JP2013143845A - Cable head and gas insulation opening/closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable head which reduces an installation space, and a gas insulation opening/closing device.SOLUTION: First to third cable heads 1a, 1b, and 1c are cable heads that house an R-phase conductor 13a, an S-phase conductor 13b, and a T-phase conductor 13c formed by separating a three-phase conductor 13 of a bus 3, and include sealed containers 7a, 7b, and 7c which can be partially opened and are filled with insulation gas, insulation spacers 14 which are fitted to keep openings of the sealed containers 7a, 7b, and 7c airtight, and support the conductors of the bus 3, connection conductors 12 to which the conductors by the phases are connected, and electric power cable terminal parts 11 which are arranged substantially on the same plane while supporting the plurality of connection conductors 12, and connected to electric power cables 10 led out of the sealed containers 7a, 7b, and 7c.

Description

  Embodiments described herein relate generally to a cable head and a gas insulated switchgear.

  In general, a gas-insulated switchgear can be made significantly smaller than an air-insulated switchgear. For this reason, it is widespread in urban areas where the installation space tends to be insufficient. In addition, in gas insulated switchgear installed in the city center, a power cable connection system using a cable head is often adopted for the purpose of reducing the air insulation distance of the connection part to other equipment such as a power transmission network and a transformer. Yes. Further, in a large capacity line with a large rated current, the power cable may be divided into a plurality of strips and connected to a large number of cable heads in order to increase the working efficiency when laying the power cable.

  In a three-phase collective gas-insulated switchgear using a power cable connection system in a large-capacity line, the three-phase conductor extends straight from the gas-insulated equipment and passes through the insulating spacer, and the power cable in the cable head Each phase of the three-phase conductor led out to the upper end of the terminal and connected to the connection conductor is arranged on the same vertical plane as each of the power cable end sections, and one side of the three-phase conductor is a positive direction in the vertical direction. The arrangement of passing through each vertex of the triangle is disclosed.

JP 2003-289605 A

  In the above-described cable head and gas insulated switchgear, when connecting a plurality of power cables in a large capacity line to the cable head of the gas insulated switchgear, a large number of cable heads are required, and as the number of cable heads increases, The installation area (installation space) of the entire insulated switchgear increases. In addition to a number of cable heads, devices such as disconnectors, instrument transformers, and lightning arresters may be connected. For this reason, the installation area of the whole gas insulated switchgear including these becomes large.

  The problem to be solved by the present invention is to provide a cable head and a gas insulated switchgear that reduce installation space.

  In order to solve the above problems, a cable head according to one embodiment is a cable head in which a three-phase conductor of a power cable connection bus is separated for each phase and a plurality of in-phase conductors are accommodated for each separated phase. . The cable head includes a sealed container that can be partially opened and filled with an insulating gas, and an insulating spacer that is attached so as to be kept airtight at the opening of the sealed container and supports a conductor of the power cable connecting bus. A connection conductor to which a conductor in the same phase as any one of the three-phase conductors is connected in the sealed container, and a plurality of in-phase connections connected to be kept airtight in the other opening of the sealed container A power cable termination portion that is disposed on substantially the same plane while supporting the conductor and is connected to a power cable led out from the outside of the sealed container.

  The cable head according to another embodiment is a cable head in which the three-phase conductors of the power cable connection bus are separated for each phase, and a plurality of in-phase conductors are accommodated for each separated phase. The cable head includes a main body portion that is partially openable and accommodates a three-phase conductor of the power cable connection bus, and a first phase housing a plurality of conductors of a first phase in the three-phase conductor of the power cable connection bus. A first branching section, a second branching section that accommodates a plurality of second phase conductors in the three-phase conductor of the power cable connection bus, and a plurality of third phases in the three-phase conductor of the power cable connection bus A sealed container filled with an insulating gas having a third branch portion that accommodates a conductor of the first and second conductors, and is attached so as to be kept airtight at the opening of the main trunk, and supports the conductor of the power cable connection bus An insulating spacer, a connection conductor to which the three-phase conductor is connected in the sealed container, and each of the first to third branch portions are attached so as to maintain the hermeticity of the sealed container. Of the connecting conductor And a power cable terminal portion that is arranged on substantially the same plane and supports the power cable that is led out from the outside of the sealed container.

  In order to solve the above problem, in the gas insulated switchgear according to one embodiment, the three-phase conductors of the power cable connection bus are separated for each phase, and a plurality of in-phase conductors are accommodated for each separated phase. A gas insulated switchgear comprising a plurality of cable heads. The gas-insulated switchgear accommodates a three-phase conductor of the power cable connection bus, leads the three-phase conductor to the plurality of cable heads, each of the plurality of cable heads can be partially opened, Any one of a sealed container filled with an insulating gas, an insulating spacer that is attached so as to be kept airtight at the opening of the sealed container, and supports a conductor of the power cable connection bus, and the three-phase conductor in the sealed container. Or a connection conductor to which a single-phase in-phase conductor is connected, and is attached so as to be kept airtight at the other opening of the sealed container, and arranged on substantially the same plane while supporting a plurality of the in-phase connection conductors. A power cable terminal portion connected to a power cable led out from the outside of the sealed container, and the plurality of cable heads accommodate a first phase of a three-phase conductor of the power cable connection bus A first cable head, a second cable head that houses a second phase of the three-phase conductor of the power cable connection bus, and a third cable that houses a third phase of the three-phase conductor of the power cable connection bus. The cable heads are connected so as to be aligned in a row in a horizontal direction from which the three-phase conductor is led out with the insulating spacer interposed therebetween, and the first cable head is connected to the first cable head. Supporting the three-phase conductor of the power cable connecting bus via the insulating spacer of the cable head, passing the second and third phase conductors to the insulating spacer of the second cable head, and The head supports the second and third phase conductors via the insulating spacer of the second cable head to the insulating spacer of the third cable head. Passed through a conductor the third phase, the third cable head, for supporting the third conductors of the phases through the insulating spacer of the third cable head.

  The gas insulated switchgear according to another embodiment includes a gas insulated switchgear having a cable head in which a three-phase conductor of a power cable connection bus is separated for each phase and a plurality of in-phase conductors are accommodated for each separated phase. Device. The gas-insulated switchgear accommodates a three-phase conductor of the power cable connection bus and leads the three-phase conductor to the cable head. The cable head can be partially opened, and the three-phase conductor of the power cable connection bus can be opened. A main trunk portion accommodating a phase conductor; a first branch portion accommodating a plurality of first phase conductors in the three-phase conductor of the power cable connection bus; and a second branch in the three-phase conductor of the power cable connection bus. An insulating gas comprising: a second branch portion that accommodates a plurality of conductors of a second phase; and a third branch portion that accommodates a plurality of conductors of a third phase in the three-phase conductor of the power cable connection bus. A sealed container filled, an insulating spacer that is attached so as to be kept airtight at the opening of the main body, and that supports a conductor of a power cable connection bus; and a connection in which the three-phase conductor is connected in the sealed container A conductor and said It is connected to the first to third branch portions, and is attached to each of the first to third branch portions so as to keep the hermetic container hermetic, and is substantially the same while supporting a plurality of in-phase connection conductors. A power cable termination portion arranged on a plane and connected to a power cable led out from the outside of the sealed container.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a vertical sectional view of a first embodiment of a gas insulated switchgear according to the present invention. The top view of FIG. FIG. 3 is an elevational sectional view of the cable head according to the first embodiment. FIG. 4 is a transverse cross-sectional view taken along line IV-IV in FIG. 3. FIG. 5 is a transverse cross-sectional view taken along line VV in FIG. 3. The elevation sectional view in a 2nd embodiment of the gas insulation switchgear concerning the present invention. The sectional elevation in the 3rd embodiment of the gas insulation switchgear concerning the present invention. The sectional elevation in the 4th embodiment of the gas insulation switchgear concerning the present invention. The sectional elevation in the 5th embodiment of the gas insulation switchgear concerning the present invention.

  Hereinafter, a cable head and a gas insulated switchgear according to embodiments of the present invention will be specifically described with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted. Each of the following embodiments described here will be described by taking an example of a gas insulated switchgear.

[First Embodiment]
Hereinafter, a first embodiment of a gas insulated switchgear according to the present invention will be described with reference to FIGS. Here, FIG. 1 is a vertical sectional view of the gas insulated switchgear according to the first embodiment of the gas insulated switchgear according to the present invention, and FIG. 2 is a top view of FIG. 3 to 5 are diagrams for explaining the cable head used in FIG. 1. FIG. 3 is a vertical sectional view of the cable head, and FIG. 4 is a transverse sectional view taken along line IV-IV in FIG. 5 is a cross-sectional view taken along line VV in FIG.

  As shown in FIG. 1, the gas insulated switchgear according to the first embodiment includes first to third cable heads 1 a, 1 b and 1 c, a disconnector 2, a bus bar 3, an instrument transformer 5, and a lightning arrester 6. doing.

  In FIG. 1, the first to third cable heads 1a, 1b and 1c have terminations for connecting the conductors of the lines accommodated in the gas insulated switchgear to the conductors and cables outside the gas insulated switchgear. Do. The disconnector 2 opens and closes a circuit from a charged conductor or the like. The bus bar 3 includes a conductor of the energization part, a container that accommodates them, and a support insulator (insulating spacer). The instrument transformer 5 has a terminal for transforming the high voltage of the circuit into a low voltage and connecting the transformed voltage to the instrument. The lightning arrester 6 protects the gas-insulated switchgear from lightning surges and switching surges generated in the power system. These devices are sealed with an insulating gas sealed in a container.

  In the gas insulated switchgear shown in FIG. 1, the disconnector 2 is disposed horizontally, and the busbar 3 is connected to the disconnector 2 horizontally. Further, the lightning arrester 6 is arranged downward in the vertical direction, the bus bar 3 is connected to the lightning arrester 6 downward, and the instrument transformer 5 is arranged upward in the vertical direction. The bus 3 is connected upward. Further, as shown in FIGS. 1 and 2, the first to third cable heads 1a, 1b and 1c are connected in the horizontal direction. The conductors for each of the R phase, the S phase, and the T phase are connected to the power cable 10 via the first to third cable heads 1a, 1b, and 1c.

  Hereinafter, a method of accommodating the three-phase conductor 13 of the bus 3 (power cable connection bus) in the first to third cable heads 1a, 1b and 1c will be described.

  In the gas-insulated switchgear according to the first embodiment, the three-phase conductors 13 accommodated in the container of the bus 3 are each of the R-phase conductor 13a, the S-phase conductor 13b, and the T-phase conductor 13c in the bus 3. Have been separated. For example, in FIG. 1, the R-phase conductor 13a is obtained by separating the three R-phase conductors from the bus 3, and the other S-phase conductor 13b and T-phase conductor 13c are also separated from the bus 3. Three S-phase and T-phase conductors are separated from each other. In the gas insulated switchgear shown in FIG. 1, the conductors for each phase separated by the bus bar 3 are led out to the first to third cable heads 1a, 1b and 1c.

  In the plurality of cable heads, the first cable head 1 a accommodates three R-phase conductors 13 a of the three-phase conductor 13, and the second cable head 1 b includes three S-phase conductors 13 b of the three-phase conductor 13. The third cable head 1 c accommodates three strips of the T-phase conductor 13 c of the three-phase conductor 13. As shown in FIG. 1, the first to third cable heads 1 a, 1 b, and 1 c are connected so as to be arranged in a row in the horizontal direction in which the three-phase conductor 13 is led out with an insulating spacer 14 interposed therebetween.

  The first cable head 1a supports the R-phase, S-phase, and T-phase conductors 13a, 13b, and 13c of the bus 3 by the insulating spacer 14, and the S-phase and T-phase up to the insulating spacer 14 of the second cable head 1b. Conductors 13b and 13c. Next, the second cable head 1b supports the S-phase and T-phase conductors 13b and 13c by the insulating spacer 14, and passes the T-phase conductor 13c to the insulating spacer 14 of the third cable head 1c. . Finally, the third cable head 1 c supports the T-phase conductor 13 c by the insulating spacer 14.

  As shown in FIG. 1, the first cable head 1a includes a sealed container 7a, a power cable terminal portion 11, a connection conductor 12, an insulating spacer 14, and a first power cable connection portion 15a. Further, the second and third cable heads 1b and 1c have the same configuration as that of the first cable head 1a as shown in FIG. Hereinafter, the first cable head 1a will be mainly described, but the same applies to the other second and third cable heads 1b and 1c, and thus the description thereof will be omitted.

  A part of the sealed container 7a of the first cable head 1a can be opened and filled with an insulating gas.

  The insulating spacer 14 is attached so as to be kept airtight at the opening of the sealed container 7a for allowing the conductor to pass therethrough, and supports the conductors 13a, 13b and 13c led out from the bus bar 3. The insulating spacer 14 interposed between the sealed container 7a and the sealed container 7b supports the conductors 13b and 13c.

  A predetermined one-phase conductor (for example, an R-phase conductor 13a) of the three-phase conductor 13 is connected to the connection conductor 12 in the sealed container 7a. That is, the conductors of each phase accommodated in each cable head are connected.

  The power cable terminal portion 11 is attached so as to be kept airtight at another opening for terminating the power cable 10 in the sealed container 7a. The power cable terminal portion 11 is arranged on substantially the same plane while supporting the plurality of R-phase connection conductors 12 and connects the connection conductors 12 to the power cable 10 drawn from the outside of the sealed container 7a.

  The first power cable connecting portion 15a accommodates the power cable 10 led out from the lower direction (the ground side) and supports the first cable head 1a from the lower direction. The detailed structure of the first to third power cable connecting portions 15a, 15b and 15c will be described with reference to FIGS.

  Hereinafter, the connection between the power cable 10 and the first to third cable heads 1a, 1b, and 1c accommodating a plurality of R-phase, S-phase, and T-phase conductors will be described. Specifically, the first to third cable heads 1a, 1b and 1c in the gas insulated switchgear shown in FIG. 1 will be described with reference to FIGS. 3 to 5 are diagrams showing the third cable head 1c shown in FIG. 1 as an example, and the basic configurations of the other first and second cable heads 1a and 1b are the same. is there.

  As shown in FIGS. 3 and 4, the T-phase conductor 13c is supported through the insulating spacer 14 of the third cable head 1c. The T-phase conductor 13c is divided into three in the sealed container 7c of the third cable head 1c, and each of them is connected to the connection conductor 12. The connection conductor 12 is accommodated in the power cable terminal portion 11. As a result, the T-phase conductor 13c is connected to the T-phase power cable 10 drawn from the outside of the hermetic container 7c via the power cable terminal portion 11 and the third power cable connection portion 15c.

  Further, as shown in FIGS. 3 to 5, three truncated cone-shaped power cable terminal portions 11 are arranged substantially equally in a triangle on the cable head bottom plate 151c in the third power cable connecting portion 15c. That is, each power cable terminal portion 11 is located at each vertex of an equilateral triangle when viewed from above. A connection conductor 12 is attached to the upper side (upward) of each power cable terminal portion 11 in the vertical direction.

  As shown in FIGS. 3 to 5, the third power cable connecting portion 15c includes a cable head bottom plate 151c, an adapter 152c, and a frame 153c.

  The cable head bottom plate 151c covers the opening on the side where the power cable 10 is accommodated in the sealed container 7c. The cable head bottom plate 151c is provided so that the power cable terminal portion 11 penetrates. In the power cable terminal portion 11, the connection conductor 12 and the T-phase power cable 10 drawn from the outside of the sealed container 7c are connected.

  The adapter 152c is attached so as to maintain airtightness for each power cable end portion 11 in order to prevent leakage of insulating gas from the power cable end portion 11 penetrating the cable head bottom plate 151c.

  The frame 153c accommodates the T-phase power cable 10 led out from below and supports the third cable head 1c from below.

  The cable distance Xk between the power cable terminations 11 shown in FIG. 5 is that the conductors accommodated in the power cable terminations 11 are in the same phase, so that the power cable terminations compared to the cable head when accommodating different phases. It can be made smaller than the cable distance between them. Thereby, the tank diameter Dk shown in FIG. 5 can make the tank diameter of a power cable terminal part smaller than the cable head at the time of accommodating a different phase. Further, the cable head bottom plate 151c can be made smaller accordingly.

  According to the first to third cable heads 1a, 1b, and 1c in the first embodiment, the three-phase conductors of the bus are separated for each line, and the separated R phase and S phase are separated into each cable head. And T-phase conductors can be assigned. Each cable head can accommodate multiple conductors of each assigned phase.

  The power cable termination unit 11 accommodates the plurality of conductors 13a, 13b, and 13c and connects to the power cable 10 as described above for each of the R phase, S phase, and T phase of the three-phase conductor 13. . 1 to 5 show an example in which three conductors are accommodated as a plurality of conductors. However, in the cable head of this embodiment, the accommodation number is not limited to three. Absent. A plurality of conductors may be accommodated by using a plurality of cable heads that accommodate a plurality of strips.

  According to the first embodiment, for each of the first to third cable heads 1a, 1b, and 1c, by accommodating a conductor for each phase, the potential difference between the phases can be eliminated in the cable head. The tank diameter of the head can be reduced. Thereby, since the gas insulated switchgear including the first to third cable heads 1a, 1b and 1c can reduce the size of the cable head, the installation area of the entire GIS (Gas Insulated Switchgear) can be reduced.

  Further, as shown in FIG. 1, for example, by disposing the instrument transformer 5 on the top of the lightning arrester 6, the installation area of the entire GIS can be further reduced.

[Second Embodiment]
FIG. 6 is an elevational sectional view of a gas insulated switchgear according to a second embodiment of the present invention.

  In the gas insulated switchgear according to the second embodiment, the three-phase conductor 13 of the power cable connection bus (bus 3) is separated for each phase, and the cable head 1d that accommodates a plurality of in-phase conductors for each separated phase is provided. It has. For example, as shown in FIG. 6, the gas insulated switchgear according to the second embodiment includes a cable head 1 d, a disconnector 2, a bus 3, an instrument transformer 5, and a lightning arrester 6.

  In the gas insulated switchgear according to the second embodiment, as shown in FIG. 6, the disconnector 2 is disposed horizontally, and the busbar 3 is connected to the disconnector 2 horizontally. The bus bar 3 has a lightning arrester 6 disposed downward in the vertical direction and an instrument transformer 5 disposed upward in the vertical direction. A cable head 1d is arranged in the horizontal direction.

  In the gas insulated switchgear according to the second embodiment, as in the first embodiment, the three-phase conductors 13 accommodated in the bus 3 are the R-phase conductor 13a, the S-phase conductor 13b, and the T-phase conductor. Each phase of 13c is separated. For example, in FIG. 6, the R-phase conductor 13 a is obtained by separating the three R-phase conductors from the bus 3, and the other S-phase conductor 13 b and T-phase conductor 13 c are also connected to the bus 3. The three S-phase and T-phase conductors are separated. In the gas insulated switchgear shown in FIG. 6, the conductors 13a, 13b and 13c for each phase separated by the bus bar 3 are led out to the cable head 1d.

  The cable head 1d accommodates the R-phase, S-phase, and T-phase conductors 13a, 13b, and 13c of the three-phase conductor 13 separated as described above. The cable head 1d has a main trunk portion 7d that is partially openable and accommodates the three-phase conductor 13, and a first branch portion 8a that accommodates a plurality of (for example, three) R-phase conductors 13a of the three-phase conductor 13. And a second branch portion 8b that accommodates a plurality of S-phase conductors 13b of the three-phase conductor 13, and a third branch portion 8c that accommodates a plurality of T-phase conductors 13c of the three-phase conductor 13. . In addition, the cable head 1d has a power cable terminal portion 11, a connection conductor 12, an insulating spacer 14, and a power cable connection portion 15d.

  The cable head 1d is formed so that the main body portion 7d and the first to third branch portions 8a, 8b and 8c are integrated so as to be filled with an insulating gas. As described above, the cable head 1d has a smaller opening than in the case of using the first to third cable heads 1a, 1b, and 1c in the first embodiment shown in FIG.

  The insulating spacer 14 supports the R-phase conductor 13a, the S-phase conductor 13b, and the T-phase conductor 13c led out from the bus bar 3 at the opening of the main body 7d, and is attached so as to maintain airtightness.

  The connection conductor 12 is connected to a conductor for each phase corresponding to each phase of the three-phase conductor 13 in the first to third branch portions 8a, 8b and 8c. That is, the separated R-phase conductor 13a, S-phase conductor 13b, and T-phase conductor 13c are connected to the connecting conductors 12 in the first to third branch portions 8a, 8b, and 8c for each of the plurality of in-phase conductors. It is connected to the.

  In the power cable terminal portion 11, the connection conductor 12 and the power cable 10 are connected to each of the first to third branch portions 8a, 8b, and 8c. In this case, in each of the first to third branch portions 8a, 8b, and 8c, the power cable termination portion 11 is disposed on substantially the same plane and connected to the power cable drawn from the outside of the cable head 1d. Yes. Further, the power cable terminal portion 11 is attached so as to maintain the airtightness of the cable head 1d.

  The power cable connection portion 15 d accommodates the power cable termination portion 11 and accommodates the power cable 10. For this purpose, the power cable connecting portion 15d has a cable head bottom plate 151d, a frame 153d, and an adapter (not shown) as shown in FIG.

  The cable head bottom plate 151d is provided so that the power cable terminal portion 11 penetrates, and covers the openings of the first to third branch portions 8a, 8b and 8c. For example, in the first branch portion 8a, the power cable terminal portion 11 provided so as to penetrate the cable head bottom plate 151d is connected to the R-phase power cable 10 drawn from the outside of the power cable connection portion 15d, and R The connection conductor 12 connected to the plurality of conductors 13a of the phase is connected.

  The adapter provided in the cable head bottom plate 151d prevents the insulating gas from leaking from the power cable terminal portion 11 provided so as to penetrate the cable head bottom plate 151d. This adapter is attached so as to cover a gap around the through-hole of the power cable terminal portion 11 in the cable head bottom plate 151d, and keeps the cable head 1d airtight. Although not shown, the adapter is provided in the same manner as the adapter 152c shown in FIG.

  The frame 153d accommodates the R-phase, S-phase, and T-phase power cables 10 led from the lower direction (ground side) and supports the cable head 1d from the ground side.

  In FIG. 6, for example, a cable head bottom plate 151d is attached so as to cover the opening of the first branch portion 8a. In the cable head bottom plate 151d, three power cable terminal portions 11 formed in a truncated cone shape are arranged substantially equally in a triangular shape. Each power cable terminal portion 11 is located at each vertex of an equilateral triangle, for example, as viewed from above, as in the example shown in FIG. A connection conductor 12 is attached to the upper side (upward) of each power cable terminal portion 11 in the vertical direction. The same applies to the openings of the other second branch portion 8b and third branch portion 8c.

In the gas insulated switchgear, in addition to reducing the installation space of the GIS described above, SF ₆ gas, which is an insulating gas, has a high global warming potential. There is a demand for a structure or configuration that reduces gas leakage and prevents gas leakage. There is also a need to reduce manufacturing costs by reducing the number of parts by reducing flanges, seals, and the like.

  From the above viewpoint, in the second embodiment, the three-phase conductors 13 accommodated in the three cable heads are configured to be accommodated in one cable head 1d as shown in FIG. Thereby, in addition to the effect of 1st Embodiment, in 2nd Embodiment, the number of insulation spacers, flanges, and seals can be reduced as a whole as compared with the case where three individual cable heads are used. As a result, there is an effect of reducing the risk of gas leakage and reducing the manufacturing cost by reducing the number of parts.

[Third Embodiment]
FIG. 7 is an elevational sectional view of a third embodiment of the gas insulated switchgear according to the present invention. The third embodiment is a modification of the second embodiment. Hereinafter, differences from the second embodiment will be mainly described.

  In the gas insulated switchgear according to the third embodiment, the three-phase conductor 13 of the bus bar 3 is separated for each phase as in the second embodiment, and the cable head 1e that accommodates a plurality of conductors for each separated phase is provided. It has. For example, the gas-insulated switchgear according to the third embodiment includes a cable head 1e, a disconnector 2, a bus 3, an instrument transformer 5, and a lightning arrester 6 as shown in FIG.

  In the gas insulated switchgear according to the third embodiment, as shown in FIG. 7, the disconnector 2 is disposed horizontally, and the busbar 3 is connected to the disconnector 2 horizontally. The bus bar 3 has a lightning arrester 6 disposed downward in the vertical direction and an instrument transformer 5 disposed upward in the vertical direction. A cable head 1e is arranged in the horizontal direction. The conductors 13a, 13b and 13c for each phase separated by the bus bar 3 are led to the cable head 1e.

  In the cable head 1e, a plurality of (for example, three) conductors of the R phase, S phase, and T phase of the three-phase conductor 13 are accommodated. The cable head 1e includes a main trunk portion 7e that is partially openable and accommodates a three-phase conductor 13, a first branch portion 8e that accommodates a plurality of R-phase conductors 13a in the three-phase conductor 13, and an S-phase. The second branch portion 8f that accommodates the plurality of conductors 13b and the third branch portion 8g that similarly accommodates the plurality of T-phase conductors 13c. In addition, the cable head 1e has a power cable terminal portion 11, a connection conductor 12, an insulating spacer 14, and first to third power cable connection portions 15e, 15f, and 15g.

  In the cable head 1e, the main body portion 7e and the first to third branch portions 8e, 8f and 8g are integrally formed so as to be filled with an insulating gas. As described above, the cable head 1e is formed so as to have a smaller number of openings, similarly to the cable head 1d shown in FIG.

  The insulating spacer 14 supports the R-phase conductor 13a, the S-phase conductor 13b, and the T-phase conductor 13c led out from the bus bar 3 at the opening of the main body 7e, and is attached so as to maintain airtightness.

  In the cable head 1e, as shown in FIG. 7, the 1st branch part 8e is arrange | positioned downward, and the R-phase power cable 10 is accommodated in the 1st power cable connection part 15e. Further, the second and third branch portions 8f and 8g are arranged in the horizontal direction, and the S-phase and T-phase power cables 10 are accommodated by the second and third power cable connection portions 15f and 15g. As shown in FIG. 7, the first power cable connecting portion 15e has a cable head bottom plate 151e and a frame 153e, and the second and third power cable connecting portions 15f and 15g are connected to the cable head bottom plate 151f and the cable head bottom plate 151f. Although it has a cable head bottom plate 151g, it does not have a frame.

  In the third embodiment, as in the second embodiment, the three-phase conductors 13 accommodated in the three cable heads are accommodated by the single cable head 1e, so that the individual three cable heads are used. As a whole, the number of insulating spacers, flanges, and seals can be reduced as compared with the case of using. For this reason, it has effects, such as reduction of manufacturing cost and gas leakage risk, by reducing the number of parts.

  Further, in the third embodiment, in the cable head 1e, the first and second branch parts 8f and 8g are arranged in the horizontal direction only by arranging the first branch part 8e downward. Compared with the second embodiment, the installation area of the entire GIS can be further reduced.

[Fourth Embodiment]
FIG. 8 is an elevational sectional view of a gas insulated switchgear according to a fourth embodiment of the present invention. The fourth embodiment is a modification of the second embodiment. Hereinafter, differences from the second and third embodiments will be mainly described.

  In the gas insulated switchgear according to the fourth embodiment, the three-phase conductor 13 of the bus bar 3 is separated for each phase as in the second embodiment, and the cable head 1h that accommodates a plurality of conductors for each separated phase. It comprises. For example, the gas insulated switchgear according to the fourth embodiment includes a cable head 1h, a disconnector 2, a busbar 3, an instrument transformer 5, and a lightning arrester 6 as shown in FIG.

  In the cable head 1h, a plurality of (for example, three) conductors of the R phase, S phase, and T phase of the three-phase conductor 13 are accommodated. The cable head 1h includes a main body portion 7h that can be partially opened and accommodates the three-phase conductor 13, a first branch portion 8h that accommodates a plurality of R-phase conductors 13a in the three-phase conductor 13, and an S-phase. The second branch portion 8i that accommodates the plurality of conductors 13b and the third branch portion 8j that similarly accommodates the plurality of T-phase conductors 13c. In addition, the cable head 1h has a power cable terminal portion 11, a connection conductor 12, an insulating spacer 14, and first to third power cable connection portions 15h, 15i, and 15j.

  The cable body 1h is formed so that the main body portion 7h and the first to third branch portions 8h, 8i, and 8j are integrated so as to be filled with an insulating gas. As described above, the cable head 1h is formed so as to have a smaller number of openings, similarly to the cable head 1e shown in FIG. As shown in FIG. 8, the first power cable connecting portion 151h has a cable head bottom plate 151h and a frame 153h, and the second and third power cable connecting portions 15i and 15j are cable head bottom plate 151i and Although it has a cable head bottom plate 151j, it does not have a frame.

  In the fourth embodiment, as in the third embodiment, the three-phase conductors 13 accommodated in the three cable heads are accommodated in one cable head 1h. As a whole, the number of insulating spacers, flanges, and seals can be reduced as compared with the case of using.

  In the fourth embodiment, in the cable head 1h, the first branch portion 8h is disposed downward, the second branch portion 8i is disposed in the horizontal direction, and the third branch portion 8j is disposed upward. doing. Further, corresponding to the first to third branch portions 8h, 8i and 8j, the R-phase power cable 10 is accommodated in the first power cable connection portion 15h disposed downward and disposed in the horizontal direction. The S-phase power cable 10 is accommodated in the second power cable connection portion 15i, and the T-phase power cable 10 is accommodated in the third power cable connection portion 15j disposed upward. Thereby, compared with 3rd Embodiment, the branch part of a horizontal direction is reduced by one place, Furthermore, the number of the flange and seal | sticker for this can be reduced.

  As described above, in the fourth embodiment, the manufacturing cost can be reduced by reducing the number of components, and there are effects such as the reduction of locations having a risk of gas leakage.

  In the fourth embodiment, in the cable head 1h, the first branch portion 8h is disposed downward, the second branch portion 8i is disposed in the horizontal direction, and the third branch portion 8j is disposed upward. Therefore, the installation area of the entire GIS can be further reduced as compared with the case of the second embodiment.

[Fifth Embodiment]
FIG. 9 is an elevational sectional view of a gas insulated switchgear according to a fifth embodiment of the present invention. The fifth embodiment is a modification of the first embodiment. Hereinafter, differences from the first embodiment will be mainly described.

  In the fifth embodiment, the configuration is the same as that of the first embodiment. However, the difference is that the instrument transformer 5 is arranged on the upper part of the first cable head 1a, and the lightning arrester 6 is connected to the second cable head. It is the point arrange | positioned at the upper part of 1b. The instrument transformer 5 and the lightning arrester 6 are connected to the three-phase conductor 13 via the first cable head 1a and the second cable head 1b. In order to connect the three-phase conductor 13 to the lightning arrester 6, the insulating spacer 14 in the second cable head 1b also supports the R-phase conductor 13a in addition to the S-phase conductor 13b and the T-phase conductor 13c. ing.

  As described above, with the arrangement shown in FIG. 9, the installation area of the gas insulated switchgear can be reduced by the installation area of the lightning arrester 6 as compared with the installation area shown in FIG.

  Therefore, the fifth embodiment has an effect that the installation area of the entire GIS can be further reduced as compared with the case of the first embodiment.

[Other Embodiments]
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. For example, the present invention can be applied to a power system having a similar device other than the gas insulated switchgear. Moreover, you may combine the characteristic of each embodiment. Furthermore, these embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

  DESCRIPTION OF SYMBOLS 1a ... 1st cable head, 1b ... 2nd cable head, 1c ... 3rd cable head, 1d, 1e, 1h ... Cable head, 2 ... Disconnector, 3 ... Busbar, 5 ... Instrument transformer, 6 ... Arrester, 7a, 7b, 7c ... Airtight container, 7d, 7e, 7h ... Main trunk, 8a, 8e, 8h ... First branch, 8b, 8f, 8i ... Second branch, 8c, 8g, 8j ... third branch portion, 10 ... power cable, 11 ... power cable termination, 12 ... connection conductor, 13 ... three-phase conductor, 13a ... R-phase conductor, 13b ... S-phase conductor, 13c ... T-phase Conductor, 14 ... insulating spacer, 15a, 15e, 15h ... first power cable connection, 15b, 15f, 15i ... second power cable connection, 15c, 15g, 15j ... third power cable connection, 15d ... Power cable connection part, 151c, 51d, 151e, 151f, 151g, 151h, 151i, 151j ... cable head bottom plate, 152c ... adapter, 153c, 153d, 153e, 153h ... Frames

Claims (7)

A cable head in which a three-phase conductor of a power cable connection bus is separated for each phase, and a plurality of in-phase conductors are accommodated for each separated phase,
A sealed container partially openable and filled with insulating gas;
An insulating spacer that is attached so as to be kept airtight at the opening of the sealed container and supports a conductor of the power cable connection bus; and
A connection conductor to which a conductor in phase with any one of the three-phase conductors is connected in the sealed container;
It is attached so as to be kept airtight at the other opening of the sealed container, and is arranged on substantially the same plane while supporting a plurality of the connection conductors of the same phase, and is connected to the power cable led out from the outside of the sealed container. A power cable termination,
A cable head comprising: A cable head in which a three-phase conductor of a power cable connection bus is separated for each phase, and a plurality of in-phase conductors are accommodated for each separated phase,
A main trunk portion that is partially openable and accommodates a three-phase conductor of the power cable connection bus; and a first branch portion that accommodates a plurality of first phase conductors in the three-phase conductor of the power cable connection bus A second branch portion for accommodating a plurality of conductors of the second phase in the three-phase conductor of the power cable connection bus; and a plurality of conductors of the third phase in the three-phase conductor of the power cable connection bus. A hermetically sealed container filled with an insulating gas having a third branch part;
An insulating spacer that is attached so as to maintain airtightness at the opening of the main body, and supports a conductor of a power cable connection bus;
A connection conductor to which the three-phase conductor is connected in the sealed container;
Each of the first to third branch portions is attached so as to maintain the hermeticity of the hermetic container, and is arranged on substantially the same plane while supporting the plurality of in-phase connection conductors. A power cable termination connected to the power cable derived from
A cable head comprising: The cable head according to claim 2, wherein the first to third branch parts and the power cable terminal part are connected. The first and second branch portions are provided so as to be arranged in a horizontal direction,
The cable head according to claim 2, wherein the third branch portion is provided so as to be disposed downward. The first branch portion is provided so as to be arranged upward;
The second branch part is provided to be arranged in a horizontal direction;
The cable head according to claim 2, wherein the third branch portion is provided so as to be disposed downward. A gas-insulated switchgear comprising a plurality of cable heads in which a three-phase conductor of a power cable connection bus is separated for each phase and a plurality of in-phase conductors are accommodated for each separated phase;
The gas insulated switchgear accommodates a three-phase conductor of the power cable connection bus, and leads the three-phase conductor to the plurality of cable heads.
Each of the plurality of cable heads is
A sealed container partially openable and filled with insulating gas;
An insulating spacer that is attached so as to be kept airtight at the opening of the sealed container and supports a conductor of the power cable connection bus; and
A connection conductor to which the same-phase conductor of any one of the three-phase conductors is connected in the sealed container;
It is attached so as to be kept airtight at the other opening of the sealed container, and is arranged on substantially the same plane while supporting a plurality of the connection conductors of the same phase, and is connected to the power cable led out from the outside of the sealed container. A power cable termination, and
The plurality of cable heads include a first cable head that accommodates a first phase of the three-phase conductor of the power cable connection bus, and a second cable that accommodates a second phase of the three-phase conductor of the power cable connection bus. A cable head and a third cable head that accommodates a third phase of the three-phase conductor of the power cable connection bus, and the cable head is led out of the three-phase conductor with the insulating spacer interposed therebetween. The first cable head is connected in a row in a horizontal direction, and the first cable head supports the three-phase conductor of the power cable connection bus via an insulating spacer of the first cable head, and the second cable head The second and third phase conductors are passed through to the insulating spacer, and the second cable head passes through the insulating spacer of the second cable head. And supporting the third phase conductor to pass the third phase conductor to the insulating spacer of the third cable head, and the third cable head includes the insulating spacer of the third cable head. A gas-insulated switchgear characterized by supporting the conductor of the third phase through. A gas insulated switchgear comprising a cable head in which a three-phase conductor of a power cable connecting bus is separated for each phase, and a plurality of in-phase conductors are accommodated for each separated phase,
The gas insulated switchgear accommodates a three-phase conductor of the power cable connection bus, and leads the three-phase conductor to the cable head,
The cable head is
A main trunk portion that is partially openable and accommodates a three-phase conductor of the power cable connection bus; and a first branch portion that accommodates a plurality of first phase conductors in the three-phase conductor of the power cable connection bus A second branch portion for accommodating a plurality of conductors of the second phase in the three-phase conductor of the power cable connection bus; and a plurality of conductors of the third phase in the three-phase conductor of the power cable connection bus. A hermetically sealed container filled with an insulating gas having a third branch part;
An insulating spacer that is attached so as to maintain airtightness at the opening of the main body, and supports a conductor of a power cable connection bus;
A connection conductor to which the three-phase conductor is connected in the sealed container;
It is connected to the first to third branch portions, and is attached to each of the first to third branch portions so as to keep the hermetic container airtight, and substantially supports the plurality of in-phase connection conductors. A power cable termination connected to a power cable arranged on the same plane and derived from the outside of the sealed container; and
A gas insulated switchgear characterized by comprising:

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