JPS6037794Y2 - Built-in arrester type high voltage cutout - Google Patents

Description

[Detailed description of the invention] This project relates to the improvement of a high-voltage cutout with a built-in arrester, and especially in the case of a structure in which the arrester is built into the main body, the shape is compact so that it is not so large compared to a general type high-voltage cutout. In summary, the present invention relates to a structure that can be easily used by using the same mounting method as a general type high-voltage cutout that does not have a built-in arrester.

In recent years, high-voltage cutouts with built-in arresters have been used on the primary side of pole-mounted transformers of high-voltage distribution lines as part of snow damage countermeasures in lightning-struck areas.

In this case, the conventional high-voltage cutout with a built-in arrester divides the expanded porcelain body 100 into two parts, as shown in FIGS. and the other arrester storage section 10
2 houses an arrester 103.

However, in the cutout described above, not only is the main body 100 large, but also the arrester protrudes from the rear of the main body (the main focus was simply on combining the cutout and the arrester), thus avoiding an increase in size and weight. In addition, there are problems in use, such as the need to connect the ground point 104 during installation, which is significantly different from the membrane type.

Furthermore, since the arrester housed within the main body is connected to the upper contact of the opening/closing element, if the characteristic element were to deteriorate, it would not be possible to block the follow-on current, and there was a risk that the cutout would explode.

This proposal is intended to solve these various points, and its configuration is that arc extinguishing chambers 2,
2. Fixed contacts 3a, 3b and wire connection terminals 4a, 4b
The arc extinguishing devices 5a and 5b are respectively fixed, and the cover body 7 is pivoted to the main body 1 so as to be openable and closable, and the cover body 7 has a movable member that is inserted into or removed from the fixed contacts 3, 3 when the cover body 7 is opened and closed. In a high-pressure cutout in which the lid body is equipped with a fuse tube 11 having integrally protruding contacts 12a and 12b, the front part 1f is closed at the rear of the lower part of the body adjacent to the lower concave cutout 1b of the body 1. A bag-shaped arrester whose rear 1g is open, whose rear end 1d is extended to approximately the same extent as the rear end 7a of the lid 7, and whose upper surface 1e is on the same line as the upper surface 1e' of the main body 1. A storage portion 1C is provided integrally with the main body 1, and the storage portion 1c is filled with zinc oxide (Z).
A characteristic element 19 having non-linearity whose main component is nO) is housed, and one end of the housed element is led out through a through hole 1h provided in front of the housing part through a terminal bolt 15, and then connected to the lower recessed part. The rear end 1d of the turning part is connected to the fixed contact 3b in 1b, and the other end of the element is connected to the fixed contact 3b in 1b to close the storage part 1c.
The outer peripheral surface of the cap metal fitting 24 is covered with an insulating cover 27 except for the discharge electrode 28 provided on the metal fitting.
Reference numeral 8 is attached to the upper surface 1e' of the main body 1, and its tip is opposed to a grounding fitting 29, which is extended to the vicinity of the rear end 1d of the housing portion 1c, through a discharge gap G. This project proposes a high-voltage cutout with a built-in arrester.

Hereinafter, an embodiment of the present invention will be described in detail based on FIGS. 3 and 4.

Reference numeral 1 denotes a main body made of porcelain, and the main body 1 includes an upper recessed recess 1a, a lower recessed recess 1b, and an arrester storage IC.In the upper recessed recess 1a and the lower recessed recess 1b, there is an arc extinguishing chamber 2. ,2
An arc extinguishing device 5a consisting of fixed contacts 3a, 3b, and wire connection terminals 4a, 4b.

5b are fixed to each other.

Reference numeral 7 designates a lid body made of porcelain which is pivoted to be openable and closable by a pin 8, and a fuse tube 11 is removably attached to the lid body by a fitting metal fitting 9 and an elastic engagement piece 10.

12a and 12b are movable contacts that are integrally protruded from the fuse tube 11 and correspond to the above-mentioned upper and lower fixed contacts 3a and 3b, respectively, and are inserted into the fixed contacts when the lid is opened, and detached when the lid is opened to open and close the electric circuit. I do.

Reference numeral 13 indicates a fuse loaded in the fuse cylinder 11.

Reference numeral 14 denotes a connecting fitting which has the function of electrically connecting the fixed contact 3b of the lower arc extinguishing device 5b and a terminal bolt 15 to be described later, and at the same time fixing the arc extinguishing device together with the fixed leg 16, and is connected to the terminal bolt 15. The bolt 15 is bent perpendicularly to a notch (not particularly shown) that allows the bolt to be inserted.
It is provided with a rotation stopper portion 14a that is engaged with the rotation stopper portion 14a.

17 is a connecting fitting 14, a lower fixed contact 3b, and a wire connecting terminal 4b.

A rivet that fixes the fixed leg 16 together.

Reference numeral 6 denotes a fixing leg for fixing the upper arc extinguishing device 5b in the upper concave notch 1a of the main body 1, and is fixed by an adhesive 18.

Reference numeral 1c denotes a bag-shaped arrester storage part located at the lower rear of the main body and formed integrally with the main body 1, with the front part 1f closed and the rear part 1g opened.
It extends rearward to approximately the same level as the rear end 7a, and the upper surface 1e is formed to be on the same line as the upper surface 1e' of the main body, making the overall shape of the cutout approximately square and compact.

Reference numeral 19 is a characteristic element having non-linearity stored in the arrester storage part 1c, which is mainly composed of zinc oxide (ZnO) and also contains cobalt oxide (COO) and bismuth oxide (Bi).
A small amount of metal oxide such as b) is added and mixed, formed into a prismatic shape, and further heated at 1200°C to 1300°C.
It is fired at a high temperature of .degree. C., and in the embodiment of the present invention, two of these characteristic elements 19 are housed in series.

Reference numeral 15 denotes a terminal bolt which is inserted into the through hole 1h of the inner surface lf' from the storage part 1c side through the airtight bushing 20, and whose tip protrudes from the through hole 1h toward the lower recessed notch 1b side. A cap-shaped terminal fitting 21 that fits into the head of the terminal 15 is fastened and fixed to the front inner surface 1f'.

22 is a flexible filler that maintains the airtightness of the through hole 1h together with the airtight bushing 20.

23a. Reference numeral 23b denotes cap-shaped contact fittings that are in close contact with both end faces of the characteristic element, one of which contacts the terminal bolt 15 on the charging side via the contact fitting 21, and the other contacts the cap fitting 24 on the grounding side via the coil spring 33. are in contact with each other.

Reference numeral 24 denotes a cap fitting that closes the rear end 1d of the opening storage part, and inside it is a energized member that urges the characteristic element 19 forward to hold the element and also makes tight contact between each contact surface. A coil spring 33, which also serves as a member (current conducting path), is interposed in a compressed state.

26 is an O-ring for sealing interposed between the cap metal fitting 24 and the rear end 1d, and 27 is an insulating cover attached to the metal fitting so as to cover the outer peripheral surface of the cap metal fitting 24, and is provided with a small hole 27a for a discharge electrode. There is.

Reference numeral 28 denotes a grounding fitting 2 which is attached to the back surface 1e' of the main body 1 and whose tip extends to the vicinity of the rear end 1d of the main body 1.
9, and the discharge electrode 28 faces the grounding fitting 29 on the main body side through the discharge electrode small hole 27a of the insulating cover, so that a discharge gap G is formed between the two. There is.

30 is a support fitting for attaching the high-voltage cutout to the cross arm; 31 is a support bolt grafted onto the upper surface le' of the main body 1;
32 indicates a mounting nut screwed onto the support bolt.

In the above configuration, under normal conditions, the wire connection terminal 4a - fixed contact 3a - movable contact 12a - fuse 13 - fixed contact 3
The electric path of the b-wire connection terminal 4b is shaped.

Now, in this state, if a lightning surge enters, this abnormally high voltage will cause a flashover discharge in the discharge gap G.
Abnormal voltage is fixed contact 3b series connection fitting 14 - terminal bolt 1
5 - terminal fitting 21 - contact fitting 23a - characteristic element 19 - coil spring 33 - cap fitting 24 - discharge electrode 28
- discharge gap G - safely discharged to earth via grounding fitting 29;

In this case, since the characteristic element 19 uses a sintered body with excellent nonlinearity mainly composed of zinc oxide (ZnO), abnormal high voltage is immediately limited to a low level, and the pole transformer is protected from dielectric breakdown. be protected.

Furthermore, since this element has no follow current, there is no follow current due to the superposition of the commercial frequency.

Note that after the operation, the circuit returns to the above-mentioned normal state.

The present invention has the above-mentioned configuration, in which the arrester storage section is located at the rear of the lower part of the main body and is integrated with the main body, and the rear end of the storage section is extended to approximately the same extent as the rear end of the lid body. The overall shape of the cutout (which stores characteristic elements in the same storage area) is approximately square, making it even more compact.

In addition, the characteristic element 19 stored in the arrester housing has one end connected to a fixed contact at the bottom, and the other end connected to a cap metal fitting fixed to the outer periphery of the rear end of the rotating part in order to close the storage area. Since the discharge electrode 28 provided with the discharge electrode 28 faces the grounding metal fitting attached to the main body through the discharge gap, there is no need to connect an arrester, and it can be used in the same installation method as a general type high-voltage cutout that does not have a built-in arrester. can.

Furthermore, since the outer circumferential surface of the cap metal fitting fixed to the outer periphery of the rear end of the storage portion is covered with an insulating cover, it is safe even if the characteristic element (zinc oxide) deteriorates and becomes a charged state.

In addition, the characteristic element stored in the arrester's storage compartment is connected in series to the lower fixed contact on the cutout side, that is, the fuse on the cutout side, in the event of a lightning surge, so if the characteristic element is unable to interrupt the follow-on current. It has excellent features such as being able to block the follow-on current with a fuse, thereby preventing an explosion at the cutout.

[Brief explanation of the drawing]

Figures 1 and 2 show the state of use of a conventional high voltage cutout with a built-in arrester. An embodiment of the invention is shown, and FIG. 3 is a longitudinal sectional view of a high-voltage cutout with a built-in arrester, and FIG. 4 is a left side view of FIG. 3. 1...Main body, 1a...Soil part recess, 1
b...Lower concave notch, 1c...Arrestor storage area, 1d...Rear end, le, le'...
...Top surface, 1h...Through hole, 2...
Arc extinguishing chamber, 3a...Fixed contact, 3b...
Fixed contact, 5a... Arc extinguishing device, 5b...
- Arc extinguishing device, 7... Lid body, 7a... Rear end, 15... Terminal bolt, 19... Characteristic element, 24...・・Cap fitting, 27・・・・
...Insulation cover, 28...Discharge electrode, 29...
...Grounding fitting, G...Discharge gap.

Claims (1)

[Scope of utility model registration request] Arc extinguishing chambers 2.2 are provided in the upper and lower recessed portions 1a and lb of the main body 1,
Arc extinguishing devices 5a and 5b each consisting of fixed contacts 3a and 3b and wire connection terminals 4at4b are fixed, and a cover body 7 is pivotally connected to the main body 1 so as to be openable and closable. In a high-pressure cutout equipped with a fuse cylinder 11 integrally protruding with movable contacts 12a and 12b that are inserted or removed when opening and closing, there is a front 1f at the lower rear of the main body adjacent to the lower recessed part 1b of the main body 1.
is closed, but its rear end 1g is open, and its rear end 1d
A bag-shaped arrester storage portion 1c is integrally provided in the main body 1, and the arrester storage portion 1c is extended to approximately the same extent as the rear end 7a of the lid 7, and the upper surface 1e is on the same line as the upper surface 1e' of the main body 1. At the same time, the housing part 1c stores a characteristic element 19 having non-linearity mainly composed of zinc oxide (ZnO), and one end of the stored element is led out from a through hole 1h provided in the front of the housing part. The terminal bolt 15 is connected to the fixed contact 3b in the lower concave notch 1b, and the other end of the element is connected to a cap metal fitting 24 fixed to the outer periphery of the rear end 1d of the rotating part in order to close the storage part 1c. At the same time, the outer peripheral surface of the cap metal fitting 24 is covered with an insulating cover 27 except for the discharge electrode 28 provided on the metal fitting.
It is attached to the upper surface le' and its tip is the above-mentioned storage part I.
A high-voltage cutout with a built-in arrester is characterized in that it is opposed to a grounding fitting 29 extending to the vicinity of the rear end 1d of C, with a discharge gap G interposed therebetween.