JP2013197010A - Gas circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a breakdown voltage performance of a gas circuit breaker, and miniaturize the gas circuit breaker.SOLUTION: A gas circuit breaker according to an embodiment has a blocking unit and a resistor unit parallely connected to each other. The blocking unit comprises a first tubular insulation container, a first stationary side electrode rod, and a first movable side electrode rod. The resistor unit comprises a second tubular insulation container, a second stationary side electrode rod, a second movable side electrode rod, and plural resistor elements. The second movable side electrode rod moves forward and backward between a forward position at which it is in contact with the opposed second stationary side electrode rod in the second insulation container, and a backward position at which it is isolated from the electrode rod. An electrode interval between the second stationary side electrode rod and the second movable side electrode rod at the backward position is within 25% of axial length of the second insulation container with a center of an axial direction of the second insulation container as a reference position.

Description

  Embodiments described herein relate generally to a gas circuit breaker.

  When an accident occurs in a power transmission system such as a power plant or a substation, the gas circuit breaker is used to quickly shut off an abnormal current generated at that time and to disconnect the accident point from the power transmission system. With the recent increase in capacity of power transmission systems, high reliability is required for gas circuit breakers for applications with a large breaking capacity.

  Therefore, as a gas circuit breaker corresponding to large-capacity power transmission, for example, a gas circuit breaker equipped with a plurality of resistor elements and equipped with a plurality of resistor elements is employed in order to suppress an input overvoltage upon power-on. A gas circuit breaker with a closing resistor is provided with a resistor unit including a closing resistor contact connected to the resistor element in parallel with the breaker unit including the main contact. Connect the making resistor contact in advance, and connect the main contact with the making overvoltage suppressed.

JP 2000-208008 A JP-A-4-209433 Japanese Patent No. 2859357

  By the way, in the above-described breaker unit and resistor unit of such a gas circuit breaker, the main contact and the closing resistor contact each constituted by a pair of electrodes are respectively accommodated in an insulating container such as a soot tube. It consists of Further, the breaker unit and the resistor unit are disposed at positions close to each other in consideration of downsizing of the entire gas breaker.

  For this reason, the above-mentioned gas circuit breaker, for example, when the electric field distribution in the resistor unit is non-uniform, arc discharge is likely to occur at the time of interruption, and not only the breakdown voltage performance of the resistor unit alone is reduced. In addition, the variation in the electric field distribution of the resistor unit may adversely affect the electric field of the adjacent interrupting unit, and the withstand voltage performance of the interrupting unit may be reduced.

  Therefore, a problem to be solved by the present invention is to provide a gas circuit breaker capable of improving withstand voltage performance and downsizing.

  The gas circuit breaker according to the embodiment includes a breaker unit and a resistor unit connected in parallel to the breaker unit. The blocking unit includes a tubular first insulating container, a first fixed-side electrode rod, and a first movable-side electrode rod. The first insulating container is provided with terminal portions at both ends to enclose an insulating gas. The 1st fixed side electrode rod is electrically connected to one terminal part in the 1st insulating container. The first movable-side electrode rod is electrically connected to the other terminal portion in the first insulating container and is in contact with the opposed first fixed-side electrode rod and the first position. It moves forward and backward between the retracted position away from the fixed electrode rod. The resistor unit includes a tubular second insulating container, a second fixed electrode rod, a second movable electrode rod, and a plurality of resistor elements. The second insulating container is provided with terminal portions at both ends to enclose an insulating gas. The second fixed electrode rod is electrically connected to one terminal portion in the second insulating container. The second movable-side electrode rod is electrically connected to the other terminal portion in the second insulating container, and is in contact with the second fixed-side electrode rod facing the second forward position and the second It moves forward and backward between the retracted position away from the fixed electrode rod. The plurality of resistor elements are electrically connected to the second fixed electrode rod or the second movable electrode rod. Here, the gap between the tip of the second fixed electrode rod and the tip of the second movable electrode rod moved to the retracted position is set with the axial center of the second insulating container as the reference position. The second insulating container is disposed at a position within 25% of the axial length of the second insulating container.

Sectional drawing which shows the structure of the principal part of the gas circuit breaker which concerns on 1st Embodiment. Sectional drawing which shows the state at the time of closing in the gas circuit breaker of FIG. Sectional drawing which shows the state at the time of opening in the gas circuit breaker of a comparative example. Sectional drawing which shows the structure of the principal part of the gas circuit breaker which concerns on 2nd Embodiment. Sectional drawing which shows the state at the time of closing in the gas circuit breaker of FIG. FIG. 5 is a detailed view of part A in FIG. 4. Sectional drawing which shows the structure of the principal part of the gas circuit breaker which concerns on 3rd Embodiment. Sectional drawing which shows the structure of the principal part of the gas circuit breaker which concerns on 4th Embodiment. Sectional drawing which shows the structure of the principal part of the gas circuit breaker which concerns on 5th Embodiment. Sectional drawing which shows the structure of the principal part of the gas circuit breaker which concerns on 6th Embodiment.

Hereinafter, embodiments will be described with reference to the drawings.
In each embodiment to be described later, in order to clarify the technical idea of each embodiment, in a so-called one-point cut type gas circuit breaker or multi-point cut (for example, two-point cut) type gas circuit breaker, The configuration of the main part for one function will be described.

[First Embodiment]
FIG. 1 shows a state at the time of opening of the gas circuit breaker 10 according to the first embodiment, and FIG. 2 shows a state at the time of closing. As shown in FIGS. 1 and 2, the gas circuit breaker 10 is a large capacity type gas circuit breaker with a closing resistance of, for example, a 550 kV class, and includes a breaker unit 1 and a resistor unit 2. Yes. The blocking unit 1 and the resistor unit 2 are electrically and mechanically connected in parallel via the conductive joining members 14 and 19 and are arranged at positions close to each other.

The blocking unit 1 includes a (first) insulating container 5, a (first) fixed electrode rod 7, and a (first) movable electrode rod 8. The insulating container 5 is configured as a tubular container to which a ceramic soot tube or the like is applied, and has electrical insulation. The hollow insulating container 5 is filled with an insulating gas 3 such as SF ₆ gas (sulfur hexafluoride gas). The insulating container 5 is provided with terminal portions 5a and 5b at both ends.

  The fixed-side electrode rod 7 is electrically connected at its proximal end to one terminal portion 5 a in the insulating container 5. One main contact 7 a is provided at the tip of the fixed electrode rod 7. The movable electrode rod 8 is electrically connected at the proximal end to the other terminal portion 5 b in the insulating container 5. Furthermore, the movable electrode rod 8 is disposed in a position facing the fixed electrode rod 7 in the insulating container 5.

  In addition, the movable electrode rod 8 has a forward position that contacts the opposed fixed electrode rod 7 as shown in FIG. 2, and a retracted position that is separated from the fixed electrode rod 7 as shown in FIG. Move forward and backward between. At the tip of the movable electrode rod 8, there is provided the other main contact 8a which is a direct contact portion and a separation portion of the tip of the fixed electrode rod 7 with respect to the main contact 7a.

  On the other hand, as shown in FIGS. 1 and 2, the resistor unit 2 includes a (second) insulating container 15, a (second) fixed-side electrode rod 17, a (second) movable-side electrode rod 18, And a plurality of resistor elements 9a and 9b. The insulating container 15 is configured as a tubular container to which, for example, a soot tube is applied, and has electrical insulation. This hollow insulating container 15 is provided with terminal portions 15a and 15b having flanges 15c and 15d for attachment at both ends, respectively, and encapsulating the insulating gas 3.

  The fixed electrode rod 17 is electrically connected to one terminal portion 15a in the insulating container 15 via a plurality of resistor elements 9a described later. One input resistance contact 17 a is provided at the tip of the fixed electrode rod 17. The movable electrode rod 18 is electrically connected to the other terminal portion 15b in the insulating container 15 via a sliding contact 12 and a plurality of resistor elements 9b described later. Further, the movable electrode rod 18 is disposed in a position facing the fixed electrode rod 17 in the insulating container 15.

  Further, as shown in FIG. 2, the movable-side electrode rod 18 has an advance position that contacts the opposing fixed-side electrode rod 17, and a retracted position that is separated from the fixed-side electrode rod 17 as shown in FIG. Move forward and backward between. At the tip of the movable electrode rod 18, there is provided the other making resistor contact 18 a which is a direct contact portion and a separated portion of the tip of the fixed electrode rod 17 with respect to the making resistor contact 17 a.

  The plurality of resistor elements 9 a and 9 b are electrically connected in series with the fixed electrode rod 17 or the movable electrode rod 18. In the present embodiment, the plurality of resistor elements 9a and 9b are divided into two sets and connected to the fixed electrode rod 17 and the movable electrode rod 18, respectively. Specifically, as shown in FIGS. 1 and 2, one set of the plurality of resistor elements 9 a is connected to the fixed-side electrode rod 17, and the other set of the plurality of resistor elements 9 b is connected to the movable side. It is connected to the electrode rod 18.

  More specifically, each of the plurality of resistor elements 9a and 9b has a ring shape in which a through hole is formed in a central portion of a disk-shaped member, for example. The fixed-side electrode rod 17 has an insulating rod portion 17b having electrical insulation at the base end side with respect to the insertion resistance contact 17a at the tip. The plurality of resistor elements 9a in one set are held in a state where the insulating rod portion 17b is inserted in the central portion. Further, the plurality of resistor elements 9a are electrically connected in series so as to be interposed between the input resistor contact 17a and the terminal portion 15a, respectively.

  On the other hand, as shown in FIG. 1 and FIG. 2, the movable electrode rod 18 has a portion connected to the proximal end side of the leading resistance contact 18a at the tip, which is composed of a conductive rod portion 18b having conductivity. . Moreover, in the movable electrode rod 18, the part joined to the base end side of the electroconductive rod part 18b is comprised by the insulating rod part 18c which has electrical insulation. The plurality of resistor elements 9b of the other set are held in a state where a clearance is provided in the center portion and the insulating rod portion 18c is inserted so as to be movable back and forth.

  Further, the conductive rod portion 18b that moves forward and backward when the movable electrode rod 18 is moved is electrically connected to the sliding contact 12 that is electrically connected to the terminal portion 15b in a sliding state or a non-sliding state. It is connected. Further, the plurality of resistor elements 9b described above are electrically connected to each other between the base end portion of the sliding contact 12 and the terminal portion 15b, which are electrically connected to the input resistance contact 18a and the conductive rod portion 18b. Connected in series.

  As shown in FIGS. 1 and 2, the gas circuit breaker 10 configured as described above first moves the movable electrode rod 18 in the resistor unit 2 to the advance position when the power is turned on, thereby fixing the fixed electrode rod. The closing resistance contact 18a at the tip of the movable electrode rod 18 is brought into contact with the closing resistance contact 17a at the tip. At this time, the input overvoltage between the main contact 7a and the main contact 8a of the interruption unit 1 is suppressed by the action of the plurality of resistor elements 9a and 9b.

  In a state where the input overvoltage is suppressed, the gas circuit breaker 10 moves the movable electrode rod 8 in the interrupting unit 1 to the forward movement position, and moves the movable electrode rod 8 with respect to the main contact 7a at the tip of the fixed electrode rod 7. The main contact 8a at the tip is brought into contact, and normal energization is started.

  On the other hand, when interrupting an abnormal current or the like, the gas circuit breaker 10 moves the movable electrode rod 8 and the movable electrode rod 18 in each unit to the retracted position as shown in FIG. Current is cut off by separating the tip of each movable electrode rod from the tip of the electrode rod.

  Here, a comparative example will be described with reference to FIG. As shown in FIG. 3, the gas circuit breaker 90 of the comparative example includes a resistor unit 92 instead of the resistor unit 2 of the present embodiment. The resistor unit 92 has a fixed electrode rod 97 longer than the fixed electrode rod 17 and a movable electrode rod 98 shorter than the movable electrode rod 18. The plurality of resistor elements 9a are disposed only on the fixed electrode rod 97 as shown in FIG.

  In a gas circuit breaker with an input resistor, the energy E injected into the entire resistor element at the time of supplying electric power is V, the power input time is T, and the total resistance value of each resistor element is R. It is given by the following formula.

E = (V ² / R) × T (Expression)

  Accordingly, when the number of resistance elements connected in series decreases, the injection energy per resistance element increases. However, since the resistor element is manufactured by setting the allowable maximum use temperature and the rated injection energy amount, the resistor element may be destroyed when the injection energy increases. For this reason, when the energy injection conditions are severe, it is necessary to increase the number of resistor elements and decrease the energy injected per resistance element.

  However, in the gas circuit breaker 90 of the comparative example, as shown in FIG. 3, a plurality of resistor elements 9 a are arranged only on the fixed electrode rod 97 in the resistor unit 92. Thus, in order to increase the number of the resistor elements 9a, it is necessary to configure the fixed electrode rod 97 to be long while the movable electrode rod 98 to be configured to be short. Therefore, as shown in FIG. The gap D between the insertion resistor contacts 17a and 18a at the rod tip is arranged at a position that is greatly deviated from the axial center C to the terminal portion 15b side in the resistor unit 92 (insulating container 15).

  Therefore, in the gas circuit breaker 90 of the comparative example, when a voltage is applied to the inter-electrode D, such as at the time of opening, the electric field distribution in the insulating container 15 in the resistor unit 92 becomes non-uniform. At this time, in the insulating container 15 of the resistor unit 92, arc discharge is likely to occur, not only causing a decrease in the withstand voltage performance of the resistor unit 92 alone, but also variation in the electric field distribution of the resistor unit 92. There is also a possibility that the electric field of the blocking units 1 arranged in the vicinity will be adversely affected, and the withstand voltage performance of the blocking unit 1 may be lowered. Therefore, making the electric field distribution uniform in the resistor unit is an important factor for ensuring the reliability of the gas circuit breaker.

  Further, in order to arrange the inter-electrode D in the center of the resistor unit 92 on the premise that the resistor element 9a is arranged only on the fixed side electrode rod 97, the insulating container 15 of the resistor unit 92 is provided. It is necessary to make it long in the axial direction. In this case, not only the manufacturing cost and the installation area increase, but also there is a concern that the stability of the operation of the gas circuit breaker 90 itself is lowered, and further, the usage amount of the insulating gas 3 is increased.

As described above, SF ₆ gas or the like is applied to the insulating gas 3 sealed in the insulating container. SF ₆ gas has extremely high physical stability, is harmless and odorless by itself, and is excellent in electrical insulation performance and arc extinguishing performance. However, the global warming potential of SF ₆ gas is 23,900 times that of carbon dioxide, which is extremely high. For this reason, SF ₆ gas is required to be suppressed to release to the atmosphere, to reduce the amount used, and to be replaced with a gas with less environmental load in the future. Therefore, it is desirable to reduce the amount of insulating gas used as much as possible.

  Therefore, as shown in FIG. 1, the gas circuit breaker 10 of the present embodiment is divided into two sets of resistor elements 9 a and 9 b in the resistor unit 2, and is movable with the fixed electrode rod 17 side. These resistor elements are arranged on both the side electrode rod 18 side. Thus, without forming the resistor unit 2 to be long in the axial direction, the resistance D is provided between the closing resistance contact 17a at the tip of the fixed electrode rod 17 and the closing resistance contact 18a at the tip of the movable electrode rod 18. It arrange | positions in the center part of the axial direction in the insulating container 15 of the body unit 2. FIG.

  More specifically, in the gas circuit breaker 10 of the present embodiment, as shown in FIG. 1, the distance D between the tip of the fixed electrode rod 17 and the tip of the movable electrode rod 18 moved to the retracted position. Is arranged at a position within 25% (L / 4) of the axial length L of the insulating container 15 with the center C of the axial length L of the insulating container 15 as a reference position.

  Here, when the gas circuit breaker is opened, when a voltage is applied to the gap D, as shown in FIG. 4, when the gap D is within a position within 25% of the length L, The inventors have confirmed by electric field calculation that the uniformity of the electric field distribution in the insulating container 15 is ensured and that the insulating container 5 is not affected.

  As described above, the gas circuit breaker 10 according to this embodiment includes a pole between the fixed electrode rod 17 and the movable electrode rod 18 at the time of opening in the resistor unit 2 as shown in FIG. By arranging the space D in the central portion of the resistor unit 2 in the axial direction, the uniformity of the electric field distribution in the insulating container 15 of the resistor unit 2 can be enhanced.

  Therefore, since the occurrence of arc discharge in the insulating container 15 of the resistor unit 2 can be suppressed when the current is opened, the withstand voltage performance of the resistor unit 2 alone can be improved. In addition, since the uniformity of the electric field distribution in the resistor unit 2 is ensured, the electric field of the resistor unit 2 is suppressed from adversely affecting the electric field of the blocking unit 1, and as a result, the blocking unit 1 Withstand voltage performance can be improved. This also reduces the risk of disposing the resistor unit 2 and the breaker unit 1 close to each other, so that the overall size of the gas breaker 10 can be reduced.

  Furthermore, since the gas circuit breaker 10 of this embodiment is divided into both the fixed electrode rod 17 side and the movable electrode rod 18 side, a plurality of resistor elements are arranged. It is possible to increase the number of applied resistor elements without configuring the unit 2 to be long in the axial direction. Thereby, since the injection energy per resistive element can be reduced, damage to the resistive element and the like can be suppressed. Further, according to the gas circuit breaker 10, as described above, the necessity to configure the resistor unit 2 to be long in the axial direction can be eliminated, so that the manufacturing cost and the installation area can be reduced, and further, the use of the insulating gas is used. It is also possible to reduce the amount.

[Second Embodiment]
Next, a second embodiment will be described with reference to FIGS. 4 and 5, the same components as those in the first embodiment shown in FIGS. 1 and 2 are given the same reference numerals, and redundant descriptions are omitted.

  As shown in FIGS. 4-6, the gas circuit breaker 20 of this embodiment is provided with the resistor unit 22 instead of the resistor unit 2 of the gas circuit breaker 10 which concerns on 1st Embodiment. In addition to the configuration of the resistor unit 2, the resistor unit 22 further includes a guide 23 that functions as a heat radiating portion and a ring 24 that functions as a bearing portion. The guide 23 is formed using a conductive material having a high thermal conductivity. The guide 23 is electrically and mechanically joined between a pair of resistor elements 9b arranged on the movable electrode rod 18 side.

  On the other hand, the ring 24 is formed in an annular shape using an electrically insulating material having high slidability. Further, the ring 24 has an outer diameter portion joined to the guide 23. In the ring 24, the insulating rod portion 18c of the movable electrode rod 18 is inserted into the central through hole with a predetermined clearance. That is, the ring 24 supports the insulating rod portion 18c of the movable electrode rod 18 so as to be slidable.

  Therefore, according to the gas circuit breaker 20 of this embodiment, the heat of the resistor element 9b generated when the power is turned on can be radiated by the guide 23. Thereby, the effect of suppressing the input overvoltage inherent in the resistor element can be surely exhibited. Further, in the gas circuit breaker 20, the advance / retreat movement by the movable electrode rod 18 can be appropriately guided through the ring 24.

[Third Embodiment]
Next, a third embodiment will be described with reference to FIG. In FIG. 7, the same constituent elements as those in the first embodiment shown in FIGS. 1 and 2 are given the same reference numerals and redundant description is omitted.

  As shown in FIG. 7, the gas circuit breaker 30 of this embodiment includes a resistor unit 32 instead of the resistor unit 2 of the gas circuit breaker 10 according to the first embodiment. The resistor unit 32 includes an accommodation space extension 35a in which the shape of the insulating container 15 in the resistor unit 2 on the one terminal portion 15a side is changed. The housing space extension 35 a is configured to extend the terminal portion 15 a to which the fixed electrode rod 17 is electrically connected without extending the main body of the insulating container 15 in the axial direction of the insulating container 15. Has been.

  Therefore, according to the gas circuit breaker 30 of the present embodiment, the gap between the fixed electrode rod 17 and the movable electrode rod 18 at the time of opening is disposed in the central portion of the resistor unit 32 in the axial direction. The number of resistor elements to be mounted can be increased while securing the configuration. Thereby, it becomes possible to reduce the injection energy per resistor element and to suppress the damage of the resistor element while maintaining the withstand voltage performance of the gas circuit breaker 30.

[Fourth Embodiment]
Next, a fourth embodiment will be described with reference to FIG. In FIG. 8, the same constituent elements as those in the first embodiment shown in FIGS. 1 and 2 are given the same reference numerals, and redundant description is omitted.

  As shown in FIG. 8, the gas circuit breaker 40 of this embodiment is provided with a resistor unit 42 instead of the resistor unit 2 of the gas circuit breaker 10 according to the first embodiment. The resistor unit 42 includes a fixed electrode rod 47 that is longer than the fixed electrode rod 17 of the first embodiment, and a movable electrode rod 48 that is shorter than the movable electrode rod 18 of the first embodiment. doing.

  Here, the resistor unit 42 of the present embodiment includes a plurality of capacitor elements 43. The plurality of capacitor elements 43 are electrically connected to the fixed side electrode rod 47 and the movable side electrode rod 48 in parallel. Further, these capacitor elements 43 are arranged in a distributed manner around the fixed side electrode rod 47 and the movable side electrode rod 48 in the insulating container 15. The resistor unit 42 may include the fixed side electrode rod 17 and the movable side electrode rod 18 of the first embodiment.

  As described above, in the gas circuit breaker 40 of the present embodiment, the plurality of capacitor elements 43 share the voltage, so that the electric field distribution in the resistor unit 42 is made uniform. The electric field on the 42 side is prevented from adversely affecting the electric field in the adjacent interrupting unit 1, and as a result, the withstand voltage performance of the gas circuit breaker itself can be improved. Further, even when the gas circuit breaker 40 is configured as, for example, a multi-point breaker (such as a two-point breaker), and it is necessary to equally share the voltage for each breaker function, Since the voltage is shared by the plurality of capacitor elements 43 in the resistor unit 42, there is no need to separately provide a capacitor unit for voltage sharing in parallel with the cutoff unit 1 and the resistor unit 42. Reduction can be achieved.

[Fifth Embodiment]
Next, a fifth embodiment will be described with reference to FIG. In FIG. 9, the same components as those in the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 9, a gas circuit breaker 50 according to this embodiment includes a circuit breaker unit 51 and a resistor unit 52 in place of the circuit breaker unit 1 and the resistor unit 2 of the gas circuit breaker 10 according to the first embodiment. I have. The resistor unit 52 includes a fixed electrode rod 47 longer than the fixed electrode rod 17 of the first embodiment and a movable electrode rod 48 shorter than the movable electrode rod 18 of the first embodiment. doing.

  On the other hand, the interruption unit 51 includes a plurality of capacitor elements 53. The plurality of capacitor elements 53 are electrically connected in parallel to the fixed side electrode rod 7 and the movable side electrode rod 8. Further, these capacitor elements 53 are arranged in a distributed manner around the fixed side electrode rod 7 and the movable side electrode rod 8 in the insulating container 5. In addition, the gas circuit breaker 50 of this embodiment may be provided with the resistor unit 2 of the first embodiment having the fixed side electrode rod 17 and the movable side electrode rod 18 instead of the resistor unit 52.

  As described above, in the gas circuit breaker 50 according to the present embodiment, the plurality of capacitor elements 53 share the voltage, so that the electric field distribution in the interruption unit 51 is made uniform. The adverse effect of the electric field on the electric field in the adjacent resistor unit 52 is suppressed, and as a result, the withstand voltage performance of the gas circuit breaker itself can be enhanced. Even when the gas circuit breaker 50 is configured as, for example, a multi-point breaker, the voltage is shared by the plurality of capacitor elements 53 in the breaker unit 51 for each point. It becomes possible to reduce the manufacturing cost.

[Sixth Embodiment]
Next, a sixth embodiment will be described based on FIG. In FIG. 10, the same components as those in the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 10, the gas circuit breaker 60 of this embodiment is provided with a resistor unit 52 in place of the resistor unit 2 of the gas circuit breaker 10 according to the first embodiment. The resistor unit 52 includes a fixed electrode rod 47 longer than the fixed electrode rod 17 of the first embodiment and a movable electrode rod 48 shorter than the movable electrode rod 18 of the first embodiment. doing.

  Further, the gas circuit breaker 60 includes a capacitor unit 63. The capacitor unit 63 is electrically connected to the (third) insulating container 65 in which the terminal portions 65a and 65b are respectively arranged at both ends, and one and the other terminal portions 65a and 65b in the insulating container 65. Capacitor element 64. Further, such a capacitor unit 63 is electrically and mechanically connected in parallel between the blocking unit 1 and the resistor unit 52 using the joining members 64 and 69. In addition, the gas circuit breaker 60 of this embodiment may be provided with the resistor unit 2 of the first embodiment instead of the resistor unit 52.

  As described above, in the gas circuit breaker 60 according to the present embodiment, the capacitor unit 63 is interposed between the breaker unit 1 and the resistor unit 52 as shown in FIG. Due to the sharing effect, the influence of the mutual electric field between the breaker unit 1 and the resistor unit 52 is reduced, and as a result, the withstand voltage performance of the gas breaker itself can be enhanced.

  Further, even when the gas circuit breaker 60 is configured as, for example, a multi-point breaker (two-point breaker type breaker), the capacitor unit 63 can equally share the voltage for each break function. Become. In addition, when the 1st-3rd gas circuit breakers 10, 20, and 30 shown in FIG.1, FIG.4, FIG.7 are comprised as a multipoint breaker, the above-mentioned capacitor unit 63 is added. May be.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

As the insulating gas 3 enclosed in the insulating units 5 and 15 of the blocking unit and the resistor unit, a gas containing at least one of oxygen, nitrogen, and carbon dioxide having a global warming potential smaller than that of the SF ₆ gas. May be applied. However, although these gases have a small influence on the environment, the electrical insulation performance is inferior to that of SF ₆ gas, and there is a concern that the insulation performance may be reduced. However, as described in each embodiment, the gas circuit breaker of each embodiment that improves the uniformity of the electric field distribution in the interruption unit and the resistor unit and improves the interruption performance, oxygen, Even if nitrogen, carbon dioxide, or the like is used as an insulating gas, it is possible to suppress environmental degradation, while improving environmental harmony.

  Alternatively, as the insulating gas 3 sealed in the insulating containers 5 and 15 of the blocking unit and the resistor unit, a neutral gas composed of gas particles containing a halogen-based element of 2 atomic molecules or more is used. It is also possible to apply.

  By using a gas containing a halogen-based element such as fluorine having a high electron affinity as the insulating gas 3, electrons accelerated by the electric field between the fixed-side electrode rod and the movable-side electrode rod in the resistor unit are halogenated. Since it disappears by adhering to the atoms, the generation time of the pre-arc discharge can be delayed. Thereby, since the thermal burden of the resistor elements 9a and 9b can be reduced, not only the number of the resistor elements 9a and 9b used can be reduced, but also the reliability of the gas circuit breaker itself as a product can be improved.

  DESCRIPTION OF SYMBOLS 1,51 ... Blocking unit, 2, 22, 32, 42, 52 ... Resistor unit, 3 ... Insulating gas, 5, 15, 65 ... Insulating container, 5a, 5b, 15a, 15b, 65a, 65b ... Terminal part 7, 17, 47... Fixed side electrode rod, 7 a, 8 a... Main contact, 8, 18, 48 ... Movable side electrode rod, 9 a, 9 b, resistor element 10, 20, 30, 40, 50, 60. Gas circuit breaker, 17a, 18a ... closing resistance contact, 23 ... guide, 24 ... ring, 35a ... accommodating space extension, 43, 53, 64 ... capacitor element, 63 ... capacitor unit, C ... axial direction of insulating container Center of length, D: Distance between fixed side electrode rod and movable side electrode rod, L: Length in the axial direction of the insulating container.

Claims (9)

A breaker unit, and a resistor unit connected in parallel to the breaker unit,
The blocking unit is
A first insulating container provided with terminal portions at both ends and filled with an insulating gas;
A first fixed-side electrode rod electrically connected to one terminal portion in the first insulating container;
From the first fixed side electrode rod and the forward position that is electrically connected to the other terminal portion in the first insulating container and is in contact with the opposing first fixed side electrode rod A first movable-side electrode rod that moves forward and backward between a retracted position and a separated position;
The resistor unit is
A second insulating container provided with terminal portions at both ends and filled with an insulating gas;
A second fixed-side electrode rod electrically connected to one terminal portion in the second insulating container;
From the second fixed side electrode rod and the forward position that is electrically connected to the other terminal portion in the second insulating container and is in contact with the opposing second fixed side electrode rod A second movable-side electrode rod that moves forward and backward between the retreat positions that are separated from each other;
A plurality of resistor elements electrically connected to the second fixed side electrode rod or the second movable side electrode rod;
The gap between the tip end of the second fixed electrode rod and the tip end of the second movable electrode rod moved to the retracted position is the axial center of the second insulating container as a reference position. As described above, the second insulating container is disposed at a position within 25% of the axial length of the second insulating container.
A gas circuit breaker characterized by that. The plurality of resistor elements are divided into two sets and connected to the second fixed-side electrode rod and the second movable-side electrode rod, respectively.
The gas circuit breaker according to claim 1. A heat dissipating part joined to the resistor element;
A bearing portion joined to the heat dissipation portion and slidably supporting the second movable electrode rod;
The gas circuit breaker according to claim 1 or 2, characterized in that. The second insulating container has a housing space configured such that one terminal portion side to which the second fixed electrode rod is electrically connected is extended in the axial direction of the second insulating container. With an extension,
The gas circuit breaker according to any one of claims 1 to 3, wherein the gas circuit breaker is provided. A breaker unit, and a resistor unit connected in parallel to the breaker unit,
The blocking unit is
A tubular first insulating container provided with terminal portions at both ends and filled with an insulating gas;
A first fixed-side electrode rod electrically connected to one terminal portion in the first insulating container;
From the first fixed side electrode rod and the forward position that is electrically connected to the other terminal portion in the first insulating container and is in contact with the opposing first fixed side electrode rod A first movable-side electrode rod that moves forward and backward between a retracted position and a separated position;
The resistor unit is
A tubular second insulating container provided with terminal portions at both ends and filled with an insulating gas;
A second fixed-side electrode rod electrically connected to one terminal portion in the second insulating container;
From the second fixed side electrode rod and the forward position that is electrically connected to the other terminal portion in the second insulating container and is in contact with the opposing second fixed side electrode rod A second movable-side electrode rod that moves forward and backward between the retreat positions that are separated from each other;
A plurality of resistor elements electrically connected to the second fixed side electrode rod or the second movable side electrode rod;
Furthermore, the resistor unit is electrically connected in parallel to the second fixed electrode rod and the second movable electrode rod, and the second fixed electrode is disposed in the second insulating container. Comprising a plurality of capacitor elements respectively distributed around the side electrode rod and the second movable side electrode rod;
A gas circuit breaker characterized by that. The blocking unit is electrically connected in parallel to the first fixed electrode rod and the first movable electrode rod, and the first fixed electrode rod in the first insulating container. And a plurality of capacitor elements respectively distributed around the first movable electrode rod.
The gas circuit breaker according to any one of claims 1 to 5, wherein the gas circuit breaker is provided. A third insulating container having terminal portions respectively disposed at both ends; a capacitor element electrically connected to one and the other terminal portions in the third insulating container; and the blocking unit and the resistor A capacitor unit connected in parallel with the body unit;
The gas circuit breaker according to any one of claims 1 to 6, wherein the gas circuit breaker is provided. The insulating gas sealed in the first and second insulating containers is a gas containing at least one of oxygen, nitrogen, and carbon dioxide.
The gas circuit breaker according to any one of claims 1 to 7, wherein the gas circuit breaker is provided. The insulating gas sealed in the first and second insulating containers is a neutral gas composed of gas particles containing a halogen-based element having two or more atomic molecules.
The gas circuit breaker according to any one of claims 1 to 7, wherein the gas circuit breaker is provided.

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