JPS6115543B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an air vent or disconnect switch, particularly an air vent or disconnect switch in which only the main circuit conductive part and the arc extinguishing chamber excluding the external connection terminal part are housed in a molded insulating container. It is related to vessels.

Conventionally, air vents and disconnectors have an open structure for ease of maintenance and inspection, so the dielectric strength between the conductive part and the mechanical part is relatively weak, especially when arcing occurs when opening and closing. Therefore, there is a risk of leakage current flowing into the mechanical part, and since the internal pressure does not increase when the insulation box is disconnected compared to an insulated box type circuit breaker, the disadvantage is that the insulation box breaker cannot have a large breaker capacity.

Therefore, an object of the present invention is to house only the main circuit conductive part and the arc extinguishing chamber, excluding the external connection terminal part, in a molded insulator container in order to eliminate the drawbacks of the conventional method. The generated arc and gas are blocked by the molded insulator container, increasing the internal pressure, and the arc is forced to flow to the arc extinguishing device gasdynamically, increasing the cooling effect and improving insulation recovery after passing the zero point. To provide an air vent or disconnector which is improved and capable of supplying or breaking a large current in an arc extinguishing chamber that is smaller than conventional open type ventilators or disconnectors.

Another object of the present invention is to house the contacts between the contacts and the arc extinguishing device in a molded insulating container, so that the mechanical part and the conductive high temperature gas that occur when a large current is interrupted can be removed. It is an object of the present invention to provide an air vent or disconnection device that prevents the spread between other poles and enables safe disconnection.

Furthermore, another object of the present invention is that the molded insulator container houses only the main circuit conductive parts and the arc extinguishing chamber, excluding the connection terminal parts, so that it is dimensionally small and reduces molding mold manufacturing costs and molding insulation. An object of the present invention is to provide an air vent and a disconnector that can reduce the manufacturing cost of containers.

Furthermore, although the operating mechanism and control device of the air disconnector and disconnector of the present invention are exposed outside the molded insulator container, they are insulated from the main circuit and effectively grounded, making them easy to handle. It has the advantage that there is little risk of the above, there are few dimensional restrictions, and it is easy to adapt to a variety of specifications.

Furthermore, in the insulator and disconnector of the present invention, the arc extinguishing device of the molded insulating container can be separated from the conductive part cover and the mold base with screws, which provides another advantage of facilitating the inspection of the contacts. have.

Other objects and features of the invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

As shown in FIGS. 1 to 3, the air cutter and disconnector of the present invention has a fixed main contact as a contact device.
and fixed arcing contact 2 are power supply side terminal 3
The movable main contact 4 and the movable arcing contact 5 are mounted on the movable contact holder 6 so as to face the fixed main contact 1 and the fixed arcing contact 2, and contact pressure is applied by a contact spring. The movable contact holder 6 is rotatably supported by a movable contact holder support plate 8 by a movable contact holder shaft 7. One end of the load side terminal 9 is connected to the movable main contact 4 and the movable arcing contact 5 via a flexible lead plate 10 and a flexible lead plate mount 11. One end of the contact lever 12 is connected to the movable contact holder 6 of each pole, and the other end is integrally connected to an operating rod 13 made of an insulating material via a connection adjustment bolt 14.

The arc extinguishing device 15 includes an arc extinguishing grid 16, an arc gas mixing chamber 17, and an arc gas cooling wire mesh 18.
It is provided within an arc extinguishing chamber cover 19 made of a molded insulator. A mold base 21 made of a molded insulator is attached to the fixed frame 20, and a power supply side terminal 3, a movable contact holder support plate 8, and a load side terminal 9 are attached to this mold base 21.

Conductive part cover 22 that covers the contact device from the front part
is the mold base 21 as clearly shown in FIG.
Partition partition walls 21a, 21b, 21c, 2 of each pole of
1d and the partition wall 22 of each pole of the conductive part cover 22
a, 22b, 22c, and 22d are abutted against each other and are integrally attached using attachment screws 23, thereby forming a storage container for the conductive portion with one end closed and the other end open. Furthermore, the leg pieces 19a of the arc extinguishing chamber cover 19 are inserted into the grooves on the opening side of the storage container and are integrally attached to the conductive part cover 22 with attachment screws 24. Therefore, except for the external connection terminals of the power supply side terminal 3 and the load side terminal 9, the main circuit conductive part and the arc extinguishing chamber are connected to the mold base 21, the conductive part cover 22, and the arc extinguishing chamber cover 19 so as not to create a gap. It is housed in a molded insulator container formed by. By increasing the thickness of such a molded insulator container or using reinforced plastic, it is possible to provide it with strength to withstand the internal pressure caused by the arc at the time of burnout.

The instantaneous overcurrent tripping device 25 is arranged such that a fixed core 36 forming an electromagnet winds around a load-side terminal 9 forming a main current conductor.

The operating rod 13 of each pole led out from the window hole 26 of the conductive part cover 22 is connected to the connector lever 29 and the upper toggle link 30 of the operating mechanism section 28 via a shaft 27, and is connected to each operating mechanism member connected thereto. The opening/closing operation is then performed. Further, the operating rod 1 is guided out from the window hole 26 of the conductive part cover 22.
3, an enlarged umbrella part 13' is integrally formed inside the conductive part cover 22, and there is little gap between the enlarged umbrella part 13' and the inner surface of the conductive part cover 22 during the opening/closing process of the enlarged umbrella part 13' of the operation rod 13. A thick portion 22a is provided on the inner surface of the conductive portion cover 22 to prevent leakage of arc gas from the window hole 26. That is, the molded insulator container provided here increases the internal pressure of the arc gas between the contacts as the arc occurs, and this gas-dynamically forces the arc extinguishing grid 16 of the arc extinguishing device 15 and the arc gas mixing chamber. 17 and then through an exhaust hole equipped with an arc gas cooling wire mesh 18, the contact housing portion of the molded insulator container must have as small a volume as possible, and must not have unnecessary openings or gaps.
The window hole 26 passing through the operating rod 13 must be as small as possible, and must have a large fluid resistance in order to prevent gas from leaking from the periphery of the operating rod 13 as much as possible. Further, the air cutter and disconnector of the present invention is equipped with an electromagnetic closing device 31 and a tripping device 32.

As described above, the air cutter or disconnector of the present invention has a pair or several pairs of contact devices that can be brought into contact with and separated from each other, and the main circuit conductive portion excluding the external connection terminal portion and the contact device are An arc extinguishing device for extinguishing the arc generated when the arc is cut is housed in a molded insulating container for each pole or for each pole as a unit, and is housed in a molded insulator container that is integrally formed with multiple poles. In addition, the control device and the rotating frame that supports them are installed outside the molded insulator container, so if a large current flows through a closed circuit or disconnector during a short circuit, the overcurrent tripping device will be activated. Upon activation, the contact device dissociates, an arc is generated between the fixed arcing contact 2 and the movable arcing contact 5, and the gas caused by this arc rapidly increases the internal pressure inside the molded insulator container. Since the opening is provided only in the upper part of the arc extinguishing chamber, a gas flow is rapidly generated toward this part, and the arc is blown onto the arc extinguishing grid 16, thereby increasing the arc extinguishing effect.

Therefore, the rated short-time current and the rated disconnection current of the air disconnection switch of the present invention are substantially the same as those of the conventional circuits, but the rated disconnection current can be considerably increased compared to the rated short-time current and the rated disconnection current.

[Brief explanation of the drawing]

The drawings show an embodiment of the circuit breakers and disconnectors of the present invention, and FIG. 1 is a partial side sectional view of the circuit breakers showing the open circuit state, and FIG. 2 shows the circuit breakers showing the closed circuit states. FIG. 3 is a side sectional view of the main part of the disconnector, and FIG. 3 is an assembled perspective view showing the molded insulator container. In the figure, 1... Fixed main contact, 2... Fixed arcing contact, 3... Power side terminal, 4... Movable main contact, 5... Movable arcing contact, 6...
Movable contact holder, 9...Load side terminal, 12...
Contact lever, 13... Operating rod, 15... Arc extinguishing device, 16... Arc extinguishing grid, 19... Arc extinguishing chamber cover, 20... Fixed frame, 21... Mold base, 22... Conductive part cover, 25... Overcurrent instantaneous tripping Device, 26... Window hole, 28... Operation mechanism section, 31...
Electromagnetic closing device, 32...trip tripping device.

Claims (1)

[Claims] 1 Each pole has a contact device that can be electrically contacted and disconnected from each other, and the main circuit conductive part excluding the external connection terminal section and the arc that occurs when the contact device interrupts the current. an arc extinguishing device for extinguishing an arc, and each pole is housed in a molded insulator container comprising at least a base and a cover, and the contact device is made of an insulator passing through a hole in the wall of the molded insulator container. A fixed frame connected to the operating mechanism section by a rod and supporting the operating mechanism section, the control device, and the like is provided outside the molded insulator container in a state insulated from the main circuit, and the extinguisher of the insulator container An exhaust hole is provided at one end portion housing the arc device, and means is provided for restricting arc gas flow to a gap formed between the operating rod and a hole in the wall of the insulator container through which the operating rod passes, and The container is formed to be substantially airtight except for the exhaust hole, and the portion of the molded insulator container housing the contact device has a substantially minimum volume that allows movement of the entire movable contact device in the event of a large current interruption. An air vent or disconnection device characterized in that the insulating material container instantaneously forms a pressure chamber.