JPS6328508Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a box-type high voltage cutout with a built-in current limiting element unit.In particular, the current limiting element can be easily assembled (built-in), and the contact between elements and between elements and terminals is good. The present invention relates to a high-voltage cutout with a built-in current-limiting element that maintains the current level.

In Utility Application No. 56-73011 "High Voltage Cutout with Built-in Current Limiting Element" proposed by the applicant earlier, the current limiting element and both upper and lower terminals are separately housed in the housing part of the main body insulator, so In addition to being troublesome to assemble, there is also the problem that if strong vibrations are applied, rattling may occur, leading to poor contact or damage to the element.

The present invention is intended to solve these problems, and a bag-shaped storage part 1 is provided at the lower rear of the main insulator 1, and is integrated with the main insulator 1 and is closed at the front and opened at the rear.
Further, in the above-formed storage section 1c, there is a relay conductor 2 located at the innermost part 1f thereof and connected to the lower fixed contact 5 of the lower recessed cutout 1b of the main insulator 1.
0 and 21, and the storage part 1c further includes a current limiting element 24 having voltage non-linearity, upper and lower terminals 25 and 26 connected to both upper and lower end surfaces of the current limiting element 24, respectively, and upper and lower terminals. The current limiting element unit 23 is made up of both terminals 25, 26 except for a part of the current limiting element 24, and an insulator 27 that integrally covers and molds the outer peripheral surface of the current limiting element 24 , with the upper terminal 25 facing forward and the lower terminal facing backward. 26 is stored with the rear opening end 1e side, and an annular fixing fitting 29 is fixed to the outer periphery of the rear opening end 1e of the storage part 1c, and a cap fitting 32 is screwed to the fitting 29. The opening end 1e is closed, and a coil spring 33 in a compressed state is disposed between the lower terminal 26 and the cap fitting 32.
The present invention proposes a box-shaped high-voltage cutout with a built-in current-limiting element unit, which is characterized by interposing a connecting conductor 34 connected in parallel to the current-limiting element unit.

Hereinafter, embodiments of the present invention will be described based on the drawings. Reference numeral 1 denotes a main body insulator, and as is well known, upper and lower arc extinguishing devices 2 and 3 are fixed to upper and lower recessed portions 1a and 1b, respectively.

4 and 5 are upper and lower fixed contacts of arc extinguishers 2 and 3 ;
6 and 7 are also upper and lower arc extinguishing chambers, 8 and 9 are also upper and lower wire connection terminals, 10 and 11 are also upper,
The lower fixing metal fitting 12 indicates an adhesive for fixing the arc extinguishing devices 2 and 3 .

Reference numeral 13 denotes a lid which is pivotally attached to the main body insulator 1 by a shaft 14 piece 14 so as to be openable and closable. On the inner surface of the kneading body, there is provided a lid that protrudes downward corresponding to the above-mentioned upper and lower fixed contacts 4 and 5. Moreover, a fuse tube 17 having lower movable contacts 15 and 16 is removably provided.
Reference numeral 18 indicates a fuse loaded to connect the upper and lower movable contacts 15 and 16. In addition, when opening the electric circuit in the above, if the hook portion 13a provided on the outer surface of the lid glass 13 is hooked with a separately prepared operating rod and pulled downward, the shaft 14 can be opened.
The lid glass 13 is centered on the fuse tube 17.
At the same time, the upper and lower movable contacts 15 and 16 of the fuse tube 17 are rotated clockwise, and the upper and lower movable contacts 15 and 16 are separated from the upper and lower fixed contacts 4 and 5, and the electric circuit is opened.

Note that when the lid is opened, the upper and lower movable contacts 15 and 16 are inserted into the upper and lower fixed contacts 4 and 5, and the electric circuit is closed. 19 is a rear opening 13b of the lid glass 13
A shielding plate made of an insulating material such as flame retardant and insulating rubber or synthetic resin is attached to the rear of the main insulator 1 to close the main insulator 1, and 1c is a shield plate attached to the lower part of the main insulator 1 adjacent to the lower concave cutout 1b. It is a bag-shaped storage part integrally formed at the rear, and the front part is closed and the rear part is open, and the opening end 1e is formed to have approximately the same length as the opening 13b of the lid glass 13. The relay conductor 21 is inserted into the innermost part 1f of the storage part 1e from the open end 1e side of the storage part 1c, and the relay conductor 21 is inserted into the through hole 1d from the lower recessed part 1b side and the threaded part at the tip is inserted as described above. A screw-shaped relay conductor 20 screwed into the threaded portion 21a of the relay conductor 21 and connected integrally is provided.

22 is a connection plate made of a phosphor bronze plate fixed to the head of the relay conductor 21, and the same plate is connected to the lower arc extinguishing device 3.
is in elastic contact with the lower side of the lower fixed contact 5.

Further, 23 is a current-limiting element unit, which includes a current-limiting element 24 which has voltage non-linearity and whose main component is zinc oxide (ZnO), and an upper terminal 25 and a lower terminal connected to both end faces of the element 24, respectively. It is composed of a terminal 26 and an insulating material 27 such as synthetic resin or rubber that integrally covers and molds the outer peripheral surfaces of both terminals 25 and 26, excluding a portion of the upper and lower terminals 25 and 26, and the current limiting element 24. The element unit is inserted into the housing part 1c with the upper terminal 25 side facing forward, and is inserted until the upper terminal 25 comes into contact with the relay conductor 21 at the innermost part 1f. 28 is a recess 27 around both terminals 25 and 26
A silicone-based filler is injected into a to seal the terminal portion, 29 is a fixing fitting fixed to the outer peripheral surface of the open end 1e of the storage portion 1c with an adhesive 30 such as cement, and 32 is a The fixing fitting 29 is screwed into threaded portion 29a of the fixing fitting 29 that protrudes rearward.
31 is a cap metal fitting designed to close the opening of the storage portion 1c, that is, the opening end 1e of the storage portion 1c.
The gas-tight seals 33 and 34 interposed between the cap metal fitting 32 and the fixing metal fitting 29 are connection conductors made of a coil spring and an elastic member interposed between the cap metal fitting 32 and the lower terminal 26.
When the coil spring 33 and the connecting conductor 34 are screwed together, the coil spring 33 and the connecting conductor 34 are compressed, and the upper terminal 25 of the current limiting element unit 23 is connected to the relay conductor 21.
Also, the lower terminals 26 are pressed into contact with the cap fittings 32, respectively. 35 indicates packing interposed between the cap metal fitting 32 and the fixing metal fitting 29. Reference numeral 32c denotes a protruding discharge portion located at the center of the outer surface 32d of the cap metal fitting 32 and protruding rearward, and the same portion forms a discharge gap G opposite to the other end 36a of the mounting metal fitting 36.

36 is positioned by being fitted into the guide protrusion 1h formed on the upper surface 1g of the main insulator 1, and its one end 36b is attached to the support bolt 37, and the other end 36a is extended to the rear of the housing portion 1c as described above. This is a mounting bracket, and when the cutout is attached to the arm of a utility pole, it is attached to the arm that is already grounded, so it is grounded via the arm. 38 is an insulating material such as rubber or synthetic resin having flame retardant and insulating properties, which is applied to the open end 1e of the storage portion 1c so as to cover the outer peripheral surface of the cap metal fitting 32 except for the discharge portion 32c of the cap metal fitting 32. The cap-shaped insulating cover has a cylindrical discharge hole 38a projecting rearward corresponding to the discharge portion 32c. Note that the tip of the hole 38a is widened into a tangle-like shape so that rainwater or the like does not stagnate inside the hole. Reference numeral 39 indicates a silicone-based filler which is injected into the gap in the storage portion 1c as needed.

Now, in the cutout constructed as described above, since the discharge gap G is in an insulated state in normal times, current is supplied through the same electric path as in a general high voltage cutout.

Furthermore, when a lightning surge enters, a flashover discharge occurs first in the discharge gap G, and the surge is transmitted between the upper wire connection terminal 8 - upper fixed contact 4 - upper movable contact 15 - fuse 18 - lower movable contact. 16 - Lower fixed contact 5 - Connection plate 22 - Relay conductor 20 - Relay conductor 21 - Upper terminal 25 - Current limiting element 24 - Lower terminal 26 - Coil spring 33,
A discharge is made to the ground via the connecting conductor 34 - cap metal fitting 32 - discharge gap G - mounting metal fitting 36 - arm of the utility pole, and the pole-mounted transformer is protected from dielectric breakdown due to lightning surge.

The present invention has the above-mentioned structure, and since the current limiting element and the upper and lower terminals are integrally coated and molded with an insulating material to form a unit, good contact between the elements and between the terminals and the elements is achieved. It also becomes easier to handle during assembly, etc. Furthermore, by improving airtightness, deterioration in insulation due to moisture or the like can be prevented. In addition, after the current limiting element unit is stored in the storage part, it is attached by screwing the cap metal fitting to the fixed metal fitting fixed to the open end of the storage part, but in this case, there is a gap between the lower terminal of the unit and the cap metal fitting. Since a coil spring is interposed in a compressed state and a connecting conductor is connected in parallel to the spring, even if the coil spring has an appropriate pressing force between the upper terminal and the relay conductor, and between the lower terminal and the cap fitting, A good current-conducting state is maintained by making contact with each other. At the same time, even if vibration is applied due to the presence of the coil spring, the influence of the vibration is absorbed by the spring, so that the current limiting element unit is not inadvertently damaged, and each component in the housing is This is practically effective as it can prevent collisions between the two.

[Brief explanation of the drawing]

The drawing shows a longitudinal sectional view of a box-shaped high-voltage cutout with a built-in current-limiting element unit, which is an embodiment of the present invention. 1...Body insulator, 1a...Lower concave notch, 1b...
...Top concave notch, 1c...Storage section, 1e...Opening end, 1f...Innermost part, 2 ...Top arc extinguishing device, 3 ...
... lower arc extinguishing device, 4 ... upper fixed contact, 5 ... lower fixed contact, 6 ... upper arc extinguishing chamber, 7 ... lower arc extinguishing chamber, 8 ... wire connection terminal, 9 ... lower wire connection terminal , 13... Lid glass, 15... Upper movable contact,
16...Lower movable contact, 17...Fuse tube, 1
8... Fuse, 23 ... Current limiting element unit, 2
4...Current limiting element, 25...Upper terminal, 26...Lower terminal, 27...Insulator, 29...Fixing metal fitting, 3
2...Cap metal fitting, 32c...Discharge part, 33...
...Coil spring, 34...Connection conductor, 36...
...Mounting bracket, 36a...other end, 36b...one end,
37...Support bolt, 38...Insulation cover, G...
...discharge gap.

Claims (1)

[Scope of utility model registration request] At the rear of the lower part of the main insulator 1, there is a bag-shaped storage section 1c which is closed at the front and opened at the rear integrally with the main insulator 1.
Further, in the storage portion 1c formed above, there is a relay conductor 20 located at the innermost portion 1f thereof and connected to the lower fixed contact 5 of the lower recessed notch 1b of the main body insulator 1.
21, and further includes a current limiting element 24 having voltage non-linearity and a current limiting element 24 in the storage part 1c.
Both upper and lower terminals 2 are connected to the upper and lower end surfaces of the
5, 26, and an insulator 27 that integrally covers and molds the outer peripheral surface of the current limiting element 24 with these terminals 25, 26 excluding a part of both the upper and lower terminals, and the upper terminal 25. is stored with the rear lower terminal 26 facing forward and the rear opening end 1e side, and an annular fixing fitting 29 is fixed to the outer periphery of the rear opening end 1e of the storage portion 1c,
Furthermore, a cap metal fitting 32 is screwed onto the metal fitting 29 to close the opening end 1e, and a coil spring 33 in a compressed state is disposed between the lower terminal 26 and the cap metal fitting 32.
A box-shaped high-voltage cutout with a built-in current-limiting element unit characterized by interposing a connecting conductor 34 connected in parallel to the current-limiting element unit.