KR100329907B1 - Switching device - Google Patents

Abstract

An object of the present invention is to enable reduction of the distance between the main circuit terminals of each phase covered by the hood member of the breaker constituting the disconnect device, the breaker width, and the width dimension of the switchboard. U-shape made of insulating material for each phase of pull-out circuit breaker 10, with the insulating cylinder portion 24h of each phase provided on the bushing members 24 and 25 made of insulating material sandwiched from both sides thereof. Both edges of the hood member 13 having a cross section are positioned.

Description

Switchgear {SWITCHING DEVICE}

The present invention relates to a switchgear for opening and closing an electric passage of a main circuit in a multiphase AC power distribution facility.

FIG. 5 is a longitudinal sectional view showing a configuration of a switchgear for a three-phase AC circuit in a power distribution facility, and FIG. 6 is a cross sectional view taken along the line VI-VI of FIG. 5, wherein reference numeral 1 denotes a disconnector main body (hereinafter, cradle ( cradle), 10 denotes a draw-out circuit breaker. The cradle 1 has a guide rail portion 3 extending forward from the lower end of the partition wall 2 to mount the partition wall 2 and the draw-out circuit breaker 10, and the partition wall 2 has a top, Then, a pair of bushing members 4 and 5 set this as a set at predetermined intervals, and three sets are provided in parallel corresponding to each of the three phases.

Each of the bushing members 4 and 5 is formed in the same structure using an insulating material, and is positioned substantially concentrically on both sides of the flange portions 4a and 5a. It is installed and configured. In each bushing member (4, 5), an inner collar is provided on the inner circumferential surface of the insulated cylindrical portion inside, and one end of each of the upper and lower connection terminals (6, 7) is fixed, and the other end thereof It extends to the rear of the partition 2 and is connected to each end of the main circuit conductor 8 or 9 of each phase.

On the other hand, the draw-out circuit breaker 10 is a hood member 13 corresponding to each of the three phases formed by molding the insulating material through the mounting table 12 on the trolley 11 placed on the guide rail portion 3; (3) is installed side by side, and the box 14, which is located at the rear of it and accommodates the three-phase combined operation mechanism, is located at the rear thereof, and the protective wall 15 is provided.

Each hood member 13 is formed in the same structure, and has a U-shape in plan view as shown in FIG. 6 in which the front, upper and lower surfaces opposing the disconnector main body 1 are respectively opened, and each hood The member 13 (is provided with the open front side facing the upper and lower pair of bushing members 4 and 5. The inner wall of each hood member 13 has a pair of upper and lower portions separated by a predetermined interval. The support arms 13a and 13b protrude toward the side of the bushing members 4 and 5, and a vacuum bulb 16 is disposed therebetween.

The vacuum bulb 16 is configured by placing one end of the fixed electrode 17 in the upper portion of the high vacuum chamber and one end of the movable electrode 18 in the lower portion thereof. The other end of the fixed electrode 17 is the main circuit. In contact with one end of the terminal 19, the other end of the main circuit terminal 19 extends toward the side of the bushing member 4 so as to face the upper connection terminal 6 of the cradle 1, and also the movable electrode ( The other end of 18) is connected to one end of the main circuit terminal 21 via the flexible conductor 20, and the other end of the main circuit terminal 21 faces the lower connection terminal 7 of the cradle 1 described above. Extending toward the side of the bushing member 5.

In addition, an upper end of the insulating rod 22 is connected to the movable electrode 18, and a lower end thereof is connected to one arm of the operation link 23 axially supported by the trolley 11, and also the operation link 23. The other arm of) is connected to the operation mechanism inside the box 14.

In such an opening and closing device, the pull-out circuit breaker 10 is moved to the cradle 1 side by moving the guide rail portion 3 toward the cradle 1 side, and the main circuit of each phase of the upper and lower parts is pushed into the cradle 1. The front ends of the terminals 19 and 21 enter the bushing members 4 and 5 of the respective phases corresponding to each other and are connected to the upper and lower connection terminals 6 and 7. As a result, the main circuit conductors 8 and 9 are provided with the upper and lower connection terminals 6 and 7, the upper and lower main circuit terminals 19 and 21, the flexible conductor 20, and the vacuum bulb 16. Connected to the fixed electrode 17 and the movable electrode, an electric passage is formed.

When the pull-out circuit breaker 10 is moved in the reverse direction on the guide rail portion 3, that is, taken out from the cradle 1, the upper and lower main circuit terminals 19 and 21 and the upper and lower connection terminals 6 and 7 are connected. Departed from each other, the electric passage is opened.

In addition, the electric passage is moved from the fixed electrode 17 inside the vacuum bulb 16 by rotating the operation link 23 around its axial support point by the operation mechanism and pulling down the insulating rod 22. When the electrode 18 is separated, the blocking can be performed.

By the way, in such a conventional switchgear, as shown in FIG. 6, the main circuit terminals 19 of each phase (or 21 of each phase) have a predetermined distance in the state where the draw-out circuit breaker 10 is pushed into the cradle 1. Although it is positioned at P, the width dimension W of the draw-out circuit breaker 10 is also naturally determined accordingly because it is not set to satisfy the insulation distance L in the air between metals in order to prevent discharge therebetween. There was a limit to reducing the width dimension.

In Japanese Patent Laid-Open No. 5-64324, an insulating cylinder is disposed around the main circuit conductor of each phase, and an insulating cylinder having an inner diameter larger than that of the insulating cylinder is also disposed on the outer peripheral portion of the main circuit terminal of the circuit breaker. It is proposed to have a structure in which both insulating cylinders fit inside and outside in a state where the main circuit terminal is connected to the main circuit conductor. In this structure, although the insulation distance L in the air between metals becomes large, there is a problem that it is difficult to reduce the phase-to-phase dimension and the circuit breaker width dimension W because of the structure in which insulation cylinders are provided in each phase.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is such that both edges of the cross-section U-shaped hood member covering the main circuit terminals are positioned so as to overlap with both sides of each insulating tube portion of the bushing member. Therefore, the present invention provides an opening / closing device in which the insulation distance L in the air is increased, and the interphase dimension, the breaker width dimension, and the disconnector width dimension can be reduced.

1 is a longitudinal sectional view showing a configuration of Embodiment 1 of the present invention;

2 is a cross sectional view taken along line II-II of FIG. 1;

3 is a cross-sectional view showing a configuration of Embodiment 2 of the present invention;

4 is a cross-sectional view showing a configuration of Embodiment 3 of the present invention;

Fig. 5 is a longitudinal sectional view showing the structure of a switchgear for a three-phase AC circuit in a conventional power distribution facility.

FIG. 6 is a cross sectional view along line VI-VI of FIG. 5; FIG.

Explanation of symbols on the main parts of the drawings

1: disconnector main body (cradle) 2: bulkhead

3: guide rail part 8, 9: main circuit conductor

10: withdrawal breaker 11: bogie

13: hood member 15: protective wall

16: vacuum bulb 17: fixed electrode

18: movable electrode 23: operation link

24, 25 bushing member 24j: connection port

An opening and closing device of the invention according to claim 1 is provided with a main body having a bushing member made of an insulating material which is formed through a partition wall and has a partition area for individually positioning one end of the main circuit conductor of each phase of the multiphase AC circuit. A vacuum bulb having fixed and movable electrodes connected to each other, a main circuit terminal and the vacuum bulb having one end connected to the fixed electrode and the movable electrode, and the other end connected to and separated from the main circuit conductor A hood member made of an insulating material covering each of the furnace terminals, and having a circuit breaker disposed forward and retractable with respect to the main body of the circuit breaker, wherein the bushing member introduces the main circuit terminal into each partition area. The hood member has an insulated tube portion, and the hood member is formed in a U-shaped cross section with an open side facing the bushing member. When the forward side, characterized in that the two side ends have edges which is located to overlap with it at both sides of the insulating tube.

In the invention according to claim 1, since both side edges of the U-shaped hood member are positioned opposite to both sides of the insulated cylinder portion of the bushing member, the insulation distance in the air becomes long, and the distance between the main circuit conductors of each phase is increased. It is possible to shorten the size and to easily downsize.

The opening and closing apparatus of the present invention according to claim 2 is characterized in that the insulating plate portions are provided on both sides of each of the insulating cylinder portions of the bushing member.

The opening and closing apparatus of the present invention according to claim 3 is characterized in that the insulating plate portion is protruded at a distance from both sides of the insulating cylinder portion provided side by side of the bushing member at a distance from the insulating cylinder portion.

In the switching device of the invention according to claim 4, a hood member made of an insulating material covering the vacuum bulb and the main circuit terminal of each phase is integrally formed, and the vacuum bulb is divided between the vacuum bulbs of the adjacent phases. An insulating plate portion is formed.

The opening and closing apparatus of the invention according to claim 5 is characterized in that the hood member has a U-shaped cross section, and both edges of the hood member are interposed between the insulating cylinder portion and the insulating plate portion of the bushing member.

In the opening and closing device of the invention according to claim 6, in the insulating plate portion of the hood member forming the U-shape, the insulating plate portions located on both outer sides are located between the insulating cylinder portion and the insulating plate portion of the bushing member, and the other insulating plate portion is placed between the insulating cylinder of the bushing member. It is characterized in that it is interposed in each.

In the invention according to Claims 2, 3, 5, and 6, the insulation distance of the metal is increased by protruding an insulating plate part made of an insulating material between the insulating tube parts so as to separate the main circuit terminals from the insulating cover member. It can extend and shorten the dimension between insulating cylinder parts, and it becomes possible to further miniaturize.

In the invention according to claim 4, there is an advantage that the configuration can be simplified by integrating a hood member made of an insulating material for each phase.

(Example)

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated concretely based on the drawing which showed the Example.

(Example 1)

1 is a longitudinal cross-sectional view of a switchgear in a three-phase AC switchgear installation showing the configuration of Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, wherein 1 is a disconnector. Main body (referred to as cradle), 10 is a drawout breaker. The disconnector main body 1 has a partition 2 and a guide rail portion 3 extending forward from the lower end thereof, and the partition 2 has an upper bushing having a three-phase integrated structure at predetermined intervals up and down. The member 24 and the lower bushing member 25 are penetrated at positions facing each other up and down, respectively.

The upper and lower bushing members 24 and 25 are integrally molded using an insulating material, and one side is different from the other in that it has the same structure as inverting the upper and lower sides thereof. Since the same shape and the same size are configured, the upper bushing member 24 will be described below. The bushing member 24 includes three partition regions 24a, 24b, 24c formed integrally by molding an insulating material for introducing the main circuit conductors 8 of each of the three phases. Each of the compartments 24a, 24b and 24c is an empty area surrounded by the lower plate part 24d, the upper plate part 24e, the front plate part 24f and the side plate part 24g each of which the lower part, the upper part and the front part are made of an insulating material. It is.

Insulating cylinders 24h are provided in each front plate portion 24f at substantially the center of the partition area 24b and near the partition area 24b in the partition areas 24a and 24c. Each insulated cylinder portion 24h has a proximal end passing through the front plate portion 24f, respectively, through the inside of the partition regions 24a, 24b, and 24c, and the distal end portion thereof toward the pull-out circuit breaker 10 side, that is, toward the first half. It protrudes in length and is integrally provided with the front plate part 24f. Each compartment 24a, 24b, 24c is provided with a connection port 24j through a support 24i made of an insulating material, respectively, and each connection port 24j is provided with an upper main circuit conductor 8 (or 9). One end is fixed.

Also in the lower bushing member 25, the structure is substantially the same as that of the upper bushing member 24, and corresponding parts are given the same numbers.

On the other hand, the draw-out circuit breaker 10 has a U-shaped cross section in which the integrated material is molded and integrated through the mount 12 on the trolley 11, and the cradle 1 side is opened, and the top and bottom are closed. The three hood members 13 are provided in the cradle 1 in the lateral direction and side by side in correspondence with the upper and lower insulated cylinder portions 24h, and a box accommodating the operation mechanism at the rear of the trolley 11. (14), and located behind it again, the protective wall 15 is provided side by side.

The hood member 13 is provided with a proximal end of the support arms 13a and 13b at predetermined intervals up and down on the inner wall thereof, and its distal end extends toward the cradle 1 side therebetween. The vacuum bulb 16 is arranged in the longitudinal direction.

The vacuum bulb 16 is disposed inside the high vacuum chamber so as to face the lower end of the fixed electrode 17 at the upper side and the upper end of the movable electrode 18 at the lower side thereof, and the upper end of the fixed electrode 17. One end of the main circuit terminal 19 is connected thereto, and the other end thereof extends laterally toward the main circuit conductor 8 of the cradle 1.

Meanwhile, one end of the flexible conductor 20 is connected to the lower end of the movable electrode 18, the other end thereof is connected to one end of the main circuit terminal 21, and the other end thereof is the main circuit conductor of the cradle 1. It extends laterally toward (9).

Further, an upper end of the insulating rod 22 is connected to a lower end of the movable electrode 18, and a lower end thereof is connected to one arm of the operation link 23. The insulating rod 22 is comprised with the insulator etc. provided with the collar 22a at regular intervals in the axial length direction. The operation link 23 is axially supported by the trolley 11 at its central part, and the other arm is connected to an operation mechanism arranged inside the box 14.

The operation of the first embodiment will be described.

In Fig. 1 and Fig. 2, the pull-out circuit breaker 10 is moved toward the cradle 1 side to reach its forward limit, and the upper and lower main circuit terminals of the pull-out circuit breaker 10 are shown. 19 and 21 are inserted into respective connection ports 24j in the upper and lower bushing members 24 and 25 of the cradle 1, respectively, through the insulating tube portion 24h, and the main circuit conductors 8 and 9, respectively. It is in the connected state.

In this state, the main circuit conductors 8 and 9 are connected to a vacuum bulb (B) through the connection port 24j, the main circuit terminals 19 and 21, the flexible conductor 20, the fixed electrode 17, and the movable electrode 18. The fixed electrodes 17 and the movable electrodes 18 of the 16 are connected to each other.

Further, in the draw-out circuit breaker 10, the hood member 13 is molded integrally into a U-shaped cross-section by molding an insulating material, and the open shaft is directed toward the cradle 1 side, and both side edges thereof are On both sides of the upper and lower pairs of the insulating cylinders 24h of the cradle 1, they are overlapped with each other at night intervals and shielded from the insulating cylinders of the other phases. As a result, the insulation distance in the air is increased without the metal parts directly facing each other, whereby the interphase dimensions, the circuit breaker dimensions, and the like can be reduced.

In addition, connection and disconnection of the vacuum bulb 16 rotate the operation link 23 around its axial support point by the operation mechanism, thereby elevating the movable electrode 18 through the operation rod 22, thereby fixing the fixed electrode ( 17) The connection and disconnection are made by connecting and disconnecting the electric passage.

In the first embodiment, the upper and lower main circuit terminals 19 and 21 are connected to each other through the insulated tube portion 24h in the compartments 24a, 24b, and 24c provided in the cradle 1, respectively. Is connected to the main circuit conductors 8 and 9, but at the same time, the respective insulating cylinder portions 24h of the upper and lower partition regions 24a, 24b, and 24c are collectively covered on both sides by the hood member 13, Without the mutually opposing main circuit terminals 19 or 21 located adjacent to each other, the insulation distance L in the air, such as metal, becomes large, and the width of the breaker, the disconnecting device, and the width between phases are shortened.

(Example 2)

3 is a cross-sectional view of the switching device corresponding to FIG. 2 showing the configuration of the second embodiment.

In the second embodiment, in each of the compartments 24a, 24b, and 24c of the cradle 1, the insulating cylinder portions 24h and the insulating cylinder portions on both sides of the upper and lower insulating cylinder portions 24h are provided. The outer side of 24h is formed by protruding the insulating plate part 28 which consists of an insulating material to the height of the magnitude | size similar to the length of the insulating cylinder part 24h, respectively.

As a result, both end edges of the hood member 13 in the draw-out circuit breaker 10 can be inserted into non-contacting positions at intervals between the insulating plate portion 28 and the insulating cylinder portion 24h. The insulation distance L in the air between the main circuit terminals 19 adjacent to each other becomes further larger, and the distance between the two main circuit terminals 19 or 21 can be further closer.

Other configurations and operations are substantially the same as the configurations and operations in Embodiment 1, and therefore, the same numerals are assigned to corresponding parts, and description thereof is omitted.

(Example 3)

4 is a cross-sectional view of the opening and closing apparatus corresponding to FIG. 2 showing the configuration of the third embodiment.

In the third embodiment, three U-shaped grooves 29a and 29b are formed on the front side of the hood member 29 having the hood members arranged individually side by side as an integral structure, and the insulating member molded and integrally formed. 29c), and insulating plate portions 29d are formed between the groove portions and on both outer sides thereof.

On the other hand, the cradle 1 is provided with the insulating plate part 28 standing up on the outer side of the insulating cylinder located in both outer sides of the insulating cylinder part 24h provided in parallel in Example 1. As shown in FIG.

In the third embodiment, the insulation distance L in the air between the main circuit terminals 19 made of metal becomes large, and the width dimension between the main circuit terminals 19 can be shortened, and the hood member ( The configuration of 29) can be simplified, and the cost can be reduced.

Since other structures and operations are substantially the same as those in the first embodiment, corresponding parts are assigned the same numbers, and description thereof is omitted.

In the invention according to claim 1, since both edges of the U-shaped hood member are positioned in such a manner that the insulating cylinder portion of the bushing member is sandwiched from both sides thereof, the insulation distance in the air becomes long, and the main circuit of each phase is increased. The distance between the conductors can be shortened, and the miniaturization can be easily performed.

In the invention according to Claims 2, 3, 5, and 6, the insulation distance of the metal is extended by protruding an insulating plate portion made of an insulating material between the insulating tube portions so as to separate between the main circuit terminals in the insulating cover member. As a result, the dimension between the insulating cylinders can be shortened, and further miniaturization becomes possible.

In the invention according to claim 4, there is an advantage that the structure can be simplified by integrating a hood member made of an insulating material for each phase.

Claims (6)

A disconnector main body having a bushing member made of an insulating material penetrating the partition wall and having a partition area for individually positioning one end of the main circuit conductor of each phase of the multiphase AC circuit; A vacuum bulb having fixed and movable electrodes connected to and separated from each other, a main circuit terminal and the vacuum bulb and a main circuit having one end connected to the fixed electrode and the movable electrode and the other end connected to and separated from the main circuit conductor It has a hood member made of an insulating material covering the terminal for each phase, and has a circuit breaker arranged to be forward and retractable with respect to the disconnecting device main body, The bushing member has an insulated barrel for introducing the main circuit terminal to each partition area, In addition, the hood member is formed in a U-shaped cross-section with the side facing the bushing member open, and when the breaker is advanced to the disconnecting device main body, both side end edges of the hood member are located on both sides of the insulated cylinder portion so as to overlap it. Switchgear characterized in that it has. The method of claim 1, Opening and closing device, characterized in that the insulating plate portion protrudes toward the circuit breaker side on each side of each well communicating portion of the bushing member. The method of claim 1, An opening and closing device, characterized in that the insulating plate portion protrudes toward the circuit breaker side at intervals with the insulating cylinder portion on both outer sides of the insulating member provided side by side of the bushing member. The method according to claim 1, 2 or 3, And a hood member made of an insulating material covering the vacuum bulb and the main circuit terminal of each phase is integrally formed. The method of claim 2 or 3, The hood member has a U-shaped cross section, and both edges of the hood member are interposed between the insulating tube portion and the insulating plate portion of the bushing member. The method of claim 5, The partition plate part made of insulating material positioned on both sides of the U-shaped hood member is interposed between the insulating tube portion and the insulating plate portion of the bushing member, and the other insulating plate portion is interposed between the insulating tube portion of the bushing member. Switchgear.