CN113541036A - Real-time monitoring OPGW optical cable direct current ice melting system - Google Patents
Real-time monitoring OPGW optical cable direct current ice melting system Download PDFInfo
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- CN113541036A CN113541036A CN202110585302.XA CN202110585302A CN113541036A CN 113541036 A CN113541036 A CN 113541036A CN 202110585302 A CN202110585302 A CN 202110585302A CN 113541036 A CN113541036 A CN 113541036A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/128—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment involving the use of Internet protocol
Abstract
The invention discloses a real-time monitoring OPGW optical cable direct current ice melting system, wherein a power transmission line is erected in a same tower and double loops, an ice melting loop is constructed in a single-loop power failure ice melting mode and a double-loop power failure ice melting mode, and an overall process monitoring system is further arranged for monitoring ice covering and ice melting conditions in real time. According to the technical scheme, the ice melting of the OPGW optical cable is realized in a direct-current ice melting mode, the accurate ice melting system monitors the states of the temperature of an inner core of the optical cable, the temperature of the surface of the optical cable and the like in real time by means of the whole-process monitoring system, the ice melting current and the temperature of the optical core can be controlled and controlled, and the safety of the optical cable is effectively protected. Therefore, the power grid loss caused by ice coating of the OPGW optical cable is avoided, the capability of the line for coping with extreme weather such as rain, snow, ice and the like is effectively improved, and the operation reliability of the line is improved.
Description
Technical Field
The invention belongs to the technical field of power transmission engineering, and particularly relates to an icing and deicing technology of a power transmission line.
Background
In the Taizhou region, a large number of mountain high-altitude power transmission lines exist due to the geomorphic characteristics of 'seven mountains, two rivers and one farmland'. Meanwhile, Taizhou is in the southeast coastal region, and the cold and damp condition in winter creates extremely favorable conditions for the generation of ice coating on the line. The icing of the transmission line can cause serious damage to the transmission line, and the method mainly comprises the following steps:
1. the ice coating of the line can cause the rapid increase of vertical load, so that tower and hardware are overwhelmed to cause vicious accidents such as tower falling, line breakage and the like;
2. the circuit icing can increase the sag, and the slight waving easily causes interphase short circuit and tripping;
3. uneven icing or different-period deicing can cause conductor galloping under the action of specific wind power, light people generate flashover and tripping, heavy people cause hardware fittings and cross arms to deform, and towers fall down and break.
Therefore, the research and discussion of the ice melting technology undoubtedly have very important significance for solving the ice coating problem of the transmission line in the high-humidity and high-altitude areas.
At present, the ice melting mode generally adopted is to short-circuit a three-phase wire by a circuit which is shut down, and apply direct current to the circuit at two ends of the circuit by using a fixed or movable ice melting device to form a loop, so that the circuit generates heat and melts ice. The mode has a good ice melting effect on the wire, and can not realize ice melting on the ground wire or the optical cable easily for the following reasons:
the ground wire or the optical cable is not insulated from the tower in a whole line, and a loop cannot be formed by applying direct current at two ends of the line, so that the tower cannot be heated and melted by applying the direct current.
And secondly, the electric conductivity of the ground wire or the optical cable is much lower than that of the lead, the loss caused in the ice melting process is large, and the ice melting effect is not ideal.
And thirdly, the optical fiber in the optical cable is sensitive to temperature, the heating temperature cannot be accurately controlled in the ice melting process, and the optical fiber is easily damaged when the heating temperature is too high, so that the optical path is interrupted.
In practical research, the ground wire and the optical cable are found to be more prone to icing and wire breakage accidents in rainy, snowy and frozen weather due to the characteristics that the ground wire and the optical cable are smaller in wire diameter and do not flow through in a normal state. Therefore, how to research an accurate ice melting technology for the ground wire and the optical cable is a big problem which puzzles many electric power practitioners at present.
In addition, in the ice melting process, the surface temperature, the optical core temperature and the ice coating state of the OPGW optical cable need to be monitored in an omnibearing and visual manner.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the real-time monitoring OPGW optical cable direct current ice melting system which can monitor the ice coating and ice melting processes in real time, realize accurate ice melting and avoid the occurrence of line breaking accidents caused by ice coating in rainy, snowy and frozen weather.
In order to solve the technical problems, the invention adopts the following technical scheme:
a real-time monitoring OPGW optical cable DC ice melting system, the transmission line adopts the same tower double-circuit erection, adopts the two modes of single circuit power failure ice melting and double circuit power failure ice melting to construct an ice melting loop,
an insulation structure is arranged between the OPGW optical cable and the transmission line tower;
the single-loop power failure ice melting adopts a single-side optical cable ice melting wiring mode, and a fixed ice melting device, an upper phase conductor of the power transmission line, an OPGW optical cable and a middle phase conductor of the power transmission line are connected to form a direct current ice melting through-flow loop;
the double-circuit power failure ice melting adopts a wiring mode of double-side optical cables for ice melting at the same time, and a fixed ice melting device, an upper phase conductor on one side of the power transmission line, an OPGW optical cable on one side, an opposite side OPGW optical cable and an upper phase conductor on the opposite side of the power transmission line are connected to form a direct-current ice melting through-flow loop;
the system is also provided with an overall process monitoring system for monitoring the icing and ice melting conditions in real time, and the overall process monitoring system comprises:
microclimate on-line monitoring device: the microclimate online monitoring device is used for monitoring the meteorological environment of the place where the power transmission line is located and transmitting the collected meteorological environment parameters to the monitoring host through the network;
lead ground wire temperature measurement on-line monitoring device: the ground wire temperature measurement online monitoring is used for sensing and automatically collecting the surface temperature of a lead and an OPGW optical cable, and transmitting the collected temperature parameters to a monitoring host through a network;
icing on-line monitoring device: the ice coating on-line monitoring device is used for monitoring the ice coating condition of the power transmission line, and transmitting the ice coating condition of the power transmission line to the monitoring host computer in real time through a network;
wear fog type video on-line monitoring device: the fog penetrating type video online monitoring device is used for shooting and returning the icing state of the lead and the OPGW optical cable and the actual ice melting and ice removing processes of the lead and the OPGW optical cable, and transmitting the video to the monitoring host computer in real time through a network;
monitoring the host computer: the monitoring host is in communication connection with the microclimate online monitoring device, the ground wire temperature measurement online monitoring device, the ice coating online monitoring device and the fog penetrating type video online monitoring device.
Preferably, for the tangent tower, the OPGW optical cable is fixed by adopting the suspension insulator string, the ground wire of the OPGW optical cable is grounded base by base, and a ground wire discharge gap is arranged.
Preferably, for the strain tower, the tail end of the OPGW is insulated from the tower body of the tower through a strain insulator string, and the ground wire of the OPGW optical cable is provided with a ground wire discharge gap.
Preferably, a tension tower is adopted at the optical cable section, and the whole line of the lower part of the OPGW optical cable is led down from the outside of the tower body by adopting a supporting insulator to keep a safe distance with the tower body.
Preferably, the two sections of OPGW optical cables are connected through an optical cable junction box, the optical cable junction box adopts an OPGW isolation type insulation junction box to achieve the purpose of photoelectric separation of the optical cables, and the rest optical cables are fixed on a post insulator to be insulated with a tower body of a tower.
Preferably, the meteorological environment parameters include temperature, humidity, wind direction, wind speed and air pressure parameters, and the collected various meteorological parameters and the variation conditions thereof are transmitted to the system host computer in real time through a network.
Preferably, the ice coating on-line monitoring device comprises an ice coating tension sensor, the ice coating tension sensor is additionally arranged on the suspension string of the power transmission line, and ice melting operation is required if the tension value monitored by the ice coating tension sensor is higher than a set normal value.
Preferably, the temperature of the inner core of the OPGW optical cable is controlled within 65 ℃, and the short-time limit temperature of the OPGW optical cable does not exceed 80 ℃.
Preferably, the direct-current ice melting current is controlled to control the temperature of the inner core of the optical cable.
Preferably, a temperature monitoring device is arranged at the lap joint point of the drainage wire and the optical cable, and a temperature monitoring device is arranged at the cable outlet point of the tower head optical cable.
According to the technical scheme, the ice melting of the OPGW optical cable is realized in a direct current ice melting mode, the fixed ice melting device is used as direct current output, and a through-current loop is formed by connecting a lead and the OPGW optical cable in series, so that the direct current ice melting function is realized.
The system is characterized in that a digital ice coating overall process monitoring system is formed based on microclimate online monitoring, ground wire temperature measurement online monitoring, ice coating online monitoring, fog penetrating type video online monitoring and background early warning systems, the states of the front and the back of line ice coating are mastered through omnibearing and visual monitoring of the surface temperature, the optical core temperature and the ice coating state of an OPGW optical cable, and the functions of ice coating early warning, ice coating state data returning, ice melting process data returning, ice removing state control, ice removing decision assisting and the like are achieved, the overall process of ice coating, ice melting and ice removing is completed before line ice coating, and strong data support is provided for overall work deployment such as prevention, inspection and ice removing operation.
The precise ice melting system relies on a whole-process monitoring system to monitor the states of the temperature of an inner core of the optical cable, the surface temperature of the optical cable and the like in real time, and ice melting current control is realized by connecting current real-time adjusting equipment in series in a direct current ice melting loop. The temperature rise characteristic of the inner core of the optical cable is combined, the direct-current ice melting current value is intelligently linked with the temperature data of the optical core, the ice melting current and the temperature of the optical core can be controlled and controlled, and the safety of the optical cable is effectively protected.
Therefore, the power grid loss caused by ice coating of the OPGW optical cable is avoided, the capability of the line for coping with extreme weather such as rain, snow, ice and the like is effectively improved, and the operation reliability of the line is improved.
The following detailed description of the present invention will be provided in conjunction with the accompanying drawings.
Drawings
The invention is further described with reference to the accompanying drawings and the detailed description below:
FIG. 1 is a schematic diagram of a single-loop OPGW optical cable ice melting loop;
FIG. 2 is a schematic diagram of a dual-loop OPGW optical cable ice melting loop;
fig. 3 is a schematic diagram of an OPGW isolated splice closure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to avoid power grid loss caused by ice coating of the OPGW optical cable, effectively improve the capacity of the line for coping with extreme weather such as rain, snow, ice and the like and improve the operation reliability of the line, the fixed ice melting device is used as a power supply point, the lead and the OPGW optical cable are connected in series to form a direct-current ice melting loop, the OPGW optical cable of the power transmission line is subjected to insulation transformation, and the OPGW optical cable has the capacity of direct-current ice melting by depending on a digital ice coating whole-process monitoring system, an accurate ice melting system and the like.
The invention provides a real-time monitoring OPGW optical cable direct current ice melting system. Aiming at the insulation transformation of the OPGW optical cable of the power transmission line, an insulation structure is formed between the OPGW optical cable and the tower of the power transmission line. Therefore, the invention constructs an accurate ice melting system for the ground wire and the optical cable, and constructs a digital ice coating and melting overall process monitoring system for the process monitoring of ice coating and melting.
The accurate ice melting system for the ground wire and the optical cable is characterized in that an ice melting loop is constructed in a single-loop power failure ice melting mode and a double-loop power failure ice melting mode.
Referring to fig. 1, the single-circuit power failure ice melting adopts a single-side optical cable ice melting wiring mode, and is provided with a fixed ice melting device 1, a down-leading device 2, a tower cable 3, a first tower 4, a second tower 5, a lead and an OPGW optical cable. The fixed ice melting device 1, the phase conductor on the power transmission line, the OPGW optical cable and the phase conductor in the power transmission line are connected to form a direct-current ice melting through-current loop.
Referring to fig. 2, the double-circuit power failure ice melting adopts a wiring mode of melting ice simultaneously by using a double-side optical cable, and is provided with a fixed ice melting device 1, a down-leading device 2, a tower-following cable 3, a first tower 4, a second tower 5, a lead and a ground wire. The fixed ice melting device, the upper phase conductor on one side of the power transmission line, the OPGW optical cable on one side, the OPGW optical cable on the opposite side and the upper phase conductor on the opposite side of the power transmission line are connected to form a direct-current ice melting through-current loop.
At present, an OPGW optical cable usually adopts a base-by-base grounding mode, and the optical cable needs to be subjected to all-wire insulation transformation for realizing the deicing of the OPGW optical cable, so that the OPGW optical cable has the capacity of being connected with direct current to form a loop. Therefore, insulation configuration is reasonably carried out according to the ice melting voltage and the induction voltage, and the insulation level and the insulation gap of the ground wire are selected, so that the modified ground wire not only meets the induction voltage limit value and the lightning protection requirement under the daily operation working condition, but also meets the insulation strength requirement under the ice melting working condition.
The insulation transformation design of the OPGW ground wire mainly comprises transformation of a whole section of OPGW optical cable hardware fitting and transformation of a first section and a last section of tower OPGW optical cable down lead, the ground wire in the ice melting process can form an electrifying loop through the insulation transformation of the OPGW optical cable, and meanwhile, the insulation requirement and the lightning protection requirement of the tower are met.
For a tangent tower, an OPGW ground wire is grounded one by one, an existing suspension clamp is transformed into a suspension insulator string, 1 insulator is selected according to the consideration of the maximum output voltage of 9.5kV, the existing ground wire is removed, and a ground wire discharge gap is arranged.
For the strain tower, the purpose of insulation transformation is achieved by additionally installing the strain insulator string on the large and small sides of the OPGW ground wire on the strain tower. In order to keep the length of the ground wire in the span unchanged, the length of an OPGW ground wire with a certain distance is retracted during transformation, a connecting hardware fitting of the original OPGW and a tower body is removed, a strain insulator string is additionally arranged between the tail end of the OPGW and the tower body, the number of insulator pieces is 1, the original ground wire is removed, and a ground wire discharge gap is arranged. The OPGW is fixed on the ground wire bracket through the preformed armor rods.
The tower head part at the subsection is consistent with the strain tower, the insulation mode of the leading part and the tower body needs to be considered in a key mode, and the whole line of the leading part of the optical cable is led down from the outside of the tower body by adopting a supporting insulator to keep a safe distance with the tower body.
As shown in fig. 3, two OPGW cables are connected by cable closure 6. In order to realize the insulation of the optical cable connection box, the optical cable connection box adopts an OPGW isolation type insulation connection box to achieve the purpose of photoelectric separation of the optical cable, a hollow composite insulator 61 is arranged between the optical cable connection box 6 and the OPGW optical cable, the optical cable connection box 6 is fixed on a post composite insulator 62, and meanwhile, the rest optical cable is fixed on the post composite insulator and keeps insulation with a tower body of a tower.
Wherein, a digital icing ice-melt overall process monitoring system includes:
microclimate on-line monitoring device: the microclimate online monitoring device is used for monitoring the meteorological environment of the place where the line is located and transmitting the acquired meteorological environment parameters to the monitoring host computer in real time through the network;
lead ground wire temperature measurement on-line monitoring device: the ground wire temperature measurement online monitoring is used for sensing and automatically collecting the surface temperature of a lead and an OPGW optical cable, and transmitting the collected temperature parameters to a monitoring host computer in real time through a network;
icing on-line monitoring device: the ice coating on-line monitoring device is used for monitoring the ice coating condition of the power transmission line, and transmitting the ice coating condition of the power transmission line to the monitoring host computer in real time through a network;
wear fog type video on-line monitoring device: the fog penetrating type video online monitoring device is used for shooting and returning the icing state of the lead and the OPGW optical cable and the actual ice melting and ice removing processes of the lead and the OPGW optical cable, and transmitting the video to the monitoring host computer in real time through a network;
monitoring the host computer: the monitoring host is in communication connection with the microclimate online monitoring device, the ground wire temperature measurement online monitoring device, the ice coating online monitoring device and the fog penetrating type video online monitoring device.
Specifically, the meteorological environment parameters comprise temperature, humidity, wind direction, wind speed and air pressure parameters, the collected meteorological parameters and the change conditions thereof are transmitted to the system host computer in real time through the network, and the monitoring host computer stores, counts and analyzes the collected meteorological environment parameters.
In order to monitor the icing condition of the optical cable in the daily operation process and the deicing condition of the optical cable in the deicing process in real time, an icing tension sensor can be arranged at a hanging point of a suspension insulator string of a tangent tower at a higher altitude. The ice coating on-line monitoring device comprises an ice coating tension sensor, the ice coating tension sensor is additionally arranged on the line suspension string, and if the tension value monitored by the ice coating tension sensor is higher than a set normal value, ice melting operation needs to be continued.
In order to monitor the icing condition of the optical cable in the daily operation process and the deicing condition of the optical cable in the deicing process in real time, a through-fog type video online monitoring device is installed on a guide wire (ground wire) at the tower head of a tangent tower at the position with higher altitude of two loops of lines.
In order to avoid the influence of direct-current ice melting on the performance of the optical cable, the temperature of the OPGW optical cable in the ice melting process must be strictly controlled. The optical cable in the ice melting section can be divided into an ice covering section on the tower, a tower body section and a drainage wire lap joint, and the highest temperature in the ice melting process is required to be positioned at the drainage wire lap joint. A temperature monitoring device is arranged at the lap joint point of the drainage wire and the optical cable on the tower so as to strictly control the temperature rise of the optical cable; and meanwhile, a temperature monitoring device is arranged at the cable outlet point of the tower head for monitoring the temperature rise ice melting effect of the optical cable in real time.
And the temperature of the inner core of the OPGW optical cable is controlled within 65 ℃. The short-time limit temperature of the OPGW optical cable does not exceed 80 ℃.
The temperature of the inner core of the optical cable is controlled by controlling the direct-current ice melting current. Taking the fixed ice melting device with the capacity of 67.2MW, the maximum output direct current voltage of 13.3kV and the minimum output direct current voltage of 1.5kV as examples, the output direct current ice melting current range is adjustable in 9 grades according to the length of the ice melting line and the difference of the cross section of the lead. Under the two wiring modes, the ice melting current values under each gear are respectively shown in table 1 and table 2, and it can be seen that the minimum output current is 541A and the maximum current is 4683A under the unilateral ground wire ice melting wiring mode. And the minimum output current 271A and the maximum current 2342A are realized in a double-side ground wire ice melting wiring mode.
TABLE 1 Ice melting Current output at different gears of ice melting device (unilateral ground wire ice melting connection mode)
TABLE 2 Ice melting Current output at different gears of ice melting device (double-side ground wire ice melting connection mode)
Temperature rise characteristic of OPGW optical cable:
(1) in the through-flow state of the OPGW optical cable, because the surface of the optical cable is fast in heat dissipation, the temperature rise of the surface and the temperature rise of the optical core gradually tend to be different, the temperature of the optical core is gradually higher than the surface temperature, and the temperature of the optical core is far higher than the surface temperature in the final state;
(2) the temperature rise of the surface and the inner core of the optical cable tends to be stable after a certain time, and the stable temperature is positively correlated with the direct current.
The accurate ice melting system is based on a digital ice coating and ice melting overall process monitoring system, the states of the temperature of an inner core of the optical cable, the temperature of the surface of the optical cable and the like are monitored in real time, and ice melting current control is realized by connecting current real-time adjusting equipment in series in a direct current ice melting loop. The temperature rise characteristic curve of the inner core of the optical cable is combined, the direct-current ice melting current value is intelligently linked with the temperature data of the optical core, the ice melting current and the temperature of the optical core can be controlled and controlled, and the safety of the optical cable is effectively protected.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in other forms without departing from the spirit or essential characteristics thereof. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (10)
1. The utility model provides a real-time supervision's OPGW optical cable direct current ice-melt system, transmission line adopt the same tower two times to erect, adopt single time to have a power failure ice-melt and two times to have a power failure ice-melt two kinds of modes to establish ice-melt return circuit which characterized in that:
an insulation structure is arranged between the OPGW optical cable and the transmission line tower;
the single-loop power failure ice melting adopts a single-side optical cable ice melting wiring mode, and a fixed ice melting device, an upper phase conductor of the power transmission line, an OPGW optical cable and a middle phase conductor of the power transmission line are connected to form a direct current ice melting through-flow loop;
the double-circuit power failure ice melting adopts a wiring mode of double-side optical cables for ice melting at the same time, and a fixed ice melting device, an upper phase conductor on one side of the power transmission line, an OPGW optical cable on one side, an opposite side OPGW optical cable and an upper phase conductor on the opposite side of the power transmission line are connected to form a direct-current ice melting through-flow loop;
the system is also provided with an overall process monitoring system for monitoring the icing and ice melting conditions in real time, and the overall process monitoring system comprises: microclimate on-line monitoring device: the microclimate online monitoring device is used for monitoring the meteorological environment of the place where the power transmission line is located and transmitting the collected meteorological environment parameters to the monitoring host through the network;
lead ground wire temperature measurement on-line monitoring device: the ground wire temperature measurement online monitoring is used for sensing and automatically collecting the surface temperature of a lead and an OPGW optical cable, and transmitting the collected temperature parameters to a monitoring host through a network;
icing on-line monitoring device: the ice coating on-line monitoring device is used for monitoring the ice coating condition of the power transmission line, and transmitting the ice coating condition of the power transmission line to the monitoring host computer in real time through a network;
wear fog type video on-line monitoring device: the fog penetrating type video online monitoring device is used for shooting and returning the icing state of the lead and the OPGW optical cable and the actual ice melting and ice removing processes of the lead and the OPGW optical cable, and transmitting the video to the monitoring host computer in real time through a network;
monitoring the host computer: the monitoring host is in communication connection with the microclimate online monitoring device, the ground wire temperature measurement online monitoring device, the ice coating online monitoring device and the fog penetrating type video online monitoring device.
2. The real-time monitoring OPGW optical cable DC ice melting system of claim 1, characterized in that:
for the tangent tower, a suspension insulator string is adopted to fix the OPGW optical cable, the ground wires of the OPGW optical cable are grounded base by base, and a ground wire discharge gap is arranged.
3. The real-time monitoring OPGW optical cable DC ice melting system of claim 1, characterized in that: for the strain tower, the tail end of the OPGW is insulated from the tower body of the tower through a strain insulator string, and the ground wire discharge gap is arranged on the ground wire of the OPGW optical cable.
4. The real-time monitoring OPGW optical cable DC ice melting system of claim 1, characterized in that: the optical cable segmentation department adopts strain tower, and OPGW optical cable draws down the whole line of lower part and adopts post insulator and body of the tower to keep safe distance and draws down from the body of the tower outside.
5. The real-time monitoring OPGW optical cable DC ice melting system of claim 1, characterized in that: the two sections of OPGW optical cables are connected through an optical cable junction box, the optical cable junction box adopts an OPGW isolation type insulation junction box to achieve the purpose of photoelectric separation of the optical cables, and the rest optical cables are fixed on a post insulator to keep insulation with a tower body.
6. The real-time monitoring OPGW optical cable DC ice melting system of claim 1, characterized in that: the meteorological environment parameters comprise temperature, humidity, wind direction, wind speed and air pressure parameters, and various collected meteorological parameters and the variation conditions thereof are transmitted to the system host computer in real time through a network.
7. The real-time monitoring OPGW optical cable DC ice melting system of claim 1, characterized in that: the ice coating on-line monitoring device comprises an ice coating tension sensor, wherein the ice coating tension sensor is additionally arranged on the suspension string of the power transmission line, and ice melting operation is required if the tension value monitored by the ice coating tension sensor is higher than a set normal value.
8. The real-time monitoring OPGW optical cable DC ice melting system of claim 1, characterized in that: the temperature of the inner core of the OPGW optical cable is controlled within 65 ℃, and the short-time limit temperature of the OPGW optical cable does not exceed 80 ℃.
9. The real-time monitoring OPGW optical cable DC ice melting system of claim 1, characterized in that: and controlling the direct-current ice melting current to control the temperature of the inner core of the optical cable.
10. The real-time monitoring OPGW optical cable DC ice melting system of claim 1, characterized in that: and a temperature monitoring device is arranged at the lap joint point of the drainage wire and the optical cable, and a temperature monitoring device is arranged at the cable outlet point of the tower head.
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