CN217639466U - Adss optical cable discharge alarm device - Google Patents
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- CN217639466U CN217639466U CN202122775113.7U CN202122775113U CN217639466U CN 217639466 U CN217639466 U CN 217639466U CN 202122775113 U CN202122775113 U CN 202122775113U CN 217639466 U CN217639466 U CN 217639466U
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Abstract
The utility model relates to an optical cable alarm device technical field, in particular to an adss optical cable electricity discharge alarm device, which solves the problem that the existing electricity discharge alarm device is inconvenient to install and disassemble and reduces the working efficiency, and comprises an installation box and an alarm device body, wherein a box cover is installed at one side of the installation box, an installation block is fixedly installed at the inner side of the installation box, a clamping groove is formed in the middle part of the installation block, a connecting disassembling piece is installed at one side of the alarm device body, and the connecting disassembling piece is movably installed in the clamping groove; this adss optical cable electricity discharge alarm device can effectually install and dismantle to the installation is convenient with the dismantlement easy operation, and is reliable and stable, thereby makes things convenient for the workman to use the operation to electricity discharge alarm device, also the effectual work efficiency that improves the workman.
Description
Technical Field
The utility model relates to an optical cable alarm device technical field, in particular to adss optical cable discharge alarm device.
Background
The all-dielectric self-supporting optical cable (ADSS) has the advantages of no metal, tension resistance, self-supporting, high insulation, no inductivity, thin diameter, light weight, easy construction, economy and the like. The optical fiber bundle is wound on a central reinforcing member and is manufactured into a combined optical cable through protection measures such as insulation, water prevention, reinforcement, sheath and the like.
The all-dielectric self-supporting optical cable is composed of dielectric materials, comprises a necessary supporting system, can be directly hung on a nonmetal optical cable on an electric power tower, is mainly used for a communication line of an overhead high-voltage transmission system, and can also be used for a communication line in an overhead laying environment such as a thunder and lightning prone zone, a large span and the like.
The All-Dielectric Self-Supporting ADSs (All Dielectric Self Supporting) optical cable provides a fast and economical transmission channel in an electric power communication system due to the advantages of unique structure, good insulation and high temperature resistance, high tensile strength and the like. In general, an ADSS cable is cheaper than an OPtical fiber composite Ground (OPGW) cable for many applications and it is easier to install. It is desirable, and even necessary in some locations, to use the ADSS cable to erect the ADSS cable using towers in or near the power line. The ADSS optical cable has the main purposes that:
(1) The optical cable is used as an incoming and outgoing optical cable of the OPGW system relay station, and based on the safety attribute of the optical cable, the problem of electric power isolation can be well solved when the optical cable is led in and out of the relay station.
(2) The optical fiber cable is used as a transmission optical cable of an optical fiber communication system in a high-voltage (110 kV-220 kV) power network. Especially in many places it is convenient to use old communication lines when retrofitting them.
(3) The optical fiber communication system is used for an optical fiber communication system in a 6 kV-35 kV-180 kV power distribution network.
The phenomenon of galvanic corrosion:
the following are several examples of the phenomenon of galvanic corrosion.
For example, in the satellite station of the Yangdong optical fiber OPGW optical fiber communication line, the ADSS leading-in outgoing optical cable of the satellite station has two cable breakage accidents respectively at 6 month 2 and 6 month 23 of 2003. The cable breaking positions are respectively as follows: one is the middle position of the damper; the other is positioned at a position about 50cm outside the damper. The appearance phenomenon of the cable breakage part is obvious treelike electric marks and burning marks; the outer sheath is broken and the aramid yarn is exposed, so that slight burn is caused; the outer sheath has neat fracture marks, and aramid yarns are aged; the inner protective cushion layer also has serious burn-through traces; meanwhile, the optical cable in the middle of the vibration damper has obvious tree-like electric traces, and electric trace spots also exist at the tail end of the hardware fitting. The contact parts of the damper and the optical cable of the twice cable breakage show spiral melting traces. The anti-vibration whip has obvious electric mark phenomenon.
For another example, after a 220kV double-circuit line system in a certain place is put into operation for 1 year, the ADSS optical cable is burnt out to cause a cable breakage accident. The outer sheath at the fracture part is obviously molten, the aramid yarn is exposed, and has obvious burning traces, and the anti-vibration whip also has obvious cracking phenomenon and is carbonized. Holes are found at a plurality of positions of the unbroken part, and scald marks caused by the vibration damper to the optical cable are carbonized.
For another example, the optical fiber communication line belonging to the coastal state electric service bureau of Shandong province has been blown after the optical cable is used for several years. The accidents show that in a high-voltage power grid of 110-220 kv, if the location of an ADSS optical cable used in an optical fiber communication system is improperly selected or other protection measures are incomplete, the accidents of electric corrosion, cable breakage and the like of the A-connection optical cable are inevitable.
The reason for the galvanic corrosion is:
in 110kV to 220kV high-voltage power networks, the reason that optical fiber cables for optical fiber communication are burnt and broken is caused by electric corrosion. The reasons for the occurrence of galvanic corrosion are mainly as follows:
(1) Breakdown: the space potential of the ADSS optical cable is too high, so that electric arcs with enough energy are generated on the surface of the ADSS optical cable, great heat is caused, an outer sheath of the ADSS optical cable is broken down, and molten edge perforation occurs. Meanwhile, aramid yarn is also blown, so that the mechanical strength of the ADSS is greatly reduced, and cable breakage is caused.
(2) Electric marking: the arc forms a radial (dendritic) carbonization at the cuff surface. After the M3SS optical cable is electrically scratched, the sheath of the M3SS optical cable is cracked under the action of tension, and the aramid yarn is exposed.
(3) And (3) corrosion: the ADSS cable, when exposed to high potential electric fields, may leak current through the jacket and generate heat that may cause the polymer of the jacket to slowly lose its bonding strength and eventually fail. Which is manifested as a rough, thin surface of the jacket. The corrosion phenomenon occurs slowly.
(4) Dry-charged arc: in a 110kV to 220kV high-voltage power grid, an ADSS optical cable is in a high-electric-field and dirty environment, the surface of the optical cable has a high potential and becomes dirty under the influence of dirt, and therefore when a certain leakage current is generated between the ADSS optical cable and a grounded hardware fitting and passes through an outer sheath of the optical cable, heat is generated. The heat energy reduces the bonding force of the polymer of the outer sheath material of the optical cable and makes the outer sheath material ineffective, and also makes the moisture on the surface of the optical cable continuously evaporate, so that some drying zones randomly appear, the circulation of leakage current is hindered, and the potential accumulation appears at two ends of the drying zones. When this potential builds up sufficiently high, an electrical discharge occurs at the surface of the outer jacket of the cable, forming an arc known as "dry-band arc" or "dry-band flashover". Therefore, the occurrence of the electrocorrosion of the ADSS optical cable is caused by the dry-charged arc.
Prevention of galvanic corrosion:
the root cause of the occurrence of the electro-corrosion is that the ADSS cable is in an environment of high electric field or high potential, and therefore, a basic measure for preventing or reducing the damage of the electro-corrosion to the ADSS cable is to hang the ADSS cable at a place where the spatial potential is not too high and the potential gradient is not too large. In addition to this measure, several methods can also prevent the occurrence of galvanic corrosion phenomena:
(1) The ADSS optical cable and related parts (such as a vibration damper and the like) are sprayed with a water increasing agent, so that the ADSS optical cable and the related parts are prevented from being stained with dripping water. Therefore, the dry band of the ADSS optical cable outer protective layer can be avoided, and the generation of dry band electric arc is prevented.
(2) And (3) spraying insulating agents such as mica fog powder base or ceramic powder base and the like on the ADSS optical cable component to prevent the generation of 'dry band arc'.
In the long-term use process of a power line, due to the fact that the cable is aged and corroded, the cable has the danger of electricity leakage, and in order to solve the potential safety hazard caused by the electricity leakage of the cable, an electricity leakage alarm device needs to be installed on a power tower.
When the existing electricity leakage alarm device is mounted, dismounted and maintained, a plurality of bolts need to be screwed, so that a large amount of time is wasted, and the working efficiency of workers is reduced; therefore, improvements are needed to address the current situation.
SUMMERY OF THE UTILITY MODEL
The utility model aims at not enough among the prior art, provide an adss optical cable lets out electric alarm device, the effectual current electric alarm device that lets out of having solved is not convenient for install and dismantle and reduce work efficiency's problem.
The technical scheme is as follows:
the utility model provides an adss optical cable alarm device that lets out electricity, includes install bin and alarm device body, the case lid is installed to one side of install bin, and the inboard fixed mounting of install bin has the installation piece, and the draw-in groove has been seted up at the middle part of installation piece, and connection dismounting member is installed to one side of alarm device body, connects dismounting member movable mounting in the inside of draw-in groove.
Preferably, first inner grooves are symmetrically formed in two ends of the clamping groove, first springs are fixedly mounted inside the first inner grooves, T-shaped bolts are movably mounted inside the first inner grooves, the T-shaped bolts are fixedly connected with the first springs, and one ends of the T-shaped bolts extend into the clamping groove.
Preferably, the connecting and detaching piece comprises a connecting plate, two inserting blocks and inserting holes, the connecting plate is connected with the alarm device body through screws, the two inserting blocks are fixedly installed at two ends of the connecting plate, the inserting holes are formed in the middle of one side, back to the back, of the two inserting blocks, the two inserting blocks are movably inserted into the clamping groove, and one end of the T-shaped bolt is movably inserted into the inserting holes.
Preferably, two inserting plates are symmetrically installed in the middle of one side of the connecting plate, square inserting grooves are formed in the middle of the top and the middle of the bottom of the installing block, and the two inserting plates are movably inserted into the two square inserting grooves.
Preferably, a second inner groove is formed in each jack, a T-shaped top block is movably mounted in each second inner groove, a second spring is fixedly mounted in each second inner groove, and one end of each second spring is fixedly connected with the T-shaped top block.
Preferably, the rotating groove has all been seted up at the top of second inside groove, and the inside rotation in rotating groove installs the dwang, and the top fixed mounting of T shape kicking block has the touch piece, and the one end of dwang contacts with one side of touch piece, and the other end of dwang extends to the top and the fixed mounting of inserted block has the ring.
Preferably, solar cell panel is installed at the top of install bin, and alarm loudspeaker are all installed on the upper portion of install bin both sides, and the battery is installed to the inside bottom of install bin, through wire electric connection between battery and solar cell panel and the alarm device body, the alarm device body passes through wire and alarm loudspeaker electric connection.
Compared with the prior art, the beneficial effects of the utility model are that:
in work, the adss optical cable electricity leakage alarm device can be effectively installed and disassembled by arranging the installation block, the clamping groove, the connecting and disassembling piece, the first inner groove, the first spring, the T-shaped bolt, the connecting plate, the inserting block, the inserting hole, the inserting plate, the square inserting groove, the second inner groove, the T-shaped top block, the second spring, the rotating groove, the rotating rod, the contact block and the ring, and is simple, convenient, stable and reliable in installation and disassembly operation, so that a worker can conveniently use and operate the electricity leakage alarm device, and the working efficiency of the worker is effectively improved, and therefore, the adss optical cable electricity leakage alarm device can meet the use requirements of power equipment;
when the installation box is used, the installation box is installed on an electric power tower, then the two inserting blocks are inserted into the clamping grooves through the installation alarm device body, the inserting blocks can extrude the T-shaped bolt in the inserting process, the T-shaped bolt is moved into the first inner groove and compresses the first spring, and when the jack is aligned with the T-shaped bolt, the T-shaped bolt can be inserted into the jack through the elastic force of the first spring to play a role in fixing, so that the alarm device body can be stably installed;
the alarm device body is connected with the electric power tower through a lead; when the adss optical cable is discharged, current appears on the surface of the electric power tower, the current on the surface of the electric power tower is transmitted to the alarm device body through the conducting wire, and when the alarm device body detects the current, the alarm horn is started to give an alarm to remind a worker to overhaul and maintain the adss optical cable and the electric power tower;
when the alarm device body needs to be disassembled and overhauled, the two rings are rotated by stirring, the two rings move relatively, the two rotating rods can be rotated by the relative movement of the two rings, the contact blocks can be extruded by the rotation of the two rotating rods and the T-shaped top block can be moved, the T-shaped top block is moved from the inside of the second inner groove to the inside of the jack and stretches the second spring, the T-shaped bolt inside the jack can be extruded and pushed by the T-shaped bolt when the T-shaped top block is moved to the jack, the T-shaped bolt is moved to the inside of the first inner groove and compresses the first spring, and then the two inserting blocks are withdrawn from the inside of the clamping groove through the two rings to complete the disassembly of the alarm device body.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.
In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a partial structure of the present invention;
FIG. 3 is a schematic structural view of the mounting block of the present invention;
fig. 4 is a schematic cross-sectional view of fig. 3 according to the present invention;
FIG. 5 is a schematic structural view of the connecting and disconnecting member of the present invention;
FIG. 6 is a schematic cross-sectional view of the insert of the present invention;
FIG. 7 is a schematic diagram of the electricity discharge detection alarm circuit of the present invention;
FIG. 8 is a schematic view of the remote power-off detection alarm module of the present invention;
FIG. 9 is a schematic diagram of the field implementation arrangement structure of the present invention;
in the figure:
1. the alarm device comprises an installation box, 2, an alarm device body, 3, a box cover, 4, an installation block, 5, a clamping groove, 6, a connection and disassembly part, 7, a first inner groove, 8, a first spring, 9, a T-shaped bolt, 10, a connecting plate, 11, an insertion block, 12, an insertion hole, 13, an insertion plate, 14, a square insertion groove, 15, a second inner groove, 16, a T-shaped top block, 17, a second spring, 18, a rotating groove, 19, a rotating rod, 20, a contact block, 21, a ring, 22, a solar panel, 23, an alarm horn, 24, a storage battery, 25, an LED warning lamp, 26, a current detection unit, 27, a wireless transmission unit, 28, a photovoltaic controller, 29, 30, an ADSS cable, 31, a pre-twisted protection wire, 32, a U-shaped ring, 33, an insulator, 34, a clamp support, 35 and a connecting wire.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The first embodiment is as follows:
as shown in fig. 1 to 7, the utility model comprises an installation box 1 and an alarm device body 2, wherein a box cover 3 is installed on one side of the installation box 1, an installation block 4 is fixedly installed on the inner side of the installation box 1, a clamping groove 5 is formed in the middle of the installation block 4, a connection and disassembly part 6 is installed on one side of the alarm device body 2, and the connection and disassembly part 6 is movably installed in the clamping groove 5; first inner grooves 7 are symmetrically formed in two ends of the clamping groove 5, first springs 8 are fixedly mounted inside the first inner grooves 7, T-shaped bolts 9 are movably mounted inside the first inner grooves 7, the T-shaped bolts 9 are fixedly connected with the first springs 8, and one ends of the T-shaped bolts 9 extend into the clamping groove 5, so that telescopic adjustment can be effectively carried out; the connecting and disassembling piece 6 comprises a connecting plate 10, two inserting blocks 11 and a jack 12, the connecting plate 10 is connected with the alarm device body 2 through a screw, the two inserting blocks 11 are fixedly arranged at two ends of the connecting plate 10, the jack 12 is arranged in the middle of one side of each of the two inserting blocks 11, the two inserting blocks 11 are movably inserted into the clamping groove 5, one end of the T-shaped bolt 9 is movably inserted into the jack 12, and therefore installation can be conveniently carried out;
when the alarm device body 2 needs to be installed, the two insertion blocks 11 are inserted into the clamping groove 5, the insertion blocks 11 can extrude the T-shaped bolt 9 in the inserting process, so that the T-shaped bolt 9 moves into the first inner groove 7 and compresses the first spring 8, when the jack 12 is aligned with the T-shaped bolt 9, the T-shaped bolt 9 can be inserted into the jack 12 through the elastic force of the first spring 8 to play a fixing role, and the alarm device body 2 can be stably installed;
two inserting plates 13 are symmetrically arranged in the middle of one side of the connecting plate 10, square inserting grooves 14 are formed in the middle of the top and the bottom of the mounting block 4, and the two inserting plates 13 are movably inserted into the two square inserting grooves 14, so that the connecting plate 10 is more firmly and stably mounted and connected; when the two inserting blocks 11 are inserted into the interior of the card slot 5, the two inserting plates 13 are inserted into the interior of the two square slots 14, so that an effective reinforcing effect is achieved; a second inner groove 15 is formed in each jack 12, a T-shaped top block 16 is movably mounted in each second inner groove 15, a second spring 17 is fixedly mounted in each second inner groove 15, and one end of each second spring 17 is fixedly connected with the T-shaped top block 16, so that telescopic adjustment can be effectively performed; the top of the second inner groove 15 is provided with a rotating groove 18, the rotating rod 19 is rotatably arranged in the rotating groove 18, the top of the T-shaped top block 16 is fixedly provided with a contact block 20, one end of the rotating rod 19 is contacted with one side of the contact block 20, and the other end of the rotating rod 19 extends to the upper part of the inserting block 11 and is fixedly provided with a finger ring 21, so that the operation can be effectively carried out, and the alarm device body 2 can be conveniently and effectively disassembled;
when the alarm device body 2 needs to be disassembled and overhauled, the two finger rings 21 are shifted to enable the two finger rings 21 to move relatively, the two rotating rods 19 can rotate due to the relative movement of the two finger rings 21, the contact block 20 can be extruded and the T-shaped top block 16 can be moved due to the rotation of the two rotating rods 19, so that the T-shaped top block 16 can move to the inside of the jack 12 from the inside of the second internal groove 15 and stretch the second spring 17, the T-shaped top block 9 in the jack 12 can be extruded and pushed when the T-shaped top block 16 moves to the inside of the jack 12, the T-shaped plug 9 can move to the inside of the first internal groove 7 and compress the first spring 8, and then the two plug blocks 11 are withdrawn from the inside of the clamping groove 5 through the two finger rings 21, so that the alarm device body 2 can be disassembled;
the solar cell panel 22 is installed at the top of the installation box 1, the alarm horns 23 are installed at the upper parts of the two sides of the installation box 1, the storage battery 24 is installed at the bottom inside the installation box 1, the storage battery 24 is electrically connected with the solar cell panel 22 and the alarm device body 2 through wires, and the alarm device body 2 is electrically connected with the alarm horns 23 through wires, so that electric power can be provided for the whole electricity discharge alarm device;
the mounting box 1 is mounted on an electric power tower, and the alarm device body 2 is connected with the electric power tower through a wire; when the adss optical cable is discharged, current appears on the surface of the electric power tower, the current on the surface of the electric power tower is transmitted to the alarm device body 2 through a conducting wire, and when the alarm device body 2 detects that the current exists, the alarm horn 23 is started to give an alarm to remind an operator to overhaul and maintain the adss optical cable and the electric power tower;
this alarm device is leaked to adss optical cable can effectually install and dismantle to installation and dismantlement easy operation are convenient, and are reliable and stable, thereby make things convenient for the workman to use the operation to alarm device is leaked, also effectual workman's work efficiency that has improved, consequently, this alarm device is leaked to adss optical cable can satisfy power equipment's user demand.
Example two:
as shown in fig. 7, the leakage current detection alarm circuit is disposed inside the alarm device body 2, and includes a leakage current detection circuit, a rectification circuit, and an alarm circuit.
The leakage current detection loop comprises a corrosion current control resistor R1, one end of the corrosion current control resistor R1 is connected with the ADSS optical cable through a lead, the other end of the corrosion current control resistor R1 is connected with one end of a step-down transformer T, the other end of the step-down transformer T is grounded, and the low-voltage end of the step-down transformer T is connected with a rectification circuit.
Rectifier circuit is bridge rectifier diode D, including D1 end, D2 end, D3 end, D4 end, and D4 end and step-down transformer T's low-voltage end link to each other, and D1 end and resistance R2's one end are connected, and R2's the other end and electric capacity C's one end link to each other, and electric capacity C's the other end and D3 end link to each other.
The warning loop includes resistance R3, resistance R4, variable resistance R5, LED warning light 25, alarm horn 23, resistance R3 and LED warning light 25 establish ties the back and connect in parallel with electric capacity C again, resistance R4, reconnection to triode Q's base b after variable resistance R5 establishes ties, triode Q's projecting pole e connects the D3 end, triode's collecting electrode C establishes ties alarm horn 23 in proper order, DC power supply DC connects triode Q's transmitter e.
Example three:
as shown in fig. 9, the adss optical cable electricity leakage alarm device comprises a clamp support 33 arranged on an iron tower 35, wherein an insulator 34 and an installation box 1 are arranged on the clamp support 33, an alarm device body 2 is arranged in the installation box 1, a grounding end of the alarm device body 2 is sequentially connected with the support through a lead, the iron tower 35 is finally connected with the ground, a detection end of the alarm device body 2 is electrically connected with the top end of the insulator 34 through a connecting wire 32, and the insulator 34 is arranged between the clamp support 33 and a U-shaped ring 31.
The ADSS cable 29 is provided with a pretwisted protective filament 30. The preformed armor rods are connecting fittings used for overhead power conductors and overhead power cable terminals, suspensions, joints and the like. The preformed armor rods appeared in the united states in the first 40-50 years of the 20 th century, with the initial product being spiral armour rods used for stress concentration location of bare conductors and protection of locations of galvanic corrosion and arc burning. Through development for many years, the preformed armor rod hardware is widely applied to the fields of power transmission and distribution, optical fiber communication, electrified railways, cable televisions, buildings, agriculture and the like.
The iron tower 35 of the transmission line is connected with the clamp support 33 in a conductive way, the U-shaped ring 31 is connected with one end of the insulator 34, the other end of the insulator 34 is installed on the clamp support 33 through a bolt, the ADSS optical cable 29 is connected with the U-shaped ring 31 through the pre-twisted protective wire 30, the installation box 1 is connected with the clamp support 33, the step-down transformer T of the electricity leakage detection alarm circuit in the alarm device body 2 is connected with the insulator 34 through the resistor R1 and the connecting wire 32 at the primary detection end, and the primary grounding end is grounded through the iron tower 35
When corrosion current occurs to the ADSS optical cable, the corrosion current is transmitted to the electricity leakage detection alarm circuit through a wire, the resistance R1 for controlling the corrosion current in the electricity leakage detection alarm circuit controls the corrosion current in a safe range, the current is adopted to reduce the voltage and rectify the current to emit light for the LED warning lamp 25 to transmit electric energy, the normal work of the device is displayed, and the variable resistance R5 and the resistance R4 set the current;
when the corrosion current exceeds the set current value, the collector c and the transmitter e of the triode Q are conducted, and the alarm horn 23 is started to give an alarm to remind the patrolman to check.
Example three:
as shown in fig. 8, the remote electricity discharge detection alarm module is arranged inside the alarm device body 2, and includes a current detection unit, a wireless transmission unit, a storage battery, a photovoltaic controller, and a solar panel.
The current detection unit and the wireless transmission unit are in communication connection through a cable and are used for transmitting detected current leakage information to a server or other terminals through the wireless transmission unit.
The storage battery is electrically connected with the photovoltaic controller, the solar cell panel and the wireless transmission unit and used for providing power for each power utilization unit.
The photovoltaic controller is electrically connected with the solar panel and used for rectifying, stabilizing voltage and controlling charging and discharging of the solar panel.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
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| CN202122775113.7U CN217639466U (en) | 2021-11-13 | 2021-11-13 | Adss optical cable discharge alarm device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115940059A (en) * | 2023-01-19 | 2023-04-07 | 福州理工学院 | An anti-seismic joint system for building electrical pipelines |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115940059A (en) * | 2023-01-19 | 2023-04-07 | 福州理工学院 | An anti-seismic joint system for building electrical pipelines |
| CN115940059B (en) * | 2023-01-19 | 2026-01-09 | 福州理工学院 | A seismic joint system for building electrical wiring |
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