CN104332929A - Single-ground wire ice melting method - Google Patents

Abstract

The invention discloses a method for melting ice with a single ground line. The method includes selecting the ground line of the target ice-melting section; selecting a first tower and a second tower, wherein the first tower is a strain tower, and the first tower Compared with other tension towers, the head end of the target ice-melting section ground line is closest, and the second pole tower is closest to the end of the target ice-melting section ground line than other pole towers; for the first pole tower and the second pole tower The second tower includes the ground wire of the target ice-melting section between the first towers for insulation transformation; disconnect the ground wire on the first tower and lead it down with an insulated cable, and connect it to the three-phase The positive pole of the rectifying device is connected, and the negative pole of the three-phase rectifying device is connected with the grounding device; the power supply device is controlled to supply power to melt ice with a single ground wire. The present invention significantly reduces the power supply capacity required for melting ice by a single ground wire and the power requirement of a three-phase rectifier circuit, consumes less electric energy in the process of melting ice, and requires less work to transform the ground wire, and is economical and practical.

Description

A method for melting ice with a single ground wire

technical field

The invention relates to the field of ice melting of power transmission lines, in particular to a method for melting ice of a single ground wire.

Background technique

In recent years, the southern part of my country has suffered from rain, snow and freezing disasters continuously, resulting in icing of overhead transmission lines, which poses a great threat to the safe and stable operation of overhead transmission lines, and also causes accidents such as disconnection, tower collapse and tripping almost every year. , seriously affecting the reliability of the power supply system. After several years of hard work, my country's power grid currently has more experience and means in melting ice in conductors, but lacks experience in melting ice in ground wires and has no economical and effective means. If the ground wire melting problem is not solved, once the ice melts, the ground wire will sag, and the insulation distance between the ground wire and the conductor will be reduced, which may lead to short-circuit tripping accidents.

In the prior art, a single ground wire is often used to melt the ice by using existing wires or additional wires to form a return path with a single ground wire, that is, firstly insulate the entire ground wire, and then Use a super-capacity power source such as a substation to melt the ice on the entire ground wire that may be hundreds of kilometers long. However, the length of the ice-covered section of transmission lines in most areas of my country is only between 1/20 and 1/3 of the total length of the line. It can be seen that the existing method of melting ice for single ground wires requires not only Power outage processing for transmission lines brings great inconvenience to the life of users. In addition, most importantly, it also causes an increase in renovation costs and workload of workers, causing a great waste of electric energy.

Therefore, how to provide an economical and practical single ground line deicing method is a problem to be solved by those skilled in the art.

Contents of the invention

The purpose of the present invention is to provide a method for melting ice with a single ground wire, which significantly reduces the power supply capacity required for ice melting and the power requirements of the three-phase rectifier circuit, consumes less power during the ice melting process, and reduces the workload involved in ground wire transformation Small, economical and practical.

In order to solve the above technical problems, the present invention provides a method for melting ice with a single ground wire, including:

Step A: Select the ground line of the target ice-melting section;

Step B: Select the first tower and the second tower, wherein the first tower is a tension tower, and the first tower is closest to the head end of the target ice-melting section ground line than other tension towers. The second tower is closest to the end of the target ice-melting section ground line than other towers;

Step C: Insulate and transform the ground wire of the target ice-melting section between the first tower and the second tower, including the first tower;

Step D: Disconnect the ground wire on the first tower and lead it down with an insulated cable, and connect it to the positive pole of the three-phase rectification device connected to the power supply device, and connect the negative pole of the three-phase rectification device to the grounding device;

Step E: Control the power supply device to supply power to melt ice with a single ground wire.

Preferably, in step A, the ground line of the target ice-melting section is a complete ice-covering section ground line.

Preferably, in step A, the target ground line of the ice-melting section is a part of the ground line of the complete ice-covered section.

Preferably, step B includes:

The first tower and the second tower are selected, and the selection makes the ground line of the target ice-melting section completely included between the first tower and the second tower.

Preferably, between step B and step E, also include:

The grounding body in the grounding device of the second tower is extended by a preset length.

Preferably, the insulation transformation specifically includes:

A lightning arrester or an insulator with a gap is arranged between the ground wire of the target ice-melting section and the tower.

Preferably, the power supply device is a substation.

Preferably, the grounding device in step D is specifically the ground grid of the substation.

Preferably, the power supply device is a power generation vehicle.

Preferably, the grounding device in step D is specifically the grounding device of the first tower.

The method of melting ice for a single ground wire provided by the present invention is different from the previous method of using a super-large capacity power supply to melt the ice of the ground wire in the entire line. The ice-melting treatment of the ground wire significantly reduces the power supply capacity required for ice-melting and the power requirements of the three-phase rectifier circuit. The power consumption in the ice-melting process is less, and the workload involved in the ground wire transformation is small, economical and practical. The present invention does not need to carry out power outage processing on the power transmission line when the ice is melted, which brings great convenience to users' lives.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the prior art and the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is a flow chart of the process of a single ground line ice melting method provided by an embodiment of the present invention;

Fig. 2 is a flow chart of the process of another single ground line ice melting method provided by the embodiment of the present invention;

Fig. 3 is the schematic diagram of the process of the single ground wire melting ice when the power supply device provided by the present invention is a substation;

Fig. 4 is a schematic diagram of the process of melting ice on a single ground line when the power supply device provided by the present invention is a generator car.

Detailed ways

The core of the present invention is to provide a method for melting ice with a single ground wire, which significantly reduces the power supply capacity required for ice melting and the power requirement of the three-phase rectifier circuit, consumes less power during the ice melting process, and reduces the workload involved in ground wire transformation Small, economical and practical.

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Embodiment one

Please refer to FIG. 1 . FIG. 1 is a flow chart of the process of a single ground line ice melting method provided by the present invention. The method includes:

Step s101: Select the ground line of the target ice-melting section;

It is understandable that since a whole ground line may include multiple intervals of ice-covered sections, or a section of the ice-covered section of the ground line is very long, the capacity of the power supply device is insufficient, and ice melting needs to be segmented. Therefore, first determine the target The ground line of the ice melting section. But here we do not specifically limit the ground line of the ice-covered section in the above-mentioned situation as the ground line of the target ice-melting section, and the ground line of the target ice-melting section that can realize the technical effect of the present invention is within the scope of protection of the present invention within.

Step s102: Select the first tower and the second tower, wherein the first tower is a tension tower, the first tower is closest to the head end of the ground line of the target ice-melting section than other tension towers, and the second tower is farther away from the target than other towers The end of the ground line of the ice-melting section is nearest;

It is understandable that after determining the ground line of the target ice-melting section, select the tower at the head and end of the ground line of the target ice-melting section, and select the tension tower closest to the head end of the ground line of the target ice-melting section compared with other tension towers As the first tower, the first tower is a strain tower, and the tower closest to the end of the target ice-melting ground line is selected as the second tower.

Step s103: Insulate the ground wire of the target ice-melting section between the first tower and the second tower, including the first tower;

It can be understood that after the first tower and the second tower are determined, the ground wire of the target ice-melting section between the first tower (including the first tower) and the second tower is insulated and reconstructed. The insulation transformation here can be to install lightning arresters or insulators with gaps between the ground wire of the target ice-melting section and the pole tower. Of course, the insulation transformation may also be in other situations, which are not specifically limited here, and the insulation transformation that can achieve the purpose of the present invention is within the protection scope of the present invention.

Step s104: Disconnect the ground wire on the first tower and lead it down with an insulated cable, and connect it to the positive pole of the three-phase rectification device connected to the power supply device, and connect the negative pole of the three-phase rectification device to the grounding device;

It can be understood that if the first tower is relatively close to the substation, for example, the distance between the two is less than three kilometers, the insulation transformation line in the previous step can be extended accordingly, so that the substation can be selected as the power supply device, then at this time The grounding device of the substation is the ground grid of the substation; if the first tower is far away from the substation, the generator car is used as the power supply device, and the grounding device at this time is the grounding device of the first tower; therefore, when the power supply device is a substation , you can first connect the down-leading insulated cable to the ground grid of the substation, and then connect the insulated cable to the positive pole of the three-phase rectifier device before the ice-melting work starts, and connect the ground grid to the negative pole of the three-phase rectifier device; when the power supply device is When generating a car, you can first connect the down-leading insulated cable to the grounding device of the first tower, and then connect the insulated cable to the positive pole of the three-phase rectifier before the ice-melting work starts. The grounding device of the first tower is connected to the three-phase rectifier Negative connection of the device.

Step s105: Control the power supply device to supply power to melt the ice with a single ground wire.

It can be understood that after all the above-mentioned preparatory work is completed, the operator controls the power supply device to supply power through the insulating platform or other remote control methods, and the ice melting work starts. Of course, there is no particular limitation on which method to choose to control the start of the ice-melting work, and the control methods that can achieve the purpose of the present invention are all within the protection scope of the present invention.

The method of melting ice for a single ground wire provided by the present invention is different from the previous method of using a super-large capacity power supply to melt the ice of the ground wire in the entire line. The ice-melting treatment of the ground wire significantly reduces the power supply capacity required for ice-melting and the power requirements of the three-phase rectifier circuit. The power consumption in the ice-melting process is less, and the workload involved in the ground wire transformation is small, economical and practical. The present invention does not need to carry out power outage processing on the power transmission line when the ice is melted, which brings great convenience to users' lives.

Embodiment two

Please refer to FIG. 2 . FIG. 2 is a flow chart of another method for melting ice with a single ground wire provided by the present invention. The method includes:

Step s201: Select the ground line of the target ice-melting section;

Optionally, the ground line of the target ice-melting section is the complete ice-covered section ground line;

It can be understood that this situation applies to the situation when the ground wire of the ice-covered section is short.

Optionally, the target ground line of the ice-melting section is a partial ground line of the ice-covered section in the ground line of the complete ice-covered section.

It can be understood that this situation is applicable when the ground wire of the ice-covered section is long and the capacity of the power supply device such as a generator car is insufficient. The complete ice-covered ground line can still be selected as the target ice-melting ground line. In which case the ground line of the target ice-melting section is specifically used, there is no special limitation here, and the selection methods of the target ice-melting ground line that can realize the purpose of the present invention are all within the protection scope of the present invention.

Step s202: Select the first tower and the second tower, wherein the ground line of the target ice-melting section is completely included between the first tower and the second tower;

It can be understood that, on the basis of the previous embodiment, this step also requires selecting the tower closest to the ground line of the target ice-melting section compared with other towers as the first tower. The nearest tower to the ice-melting ground line is used as the second tower. In addition, it is required that the finally obtained ground line of the target ice-melting section be completely included between the first tower and the second tower.

Step s203: Arrestors or insulators with gaps are arranged between the first tower and the second tower including the ground wire of the target ice-melting section between the first tower and the corresponding towers;

It is worth noting that the installation of lightning arresters or insulators with gaps between the ground wire of the target ice-melting section and the corresponding tower mentioned in this step is the specific application of the insulation transformation in this embodiment. In this embodiment, if the lightning arrester is selected, the operating voltage is required to be 5kV, and if the gap insulator is selected, the gap discharge voltage is required to be 4kV; of course, the specific value of the lightning arrester or the gap insulator is not specifically limited here, and it can realize Lightning arresters of different specifications or insulators with gaps for the purpose of the present invention are all within the scope of protection of the present invention.

Step s204: Extend the grounding body in the grounding device of the second tower by a preset length.

It can be understood that since the ice-covered section of the transmission line is often located in a mountainous area, the grounding resistance of the tower can reach 20 ohms or even higher. In order to reduce the grounding resistance, the grounding body in the grounding device of the second tower can be extended by a preset length. In the present invention, the preset length is set to 50 meters. Of course, the preset length is not limited to 50 meters. The specific value is determined by the actual situation, and there is no special limitation here. The preset lengths that can realize the purpose of the present invention are all in this article within the scope of protection of the invention.

It is worth noting that after the grounding body in the grounding device of the second tower has been extended to a preset length, the grounding resistance is still very large. The grounding body in the grounding device of the tower within the range is also extended to a preset length, and the grounding resistance of this tower is reduced. Therefore, due to the parallel connection of this tower and the second tower, the grounding resistance of the return electrode is further reduced, thereby making ice melting The work proceeded smoothly.

Step s205: Disconnect the ground wire on the first tower and lead it down with an insulated cable, and connect it to the positive pole of the three-phase rectification device connected to the power supply device, and connect the negative pole of the three-phase rectification device to the grounding device;

It can be understood that the three-phase rectifying device is connected with the power supply device, and is used for receiving the three-phase alternating current transmitted by the power supply device, rectifying the three-phase alternating current into direct current and delivering it to the ground wire of the target ice-melting section. The three-phase rectifier here can be a thyristor-type controllable ice-melting DC generator, and the thyristor-type controllable ice-melt DC generator includes many kinds, such as a full-bridge DC generator, a half-bridge DC generator, etc. The present invention is for There is no particular limitation on which thyristor-type controllable ice-melting DC generator or other three-phase rectification device to choose, and all three-phase rectification devices that can achieve the purpose of the present invention are within the protection scope of the present invention.

It is worth noting that the three-phase rectifier should be insulated from the ground, and the insulation strength should not be less than 5kV.

In addition, the required capacity of the power supply device during ice-melting work can be controlled between 200kW and 400kW through some modifications to the ground wire of the above-mentioned target ice-melting section. When the capacity of the power supply device is not large enough, control the three-phase rectifier to pass a current of about 80A to ensure that the ground wire of the target ice-melting section will not freeze; when the capacity of the power supply device is large enough, a current of about 120A can be selected for ice melting . Of course, there is no particular limitation on the specific value of the current used for ice-melting work, and the ice-melting current that can achieve the purpose of the present invention is within the protection scope of the present invention.

Step s206: Control the power supply device to supply power to melt the ice with a single ground wire.

The present invention provides a method for melting ice with a single ground wire. On the basis of the method for melting ice with a single ground wire provided in Embodiment 1, the grounding body in the grounding device of the second tower is extended to a preset length, reducing The grounding resistance is reduced, and the ice-melting efficiency of single-ground wire melting is improved. In addition, lightning arresters or belts are set between the first tower and the second tower, including the ground wire of the target ice-melting section between the first tower and the corresponding tower. The gap insulator provides the basis for the subsequent ice-melting work of the single ground wire, and also improves the safety of the ice-melting work of the single-ground wire. The role of safety lightning protection. In addition, the present invention also adopts the method of earth backflow, and only performs ice-melting treatment on the ground wire of the ice-covered section, which significantly reduces the power supply capacity required for ice-melting and the power requirement of the three-phase rectifier circuit, and the power consumption during the ice-melting process Less, the workload involved in the transformation of the ground wire is small, economical and practical. The present invention does not need to carry out power outage processing on the power transmission line when the ice is melted, which brings great convenience to users' lives.

Combined with the single-ground wire melting method provided in the above-mentioned embodiments, this specification also provides two schematic diagrams of the process of single-ground wire melting ice; Schematic diagram of the working process of the single ground wire melting ice, the working process is:

The substation 14 transmits the three-phase alternating current to the three-phase rectification device 15, and the three-phase rectification device 15 rectifies the three-phase alternating current into direct current and outputs the direct current from the positive pole, and then transmits the direct current to the ground wire 10 of the target ice-melting section through the insulated cable 13 to melt the ice. The negative pole of the three-phase rectifier 15 is connected to the ground grid 16 of the substation 14 . During this process, the ground wire 10 of the target ice-melting section and the first tower 11 are insulated through lightning arresters or gap insulators 17, and the same insulation transformation is carried out with other towers between the first tower 11 and the second tower 12. , the second tower 12 and the adjacent tower 19 that is not in the ground line 10 of the target ice-melting section are not insulated, and if necessary, the grounding device 182 of the second tower 12 and the grounding device 183 of the tower 19 can be The grounding body is extended to a preset length to reduce the grounding resistance.

Please refer to Fig. 4, Fig. 4 is a schematic diagram of the process of the single ground wire melting ice when the power supply device provided by the present invention is a power generation car, the working process is:

The generator car 24 transmits the three-phase alternating current to the three-phase rectifying device 25, and the three-phase rectifying device 25 rectifies the three-phase alternating current into direct current and outputs the direct current from the positive pole, and then transmits the direct current to the ground wire 20 of the target ice-melting section through the insulated cable 23 for ice melting , the negative pole of the three-phase rectifying device 25 is connected to the grounding device 261 of the first tower 21 . During this process, the ground wire 20 of the target ice-melting section and the first tower 21 are insulated through lightning arresters or gap insulators 27, and the same insulation transformation is carried out with other towers between the first tower 21 and the second tower 22. The second pole tower 22 and the pole tower 28 adjacent to it, which is not in the ground wire 20 of the target ice-melting section, are not insulated, and the grounding device 262 of the second pole tower 22 and the grounding device 263 of the pole tower 28 can be replaced if necessary. The grounding body is extended to a preset length to reduce the grounding resistance.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the related information, please refer to the description of the method part.

It should also be noted that in this specification, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations There is no such actual relationship or order between the operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. a single ground wire deicing method, is characterized in that, comprising:

Steps A: select target ice-melt section ground wire;

Step B: select the first shaft tower and the second shaft tower, wherein, described first shaft tower is strain tower, and described first shaft tower is nearest apart from the head end of described target ice-melt section ground wire compared with other strain rod towers, and described second shaft tower is nearest apart from the end of described target ice-melt section ground wire compared with other shaft towers;

Step C: insulating transformation is carried out to the target ice-melt section ground wire that described first shaft tower and described second shaft tower comprise between described first shaft tower;

Step D: disconnected by the ground wire on described first shaft tower and draw under adopting insulated cable, and the positive pole of the three phase rectifier device be connected with electric supply installation is connected, the negative pole of described three phase rectifier device is connected with earthing device;

Step e: control described electric supply installation and power, carry out single ground wire deicing.

2. de-icing method as claimed in claim 1, it is characterized in that, in steps A, described target ice-melt section ground wire is complete icing section ground wire.

3. de-icing method as claimed in claim 1, it is characterized in that, in steps A, described target ice-melt section ground wire is the part icing section ground wire in complete icing section ground wire.

4. de-icing method as claimed in claim 1, it is characterized in that, step B comprises:

Select described first shaft tower and described second shaft tower, described selection makes complete being included between described first shaft tower and described second shaft tower of described target ice-melt section ground wire.

5. de-icing method as claimed in claim 1, is characterized in that, also comprise between step B and step e:

Earth electrode in the earthing device of described second shaft tower is extended preset length.

6. de-icing method as claimed in claim 1, is characterized in that, described insulating transformation specifically comprises:

Between described target ice-melt section ground wire and shaft tower, lightning arrester or band gap insulator are set.

7. de-icing method as claimed in claim 1, it is characterized in that, described electric supply installation is transformer station.

8. de-icing method as claimed in claim 7, it is characterized in that, the described earthing device in step D is specially the earth mat of described transformer station.

9. de-icing method as claimed in claim 1, it is characterized in that, described electric supply installation is generator car.

10. de-icing method as claimed in claim 9, it is characterized in that, the described earthing device in step D is specially the earthing device of described first shaft tower.