CN201302835Y

CN201302835Y - Overhead wire for current-uninterrupted automatic ice-melting

Info

Publication number: CN201302835Y
Application number: CNU2008201584185U
Authority: CN
Inventors: 肖明训
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-09-09
Filing date: 2008-09-09
Publication date: 2009-09-02
Anticipated expiration: 2018-09-09

Abstract

The utility model relates to an overhead wire for current-uninterrupted automatic ice-melting. The current-carrying part comprises an insulated wire and a bare wire, all the cross sections of the wire are carried with current during the normal running at the same time, when the ice-melting is needed for the line, the insulated wire part is disconnected through a composite switching device, the normal working current of the wire fully passes through the cross section of the connected part, therefore, the current-carrying cross section of the wire is reduced, the current density of the over-current wire is increased, the impedance of the over-current wire is increased to cause the heat production to be increased, the temperature of the wire rises to enable the ice covered on the wire to be melted, the composite switching device is automatically ducted with the wire of the disconnected part during the ice-melting process after the ice-melting is finished, the wire is restored so that the current-carrying of all the cross sections normally runs, the line current is not required to be increased, the ice-melting of the line wire is fully and automatically finished under the condition that the electric power is transmitted to the user normally, and the harm of the icing to the overhead transmission line is avoided. The utility model has the advantages of flexible running, high reliability and automation, low cost of investment and less running expense.

Description

The automatic melting ice aerial condutor does not have a power failure

Affiliated technical field

The utility model relates to a kind of running current that utilizes link tester to cross, and is keeping in the normal transmission of electric energy of user, cooperates molten ice switching device to realize the aerial condutor of the molten ice of anti-automatically ice.

Background technology

The current density that the electric current that the increasing power line lead passes through increases lead makes the lead heating, realizes the method to the molten ice of overhead transmission line conductor, is the present molten ice of the anti-ice of the overhead transmission line maximum a kind of method that adopts that is used in electric power system.But the method for traditional increasing current in wire density is that to keep conductor cross-section constant, and electric current that lead passes through realizes to strengthen, therefore is the problem of bringing what the electric current of enlarged portion come from? so people have just invented short circuit melting ice method and overload melting ice method.The short circuit melting ice method is that the overhead transmission line conductor of icing is carried out short circuit, makes it produce powerful short circuit current and the current density of lead is increased greatly and generates heat, and the icing on the lead is melted; The overload melting ice method is by changing the operating structure of electrical network, allows overhead transmission line conductor much bigger load current by than its normal operation the time cause lead during icing and generates heat, and makes sleet can not form icing on lead.

When adopting the short circuit melting ice method to melt ice, circuit can not be undertaken the task of sending electricity to system user in molten ice process, thereby influence the normal operation of whole electric power system, and melt ice wiring, system call and operate all more complicated, reason owing to molten ice power supply, the distance of molten ice is also very limited, often because can not find suitable molten ice power supply, can't realize the total length of circuit is melted ice; When adopting the overload melting ice method; will be by bigger adjustment be carried out in aspects such as the operating structure of electric power system especially electrical network and system protection; could realize strengthening the purpose of line load electric current; this adjustment is very complicated and difficulty, is impossible more for a long time even at all at the circuit number that adopts the molten ice of this method especially.The electric grid large area broken string that the freezing disaster that occur in seven provinces such as Hunan, Guizhou, Jiangxi in January, 2008 specifically causes, the bar that falls, the electrical network of some areas almost is in the state of collapse and paralysis, this wherein has many circuits to be provided with these molten ice measures, because the existence of the problems referred to above makes these molten ice measures not bring into play due effect.The current direct economic loss that freezing disaster caused is up to exceeding 100 billion, and can't estimate for simultaneously people's production and very big influence that life brings and indirect economic loss and social influence especially.

Summary of the invention

In order to overcome the existing problem and shortage of conventional method that is used for the molten ice of the anti-ice of overhead transmission line, the utility model provides a kind of automatic melting ice aerial condutor that do not have a power failure, it is keeping under the constant condition of circuit running current, strengthen the current density of current carrying conductor by the current-carrying cross section of reducing lead, thereby the caloric value that strengthens lead reaches the purpose of molten ice, it can keep in the normal transmission of electric energy of user, realize the molten ice of anti-automatically ice of overhead transmission line conductor, avoid the harm of icing overhead transmission line.

The technical scheme that its technical problem that solves the utility model adopts is: the current carrying part of overhead power transmission conducting wire adopts share split lead layering strand system to form, its current carrying conductor is common composition of plain conductor of adopting the insulated conductor and the partial cross section of partial cross section, and the total cross section of lead can form the combination at least two kinds of current-carrying cross sections insulated from each other.Insulated conductor both can adopt the lead of many branch strand insulations to form, when the number of plies of current carrying conductor when two-layer, also can adopt the mode of the whole layer insulation of inner conductor, plain conductor is arranged in skin.The whole current-carrying of lead total cross section during normal the operation, when circuit need melt ice, by being located at the insulated conductor of the combination switch device disconnection internal layer on the lead, the outer layer conductor that running current is all never disconnected passes through, by reducing the current-carrying cross section of lead, increase the current density of current carrying conductor, make current carrying conductor impedance increase and cause its caloric value to increase, conductor temperature raises and the icing on the lead is melted, combination switch device was connected the lead that is disconnected when molten ice moves automatically after molten ice was finished, and recovered the operation of lead total cross-section current-carrying.

The total cross section of lead is selected according to a conventional method, and the conductor cross-section of current-carrying is determined the circuit running current by equaling during molten ice as the anti-molten ice cross section of obtaining of ice melting current, generally total conductor cross-section 1/4 to 3/4 between choose.The compressive resistance of dielectric isolation layer is more definite by economy, in order to reduce the thickness of dielectric isolation layer, its compressive resistance is unsuitable too high, the general kilovolt level that adopts gets final product, maximum segment length when the molten ice of the anti-ice of circuit moves, the dielectric voltage withstand intensity that is no more than dielectric isolation layer with the pressure drop on the molten ice target phase lead is determined.In order to adapt to the section selection of molten ice needs, outer layer conductor can also be adopted share split insulated conductor and share split plain conductor arrange with layer, cross section numerical value that can be as required during molten ice, selection portion is divided outer field share split insulated conductor participation current-carrying.The share split lead generally adopts circular section shape, for ease of being done, the external diameter of lead is adapted to lead total cross section and lead during fabrication to the adjusting of molten ice cross section value, with improve the integrally-built performance of lead, also the cross section of share split lead can be made the shape of various abnormity.

The beneficial effects of the utility model are, it is by cooperating (the separate case application of molten ice switching device, application number: 200810030889.2), the normal operating structure of electrical network can not changed, need not change the mode of connection, do not strengthen line current, the tap that only needs suitably to adjust transformer improves sending end voltage, the running current that can utilize link tester to cross, keeping realizing that in the normal transmission of electric energy of user the anti-ice to line conductor melts ice, avoid icing that circuit is worked the mischief, whole apparatus system flexible operation, reliability and automaticity height, cost of investment is low, and operating cost is few.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is that the utility model inner conductor adopts whole layer insulation to adopt the total cross section schematic diagram that divides strand insulation with outer layer segment.

Fig. 2 is the total cross section schematic diagram that insulated conductor of the present utility model all adopts the branch strand insulation.

Fig. 3 is that the utility model inner conductor adopts whole layer insulation to be the total cross section schematic diagram of odd-shaped cross section share split plain conductor with skin.

Among Fig. 1, Fig. 2 and Fig. 3,1.. heart yearn, 2.. the share split plain conductor, 3.. the share split insulated conductor, 4.. the whole layer insulation of internal layer share split plain conductor, 5.. odd-shaped cross section share split plain conductor.

Embodiment

In the embodiment shown in fig. 1, aerial condutor by heart yearn 1., the share split plain conductor 2., the share split insulated conductor 3. with internal layer share split plain conductor whole layer insulation 2. 4. form, heart yearn 1., 2. layering strand system successively from inside to outside of share split plain conductor, the share split insulated conductor 3. with the share split plain conductor 2. the mixed layer strand outside the whole layer insulation 4. 2. of internal layer share split plain conductor.

In embodiment illustrated in fig. 2, the heart yearn of aerial condutor 1. with 3. layering strand system successively from inside to outside of share split insulated conductor, 2. 3. the outer share split insulated conductor that adopts mix the strand system with the share split plain conductor.

In the embodiment shown in fig. 3, aerial condutor by heart yearn 1., the share split plain conductor 2., 5. 4. the whole layer insulation 2. of internal layer share split plain conductor form with outer odd-shaped cross section share split plain conductor, heart yearn 1., 2. layering strand system successively from inside to outside of share split plain conductor, 5. the share split plain conductor of odd-shaped cross section twists outside the whole layer insulation 4. 2. of internal layer share split plain conductor.

Claims

1. automatic melting ice aerial condutor that do not have a power failure, its adopts share split lead layering strand system to form, and it is characterized in that: in an aerial condutor, its current carrying conductor is made of jointly the plain conductor of the insulated conductor of partial cross section and partial cross section.

2. a kind of automatic melting ice aerial condutor that do not have a power failure according to claim 1 is characterized in that: the insulation system that constitutes insulated conductor comprise the branch strand insulation with whole layer insulation.

3. a kind of automatic melting ice aerial condutor that do not have a power failure according to claim 1, it is characterized in that: plain conductor is arranged in skin.

4. a kind of automatic melting ice aerial condutor that do not have a power failure according to claim 1 is characterized in that: the cross sectional shape of share split lead comprises circular and various abnormity.