JPH07101590B2 - cut out - Google Patents

Description

The present invention relates to a cutout that protects a transformer and prevents an accident on an electric line, and more particularly, to a cutout having a lightning protection unit built therein.

(Prior Art) Conventionally, a cavity is provided in a main body insulator of a cutout, an outer opening portion of the cavity is sealed, and a non-linear resistance element and a discharge gap portion are housed in the cavity, and It is known that it is made compact or beautified.

(Problems to be solved by the invention) However, in the conventional cutout, for example, when the lightning surge unit's ability to cut off the follow-current of the lightning surge unit is reduced and high-temperature, high-pressure gas generated by the follow-current arc occurs in the cavity, Due to the unbalanced heat, the main body insulator may be broken and dispersed at the storage location of the non-linear resistance element and fall to the ground, which is a public safety problem.

An object of the present invention is to provide a cutout that solves the above problems.

Configuration of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention relates to a main body insulator made of porcelain having fixed electrodes in the electrode chambers on the power source side and the load side, respectively. In a cutout having a fuse cylinder for connecting or opening between fixed electrodes, a storage cylinder having a cavity communicating with the load side electrode chamber is integrally formed with the main body insulator in a protruding manner, and A gap unit and a non-linear resistor unit were connected to the fixed electrode on the load side in series and housed therein, and a mounting metal fitting to be attached to a pole of a utility pole or the like was integrally fixed to the outer peripheral surface of the housing cylinder. A means is adopted in which a tightening metal fitting is wound and attached, and further, the mounting metal fitting is locked to a locking pin fixed to the main body insulator 1 in a loosely fitted state.

Further, it is preferable to form an annular protrusion on the outer periphery of the storage cylinder so as to lock the upper edge of the fastening member.

(Operation) According to the present invention, the non-linear resistor unit and the gap unit are housed in the housing cylinder integrally formed with the main body insulator, and the fitting fitting of the housing cylinder is fixed to the fitting of the utility pole to the armrest or the like. ,
Also, since this mounting bracket loosely fits the locking pin fixed to the main body insulator to lock the main body insulator, the non-linear resistor unit generates a follow current arc, and the space between the storage cylinder and the main body insulator is increased. Even if it is destroyed, the disconnection between the two is hindered, and the particularly heavy weight locking pin on the body insulator side is loosely fitted in the mounting bracket to the utility pole with a play gap, so the impact due to destruction is mitigated, and the utility pole is Holds the cutout against.

When the annular protrusion that locks the upper edge of the tightening fitting is formed on the outer circumference of the storage cylinder, the mounting position of the tightening fitting can be reliably set with a simple configuration.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to the drawings.

In the main body insulator 1 made of porcelain, a power source side electrode chamber 3 and a load side electrode chamber 4 which are partitioned by partition walls 2, 2 are formed. Fixed electrodes 5 and 6 and arc extinguishing chambers 7 and 8 are embedded and fixed in the two electrode chambers 3 and 4 by a filler 9 at their base end portions. Connection terminals 10 and 11 are attached to the fixed electrodes 5 and 6, respectively, and are connected to a power supply side lead wire and a load side lead wire (not shown), respectively.

On the open side (lower side in FIG. 2) of the main body insulator 1, an insulating lid 12 is pivotally mounted so as to be openable and closable, and inside the insulating lid 12, a pair of fixed electrodes 5 and 6 are connected or opened. Contact blade 13
A fuse cylinder 13 including a and 13b is detachably attached.

A housing cylinder 21 is integrally formed in a protruding shape in the central portion on the back side (upper side in FIG. 2) of the main body insulator 1, and an inner cavity 21a is formed therein. The inner cavity 21a is opened at the upper part thereof, is opened between the partition walls 2 and 2 at the lower part thereof, and communicates with the load side electrode chamber 4 through the guide hole 2a provided in the load side partition wall 2. There is. Further, a step portion 21b having an opening whose inner diameter is smaller than that of the upper opening is formed on the inner peripheral surface of the inner cavity 21a.

A lower conductive unit 22, a gap unit 23, a non-linear resistor unit 24 and an upper conductive unit 25 are provided in the lumen 21a.
Are housed in sequence.

Here, the gap unit 23 and the non-linear resistor unit
24 will be described.

As shown in FIG. 3, the gap unit 23 is provided with an outer cylinder 26a made of an inorganic material such as porcelain, and inside thereof, heat-resistant and impact-resistant quartz glass, alumina porcelain or sound-absorbing porous material. An inner cylinder 26b formed of an inorganic material such as ceramics is provided. Discharge electrodes 27 are arranged on the upper and lower end surfaces of the outer cylinder 26a and the inner cylinder 26b, respectively, and are fixed by glass bonding or screwing. An insulating layer formed by filling an inorganic material such as low melting point glass between the outer peripheral surface of the gap unit 23 and the inner peripheral surface of the inner cavity 21a and heat-welding the main body insulator 1 in a furnace.
28 are provided. The insulating layer 28 is formed by welding without any gap except the upper portion between the two 23 and 21a, and the gap unit 23
Is fixed to the inner cavity 21a. An insulating layer 28a made of foamed rubber is formed above the gap between the members 23, 21a.

The non-linear resistance unit 24 includes a pair of non-linear resistance elements 29 formed in a thick-walled cylindrical shape by a sintered product mainly containing zinc oxide (ZnO), and the upper surface of the non-linear resistance element 29,
A current collecting electrode 30 made of a soft metal plate such as lead is arranged on the lower surface and between them, and they are joined together. The non-linear resistor unit 24 is connected to the gap unit 23 in series via the lower collector electrode 30. The outer peripheral surface of the non-linear resistor unit 24 is insulation-enclosed by a heat-shrinkable tube 31 mainly made of EPR (ethylene propylene rubber) or a silicone rubber tube having excellent heat resistance, and the inner cavity 21a It is arranged with a slight gap left between the inner peripheral surfaces.

The lower conductive unit 22 includes a gap unit 23 and a storage cylinder.
It is arranged between 21 and the step 21b. The lower conductive unit 22 is made of a conductive material such as copper or brass, has a spring receiver 32 joined to the stepped portion 21b, and has a guide hole 32a formed at the center thereof. A support cylinder 33 made of a conductive material is joined to the spring receiver 32, and a conductive lid 34 covering the upper opening of the support cylinder 33 is arranged. Between the conductive lid 34 and the gap unit 23, a withstand voltage electrode 35 made of conductive ceramics such as zirconium boride, which can electrically connect the both, is joined. The pressure-resistant electrode 35 is fixed to the inner peripheral surface of the inner cavity 21a by the insulating layer 28.

The conductive rod 36 is provided so as to penetrate through the opening of the stepped portion 21b, and a cylindrical contact 37 made of a conductive material is screwed onto the upper end of the conductive rod 36 while being fitted in the central opening. A compression spring 38 made of a conductive material is interposed between the contact 37 and the spring receiver 32, and the conductive lid 34 is caused by the spring force of the compression spring 38.
It is pressed against 35 and both are electrically conducted, and
A gap S is formed between the conductive lid 34 and the inner peripheral edge of the upper end of the support cylinder 33.

A string-like filler 39 made of glass wool is wound around the outer periphery of the lower conductive unit 22, and the conductive unit
Glass beads 40 are filled between the space 22 and the inner surface of the inner cavity 21a. The filler 39 is a lower conductive material that flows when the inorganic insulating material charged to form the insulating layer 28 between the outer periphery of the gap unit 23 and the outer periphery of the pressure-resistant electrode 35 and the inner cavity 21a is heated and melted. It prevents the unit 22 from entering the inner and outer circumferences. The opening of the step portion 21b and the conductive rod 3
An O-ring 41 is interposed between the 6 and. The lumen 21a
An insulating material 42 is filled in the lower part of the insulating material 42, and a space between the insulating material 42 and the O-ring 41 is filled in to close the opening of the stepped portion 21b. Further, the conductive rod 3
6 A lower side conductive unit 22 is provided at the lower end of the load side fixed electrode 6
A lead wire 44 to be connected to is attached.

Next, the upper conductive unit 25 will be described. The unit 25 is arranged on the upper side of the non-linear resistor unit 24 in the lumen 21a, and from the first to third conductive cylinders 45, 46, 47 superposed on each other. It is configured. The first conductive cylinder 45 includes a small-diameter cylindrical portion 45a, a leg plate 45b formed on the outer periphery of the lower portion of the cylindrical portion 45a, and a peripheral wall portion 45c protruding from the outer periphery of the leg plate 45b. It is joined to the collecting electrode 30 of the linear resistor unit 24.

The second conductive cylinder 46 includes a tubular portion 46b having a shelf portion 46a, and the tubular portion.
A leg plate 46c formed on the outer periphery of the lower portion of 46b and a peripheral wall portion 46d protruding from the outer periphery of the leg plate 46c are provided, and the leg plate 46c and the peripheral wall portion 46d are the upper surface and the peripheral wall portion of the leg plate 45b of the first conductive cylinder 45. 45c
It is joined to the inner surface. The upper end opening of the second conductive cylinder 46 is closed by a lid 48 made of lead, copper or the like.

The third conductive cylinder 47 includes a peripheral wall portion 47a having a corrugated cross section,
It is arranged on the leg plate 46c of the conductive tube 46, and the peripheral wall portion 47a.
Is joined to the inside of the peripheral wall portion 46d of the second conductive cylinder 46 at the lower part of the. A desiccant 49 is contained between the first conductive cylinder 45 and the second conductive cylinder 46. An insulating layer 50 such as modified silicone rubber, urethane rubber or RTV silicone rubber is bonded between the peripheral wall portions 46d and 47a of the second and third conductive cylinders 46 and 47 and the inner peripheral surface of the inner cavity 21a. It is fixed, and an insulating layer 50a made of foamed rubber is adhesively fixed to the lower side thereof.

Between the cap metal fitting 52 as a cap member, which is caulked to the upper end portion of the storage cylinder 21 via the cushion material 51, and the shelf portion 46a of the second conductive cylinder 46, the upper and lower ends thereof are flexible conductors 53. The spring conductor 54 connected by the above is interposed, and the spring conductor 54 is locked to a hook 52a as a locking member protrudingly provided on the inner surface of the cap fitting 52.

The cap fitting 52 is formed of a thin metal plate such as a copper plate having a central surface protruding in a cap shape so that the cap metal 52 bulges and is deformed by the internal gas pressure due to the short-circuit current arc when the follow current cannot be interrupted and is left alone. In addition, a notch (not shown) for breaking the hole is provided. Further, it is desirable that the discharge electrode 27 and a thin metal plate such as a low melting point alloy are used and that notches are appropriately provided so that they can be melted or broken by gas.

A terminal fitting for connecting the ground wire is provided on the upper surface of the cap fitting 52.
55 is provided.

As shown in FIG. 1, the outer circumference of the storage cylinder 21 is composed of a pair of semi-arcuate tightening bands 56a and 56b, and a connecting plate part 56c that connects the base ends of both bands 56a and 56b. A fastening fitting 56 as a fastening member is fastened and fixed by a bolt 57 and a nut 58. In addition, the connecting plate portion 56c of the tightening fitting 56 has a first
As shown in Figs. 2 and 3, a mounting bracket 59 as a mounting member that is fixed to a pole wire (not shown) of the utility pole is fixedly installed.
A through hole 60 is formed through the 59 and the connecting plate portion 56c. The through hole 60 is filled with cement 9 or the like on the back surface of the main body insulator 1.
The locking pin 61 that is vertically fixed by the above is loosely fitted, and the nut 62 and the split pin 63 that are screwed to the upper end of the locking pin 61 prevent the mounting bracket 59 from coming off from the locking pin 61. Therefore, the storage cylinder 21 is held by the tightening bands 56a and 56b, and the main body insulator 1 is held by the mounting bracket 56 via the locking pin 61, so that the space between the storage cylinder 21 and the main body insulator 1 is damaged. However, the two do not separate and fall. Further, by providing a play gap between the mounting bracket 59 and the locking pin 61, the impact force on the main body insulator 1 when the storage cylinder 21 is broken is alleviated.

In this embodiment, when the lower conductive unit 22 and the gap unit 23 are assembled in the inner cavity 21a,
The spring receiver 32, the support cylinder 33, and the compression spring 38 are sequentially accommodated in the inner cavity 21a, and they are arranged on the step portion 21b. Next, the previously integrated conductive rod 36 and contactor 37 are inserted into the inner cavity 21a, the conductive rod 36 is inserted into the guide hole 32a of the spring receiver 32 and the opening of the step portion 21b, and the contactor is also inserted. Engage 37 with the top of compression spring 38. In this state, the contact 37 is a compression spring.
The spring force of 38 holds the support cylinder 33 at a position protruding above the upper end of the support cylinder 33.

Next, the conductive lid 34 and the pressure-resistant electrode 35 are superposed on the contact 37, and a string-shaped filler 39 and glass beads 40 are provided between the outer periphery of the pressure-resistant electrode 35 and the support cylinder 33 and the inner surface of the inner cavity 21a. To fill. Then, after disposing the gap unit 23 on the pressure-resistant electrode 35, the conductive rod 36 is pulled downward against the spring force of the compression spring 38, the contact 37 is separated from the conductive lid 34, and the conductive The insulating layer 28 is provided between the gap unit 23 and the inner cavity 21a with the opposite ends of the lid 34 and the support tube 33 being in contact with each other.
Of the inorganic material. At this time, even if the inorganic insulating material of the insulating layer 28 is melted as will be described later, it is blocked by the filler 39, so that it does not enter the inside or outside of the lower conductive unit 22.

Then, when the inorganic material is heated and melted in the above state, the insulating layer 28 is formed between the gap unit 23 and the inner cavity 21a, the gap unit 23 is fixed, and the support cylinder 33 contracts due to contraction of each part due to cooling. A gap S is formed between the conductive lid 34 and the conductive lid 34.

Next, regarding the cutout configured as described above,
The operation will be described.

When a lightning surge enters the lightning protection unit arranged between the load-side fixed electrode 6 and the ground wire terminal fitting 55,
The lightning surge is discharged to the ground through the non-linear constant resistance element 29 of the non-linear resistor unit 24 and the gap unit 23 to suppress the voltage rise, and the flashover and the follow-current discharge at the cutout are prevented.

In this embodiment, the heat-shrinkable tube 31 is coated on the outer periphery of the non-linear resistor unit 24, and the gap unit 23 and the upper conductive unit 25 are sealed in the inner cavity 21a via the insulating layers 28, 50, 50a, Since the lid 48 is provided at the opening of the second conductive cylinder 46,
It is possible to prevent fluctuations in the discharge voltage characteristics of the non-linear resistance element 29 and the gap unit 23 due to moisture absorption, and improve the reliability and durability of the lightning protection unit.

Further, in this embodiment, since the pressure resistant electrode 35 made of the conductive ceramics having a high melting point is arranged below the non-linear resistor unit 24, the lightning surge unit cannot interrupt the follow-current interruption due to an excessive lightning surge or the like. When high temperature and high pressure gas is generated in the non-linear resistor unit 24 by the follow-up arc, the downward arc jet flow is blocked. Therefore, the high-temperature and high-pressure gas is not jetted below the pressure-resistant electrode 35, so that the insulating lid 12 and the fuse cylinder 13 are protected and the blowout is prevented. The high-temperature, high-pressure gas, which is prevented from being ejected downward by the pressure-resistant electrode 35, heats and expands the air in the inner cavity 21a to accelerate the pressure, and the lid 4 on the second conductive cylinder 46 which faces the inner cavity 29a is exposed.
8 is melted, the cap metal fitting 52 is bulged and deformed or partially melted and blown out, and the uneven heat and pressure shock of the main body insulator 1 are alleviated, so that scattering and dropping of the cutout can be prevented. .

When the cap fitting 52 is broken, the spring conductor 54 is a locking member so as not to be blown off by the jet gas, that is,
Cap metal fitting 52 fixed to the main body insulator 1 by the hook 52a
Since it is connected to the spring conductor 54,
The conductive cylinders 45, 46, 47 pressed against are also held in the inner cavity 21a and do not fly out to the outside, so that scattering and falling of crushed pieces of the non-linear resistance element 29 are also prevented.

Particularly, in the embodiment of the present invention, the mounting bracket 59 connected to the tightening band 56a for supporting the storage cylinder 21 of the non-linear resistor unit 24 integrally formed with the main body insulator 1 in a protruding shape is fixed to the main body insulator 1. Since the locking pin 61 is locked with a play gap provided, even if the main insulator 1 and the storage cylinder 21 are damaged due to the high temperature and high pressure gas of the follow-up arc, both are locked. 61
Since it is connected with the mounting bracket 59, the main body insulator 1
The storage cylinder 21 and the storage cylinder 21 are prevented from being separated from each other and are prevented from falling, and public safety can be achieved. Further, particularly, since the main body insulator 1 having a large weight is linked with the play gap between the locking pin 61 and the mounting bracket 59, even if the cutout is broken, the impact of the breakage is mitigated, and Insulator 1 and storage cylinder
It is possible to prevent disconnection between the 21 parts and the main body insulator from falling to the ground.

Further, in the above embodiment, the outer peripheral surface of the non-linear resistor unit 24 and the outer peripheral surface of the third conductive cylinder 47 of the upper conductive unit 25 are covered with the heat-shrinkable tube 31, and between the tube 31 and the inner cavity 21a. Since the void is provided in the non-linear resistance element 29, it is possible to prevent the stress in the storage cylinder 21 due to the expansion caused by the discharge heat generation of the non-linear resistance element 29, and even if the non-linear resistance element 29 is crushed by the following flow. Also, it has an explosion-proof effect by relaxing the pressure shock to the main body insulator 1.

Further, in this embodiment, the pressure-resistant electrode 35 and the step portion 21b in the lumen 21a are
Since the compression spring 38 is disposed between the pressure resistant electrode 35 and the insulating layer 28, when a large gas pressure is applied to the pressure resistant electrode 35 such that the pressure resistant electrode 35 is separated from the insulating layer 28, the pressure shock is applied to the pressure resistant electrode 35 and the conductive lid 34. The gap S, that is, the urging force of the compression spring 38 is absorbed within a range in which the elastic force between the support cylinder 33 and the support cylinder 33 can be maintained, and the impact on the stepped portion 21b side is alleviated and the impact resistance of the main body insulator 1 is enhanced. be able to.

Further, since the desiccant 49 is stored in the upper conductive unit 25, even if the desiccant 49 is sucked into the conductive unit 25,
Can be removed by the above, and it can contribute to suppressing the deterioration factor of the nonlinear resistance element 29.

In addition, in this embodiment, since the gap unit 23 is arranged closer to the withstand voltage electrode 35 than the nonlinear resistor unit 24, the high temperature generated in the gap unit 23 is higher than that in the case where the gap unit 23 is separated from the withstand voltage electrode 35. In addition, the convection time of the high-pressure gas can be shortened and the high-pressure gas can be instantaneously discharged.

The present invention can also be embodied as follows.

Provide the locking pin 61 also on the load side of the main body insulator 1.

As described above in detail, in the cutout of the present invention, the linear resistor unit becomes unable to shut off the follow current, and the high temperature and high pressure gas due to the follow arc causes a gap between the storage cylinders that house the main body insulator and the lightning protection unit. Even if it is destroyed, the impact of the destruction is mitigated by the fastening metal fittings of the storage cylinder, which is fixed to the utility pole, and the locking pin on the main body insulator side, which prevents the disconnection of the two and causes the main body insulator to drop on the ground. Is surely prevented and the safety of the facility can be enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan sectional view of only a main part of a cutout embodying the present invention, and FIG. 2 is a sectional view showing the entire cutout,
FIG. 3 is a sectional view of the lightning protection unit, and FIG. 4 is an enlarged sectional view of the upper conductive unit. 1 ... Main body insulator, 3 ... Power source side electrode chamber, 4 ... Load side electrode chamber,
5, 6 ... Fixed electrode, 13 ... Fuse cylinder, 21 ... Storage cylinder, 21a ... Lumen, 23 ... Gap unit, 24 ... Non-linear resistance unit, 29 ... Non-linear resistance element, 56 ... As tightening member Tightening metal fittings, 56a, 56b ... Tightening band, 56c ... Connecting plate part, 57 ... Bolt, 58, 62 ... Nut, 59 ... Mounting metal fitting as a mounting member, 6
0 ... Through hole, 61 ... Locking pin as connecting member, 63 ... Split pin.

Front page continuation (72) Eiichi Yanagisawa Eiichi Yanagisawa 2-chome, Ogimachi, Meito-ku, Nagoya, Aichi (72) Inventor Hiromi Nagasaka 35 No. 35, Osamu, Higashiura-cho, Chita-gun, Aichi Prefecture (72) Chihiro Ishibashi, Aichi 3 Maruikedai, Ogawa, Higashiura-cho, Chita-gun, prefecture 3 (72) Inventor Junichi Matsumoto 2 38-chome, 2-chome Okamachi, Mizuho-ku, Nagoya, Aichi Prefecture (72) Inventor Akitsuko Akiyoshi Hashima, Tadashi, Gifu 2 No. 1258, Oura Kimachi (72) Inventor Mitsuyoshi Nagase No. 8 No. 127, Nakahata, Minamishinmachi, Owariasahi-shi, Aichi (56) References Japanese Unexamined Patent Publication No. 57-191930 (JP, A) No. 57-138248 (JP, U) ) Actual development Sho 53-131546 (JP, U)

Claims (2)

[Claims] 1. A porcelain body insulator (1) having fixed electrodes (5, 6) in the electrode chambers (3, 4) on the power source side and the load side, respectively.
And a cutout having a fuse cylinder (13) for connecting or disconnecting the fixed electrodes (5, 6), a lumen communicating with the load side electrode chamber (4) with respect to the main body insulator (1) A storage cylinder (21) having (21a) is integrally formed, and a gap unit (23) is provided in the lumen (21a).
A non-linear resistor unit (24) is connected in series to the fixed electrode (6) on the load side and accommodated therein, and a mounting bracket (21) is attached to the outer peripheral surface of the accommodating cylinder (21) for a pole of a utility pole or the like. 59) The fastening metal fitting (56) integrally fixed to the main body insulator (1) is wound and attached, and the mounting metal fitting (59) is loosely fitted to the locking pin (61) fixed to the main body insulator (1). Cutout characterized by being locked. 2. The cutout according to claim 1, wherein the storage cylinder (21) has an annular projection (21b) on its outer periphery for locking the upper edge of the fastening metal (56).