CN101272041B - Wire-protecting and de-icing method of unit type high tension power line - Google Patents
Wire-protecting and de-icing method of unit type high tension power line Download PDFInfo
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- CN101272041B CN101272041B CN2008100665404A CN200810066540A CN101272041B CN 101272041 B CN101272041 B CN 101272041B CN 2008100665404 A CN2008100665404 A CN 2008100665404A CN 200810066540 A CN200810066540 A CN 200810066540A CN 101272041 B CN101272041 B CN 101272041B
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Abstract
The invention relates to a unit type high voltage transmission line wire-protection ice-melting method which includes the following steps: A. defining same-phase cracking lead wires (11, 12) of a certain section as a wire-protection ice-melting unit and adopting conductive spacers (90) at the positions of two ends of the unit; B. arranging a wire-protection ice-melting device (100) in the unit, wherein a loop circuit between the two spacers (90) and the cracking lead wires (11,12) are formed by the wire-protection ice-melting current output by the wire-protection ice-melting device (100), thus generating heat so as to realize wire-protection and ice-melting. The wire-protection and ice-melting device includes a wire-protection and ice-melting current control system and a wire-protection and ice-melting power. A corresponding wire-protection and ice-melting current used for heating the cracking lead wires (11, 12) is output by the wire-protection and ice-melting power according to the wire-protection and ice-melting current parameters, so as to realize wire-protection and ice-melting. Compared with the prior art, the method of the invention has the advantages of shortcut power obtaining, low cost, flexible control and good wire-protection and ice-melting effect, etc.
Description
Technical field:
The present invention relates to that a joule heating that utilizes the transmission pressure electric current to produce prevents powerline ice-covering (be commonly called as and protect line) or to the method for icing transmission line ice-melt (being referred to as wire-protecting and de-icing), special is the ultra-high-tension power transmission line of bundle conductor at transmission pressure, under the situation of the normal on-load of lead, local transmission pressure is carried out the method for wire-protecting and de-icing protection.
Background technology:
Current flow heats method ice-melt protection is to pass to big electric current in transmission pressure, by the icing on the thermal effect thawing lead of conductor resistance.Whether transmission line needs to stop transport during by ice-melt, and current flow heats method de-icing technology can be divided into on-load ice-melt and on-load ice-melt two classes not.
The ice-melting method of on-load mainly is not the short circuit ice-melting method.This technology is temporarily transferred to All other routes by scheduling with electric load earlier, and external again short circuit ice-melt power supply provides big electric current heating ice-melt on the line.This method advantage is that principle is simple, with low cost, can be used for the transmission line of a plurality of voltage levels, and shortcoming is to need the stoppage in transit circuit, complicated operation (needing scheduling, short circuit circuit, external short circuit ice-melt power supply), and required short circuit ice-melt power supply capacity is bigger.
The on-load de-icing technology can reduce the impressed current ice-melt and increase two kinds of circuit trend ice-melts.
Increasing the ice-melt of circuit trend is the through-put power that increases transmission line by scheduling, the method that the current in wire increase facilitates circuit to heat up.The advantage of this kind method is need not stop transport, and cost is lower, operates simply relatively, but the heat that lead produces is limited, only is suitable for weather and not too badly reaches under the lighter situation of wire icing and use.
The on-load de-icing technology of impressed current is at present only in the local use of minority, China Baoji Power Supply Bureau has set up the ice-melt station in 1984, its principle is to utilize circuit itself, on double bundle conductor, form the loop by the autotransformer back of boosting, the generation electric current impels the lead heating and prevents conductor glaze formation or melt icing that this method need provide identical withstand voltage other high voltage ice-melt transformer of level with power transmission line, capacity requirement is also very big, and price is high.
Said method all is to be that object carries out the current flow heats wire-protecting and de-icing with all fronts road, but much break because of icing causes circuit, iron tower collapses and ice the special microclimate band landform that the power system accident that dodges often occurs in the easy icing of fraction, the local wire-protecting and de-icing technology that design disperses can prevent the ice damage accident, can reduce the cost of wire-protecting and de-icing again, the regional area that therefore the present invention is directed to transmission line has designed the unit wire-protecting and de-icing method.
Summary of the invention:
Existing on-load wire-protecting and de-icing technical scheme power supply capacity requirement height, withstand voltage insulation difficulty are big in order to overcome, complicated operation and the lower deficiency of efficient, and the present invention proposes that a kind of power supply is convenient, cost is low and control wire-protecting and de-icing method of unit type high tension power line flexibly.
The technical scheme that institute of the present invention technical solution problem is adopted is:
Propose a kind of wire-protecting and de-icing method of unit type high tension power line, comprise the steps:
A. defining certain section homophase bundle conductor is the wire-protecting and de-icing unit, adopts the conducting interval rod in this unit end positions;
B., the wire-protecting and de-icing device is set in described unit, this wire-protecting and de-icing device utilizes the operating current conversion on the bundle conductor to produce the wire-protecting and de-icing electric current, and this wire-protecting and de-icing electric current forms loop and produces heat between described two conducting intervals rod and two bundle conductors realizes wire-protecting and de-icing;
In the described steps A,, then all adopt the insulated type conductor spacer if between two conducting interval rods, need to install additional again conductor spacer (be used for protection and support bundle conductor).
In the inventive method, described wire-protecting and de-icing device comprises wire-protecting and de-icing power supply and wire-protecting and de-icing current control system.Direct current mode or exchange way are adopted in the wire-protecting and de-icing power supply output of described wire-protecting and de-icing device:
When the direct current mode is adopted in the output of wire-protecting and de-icing power supply, its main circuit topology is made up of transducing current transformer and controlled rectifier, described transducing current transformer primary side is series in the bundle conductor, secondary side connects the controlled rectifier AC side, the controlled rectifier DC side connects filter capacitor, and the filter capacitor two ends are the output of wire-protecting and de-icing electric current;
When exchange way is adopted in the output of wire-protecting and de-icing power supply, its main circuit topology is by the transducing current transformer, controlled rectifier, controlled inverter and isolated converters are formed, described transducing current transformer and controlled rectifier are formed rectification circuit, described controlled inverter and isolated converters are formed inverter circuit, the DC side of rectification circuit and inverter circuit is all in parallel with filter capacitor, alternating current on the described rectification circuit induction bundle conductor also partly or entirely is rectified into direct current, described inverter circuit this direct current is reverse into alternating current again and by isolated converters output, promptly the secondary side of isolated converters is the output of wire-protecting and de-icing electric current.
As the further improvement of the inventive method, the main power device of controlled rectifier and controlled inverter adopts controlled power electronic device in the described wire-protecting and de-icing power supply, as one or more of controllable silicon, IGBT, MOSFET, GTO; By control to controlled rectifier and controlled inverter, when described wire-protecting and de-icing electric power outputting current is zero, transducing current transformer secondary side equivalence is in short-circuit condition, the electric parameter equivalence of bundle conductor is in the conventional operation state, the wire-protecting and de-icing electric current adopts from null value and starts the gentle slow control method that falls that rises, and avoids the impact of the sudden change of big electric current to lead.
In the inventive method, described wire-protecting and de-icing current control system is gathered relevant informations such as ambient temperature and humidity, conductor temperature, ice covering thickness, current in wire, according to being solidificated in intrasystem procedure triggers wire-protecting and de-icing task, calculating the size of wire-protecting and de-icing electric current, and the control signal that generates corresponding controlled rectifier, controlled inverter realizes the accurate control of wire-protecting and de-icing electric current; The wire-protecting and de-icing current control system also possesses manual command and receives and the status information of equipment sending function.
In the inventive method, described wire-protecting and de-icing device is installed near the insulator string, and interior dress fan disperses self-radiating, and institute's heat dissipation capacity is used for the icing protection of insulator string.
Compare with prior art, the beneficial effect of wire-protecting and de-icing method of unit type high tension power line of the present invention is:
1. be object with the ultra-high-tension power transmission line that adopts bundle conductor, under the situation that does not influence the circuit operate as normal, adopt the principle of electric current Joule effect heating wires, can realize that the transmission pressure of subrange carries out the wire-protecting and de-icing protection, and can effectively carry out the icing protection of insulator string;
2. this method is under the situation that does not reduce the transmission line reliability requirement, realize the on-line operation of wire-protecting and de-icing device, when non-wire-protecting and de-icing operating state, the electrical operation parameter of former transmission line is unaffected, when the wire-protecting and de-icing operating state, parameter influence to transmission line is very little, still can guarantee the normal on-load transmission of electricity of circuit;
3. the wire-protecting and de-icing device phase-splitting of this method is independently installed, and be in same voltage level with phase conductor, need not special requirement of withstand voltage, insulation costs is very low;
4. the wire-protecting and de-icing size of current of this method output can be controlled flexibly, can realize slow the falling of slow liter under null value startup and the operating state, can avoid the impact of big current break to lead;
5. this method equipment is suitable for installing nearby near insulator string, can satisfy the requirement of insulator string icing protection;
6. this method need not to add independent wire-protecting and de-icing power supply, is convenient to disperse to install and online long-time running.
Description of drawings:
Fig. 1 is the wire-protecting and de-icing cell schematics of wire-protecting and de-icing method of unit type high tension power line double bundle conductor of the present invention, and the wire-protecting and de-icing current direction is represented in the sensing of the arrow A among the figure;
Fig. 2 is that the wire-protecting and de-icing power supply of described wire-protecting and de-icing method is exported the main circuit topology schematic diagram when adopting the direct current mode;
Fig. 3 is that the wire-protecting and de-icing power supply of described wire-protecting and de-icing method is exported the main circuit topology schematic diagram when adopting exchange way;
Fig. 4 is the theory diagram of the wire-protecting and de-icing current control system of described wire-protecting and de-icing method.
Among the figure: the 100th, wire-protecting and de-icing device, the 80th, insulated type conductor spacer, the 90th, conducting interval rod, the 11, the 12nd, bundle conductor, the 20th, change of current current transformer, the 21st, isolated converters, the 30th, controlled rectifier, the 31st, controlled inverter, the 4th, filter capacitor, the 9th, insulator string.
Embodiment:
Wire-protecting and de-icing method of unit type high tension power line of the present invention, comprises the steps: to shown in Figure 4 in conjunction with Fig. 1
A. define certain section homophase bundle conductor 11,12 and be the wire-protecting and de-icing unit, adopt conducting interval rod 90 in this unit end positions;
B., wire-protecting and de-icing device 100 is set in described unit, and the wire-protecting and de-icing electric current of these wire-protecting and de-icing device 100 outputs forms loop and produces heat between described two conducting intervals rod 90 and bundle conductor 11,12 realizes wire-protecting and de-icing.
Described wire-protecting and de-icing device 100 comprises wire-protecting and de-icing power supply and wire-protecting and de-icing current control system.
Direct current mode or exchange way are adopted in the wire-protecting and de-icing power supply output of described wire-protecting and de-icing device 100:
When the direct current mode is adopted in the output of wire-protecting and de-icing power supply, its main circuit topology is made up of transducing current transformer 20 and controlled rectifier 30, described transducing current transformer 20 primary sides are series in the bundle conductor 11,12, secondary side connects controlled rectifier 30 AC side, controlled rectifier 30 DC side connect filter capacitor 4, and filter capacitor 4 two ends are the output of wire-protecting and de-icing electric current;
When exchange way is adopted in the output of wire-protecting and de-icing power supply, its main circuit topology is by transducing current transformer 20, controlled rectifier 30, controlled inverter 31 and isolated converters 21 are formed, described transducing current transformer 20 is formed rectification circuit with controlled rectifier 30, described controlled inverter 31 is formed inverter circuit with isolated converters 21, the DC side of rectification circuit and inverter circuit is all in parallel with filter capacitor 4, described rectification circuit is responded to described bundle conductor 11, alternating current on 12 also partly or entirely is rectified into direct current, described inverter circuit this direct current is reverse into alternating current again and by isolated converters 21 outputs, promptly the secondary side of isolated converters 21 is the output of wire-protecting and de-icing electric current.
The main power device of controlled rectifier 30 and controlled inverter 31 adopts controlled power electronic device in the described wire-protecting and de-icing power supply; When described wire-protecting and de-icing electric power outputting current was zero, transducing current transformer 20 secondary side equivalences were in short-circuit condition, and the electric parameter equivalence of bundle conductor 11,12 is in the conventional operation state; The wire-protecting and de-icing electric current adopts from the null value startup and delays and rises the slow control method that falls, and avoids the impact of big current break to lead.。
The wire-protecting and de-icing current control system is gathered relevant informations such as ambient temperature and humidity, conductor temperature, ice covering thickness, current in wire, according to being solidificated in intrasystem procedure triggers wire-protecting and de-icing task, calculating the size of wire-protecting and de-icing electric current, and generate the control signal of corresponding controlled rectifier 30, controlled inverter 31; System also possesses manual command and receives and the status information of equipment sending function.
Described wire-protecting and de-icing device 100 is installed near the insulator string 9, and interior dress fan disperses self-radiating, and institute's heat dissipation capacity is used for the icing protection of insulator string 9.
But above-mentioned execution mode detailed presentations is:
1, the design of wire-protecting and de-icing unit
When ultra-high-tension power transmission line adopts bundle conductor, for keeping bundle spacing, prevent to mix strand, need to adopt conductor spacer in certain distance range, conventional conductor spacer need not considered the conductivity requirement.This implementing method adopts specific insulated type conductor spacer 80 and electric conductivity well can bear the conducting interval rod 90 of big electric current, certain section bundle conductor is defined as independently wire-protecting and de-icing unit, promptly at the two ends of wire-protecting and de-icing unit, adopt special-purpose electric conductivity favorable conductive conductor spacer 90 to support bundle conductor, inner as then adopt insulated type conductor spacer 80 need install conductor spacer additional the time in the unit, because the short circuit effect of conducting interval rod 90, in the wire-protecting and de-icing unit, form one with bundle conductor 11,12, the wire-protecting and de-icing current loop that conducting interval rod 90 is formed, as shown in Figure 1.Transmission line for adopting multiple fission conductors such as tripartition, quadripartion then is divided into multiple fission conductor two groups, forms similar wire-protecting and de-icing current loop with same way.This method adopts special- purpose conductor spacer 80,90 except satisfying different required electric conductivities, has the performance requirement of conventional conductor spacer concurrently.
The defined wire-protecting and de-icing of this method unit, its wire-protecting and de-icing electric current is 11,12 of homophase bundle conductors in the unit and 90 formation of conducting interval rod current loop only, lead in the trigger unit heats up under the joule heating effect effect, and the unit outer lead is unaffected, and the wire-protecting and de-icing unit of different phase conductors is unrelated, can make each wire-protecting and de-icing device 100 need not the requirement of considering that special insulation is withstand voltage.
The input position of wire-protecting and de-icing electric current is chosen near the insulator string 9, and the own loss heating that is beneficial to wire-protecting and de-icing device 100 is used for the icing of insulator string 9 is protected.
2, wire-protecting and de-icing power supply design
The design of wire-protecting and de-icing power supply has provided two kinds of implementation methods: output adopts direct current mode and output to adopt exchange way.
Method one: the wire-protecting and de-icing power supply of direct current mode is adopted in output
The wire-protecting and de-icing electric power main circuit topology theory of output employing direct current mode as shown in Figure 2, transducing current transformer 20 has two windings and a secondary winding, two windings are connected on respectively in the bundle conductor 11,12, secondary winding links to each other with the AC side of controlled rectifier 30, the DC side of controlled rectifier 30 is in parallel with filter capacitor 4, is exportable required wire-protecting and de-icing electric current at the two ends of filter capacitor 4.
Its working mechanism is: the operating current on the phase bundle conductor 11,12 produces alternating current at the secondary side of transducing current transformer 20, controlled rectifier 30 is with all or part of direct current that is rectified into of this alternating current, by the filter action of filter capacitor 4, this direct current puts on the wire-protecting and de-icing electric current that can become the direct current mode in the unit on the bundle conductor 11,12.
When the no-load voltage ratio (the first side winding number of turn/secondary side winding number of turn) of transducing current transformer 20 is big more, under the situation of equal big or small lead operating current, can realize that the maximum of wire-protecting and de-icing electric current is just big more.
Regulate the control signal of controlled rectifier 30, the secondary winding electric current of transducing current transformer 20 is in dead-short-circuit, full rectification or partial rectification state, when it is in the dead-short-circuit state, the wire-protecting and de-icing electric current of output is zero, the electric parameter equivalence of bundle conductor 11,12 is in the conventional operation state, when it was in full rectification state, the wire-protecting and de-icing electric current of output reached maximum.
Method two: the wire-protecting and de-icing power supply of exchange way is adopted in output
The wire-protecting and de-icing electric power main circuit topology theory of output employing exchange way as shown in Figure 3.Transducing current transformer 20 has two windings and a secondary winding, two windings are connected on respectively in the bundle conductor 11,12, controlled rectifier 30 exchanges the secondary winding output of side joint transducing current transformer 20, form a rectification circuit, controlled inverter 31 is formed an inverter circuit with isolated converters 21, the DC side of rectification circuit and inverter circuit all is connected in parallel with filter capacitor 4, and the secondary side of isolated converters 21 is as the output of wire-protecting and de-icing electric current.
The working mechanism of exchange way wire-protecting and de-icing power supply is: the operating current in the bundle conductor 11,12 produces alternating current in the secondary side induction of transducing current transformer 20, controlled rectifier 30 partly or entirely is rectified into direct current with this alternating current and gives filter capacitor 4 chargings, simultaneously, controlled inverter 31 is reverse into the alternating current of a phase bit with this direct current and exports through the secondary side of isolated converters 21, and the electric current of isolated converters 21 secondary sides output is promptly as the wire-protecting and de-icing electric current.
When the no-load voltage ratio of transducing current transformer 20 is k
1, the no-load voltage ratio of isolated converters 21 is k
2The time, then when controlled rectifier 30 all was rectified into direct current with the secondary side current of transducing current transformer 20, the maximum that the wire-protecting and de-icing electric current of output can reach was the k of bundle conductor 11,12 total work electric currents
1* k
2Doubly (ignoring loss).By adjusting the control signal of controlled rectifier 30, the secondary side current that can change transducing current transformer 20 is rectified into the ratio of direct current, thereby the direct voltage on the control filter capacitor 4 can be realized the control to output wire-protecting and de-icing size of current.
When the wire-protecting and de-icing electric current was zero, the direct voltage on the filter capacitor 4 was zero, and the secondary side equivalence of transducing current transformer 20 is a short-circuit condition, and the equivalent parameters of bundle conductor is similar to normal operating conditions, and the lead operation is unaffected.
The controlled rectifier 30 in method one and the method two in the main circuit topology schematic diagram and the main device of controlled inverter 31 all adopt high-power controlled power electronic device such as IGBT, MOSFET, GTO and controllable silicon, adjust rectification, the inversion parameter of controlled rectifier 30 and controlled inverter 31 by the control signal of controlling controlled power electronic device.
3, wire-protecting and de-icing current control system
The wire-protecting and de-icing current control system of wire-protecting and de-icing method of unit type high tension power line of the present invention, as shown in Figure 4, form by transducer (comprising wire temperature sensor, ambient temperature and humidity transducer, ice-covering thickness sensor, lead operating current transducer, wire-protecting and de-icing current sensor), man-machine interaction communication interface (manual command receives and the state information transmission interface), CPU and performance element (being the control loop of controlled rectifier 30 or controlled inverter 31).
CPU is the high-performance microcontroller system, it is according to the relevant parameters such as ambient temperature and humidity, conductor temperature, wire icing thickness and lead operating current that collect, trigger the wire-protecting and de-icing task and generate the wire-protecting and de-icing current parameters by the wire-protecting and de-icing calculation procedure that solidifies, and convert this wire-protecting and de-icing current parameters the corresponding control signal of controlled rectifier 30 and controlled inverter 31 to, make the wire-protecting and de-icing power supply export corresponding wire-protecting and de-icing power supply.
The wire-protecting and de-icing current control system is equipped with the man-machine interaction communication interface, device parameter and operating state can be handed down to maintenance terminal, also can receive the control command that manually issues, and realizes the Artificial Control of wire-protecting and de-icing device.
The important parameter of wire-protecting and de-icing device can on-the-spotly be provided with, to adapt to the needs of local meteorological condition and different conductor parameter.
Claims (6)
1. a wire-protecting and de-icing method of unit type high tension power line is characterized in that, comprises the steps:
A, the certain section homophase bundle conductor of definition (11,12) are the wire-protecting and de-icing unit, adopt conducting interval rod (90) in this unit end positions;
B, wire-protecting and de-icing device (100) is set in described unit, this wire-protecting and de-icing device (100) utilizes the operating current conversion on the bundle conductor (11,12) to produce the wire-protecting and de-icing electric current, and this wire-protecting and de-icing electric current forms loop and produces heat between described two conducting interval rods (90) and bundle conductor (11,12) realizes wire-protecting and de-icing.
2. wire-protecting and de-icing method of unit type high tension power line according to claim 1 is characterized in that: described wire-protecting and de-icing device (100) comprises wire-protecting and de-icing power supply and wire-protecting and de-icing current control system.
3. wire-protecting and de-icing method of unit type high tension power line according to claim 2 is characterized in that: direct current mode or exchange way are adopted in the wire-protecting and de-icing power supply output of described wire-protecting and de-icing device (100):
When the direct current mode is adopted in the output of wire-protecting and de-icing power supply, its main circuit topology is made up of transducing current transformer (20) and controlled rectifier (30), described transducing current transformer (20) primary side is series in the bundle conductor (11,12), secondary side connects controlled rectifier (30) AC side, controlled rectifier (30) DC side connects filter capacitor (4), and filter capacitor (4) two ends are the output of wire-protecting and de-icing electric current;
When exchange way is adopted in the output of wire-protecting and de-icing power supply, its main circuit topology is by transducing current transformer (20), controlled rectifier (30), controlled inverter (31) and isolated converters (21) are formed, described transducing current transformer (20) is formed rectification circuit with controlled rectifier (30), described controlled inverter (31) is formed inverter circuit with isolated converters (21), the DC side of rectification circuit and inverter circuit is all in parallel with filter capacitor (4), described rectification circuit is responded to described bundle conductor (11,12) alternating current on also partly or entirely is rectified into direct current, described inverter circuit this direct current is reverse into alternating current again and by isolated converters (21) output, promptly the secondary side of isolated converters (21) is the output of wire-protecting and de-icing electric current.
4. wire-protecting and de-icing method of unit type high tension power line according to claim 3 is characterized in that: the main power device of controlled rectifier (30) and controlled inverter (31) adopts controlled power electronic device in the described wire-protecting and de-icing power supply; When described wire-protecting and de-icing electric power outputting current was zero, transducing current transformer (20) secondary side equivalence was in short-circuit condition, and the electric parameter equivalence of bundle conductor (11,12) is in the conventional operation state; The wire-protecting and de-icing electric current adopts from the null value startup and delays and rises the slow control method that falls, and avoids the impact of big current break to lead.
5. according to each described wire-protecting and de-icing method of unit type high tension power line of claim 2 to 4, it is characterized in that: the wire-protecting and de-icing current control system is gathered ambient temperature and humidity, conductor temperature, ice covering thickness and current in wire information, according to being solidificated in intrasystem procedure triggers wire-protecting and de-icing task, calculating the wire-protecting and de-icing size of current, and generate the control signal of corresponding controlled rectifier (30), controlled inverter (31); System also possesses manual command and receives and the status information of equipment sending function.
6. wire-protecting and de-icing method of unit type high tension power line according to claim 1, it is characterized in that: described wire-protecting and de-icing device (100) is installed near the insulator string (9), interior dress fan disperses self-radiating, and institute's heat dissipation capacity is used for the icing protection of insulator string (9).
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| CN2008100665404A CN101272041B (en) | 2008-04-14 | 2008-04-14 | Wire-protecting and de-icing method of unit type high tension power line |
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| CN2008100665404A CN101272041B (en) | 2008-04-14 | 2008-04-14 | Wire-protecting and de-icing method of unit type high tension power line |
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| CN101272041B true CN101272041B (en) | 2010-10-27 |
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| CN113346437A (en) * | 2021-05-31 | 2021-09-03 | 国家电网有限公司 | Current divider for current circulation ice melting of multi-bundle conductor |
| CN113346438A (en) * | 2021-05-31 | 2021-09-03 | 国家电网有限公司 | Split conductor current circulation intelligent ice melting control system |
| CN113889957B (en) * | 2021-09-26 | 2023-06-16 | 武汉理工大学 | Non-contact coupling type ice melting topology and ice melting method based on distributed power flow control |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB850612A (en) * | 1957-11-12 | 1960-10-05 | British Insulated Callenders | Improvements in or relating to prevention of ice formation of high voltage overhead transmission lines |
| CN200944519Y (en) * | 2006-08-29 | 2007-09-05 | 薛辉 | Automatic ice-melting device for transmission line |
-
2008
- 2008-04-14 CN CN2008100665404A patent/CN101272041B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB850612A (en) * | 1957-11-12 | 1960-10-05 | British Insulated Callenders | Improvements in or relating to prevention of ice formation of high voltage overhead transmission lines |
| CN200944519Y (en) * | 2006-08-29 | 2007-09-05 | 薛辉 | Automatic ice-melting device for transmission line |
Non-Patent Citations (2)
| Title |
|---|
| JP平9-37448A 1997.02.07 |
| JP昭60-216711A 1985.10.30 |
Also Published As
| Publication number | Publication date |
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| CN101272041A (en) | 2008-09-24 |
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