CN105529667A - DC ice melting system and DC ice melting method for UHV ground wires - Google Patents
DC ice melting system and DC ice melting method for UHV ground wires Download PDFInfo
- Publication number
- CN105529667A CN105529667A CN201610100105.3A CN201610100105A CN105529667A CN 105529667 A CN105529667 A CN 105529667A CN 201610100105 A CN201610100105 A CN 201610100105A CN 105529667 A CN105529667 A CN 105529667A
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- ground wire
- ice
- piezo
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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
- 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
-
- 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
Abstract
The present invention discloses a DC (Direct Current) ice melting system and a DC ice melting method for UHV (Ultra-high Voltage) ground wires. The DC ice melting system comprises a varistor, a DC ice melting device and a plurality of shorting wires, wherein the varistor is mounted between the ground wire of a UHV power transmission line section requiring melting ice and a pole tower, and between the ground wire of the UHV power transmission line section requiring melting ice and the ground wire of other sections; the shorting wires are used for connecting the UHV power transmission line after a power failure with the ground wire of a UHV line selecting section; and two poles of the DC ice melting device are connected with two phases of the UHV power transmission line.
Description
Technical field
The invention belongs to electric function technical field, be specifically related to a kind of direct current ice melting system and direct current ice melting method of ultra high voltage ground wire.
Background technology
Along with the development of China's electric utility, extra-high voltage grid develops into the bulk transmission grid of whole electrical network just gradually, its transmission reliability is particularly important, and extra high voltage line fed distance is long, institute, through local climate complicated condition, very easily causes serious icing, extra high voltage line overhead ground wire is not owing to having load current, its ice thickness can, far beyond aerial condutor, very easily cause ground thread breakage, tower or the excessive wire of sag to accidents such as ground wire electric discharges, to have a strong impact on the safe and stable operation of extra-high voltage grid.
At present, can alleviate the most economical effective method of powerline ice-covering loss, be carry out electric current ice-melt work to transmission line; Ground wire induction reactance is large, generally takes DC ice melting, and UHV transmission line ground wire is generally directly connected with ground, and ice melting current cannot directly put on overhead ground wire.In existing ground wire deicing technology, generally take two ground wire series connection ice-melts, and ultra high voltage ground wire circuit is long, resistance is large, general deicing device cannot meet ice-melt capacity requirement.And, take discharging gap to carry out all insulation transformation to overhead ground wire in more existing ground wire deicing methods, but when icing is serious discharging gap also may because of icing bridge joint, overhead ground wire is still in ground state, cannot implement ice-melt; And all insulation transformation is carried out to circuit, after ice-melt completes, also need the facility removing transformation, waste time and energy; If need repeatedly ice-melt, to the transformation of circuit with remove and will take a large amount of time and work energy.
Summary of the invention
The object of the present invention is to provide one can carry out ice-melt operation to ultra high voltage ground wire fast, only need once to transform and can complete repetition ice-melt work, and the direct current ice melting system of the ultra high voltage ground wire that flexible operation is simple, deicing device capacity is little, with low cost and direct current ice melting method.
The direct current ice melting system of a kind of ultra high voltage ground wire provided by the invention, comprise piezo-resistance, DC de-icing device and several shorting stub, between the ground wire that described piezo-resistance is arranged on the UHV transmission line section needing between the ground wire of the UHV transmission line section of ice-melt and shaft tower and need ice-melt and the ground wire of other section, the ground wire of section is chosen in described shorting stub for connecting the extra-high voltage transmission line after power failure and extra high voltage line, wherein two being connected of the two poles of the earth of described DC de-icing device and extra-high voltage transmission line
The direct current ice melting method of the ultra high voltage ground wire of the direct current ice melting system of the aforementioned ultra high voltage ground wire of employing provided by the invention, comprises the steps:
S1. UHV transmission line section icing disaster easily occurring and needs ice-melt is chosen, semi-insulating transformation is carried out: in section, install one group of piezo-resistance between every grade of shaft tower and ground wire additional to choosing section place ground portion, this section ground wire and other section ground wire install one group of piezo-resistance additional and are connected, the through-current capability of piezo-resistance is determined according to the overcurrent multiple of circuit, and the residual voltage value of piezo-resistance is determined according to the maximum output voltage of DC de-icing device;
S2. the UHV transmission line chosen in step S1 is had a power failure, to the three-phase hanging earthing conductor ground connection of described UHV transmission line after power failure, adopt shorting stub to treat that the head end of ice-melting ground wire is connected with the A phase conductor in section, will treat that the end of ice-melting ground wire is connected with the B phase conductor in section;
S3. be connected with A phase conductor described in step S2 by the positive pole of DC de-icing device, the negative pole of DC de-icing device is connected with B phase conductor described in step S2;
S4. take off all earth connections in step S2, start DC de-icing device, ice-melt is carried out to the icing ground wire in section;
S5. after the icing on ground wire in section comes off completely, disconnect and remove DC de-icing device, adopt insulating bar to take off all shorting stubs, ground wire deicing completes.
Further, also comprise the steps:
S0. by the required UHV transmission line segmentation carrying out ice-melt, the ground wire between each segmentation installs piezo-resistance additional, is convenient to the segmentation ice-melt carrying out ground wire.
Further, the piezo-resistance described in step S1 is zinc oxide valve plate.
Further, the through-current capability of the piezo-resistance described in step S1 is determined according to the overcurrent multiple of circuit, for ensureing that the through-current capability of piezo-resistance is greater than the lightning current of ice-melt area maximum possible.
Further, the residual voltage value of the piezo-resistance described in step S1 is determined according to the maximum output voltage of DC de-icing device, for the residual voltage value ensureing piezo-resistance is 150% ~ 250% of DC de-icing device maximum output voltage.
This direct current ice melting method provided by the invention, by carrying out semi-insulating transformation to target DC ice-melting, when keeping ultra high voltage ground wire deicing and the insulation of steel tower, efficiently avoid icing serious time insulation be bridged and cannot implement ice-melt, guarantee that ground wire deicing reliably carries out, keep ground wire to prevent superpotential function simultaneously; In addition, the semi-insulating transformation that the present invention carries out ground wire, in deicing processes, only need transformation once and do not need to carry out other any operations, and do not need after ice-melt work completes remove described in semi-insulating transformation, next ice-melt is facilitated to operate, therefore cost of the present invention is extremely low, considerably reduces workload during ice-melt, improves ice-melt efficiency.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the semi-insulating transformation of ground wire of the present invention.
Schematic diagram when Fig. 2 is de-icing method of the present invention enforcement.
Embodiment
Be illustrated in figure 1 the schematic diagram of the semi-insulating transformation of ground wire of the present invention: the semi-insulating transformation of this ground wire that the present invention proposes, be different from background technology by installing insulator string and by-pass knife switch switch between ground wire and earth wire support additional, but piezo-resistance is installed additional between ground wire and earth wire support, comprise piezo-resistance, DC de-icing device and several shorting stub, between the ground wire that described piezo-resistance is arranged on the UHV transmission line section needing between the ground wire of the UHV transmission line section of ice-melt and shaft tower and need ice-melt and the ground wire of other section, the ground wire of section is chosen in described shorting stub for connecting the extra-high voltage transmission line after power failure and extra high voltage line, wherein two being connected of the two poles of the earth of described DC de-icing device and extra-high voltage transmission line, the semi-insulated transformation of described ground wire can be realized, and ensure that the through-current capability of piezo-resistance is greater than the lightning current of ice-melt area maximum possible, and ensure that the residual voltage value of piezo-resistance is 150% ~ 250% of DC de-icing device maximum output voltage.Due to the characteristic of piezo-resistance, after therefore installing piezo-resistance additional, do not need the chopper switch installing bypass again additional, and described semi-insulating transformation is also without the need to removing, time saving and energy saving, but also the carrying out of convenient ice-melt work next time.
The direct current ice melting method of this ultra high voltage ground wire provided by the invention, specifically comprises the steps:
S1. by the required UHV transmission line segmentation carrying out ice-melt, the ground wire between each segmentation installs piezo-resistance additional, is convenient to the segmentation ice-melt carrying out ground wire;
S2. UHV transmission line section icing disaster easily occurring and needs ice-melt is chosen, semi-insulating transformation is carried out: in section, install one group of piezo-resistance between every grade of shaft tower and ground wire additional to choosing section place ground portion, this section ground wire and other section ground wire install one group of piezo-resistance additional and are connected, as zinc oxide valve plate;
The through-current capability of piezo-resistance is determined according to the overcurrent multiple of circuit, need ensure that the through-current capability of piezo-resistance is greater than the lightning current of ice-melt area maximum possible;
The residual voltage value of piezo-resistance is determined according to the maximum output voltage of DC de-icing device, need ensure that the residual voltage value of piezo-resistance is 150% ~ 250% of DC de-icing device maximum output voltage, that is ensure the residual voltage value of piezo-resistance more taller than the maximum output voltage of DC de-icing device go out 50% ~ 150%.；
S3. the UHV transmission line chosen in step S2 is had a power failure, to the three-phase hanging earthing conductor ground connection of described UHV transmission line after power failure, adopt shorting stub to treat that the head end of ice-melting ground wire is connected with the A phase conductor in section, will treat that the end of ice-melting ground wire is connected with the B phase conductor in section;
S4. be connected with A phase conductor described in step S3 by the positive pole of DC de-icing device, the negative pole of DC de-icing device is connected with B phase conductor described in step S3;
S5. take off all earth connections in step S3, start DC de-icing device, ice-melt is carried out to the icing ground wire in section;
S6. after the icing on ground wire in section comes off completely, disconnect and remove DC de-icing device, adopt insulating bar to take off all shorting stubs, ground wire deicing completes;
S7. repeating said steps S1 ~ S6, completes the ice-melt work of all sections of UHV transmission line.
Be illustrated in figure 2 schematic diagram when de-icing method of the present invention is implemented: first semi-insulating transformation is carried out to ultra high voltage ground wire, after semi-insulating transformation, the both positive and negative polarity of DC de-icing device is connected respectively B phase conductor and A phase conductor, treat that two ground wire head and ends of ice-melting ground wire are connected with B phase conductor with A phase conductor respectively by shorting stub, do not need ice-melting ground wire section not access ice-melt loop, finally realize semi-insulating ultra high voltage ground wire DC ice melting.
The invention has the beneficial effects as follows:
(1) when can guarantee ultra high voltage ground wire deicing and the insulation of steel tower, efficiently avoid icing serious time insulation be bridged and cannot implement ice-melt, guarantee that ground wire deicing reliably carries out, keep ground wire to prevent superpotential function simultaneously;
(2) the semi-insulating transformation of ultra high voltage ground wire complete after each ice-melt do not need to carry out state of insulation switching, greatly reduce workload during ice-melt, improve ice-melt efficiency;
(3) the ultra high voltage ground wire for icing section carries out ice-melt, and section circuit is short, and line resistance is little, two ground line parallel ice-melts, significantly reduce ice-melt voltage and the power of ground wire deicing device, reduce deicing device development difficulty, improve the feasibility of ultra high voltage ground wire deicing;
(4) take two wires as ice-melt passage, implement ice-melt to icing section selectively, conductor resistance is little, and ground wire DC de-icing device is positioned at centre simultaneously, and a set of deicing device can cover the ice-melt of whole piece UHV transmission line ground wire, and economy is high.
Claims (6)
1. the direct current ice melting system of a ultra high voltage ground wire, it is characterized in that: comprise piezo-resistance, DC de-icing device and several shorting stub, between the ground wire that described piezo-resistance is arranged on the UHV transmission line section needing between the ground wire of the UHV transmission line section of ice-melt and shaft tower and need ice-melt and the ground wire of other section, the ground wire of section is chosen in described shorting stub for connecting the extra-high voltage transmission line after power failure and extra high voltage line, wherein two being connected of the two poles of the earth of described DC de-icing device and extra-high voltage transmission line.
2. adopt a direct current ice melting method for the ultra high voltage ground wire of the direct current ice melting system of ultra high voltage ground wire described in claim 1, comprise the steps:
S1. UHV transmission line section icing disaster easily occurring and needs ice-melt is chosen, semi-insulating transformation is carried out: in section, install one group of piezo-resistance between every grade of shaft tower and ground wire additional to choosing section place ground portion, this section ground wire and other section ground wire install one group of piezo-resistance additional and are connected, the through-current capability of piezo-resistance is determined according to the overcurrent multiple of circuit, and the residual voltage value of piezo-resistance is determined according to the maximum output voltage of DC de-icing device;
S2. the UHV transmission line chosen in step S1 is had a power failure, to the three-phase hanging earthing conductor ground connection of described UHV transmission line after power failure, adopt shorting stub to treat that the head end of ice-melting ground wire is connected with the A phase conductor in section, will treat that the end of ice-melting ground wire is connected with the B phase conductor in section;
S3. be connected with A phase conductor described in step S2 by the positive pole of DC de-icing device, the negative pole of DC de-icing device is connected with B phase conductor described in step S2;
S4. take off all earth connections in step S2, start DC de-icing device, ice-melt is carried out to the icing ground wire in section;
S5. after the icing on ground wire in section comes off completely, disconnect and remove DC de-icing device, adopt insulating bar to take off all shorting stubs, ground wire deicing completes.
3. the direct current ice melting method of ultra high voltage ground wire according to claim 2, characterized by further comprising following steps:
S0. by the required UHV transmission line segmentation carrying out ice-melt, the ground wire between each segmentation installs piezo-resistance additional, is convenient to the segmentation ice-melt carrying out ground wire.
4. the direct current ice melting method of the ultra high voltage ground wire according to Claims 2 or 3, is characterized in that the piezo-resistance described in step S1 is zinc oxide valve plate.
5. the direct current ice melting method of the ultra high voltage ground wire according to Claims 2 or 3, it is characterized in that the through-current capability of the piezo-resistance described in step S1 is determined according to the overcurrent multiple of circuit, for ensureing that the through-current capability of piezo-resistance is greater than the lightning current of ice-melt area maximum possible.
6. the direct current ice melting method of the ultra high voltage ground wire according to Claims 2 or 3, it is characterized in that the residual voltage value of the piezo-resistance described in step S1 is determined according to the maximum output voltage of DC de-icing device, for the residual voltage value ensureing piezo-resistance is 150% ~ 250% of DC de-icing device maximum output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610100105.3A CN105529667A (en) | 2016-02-23 | 2016-02-23 | DC ice melting system and DC ice melting method for UHV ground wires |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610100105.3A CN105529667A (en) | 2016-02-23 | 2016-02-23 | DC ice melting system and DC ice melting method for UHV ground wires |
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| CN105529667A true CN105529667A (en) | 2016-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610100105.3A Withdrawn CN105529667A (en) | 2016-02-23 | 2016-02-23 | DC ice melting system and DC ice melting method for UHV ground wires |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106384989A (en) * | 2016-11-18 | 2017-02-08 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Device and method for performing DC ice melting on overhead ground wire of power transmission line |
| 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 |
| CN111463736A (en) * | 2020-05-08 | 2020-07-28 | 国网湖北省电力有限公司 | Direct ground wire grounding ice melting method |
| CN112271681A (en) * | 2020-10-27 | 2021-01-26 | 中国电力工程顾问集团中南电力设计院有限公司 | Leading structure of direct-current ground wire ice melting power supply of extra-high voltage multi-terminal direct-current converter station |
| CN113541036A (en) * | 2021-05-27 | 2021-10-22 | 国网浙江省电力有限公司台州供电公司 | Real-time monitoring OPGW optical cable direct current ice melting system |
-
2016
- 2016-02-23 CN CN201610100105.3A patent/CN105529667A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106384989A (en) * | 2016-11-18 | 2017-02-08 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Device and method for performing DC ice melting on overhead ground wire of power transmission line |
| 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 |
| CN108092182B (en) * | 2017-12-28 | 2021-01-15 | 国网湖南省电力有限公司 | Segmented ice melting method and system for high-voltage transmission line |
| CN111463736A (en) * | 2020-05-08 | 2020-07-28 | 国网湖北省电力有限公司 | Direct ground wire grounding ice melting method |
| CN112271681A (en) * | 2020-10-27 | 2021-01-26 | 中国电力工程顾问集团中南电力设计院有限公司 | Leading structure of direct-current ground wire ice melting power supply of extra-high voltage multi-terminal direct-current converter station |
| CN112271681B (en) * | 2020-10-27 | 2022-03-29 | 中国电力工程顾问集团中南电力设计院有限公司 | Leading structure of direct-current ground wire ice melting power supply of extra-high voltage multi-terminal direct-current converter station |
| CN113541036A (en) * | 2021-05-27 | 2021-10-22 | 国网浙江省电力有限公司台州供电公司 | Real-time monitoring OPGW optical cable direct current ice melting system |
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Application publication date: 20160427 |
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