JPH024435Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of a box-shaped high-voltage cutout that has an arrester built into the main body. ) and store it directly in this, thereby making the overall shape more compact.
It is also an object of the present invention to provide a cut-out with a novel structure that can be manufactured at low cost and further improve safety.

The primary side of pole-mounted transformers used on high-voltage distribution lines is equipped with a built-in arrester to more reliably protect the transformer from abnormal voltages such as lightning surges.
A high pressure cutout as shown in FIG. 2 is used. As can be seen from the figure, the main body 100 of a conventionally used general type box-shaped high-pressure cutout, that is, the main body 100 on the support fitting 101 side, is expanded to form a special bag-shaped storage section 102. It has a structure in which an arrester 103 is built in. This is because it can be handled and operated as before (because the opening/closing part is the same as the conventional general type), and because the arrester built into the storage section is a discharge type, its discharge tube 104 can be connected to the fuse tube 10.
This structure is due to the fact that it must be in the same direction (parallel) as the discharge port 106 of No. 5. For this reason, the main body made of porcelain has to be greatly expanded to provide the storage section as described above, which inevitably results in a large and complicated main body shape, and has disadvantages such as being heavy and expensive.

From an electrical point of view, the discharge cylinder of the arrester protrudes from the lower end of the main body and has a grounding terminal 107 at that part, which is connected to the support fitting by a connecting wire 108, and connected to an electric wire which is a live part for grounding. In some cases, the terminals 109, fuse leads 110, etc. were too close to each other, making it impossible to secure a sufficient insulation distance between the live parts and the ground.

This project was proposed in order to solve these various problems, and includes upper and lower double recessed recesses 3 and 4 adjacent to the central recessed recess 2 in the main body 1 made of porcelain at its upper and lower parts. Both upper and lower arc extinguishing chambers 7 and 1 are provided in the upper and lower double concave notches 3 and 4, respectively.
0, an arc extinguishing device 5, 12 consisting of upper and lower fixed contacts 6, 9 and upper and lower electric wire connection terminals 8, 11 is provided, and a lid 16 which is pivotally attached to the main body 1 so as to be openable and closable is provided with the upper and lower fixed contacts 6, 9. Both upper and lower movable contacts 21 and 22 are integrally provided to open and close the electric circuit by contacting or separating from the fixed contacts 6 and 9, and a fuse 23 is interposed between the upper and lower movable contacts 21 and 22, and a fuse tube 20 is provided. In the removable high-voltage cutout, a cylindrical insulating spacer 32 and the same spacer are located in the central concave notch 2 of the main body 1, which is formed between the upper and lower double concave notches 3 and 4. A discharge gap device consisting of discharge electrodes 26 and 29 provided oppositely at both ends of the spacer 32 so that a predetermined series gap 28 is formed between the protrusions 30 and 31 located within the spacer 32; An upper open end 53 of the concave notch 2 into which the elements 24 made of a sintered body mainly composed of zinc oxide and having non-linear resistance characteristics connected in series are inserted therein.
is closed with an insulating lid 55, and the discharge electrode 29 on the ground side of one of the recessed discharge gap devices is located below the central recessed part 2 and protrudes from the back surface 37 outside the main body 1. ground terminal 38
In addition, the charging side electrode 27 of the other element 24 is connected via the conductive plate 14 to the lower fixed contact 6 of the arc extinguisher 5 in the lower recess 3 provided adjacent to the central recess 2. It is characterized by being connected to each other.

Examples of the present invention will be described below.

Reference numeral 1 denotes a box-shaped main body made of porcelain, and inside the main body, there is a central concave notch 2, and an upper concave notch 3 and a lower concave notch 4 are formed adjacently above and below the central concave notch 2. There is. (As will be described later, these recessed parts are provided not only to simply accommodate the arrester, arc extinguisher, etc., but also to make the thickness of each part uniform in order to eliminate defects during firing.) Reference numeral 5 denotes an arc extinguishing device fixedly inserted into the upper concave notch 3, and is composed of an upper fixed contact 6, an upper arc extinguishing chamber 7, and an upper wire connection terminal 8. Furthermore, a lower fixed contact 9 is also provided in the lower concave notch 4. , a lower arc extinguishing chamber 10 , and a lower arc extinguishing device 12 consisting of a lower electric wire connection terminal 11 are each fixed with an adhesive 13 . 14 is a connecting conductive plate that electrically connects the lower fixed contact 9 and a charging side electrode 27 of the arrester 15, which will be described later.

Further, reference numeral 16 denotes a porcelain lid which is pivotally attached to the lid so as to be openable and closable by a shaft pin 17, and a fitting fitting 18 and an elastic engagement piece 19 fixed to the lid are used to connect the fuse tube 2 to the lid.
0 is removably attached. 21, 22
are an upper movable contact and a lower movable contact protruding from the fuse tube 20, and when the lid is closed or closed, both movable contacts are inserted into or separated from the upper and lower fixed contacts 6 and 9, respectively, to open and close the electric circuit. will be carried out.

Reference numeral 23 denotes a fuse mounted so as to be interposed between the upper movable contact 21 and the lower movable contact 22 of the fuse cylinder 20. 24 is a characteristic element (element) having a non-linear resistance characteristic that is embedded in the recessed part 2 in the center of the main body, and is formed into a predetermined shape such as a cylinder, a prism, or an annular shape, and then fired at a high temperature, and is made of zinc oxide ZnO. It consists of a sintered body as the main component.

Each end face 25 of the element 24 is baked with silver. Reference numerals 26 and 27 are electrodes that are pressed into close contact with both ends of the element 24, and one electrode 26 also serves as a discharge electrode on the charging side.

Reference numerals 26 and 29 denote a charging-side discharge electrode and a grounding-side discharge electrode that are provided opposite to each other on both upper and lower end surfaces of the cylindrical insulating spacer 32, and between the protrusions 30 and 31 of both discharge electrodes located within the spacer 32. The arc generated between the two protrusions, that is, the discharge gap 28, is contained within the spacer 32 to prevent it from scattering outside the spacer as much as possible. The discharge gap 28 mentioned above is connected in series to the element 24.

In order to perform a stable discharge, the above-mentioned insulating spacer 32 made of titanium porcelain or the like and its raised portions 30 and 31 are arranged opposite to each other at the upper and lower ends of the spacer 32.
The discharge electrodes 26 and 29 which are arranged in series to form a predetermined discharge gap 28 are called a discharge gap device.

Reference numeral 33 designates an auxiliary electrode, which is electrically connected to the ground-side discharge electrode 29 by a coil spring 34 interposed in a compressed state between the two. It is connected by a nut 39 to a ground terminal 38 protruding from the through hole 36 to the back surface 37 of the main body 1 . 40 is an O-ring for sealing the gap between the penetration part 41 of the ground terminal 38 and the through hole 36 of the main body 1; 43 is the ground terminal 3;
8 is a sealing gasket interposed between the pressing portion 38a and the mounting surface of the back surface 37 of the main body 1; 44 is a mounting flange fixed to the outer peripheral surface 46 of the protruding portion 45 of the main body 1 with an adhesive 47; 42 is a mounting flange It is a support metal fitting connected to the flange 44 by a nut 49, and the support metal fitting 42 and the flange 44 are electrically insulated from the ground terminal 38.

Reference numeral 27 designates a charging-side electrode having a T-shaped cross section and inserted into a synthetic resin seal plug 48, which is tightly connected to the end face of the element 24, and further connected to the lower fixed contact via the connecting conductive plate 14. Connected to 9. 49 and 50 are studs and screws connected to both ends of the conductive plate, 51 is an insulating tube attached to the connecting conductive plate 14, and 52 is an O-ring that seals between the seal plug 48 and the open end 53 above the concave notch 2. , 54
When the insulating cover 55 is inserted, an engagement pin 55 projects and engages with a retaining hole (not particularly shown) in the enlarged part of the opening end using a spring to prevent the seal plug 48 from falling off and rotating. 56 is an insulating lid that closes the upper open end 53 of the recessed part 2 so as to cover the live parts such as the electrode 27 and the connecting conductive plate 14; and 56 is the insulating lid 5.
5 shows an insulating filler filled in the gap between the enlarged outer surface portion of No. 5 and the insulating lid 55.

In this way, the arrester 15 of the present invention has a structure in which its main parts, the discharge gap device and the element, are completely isolated from the outside air.

In the above configuration, under normal conditions, the high voltage cutout can be operated in the same way as a general type high voltage cutout, and at this time the electrical circuit runs from the high voltage distribution line to the upper wire connection terminal 8 - upper fixed contact 6 - It is formed to the primary side of the transformer via an upper movable contact 21, a fuse 23, a lower movable contact 22, a lower fixed contact 9, a lower wire connection terminal 11, and a down line.

If an abnormal voltage such as lightning enters from the above state and is excessive, the abnormal voltage is applied to the arrester 15 via the connecting conductive plate 14 connected to the lower fixed contact 9, and the discharge gap 28 is The element 2 is immediately discharged from the ground terminal 38 to the earth after flashing (discharging), and has non-linear resistance characteristics.
Since the limiting voltage is kept low by the lower fixed contact 9, the insulation of the transformer, etc. connected below the lower fixed contact 9 is not threatened.

In addition, in this case, since the element 24 used is an element mainly composed of zinc oxide ZnO, it can be expected to have excellent effects in response characteristics, limiting voltage, follow-on current interruption, etc., and the fuse 2 of the fuse tube 20
3 prevents unnecessary fuse blowing due to abnormal voltage caused by lightning or the like as in the conventional case.

As described above, in this case, adjacent to the central recessed notch 2 in the main body 1 made of porcelain, the recessed notches 3 and 4 are provided at the upper and lower parts thereof, respectively, and these recessed notches 3 and 4 at the upper and lower portions are provided. Both upper and lower arc extinguishing chambers 7, 10, upper and lower fixed contacts 6, 9, upper and lower electric wire connection terminals 8,
10 are provided, and the lid 6, which is pivotally attached to the main body 1 so as to be openable and closable, has both upper and lower parts that contact or separate from the upper and lower fixed contacts 6 and 9 to open and close the electric circuit. Movable contact 21,
22, and both the upper and lower movable contacts 21,
22, a fuse 23 is interposed between the fuse cylinder 20
In the removable high-voltage cutout, an insulating spacer 32 and an insulating spacer 32 are located in the central recess 2 of the main body 1, which is formed between the upper and lower recesses 3 and 4. A predetermined series discharge gap 28 is formed between the ridges 30 and 31 located at
A discharge gap device consisting of discharge electrodes 26 and 29 provided oppositely on both ends of the spacer 32 so as to form a The upper opening end 53 of the recessed part 2 into which the element 24 made of the solid body is inserted is inserted into the insulating lid 5.
5, the discharge electrode on the ground side of one of the discharge gap devices, which has been closed and further recessed, is connected to the ground terminal 38, which is located below the central recessed part 2 and protrudes from the back surface 37 outside the main body 1. the other element 2
As a result of connecting the charging side electrodes 27 of 4 to the lower fixed contacts 9 of the arc extinguishing device 5 in the lower recessed part 3 provided adjacent to the central recessed part 2 via connecting conductive plates, the high voltage distribution line Compared to the conventional high-voltage cut-out with a built-in arrester, which uses the general type arrester used in the main body and stores it in the storage section of the expanded main body, as shown above, The invented high-voltage cutout has the discharge gap device and elements directly inserted into the recessed part in the center of the main body, so the overall size of the high-voltage cutout (main body) can be further reduced, it is lightweight, and it can be manufactured at low cost. There are features that can be used.

Further, as mentioned above, the discharge gap device connected in series with the element inserted into the recessed part is composed of an insulating spacer and discharge electrodes provided at both ends of the spacer, and the raised parts of both discharge electrodes are positioned within the insulating spacer. Therefore, even if the arrester deteriorates and malfunctions and a follow-on arc flows in the gap, the arc is contained within the insulating spacer and its scattering is prevented as much as possible. Therefore, safety can be improved, such as preventing uneven heat damage within the main body due to the arc.

In addition, as mentioned above, the arrester's discharge gap device inserted into the recessed part and the element connected in series with it are connected between the lower fixed contact on the charging side (load side) and the ground terminal on the grounding side. Even if the arrester (element) deteriorates and malfunctions, making it impossible for the arrester itself to interrupt the follow-on arc, the follow-on arc can be stopped by a fuse attached to a fuse tube connected in series with the arrester (element). This has the advantage of further increasing safety, such as preventing dangerous cutouts from exploding.

[Brief explanation of drawings]

1 and 2 are a side view and a vertical cross-sectional view of a conventional high-pressure cutout with a built-in arrester structure showing the state of use, and FIG. 3 is a vertical cross-sectional view of the cutout showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Main body, 2...Central recessed part, 3...Upper recessed part, 4...Lower recessed part, 5...Upper arc extinguishing device, 6...Upper fixed contact, 7...Upper extinguisher arc chamber, 8
... Upper wire connection terminal, 9 ... Lower fixed contact, 1
0...Lower arc extinguishing chamber, 11...Lower electric wire connection terminal,
12...Lower arc extinguishing device, 14...Connection conductive plate, 1
5... Arrestor, 16... Lid, 20... Fuse tube, 21... Upper movable contact, 22... Lower movable contact, 24... Element, 23... Fuse,
26...discharge electrode (ground side), 27...electrode, 2
8... Discharge gap, 29... Discharge electrode (charged part side), 30... Protrusion, 31... Protrusion, 32...
...Insulating spacer, 53... Opening end, 55... Insulating lid.

Claims (1)

[Scope of utility model registration request] A recessed notch 2 provided in the center of the main body 1 made of porcelain
An upper concave notch 3 and a lower concave notch 4 are provided at the upper part and the lower part 4 are provided on both sides of the main body 1, respectively, and arc extinguishing devices are provided in these upper and lower concave notches 3 and 4, respectively, and they can be opened and closed with respect to the main body 1. The lid 16, which is pivoted on the
In the high-voltage cut-out, which has a fuse 23 interposed between the upper and lower movable contacts 21 and 22, and a fuse tube 20 that is removable, a cylindrical insulating spacer 3
a raised portion 30 that protrudes oppositely into the spacer by discharge electrodes 29 and 26 disposed at both ends of the spacer;
A discharge gap device in which the discharge gap 28 is formed in step 31, and a sintered device containing zinc oxide as a main component and having non-linear resistance characteristics, one end of which is closely connected to one discharge electrode 26 of the device and connected in series to the discharge gap device. An arrester 15 whose main part is an element 24 consisting of a solid body is immersed inside, and the open end 53 above the central recessed notch 2 is closed with an insulating cover 55, and the discharge gap device is A grounding terminal 38 with a grounding side discharge electrode 29 located below the central concave notch 2 and protruding from the back surface 37 outside the main body 1
In addition, the charging side electrode 27 of the element 24 is connected to the lower fixed contact 9 of the arc extinguishing device 12 in the lower recessed notch 4.
A high-voltage cutout with a built-in arrester characterized in that the cutout is connected to a conductive plate 14 through a conductive plate 14.