CN111668791A - DC serial ice melting device and system - Google Patents
DC serial ice melting device and system Download PDFInfo
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- CN111668791A CN111668791A CN202010566948.9A CN202010566948A CN111668791A CN 111668791 A CN111668791 A CN 111668791A CN 202010566948 A CN202010566948 A CN 202010566948A CN 111668791 A CN111668791 A CN 111668791A
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- 238000002844 melting Methods 0.000 title claims abstract description 132
- 230000008018 melting Effects 0.000 title claims abstract description 132
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- 125000006850 spacer group Chemical group 0.000 claims description 6
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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Abstract
The invention relates to a direct-current series connection ice melting device and system. The device comprises a first power transmission line unit, a second power transmission line unit, a buried short circuit unit and a switch unit. The buried short circuit unit is used for connecting the spacing equipment of the intermediate transformer substation in parallel. The first power transmission line unit is connected between a direct current bus of the starting-end transformer substation and the buried short circuit unit, and the buried short circuit unit is connected with the switch unit through the second power transmission line unit. The buried short circuit unit is used for connecting corresponding lines between the first power transmission line unit and the second power transmission line unit according to the on-off state of the switch unit and short-circuits corresponding spacing equipment in the intermediate transformer substation. Based on the device, the direct-current ice melting equipment in the starting transformer substation provides ice melting direct current for a loop between a first power transmission line unit between the starting transformer substation and the intermediate transformer substation and a loop between a second power transmission line unit between the intermediate transformer substation and the tail-end transformer substation through the direct-current bus, ice melting equipment does not need to be distributed and configured for each adjacent transformer substation, and equipment cost is greatly reduced.
Description
Technical Field
The invention relates to the technical field of distribution line ice melting, in particular to a direct-current series connection ice melting device and system.
Background
With the development of national economy, the electricity consumption of society rises sharply, and the requirement of users on the reliability of electricity utilization is also continuously improved. The safe and stable operation of the main network line has profound significance for improving the power supply reliability and promoting the economic growth.
In recent years, due to the influence of extreme weather such as severe cold ice and snow, the safe and stable operation of a main network line is greatly threatened, and the hidden danger of line breakage, tower falling and even large-area power failure accidents exists for a long time, so that the transmission line is shut down in a large range and for a long time, and immeasurable loss is brought to national economy.
In the traditional technology, aiming at a power transmission line needing ice melting treatment among power transmission lines, direct current ice melting equipment (comprising a converter valve, a converter transformer, a valve cooling system and the like) is arranged in a power transmission line at a first end of the power transmission line, a short-circuit disconnecting link is arranged in a power transmission line at a second end of the line, the short-circuit disconnecting link is connected with the direct current ice melting equipment through a direct current bus in the power transmission line at the first end, a current loop is formed by the direct current ice melting equipment, the power transmission line to be melted and the short-circuit disconnecting link by changing a disconnecting link switching sequence, and direct current is output by the direct current ice melting equipment to perform direct.
However, in the current ice melting scheme for the power transmission line, corresponding direct current ice melting equipment needs to be configured to melt ice for the lines between adjacent power transformation stations, and the material cost is high, so that the method is not suitable for large-scale use.
Disclosure of Invention
Therefore, it is necessary to provide a dc cascade ice melting apparatus and system for solving the problem of high material cost.
A direct-current series connection ice melting device comprises a first power transmission line unit, a second power transmission line unit, at least one buried short circuit unit and a switch unit; the buried short circuit unit is used for connecting spacing equipment of the intermediate transformer substation in parallel; the switch unit is arranged at the tail-end transformer substation;
the first power transmission line unit is connected between a direct current bus of the starting-end transformer substation and the buried short-circuit unit, and the buried short-circuit unit is connected with the switch unit through the second power transmission line unit;
the buried short circuit unit is used for connecting corresponding lines between the first power transmission line unit and the second power transmission line unit according to the on-off state of the switch unit and short-circuits corresponding spacing equipment in the intermediate transformer substation.
In one embodiment, the first power line unit includes a first power line and a fourth power line; the second power line unit includes a second power line and a third power line;
the buried short circuit unit comprises a first buried short circuit wire and a second buried short circuit wire, the first buried short circuit wire is used for being connected with first spacing equipment of the intermediate transformer substation in parallel, and the second buried short circuit wire is used for being connected with second spacing equipment of the intermediate transformer substation in parallel; the switch unit includes a first switch;
first power transmission line one end is used for connecting the first direct current bus of top transformer substation, the one end of first buried short circuit line is connected to the other end of first power transmission line, the one end of second power transmission line is connected to the other end of first buried short circuit line, the one end of first switch is connected to the other end of second power transmission line, the one end of third power transmission line is connected to the other end of first switch, the one end of second buried short circuit line is connected to the other end of third power transmission line, the other end of second buried short circuit line is used for connecting the second direct current bus of top transformer substation through the fourth power transmission line.
In one embodiment, the first power line unit further comprises a fifth power line, the second power line unit further comprises a sixth power line, the buried short circuit unit further comprises a third buried short circuit, and the switch unit further comprises a second switch; the third buried short-circuit wire is used for connecting third interval equipment of the intermediate transformer substation in parallel;
one end of a fifth transmission line is used for being connected with a third direct current bus of a starting-end transformer substation, the other end of the fifth transmission line is connected with one end of a third buried short-circuit wire, the other end of the third buried short-circuit wire is connected with one end of a sixth transmission line, the other end of the sixth transmission line is connected with one end of a second switch, and the other end of the second switch is respectively connected with the other end of the first switch and one end of the third transmission line.
In one embodiment, the dc series ice melting apparatus further includes a first connecting member, a second connecting member, a third connecting member, and a fourth connecting member;
one end of the first buried short-circuit wire is detachably connected with one end of the first spacing device through a first connecting piece, and the other end of the first buried short-circuit wire is detachably connected with the other end of the first spacing device through a second connecting piece; one end of the second buried short-circuit wire is detachably connected with one end of the second spacing device through a third connecting piece, and the other end of the second buried short-circuit wire is detachably connected with the other end of the second spacing device through a fourth connecting piece.
In one embodiment, the switch unit comprises at least one knife switch.
In one embodiment, the first buried shorting stub and the second buried shorting stub are dc 10kV cables.
A DC series connection ice melting system comprises a DC ice melting device arranged at a starting-end transformer substation and the DC series connection ice melting device;
the direct-current ice melting equipment comprises a direct-current power supply output device and a switch device; the output end of the direct current power supply output device is respectively connected with the corresponding direct current bus in the initial transformer substation through the switch device.
In one embodiment, the dc-ice melting device further comprises a first isolating switch and a second isolating switch;
the first disconnecting switch is connected between a first direct current bus of the starting transformer substation and the first power transmission line unit, and the second disconnecting switch is connected between a second direct current bus of the starting transformer substation and the first power transmission line unit.
In one embodiment, the first isolation switch and the second isolation switch are isolation knife switches.
In one embodiment, the switching device is a series-parallel knife switch group.
The direct current series connection ice melting device comprises a first power transmission line unit, a second power transmission line unit, at least one buried short circuit unit and a switch unit. The buried short circuit unit is used for connecting spacing equipment of an intermediate transformer substation in parallel, the switch unit is arranged at a terminal transformer substation, the first power transmission line unit is connected between a direct current bus of the starting transformer substation and the buried short circuit unit, and the buried short circuit unit is connected with the switch unit through the second power transmission line unit. Based on the direct-current series connection ice melting device, direct-current ice melting equipment in the initial-end substation provides ice melting direct current for a first power transmission line unit between the initial-end substation and the middle substation and a second power transmission line unit between the middle substation and the tail-end substation through the direct-current bus, a direct-current loop can be formed without passing through spacing equipment of the middle substation, direct-current ice melting equipment does not need to be configured independently for each adjacent substation, the utilization rate of the direct-current ice melting equipment is improved, the equipment investment cost is greatly reduced, the ice melting loop needing to be communicated can be switched through the switch unit, and the equipment is convenient to operate.
Drawings
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular description of preferred embodiments of the application, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual dimensions, emphasis instead being placed upon illustrating the subject matter of the present application.
FIG. 1 is a schematic diagram of a first structure of a DC cascade ice melting apparatus according to an embodiment;
FIG. 2 is a second schematic diagram of an embodiment of a DC cascade ice melting apparatus;
FIG. 3 is a schematic diagram of a third structure of the DC cascade ice melting apparatus in one embodiment;
FIG. 4 is a schematic diagram of a first structure of the DC cascade ice melting system in one embodiment;
FIG. 5 is a second structural diagram of the DC cascade ice melting system in one embodiment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
At present, the ice melting scheme for the transmission line of the transformer substation mainly comprises two schemes: according to the first scheme, direct-current ice melting equipment is arranged at a substation at one end of a power transmission line needing ice melting between adjacent substations, an ice melting short-circuit disconnecting link is additionally arranged at the other end of the power transmission line, ice melting current is provided for a loop through the ice melting equipment, the ice melting short-circuit disconnecting link switches a closing sequence to switch different current loops, and ice is directly melted on a closed line between the two substations. In the first scheme, direct-current ice melting equipment needs to be respectively configured for lines to be melted between adjacent substations, so that the material cost is high and the method is not suitable for large-scale use. According to the second scheme, through an artificial line crossing mode, the direct-current ice melting equipment and the connecting line of the transformer substation A are used for communicating the upper-layer line crossing of the transformer substation B iron tower connected with the line, the ice melting short-circuit disconnecting link of the transformer substation C connected with the line is closed, and the direct-current ice melting equipment of the transformer substation A supplies ice melting current to a closed loop to be melted among the transformer substation A, the transformer substation B and the transformer substation C, so that the line is connected in series for ice melting. In the second scheme, the upper layer overline is more than twenty meters high, and an overhead working truck is required to be communicated with the upper layer overline before serial connection ice melting is carried out each time; after ice melting is finished, jumper wires need to be removed, power supply is recovered, operation is complex, and power failure time and workload of operation and inspection personnel in a transformer substation are increased. And if the power failure fault occurs under the second scheme communication mode, the power failure time delay is longer, and the power supply stability is poorer. Therefore, the direct current series connection ice melting equipment capable of saving material cost and convenient to operate is provided.
A direct current series connection ice melting device is shown in figure 1 and comprises a first power transmission line unit, a second power transmission line unit, at least one buried short circuit unit and a switch unit; the buried short circuit unit is used for connecting spacing equipment of the intermediate transformer substation in parallel; the switch unit is arranged at the tail-end transformer substation;
the first power transmission line unit is connected between a direct current bus of the starting-end transformer substation and the buried short-circuit unit, and the buried short-circuit unit is connected with the switch unit through the second power transmission line unit;
the buried short circuit unit is used for connecting corresponding lines between the first power transmission line unit and the second power transmission line unit according to the on-off state of the switch unit and short-circuits corresponding spacing equipment in the intermediate transformer substation.
Specifically, the first power transmission line unit is a line unit to be melted ice between the starting-end substation and the intermediate substation, and can be used for connecting a three-phase direct-current bus, a two-phase direct-current bus and the like of the starting-end substation. It should be understood that the first power transmission line unit is connected with the dc bus of the starting substation so as to communicate with the circuit to be de-iced, and the number of the dc bus of the starting substation or the positive and negative polarities are not limited. And the output ends of the direct-current ice melting equipment in the substation at the initial end are respectively connected with the corresponding direct-current buses and are used for providing direct-current ice melting current for a to-be-melted circuit communicated between the substations so as to meet the ice melting requirements of power transmission lines of different grades.
The second power transmission line unit is a line unit to be de-iced between the middle transformer substation and the tail end transformer substation and can be used for being connected with a switch unit in the tail end transformer substation. It should be noted that the second power line unit may be a two-phase or three-phase power line unit corresponding to the first power line unit. For example, when a first power line unit is connected to a three-phase dc bus of a starting substation, the corresponding second power line unit is a three-wire power line unit connected between an intermediate substation and a terminal substation. Illustratively, the first and second power line units are overhead power line units.
And the switch unit is arranged at the tail end transformer substation and is used for communicating the corresponding to-be-melted ice loop through switching of the switch state of the switch unit. The switching unit may include one or more combined switching devices. In one embodiment, the switch unit comprises at least one knife switch.
Buried short circuit unit buries ground shorting stub including the multistage, can be used to connect the circuit between first power transmission line unit and the second power transmission line unit, can also be used to connect the circuit between each adjacent middle transformer substation. The buried short circuit unit can be laid in a cable trench corresponding to the intermediate transformer substation and is used for short-circuiting the interval equipment of the intermediate transformer substation, so that the communicated ice melting loop does not need to pass through equipment in the intermediate transformer substation, and the damage to the alternating current equipment in the intermediate transformer substation in the aspects of insulation, magnetization and the like is avoided. And moreover, the short circuit position of the buried short circuit wire and the spacing equipment in the intermediate transformer substation is close to the ground, so that an operator can adjust the connection state of the buried short circuit wire without the help of a high-altitude operation tool. For example, when ice melting processing is not required to be performed on the power transmission line, the connection between the buried short-circuit unit and the spacer equipment of the intermediate substation is disconnected, so that the spacer equipment is normally connected to the circuit to work. Illustratively, the direct-current series connection ice melting device can comprise a first buried short circuit unit and a second buried short circuit unit, wherein the first buried short circuit unit is used for being connected with the spacing equipment of a first intermediate transformer substation in parallel, and the second buried short circuit unit is used for being connected with the spacing equipment of a second intermediate transformer substation in parallel. The direct-current ice melting equipment of the starting-end transformer substation can supply power to the first power transmission line unit, the first buried short-circuit line, the second buried short-circuit line and the ice melting unit to be communicated among the second power transmission line units through the direct-current bus of the starting-end transformer substation, and therefore ice melting power supplies can be provided for the starting-end transformer substation, the first intermediate transformer substation, the second intermediate transformer substation and power transmission circuits among the second intermediate transformer substation and the terminal transformer substation, and the utilization rate of the direct-current ice melting equipment is increased.
Specifically, the buried short circuit unit is used for connecting corresponding lines between the first power transmission line unit and the second power transmission line unit according to the on-off state of the switch unit and simultaneously short-circuits medium/high voltage interval equipment in adjacent substations. When ice melting treatment needs to be carried out on a certain transmission circuit between the starting-end substation and the tail-end substation, a line to be melted between the starting-end substation and the tail-end substation is connected through the buried short-circuit unit, the line to be melted is communicated by changing a closing sequence of a switch unit in the tail-end substation, and then ice melting operation is carried out on the communicated line through direct-current ice melting equipment in the starting-end substation.
In the embodiment of the application, the direct-current series connection ice melting equipment is provided, a to-be-melted ice loop is switched through the opening and closing state of the switch unit, and ice melting direct current is provided for a to-be-melted ice circuit communicated between the first power transmission line unit and the second power transmission line unit through the direct-current bus by the direct-current ice melting equipment in the starting transformer substation, so that the direct-current loop can be formed without passing through the interval equipment of the middle transformer substation. Through the equipment, direct-current ice melting equipment does not need to be configured independently for each adjacent transformer substation, the utilization rate of the direct-current ice melting equipment is improved, the equipment investment cost is greatly reduced, and the equipment is convenient to operate. And the connection position of the buried short-circuit connection unit and the spacing equipment in the adjacent intermediate transformer substation is low, so that an operator can conveniently bypass the spacing equipment of the corresponding intermediate transformer substation when the ice melting of the line to be melted needs to be carried out.
In one embodiment, as shown in fig. 2, the first power line unit includes a first power line and a fourth power line; the second power line unit includes a second power line and a third power line;
the buried short circuit unit comprises a first buried short circuit wire and a second buried short circuit wire, the first buried short circuit wire is used for being connected with first spacing equipment of the intermediate transformer substation in parallel, and the second buried short circuit wire is used for being connected with second spacing equipment of the intermediate transformer substation in parallel; the switch unit includes a first switch;
first power transmission line one end is used for connecting the first direct current bus of top transformer substation, the one end of first buried short circuit line is connected to the other end of first power transmission line, the one end of second power transmission line is connected to the other end of first buried short circuit line, the one end of first switch is connected to the other end of second power transmission line, the one end of third power transmission line is connected to the other end of first switch, the one end of second buried short circuit line is connected to the other end of third power transmission line, the other end of second buried short circuit line is used for connecting the second direct current bus of top transformer substation through the fourth power transmission line.
Specifically, the first power transmission line unit comprises a first power transmission line and a fourth power transmission line, and the first power transmission line unit can be connected with a power output end of the direct-current ice melting device through a two-phase direct-current bus of a starting-end substation. Illustratively, the first direct-current bus is connected with the anode of the direct-current ice melting device, and the second direct-current bus is connected with the cathode of the direct-current ice melting device; or the first direct current bus is connected with the negative electrode of the direct current ice melting equipment, and the second direct current bus is connected with the positive electrode of the direct current ice melting equipment.
The second power line unit includes a second power line and a third power line with a first switch connected therebetween. The first switch can be a thyristor, a knife switch, or other switching elements. In one embodiment, the first buried shorting stub and the second buried shorting stub are dc 10kV cables.
The buried short circuit unit is connected between the first power transmission line unit and the second power transmission line unit and comprises a first buried short circuit wire and a second buried short circuit wire. The first buried short circuit wire is used for short-circuiting first spacing equipment of the intermediate transformer substation. And the second buried short-circuit wire is used for short-circuiting the second spacing equipment of the intermediate transformer substation. It can be understood that the first spacer device and the second spacer device may be ac medium-voltage and high-voltage devices in the intermediate substation, may be a single device, and may also be an ac device group, and are not specifically limited herein.
Specifically, when ice melting treatment needs to be performed on a two-phase loop between a starting transformer substation and a terminal transformer substation, a first switch in the terminal transformer substation is closed, so that direct current ice melting is performed on a path formed by two-phase power transmission lines between the starting transformer substation and an intermediate transformer substation and a path formed by two-phase power transmission lines between the intermediate transformer substation and the terminal transformer substation through a direct current bus, corresponding direct current ice melting equipment does not need to be configured for each adjacent transformer substation, equipment materials are greatly reduced, and the operation is convenient.
In one embodiment, as shown in fig. 3, the first power line unit further comprises a fifth power line, the second power line unit further comprises a sixth power line, the buried short circuit unit further comprises a third buried short circuit, and the switching unit further comprises a second switch; the third buried short-circuit wire is used for connecting third interval equipment of the intermediate transformer substation in parallel;
one end of a fifth transmission line is used for being connected with a third direct current bus of a starting-end transformer substation, the other end of the fifth transmission line is connected with one end of a third buried short-circuit wire, the other end of the third buried short-circuit wire is connected with one end of a sixth transmission line, the other end of the sixth transmission line is connected with one end of a second switch, and the other end of the second switch is respectively connected with the other end of the first switch and one end of the third transmission line.
In particular, the first power line unit further comprises a fifth power line, the first power line unit comprising a power line for connecting between a three-phase direct current bus of a starting substation and an intermediate substation. The second power line unit further comprises a sixth power line, the second power line unit comprising a three-phase line connected between the intermediate substation and the end substation.
The buried shorting stub unit comprises a third buried shorting stub for connecting third distance devices of the intermediate substation in parallel. Each buried short-circuit wire is laid in a cable trench beside the corresponding spacing device. When the transformer substation normally operates without ice melting, the buried short-circuit terminal is not connected with adjacent spacing equipment, and the normal operation of the equipment is not affected. When ice needs to be melted, the spacing equipment is connected with the corresponding buried short-circuit terminal, and the spacing equipment is bypassed, so that ice melting current flows through the cable without passing through the equipment. Because the short-circuit terminal and the equipment connecting line are both in a low position, the connecting line can be prefabricated, and the short-circuit terminal and the equipment connecting line are directly connected when ice melting is needed every time, so that the operation is convenient. And each buried short-circuit wire is laid in the cable trench, so that the buried short-circuit wire is safe and attractive, and the overhaul and inspection of operators under normal conditions are not influenced.
The switch unit further comprises a second switch connected between the third power transmission line and the sixth power transmission line, and the second switch can be switched to the line to be de-iced by controlling the opening and closing states of the switches in the switch unit. Illustratively, when the ice melting needs to be carried out on the power transmission line between the second direct current bus and the third direct current bus, the first switch is opened and the second switch is closed, so that direct current ice melting current is provided for a fourth power transmission line, a second buried short-circuit wire, a third power transmission line, a sixth power transmission line, a third buried short-circuit wire, a fifth power transmission line and a power transmission loop between the third direct current buses through direct current ice melting equipment in the starting-end transformer substation through the second direct current bus, no additional direct current ice melting equipment needs to be additionally arranged, and the material cost is reduced.
In one embodiment, the dc series ice melting apparatus further includes a first connecting member, a second connecting member, a third connecting member, and a fourth connecting member;
one end of the first buried short-circuit wire is detachably connected with one end of the first spacing device through a first connecting piece, and the other end of the first buried short-circuit wire is detachably connected with the other end of the first spacing device through a second connecting piece; one end of the second buried short-circuit wire is detachably connected with one end of the second spacing device through a third connecting piece, and the other end of the second buried short-circuit wire is detachably connected with the other end of the second spacing device through a fourth connecting piece.
Particularly, the two ends of the first buried short-circuit wire are detachably connected in parallel with first spacing equipment in the intermediate transformer substation through the first connecting piece and the second connecting piece respectively, the two ends of the second buried short-circuit wire are detachably connected in parallel with second spacing equipment through the third connecting piece and the fourth connecting piece respectively, and the underground short-circuit wire is simple in structure and single-sided in operation. The first connecting piece, the second connecting piece, the third connecting piece and the fourth connecting piece can be metal wire clamps or metal clamping blocks and the like, and the detachable connection with corresponding spacing equipment is realized through the connecting pieces. Therefore, when ice needs to be melted, each buried short-circuit wire is connected with the corresponding spacing device in parallel through the connecting piece, the spacing device is bypassed, and ice melting current flows through the buried short-circuit wire without passing through the alternating current device. After the line to be de-iced is de-iced, an operator can remove redundant buried short wires to enable the alternating current equipment in the gap to be normally connected into the circuit to work.
In one embodiment, the dc cascade ice melting apparatus further comprises a fifth connection member and a sixth connection member. The first power line unit further comprises a fifth power line, the second power line unit further comprises a sixth power line, the buried short circuit unit further comprises a third buried short circuit wire, and the switch unit further comprises a second switch; the third buried short-circuit wire is used for connecting third interval equipment of the intermediate transformer substation in parallel;
one end of a fifth transmission line is used for being connected with a third direct current bus of a starting-end transformer substation, the other end of the fifth transmission line is connected with one end of a third buried short-circuit wire, the other end of the third buried short-circuit wire is connected with one end of a sixth transmission line, the other end of the sixth transmission line is connected with one end of a second switch, and the other end of the second switch is respectively connected with the other end of the first switch and one end of the third transmission line.
One end of the third buried short-circuit wire is detachably connected with one end of the third spacing device through the fifth connecting piece, and the other end of the third buried short-circuit wire is detachably connected with the other end of the third spacing device through the sixth connecting piece. Illustratively, the fifth connector and the sixth connector are metal sliders, clips, metal wire clamps and/or the like.
A DC series connection ice melting system is shown in FIG. 4, and comprises a DC ice melting device arranged at a starting transformer substation and the DC series connection ice melting device;
the direct-current ice melting equipment comprises a direct-current power supply output device and a switch device; the output end of the direct current power supply output device is respectively connected with the corresponding direct current bus in the initial transformer substation through the switch device.
Specifically, the direct-current ice melting equipment provides a stable direct-current ice melting power supply for a to-be-melted loop communicated between the starting transformer substation and the tail transformer substation through a direct-current bus of the starting transformer substation. The direct-current deicing equipment comprises a direct-current power supply output device and a switch device. The direct-current power supply output device is used for outputting stable direct current so as to perform direct-current ice melting on a line to be melted of the transformer substation. The output power supply of the direct-current power supply output device is connected with a two-phase or three-phase direct-current bus of the starting-end transformer substation through a switch device. The switching device can comprise a plurality of series-parallel hybrid-connected switching devices and is used for adjusting the connection relation between the direct-current bus and the positive and negative terminals of the direct-current ice melting equipment. For example, when the dc power output device is connected to the three-phase dc bus of the substation through the switching device, the bus segment of the corresponding phase line in the three-phase dc bus can be swiftly and intelligently connected between the positive and negative output terminals of the dc power output device by controlling the state of each switching device in the switching device. In one embodiment, the switching device is a series-parallel knife switch set. Illustratively, the series-parallel disconnecting link group comprises three groups of conducting branches connected in parallel at positive and negative electrode output ends of the direct-current power supply output device and used for forming line loops with different polarities.
The direct-current series connection ice melting device comprises a first power transmission line unit, a second power transmission line unit, at least one buried short circuit unit and a switch unit; the buried short circuit unit is used for connecting spacing equipment of the intermediate transformer substation in parallel; the switch unit is arranged at the tail-end transformer substation; the first power transmission line unit is connected between a direct current bus of the starting-end transformer substation and the buried short-circuit unit, and the buried short-circuit unit is connected with the switch unit through the second power transmission line unit; the buried short circuit unit is used for connecting corresponding lines between the first power transmission line unit and the second power transmission line unit according to the on-off state of the switch unit and short-circuits corresponding spacing equipment in the intermediate transformer substation.
Specifically, the first power transmission line unit is a line unit to be de-iced between the starting-end substation and the intermediate substation, and can be used for connecting a three-phase direct-current bus or a two-phase direct-current bus of the starting-end substation. And the output ends of the direct-current ice melting equipment in the substation at the initial end are respectively connected with the corresponding direct-current buses and are used for providing direct-current ice melting current for a to-be-melted circuit communicated between the substations so as to meet the ice melting requirements of power transmission lines of different grades.
The second power transmission line unit is a line unit to be de-iced between the middle transformer substation and the tail end transformer substation and can be used for being connected with a switch unit in the tail end transformer substation. It should be noted that the second power line unit may be a two-phase or three-phase power line unit corresponding to the first power line unit. For example, when a first power line unit is connected to a three-phase dc bus of a starting substation, the corresponding second power line unit is a three-wire power line unit connected between an intermediate substation and a terminal substation.
And the switch unit is arranged at the tail end transformer substation and is used for communicating the corresponding to-be-melted ice loop through switching of the switch state of the switch unit. The switching unit may include one or more combined switching devices.
Buried short circuit unit buries ground shorting stub including the multistage, can be used to connect the circuit between first power transmission line unit and the second power transmission line unit, can also be used to connect the circuit between each adjacent middle transformer substation. The buried short circuit unit can be laid in a cable trench corresponding to the intermediate transformer substation and is used for short-circuiting the interval equipment of the intermediate transformer substation, so that the communicated ice melting loop does not need to pass through equipment in the intermediate transformer substation, and the damage to the alternating current equipment in the intermediate transformer substation in the aspects of insulation, magnetization and the like is avoided. And moreover, the short circuit position of the buried short circuit wire and the spacing equipment in the intermediate transformer substation is close to the ground, so that an operator can adjust the connection state of the buried short circuit wire without the help of a high-altitude operation tool. Illustratively, the direct-current series connection ice melting device can comprise a first buried short circuit unit and a second buried short circuit unit, wherein the first buried short circuit unit is used for being connected with the spacing equipment of a first intermediate transformer substation in parallel, and the second buried short circuit unit is used for being connected with the spacing equipment of a second intermediate transformer substation in parallel. The direct-current ice melting equipment of the starting-end transformer substation can supply power to the first power transmission line unit, the first buried short-circuit line, the second buried short-circuit line and the ice melting unit to be communicated among the second power transmission line units through the direct-current bus of the starting-end transformer substation, and therefore ice melting power supplies can be provided for the starting-end transformer substation, the first intermediate transformer substation, the second intermediate transformer substation and power transmission circuits among the second intermediate transformer substation and the terminal transformer substation, and the utilization rate of the direct-current ice melting equipment is increased.
When ice melting treatment needs to be carried out on a certain transmission circuit between a starting-end transformer substation and a tail-end transformer substation, the line to be melted is communicated by changing a switching-on sequence of a switch unit in the tail-end transformer substation, a direct-current power supply output device is connected with a direct-current bus of the starting-end transformer substation through the switch unit, direct-current ice melting is carried out on the line to be melted communicated between the starting-end transformer substation and the tail-end transformer substation, direct-current ice melting equipment corresponding to equipment between adjacent transformer substations is not needed, material cost in an ice melting system is greatly reduced, the ice melting system is suitable for large-scale popularization and application.
In one embodiment, as shown in fig. 5, the dc-ice melting device further includes a first isolation switch and a second isolation switch;
the first disconnecting switch is connected between a first direct current bus of the starting transformer substation and the first power transmission line unit, and the second disconnecting switch is connected between a second direct current bus of the starting transformer substation and the first power transmission line unit.
Specifically, the direct-current ice melting device further comprises a first isolating switch connected between the first direct-current bus and the first power line unit, and a second isolating switch connected between the second direct-current bus and the first power line unit. That is, the first disconnector is connected between the first dc bus and the first power line, and the second disconnector is connected between the second dc bus and the fourth power line. Therefore, the to-be-melted ice loop between the starting-end substation and the terminal substation is communicated by controlling the on-off states of the first isolating switch, the second isolating switch and the switch unit. In one embodiment, the first isolation switch and the second isolation switch are both isolation switches.
In one embodiment, the dc-ice melting device further comprises a third isolating switch; the third disconnector is connected between a third dc bus of the starting substation and the first transmission line unit.
In the direct-current series connection ice melting device, the first power transmission line unit further comprises a fifth power transmission line, the second power transmission line unit further comprises a sixth power transmission line, the buried short circuit unit further comprises a third buried short circuit line, and the switch unit further comprises a second switch; the third buried short-circuit wire is used for connecting third interval equipment of the intermediate transformer substation in parallel;
one end of a fifth transmission line is used for being connected with a third direct current bus of a starting-end transformer substation, the other end of the fifth transmission line is connected with one end of a third buried short-circuit wire, the other end of the third buried short-circuit wire is connected with one end of a sixth transmission line, the other end of the sixth transmission line is connected with one end of a second switch, and the other end of the second switch is respectively connected with the other end of the first switch and one end of the third transmission line.
Specifically, in the direct-current series connection ice melting system, the isolating switches between the three-phase direct-current bus and the first power transmission line unit are controlled to be matched with the switch units in the direct-current series connection ice melting device, so that the power transmission lines to be melted in the system are communicated, and the switching mode is flexible and reliable.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A direct-current series connection ice melting device is characterized by comprising a first power transmission line unit, a second power transmission line unit, at least one buried short circuit unit and a switch unit; the buried short circuit unit is used for connecting spacing equipment of an intermediate transformer substation in parallel; the switch unit is arranged in the tail-end transformer substation;
the first power transmission line unit is connected between a direct current bus of a starting-end transformer substation and the buried short circuit unit, and the buried short circuit unit is connected with the switch unit through the second power transmission line unit;
the buried short circuit unit is used for connecting corresponding lines between the first power transmission line unit and the second power transmission line unit according to the on-off state of the switch unit and short-circuits corresponding spacing equipment in the intermediate transformer substation.
2. The dc series ice melting apparatus of claim 1, wherein the first power line unit comprises a first power line and a fourth power line; the second power line unit includes a second power line and a third power line;
the buried short circuit unit comprises a first buried short circuit wire and a second buried short circuit wire, the first buried short circuit wire is used for being connected with first spacing equipment of the intermediate transformer substation in parallel, and the second buried short circuit wire is used for being connected with second spacing equipment of the intermediate transformer substation in parallel; the switch unit includes a first switch;
one end of the first power transmission line is used for being connected with a first direct current bus of the starting-end transformer substation, the other end of the first power transmission line is connected with one end of the first buried short circuit line, the other end of the first buried short circuit line is connected with one end of the second power transmission line, the other end of the second power transmission line is connected with one end of the first switch, the other end of the first switch is connected with one end of the third power transmission line, the other end of the third power transmission line is connected with one end of the second buried short circuit line, and the other end of the second buried short circuit line is used for being connected with a second direct current bus of the starting-end transformer substation through the fourth power transmission line.
3. The dc series ice melting apparatus of claim 2, wherein the first power line unit further comprises a fifth power line, the second power line unit further comprises a sixth power line, the buried short circuit unit further comprises a third buried short circuit, and the switching unit further comprises a second switch; the third buried short-circuit line is used for connecting third spacing equipment of the intermediate transformer substation in parallel;
one end of the fifth power transmission line is used for being connected with a third direct current bus of the starting-end transformer substation, the other end of the fifth power transmission line is connected with one end of a third buried short-circuit wire, the other end of the third buried short-circuit wire is connected with one end of a sixth power transmission line, the other end of the sixth power transmission line is connected with one end of a second switch, and the other end of the second switch is respectively connected with the other end of the first switch and one end of the third power transmission line.
4. The dc series ice melting apparatus according to claim 2, further comprising a first connecting member, a second connecting member, a third connecting member, and a fourth connecting member;
one end of the first buried short-circuit wire is detachably connected with one end of the first spacing device through the first connecting piece, and the other end of the first buried short-circuit wire is detachably connected with the other end of the first spacing device through the second connecting piece; one end of the second buried short-circuit wire is used for being detachably connected with one end of the second spacer device through the third connecting piece, and the other end of the second buried short-circuit wire is used for being detachably connected with the other end of the second spacer device through the fourth connecting piece.
5. The DC cascade ice melting apparatus according to any one of claims 1 to 4, wherein the switch unit comprises at least one knife switch.
6. The dc cascade ice melting apparatus of any one of claims 2 to 4, wherein the first buried shorting stub and the second buried shorting stub are dc 10kV cables.
7. A DC series connection ice melting system is characterized by comprising a DC ice melting device arranged at a starting transformer substation and the DC series connection ice melting device of any one of claims 1 to 6;
the direct-current ice melting equipment comprises a direct-current power supply output device and a switch device; and the output end of the direct-current power supply output device is respectively connected with corresponding direct-current buses in the initial-end transformer substation through the switch device.
8. The dc cascade ice melting system of claim 7, wherein the dc ice melting device further comprises a first isolation switch and a second isolation switch;
the first disconnector is connected between a first direct current bus of the starting substation and the first power line unit, and the second disconnector is connected between a second direct current bus of the starting substation and the first power line unit.
9. The dc series ice melting system of claim 8, wherein the first and second isolation switches are isolation switches.
10. The dc series ice melting system according to any one of claims 7 to 9, wherein the switching device is a series-parallel knife switch set.
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| CN106207925A (en) * | 2016-07-25 | 2016-12-07 | 国网湖南省电力公司 | A kind of distribution network line ice melting system and de-icing method thereof |
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| US4119866A (en) * | 1977-02-14 | 1978-10-10 | Georgy Andreevich Genrikh | High voltage electrical network with DC ice-melting device and current return through ground |
| CN101820140A (en) * | 2010-03-30 | 2010-09-01 | 南方电网技术研究中心 | Method for accessing DC ice melting device at substation |
| CN202749782U (en) * | 2012-05-28 | 2013-02-20 | 南方电网科学研究院有限责任公司 | Transmission line ice melting system implemented by switching operation in whole process |
| CN203367934U (en) * | 2013-07-31 | 2013-12-25 | 胡击铀 | DC deicing system |
| CN106207925A (en) * | 2016-07-25 | 2016-12-07 | 国网湖南省电力公司 | A kind of distribution network line ice melting system and de-icing method thereof |
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