CN2344847Y

CN2344847Y - Combined metal oxide lightning arrester with silicon rubber casing

Info

Publication number: CN2344847Y
Application number: CN 98233025
Authority: CN
Inventors: 叶德平; 张雨时; 彭济南; 刘颖
Original assignee: Shendian Lightning Arrester Co
Current assignee: Xian Shendian Electronics Co Ltd
Priority date: 1998-09-22
Filing date: 1998-09-22
Publication date: 1999-10-20
Anticipated expiration: 2008-09-22

Abstract

The utility model relates to a lightning arrester used for preventing electric equipment from being damaged by an overvoltage, particularly a combined metal oxide lightning arrester with a silicon rubber casing which can realize security protection by double layer seal. The utility model is mainly composed of an internal casing, electrodes, springs, and components such as an insulating base, etc., wherein, the electrodes and the springs are arranged in the internal casing, and the components are fixedly installed at the lower part of the internal casing. The utility model has the advantages of reasonable structure, small size, light weight, reliable sealing, good explosion proof performance, flexible installation, convenience, etc. The utility model can be widely used for insulation between phase wires and phase wires, and phase wires and ground of important electrical equipment such as rotating dynamoelectric machines, parallel compensation capacitor banks, transformers, etc., and can be used for preventing important electrical equipment from being damaged by an overvoltage.

Description

Composite type silastic material metal oxide arrester

The utility model relates to a kind of electric equipment and avoids the lightning arrester that overvoltage is damaged usefulness, particularly a kind of by double-layer seal, stop the composite type silastic material metal oxide arrester that it is used when the high voltage protective state breaks down, because of the caused blast of the red-hot free gas of its internal high pressure and separation of fragments, realization safeguard protection.

In existing technical scheme, various metal oxide arresters, its shell is ceramic material and makes.Its shortcoming is: during as the big electric current of overvoltage, its inner valve block be because of the red-hot free gas of high pressure that produced of heating can't discharge, and causes its blast and separation of fragments and breaks contiguous electric equipment, even cause personnel's on the scene casualty accident.

The purpose of this utility model is to overcome the shortcoming of above-mentioned prior art, and provide a kind of by double-layer seal, adopt silastic material and effectively gaseous emission mechanism, can the red-hot free gas of fine release high pressure when the abnormality, stop to explode and composite type silastic material metal oxide arrester that separation of fragments, realization safeguard protection are used.

The solution that realizes the utility model purpose is: a kind of composite type silastic material metal oxide arrester, comprise an inner casing and an insulator foot, described inner casing be one can be by such as epoxy fibreglass cloth or the hollow garden of the column tube made with the similar insulating material of its performance, on it, the inwall of lower port is equipped with internal thread, on described, a top electrode and a bottom electrode are housed respectively in the following internal thread, in it described on, one group of likeness in form Cylinder is housed between the bottom electrode successively, fold the thick zinc oxide valve plate that pastes mutually mutually and it is fixed the spring of usefulness, its special character is: it is vertical mutually that the perisporium of described inner casing radially is provided with one group of its line of centres successively relatively by central axis, be in the explosionproof hole of different level, a likeness in form tower shape is housed in the internal thread of its upper port, the center, upper surface is provided with a screw, bolt is housed in the screw, garden week is provided with coupled screw thread outside the bottom, the lower surface is the plane, the top electrode that can make by conductor material, a likeness in form also is housed in the internal thread of its lower port is inverted the tower shape, the center, lower surface is provided with screw, be equipped with in the screw in order to connect the construction bolt of insulator foot, garden week is provided with coupled screw thread outside the top, the upper surface is the plane, the also bottom electrode that can make by conductor material, itself and described on, on outer garden week of bottom electrode, following screw thread junction is respectively equipped with, lower seal glue Raschig ring, on its periphery reaches, the outer end of bottom electrode (except that screw) all seal be sticked mutually one special, likeness in form cucurbit shape, can connect and compose the silastic material of its profile by a plurality of waves transition successively, the construction bolt of its lower surface in screwing in described bottom electrode screw is connected with an insulator foot, described insulator foot is a lid shape square cavity, its center, upper surface is provided with a through hole that can insert construction bolt, its sidewall is provided with the connecting hole that itself and plain conductor can be one another in series by connector, and the open-mouth of its lower surface can be provided with the base cover plate.

Accompanying drawing has been described a preferred embodiment of the present utility model.

Fig. 1 is the structure principle chart of the utility model embodiment.

Below in conjunction with accompanying drawing content of the present utility model is described in detail.

Know referring to Fig. 1: the utility model comprises an inner casing 7 and an insulator foot 15, described inner casing 7 be one can be by such as epoxy fibreglass cloth or the hollow garden of the column tube made with the similar insulating material of its characteristic, on it, the inwall of lower port is equipped with internal thread, on described, a top electrode 5 and a bottom electrode 11 are housed respectively in the following internal thread, one group of likeness in form Cylinder is housed between described top electrode 5 and the bottom electrode 11 in it successively, fold the thick zinc oxide valve plate 8 that pastes mutually mutually and it is fixed the spring 10 of usefulness, it is vertical mutually that its perisporium radially is provided with one group of its line of centres successively relatively by central axis, be in the explosionproof hole 9 of different level, a likeness in form tower shape is housed in the internal thread of its upper port, the center, upper surface is provided with a screw, bolt 1 is housed in the screw, garden week is provided with coupled screw thread outside the bottom, the lower surface is the plane, the top electrode 5 that can make by conductor material, a likeness in form also is housed in the internal thread of its lower port is inverted the tower shape, the center, lower surface is provided with screw, be equipped with in the screw in order to connect the construction bolt 13 of insulator foot 15, garden week is provided with coupled screw thread outside the top, the lower surface is the plane, the bottom electrode 11 that can make by conductor material, on itself and described top electrode 5 and 11 outer garden weeks of bottom electrode, following screw thread junction is respectively equipped with fluid sealant Raschig ring 6 and lower seal glue Raschig ring 12, its periphery and top electrode 5 and the outer end (except that screw) of bottom electrode 11 all seal be sticked mutually one special, likeness in form cucurbit shape, can connect and compose the silastic material 4 of its profile by a plurality of waves transition successively, the construction bolt 13 of its lower surface in screwing in described bottom electrode 11 screws is connected with an insulator foot 15, described insulator foot 15 is a lid shape square cavity, its center, upper surface is provided with a through hole that can insert construction bolt 13, its sidewall is provided with the connecting hole that itself and the metal earth 14 that links to each other with construction bolt 13 can be one another in series by connector 16, and the open-mouth of its lower surface can be provided with base cover plate 17.

The profile of silastic material 4 described in the utility model is the wave wire, its objective is to increasing creepage distance, the lonely generation of prevention interpolar electricity.

The utility model operation principle is as follows:

During the utility model work, generally with the lightning arrester of four individual members by connector 16 with its insulator foot 15 and the metal earth 14 that links to each other by construction bolt 13 with each lightning arrester bottom electrode 11, be connected to each other according to connected modes such as installation site one-tenth in-line capable of being combined, isosceles triangle or squares, build base cover plate 17, again insulator foot 15 is installed on desired location.Then with four lightning arrester A, B, C, D wherein three as A, B, C successively the bolt 1 by its upper end be connected in through nut 2 and pad 3 correspondences in the wiring of power supply phase line a, b, c of the protected electric equipment of electric power system, the upper end of all the other D (can be provided with the ground connection symbol) is through bolt 1, nut 2 and pad 3 ground connection.Like this, the lightning arrester of per two individual members such as A-B, B-C, A-C can form mutually an alternate overvoltage protection lightning arrester, and A-D, B-D, C-D can form the overvoltage protection lightning arrester between a ground mutually.

Zinc oxide valve plate 8 described in the utility model has excellent nonlinear characteristic, and it has high resistance under operating voltage, can be considered insulator high pressure over the ground or the high voltage between phase line and phase line separate.But under the overvoltage effect, it is minimum that its resistance becomes again, can be considered conductor superpotential energy is discharged, thereby limited superpotential amplitude, the electric insulation that makes protected electric equipment not by over-voltage breakdown, break.

Inner casing described in the utility model 7 is made for intensity epoxy fibreglass cloth tube big, non-friable, good flame resistance, and its perisporium is provided with explosionproof hole 9, and described overcoat 4 adopts good toughness, silastic material non-friable, that anti-flammability is also good to make.When the utility model is in operation when damaging because of overvoltage, big electric current makes inner valve block heating, punctures or bursts, the red-hot free gas of the high pressure of its generation just acts on the silastic material 4 by the explosionproof hole 9 on inner casing 7 perisporiums, silastic material 4 is broken, and evoke electric arc along described lightning arrester overcoat 4 flashovers, avoided the generation of Explosion of on Arrester and separation of fragments.

In conjunction with the foregoing description as can be seen, the utility model has following advantage compared to existing technology:

1. rational in infrastructure, volume is little, in light weight;

2. sealing is reliable, explosion-proof performance is good;

3. flexible for installation, convenient.

The utility model can be widely used in the phase line and the insulation between phase line and phase line and ground of important electric equipments such as electric rotating machine (as generator, motor), parallel capacitor group, transformer and avoid the overvoltage damage, also can be used for the overvoltage insulation protection of other electric equipment.

Claims

1. composite type silastic material metal oxide arrester, comprise an inner casing (7) and an insulator foot (15), described inner casing (7) be one can be by such as epoxy fibreglass cloth or the hollow garden of the column tube made with the similar insulating material of its characteristic, on it, the inwall of lower port is equipped with internal thread, on described, a top electrode (5) and a bottom electrode (11) are housed respectively in the following internal thread, one group of likeness in form Cylinder is housed between described top electrode (5) and the bottom electrode (11) in it successively, folded thick mutually zinc oxide valve plate (8) and the spring (10) that pastes mutually, it is characterized in that: it is vertical mutually that the perisporium of described inner casing (7) radially is provided with one group of its line of centres successively relatively by central axis, be in the explosionproof hole (9) of different level, a likeness in form tower shape is housed in the internal thread of its upper port, the center, upper surface is provided with screw, bolt (1) is housed in the screw, garden week is provided with coupled screw thread outside the bottom, the lower surface is the plane, the top electrode (5) that can make by conductor material, a likeness in form also is housed in the internal thread of its lower port is inverted the tower shape, the center, lower surface is provided with screw, construction bolt (13) is housed in the screw, garden week is provided with coupled screw thread outside the top, the upper surface is the plane, the also bottom electrode of making by conductor material (11), on itself and described top electrode (5) and bottom electrode (11) outer garden week, following screw thread junction is respectively equipped with fluid sealant Raschig ring (6) and lower seal glue Raschig ring (12), its periphery and top electrode (5) and the outer end (except that screw) of bottom electrode (11) all seal be sticked mutually one special, likeness in form cucurbit shape, can be connected and composed the silastic material (4) of its profile by a plurality of waves transition successively, the construction bolt (13) of its lower surface in screwing in described bottom electrode (11) screw is connected with an insulator foot (15).

2. composite type silastic material metal oxide arrester as claimed in claim 1, it is characterized in that: described insulator foot (15) is a lid shape square cavity, its center, upper surface is provided with a through hole that can insert construction bolt (13), its sidewall is provided with the connecting hole that itself and the metal earth (14) that links to each other with construction bolt (13) can be one another in series by connector (16), and the open-mouth of its lower surface can be provided with base cover plate (17).