of the insulating nozzle or an outer surface of the movable arc contactor cover that is in contact with the gas flow path of the insulating gas. A puffer-type gas circuit breaker.

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