CN113624272A - Icing early warning, anti-icing and ice melting method for contact network of alternating current electrified railway - Google Patents
Icing early warning, anti-icing and ice melting method for contact network of alternating current electrified railway Download PDFInfo
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Abstract
An icing early warning, anti-icing and ice melting method for an AC electrified railway contact network adopts a plurality of contact network substation data acquisition modules along the line, a reactor, an isolating switch, a data receiving and analyzing module and a control module as an early warning system; the substation data acquisition module comprises a wireless signal transmitting assembly, a temperature sensor, a humidity sensor, a wind speed sensor, a wind direction sensor, a rainfall sensor and an illumination intensity sensor; reactor, industrial computer, isolator, power supply arm electric connection respectively, control module can be based on its inside algorithm function, can calculate the impedance value size that the regulation reactor need drop into, and then control gets into the anti-icing current size of reactor power input end, reaches the contact net anti-icing effect. The invention replaces ice melting with ice prevention, has small required current, small influence on the safety of the contact network, is more economical aiming at the accidental ice coating event, can calculate the optimal ice prevention current according to the working condition, can avoid the local overheating of the contact network and influence on the structure, and can reduce the energy consumption cost.
Description
Technical Field
The invention relates to the technical field of an anti-icing and de-icing application method of an alternating current electrified railway traction power supply system, in particular to an icing early warning and anti-icing and de-icing method of an alternating current electrified railway catenary.
Background
An electrified railway contact network is a transmission line which is erected along a railway and is provided with electric locomotives to provide electric energy. When the contact net freezes, the mechanical and electrical properties can be reduced, the current collection of the electric locomotive is influenced, the arcing phenomenon is generated, and the contact line and the pantograph slide plate are ablated. In severe cases, the contact net collapses, the pantograph slide plate is broken, and the normal operation of the railway is seriously influenced. Therefore, some measures are necessary to prevent and eliminate the icing of the contact net.
At present, the methods for preventing and melting ice in the railway system mainly comprise 3 methods: thermodynamic de-icing, mechanical de-icing and passive chemical anti-icing. The thermodynamics ice melting is to melt ice coated on a contact net by using heat energy, such as the Chinese patent No. CN 103247991B and the patent name 'a method for realizing ice prevention and ice melting by using interphase short circuit for the contact net of an electrified railway', wherein the two different phase windings for supplying power to an upper contact net and a lower contact net are in short circuit to form an interphase short circuit, so that short circuit current flows through the contact net to realize self-heating of the contact net, thereby achieving the purpose of ice melting; the short-circuit current of the scheme only depends on the length of the power supply arm and cannot be controlled (in the mode, the loop current is the ratio of the circuit voltage to the impedance of the overhead line system, the circuit voltage is the voltage of the traction transformer, the impedance of the overhead line system depends on the length of the power supply arm, and the impedance of the overhead line system is a fixed value for a certain line, so that the energy consumption defect exists). In a plurality of patents of the national patent number 'CN 102616152B, CN 102832582B, CN 102195260B, CN 103326301B', the technical scheme is that inductive and capacitive reactive power sources of power electronic devices are arranged at the head end and the tail end of a contact net, the contact net is heated by utilizing reactive current to realize the purposes of ice prevention and ice melting, and the dynamic balance and reactive power compensation of a system can be realized by adjusting the capacitive and inductive reactive power sources; although the scheme can realize online heating of the contact network, the defects of high cost and poor maintainability and reliability exist. According to the patent of the national patent number 'CN 103490645A, CN 102638019A', an additional direct current source is utilized to provide direct current for a contact net to melt ice, and the scheme needs to be additionally provided with a set of inverter equipment, so that the defect of high cost exists.
At present, foreign countries have a way of heating contact wires by using an additional resistance wire: the Japan Hitachi company utilizes a contact wire with a built-in insulated resistance wire to heat a contact net, and an Italian railway adds an extra resistance wire to the contact wire to heat the contact wire. The extra resistance wire needs to be laid on the existing contact net, and an extra set of power supply is needed, so that the scheme cost is high. In addition, the resistance wire only heats the contact line, so that temperature difference exists between the carrier cable and the contact line, ice coating of the compensation device cannot be melted, and the contact suspension performance can be obviously reduced.
Mechanical de-icing primarily utilizes external forces to peel ice from the contact web. The manual ice-making is mainly adopted at home, and an ice-making appliance or a pantograph is used for deicing the contact net wire, so that the defects of low efficiency and high labor cost exist, and the contact net is easily damaged externally. Passive chemical anti-icing is a means for spraying chemical agents on the surface of an object to realize ice melting and anti-freezing; some railways in Germany and Switzerland adopt the method, but no application case of spraying the antifreezing agent on the contact net exists in China; and the chemical anti-icing has short effective period and needs to be coated regularly. In addition, the environmental impact of chemical agents is also a considerable concern. In summary, the above 3 ice melting methods have the following disadvantages: the electric ice melting mode is characterized in that the specific resistance of a contact net is low, the contact net can be subjected to self-heating ice melting only by passing a large current, local overheating can be caused under the condition of the large current, the contact net is a large-tension system, the mechanical performance of the material is reduced due to the local overheating, the structure safety is influenced, the mechanical ice melting mode is low in efficiency, external force damage can be caused to the contact net, the chemical ice-proof mode is short in time-validity period, and the environmental influence is large.
Disclosure of Invention
In order to overcome the defects of thermodynamics ice melting, mechanical deicing and passive chemical ice prevention caused by the technical limitation in the prior art, as described in the background art, the invention provides a method for monitoring microclimate information of key areas along a railway by arranging an adjustable reactor in a railway traction substation under the combined action of related structures, arranging a small meteorological station along the railway to monitor the microclimate information, combining the on-line microclimate monitoring information to realize the early warning of ice coating of a contact network, calculating the optimal ice prevention current on the same power supply arm by integrating the environmental conditions of each monitoring point after the early warning, connecting the adjustable reactor in different phase power supplies of the traction substation according to the ice prevention current value, providing the power supply for the ice prevention current on the power supply arm by utilizing the phase-to-phase voltage difference of the different phase power supplies, achieving the aim of ice prevention, thereby realizing no influence on the mechanical performance and structural safety of the contact network, no external force damage to the contact network, the method for pre-warning icing, preventing icing and melting ice of the AC electrified railway contact net has the advantages of no environmental influence and good effects of preventing icing and removing ice.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the method for pre-warning icing, preventing icing and melting ice of the contact network of the alternating-current electrified railway is characterized in that a plurality of contact network substation data acquisition modules along the contact network, a reactor, an isolating switch, a data receiving and analyzing module and a control module are used as a pre-warning system; the control module and the data receiving and analyzing module are application software installed in an industrial personal computer in the traction substation; the substation data acquisition module comprises a wireless signal transmitting assembly, a temperature sensor, a humidity sensor, a wind speed sensor, a wind direction sensor, a rainfall sensor and an illumination intensity sensor; the six signal input ends of the temperature sensor, the humidity sensor, the wind speed sensor, the wind direction sensor, the rainfall sensor, the illumination intensity sensor and the wireless signal transmitting assembly are respectively and electrically connected; the power supply input end of the reactor is electrically connected with the control power supply output end of the industrial personal computer, the power supply output end of the reactor is electrically connected with the power supply input end of the isolating switch, and the power supply output end of the isolating switch is electrically connected with the power transmission line in the traction substation and connected with the uplink and downlink contact networks of the adjacent power supply arms of the traction substation respectively; the data receiving and analyzing module can receive temperature, humidity, wind speed, wind direction, illumination intensity and rainfall data sent by the temperature sensor, the humidity sensor, the wind speed sensor, the wind direction sensor, the rainfall sensor and the illumination intensity sensor through the wireless signal transmitting assembly; the data receiving and analyzing module predicts icing conditions of a contact net by combining the uploaded temperature, humidity, wind speed, wind direction, illumination intensity, rainfall data and public network meteorological information detected by the substation through a built-in algorithm and outputs all data to the control module, and after the data receiving and analyzing module sends out an icing early warning, the control module can adjust the reactor to output anti-icing current; the control module can calculate and adjust the magnitude of the impedance value required to be input by the reactor based on the internal algorithm function of the control module, so as to control the magnitude of the anti-icing current entering the power supply input end of the reactor and achieve the anti-icing effect of a contact network; the control module anti-icing current magnitude calculation formula is
Furthermore, the data receiving and analyzing module can also store past temperature, humidity, wind speed, wind direction, illumination intensity and rainfall monitoring data, can realize calling and checking functions, and assists in perfecting a prediction algorithm.
Furthermore, a temperature sensor, a humidity sensor, a wind speed sensor, a wind direction sensor, a rainfall sensor and an illumination intensity sensor of the substation are arranged at positions near an air port, a bealock, a water source and a mountain windward side along a railway line.
Furthermore, the temperature sensor can acquire field temperature data, the humidity sensor can acquire field humidity data, the wind speed sensor can acquire field wind speed data, the wind direction sensor can acquire field wind direction data, the rainfall sensor can acquire field rainfall data, and the illumination intensity sensor can acquire field illumination intensity data, and the data are transmitted through the wireless signal transmitting assembly.
The invention has the beneficial effects that: the invention sets an adjustable reactor which can be intelligently adjusted by a control module in a traction substation, small meteorological stations (including a temperature sensor, a humidity sensor, a wind speed sensor, a wind direction sensor, a rainfall sensor, an illumination intensity sensor and the like) are erected on a contact network along a line to monitor microclimate information of key areas along the line, early warning of contact network icing is realized by combining online public network microclimate monitoring information, environmental conditions of monitoring points are integrated after early warning, optimal anti-icing current on the same power supply arm is calculated by the control module, the control module regulates the output current of the adjustable reactor according to the required anti-icing current value and then connects the regulated output current into different phase power supplies of the traction substation, and the power supply is provided for the anti-icing current on the power supply arm by using the phase-to-phase voltage difference of the different phase power supplies, so that the anti-icing purpose is achieved. The invention replaces the ice melting in the past scheme with the ice prevention, the required current is small, and the safety influence on the contact network is small; the adjustable reactor is used for limiting reactive current, the equipment structure is simple and reliable, the defects of frequent maintenance and high cost of power electronic equipment adopted by the conventional scheme are overcome, and the equipment is more economical for accidental icing events; the microclimate monitoring system is arranged according to the line condition, and parameters such as environment temperature, humidity, wind speed and direction, precipitation and the like are provided for the decision-making system, so that on one hand, icing early warning can be performed, on the other hand, the optimal anti-icing current can be calculated according to the working conditions, the local overheating of a contact network can be avoided, the structure safety is not influenced, and the energy consumption cost can be reduced; the invention mainly utilizes the existing substation equipment, only adds 1 adjustable reactor and the matched isolating switch in the substation, and has less investment; if reverse charging is carried out by traction power transformation or a reactive compensation device is matched, the anti-icing current energy consumption is low and the cost is saved. Based on the above, the invention has good application prospect.
Drawings
Fig. 1 is a schematic diagram of a single wire system configuration of the present invention.
Fig. 2 is a schematic diagram of a complex line system.
Fig. 3 is a schematic diagram of a single wire line connection.
Fig. 4 is a schematic diagram of the multi-line wiring method 1.
Fig. 5 is a schematic diagram of the multi-line wiring system 2.
FIG. 6 is a schematic diagram of a multi-line circuit configuration.
Fig. 7 and 8 are schematic diagrams showing the situation that the power supply arm 1 is iced and the power supply arm 2 is not iced.
Detailed Description
As shown in fig. 1, 2, 3, 4, 5, 6, 7 and 8, in the method for pre-warning ice coating, anti-icing and ice melting of an overhead contact system of an alternating-current electrified railway, a plurality of data acquisition modules, reactors, isolating switches, data receiving and analyzing modules and control modules of substations along the overhead contact system are adopted as a pre-warning system; the control module and the data receiving and analyzing module are application software installed in an industrial personal computer in the traction substation; the substation data acquisition module comprises a wireless signal transmitting assembly, a temperature sensor, a humidity sensor, a wind speed sensor, a wind direction sensor, a rainfall sensor and an illumination intensity sensor; six signal input ends of the temperature sensor, the humidity sensor, the wind speed sensor, the wind direction sensor, the rainfall sensor, the illumination intensity sensor and the wireless signal transmitting assembly are respectively connected through leads; the power supply input end of the reactor is connected with the control power supply output end of the industrial personal computer through a wire, the power supply output end of the reactor is connected with the power supply input end of the isolating switch through a wire, and the power supply output end of the isolating switch is connected with a power transmission line in the traction substation and connected with an uplink and downlink contact network of an adjacent power supply arm of the traction substation through a wire; the data receiving and analyzing module can receive temperature, humidity, wind speed, wind direction, illumination intensity and rainfall data sent by the temperature sensor, the humidity sensor, the wind speed sensor, the wind direction sensor, the rainfall sensor and the illumination intensity sensor through the wireless signal transmitting assembly; the data receiving and analyzing module can predict the icing condition of the contact network by combining the uploaded temperature, humidity, wind speed, wind direction, illumination intensity, rainfall data and public network meteorological information detected by the substation through a built-in algorithm, and outputs all data to the control module, and after the data receiving and analyzing module sends out an icing early warning, the control module can adjust the reactor to output anti-icing current; the control module can calculate and adjust the magnitude of the impedance value required to be input by the reactor based on the internal algorithm function of the control module, so as to control the magnitude of the anti-icing current entering the power supply input end of the reactor and achieve the anti-icing effect of the heating contact net; the control module anti-icing current magnitude calculation formula is
For rime is
v-wind speed, unit m/s. The temperature of other monitoring points under the anti-icing current can be verified through a thermodynamic equilibrium relationship, and the following requirements are met:
in the formula, Ws is the solar heating power; WR-radiant heat dissipation power; WF-convective heat dissipation power;
in the formula, E1 is the radiation heat dissipation coefficient of the surface of the lead, and the bright new line is 0.23-0.43; the used wire or the wire coated with the black preservative is 0.90-0.95 percent; S1-Stefan-Boltzmann constant, 5.67X 10-8, W/(m)2K4) (ii) a Tlimit-the temperature rise allowed by the wire, inoC; ta-ambient temperature inoC; flow heat dissipation power WF:
in the formula (I), wherein,
-the heat transfer coefficient of the air layer on the surface of the wire is W/(m)oC)，
(ii) a Re-Reynolds number.
(wherein v is vertical wire wind speed, m/s;
-kinematic viscosity of air layer on surface of wire, m2/s，
) Solar heat absorption power WS:
in the formula, as is the heat absorption coefficient of the surface of the wire, and the bright new line is 0.35-0.46; the old line or the black line is 0.9-0.95, and in the test, Js is the sunlight intensity of sunlight on the wire, W/m 2; when the wire is directly irradiated in sunny days and sunshine, 1000W/m can be adopted2. Calculation conditions 90 in GB 50545-2010oC, radiation coefficient of 0.9, absorption coefficient of 0.9, and sunshine intensity of 0.1W/cm2. Tlimit is typically 70oC. Through the above, the anti-icing current meets the anti-icing requirement of the worst environment point, and simultaneously also meets the condition that the temperature rise of each part of the contact net is not more than 70oAnd C, requirement. The calculation formula of the impedance value required to be input by the reactor is
Where ZD is the reactor impedance; zx-line impedance.
As shown in fig. 1, 2, 3, 4, 5, 6, 7 and 8, the data receiving and analyzing module can also store past temperature, humidity, wind speed, wind direction, illumination intensity and rainfall monitoring data, and can realize functions of calling and checking and assist in perfecting a prediction algorithm. The temperature sensor, the humidity sensor, the wind speed sensor, the wind direction sensor, the rainfall sensor and the illumination intensity sensor of the substation are arranged at positions near an air port, a bealock, a water source and a mountain windward side along a railway line. The temperature sensor can collect on-site temperature data, the humidity sensor can collect on-site humidity data, the wind speed sensor can collect on-site wind speed data, the wind direction sensor can collect on-site wind direction data, the rainfall sensor can collect on-site rainfall data, and the illumination intensity sensor can collect on-site illumination intensity data, and the data are sent through the wireless signal sending assembly.
As shown in fig. 1, 2, 3, 4, 5, 6, 7 and 8, when the present invention is applied to a single line of an electrified railway, a current path can be established by communicating two adjacent power supply arms; at this time, the difference of the power voltages of different phase sequences of adjacent traction substations supplies power for the anti-icing circuit. When the anti-icing circuit is applied to a complex line of an electrified railway, a current path can be constructed by communicating adjacent power supply arms, the upper line and the lower line can be communicated in a contact manner in a subarea place along the railway, and the power supply of the anti-icing circuit is supplied by using the phase voltage between different phase power supplies of the same traction substation. The small icing early warning weather station formed by the temperature sensor, the humidity sensor, the wind speed sensor, the wind direction sensor, the rainfall sensor, the illumination intensity sensor, the wireless signal sending assembly and the like needs to be arranged in different sections with different environmental influences such as wide areas, bridges and culverts, tunnels and the like along the line, the calculation influence on the optimal anti-icing current is obvious, wherein the influence of the wind speed and the environmental temperature on the anti-icing current is the most obvious, the influence of the anti-icing time on the anti-icing current is not obvious, the optimal anti-icing current needs to control the temperature rise of each part within an allowable range, and the anti-icing current passed by the contact network is the best within the range of 200-700A through calculation. The invention is suitable for the traction substation with the phase-to-phase angle of different phase power supplies of 60o、90oAnd 120oAccording to the scheme, the phase angle between phases of the power supply depends on the wiring of the traction transformer, the reactance adjustment range of the reactor needs to be determined according to the actual wiring condition of the traction substation, the length of a power supply arm interval and the anti-icing current value, the resistance value suggestion range of the reactor is 3-50 omega through calculation, the reactor with smaller resistance value can be adopted, and the current on a contact net is increased to realize the ice melting function.
As shown in fig. 1, 2, 3, 4, 5, 6, 7, and 8, the ice coating condition is a proper temperature and sufficient moisture according to the related research results. The invention sets adjustable reactors which can be intelligently adjusted by a control module in a traction substation, small meteorological stations (comprising a temperature sensor, a humidity sensor, a wind speed sensor, a wind direction sensor, a rainfall sensor, an illumination intensity sensor and the like) are erected along a contact network to monitor microclimate information of key areas along the line, early warning of contact network icing is realized by combining the online public network microclimate monitoring information, the small meteorological stations are arranged along a railway to monitor parameters such as microclimate environment temperature, humidity, wind speed, wind direction and the like, the probability of the contact network icing in a local small environment is judged, when the probability of the contact network icing is judged, the invention starts an anti-icing function, and after early warning, the environmental conditions of each monitoring point are synthesized, the optimal anti-icing current on the same power supply arm is calculated by the control module, and the control module calculates the anti-icing current value according to the requirement, the output current of the adjustable reactor is regulated and then is connected in series between different phase power supplies of the traction substation, and the phase voltage difference of the different phase power supplies is utilized to provide power for the anti-icing current on the power supply arm, so that the aims of heating the power supply arm to prevent icing and saving electricity are fulfilled. In order to avoid the contact net icing, the contact net icing prevention method is realized by weakening the adhesion force at the junction of the icing and the surface of the lead or preventing supercooled water drops from freezing on the surface of the lead, the temperature of the surface of the lead is increased by passing current in the lead and utilizing the joule heat of the lead per se to form a water film, and then the icing can be effectively prevented. According to the anti-icing system, 1 adjustable reactor is arranged in a traction substation mainly by means of reactive power of the reactor to limit reactive current, the adjustable reactor is connected in series between different phase power supplies of the traction substation by a control module according to ice coating early warning information of a data analysis module, so that the contact network is supplied with anti-icing current with a fixed value (a current loop is formed by an uplink contact network and a downlink contact network on a continuous power supply arm or the same power supply arm according to the line condition, and the current does not flow through a steel rail and the ground), and a good anti-icing effect is achieved. The invention replaces the ice melting in the past scheme with the ice prevention, the required current is small, and the safety influence on the contact network is small; the adjustable reactor is used for limiting reactive current, the equipment structure is simple and reliable, the defects of frequent maintenance and high cost of power electronic equipment adopted by the conventional scheme are overcome, and the equipment is more economical for accidental icing events; the microclimate monitoring system is arranged according to the line condition, and parameters such as environment temperature, humidity, wind speed and direction, precipitation and the like are provided for the decision-making system, so that on one hand, icing early warning can be performed, on the other hand, the optimal anti-icing current can be calculated according to the working conditions, the local overheating of a contact network can be avoided, the structure safety is not influenced, and the energy consumption cost can be reduced; the existing substation equipment is mainly utilized, only 1 adjustable reactor and a matched isolating switch thereof are added in the substation, and the investment is low; if reverse charging is carried out by traction power transformation or a reactive compensation device is matched, the anti-icing current energy consumption is low and the cost is saved. Based on the above, the invention has good application prospect.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, the embodiments do not include only one independent technical solution, and such description is only for clarity, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims (4)
1. The method for pre-warning icing, preventing icing and melting ice of the contact network of the alternating-current electrified railway is characterized in that a plurality of contact network substation data acquisition modules along the contact network, a reactor, an isolating switch, a data receiving and analyzing module and a control module are used as a pre-warning system; the control module and the data receiving and analyzing module are application software installed in an industrial personal computer in the traction substation; the substation data acquisition module comprises a wireless signal transmitting assembly, a temperature sensor, a humidity sensor, a wind speed sensor, a wind direction sensor, a rainfall sensor and an illumination intensity sensor; the temperature sensor, the humidity sensor, the wind speed sensor, the wind direction sensor, the rainfall sensor, the illumination intensity sensor and the multi-channel signal input end of the wireless signal transmitting assembly are respectively and electrically connected; the power supply input end of the reactor is electrically connected with the control power supply output end of the industrial personal computer, the power supply output end of the reactor is electrically connected with the power supply input end of the isolating switch, and the power supply output end of the isolating switch is electrically connected with the power transmission line in the traction substation and connected with the uplink and downlink contact networks of the adjacent power supply arms of the traction substation respectively; the data receiving and analyzing module can receive temperature, humidity, wind speed, wind direction, illumination intensity and rainfall data sent by the temperature sensor, the humidity sensor, the wind speed sensor, the wind direction sensor, the rainfall sensor and the illumination intensity sensor through the wireless signal transmitting assembly; the data receiving and analyzing module can predict the icing condition of the contact network by combining the uploaded temperature, humidity, wind speed, wind direction, illumination intensity, rainfall data and public network meteorological information detected by the substation through a built-in algorithm and outputting all the data to the control module; the control module can calculate and adjust the magnitude of the impedance value required to be input by the reactor based on the internal algorithm function of the control module, so as to control the magnitude of the anti-icing current entering the power supply input end of the reactor and achieve the anti-icing effect of a contact network; the control module anti-icing current magnitude calculation formula is
(ii) a The calculation formula of the impedance value required to be input by the reactor is
。
2. The icing early warning and anti-icing and de-icing method for the AC electrified railway catenary, according to claim 1, wherein the data receiving and analyzing module is further capable of storing past temperature, humidity, wind speed, wind direction, illumination intensity and rainfall monitoring data, and can realize calling and checking functions and assist in perfecting a prediction algorithm.
3. The icing early warning and anti-icing and ice-melting method for the AC electrified railway catenary, according to claim 1, characterized in that the temperature sensor, the humidity sensor, the wind speed sensor, the wind direction sensor, the rainfall sensor and the illumination intensity sensor of the substation are arranged at positions near an air port, a bealock and a water source along a railway line and near a mountain windward side.
4. The method for pre-warning icing, preventing icing and melting ice of the AC electrified railway catenary, according to claim 1, wherein the temperature sensor can acquire field temperature data, the humidity sensor can acquire field humidity data, the wind speed sensor can acquire field wind speed data, the wind direction sensor can acquire field wind direction data, the rainfall sensor can acquire field rainfall data, and the illumination intensity sensor can acquire field illumination intensity data, and the data are transmitted through the wireless signal transmitting assembly.
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| CN202110759601.0A CN113624272A (en) | 2021-07-06 | 2021-07-06 | Icing early warning, anti-icing and ice melting method for contact network of alternating current electrified railway |
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| CN202110759601.0A CN113624272A (en) | 2021-07-06 | 2021-07-06 | Icing early warning, anti-icing and ice melting method for contact network of alternating current electrified railway |
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| CN110132350A (en) * | 2019-05-08 | 2019-08-16 | 三峡大学 | Floated overhead transmission line on-line monitoring system and method |
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| CN102353400A (en) * | 2011-07-18 | 2012-02-15 | 航天科工深圳（集团）有限公司 | Method and system for monitoring icing condition of overhead power transmission line |
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