JPH037006Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to the improvement of pole-mounted switches used in high-voltage distribution lines, especially when an internal short-circuit accident occurs due to abnormal voltage such as lightning surge. This invention relates to a structure that allows the pressure inside the case, which has suddenly increased, to be safely released to the outside of the case.

(Problems with the Prior Art) In high-voltage power distribution lines, automatic segmentation switches for fault classification detection are arranged on utility poles at various locations.
This automatic sectional switch can not only be used to open and close electrical circuits manually (operating handle), but also by commands from the substation.

By the way, this automatic section switch generally has the following structure.

In other words, it has an integrated structure in which an upper switch case that houses the arc extinguisher is connected to an operation mechanism case that is located below and houses a drive device that drives the arc extinguisher.

If an internal short circuit occurs in the switch case due to abnormal voltage such as a lightning surge, the increased pressure is released to the outside of the case from a pressure release guide provided on the top of the case.

However, with the above structure, if left unused for a long period of time after pressure release, rainwater may enter the case from the pressure release guide, birds or snakes may enter, and secondary problems such as ground faults and short circuits between phases may occur. This could lead to serious accidents.

Additionally, if an internal short circuit occurs inside the case, arcs, pressure, and flying objects will be violently ejected toward the bottom of the case, causing a negative impact on people and vehicles passing below the switch, resulting in a lack of safety. However, it got hot.

(Specific Means for Solving the Problems) The present invention is intended to solve such problems. The planar upper surface 3 of
The operation mechanism case 3 is positioned below the upper switch case 2 so that the upper switch case 2 approaches and faces parallel to form a pressure relief space a, and the operation mechanism case 3 is combined with the bottom surface of the switch case 2. 2d is provided with a pressure relief guide section 26 made of a V-groove or thin wall that ruptures due to pressure increase during an internal short circuit, and a frame-shaped metal frame is provided in the pressure relief space a so as to surround the pressure relief guide section 26. The present invention proposes a pole-mounted switch characterized by being provided with a protective net 35.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. 1 shows a pole-mounted switch equipped with a gas blowing arc extinguishing device.A box-shaped switch case 2 is located at the top, and a box-shaped operating mechanism case 3 is located at the bottom. Connected and combined.

When combined, the planar top surface 3a of the operating mechanism case 3 is placed close to and opposite to the planar bottom surface 2d of the switch case 2, and a gap-like pressure relief space is created between the two. They are connected to form a.

The switch case 1 is made of a material with excellent corrosion resistance such as stainless steel, and the lid part 2a is welded to the inside of the main body 2b at the final stage of assembly to maintain the airtightness of the case. A gas blowing type arc extinguishing device 4 is provided within the main body portion 2b.

The gas blowing type arc extinguishing device 4 consists of a piston 5 and a cylinder 6 made of an insulating material such as epoxy resin, and a tube-shaped movable electrode 8 is provided on the nozzle 7 side of the piston 5. Reference numeral 9 denotes a drive lever for driving the piston 5, which is connected to a drive device 10 housed in the operation mechanism case 3 and the operation handle 3.
It is connected to 4. Reference numeral 11 indicates a connecting shaft connecting the drive device 10 and the drive lever 9, and 12 indicates a bellows. 14 and 15 are side surfaces 2c and 2c of the main body portion 2b.
A bushing is inserted through the bushing, and rod-shaped fixed electrodes 16 and 17 are respectively inserted and fixed in the center of the bushing, and these fixed electrodes are linearly opposed to each other. 18 is a presser metal fitting for attaching the bushing,
Reference numeral 19 denotes an airtight insulator tube made of alumina porcelain, and the insulator tube is sealed to the fixed electrodes 16, 17 and the main body 2b with metal pieces 20 such as Kovar. 21 and 22 are stress cone-shaped lead wires adhesively fixed to the tip of the bushing, and the fixed electrode 1
It is connected to 6 and 17. 23 is a detection bellows that detects gas leakage, that is, a reduced pressure state of gas pressure in the switch case; 24 is a transmission shaft 2 of the bellows 23;
5 and a protective tube made of rubber that protects the connecting shaft 11 is shown. Reference numeral 26 denotes a pressure relief guide section made of a V-shaped cut groove or thin wall provided on the bottom surface 2d of the switch case 2, and if an internal short circuit occurs within the case and the internal pressure of the case increases, this section will rupture. A pressure relief port is formed in the case to quickly release the pressure inside the case to the outside of the case. 27, 27 are bolts 29 and nuts 3 on both external sides of the main body 2b.
The connecting fittings are each attached by 0,
A hanging metal fitting 31 is attached to the upper part of the metal fitting that projects upward from the lid portion 2a, and the operating mechanism case 3 is connected to the lower part of the metal fitting that projects downward by bolts 32 and nuts 33 as described above.

Reference numeral 35 denotes a frame-shaped metal protective net attached to the pressure relief space a, which is made of a fine mesh metal net or, for example, punched metal with a large number of small holes 35a. 31 and a nut 32 to the external upper surface 3a of the operating mechanism case 3. Reference numeral 10 indicates a drive device housed within the operating mechanism case.

Next, the operation when an internal short circuit occurs within the switch case will be explained.

Now, when an internal short circuit occurs in the switch case due to abnormal voltage, the pressure relief guide part 26 provided on the bottom surface 2d ruptures due to the increased pressure inside the case, and a pressure relief port is immediately formed.

The arc, pressure, and flying objects emitted from the opening once collide with the top surface 3a and bottom surface 2d of the operating mechanism case, and their momentum is weakened. The weakened pressure is deflected and released to the side of the case through a gap-like pressure release space a formed between the bottom surface 2d and the top surface 3a. In addition, in this case, a frame-shaped metal protective net 35 is provided in the pressure relief space a to surround the pressure relief guide section 26 provided on the bottom surface 2d of the switch case, so that the arc and pressure are further weakened. . At the same time, the same net screens out flying debris. In this way, the pressure relief operation can be performed safely even in the event of an internal short circuit.

(Effects of the present invention) The present invention has the above-mentioned configuration, and even if an internal short circuit occurs in the switch case and the internal pressure of the case 2 suddenly rises, the present invention will be able to provide relief through the V-groove etc. provided on the bottom surface 2d of the switch case. Pressure guide part 26
A pressure relief port is immediately formed in the case, and the pressure inside the case is immediately released to the outside of the case, which of course prevents extreme deformation and damage to the case.
The arc and pressure released from the pressure relief guide section 26 are released into the pressure relief space a formed by the planar bottom surface 2d of the switch case 2 and the planar top surface 3a of the operating mechanism case 3, which are close to each other and face each other. and these upper surfaces 2
As it collides with d and the bottom surface 3a, its force is weakened and at the same time its ejection direction is deflected to the side of the safe case, so it will not have a negative impact on people, vehicles, etc. passing under the switch. . In addition, the arc and pressure released into the pressure relief space a are removed by the guide section 26.
A protective wire mesh 35 attached to the space a so as to surround the case further weakens the force, and at the same time, the mesh screens out the objects flying out of the case.
Further, since this net 35 is attached to the outside of the switch case, that is, in the pressure relief space a, damage to the net due to arcing or the like is prevented, and a reliable screen effect can be expected.

In addition, after the pressure relief operation, the pressure relief port of the pressure relief guide section 26 formed on the bottom surface 2d of the switch case is covered by the top surface 3a of the operation mechanism case 3, so that the intrusion of rainwater etc. can be prevented as much as possible, and re-shorting can occur. When releasing pressure in the event of an internal short circuit in a pole-mounted switch,
Safety after pressure release can be further improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and Fig. 1 is a front view of a pole-mounted switch with a part omitted, Fig. 2 is a side view of the pole-mounted switch, and Fig. 3 is a partially omitted view. A broken vertical sectional view and FIG. 4 show an enlarged sectional view of the vicinity of the pressure relief guide portion, respectively. 1...Pole-mounted switch, 2...Switch case, 2
d...Bottom surface, 3...Operation mechanism case, 3a...Top surface, 26...Pressure relief guide section, 35...Metal protection net, a...Pressure relief space.

Claims (1)

[Scope of utility model registration request] A planar bottom surface 2d of the box-shaped switch case 2 and a planar top surface 3a of the box-shaped operating mechanism case 3.
The operation mechanism case 3 is positioned below the upper switch case 2 so that the upper switch case 2 approaches and faces each other in parallel to form a pressure release space a, and the bottom surface 2d of the switch case 2 is combined with the operation mechanism case 3. is provided with a pressure relief guide section 26 made of a V-groove or thin wall that ruptures due to pressure increase during an internal short circuit, and a frame-shaped metal frame is provided in the pressure relief space a to surround the pressure relief guide section 26. A pole-mounted switch characterized in that a protection net 35 is provided.