CN101252056A

CN101252056A - Switch device of overhead electric power line compound wire automatic melting ice

Info

Publication number: CN101252056A
Application number: CNA2008100308892A
Authority: CN
Inventors: 肖明训
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-03-25
Filing date: 2008-03-25
Publication date: 2008-08-27

Abstract

The invention relates to an automatic ice melting switching device for a composite conductor of an overhead power line, consisting of a switch and a controller, wherein, the switch is connected in series on a jumper wire of each phase conductor of an ice melting partition point of the line; the controller is arranged on a switch outer shell or the jumper wire near the switch outer shell; a major loop of the switch is a composite loop which consists of a feedthrough double loop and a double loop provided with a switch, and the two double loops are isolated with each other; a composite double loop on one end of the switch is integrated into a loop with double loops of jumper wires for electric connection; a composite double loop on the other end of the switch is respectively and electrically connected with the double loops of the jumper wires. The controller switches on or off a loop of the composite conductor through comparison of the weight of an icing rack after icing and the ice coating thickness setting value when ice melting is started by a weight-measuring spring corresponding to the conductor, and the composite conductor is operated in the form of full section or reduced section. When the conductor is operated in the form of reduced section under normal load current, coated ice on the conductor is melted due to increased heat generation caused by impedance increase, and ice melting of the icing rack is simultaneously performed through heat transmission.

Description

The switching device of overhead electric power line compound wire automatic melting ice

Affiliated technical field

The invention belongs to a kind of switching device that is used for overhead electric power line compound wire automatic melting ice.

Background technology

Since overhead transmission line arranged, icing had just become its No.1 killer.In order to protect overhead power line, recent decades, people have thought that various ways avoid the harm of icing to overhead power line.Wherein use many mainly containing in China at present: anti-ice design method, short circuit melting ice method and overcurrent melting ice method etc.But anti-ice design method track investment and maintenance cost are higher; Need stop power supply for a long time during the molten ice of short circuit melting ice method, and complicated operation, automaticity is low and it is dumb etc. to move to the user; Traditional overcurrent melting ice method need change the operational mode of system or increase special molten ice transformer, also has complicated operation equally, automaticity is low and move inflexible problem.So occur in specifically in the freezing disaster of seven provinces such as Hunan, Guizhou, Jiangxi in January, 2008, due effect is not played in the molten ice measure of these traditional anti-ice substantially, so that caused because the serious icing of aerial condutor causes overhead power line a large amount of bar and broken string, make electrical network be in the state of collapse and paralysis, directly economic loss is up to becoming hundred billion yuan, brought great influence for people's productive life and entire society, indirect economic loss can't be estimated especially.At present country haves no alternative but determine to improve the anti-ice design grade of overhead power line, with the anti-ice of regulation design standard originally be met in 30 years one bring up to 50 years, that met in 50 years one brings up to 100 years.What deserves to be mentioned is that all do not reach so long the useful life of overhead power transmission line road facility (comprising shaft tower and lead) itself, after improving anti-ice design standard, newly-built investment with the overhead power line of transforming the anti-ice of needs will become hundred billion increase, and later maintenance cost is also with corresponding improve.

Summary of the invention

At the existing shortcoming and defect of measure that is used for the molten ice of the anti-ice of overhead power line at present, the invention provides a kind of switching device of overhead electric power line compound wire automatic melting ice, it is installed on the wire jumper of the every phase conductor of overhead power line molten ice waypoint that adopts compound wire, according to the pairing icing weight of the ice covering thickness on the lead, when the circuit icing reaches the ice covering thickness of the initial molten ice of adjusting, automatically make it withdraw from the current-carrying operation inner conductor loop disconnection of compound wire by it, only keep the outer layer conductor of compound wire to continue current-carrying, compound wire is in and falls the cross section running status, the impedance of current carrying conductor increases, under by normal transmission current, the caloric value of current carrying conductor is strengthened, reach the purpose of molten ice.It can not increase the transmission current of circuit keeping not changing the operational mode of system in user's power supply, and the lead of overhead power line is carried out ice full automatic segmentation and selectively molten, avoids the harm of icing to overhead power line.

The technical solution adopted for the present invention to solve the technical problems is: on the overhead power line that adopts compound wire, icing situation according to different highway sections is divided into several molten stades with circuit, the switching device of installing one cover automatic melting ice on every phase conductor of each molten ice waypoint, device is made up of switch sections and control section, switch sections series connection is installed on the wire jumper of circuit, control section be installed on the shell of switch sections or on the wire jumper near the position of switch sections shell.

Switch sections mainly is made up of the switch and the shell in composite conductor, one of them loop of break-make composite conductor.Composite conductor comprises the conductor in two loops, the conductor in one of them loop leads directly to, on the conductor in another loop switch is housed, insulate between the conductor in two loops, at a wherein end of switch, synthetic one road electricity in the double loop of its Composite Double loop and wire jumper is connected, at the other end of switch, the conductor of belt switch is only connected with the inner conductor electricity of circuit compound wire, and straight-through conductor is only connected with the outer layer conductor electricity of circuit compound wire.The conductor of straight-through conductor and belt switch can be coaxial composite structure, also can be compound layout side by side.When adopting coaxial composite structure, the conductor that is positioned at the center is as straight-through conductor, and switch is located on the outer contact loop, and the conductor of belt switch can promptly unite two into one with straight-through conductor in fracture one side of its switch.Switch can be for mechanical or electronic type.During for mechanical contact formula switch, switch adopts solenoid and power spring divide-shut brake, for this reason, with switch supporting current transformer, solenoid and power spring arranged, the current transformer that is contained on the composite conductor loop provides electric current to solenoid, Attraction strap moving contact by solenoid separates and the compression power spring energy-storage, current transformer must with straight-through conductor or simultaneously with the conductor of straight-through conductor and belt switch as Primary Conductor, the secondary coil and the solenoid of current transformer are connected in series, the two ends access controller after being connected in series.Switch contact is enclosed within the both sides of outer contact fracture and connects with the outer contact electricity, the movable core of moving contact afterbody and solenoid is fixed together, power spring adopts the compression spring to withstand on the afterbody of moving contact and coaxial with solenoid, and moving contact is by power spring promotion and maintenance and the connection of fixed contact electricity.Switch sections is sealed in its housing, and housing adopts the structure of two joint butt joints, keeps insulation by insulating barrier and the live part that is located at its inner surface, and two end seals of housing divide fashionable cushion pad as contact simultaneously.

Control section mainly comprises control box, contact box, normally opened contact, contact carriage, accumulated ice frame, icing weight sensing spring, servomotor, molten ice startup value adjust nut, contact carriage mounting rod, the sliding mouthful anti-icing cover of servomotor and anti-icing baffle plate.Controller be installed on the outer surface of switch case by control box or on the wire jumper near the position of switch, control box be upper end open with cover with the bottom container of at least one through hole is arranged, it is made with the material of good heat conductivity, the first half in the control box is nested with a contact box, it is made with insulating material, the upper end of contact box also is an opening, bottom centre at it is provided with at least one through hole, at least one pair of normally opened contact is installed in the box of contact, and the icing weight sensing spring is positioned at the Lower Half of control box and is supported on the bottom of control box; The top of servomotor also is positioned at the Lower Half of control box, servomotor is made of relay plate and relay bar, the relay bar is fixedlyed connected with the relay plate and is hung over the upper end of icing weight sensing spring by the relay plate, the bottom outlet that the relay bar passes icing weight sensing spring and control box is connected by the nut of adjusting with the accumulated ice frame, at least two through holes are arranged on the relay plate, the relay plate can move up and down along the contact carriage mounting rod by this through hole, when the contact carriage mounting rod was tubular structure, the relay plate was also by the corresponding bar structure that changes into of plate structure.The contact carriage mounting rod comprises that at least two its tops are the bar structures that connect together, or on the telescopic section of corresponding icing weight sensing spring, have a tubular structure of at least two notches, its top is positioned at the contact box, contact carriage is installed in its tip position, the contact carriage mounting rod is passed down through the relay plate and the icing weight sensing spring of servomotor from the contact box, the bottom outlet that passes control box is again fixedlyed connected with the accumulated ice frame, contact carriage adopts elastic support structure, the contact of contact carriage adopts twisting to contact with the contact-making surface of normally opened contact, elasticity by contact carriage keeps in touch pressure and anti-shake, insulate between contact carriage and its mounting rod.By regulating the molten ice startup value nut of adjusting the relay plate is slided up and down along the contact carriage mounting rod, change the thrust size of icing weight sensing spring to servomotor, start icing (thickness) weight of molten ice thereby adjust, the control box rear surface is provided with anti-icing cover, with arranged outside on the relay bar of servomotor anti-icing baffle plate is arranged near the control box bottom, in case servomotor is stuck by icing in the control box bottom, the accumulated ice frame is made with thin metallic tubd, the shape of accumulated ice frame comprises the arbitrary shape that can prevent Bird's Nest and reduce wind surface, be connected with normally opened contact in the box of contact respectively after the series connection of Current Transformer Secondary coil and solenoid, when the great setting value in weight sensing spring power of the ice on the accumulated ice frame, the accumulated ice frame drives the contact carriage mounting rod by servomotor compression weight sensing spring and moves downward the normally opened contact closure, making current instrument transformer secondary coil and solenoid series loop, the secondary current of current transformer produces electromagnetic force by solenoid, the thrust that this electromagnetic force overcomes power spring makes the iron core adhesive of solenoid, the moving contact that drive is connected with moving iron core separates with fixed contact, disconnect the composite conductor loop, thereby disconnect the inside conductor part of the circuit compound wire that is connected with composite conductor, the whole current concentrations that force the transmission of circuit compound wire are on the outer conductor part, cross section current-carrying operation falls in compound wire, under normal transmission current, because the impedance of current carrying conductor increases and makes that its heating is molten ices.When the molten ice of line conductor moves, making heat on switch case and the wire jumper pass to the accumulated ice frame through control box by heat transfer process makes itself and line conductor melt ice simultaneously, when the ice on the accumulated ice frame weighs less than the setting value of weight sensing spring power, weight sensing spring drives the contact carriage mounting rod by servomotor and moves upward, the normally opened contact of Current Transformer Secondary coil and solenoid series loop is disconnected, solenoid is because of the cutout loss of excitation, moving contact is connected with fixed contact under the effect of power spring and is kept, and line conductor recovers the operation of total cross-section current-carrying.

The meteorological condition in the long and different highway sections of circuit is divided into several molten stades according to the meteorological condition and being provided with of combined circuit strain section in different highway sections with the whole piece circuit, not simultaneously so that selectively melt ice according to the concrete condition in different highway sections.

The invention has the beneficial effects as follows, this device combines with the compound wire of overhead power line, can make things convenient for, be implemented in flexibly, reliably the normal operating mode that does not change electric power system, on the basis of normal load current, do not strengthen line current, do not interrupt under the situation of user's power supply, automatically finishing the molten ice of power line lead.Apparatus structure is simple, and is easy to manufacture, easy for installation, the reliability height, and long service life, implementation cost and maintenance cost are low.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is the sectional arrangement drawing of an embodiment of the present invention.

Fig. 2 is the scheme of installation of an embodiment of the present invention.

Among Fig. 1, the 1. straight-through conductor of composite conductor, 2. insulating barrier between composite conductor, 3. the outer contact of composite conductor, the 4. shell end of switch sections sealing, the 5. housing of switch sections, 6. Current Transformer Secondary coil, 7. current transformer core, 8. fixed contact, 9. contact fracture reinforced insulation layer, 10. moving contact, 11. housing inner insulating layers, 12. moving contact and solenoid movable core connecting bolt, 13. iron core in the solenoid, 14. solenoid carriages, 15. solenoid outer iron cores, 16. solenoid, 17. the solenoid iron core bracket, 18. power springs, 19. secondary coils connect and lead-out wire, 20. control box, 21. contact carriage, 22. contact boxes, 23. normally opened contacts, 24. sliding mouthful anti-icing cover, 25. the relay bar, 26. control lids, 27. relay plates, 28. icing weight sensing spring, 29. sliding mouthful anti-icing baffle plate, 30. contact carriage mounting rods, 31. accumulated ice framves, the nut 32. molten ice startup value is adjusted.

Among Fig. 2,33. variable overflow section aerial condutors, 34. strain clamps, 35. insulators, 36. gold utensils, 37. shaft tower frameworks, the connector of 38. wire jumpers and switch, 39. switches, 40. controllers.

Embodiment

Among Fig. 1, switch case (5) is divided into two joints, adopt the blue connected mode of valve, switch has been assembled the whole housing in back and has been sealed, straight-through conductor (1), outer contact (3) and insulating barrier therebetween (2) constitute coaxial composite conductor, this composite conductor passes the two ends, center of switch case (5) and stretches out outside the switch case (5), in the switch case (5) of sealing, current transformer part (comprising secondary coil (6) and iron core (7)), fixed contact (8), contact fracture reinforced insulation layer (9), moving contact (10), the solenoid part (comprises iron core (13) in the solenoid, solenoid carriage (14), solenoid outer iron core (15), solenoid (16) and solenoid iron core bracket (17)), power spring (18) and sealing shroud (4) are arranged successively and are all coaxial with composite conductor, sealing shroud (4) while is as the cushion pad of fixed contact (8) and moving contact (10), switch case (5) keeps insulating by the live part of dielectric isolation layer (11) with switch, mechanical contact formula switch is located on the outer contact (3), outer contact (3) unites two into one at fracture one side and the straight-through conductor (1) of switch, fixed contact (8) is sleeved on outer contact (3) and goes up and directly be electrically connected with outer contact (3), current transformer is enclosed within on the fixed contact (8), moving contact (10) directly is sleeved on the end that is positioned at switch case (5) that outer contact (3) and straight-through conductor (1) unite two into one, both electricity are connected and moving contact (10) can slide along the conductor segment that unites two into one, incision position in switch contacts is provided with reinforced insulation layer (9), solenoid is located at the tail end of moving contact (10), the solenoid iron core is divided into interior iron core (13) and outer iron core (15), interior iron core (13) is fixed together and can moves with moving contact (10) with moving contact (10), outer iron core (15) is fixed in the switch case (5) by coil bracket (14) and iron core bracket (18) with solenoid (16), power spring (18) is enclosed within the interior sky of moving contact (10) the tail end solenoid iron core bracket (18) on the conductor that unites two into one, promotion and the fixed contact (8) of moving contact (10) by power spring (18) closes a floodgate and keeps in touch pressure, solenoid (16) is connected with the secondary coil (6) of current transformer, two ends after the series connection cause controller through lead-out wire (19), when this series loop is closed, the secondary current that the current transformer induction produces produces electromagnetic force by solenoid (16), the thrust that electromagnetic force overcomes power spring (18) makes the iron core adhesive of solenoid, the interior iron core (13) of solenoid drives connected moving contact (10) to be separated with fixed contact (8), disconnect the composite conductor loop, and compression power spring (17) makes it energy storage, when secondary coil (6) series loop of solenoid (16) and current transformer disconnects, solenoid is because of the cutout loss of excitation, moving contact (10) is connected with fixed contact (8) under the effect of power spring (18) and is kept, and connects the composite conductor loop.

Controller is fixedly mounted on switch case (5) below by control box (20), the upper end of control box (20) be opening and have a lid (26), at least one through hole is arranged at its bottom, the first half in the control box (20) is nested with a contact box (22), it is made with insulating material, the upper end of contact box (22) also is an opening, is provided with at least one through hole in its bottom centre, and at least one pair of normally opened contact (23) is installed in contact box (22); The secondary coil two ends lead-out wires (19) of switch respectively with contact box (22) in normally opened contact (23) be connected; Icing weight sensing spring (28) is positioned at the Lower Half of control box (20) and is supported on the bottom of control box (20); The top of servomotor also is positioned at the Lower Half of control box (20), servomotor is made of relay plate (27) and relay bar (25), relay bar (25) is fixedlyed connected with relay plate (27) and is hung over the upper end of icing weight sensing spring (28) by relay plate (27), the bottom outlet that relay bar (25) passes icing weight sensing spring (28) and control box (20) is connected by the nut of adjusting (32) with accumulated ice frame (31), the relay plate has at least two through holes on (27), contact carriage mounting rod (30) comprises that at least two its tops are the bar structures that connect together, or on the telescopic section of corresponding icing weight sensing spring (28), have a tubular structure of at least two notches, its top is positioned at contact box (22), contact carriage (21) is installed in its tip position, contact carriage mounting rod (30) is passed down through contact box (22) bottom centre hole from contact box (22), the relay plate (27) of servomotor and icing weight sensing spring (28), the bottom outlet that passes control box (20) is again fixedlyed connected with accumulated ice frame (31), contact carriage (21) is an elastic support structure, the contact face of contact carriage (21) is that twisting contacts with the contact face of normally opened contact (23), and the elasticity by contact carriage (21) keeps in touch pressure and anti-shake; Contact carriage (21) insulate with its mounting rod (30); By regulating the molten ice startup value nut (32) of adjusting relay plate (27) is slided up and down along the jaw of contact carriage mounting rod (30), change the thrust size of icing weight sensing spring (28), start icing (thickness) weight of molten ice thereby adjust to servomotor; Sliding mouthful of anti-icing cover (24) is fixedly mounted on control box (20) rear surface, and the arranged outside that goes up near control box (20) bottom at the relay bar (25) of servomotor has anti-icing baffle plate (29), in case servomotor is stuck by icing in control box (20) bottom; Accumulated ice frame (31) is made with thin metallic tubd, the also line space of metal tube is minimum to be the twice that starts ice covering thickness when line conductor is molten to be iced, the diameter of metal tube equates with the external diameter of lead or is approaching, when the length overall of metal tube reaches the molten ice of startup setting value according to the ice covering thickness at line conductor, make the ice that is amassed on the accumulated ice frame (31) heavily for starting determining more than 1.1 times of molten ice setting value, the spacing of accumulated ice frame (31) and de-icer boot (24) and switch housing (5) is at least 2 times of wire icing thickness when starting molten ice, and the shape of accumulated ice frame (31) comprises the arbitrary shape that can prevent Bird's Nest and minimizing wind surface.Be connected with normally opened contact (23) in the contact box (22) respectively after the series connection of Current Transformer Secondary coil (6) and solenoid (16), when the great setting value in weight sensing spring power of the ice on the accumulated ice frame (31), accumulated ice frame (31) drives contact carriage mounting rod (30) by servomotor compression weight sensing spring (28) and moves downward normally opened contact (23) closure, making current instrument transformer secondary coil (6) and solenoid (16) series loop, when the ice on the accumulated ice frame (31) weighs less than the setting value of weight sensing spring power, weight sensing spring (28) drives contact carriage mounting rod (30) by servomotor and moves upward, and the normally opened contact (23) of Current Transformer Secondary coil (6) with solenoid (16) series loop disconnected.

Among Fig. 2, the switch sections of the switching device of overhead electric power line compound wire automatic melting ice (39) is serially connected on the wire jumper (33) of line conductor on the strain insulator shaft tower by joint (38), wire jumper (33) is the compound wire same with line conductor, controller (40) partial fixing is installed on the switch sections (39), switch sections (39) with the connected mode of wire jumper (33) is: an end therein, the inner conductor of wire jumper (33) is electrically connected with the outer contact (3) of switch composite conductor by transposition, the outer layer conductor of wire jumper (33) is electrically connected with the straight-through conductor (1) of switch composite conductor, at the other end, the ectonexine lead of wire jumper (33) is electrically connected with the straight-through conductor (1) and the outer contact (3) of switch composite conductor simultaneously, during the molten ice operation of line conductor, make heat on switch case (5) and the wire jumper (33) pass to accumulated ice frame (31) by heat transfer process and make itself and line conductor melt ice simultaneously through control box.

Claims

1. the switching device of an overhead electric power line compound wire automatic melting ice, it comprises the switch sections of at least one compound wire that access is single-phase and the switching control section of at least one, the switch sections series connection is installed on the molten wire jumper of icing on the every phase conductor of waypoint of line conductor, control section be fixedly mounted on the shell of switch sections or on the wire jumper near the position of the shell of switch sections, it is characterized in that: the major loop of switch sections is by a straight-through set composite of forming with a double loop insulated from each other that switch is housed, end at switch, synthetic one road electricity in the double loop of its Composite Double loop and wire jumper is connected, at the other end of switch, the double loop of its Composite Double loop and wire jumper electricity is respectively connected; Switching control section by comprise on one the shell that is fixedly mounted on switch sections or on the wire jumper near the locational control box of the shell of switch sections, comprise one the spring servomotor on the control box of being suspended on, comprise one the accumulated ice frame on the spring servomotor of being suspended on, comprise that its upper end of one is equipped with the contact carriage that the normally opened contact of control main switch secondary circuit opens and closes, the contact carriage mounting rod that lower end and servomotor are fixedlyed connected with the accumulated ice frame, and the secondary circuit with main switch of at least one pair of is connected into the contact composition of often opening.

2. the switching device of a kind of overhead electric power line compound wire automatic melting ice according to claim 1, it is characterized in that: the composite construction of the conductor in the conductor of straight circuit and the loop of belt switch comprises coaxial composite structure and composite construction side by side, when adopting coaxial composite structure, straight-through conductor is positioned at the center, switch is located on the outer contact loop, and the return conductors of belt switch can unite two into one at a wherein side and the straight circuit conductor of its switch fracture.

3. the switching device of a kind of overhead electric power line compound wire automatic melting ice according to claim 1, it is characterized in that: the main switch of set composite comprises mechanical and electronic type, when being mechanical contact formula switch, with switch supporting also comprise the current transformer that is contained on the composite conductor total loop, secondary coil solenoid that is connected in series and the power spring that is positioned at the moving contact afterbody with current transformer, switch contact is enclosed within the both sides of outer contact fracture and connects with the outer contact electricity, the movable core of moving contact afterbody and solenoid is fixed together, the normally opened contact of current transformer and two ends access controller after solenoid is connected.

4. the switching device of a kind of overhead electric power line compound wire automatic melting ice according to claim 1, it is characterized in that: switch sections is sealed in its housing, housing adopts the structure of two joint butt joints, keep insulation by insulating barrier and the live part that is located at its inner surface, two end seals of housing divide fashionable cushion pad as contact simultaneously.

5. the switching device of a kind of overhead electric power line compound wire automatic melting ice according to claim 1, it is characterized in that: controller comprises control box and accumulated ice frame, controller is fixedly mounted on by control box on the outer surface of switch case or on the wire jumper, the accumulated ice frame is suspended on the icing weight sensing spring that comprises by comprising one servomotor, the icing weight sensing spring is suspended on the control box, the upper end of contact carriage mounting rod is passed contact box bottom centre hole and is stretched in the box of contact, the relay plate and the icing weight sensing spring of servomotor passed in the lower end, and the bottom outlet that passes control box is again fixedlyed connected with the accumulated ice frame.

6. the switching device of a kind of overhead electric power line compound wire automatic melting ice according to claim 1, it is characterized in that: control box is the container that at least one through hole is arranged at the with cover and bottom of upper end open, the first half in the control box is nested with a contact box, the icing weight sensing spring is positioned at the Lower Half of control box and is supported on the bottom of control box, the top of servomotor also is positioned at the Lower Half of control box, the control box rear surface be provided with anti-icing cover and on the relay bar of servomotor the arranged outside near the control box bottom anti-icing baffle plate is arranged.

7. the switching device of a kind of overhead electric power line compound wire automatic melting ice according to claim 1, it is characterized in that: the upper end of contact box is an opening, bottom centre at it is provided with at least one through hole, and at least one pair of normally opened contact is installed in the box of contact, and the contact box is an insulating material.

8. the switching device of a kind of overhead electric power line compound wire automatic melting ice according to claim 1, it is characterized in that: the contact carriage mounting rod comprises that at least two its tops are the bar structures that connect together, or on the telescopic section of corresponding icing weight sensing spring, have a tubular structure of at least two notches, its top is positioned at the contact box, contact carriage is installed in its tip position, the contact carriage mounting rod is passed down through the relay plate of contact box bottom outlet and servomotor from the contact box, the bottom outlet that passes icing weight sensing spring and control box is again fixedlyed connected with the accumulated ice frame, contact carriage adopts elastic support structure, contact carriage is that twisting contacts with the contact-making surface of normally opened contact, insulate between contact carriage and its mounting rod.

9. the switching device of a kind of overhead electric power line compound wire automatic melting ice according to claim 1, it is characterized in that: servomotor is made of relay plate and relay bar, the relay bar is fixedlyed connected with the relay plate and is hung over the upper end of icing weight sensing spring by the relay plate, the bottom outlet that the relay bar passes icing weight sensing spring and control box is connected by the nut of adjusting with the accumulated ice frame, at least two through holes are arranged on the relay plate, the relay plate can move up and down along the contact carriage mounting rod by this through hole, when the contact carriage mounting rod was tubular structure, the relay plate was also by the corresponding bar structure that changes into of plate structure.

10. the switching device of a kind of overhead electric power line compound wire automatic melting ice according to claim 1, it is characterized in that: the accumulated ice frame is made with the metal tube of thin-walled, twice metal tube and that the line space minimum is got ice covering thickness when the startup line conductor is molten to be iced, the diameter of metal tube equates with the external diameter of lead or is approaching, when the length overall of metal tube reaches the molten ice of startup setting value according to the ice covering thickness at line conductor, the ice that makes on the accumulated ice frame to be amassed is heavily for starting determining more than 1.1 times of molten ice setting value, the spacing of accumulated ice frame and de-icer boot and switch housing is at least 2 times of wire icing thickness when starting molten ice, and the shape of accumulated ice frame comprises the different shape that can prevent Bird's Nest and minimizing wind surface.