TW200406965A - Gas insulated switch gear - Google Patents

Abstract

This invention proposes a gas insulated switch near which eliminates the variation of heat dissipation and cut-off performance between phases, improves the yield of manufacture, assures air tightness, standardizes the bushings, and improves production efficiency. A vacuum circuit breaker is supported by an insulating frame which is an insulating cylindrical member, and an opening passing through the insulating cylindrical member is provided at the vicinity of the movable portion of a vacuum bulb. The main circuit portion of a disconnecter provided with a ground switch is disposed at either the upper portion or the lower portion of the insulating cylindrical member of each phase to maintain the same positional relation with the vacuum bulb. Three-phase insulating spacers are stepared individually for respective phases on a tank and are shifted in a longitudinal direction and in a lateral direction with respect to the center of the bushing of the second phase. A bushing at the lower part of the tank has a sufficient length for installing a current converter on the outer part of the tank.

Description

200406965 «i V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to the structure of a gas-insulated switchgear. [Conventional technology] The conventional gas-insulated switchgear is provided with an operation slot through a stand on the base. The action groove has a shape in which a lower portion on the front side is cut, and an opening portion is formed on the front side of the action groove, and the opening portion is closed by a mounting plate. The inner side of the action groove is formed in an airtight state and is filled with an insulating gas. One end of an insulating frame made of a solid insulator and having a substantially U-shaped cross section is mounted on the inside of the mounting plate, and a vacuum circuit breaker is installed as a shutter on the inside of the insulating frame. In addition, a disconnector (d i s c ο η n e c t e r) with a grounded shutter as a shutter is provided above the insulating frame. Further, an operation section for operating the vacuum circuit breaker and an operation section for operating a disconnector with a grounding switch are provided on the outside of the mounting plate. The bus bar is arranged above the action groove. An opening is formed on the upper surface of the action groove, and a three-phase insulating spacer is provided as an insulating member that seals the opening in an airtight state. This three-phase insulating spacer is a plastic film of the three-phase inner conductor using a solid insulator. The upper end of this inner conductor is connected to the & bus, and the lower part is connected to a disconnector with a grounding switch. A three-phase composite bushing in which the inner conductor and the converter are buried in a bushing which is a solid insulator is provided at the lower part of the action groove. This bushing is installed inside the opening of the action groove through the O-ring and is hermetically sealed. A cable head is attached to the bushing from the front side of the gas-insulated switchgear. The aforementioned vacuum

314531.ptd Page 6 200406965 V. Description of the invention (2) The internal conductors of circuit breakers and bushings are connected by conductors, and power cables are connected to the cable ends. (For example, refer to Patent Document 1) [Patent Document 1] Japanese Patent Application Laid-Open No. 1 1-1 8 5 5 7 7 [Summary of the Invention] A conventional gas-insulated switchgear which is a problem to be solved by the invention is used to support a vacuum circuit breaker. The insulating frame has a U-shaped cross-section, and therefore requires reinforcement measures such as increasing the thickness of the end portion, and has the problem that it is difficult to dissipate heat generated by the vacuum circuit breaker portion. In addition, since the main circuit sections of each phase of the circuit breaker with a grounding switch are arranged inwardly in the vicinity of the circuit breaker, the circuit breaker section between each phase and the vacuum switch for electromagnetic fields is energized with the fault current. The effects are different, so there is a problem that the interruption performance of the vacuum circuit breaker varies from phase to phase. In addition, the three-phase insulating spacer installed on the action groove has a complicated shape, so the manufacturing yield is poor, and the flange surface is wide. Therefore, in order to maintain airtight performance, a large range of plane must be ensured on the action groove side. Degrees, which leads to high costs. Furthermore, since the bushing provided in the lower part of the action groove is embedded with a converter, the bushing becomes complicated and large, and the manufacturing yield is poor, and the workability is not good. In addition, it is necessary to meet the specifications of the converters desired by each customer, and this is a cause that hinders the standardization and production efficiency of the bushings. Means to solve the problem

314531.ptd Page 7 200406965 V. Description of the invention (3) In order to solve the above-mentioned problem, the gas-insulated switchgear of the present invention has the following components: a metal container sealed with an insulating gas; supported on the metal container, and can be connected with the outside Bus-side bushings connected to the circuit; an insulating frame supported on the container wall by one end in a metal container; a movable-side terminal supported by the insulating frame and connected to an insulating rod extending through one end of the insulating frame; Vacuum circuit breaker with fixed side terminals supported by the other end of the insulation cylinder; a circuit breaker with a rotatable blade provided in the insulation frame and connected between the bus-side bushing and the vacuum circuit breaker; connected to the vacuum circuit breaker i A cable head that can be connected to a power cable; and a current transformer for measuring the current from if to the cable head, characterized in that the insulating frame is a circular cylindrical body with a cross-sectional shape of a surface perpendicular to the axial direction, It also has an opening for connecting the movable-side terminal of the vacuum circuit breaker to the circuit breaker. -Also, it may have a flexible conductor that penetrates the insulation cylinder and connects the movable-side terminal to the blade, or the main circuit conductor including the bus-side bushing and the disconnector may be located substantially perpendicular to the axis of the vacuum circuit breaker In the plane, the busbar side bushings can also be offset from each other in each direction toward the inner direction and width direction of the gas-insulated switchgear, or the converter and the cable head can be separate parts.

Embodiment 1. As shown in FIG. 1, in the gas-insulated switchgear of the present invention, an action groove 3 is provided on a stand 2 made of a thin sheet metal. The front surface of the action groove 3 is formed in a cut shape. An opening is formed in the front of the action groove 3, and the opening is closed by the mounting plate 4. The inside of the action groove 3 is shaped

31453] .ptd Page 8 200406965 V. Description of the invention (4) It is airtight and filled with insulating gas. On the inside of the mounting plate 4, one side of an insulating cylinder 18 made of a solid insulator is installed so as to be separated from the main circuit part of the circuit breaker 6 by a gap of 5 mm or more, and is housed inside the insulating cylinder 18: The vacuum switch chamber 19 and the movable shaft 2 0 of the vacuum switch chamber 19 are connected to a blade support terminal 2 1 for a disconnector with a grounding switch so that the flexible conductor 2 2 does not hinder the operation of the movable shaft 2 0. Main circuit section of a circuit breaker, etc .; an insulating rod 2 3 that insulates the movable shaft 20 of the vacuum switch room 19 from the operating section 8 for the circuit breaker; and a movable shaft 2 that connects the insulating rod 23 and the vacuum switch room 19 0 adapters 2 4 and other mechanism parts. In addition, a disconnector 7 with a grounding switch is provided on the insulating tube 18. Furthermore, a circuit breaker operation portion 8 and a circuit breaker operation portion 9 are provided on the outside of the mounting plate 4 as in the conventional case. On the opposite side of the mounting plate 4 of the insulating cylinder 18, a fixed-side terminal 2 5 of a vacuum valve is installed through a fixed terminal 2 6. The upper insulating cylinder 18 projects upward and is equipped with a grounding shutter. On the inlet-side terminal 27 of the disconnector, above the movable valve 20 of the vacuum valve 18 of the insulating cylinder 18, a blade-supporting terminal 21 of the disconnector, which is slightly more protruded than the above-mentioned protrusion, and has a grounding shutter, is installed. In addition, an opening portion 28 is formed on the mounting plate 4 side of the small protruding portion and penetrates the insulating tube 18. The movable shaft 20 of the vacuum valve is connected to the flexible conductor 22 through the opening portion 28. The blade support terminal 21 of the circuit breaker with a grounding switch is provided above the insulating tube 18 of the mounting plate 4, and openings are formed in each phase at the same pitch as the insulating tube 18, and the opening is closed. The test terminal and ground terminal 29, which are in an airtight state, serve as an insulating member. End for this test

31453] .ptd Page 9 200406965 * V. Description of the invention (5) The sub-conductor and ground terminal 2 9 is embedded in the inner conductor 2 9 a in the center, and is opposite to the inner conductor 2 9 a The metal part 30 for the installation of the action groove 30 is provided with a recess 31 for mounting a bush which is air-tight to the action groove around the inner conductor 29 a on the outside of the metal part 30 for installation. Here, the inner end of the working groove of the inner conductor 2 9 a is connected to the ground-side terminal 3 2 of the circuit breaker with a grounding switch, and the outer end of the working groove is connected to the ground terminal. Around the opening above the insulating tube 18 of the mounting plate 4, there is a test terminal and ground terminal 2 on the circumference η having the same center as the center of the opening, and there are small holes for installation, and the test ground terminal. 29 is to insert the opening from the inside of the action groove, and insert the bolt 3 3 penetrating the mounting hole from the outside of the action groove into the mounting metal part 30 to be connected. -It is formed on the upper surface of the action groove 3 at a position which is slightly larger than the outer diameter of the bus bar 10 and is shifted in the front-back direction according to the phases above the insulation tube 18 at the same distance as the insulation tube 18 There is an opening portion, and a single-phase bushing 34 for a bus bar as an insulating member that seals the opening portion in an airtight state is provided. This single-phase bushing 34 is embedded with the inner conductor 3 4 a in the center, and is embedded with gold for the action groove 3 in the circumference centered on the inner conductor 34 a. Parts 3 5 are metal parts for installation. The outer side of 3 5 is provided with a recess 36 for centering the inner conductor 3 4 a for mounting a bush which is installed in an airtight state with respect to the action groove. Here, the inner end of the working groove of the inner conductor 3 4 a is connected to the input terminal 2 7 of the circuit breaker with a grounding switch by a connecting conductor 38, and the outer end of the working groove is connected to the bus bar 10. The circumference of the opening above the action groove has a circumference having the same center as the center of the opening

31453] .pid Page 10 200406965 V. Description of the invention (6) There is a small hole for the single-phase bushing 34, which is inserted into the opening rock grate from the inside of the action groove, and from the action groove Bolts 37 which pass through the mounting holes are inserted into the mounting metal parts and connected. In the lower part of the front face of the action groove 3, openings are formed under the insulating cylinder 18 at the same intervals as the insulating cylinder 18 according to each phase, and an insulating member is provided to seal the opening in an airtight state. Single phase bushing for cable connection 3 9. In this single-phase bushing 39, the inner conductor 39a is buried in the center, and the mounting metal part 40 corresponding to the action groove 3 is embedded in the circumference centered on the inner conductor 39a, and the mounting metal is buried in the mounting metal. The outer side of the part 40 is provided with a recess 41 for mounting a bush which is installed in an airtight state with respect to the action groove, with the inner conductor 39 as a center. Here, the inner end of the action groove of the inner conductor 39 is connected to the fixed terminal 26 of the circuit breaker via the connection conductor 4 3, and the outer end of the action groove is connected to the power cable 17 by the cable head 15. The single-phase bushing 39 has a small hole for mounting the single-phase bushing 39 around the opening at the lower part of the front surface of the above-mentioned action groove 3 on the circumference having the same center as the center of the opening. This opening is inserted into the inside, and the bolts 42 penetrating through the holes for ampere from the outside of the action groove are inserted into the metal fittings 40 for mounting and connected. In the gas-insulated switchgear of this embodiment, the insulating frame used to support the vacuum circuit breaker is a cylindrical body and has an opening portion. Therefore, reinforcement measures such as increasing the thickness of the end portion are not required as is conventional, and there may be Efficiently dissipates heat generated by the vacuum circuit breaker section. In addition, the main circuit conductor including the bus-side bushing and the disconnector is located in a substantially vertical plane including the axis of the vacuum circuit breaker, so the interruption performance of the vacuum circuit breakers of all phases is the same. Moreover, the bus-side bushing is directed toward the inside of the gas-insulated switchgear.

3] 4531.ptd p. 11 200406965

I. Description of the invention (7) and the directions of visibility are offset from each other, so the shape of the insulating spacer installed on the action groove can be simply formed 5 and the manufacturing yield and airtight performance can be easily maintained. The converter 4 4 is a separate component from the cable head 15 described above, so the manufacturing yield is good, the workability is also 9 and it can easily respond to the specifications of the converter desired by each customer. The embodiment will be described with reference to Fig. 2 〇 Comparing Fig. 2 with Fig. 1 shows that this embodiment does not have an open circuit I inside the insulation cylinder, but instead uses a short-circuit conductor 45 and does not pass through the shutter. The blade support terminal 21 and the fixed terminal 2 of the circuit breaker with a grounded ff closer are connected. Embodiment 3. Next, the embodiment will be described with reference to FIG. 3. : 2 figure plus-you can know by comparison 5 the position of the insulation tube 18 and the disconnector 7 with a grounding switch does not change the positional relationship of each other, but the fixed terminal 2 of the circuit breaker is reversed up and down The single-phase connection sleeve 34 connected to the upper part of the action slot is connected to the conductor 46, and the input terminal 2 7 of the circuit breaker with a grounding switch is a single-phase connected to the lower part of the front of the action slot by the connection conductor 4 7 Bushing 39 ^ and 5 single-phase approximate sleeve at the lower part of the front of the action slot 3 9 is connected to a transformer transformer I_ 4 8 instead of the power cable 1 7 5 but the power cable field arrester can have the same structure Let's connect. Embodiment 4. Next, Embodiment 4 will be described with reference to FIG. 4. Comparing Fig. 4 with Fig. 1, it can be seen that the single-phase bushing 39 at the lower part of the action tank is installed on the back side, and the power cable 17 is connected from the back side of the gas-insulated switchgear.

31453] .ptd Page 12 200406965 V. Description of the invention (8) Single-phase bushing 39. In the figure, the power cable 17 is pulled in from above the gas-insulated switchgear, but it can also be connected when the power cable 17 is pulled in from below. As explained above, according to the gas-insulated switchgear of the present invention, by forming a circular or oval shape of the insulator used to accommodate the main circuit part of the circuit breaker, the stress in the insulator can be dispersed, and the insulation can be realized. Thin wall. In addition, by providing the protrusions on the insulator, other metal parts required for mounting the terminals of the disconnector with a grounding switch are not required, and the assembly time can be shortened. Furthermore, by providing the through-holes Provided in a part of the insulation tube, the heat generated in the insulation tube can be easily dissipated to the outside of the insulation tube, and a large current can flow even with the same conductor size. [Effects of the Invention] According to the gas-insulated switchgear of the present invention, the insulating frame is a cylindrical body having a cross-sectional shape of a surface perpendicular to the axial direction, and has a movable-side terminal for connecting the vacuum circuit breaker to The opening of the circuit breaker can disperse the stress in the insulation frame and reduce the thickness of the insulation frame. The circuit breaker with a grounding switch can also be installed on the insulation frame. In a part of the insulating frame, heat generated in the insulating frame can be easily radiated to the outside, and a large current can flow even with the same conductor size.

314531.ptd Page 13 200406965 Brief description of the drawings [Simplified description of the drawings] Fig. 1 is a side sectional view of the first embodiment of the gas-insulated switchgear of the present invention. Fig. 2 is a side sectional view of a second embodiment of a gas-insulated switchgear according to the present invention. Fig. 3 is a side sectional view of a third embodiment of the gas-insulated switchgear of the present invention. Fig. 4 is a sectional view of a fourth embodiment of the gas-insulated switchgear of the present invention. Explanation of the P symbol] 2 Stand 3 Metal container (action slot) 4 Mounting plate 6 Circuit breaker 7 Disconnector with ground switch (disc ο η necter) 8 Operation unit for circuit breaker 9 Operation for circuit breaker 10 Bus bar 15 Cable head 17 Power cable 18 Insulating tube 19 Vacuum circuit breaker (vacuum switch room) Μ Movable shaft 21 Ah Tea TL flexible circuit breaker 23 Insulating rod 24 Adapter 25 Fixed side terminal 26 Fixed terminal 28 Opening section 29a ί 3 4a, 3 9a Internal conductor 30 > 35 ~ 40 Metal parts for installation

314531.ptd Page 14 200406965 Brief description of drawings 31, 3 6, 41 Recess 3 2 Ground terminal 3 3, 3 7, 4 4 Bolt 3 4, 3 9 Single-phase bushing 38, 42, 46, 47 Connection conductor 45 short-circuit conductor 48 counter transformer (converter)

3] 453] .ptd Page 15

Claims (1)

200406965 f VI. Application for patent scope 1. A gas-insulated switchgear, which has the following components: a metal container sealed with an insulating gas; a bus-side bushing that is supported by the metal container and can be connected to an external circuit; An insulation frame supported on the container wall by one end in the metal container; A vacuum circuit breaker supported on the insulating frame and having a movable-side terminal connected to an insulating rod extending through the one end of the insulating frame and a fixed-side terminal supported by the other end of the insulating cylinder; A rotatable blade of the insulation frame, and a disconnector connected between the bus-side bushing and the vacuum circuit breaker; a cable head connected to the vacuum circuit breaker and connectable to a power cable; and used for measuring A current transformer that flows to the cable head, wherein the insulating frame is a cylindrical body and has an opening for connecting a movable-side terminal of the vacuum circuit breaker to the circuit breaker. # The gas-insulated switchgear according to item 1 of the patent application scope, further comprising a flexible conductor that penetrates the insulating cylinder and connects the movable-side terminal to the blade. 3. The gas-insulated switchgear according to item 1 of the patent application scope, wherein the main circuit conductor including the bus-side bushing and the circuit breaker is located in a substantially vertical plane including the axis of the vacuum circuit breaker. 314531.pid Page 16 200406965 6. Application for patent scope 4. For the gas-insulated switchgear of item 1 of the scope of patent application, the bus-side bushings are oriented in the direction of the inside and width of the gas-insulated switchgear in each phase. Offset each other. 5. The gas-insulated switchgear according to item 1 of the scope of patent application, wherein the converter and the cable head are separate parts. 6. The gas-insulated switchgear according to item 1 of the scope of patent application, which further comprises a flexible conductor that penetrates the insulating cylinder and connects the movable-side terminal to the blade, and includes the bus-bar-side bushing and the disconnection The main circuit conductor of the device is located in a substantially vertical plane including the axis of the vacuum circuit breaker. 7. The gas-insulated switchgear according to item 1 of the scope of patent application, further comprising a flexible conductor that penetrates the insulating cylinder and connects the movable-side terminal to the blade, and the bus-side bushing is directed toward the gas insulation. The inside direction and width direction of the switching device are offset from each other. 8. The gas-insulated switchgear according to item 1 of the scope of patent application, further comprising a flexible conductor that penetrates the insulating cylinder and connects the movable-side terminal to the blade, and the converter and the cable head are separate Parts. 9. The gas-insulated switchgear according to item 1 of the scope of patent application, wherein the main circuit conductor including the bus-side bushing and the disconnector is located in a substantially vertical plane including the axis of the vacuum circuit breaker, and The converter and the cable head are separate parts. 10. The gas-insulated switchgear of item 1 of the scope of patent application, wherein, 31453] .ptd Page 17 200406965 V «Six. The scope of the patent application has a flexible conductor that penetrates the insulated cylinder and connects the movable-side terminal to the blade, and includes the bus-side bushing and the main of the disconnector. The circuit conductor is located in a substantially vertical plane including the axis of the vacuum circuit breaker, and the current transformer and the cable head are separate components. 1 1. The gas-insulated switchgear according to item 1 of the scope of patent application, wherein the bus-side bushings are offset from each other in phases toward the inner direction and width direction of the gas-insulated switchgear, and the converter and the Electrical_cables are individual parts. B. The gas-insulated switchgear according to item 1 of the patent application scope, further comprising a flexible conductor that penetrates the insulating cylinder and connects the movable-side terminal to the blade, and the bus-side bushing is directed toward the gas-insulated switch. The inner direction and the width direction of the device are offset from each other, and the current transformer and the cable head are separate parts. 1 3. A gas-insulated switchgear, which is a metal container that is sealed with an insulating gas; a bus-side bushing that is supported by the metal container and can be connected to an external circuit; _ in the metal container An insulating frame supported on the container wall by one end; a movable-side terminal supported on the insulating frame and connected to an insulating rod extending through the one end of the insulating frame; and supported by the other end of the insulating cylinder Vacuum circuit breaker with fixed side terminals; 314531.ptd Page 18, 200,406,965 6. The scope of the patent application has a disconnector provided in the above-mentioned insulating frame and connected between the above-mentioned bus-side bushing and the above-mentioned vacuum circuit breaker. The electric grommets that can be connected to the power cable and the converter used to measure the current flowing to the cable head are characterized by: • The main circuit conductor including the bus-side bushing and the disconnector is located in the vacuum The axis of the circuit breaker is in a substantially vertical plane. 14 • The gas-insulated switchgear of item 13 of the patent, which has a flexible conductor that passes through the insulating cylinder and connects the movable-side terminal to the blade. 〇15 • Gas-insulated switchgear of item 13 in the patent scope 5 of the converter and the cable head are separate parts. ○ 16 The gas-insulated switchgear of item 13 of the patent application, 5 of which 9 also has a penetrating insulating body to connect the movable-side terminal to The flexible conductor of the blade, and the current transformer and the cable head are separate parts. 0 17, • A gas-insulated switchgear y has the following components: a metal container sealed with an insulating gas is supported by the metal container The busbar side that can be connected to the external circuit is roughly sleeved in the above-mentioned metal container with an insulating frame supported on the container wall by one end, and supported on the insulating frame 5 and has a structure that penetrates through the insulating frame. 31453] .ptd page 19 2004069 ^ 5 VI. The scope of the patent application and the above-mentioned air circuit breaker with the above-mentioned busbar and the cable head used for its special clearance device. Blade 19. If the application is dedicated and has individual zeros running through the blades, if the application is applied, the movable-side terminal connected to the insulating rod extending at one end of the above-mentioned current conversion is a fixed-side terminal supported by the other end of the insulating cylinder. True 5 is provided on the rotatable blade of the insulation frame, and is connected to the disconnector between the side bushing and the vacuum circuit breaker; the vacuum circuit breaker is connected to be connected to the power cable; and the measurement flow to the above The current transformer of the cable head; the characteristics are: the bus-bar bushings are offset from each other in phases toward the inner direction and width direction of the gas insulation opening. The gas insulated switchgear according to Item 17 is a flexible conductor connected to the movable-side terminal through the insulating cylinder. The gas-insulated switchgear according to Item 17 is a flexible conductor connected to the movable-side terminal through the insulating cylinder, and the converter and the cable head are components. The gas-insulated switchgear according to item 17 of the utility model, wherein the device and the cable head are separate parts. I __ mm 314531.ptd Page 20