JPH08185770A - Insulating frame for switchgear - Google Patents

Abstract

PURPOSE: To improve the surface creepage insulation performance of an insulator to be fitted with a vacuum switch, improve the fitting work of the insulator of the vacuum switch, and prevent the cracking of an insulating cover covering the insulator of the vacuum switch. CONSTITUTION: Three half-cylinders are connected to form an insulating frame 6 insulating and holding a vacuum switch 2, and the portion of the insulating frame 6 fixing the vacuum switch 2 is a dome type. The insulating frame 6 is basically covered with five faces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch used in power receiving / distribution equipment.

[0002]

2. Description of the Related Art FIG.
It is a top view which shows the conventional switch shown by the 5th publication.
FIG. 12 is a perspective view of FIG. 13 to 15 are perspective views of similar circuit breakers viewed from three directions.

In FIGS. 11 to 15, reference numeral 1 denotes an insulating frame having an insulating property provided with mounting bases 1a and 1b to which a pair of terminals 3 and 4 described later are fixed, and surrounding the mounting bases 1a and 1b. Partition walls 1c and 1d that are concentrically surrounded are integrally formed, and partition walls 1e, 1f, 1g, 1h, and 1i are integrally formed between the partition walls 1c and 1d, respectively. Between partition walls 1g and 1h and partition wall 1e and partition wall 1
Between the h and 1i and the partition wall 1f, the open portion 1 is formed.
j, 1k, 11 and 1m are provided.

Reference numeral 2 denotes a vacuum switch which is horizontally supported by an insulating frame 1, and a fixed electrode and a movable electrode are housed in a sealed container 2a. Reference numeral 3 denotes a terminal connected to the fixed electrode of the vacuum switch 2 and fixed to the mounting base 1a of the insulating frame 1. Reference numeral 4 denotes a terminal connected to the movable electrode of the vacuum switch 2, which is fixed to the mounting base 1b of the insulating frame 1 with a bolt 5.

Reference numeral 17 denotes an operation mechanism unit fixed to the insulating frame 1. The operation mechanism unit 17 and the crossbar 22 are rotatably connected to each other.
A lever 22a attached to the crossbar 22 opens a movable electrode (not shown) of the vacuum switch tube 2 in the opening direction A (see FIG. 1).
3 front direction) and closing pole direction A '(back direction in FIG. 13)
Then, the movable electrode (not shown) inside the vacuum switch tube 2 is driven by rotating the crossbar 22. 21
Is a transparent cover that is detachably attached to the insulating frame. A terminal block 20 is arranged to connect the control unit inside the operation mechanism and an external circuit.

[0006]

Since the conventional switch is constructed as described above, if it is used for a long time in the above-mentioned state, fine dust is deposited on the upper surface of the insulating frame 1. Furthermore, if the temperature around the switchboard drops in a short time, dew condensation will occur in the switchboard. The dew condensation may occur on the surface of the insulating frame 1, or the dew condensation formed on the upper portion of the switchboard may drop on the upper surface of the insulating frame 1. The water generated on the upper surface of the insulating frame 1 in this way is absorbed by the accumulated dust and deteriorates the insulating performance of the creeping surface of the insulating frame 1. When the amount of dew condensation increases, water collects around the partition walls 1c, 1d, 1e, 1f, 1g, 1h, and 1i and stays for a long period of time. Therefore, there is a problem that the performance of creepage insulation between the terminals 3 and 4 or between the terminals 3 and 4 and the ground is deteriorated, and there is a risk of short-circuiting between phases or a ground fault. Further, the vacuum switch tube 2 was covered with the transparent cover 21 on the upper surface of the insulating frame 1, but since the transparent cover 21 is made of a thermoplastic material, tracking is likely to occur when it is exposed to a voltage applied state for a long period of time. It was for that reason,
It was necessary to keep a sufficient distance from the live part. Therefore, the fixed portion between the insulating frame 1 and the transparent cover 21 is located at the end of the insulating frame 1 which is separated from the charging portion. Therefore, if you have a circuit breaker body for handling, the transparent cover 2
When touching 1, the transparent cover 21 may be damaged due to excessive stress. In addition, the transparent cover 21
Due to the combination of the flat surfaces, the function of draining the accumulated water was not sufficient, and therefore the material being thermoplastic further promoted the possibility of tracking when soiled.

The present invention has been made in order to solve the above-mentioned problems. It quickly drains dew condensation water and does not break even when carried, and an insulating cover for supporting the open surface of an insulating frame. By covering with, the switch with high safety is provided.

[0008]

Means for Solving the Problems Claim 1 according to the present invention.
In this switch, three vacuum switches, each having a fixed electrode and a movable electrode, are fixed in parallel in a closed cylindrical container at a predetermined interval to an insulating frame, and a pair of terminals of each electrode are arranged in the longitudinal direction of the container. A switch which is arranged and fixed to an insulating frame, and which drives a movable electrode through a rotatable insulating crossbar to drive a vacuum switch tube to open and close the vacuum switch tube,
It has three semicircular insulative main bodies in which an insulating frame is placed in parallel with each container including a side where a pair of terminals are arranged, and a cover for covering the semicircular shape of the main body. However, three semicircular pieces are formed in a capsule shape.
The switch according to claim 2 fixes a vacuum switch tube and three semicircular insulative main bodies in which an insulating frame is juxtaposed with each container including a side on which a pair of terminals are arranged with a predetermined interval. The upper conductor and the upper end plate are formed by a dome-shaped cover. The switch according to claim 3, wherein the insulating frame is provided in parallel with each container including a side where a pair of terminals are arranged with a predetermined space therebetween, and three semi-cylindrical columns have five insulating surfaces and a vacuum switch tube periphery. And one surface of the other open portion is formed with an insulating cover. Further, the hook portion of the insulating frame, the hook portion of the insulating cover, and the insulating frame are provided with three-direction contact portions of the insulating cover.

[0009]

In the switch according to the first aspect of the present invention, by covering the vacuum switch tube with the insulating frame in the form of a capsule, fouling substances and the like are less likely to deposit on the high-voltage charging portion, so that deterioration of the creeping insulation performance is prevented. In the switch of the second aspect, by covering the upper conductor and the upper end plate for fixing the vacuum switch tube with a dome-shaped insulator, a sufficient creeping distance can be secured, thereby preventing deterioration of the creeping insulation performance. In the switch according to claim 3, the insulating frame basically has a five-sided structure, and one surface of the other opening is covered with an insulating cover, so that the charging section is not easily touched and assembled. Work can be facilitated. Further, by providing the insulating frame with the three-direction contact portions of the insulating cover, the insulating cover has sufficient strength and can be prevented from being damaged.

[0010]

【Example】

Example 1. The first embodiment of the present invention will be described below. 1 is a plan view of the first embodiment, and FIG. 2 is II-II of FIG.
3 is a bottom view of FIG. 1, FIG. 4 is a perspective view of FIG. 3 viewed from the right side, FIG. 5 is a perspective view of the left side of FIG. 3, and FIG. V in Fig. 1 when
It is sectional drawing of the I-VI line. FIG. 7 shows the same VI-V as FIG.
The vacuum switch is in a closed state in the I section (a sectional view. Further, FIG. 8 is a perspective view seen from above in FIG. 2. FIG. 9 is a perspective view of the insulating cover 21. In FIGS. , 2 to 5 are the same as the conventional ones.In the vacuum switch 2, the terminal portion 2b of the fixed electrode is connected to the terminal 3, and the terminal portion 2c of the movable electrode is connected to the terminal 4. 6 is the vacuum switch 2
An insulating frame having an insulating property in which three of them are horizontally supported and parallel to each other, and three semi-cylindrical main bodies 6a are arranged in parallel, and the arc-shaped ends of the main bodies 6a are vacuum switches 2
Are connected to each other by a connecting body 6b having an insulating property, and a groove 6c is formed between each main body 6a.

Further, the insulating frame 6 is integrally formed with an independent dome-shaped dustproof body 6d at a portion facing the terminal portion 2b of the fixed electrode, and a cutout portion 6e for fastening the terminal portion 2b is provided. There is. The cutout portion 6e is the terminal portion 2
You may seal with another insulating member after the work of b. 6f
Partition walls 6 and 6g are provided on the insulating frame 6, and are formed so as to surround the terminals 3 and 4. 7 is a convex stopper provided on the insulating frame 6 for preventing the movement of the terminal 3, 8 is a pressure contact rod connected to the movable electrode of the vacuum switch 2, and 9 is one end locked to the pressure contact rod 8. The contact spring 10 is a flexible connecting wire that connects between the terminal 2c of the movable electrode of the vacuum switch 2 and the terminal 4,
Reference numeral 11 denotes an insulating crossbar that is in contact with the other end of the contact pressure spring 9,
The rotation by the drive shaft 12 is converted into a linear motion to drive the movable electrode of the vacuum switch 2. The connecting crossbar 11 is rotatably attached to the insulating frame 6 by a crossbar retainer 15. Also, the crossbar retainer 15 has screw holes 15a.
Is attached. In FIG. 6, when the drive shaft 12 rotates in the clockwise direction, the movable electrode of the vacuum switch 2 is moved to the right in the figure by the insulating crossbar 11, and the vacuum switch 2 is turned on.

Numeral 14 is a spring attached to the insulating frame 6 at one end and to a lever (not shown) provided on the drive shaft 12 at the other end. When the spring is released, the drive shaft 12 is rotated to turn the vacuum switch 2 on. Drive to the open side. Reference numeral 17 is an operation mechanism fixed to the insulating frame 6, and a drive shaft 12.22 is an insulating cover which receives an instruction and closes the open surface of the insulating frame 6 so that it is hooked on the hook 6h of the insulating frame 6. 21 is inserted in the insulating frame 6 in the direction A in FIG. FIG. 10 is a diagram in which the insulating cover 21 is attached to the insulating frame 6. In FIG. 9, the hook portion 21a of the insulating cover 21 and the supports A21c and 21d.
Also, the support shafts B21e and 21f are configured to contact the hook portion 6h of the insulating frame 6 and the support shaft C6b.

Next, the operation will be described. 1 to 6, when the vacuum switch 2 is in the open state as shown in FIG. 6, the operating mechanism 17 drives the drive shaft 12 clockwise in response to a closing command to turn on the vacuum switch 2. The closed state of the vacuum switch 2 is shown in FIG. At this time, the spring 14 shown in FIG. 3 and the contact pressure spring 9 shown in FIG. Further, in the closed state of FIG.
2 is driven in the opening direction, the spring 14 and the contact spring 9
The vacuum switch 2 is opened due to the release of the electric power of ## EQU3 ## and the open state shown in FIG. 3 and 4, the insulation between the phases can be maintained and the creepage distance can be secured by forming the vacuum switch 2 into an insulating case having a three-phase integrated structure in which each phase is separated in a capsule shape.

Example 2. Although the semi-circular capsule shape in the interphase direction has been described in the first embodiment, the creeping distance in the interphase direction can be sufficiently secured by covering the fixing portion 2b of the vacuum switch 2 with the dome-shaped cover.

Example 3. The insulating frame 6 is made of an insulating material based on unsaturated polyester, and its shape is a thin plate structure, and five surfaces are covered. By covering the remaining one open surface with the insulating cover 21, the entire six surfaces are covered with the cover. Further, the work of attaching the vacuum switch 2 to the insulating frame 6 is performed from the open surface side, and then the insulating cover 21 is attached to the insulating frame 6. As shown in FIGS. 9 to 10, the insulating cover 21 is provided with an insulating cover 21.
Is inserted into the insulating frame 6 in the A direction. Therefore, the hook portion 21a of the insulating cover 21, the supports A21c, 21d and the supports B21e, 21f are the hook portions 6h of the insulating frame 6,
Since the structure is such that it abuts against the supports c and 6b,
In the above, the insulating cover 21 is immovable in the A, B, and D directions after coming into contact with the insulating frame 6. After the insulating cover 21 is mounted on the insulating frame 6, a screw 16 is inserted to prevent the insulating cover 21 from moving in the c direction so that the insulating cover 21 can be inserted into a groove (not shown) of the insulating cover 21.

[0016]

As described above, according to the invention of claim 1, three semi-cylindrical main bodies of the insulating frame are connected in the interphase direction to cover the vacuum switch tube housed therein. However, by making the insulating frame a semi-cylindrical shape, it is possible to secure a sufficient distance for the creepage distance, and thus it is possible to prevent deterioration of the insulation performance of the creepage surface. According to the invention of claim 2, since the fixed portion of the vacuum switch tube is covered with the dome-shaped cover, the dust-proof effect to the vacuum switch tube and the dome shape can prevent the attachment of water droplets. It is possible to prevent deterioration of insulation performance on the surface. According to claim 3, the insulating structure is divided into two, that is, the insulating frame and the insulating cover are made of the same insulating material.
The work of mounting the vacuum switch tube can be easily assembled. Moreover, the structure is such that the charging part including the vacuum switch tube cannot be touched, so it is safer than before. Further, since the contact surface is provided on the insulating frame so that the insulating cover is not deformed or broken, the insulating cover can be prevented from cracking.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a side view seen from II-II in FIG.

FIG. 3 is a bottom view of FIG. 1.

FIG. 4 is a perspective view seen from the right side of FIG.

5 is a perspective view seen from the left side of FIG.

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

FIG. 7 is an explanatory diagram when a vacuum switch is in a closed state.

FIG. 8 is an explanatory diagram showing a drainage state of the upper surface of the insulating frame.

FIG. 9 is a perspective view of an insulating cover.

FIG. 10 is a diagram showing a state in which an insulating cover is attached to an insulating frame.

FIG. 11 is a perspective view of a conventional switch.

FIG. 12 is a perspective view of a conventional switch.

FIG. 13 is a perspective view of a conventional switch.

FIG. 14 is a perspective view of a conventional switch.

FIG. 15 is a perspective view of a conventional switch.

[Explanation of symbols]

1 Insulation Frame 2 Vacuum Switch Tube 3 Upper Terminal 4 Lower Terminal 5 Lower Terminal Mounting Bolt 6 Insulation Frame 7 Upper Terminal Stopper 8 Contact Rod 9 Contact Spring 10 Flexible Conductor 11 Insulation Crossbar 12 Drive Shaft 13 Stopper 14 Spring 15 Bearing 17 Operation Mechanism 18 Auxiliary Switch 19 Auxiliary Switch Drive Lever 20 Terminal Block 21 Insulation Cover 22 Crossbar

Claims (3)

[Claims] 1. An insulating frame of a switch which houses and holds a switch part and which supports switch terminals connected to both ends of the switch part, wherein each phase has a substantially cylindrical capsule shape. An insulating frame for a switch, characterized in that the switch terminal is led out from the portion, and the cylindrical axes of the respective phases are parallel to each other and juxtaposed to each other to be integrally formed. 2. An insulating frame of a switch which houses and holds a switch part and supports switch terminals connected to both ends of the switch part, wherein each phase has a substantially cylindrical capsule shape. The switch terminal is led out from the portion, the cylindrical axes of the respective phases are parallel to each other and juxtaposed to each other to be integrally formed, and at least the end portion on the switch mounting side in the longitudinal direction of the cylinder is formed into a dome shape. An insulating frame for switches, which is characterized in that 3. An insulating frame of a switch which houses and holds a switch part and which supports switch terminals connected to both ends of the switch part, wherein each phase has a substantially cylindrical capsule shape. A first capsule in which a switch terminal is led out from a portion, cylindrical axes of respective phases are parallel to each other and juxtaposed to be integrally formed, and a surface opposite to a lead-out direction of the switch terminal is a release surface. An insulating frame for a switch, characterized in that it comprises a portion and a second capsule portion that covers the release surface of the first capsule portion.