CN110854738A - Segmented ice melting method for high-voltage transmission line - Google Patents
Segmented ice melting method for high-voltage transmission line Download PDFInfo
- Publication number
- CN110854738A CN110854738A CN201911202362.8A CN201911202362A CN110854738A CN 110854738 A CN110854738 A CN 110854738A CN 201911202362 A CN201911202362 A CN 201911202362A CN 110854738 A CN110854738 A CN 110854738A
- Authority
- CN
- China
- Prior art keywords
- ice melting
- ice
- line
- melting
- direct
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
Landscapes
- Suspension Of Electric Lines Or Cables (AREA)
Abstract
The invention discloses a segmented ice melting method of a high-voltage transmission line, which comprises the steps of determining an ice melting area; powering off the line of the ice melting section; arranging an ice melting short-circuit point and a short-circuit at one end of the ice melting area, and arranging a direct-current ice melting device at the other end of the ice melting area; connecting the input end of the direct-current ice melting device with a low-voltage transmission line, and connecting the output end of the direct-current ice melting device with the other end of the ice melting area through an ice melting cable; starting the direct-current ice melting device to realize segmented ice melting of the high-voltage transmission line; and (4) after the ice melting is finished, detaching the short-circuit line, the ice melting cable and the direct-current ice melting device, and finishing the ice melting. The invention can realize the targeted ice melting of the repeated ice sections in the transmission line, is easy to implement, and the ice melting device is deployed at a certain position in the middle of the line, and does not need to be deployed at a transformer substation, thereby being particularly suitable for implementing emergency ice melting of the line which can not be deployed at the station end due to site reasons.
Description
Technical Field
The invention belongs to the technical field of electrical engineering, and particularly relates to a segmented ice melting method for a high-voltage transmission line.
Background
With the development of economic technology and the improvement of living standard of people, electric energy becomes essential secondary energy in production and life of people, and brings endless convenience to production and life of people. Therefore, ensuring stable operation of the power system becomes one of the most important tasks of the power system.
However, ice and snow disasters frequently occur in China, ice coating is very easy to occur particularly in micro-terrain areas such as mountainous areas and lakes, line breakage and pole falling are easily caused after ice coating of a power transmission line, and the safe operation and power supply reliability of a power grid are seriously threatened. Therefore, various types of ice melting devices are developed at home and abroad, and the ice coating line is heated by applying larger current to the ice coating line so as to melt the ice coating, so that the accident of tower falling and line breaking is prevented.
At present, when the ice melting device is used for melting ice on a main network transmission line, a full-line ice melting mode is generally adopted: namely, when the ice coating of a certain section in the line reaches a certain degree, the ice is melted in the whole line flow regardless of the length of the ice coating section. Because the main network transmission line has long distance and thick line diameter, the power supply and the ice melting device have large capacity, difficult construction and high cost when melting ice on the whole line, and the popularization and the application of the ice melting technology are seriously restricted. On the other hand, most of the ice melting capacity is usually consumed on the ice-coating-free line segment on the current loop in the full-line ice melting mode, so that the ice melting capacity is wasted. An intuitive alternative is to short circuit somewhere in the middle of the line, and as long as the ice-covered section is between the deployed substation and the short-circuit point, the ice melting device can be used to implement through-current ice melting on the line between the deployed substation and the short-circuit point, thereby reducing the ice melting capacity. However, the through-flow section in this manner includes not only the ice-covered line section, but also the area from the distribution substation to the ice-covered line section, and when the ice-covered section is far from the substation, a large ice-melting capacity and a large ice-melting device capacity are still required; moreover, as with the full-line ice melting, an ice melting device also needs to be deployed at a substation at one end of the ice-covered line. For some transformer substations, the ice melting device cannot be arranged due to the limitation of transformer substation sites and other conditions, and the ice melting mode is not applicable any more.
Patent CN201711463777.1 discloses a sectional ice melting scheme in which an ice melting device is deployed in a middle section of a line and an ice melting power supply is provided by multiplexing an ice-free section line, which solves the difficult problem of power supply to the ice melting device when the ice melting is performed on a main line section, and can perform targeted dc ice melting on an ice-covered section. However, this method requires modification of the transformer substation and the middle of the transmission line on one side, and it is sometimes very difficult to implement some transformer substations and transmission lines.
Disclosure of Invention
The invention aims to provide a segmented ice melting method of a high-voltage transmission line, which has high reliability, good practicability and convenient and quick implementation.
The segmented ice melting method for the high-voltage transmission line provided by the invention comprises the following steps:
s1, acquiring a section to be de-iced of the power transmission line, and determining a de-icing area;
s2, power failure is carried out on the line of the ice melting section;
s3, arranging an ice-melting short-circuit point and a short-circuit line at one end of the ice-melting area determined in the step S1, and arranging a direct-current ice-melting device at the other end of the ice-melting area determined in the step S1;
s4, connecting the input end of the direct-current ice melting device set in the step S3 with the low-voltage power transmission line, and connecting the output end of the direct-current ice melting device with the other end of the ice melting area determined in the step S1 through an ice melting cable;
s5, starting the direct-current ice melting device to realize segmented ice melting on the high-voltage transmission line;
and S6, after ice melting is finished, detaching the short-circuit line, the ice melting cable and the direct-current ice melting device, and finishing ice melting operation.
Determining the ice melting region in step S1, specifically determining the ice melting region by using the following principle:
r1, covering (containing or equal to) a section to be ice-melted by a line section of the ice-melting area;
r2, one end of the ice melting area is convenient to connect (the tower call height is below 40 m) and is convenient to transport (a rural road or a road above 1km of the iron tower of the end line is convenient for personnel to carry the ice melting short-circuit wire and hardware below the iron tower); the other end of the ice melting area is convenient for traffic (a rural road and above is arranged in a port iron tower of 100m, a semi-trailer with the width of 3m and the length of 17m and loaded with the direct-current ice melting device is convenient to transport to a position near the iron tower of 100 m), and a low-voltage (10kV or 35kV) power transmission line is arranged near the position (within 200 m) so as to provide an alternating-current input power supply for the ice melting device.
The direct current ice melting device is a movable direct current ice melting device.
According to the segmented ice melting method for the high-voltage transmission line, the configuration site of the direct-current ice melting device is moved from the transformer substation to the middle of the line, and the ice melting short-circuit point is also moved from the transformer substation on the other side of the line to the middle of the line, so that ice melting can be implemented only on the local section of the line; providing an alternating current input power supply of the ice melting device by using a low-voltage line crossed with the ice-coated line; therefore, the method can realize the targeted ice melting of the repeated ice sections in the power transmission line, and compared with the full-line ice melting, the method can greatly reduce the capacity requirement of the ice melting device, thereby reducing the construction difficulty and the cost of an ice melting project, not needing to modify the ice-covered power transmission line and transformer substations at two ends of the ice-covered power transmission line, being relatively easy to implement, and the ice melting device is deployed at a certain position in the middle of the line, not needing to deploy the ice melting device at the transformer substations, and being particularly suitable for implementing emergency ice melting on the line which can not deploy the ice melting device at the station end; the invention has high reliability, good practicability and convenient and quick implementation.
Drawings
FIG. 1 is a schematic process flow diagram of the process of the present invention.
FIG. 2 is a schematic diagram of the process of the present invention as it is carried out in situ.
FIG. 3 is a schematic field view of an embodiment of the method of the present invention.
Detailed Description
FIG. 1 is a schematic flow chart of the method of the present invention, and FIG. 2 is a schematic flow chart of the method of the present invention when the method is carried out on site: the segmented ice melting method for the high-voltage transmission line provided by the invention comprises the following steps:
s1, acquiring a section to be ice-melted (M2# -M3 #) so as to determine an ice-melting area (M1# -M4 #); specifically, the ice melting area is determined by adopting the following principle:
r1, the line length of the ice melting area is greater than or equal to the section to be melted;
r2, one end of the ice melting area is convenient to connect (the tower call height is below 40 m) and is convenient to transport (a rural road or a road above 1km of the iron tower of the end line is convenient for personnel to carry the ice melting short-circuit wire and hardware below the iron tower); the other end of the ice melting area is convenient to traffic (a rural road and above is arranged in a port iron tower 100m, a semi-trailer with the width of 3m and the length of 17m and loaded with the direct-current ice melting device is convenient to transport to a position near the iron tower within 100 m), and a low-voltage (10kV or 35kV) power transmission line is arranged near (within 200 m) the position so as to provide an alternating-current input power supply for the ice melting device;
s2, power failure is carried out on the line of the ice melting section;
s3, arranging an ice-melting short-circuit point and a short-circuit line at one end of the ice-melting area determined in the step S1 (the short-circuit line in the figure 2 is arranged at M4#), and arranging a direct-current ice-melting device at the other end of the ice-melting area determined in the step S1; the preferred movable direct current ice melting device is, for example, an HZR-Y12 movable direct current ice melting device produced by Hunan Electricity research technology Limited, Hunan province, which adopts a mode of combining a gear-adjustable 12-pulse rectifier transformer and a diode-type 12-pulse rectifier, and outputs large-range adjustable direct current ice melting voltage by adjusting the gear of the transformer and the serial-parallel combination mode of the rectifiers, so that ice melting requirements of different lines are met, the whole set of device is arranged on a semitrailer plate, and the whole size is 18m long, 3m wide and 4.2m high;
s4, connecting the input end (N1#) of the direct-current ice melting device set in the step S3 with a low-voltage power transmission line, and connecting the output end with the other end (M1# in figure 2) of the ice melting area determined in the step S1 through an ice melting cable;
s5, starting the direct-current ice melting device to realize segmented ice melting on the high-voltage transmission line;
and S6, after ice melting is finished, detaching the short-circuit line, the ice melting cable and the direct-current ice melting device, and finishing ice melting operation.
The process of the invention is further illustrated below with reference to one example:
as shown in fig. 3: aiming at a 500kV ampere wire with a serious icing problem, the wire type of the wire is 4 multiplied by JLHA3-425, the total length of the wire is 35.4km, wherein a 48# to 67# tower is positioned in an area easy to ice (the length of the wire is 12km), the 68# tower is close to a 95# tower of a 10kV Baihua wire, a cross point is beside a road, the ice melting vehicle is convenient to deploy and position, and a 42# tower is low in height and close to the road, so that personnel and vehicles are convenient to approach. The 10kV Baihua line is a distribution network line with 35kV total spread and variable output, and the distance from the distribution network line to a 95# tower is 8 km. Aiming at the line characteristics, the designed segmented ice melting system comprises: arranging an ice melting short-circuit point at a 42# tower of a 500kV ampere-double line, and arranging a movable direct-current ice melting device at a 68# tower, wherein the rated parameters of the movable direct-current ice melting device are as follows: the rated capacity is 8MW, the rated input is 10kV, and the rated direct current output is 2 kV/4000A. The device comprises components such as a 10kV switch cabinet, an ice melting transformer, a 12-pulse rectifier, an ice melting output knife switch and a control system. The direct current output side of the device is connected to an ampere double wire on a 500kV ampere double wire 68# tower through 4 YJV-300 cables per phase, the alternating current input side of the device is connected to a 95# tower of a 10kV Baihua wire through 1 YJV-300 cable per phase, 10kV Baihua wire spread by a 35kV bus is used for providing alternating current input voltage for the mobile direct current ice melting device, and the alternating current input voltage is rectified and converted into proper voltage and then is transmitted to an ice coating line of the 500kV ampere double wire of a line to be melted with ice for conducting current ice melting.
Claims (3)
1. A segmented ice melting method for a high-voltage transmission line comprises the following steps:
s1, acquiring a section to be de-iced, and determining a de-icing area;
s2, power failure is carried out on the line of the ice melting section;
s3, arranging an ice-melting short-circuit point and a short-circuit line at one end of the ice-melting area determined in the step S1, and arranging a direct-current ice-melting device at the other end of the ice-melting area determined in the step S1;
s4, connecting the input end of the direct-current ice melting device set in the step S3 with the low-voltage power transmission line, and connecting the output end of the direct-current ice melting device with the other end of the ice melting area determined in the step S1 through an ice melting cable;
s5, starting the direct-current ice melting device to realize segmented ice melting on the high-voltage transmission line;
and S6, after ice melting is finished, detaching the short-circuit line, the ice melting cable and the direct-current ice melting device, and finishing ice melting operation.
2. The method for segmented deicing of a high-voltage transmission line according to claim 1, characterized in that the step of determining the deicing region in step S1 is specifically performed by using the following principles:
r1, the line length of the ice melting area is greater than or equal to the section to be melted;
r2, one end of the ice melting area is convenient to connect and convenient to transport, the convenient connection is defined as that the tower call height is below 40m, and the convenient transport is defined as that a country road or above exists in 1km of the iron tower of the end line; the other end of the ice melting area is convenient to traffic, a low-voltage power transmission line is arranged nearby, the convenience of traffic is defined as that a country road and above is arranged in a port iron tower 100m, the nearby road is defined to be within 200m, and the low voltage is defined to be 10kV or 35 kV.
3. The method according to claim 1 or 2, wherein the dc de-icing device is a mobile dc de-icing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911202362.8A CN110854738A (en) | 2019-11-29 | 2019-11-29 | Segmented ice melting method for high-voltage transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911202362.8A CN110854738A (en) | 2019-11-29 | 2019-11-29 | Segmented ice melting method for high-voltage transmission line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110854738A true CN110854738A (en) | 2020-02-28 |
Family
ID=69606495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911202362.8A Pending CN110854738A (en) | 2019-11-29 | 2019-11-29 | Segmented ice melting method for high-voltage transmission line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110854738A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105826860A (en) * | 2016-05-04 | 2016-08-03 | 国网新疆电力公司哈密供电公司 | Method for melting ice and snow of transmission line |
| CN107516846A (en) * | 2017-08-30 | 2017-12-26 | 国网湖南省电力公司 | New de-icing method for agriculture distribution |
| CN108092182A (en) * | 2017-12-28 | 2018-05-29 | 国网湖南省电力有限公司 | Ultra-high-tension power transmission line is segmented de-icing method and system |
-
2019
- 2019-11-29 CN CN201911202362.8A patent/CN110854738A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105826860A (en) * | 2016-05-04 | 2016-08-03 | 国网新疆电力公司哈密供电公司 | Method for melting ice and snow of transmission line |
| CN107516846A (en) * | 2017-08-30 | 2017-12-26 | 国网湖南省电力公司 | New de-icing method for agriculture distribution |
| CN108092182A (en) * | 2017-12-28 | 2018-05-29 | 国网湖南省电力有限公司 | Ultra-high-tension power transmission line is segmented de-icing method and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101442198B (en) | Ice-melting mode and apparatus for mobile DC power supply | |
| CN101242087A (en) | Ice fusion method for power transmission line | |
| CN202749782U (en) | Transmission line ice melting system implemented by switching operation in whole process | |
| CN101325322A (en) | AC line-feeding deicing connection plan for current-exchanging station | |
| CN102623941B (en) | Direct current deicing device for 10KV rural power grid distribution line | |
| CN103490645A (en) | Single-phase electrified railway contact net direct-current deicing device and system | |
| CN101604833B (en) | Ground wire deicing device capable of combined use | |
| CN101794977B (en) | Long-distance transmission line deicing method and device | |
| CN201341007Y (en) | High-low voltage power line deicing vehicle | |
| CN101667722B (en) | Method for melting ice and snow on power transmission and distribution lines by low voltage and high current | |
| CN110932215A (en) | System and method for deicing overhead line by using photovoltaic power generation | |
| CN108092182B (en) | Segmented ice melting method and system for high-voltage transmission line | |
| Zhu et al. | Research on melting and de-icing methods of lines in distribution network | |
| CN108923365B (en) | Transmission line wire suitable for live online ice melting and use method thereof | |
| CN112234567A (en) | Novel uncontrolled direct current ice melting device and ice melting method thereof | |
| CN112102984A (en) | Novel steel core ice melting insulated wire and ice melting system and method thereof | |
| CN103337824A (en) | Segmentation direct-current deicing system of extreme high voltage direct-current transmission line | |
| CN104577926B (en) | The test platform of wire ground wire combination DC ice melting can be realized | |
| CN110854738A (en) | Segmented ice melting method for high-voltage transmission line | |
| CN202424080U (en) | Alternating-current de-icing system for traction network of electrified railway | |
| CN105761837A (en) | Optical fiber composite overhead ground wire with fast ice melting function | |
| CN203689973U (en) | High-resistance steel core ice-melting lead | |
| CN102299499A (en) | Ice melting scheme of circuit alternating-current short circuit after voltage reduction for 10kV power supply through 35kV main transformer | |
| CN108418166A (en) | A kind of fixed short-circuit AC ice melting device of allocated radio change | |
| CN202474771U (en) | Mobile overhead ground wire direct-current de-icing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200228 |