CN115864281A - Live-line ice melting device and method for ultra-high voltage ground wire and optical fiber composite overhead ground wire - Google Patents
Live-line ice melting device and method for ultra-high voltage ground wire and optical fiber composite overhead ground wire Download PDFInfo
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- 230000008018 melting Effects 0.000 title claims abstract description 224
- 239000013307 optical fiber Substances 0.000 title claims abstract description 50
- 239000002131 composite material Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000001681 protective effect Effects 0.000 claims abstract description 26
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 238000004804 winding Methods 0.000 claims description 9
- 230000016507 interphase Effects 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical group 0.000 claims description 4
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims 1
- 230000005674 electromagnetic induction Effects 0.000 abstract description 6
- 230000006698 induction Effects 0.000 abstract description 6
- 230000003068 static effect Effects 0.000 abstract description 5
- 230000015556 catabolic process Effects 0.000 abstract description 4
- 238000009413 insulation Methods 0.000 abstract description 4
- 230000001052 transient effect Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 6
- 238000010309 melting process Methods 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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Abstract
The invention discloses an electrified ice melting device and method for an ultra-high voltage ground wire and an optical fiber composite overhead ground wire, wherein the device comprises a high-voltage bus, a high-voltage circuit breaker, a converter transformer, two converter valves, a protective ball gap, a protective lightning arrester, three quick grounding switches, a control protection device, two ice melting output high-voltage wires, an ice melting switch and an ice melting short-circuit switch; when steady-state overvoltage caused by static induction voltage and electromagnetic induction voltage occurs, the quick grounding disconnecting link is quickly grounded, and the breakdown discharge of a spherical gap is protected; when transient overvoltage occurs, the lightning arrester acts to protect the ice melting device. The over-voltage protection and insulation coordination of the ice melting device under the condition of live ice melting are realized, the safe operation of the ice melting device is ensured, and meanwhile, the reliable ice melting of the extra-high voltage ground wire and the OPGW under the condition of live line operation is effectively realized.
Description
Technical Field
The invention belongs to the technical field of high voltage and insulation, and particularly relates to an electrified ice melting device and method for an extra-high voltage ground wire and an optical fiber composite overhead ground wire.
Background
In recent years, some areas are gradually changed from a traditional non-icing area to an icing area, and due to ice coating, tripping faults of ultra-high voltage lines are increased gradually, so that the safe and stable operation of a power system is seriously influenced, and the normal life and industrial production of residents are seriously influenced.
When the power resource is far away from the power load center, ultra-high and extra-high voltage power transmission becomes a necessary choice for solving long-distance large-capacity power transmission. The transmission distance of the extra-high voltage direct current transmission line is long, ice on the ground wire caused by rain and snow is easily formed in winter, the ice on the ground wire is overloaded, and the accidents of discharging and wire breaking are easily caused. The ground wire and OPGW disconnection caused by icing overload of a certain +/-800 kV extra-high voltage line for two consecutive years causes line shutdown, and the safe and stable operation of the extra-high voltage line is seriously influenced. At present, line ice melting is carried out in an alternating current or direct current ice melting mode after power failure, and the method has the advantages of high ice melting speed, safety, reliability and the like; meanwhile, the ice melting is generally carried out on the lead, and the ice melting of the ground wire is extremely rare. However, the ultra-high voltage transmission line has large transmission capacity and high importance degree in the system, and a large amount of load loss and changes of the operation mode of the power grid are caused by power failure ice melting, so that the practical development difficulty is high. Meanwhile, the ground wire does not pass through current under the normal operation working condition, the icing of the ground wire is more serious than that of the lead, and the deicing of the ground wire is more required in practice.
However, the following problems exist when the direct current live deicing of the Ground Wire and the Optical Fiber Composite Overhead Ground Wire (OPGW) is carried out under the working condition of normal operation of the extra-high voltage line: (1) The direct current line in operation generates electrostatic induction voltage on the ground wire to be melted with ice and the OPGW, which can cause the ice melting device to be damaged; (2) An alternating current line crossing the operating line in parallel can generate electromagnetic induction voltage on a ground wire to be de-iced and an OPGW (optical fiber composite overhead ground wire), and can cause the de-icing device to be damaged; (3) During ice melting, a certain pole of the direct current line is suddenly failed and stopped, and transient overvoltage is generated on the ground wire and the OPGW, so that the ice melting device is damaged.
Disclosure of Invention
The invention provides an electrified ice melting device and method for an extra-high voltage ground wire and an optical fiber composite overhead ground wire, which can ensure that the electrified ice melting of the ground wire and an OPGW is realized safely and reliably under the condition of circuit operation, ensure that the ice melting device is safe and reliable under the electrified ice melting, and avoid the fault problems of wire breakage, discharge and the like caused by ice coating of an extra-high voltage circuit.
In order to achieve the purpose, the invention provides an electrified ice melting device for an extra-high voltage ground wire and an optical fiber composite overhead ground wire, which comprises a high-voltage bus, a high-voltage circuit breaker, a converter transformer, a first converter valve, a second converter valve, a protective spherical gap, a protective lightning arrester, a first quick grounding knife switch, a second quick grounding knife switch, a third quick grounding knife switch, a control protection device, a first ice melting output high-voltage wire, a second ice melting output high-voltage wire, an ice melting knife switch and an ice melting short-circuit knife switch; one end of a high-voltage circuit breaker is connected with a high-voltage bus, the other end of the high-voltage circuit breaker is connected with the input end of a converter transformer, two output ends of the converter transformer are respectively connected with the input ends of a first converter valve and a second converter valve, the output ends of the first converter valve and the second converter valve are respectively connected with one end of a first ice-melting output high-voltage wire and one end of a second ice-melting output high-voltage wire, the other ends of the first ice-melting output high-voltage wire and the second ice-melting output high-voltage wire are respectively connected with an overhead ground wire and an overhead ground wire through two ice-melting knife switches, the overhead ground wire and the overhead ground wire are respectively connected with an optical fiber composite overhead ground wire and an optical fiber composite overhead ground wire through two ice-melting short-circuit knife switches, and the optical fiber composite overhead ground wire are connected through drainage wires; the first ice melting output high-voltage wire and the second ice melting output high-voltage wire are both connected with a protective ball gap and a protective lightning arrester; the first quick grounding disconnecting link is connected to the first ice melting output high-voltage line; the second quick grounding disconnecting link is connected to the second ice melting output high-voltage line; the third quick grounding disconnecting link is connected to the neutral points of the first converter valve and the second converter valve; the control protection device is connected with the control ends of the high-voltage circuit breaker, the first converter valve, the second converter valve, the first quick grounding disconnecting link, the second quick grounding disconnecting link and the third quick grounding disconnecting link through control cables.
Furthermore, the high-voltage circuit breaker is a high-voltage vacuum circuit breaker and is arranged in the inflatable high-voltage switch cabinet.
Furthermore, the converter transformer is a three-phase three-winding rectifier transformer, the high-voltage side winding of the converter transformer is connected with the transformer in a delta mode, the low-voltage side winding of the converter transformer is connected with the transformer in a Y mode and connected with the transformer in a delta mode, and the rated voltage is determined by the rated output voltage of the ice melting device and the resistance of an ice melting line.
Further, the first converter valve and the second converter valve are both 6-pulse controllable converter valves, and the first converter valve and the two stages are connected in series to form a 12-pulse converter valve; the 12-pulse converter valve is provided with an interphase arrester, a direct current sensor and a direct current voltage divider.
Furthermore, the protective ball gap comprises two spherical electrodes, the protective ball gap is arranged in the sealed container and is inflated, the diameter of each spherical electrode is larger than 2 times of the ball gap distance, and the discharge voltage of the ball gap is smaller than or equal to the direct-current withstand voltage of the converter device.
Furthermore, the protection lightning arrester is a metal oxide lightning arrester, the continuous operation voltage of the protection lightning arrester is greater than the maximum output direct current voltage of the ice melting device, the lightning impulse residual voltage of the protection lightning arrester is less than or equal to the lightning impulse withstand voltage of the current conversion device, and the maximum through-current capacity of the protection lightning arrester needs to meet the requirement that the lightning arrester is not damaged in the protection action time under the maximum induced voltage of the circuit.
Furthermore, the first ice melting output high-voltage line and the second ice melting output high-voltage line are aerial wires or cables, the ice melting disconnecting link is a bidirectional disconnecting link, when the disconnecting link is arranged at the position (2) during ice melting, the ice melting device is connected with the ground wire to be melted, and when the ice melting disconnecting link is arranged at the position (1) during non-ice melting, the ice melting device is disconnected with the ground wire and the ground wire is grounded.
Furthermore, the first end and the last end of the ice melting section are respectively provided with a first photoelectric separation splice closure and a second photoelectric separation splice closure to realize the electrical isolation and the optical fiber communication conduction of the ice melting section and the non-ice melting section, and the ground wire splice closure is arranged in the middle of the ice melting section to realize the electrical and optical fiber communication conduction.
The electrified ice melting method of the ultra-high voltage ground wire and the optical fiber composite overhead ground wire based on the electrified ice melting device comprises the following steps:
step S1: calculating the ice melting voltage, the maximum ice melting current and the minimum ice melting current required by the ice melting of the ground wire and the OPGW according to the parameters of the line to be melted, the meteorological environment condition and the ice coating thickness;
step S2: selecting the on-off states of the first fast grounding disconnecting link, the second fast grounding disconnecting link and the third fast grounding disconnecting link according to the ice melting voltage;
and step S3: closing the ice melting short circuit knife switch, closing the ice melting knife switch at the position (2), and connecting the ice melting device with a ground wire to be melted with ice to form a closed loop;
and step S4: the control protection device controls a switch-on high-voltage circuit breaker through a control cable to start the ice melting of the ground wire and the optical fiber composite overhead ground wire;
step S5: adopting a tension sensor to monitor the icing weight on line, judging whether the on-line icing weight is less than 0.1M, wherein M is the initial total icing weight of the overhead ground wire and the optical fiber composite overhead ground wire: if yes, executing step S7, otherwise executing step S6;
step S6: fixing the ice melting current to be I, and returning to the step S5; the minimum ice melting current is less than I and less than the maximum ice melting current;
step S7: and (3) disconnecting the high-voltage circuit breaker by controlling the protection device, closing the ice melting knife switch at the position (1), grounding the ground wire to be melted with ice, and ending ice melting.
Furthermore, rated currents of the first fast grounding disconnecting link, the second fast grounding disconnecting link and the third fast grounding disconnecting link are larger than the maximum induced current induced on the ground wire when a line fails; when the two ends of the ice melting device need to output +/-5 kV rated voltage, the third quick grounding disconnecting link is in a closed position, and the first quick grounding disconnecting link and the second quick grounding disconnecting link are in an open position; when the ice melting device needs to output 10kV rated voltage, the second quick grounding disconnecting link is in a closed position, and the first quick grounding disconnecting link and the third quick grounding disconnecting link are in an open position; when the ice melting device needs to output-10 kV rated voltage, the first quick grounding disconnecting link is in a closed position, and the second quick grounding disconnecting link and the third quick grounding disconnecting link are in an open position.
Compared with the prior art, the invention has at least the following beneficial technical effects:
according to the electrified ice melting device for the ultra-high voltage ground wire and the optical fiber composite overhead ground wire, the line is protected by adopting equipment such as a protective spherical gap, a protective lightning arrester, a quick grounding switch and the like, when steady overvoltage caused by static induction voltage and electromagnetic induction voltage occurs, the quick grounding switch is quickly grounded, and breakdown discharge of the spherical gap is protected; when transient overvoltage occurs, the lightning arrester acts to protect the ice melting device. The over-voltage protection and insulation cooperation of the ice melting device under the condition of live ice melting are realized, the safe operation of the ice melting device is ensured, and meanwhile, the reliable ice melting of the ultra-high voltage ground wire and the OPGW under the condition of live line operation is effectively realized.
Furthermore, the two converter valves are both 6-pulse controllable converter valves, and two stages of the two converter valves are connected in series to form a 12-pulse converter valve; the 12-pulse converter valve is provided with an interphase lightning arrester, a direct current sensor and a direct current voltage divider, so that interphase overvoltage protection, overcurrent protection and overvoltage protection of the converter valve are realized.
Furthermore, the protective ball gap is arranged in the sealed container and is inflated, so that the direct current side equipment is protected from being damaged under the steady overvoltage, and the ice melting equipment is ensured not to be damaged under the static induction voltage of the running direct current line and the electromagnetic induction voltage of the parallel alternating-current cross-over alternating current line.
The ice melting method comprises the steps of firstly calculating ice melting voltage and ice melting current according to actual conditions, then determining the on-off state of the quick grounding disconnecting link according to the ice melting voltage, applying proper current for melting ice, and completing ice melting when the online ice coating weight is smaller than a set value. Multiple voltage outputs can be realized through the quick grounding disconnecting link, proper voltage can be provided for an acted line, and the flexibility of the whole ice melting method is improved.
Drawings
FIG. 1 is a schematic structural diagram of an ultra-high voltage ground wire and OPGW live ice melting device according to an embodiment of the present invention;
1-high voltage bus, 2-high voltage circuit breaker, 3-converter transformer, 4-1-first converter valve, 4-2-second converter valve, 5-1-first protection spherical gap, 5-2-second protection spherical gap, 6-1-first protection arrester, 6-2-second protection arrester, 7-1-first fast grounding knife switch, 7-2-second fast grounding knife switch, 7-3-third fast grounding knife switch, 8-control protection device, 9-1-first ice melting output high voltage wire, 9-2-second ice melting output high voltage wire, 10-1-first ice melting knife switch, 10-2-second ice melting knife switch, 11-1-first overhead ground wire, 11-2-second ice melting overhead ground wire, 12-1-first ice melting knife switch, 12-2-second ice melting short circuit knife switch, 13-1-first optical fiber composite ground wire, 13-2-second optical fiber composite connection wire, 13-3-optical connection wire, 14-1-first ice melting knife switch, 12-2-second ice melting output high voltage wire, 13-1-second ice melting output high voltage wire, 14-first ice melting output high voltage wire, 14-second ice melting output high voltage wire, and second ice melting output high voltage box.
Fig. 2 is a schematic flow chart of an electrified ice melting method for an extra-high voltage ground wire and an OPGW in the embodiment of the present invention, where the marks in fig. 2 illustrate:
s1, calculating voltage and current required by ice melting according to line parameters, meteorological environment conditions and ice coating thickness;
s2, selecting a rapid grounding disconnecting link on-off state;
s3, closing the ice-melting short-circuit knife switch and the ice-melting knife switch;
s4, closing the high-voltage circuit breaker and starting to melt ice;
s5, setting the initial total icing weight of the ground wire to be M, and judging whether the online icing weight is less than 0.1M;
s6, fixing the ice melting current to be I;
and S7, opening the high-voltage circuit breaker, grounding the ice melting disconnecting link, and finishing ice melting.
Detailed Description
In order to make the objects and technical solutions of the present invention clearer and easier to understand. The present invention will be described in further detail with reference to the drawings and examples, and the specific examples are provided for illustrative purposes only and are not intended to limit the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings and specific examples.
As shown in figure 1, the electrified ice melting device for the ultra-high voltage ground wire and the optical fiber composite overhead ground wire comprises a high-voltage bus 1, a high-voltage circuit breaker 2, a converter transformer 3, a first converter valve 4-1, a second converter valve 4-2, a first protection spherical gap 5-1, a second protection spherical gap 5-2, a first protection lightning arrester 6-1, a second protection lightning arrester 6-2, a first quick grounding knife switch 7-1, a second quick grounding knife switch 7-2, a third quick grounding knife switch 7-3, a control protection device 8, a first ice melting output high-voltage wire 9-1, a second ice melting output high-voltage wire 9-2, a first ice melting knife switch 10-1, a second ice melting knife switch 10-2, a first ice melting short-circuit knife switch 12-1 and a second ice melting short-circuit knife switch 12-2.
The high-voltage bus 1 is generally led out from a 35kV overhead line T or a 35kV side bus of a transformer substation, and the lead-out capacity of the high-voltage bus should meet the requirement of the rated output capacity of the ice melting device. One end of the high-voltage circuit breaker 2 is connected with a high-voltage bus 1, the other end of the high-voltage circuit breaker 2 is connected with the input end of a converter transformer 3, two output ends of the converter transformer 3 are respectively connected with the input ends of a first converter valve 4-1 and a second converter valve 4-2, the output end of the first converter valve 4-1 is connected with one end of a first ice-melting output high-voltage wire 9-1, the output end of the second converter valve 4-2 is connected with one end of a second ice-melting output high-voltage wire 9-2, the other end of the first ice-melting output high-voltage wire 9-1 is connected with a first overhead ground wire 11-1 through a first ice-melting knife switch 10-1, the other end of the second ice-melting output high-voltage wire 9-2 is connected with a second overhead ground wire 11-2 through a second ice-melting knife switch 10-2, the first overhead ground wire 11-1 is connected with a first optical fiber composite overhead ground wire 13-1 through a first ice-melting knife switch 12-1, the second overhead ground wire 11-2 is connected with a second ice-melting short-circuit knife switch 13-2, and the first optical fiber composite overhead ground wire 13-2 is connected through a second overhead ground wire 13-3. The first protection spherical gap 5-1, the first protection lightning arrester 6-1 and the first quick grounding disconnecting link 7-1 are connected to the first ice melting output high voltage wire 9-1, and the second protection spherical gap 5-2, the second protection lightning arrester 6-2 and the second quick grounding disconnecting link 7-2 are connected to the second ice melting output high voltage wire 9-2. One end of the third quick grounding knife switch 7-3 is connected to neutral points of the first converter valve 4-1 and the second converter valve 4-2, and the other end of the third quick grounding knife switch is grounded. The control protection device 8 is connected with the control ends of the high-voltage circuit breaker 2, the first converter valve 4-1, the second converter valve 4-2, the first quick grounding disconnecting link 7-1, the second quick grounding disconnecting link 7-2 and the third quick grounding disconnecting link 7-3 through control cables.
The high-voltage circuit breaker 2 is a 40.5kV high-voltage vacuum circuit breaker and is arranged in the inflatable high-voltage switch cabinet, so that the voltage of a high-voltage bus is safely connected to the input end of the converter transformer 3.
The converter transformer 3 is a three-phase three-winding rectifier transformer, the high-voltage side winding of the converter transformer is a delta connection transformer with rated voltage of 35kV, the low-voltage side winding of the converter transformer is a Y connection and delta connection transformer, the rated voltage of the converter transformer is determined by the rated output voltage (the first ice melting output high-voltage wire 9-1 or the second ice melting output high-voltage wire 9-2) of the ice melting device and the resistance of the ice melting line, and the voltage transmitted to the first overhead ground wire 11-1 and the second overhead ground wire 11-2 is ensured to reach the ice melting voltage. In this embodiment, the rated output voltage of the ice melting device is 10kV, the rated output current is 1kA, and the rated voltage of the low-voltage side of the commutation transformer is 4.14kV through calculation.
The first converter valve 4-1 and the second converter valve 4-2 are both 6-pulse controllable converter valves, the first converter valve 4-1 is positively connected with and outputs positive polarity voltage, the second converter valve 4-2 is reversely connected with and outputs negative polarity voltage, and the first converter valve 4-1 and the second converter valve 4-2 are connected in series in two stages to form a 12-pulse converter valve. The 12-pulse converter valve is provided with auxiliary devices such as an interphase lightning arrester, a direct current sensor, a direct current voltage divider and the like, so that interphase overvoltage protection, converter valve overcurrent protection and converter valve overvoltage protection of the converter valve are realized, and the 12-pulse converter valve and the auxiliary devices form a converter device.
The interphase lightning arrester realizes interphase overvoltage protection of the converter valve, the direct current sensor realizes overcurrent protection of the converter valve, and the direct current divider realizes overvoltage protection of the converter valve.
A first protective spherical gap 5-1, a second protective spherical gap 5-2, a first protective lightning arrester 6-1, a second protective lightning arrester 6-2, a first fast grounding knife switch 7-1 and a second fast grounding knife switchThe switch 7-2, the third fast grounding disconnecting link 7-3 and the control protection device 8 are all used for realizing overvoltage protection of the converter device. The first protective spherical gap 5-1 and the second protective spherical gap 5-2 are arranged in the sealed container and inflated to protect direct current side equipment from being damaged under steady overvoltage, and particularly to ensure that ice melting equipment is not damaged under static induction voltage of an operating direct current line and electromagnetic induction voltage of a parallel alternating-current line and a cross alternating-current line. Specifically, the protective spherical gap comprises two spherical electrodes, the diameter of each spherical electrode is more than 2 times of the spherical gap distance, so that the discharge gap is ensured to be a slightly uneven electric field, and the discharge dispersity is reduced; the discharge voltage of the protective spherical gap is less than or equal to the direct-current withstand voltage of the converter device, and the spherical gap is ensured to be firstly subjected to breakdown discharge under the static induction voltage and the electromagnetic induction voltage; the inflation type of the protective ball gap is SF 6 、N 2 Or air, the distance of the inflation gap is determined by the inflation type and the gas pressure, and the breakdown voltage of the spherical gap can be selected to be 15kV and less than or equal to the insulation level of the ice melting device in the embodiment.
The first protection lightning arrester 6-1 and the second protection lightning arrester 6-2 are metal oxide lightning arresters, the continuous operation voltage of the first protection lightning arrester is larger than the maximum output direct current voltage of the ice melting device, the lightning impulse residual voltage of the first protection lightning arrester is smaller than or equal to the lightning impulse withstand voltage of the current conversion device, the maximum through current capacity of the first protection lightning arrester needs to meet the requirement that the lightning arresters are not damaged in the protection action time under the maximum induced voltage of a circuit, sudden failure shutdown of one pole of the direct current circuit in the ice melting process is ensured, and transient overvoltage is generated on a ground wire and an OPGW (optical fiber composite overhead ground wire) so that the lightning arresters are not damaged. The metal oxide arrester of the embodiment can select a station type composite jacket zinc oxide gapless arrester with the rated voltage of 14kV, the lightning impulse residual voltage of 25kV and the rated through-current capacity of 100kJ.
The grounding states of the first fast grounding disconnecting link 7-1, the second fast grounding disconnecting link 7-2 and the third fast grounding disconnecting link 7-3 are determined by the type of the output voltage of the ice melting device, and the rated current of the ice melting device is larger than the maximum induced current induced on the ground wire when the line fails; when the two ends of the ice melting device need to output +/-5 kV rated voltage, the third quick grounding disconnecting link 7-3 is in a closed position, and the first quick grounding disconnecting link 7-1 and the second quick grounding disconnecting link 7-2 are in an open position; when the ice melting device needs to output 10kV rated voltage, the second quick grounding disconnecting link 7-2 is in a closed position, and the first quick grounding disconnecting link 7-1 and the third quick grounding disconnecting link 7-3 are in an open position; when the ice melting device needs to output-10 kV rated voltage, the first quick grounding disconnecting link 7-1 is in a closed position, and the second quick grounding disconnecting link 7-2 and the third quick grounding disconnecting link 7-3 are in an open position. The control protection device 8 is used for controlling the high-voltage circuit breaker 2, the first converter valve 4-1, the second converter valve 4-2, the first quick grounding disconnecting link 7-1, the second quick grounding disconnecting link 7-2 and the third quick grounding disconnecting link 7-3 to be quickly switched when overvoltage occurs, and specifically, the high-voltage circuit breaker 2 is controlled to be disconnected, the first quick grounding disconnecting link 7-1, the second quick grounding disconnecting link 7-2 and the third quick grounding disconnecting link 7-3 are controlled to be quickly grounded, and the ice melting device is prevented from being damaged by the overvoltage.
The first ice melting output high voltage wire 9-1 and the second ice melting output high voltage wire 9-2 can adopt a 10kV overhead wire or a 10kV cable and are respectively connected with a first overhead ground wire 11-1 and a second overhead ground wire 11-2 through a first ice melting disconnecting link 10-1 and a second ice melting disconnecting link 10-2, the first ice melting disconnecting link 10-1 and the second ice melting disconnecting link 10-2 are bidirectional disconnecting links, the disconnecting links are arranged at the position (2) during ice melting, the ice melting device is connected with the ground wire to be melted, the disconnecting links are arranged at the position (1) during non-ice melting, the ice melting device is disconnected with the ground wire, and the ground wire is grounded; the head end and the tail end of the overhead ground wire are respectively connected with a first optical fiber composite overhead ground wire 13-1 and a second optical fiber composite overhead ground wire 13-2 through a first ice melting short-circuit disconnecting link 12-1 and a second ice melting short-circuit disconnecting link 12-2, and the two ends of a drainage wire 13-3 are respectively connected with the first optical fiber composite overhead ground wire 13-1 and the second optical fiber composite overhead ground wire 13-2 to form an ultra-high voltage ground wire OPGW (optical fiber composite overhead ground wire) ice melting closed loop. The first overhead ground wire 11-1 and the second overhead ground wire 11-2 are electrically insulated from a line tower through a supporting insulator, and the first ice-melting short-circuit disconnecting link 12-1 and the second ice-melting short-circuit disconnecting link 12-2 are both in a closed position during ice melting.
The first photoelectric separation junction box 14-1 and the second photoelectric separation junction box 14-3 are adopted at the first end and the last end of the ice melting section to realize the electrical isolation and the optical fiber communication conduction of the ice melting section and the non-ice melting section, and the ground wire junction box 14-2 is adopted in the middle of the ice melting section to realize the electrical and the optical fiber communication conduction of the ice melting section and the non-ice melting section.
Referring to fig. 2, the electrified ice melting method for the ultra-high voltage ground wire and the optical fiber composite overhead ground wire comprises the following steps:
step S1: and calculating the ice melting voltage and the ice melting current required by the ice melting of the overhead ground wire and the OPGW according to the parameters of the line to be melted, the meteorological environment conditions and the ice coating thickness. In this step, the actual ice-melting current of the wire should be selected between the minimum ice-melting current and the maximum ice-melting current in combination with the ice-melting time. When the ice melting current is less than the minimum ice melting current, the ice melting is ineffective, and when the ice melting current is greater than the maximum ice melting current, the lead is permanently deformed, so that the sag is increased or the mechanical strength of the lead is damaged.
Step S2: and selecting the on-off states of the first fast grounding disconnecting link 7-1, the second fast grounding disconnecting link 7-2 and the third fast grounding disconnecting link 7-3 according to the ice melting voltage. In this step, one of the grounding knife switch 7-1 or the second fast grounding knife switch 7-2 is selected to be grounded.
When the two ends of the ice melting device need to output +/-5 kV rated voltage, the third quick grounding disconnecting link 7-3 is in a closed position, the first quick grounding disconnecting link 7-1, the quick grounding knife and the third quick grounding disconnecting link 7-2 are in an open position, when the ice melting device needs to output 10kV rated voltage, the second quick grounding disconnecting link 7-2 is in a closed position, the first quick grounding disconnecting link 7-1 and the third quick grounding disconnecting link 7-3 are in an open position, when the ice melting device needs to output-10 kV rated voltage, the first quick grounding disconnecting link 7-1 is in the closed position, and the second quick grounding disconnecting link 7-2 and the third quick grounding disconnecting link 7-3 are in the open position.
And step S3: closing the first ice melting short-circuit disconnecting link 12-1 and the second ice melting short-circuit disconnecting link 12-2, closing the first ice melting disconnecting link 10-1 and the second ice melting disconnecting link 10-2 at the position (2), and connecting the ice melting device with a ground wire to be melted with ice and forming a closed loop;
and step S4: the control protection device 8 controls the switching-on high-voltage circuit breaker 2 through the control cable to start to melt ice on the ground wire and the OPGW. In the step, after ice melting is started, the direct current output current is adjusted to be between the maximum ice melting current and the minimum ice melting current by adjusting the trigger conduction angle of the converter valve.
Step S5: setting the initial total ice coating weight of the overhead ground wire and the optical fiber composite overhead ground wire as M, monitoring the ice coating weight on line by using a tension sensor in the ice melting process, controlling a protection device to judge whether the overhead ground wire and the optical fiber composite overhead ground wire meet the online ice coating weight of less than 0.1M in the ice melting process, executing a step S7 if the judgment is met, and executing a step S6 if the judgment is not met. In the step, the change of the icing weight is monitored through the tension sensor, and when the icing weight is less than 10% of the initial total icing weight M, the ice melting work is judged to be finished.
Step S6: and fixing the trigger conduction angle of the converter valve by controlling the protection device 8 to fix the ice melting current as I, and returning to the step S5.
Step S7: the high-voltage circuit breaker 2 is disconnected by controlling the protection device 8, the first ice-melting disconnecting link 10-1 and the second ice-melting disconnecting link 10-2 are combined at the position (1), namely the first overhead ground wire 11-1 and the second overhead ground wire 11-2 are grounded, and ice melting is finished. In this step, the high-voltage circuit breaker 2 and the ice-melting disconnecting link are disconnected after ice melting is finished, and the ice-melting device is electrically isolated from the power supply and the line.
The above description is only an embodiment of the present invention, but the application scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the application scope of the present invention. Therefore, the scope of the application of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An electrified ice melting device for an ultra-high voltage ground wire and an optical fiber composite overhead ground wire is characterized by comprising a high-voltage bus (1), a high-voltage circuit breaker (2), a converter transformer (3), a first converter valve (4-1), a second converter valve (4-2), a protective spherical gap, a protective lightning arrester, a first quick grounding disconnecting link (7-1), a second quick grounding disconnecting link (7-2), a third quick grounding disconnecting link (7-3), a control protection device (8), a first ice melting output high-voltage wire (9-1), a second ice melting output high-voltage wire (9-2), an ice melting disconnecting link and an ice melting short-circuit disconnecting link;
one end of the high-voltage circuit breaker (2) is connected with a high-voltage bus (1), the other end of the high-voltage circuit breaker is connected with the input end of a converter transformer (3), two output ends of the converter transformer (3) are respectively connected with the input ends of a first converter valve (4-1) and a second converter valve (4-2), the output ends of the first converter valve (4-1) and the second converter valve (4-2) are respectively connected with one ends of a first ice melting output high-voltage wire (9-1) and a second ice melting output high-voltage wire (9-2), the other ends of the first ice melting output high-voltage wire (9-1) and the second ice melting output high-voltage wire (9-2) are respectively connected with an overhead ground wire (11-1) and an overhead ground wire (11-2) through two ice melting knife switches, the overhead ground wire (11-1) and the overhead ground wire (11-2) are respectively connected with an optical fiber composite overhead ground wire (13-1) and an optical fiber composite overhead ground wire (13-2) through two short-circuit knife switches, and the optical fiber composite overhead ground wire (13-1) and the optical ground wire (13-2) are respectively connected through an overhead ground wire (13-2);
the first ice melting output high voltage wire (9-1) and the second ice melting output high voltage wire (9-2) are both connected with a protective ball gap and a protective lightning arrester; the first quick grounding disconnecting link (7-1) is connected to the first ice melting output high-voltage wire (9-1); the second quick grounding disconnecting link (7-2) is connected to the second ice melting output high-voltage wire (9-2); the third quick grounding disconnecting link (7-3) is connected to neutral points of the first converter valve (4-1) and the second converter valve (4-2);
the control protection device (8) is connected with the control ends of the high-voltage circuit breaker (2), the first converter valve (4-1), the second converter valve (4-2), the first quick grounding disconnecting link (7-1), the second quick grounding disconnecting link (7-2) and the third quick grounding disconnecting link (7-3) through control cables.
2. The electrified deicing device for the ultra-high voltage ground wire and the optical fiber composite overhead ground wire according to claim 1, characterized in that: the high-voltage circuit breaker (2) is a high-voltage vacuum circuit breaker and is arranged in the inflatable high-voltage switch cabinet.
3. The electrified ice melting device for the extra-high voltage ground wire and the optical fiber composite overhead ground wire according to claim 1, characterized in that: the converter transformer (3) is a three-phase three-winding rectifier transformer, a delta connection transformer is arranged on a high-voltage side winding of the converter transformer (3), a Y connection and a delta connection transformer are arranged on a low-voltage side winding of the converter transformer, and rated voltage is determined by rated output voltage of the ice melting device and ice melting line resistance.
4. The electrified ice melting device for the extra-high voltage ground wire and the optical fiber composite overhead ground wire according to claim 1, characterized in that: the first converter valve (4-1) and the second converter valve (4-2) are both 6-pulse controllable converter valves, and the first converter valve (4-1) and the second converter valve (4-2) are connected in series in two stages to form a 12-pulse converter valve; the 12-pulse converter valve is provided with an interphase arrester, a direct current sensor and a direct current voltage divider.
5. The electrified ice melting device for the extra-high voltage ground wire and the optical fiber composite overhead ground wire according to claim 1, characterized in that: the protective spherical gap comprises two spherical electrodes, the protective spherical gap is arranged in the sealed container and is inflated, the diameter of the spherical electrode is larger than 2 times of the spherical gap distance, and the discharge voltage of the spherical gap is smaller than or equal to the direct-current withstand voltage of the converter device.
6. The electrified ice melting device for the extra-high voltage ground wire and the optical fiber composite overhead ground wire according to claim 5, characterized in that: the protection lightning arrester is a metal oxide lightning arrester, the continuous operation voltage of the protection lightning arrester is greater than the maximum output direct current voltage of the ice melting device, the lightning impulse residual voltage of the protection lightning arrester is less than or equal to the lightning impulse withstand voltage of the current conversion device, and the maximum through current capacity of the protection lightning arrester needs to meet the requirement that the lightning arrester is not damaged in the protection action time under the maximum induced voltage of a circuit.
7. The electrified ice melting device for the extra-high voltage ground wire and the optical fiber composite overhead ground wire according to claim 1, characterized in that: the first ice melting output high-voltage line (9-1) and the second ice melting output high-voltage line (9-2) are overhead wires or cables, the ice melting disconnecting link is a bidirectional disconnecting link, when the disconnecting link is arranged at the position (2) during ice melting, the ice melting device is connected with a ground wire to be melted, and when the ice melting disconnecting link is arranged at the position (1) during non-ice melting, the ice melting device is disconnected with the ground wire and the ground wire is grounded.
8. The electrified ice melting device for the extra-high voltage ground wire and the optical fiber composite overhead ground wire according to claim 1, characterized in that: the first end and the last end of the ice melting section are respectively provided with a first photoelectric separation splice closure (14-1) and a second photoelectric separation splice closure (14-3) to realize the electrical isolation of the ice melting section and the non-ice melting section and the conduction of optical fiber communication, and the ground wire splice closure (14-2) is arranged in the middle of the ice melting section to realize the conduction of the electrical and optical fiber communication.
9. The electrified deicing method for the ultra-high voltage ground wire and the optical fiber composite overhead ground wire of the electrified deicing device based on claim 1 is characterized by comprising the following steps:
step S1: calculating the ice melting voltage, the maximum ice melting current and the minimum ice melting current required by the ice melting of the ground wire and the OPGW according to the parameters of the line to be melted, the meteorological environment condition and the ice coating thickness;
step S2: selecting the on-off states of the first fast grounding disconnecting link (7-1), the second fast grounding disconnecting link (7-2) and the third fast grounding disconnecting link (7-3) according to the ice melting voltage;
and step S3: closing the ice melting short circuit knife switch, closing the ice melting knife switch at the position (2), and connecting the ice melting device with a ground wire to be melted with ice to form a closed loop;
and step S4: the control protection device (8) controls the switch-on high-voltage circuit breaker (2) through the control cable to start the ice melting of the ground wire and the optical fiber composite overhead ground wire;
step S5: adopting a tension sensor to monitor the icing weight on line, and judging whether the online icing weight is less than 0.1M, wherein M is the initial total icing weight of the overhead ground wire and the optical fiber composite overhead ground wire: if yes, executing step S7, otherwise executing step S6;
step S6: fixing the ice melting current to be I, and returning to the step S5; the minimum ice melting current is less than I and less than the maximum ice melting current;
step S7: and (3) disconnecting the high-voltage circuit breaker (2) by controlling the protection device (8), closing the ice melting knife at the position (1), grounding the ground wire to be melted with ice, and ending ice melting.
10. The electrified ice melting method for the ultra-high voltage ground wire and the optical fiber composite overhead ground wire according to claim 9,
rated currents of the first fast grounding disconnecting link (7-1), the second fast grounding disconnecting link (7-2) and the third fast grounding disconnecting link (7-3) are larger than the maximum induced current induced on the ground wire when a line fails; when the two ends of the ice melting device need to output +/-5 kV rated voltage, the third quick grounding disconnecting link (7-3) is in a closed position, and the first quick grounding disconnecting link (7-1) and the second quick grounding disconnecting link (7-2) are in an open position; when the ice melting device needs to output 10kV rated voltage, the second quick grounding disconnecting link (7-2) is in a closed position, and the first quick grounding disconnecting link (7-1) and the third quick grounding disconnecting link (7-3) are in an open position; when the ice melting device needs to output-10 kV rated voltage, the first quick grounding disconnecting link (7-1) is in a closed position, and the second quick grounding disconnecting link (7-2) and the third quick grounding disconnecting link (7-3) are in an open position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211477579.1A CN115864281A (en) | 2022-11-23 | 2022-11-23 | Live-line ice melting device and method for ultra-high voltage ground wire and optical fiber composite overhead ground wire |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211477579.1A CN115864281A (en) | 2022-11-23 | 2022-11-23 | Live-line ice melting device and method for ultra-high voltage ground wire and optical fiber composite overhead ground wire |
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| CN115864281A true CN115864281A (en) | 2023-03-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116885658A (en) * | 2023-09-08 | 2023-10-13 | 湖南防灾科技有限公司 | Uninterrupted ground wire ice melting method and processor for extra-high voltage transmission line |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116885658A (en) * | 2023-09-08 | 2023-10-13 | 湖南防灾科技有限公司 | Uninterrupted ground wire ice melting method and processor for extra-high voltage transmission line |
| CN116885658B (en) * | 2023-09-08 | 2023-12-12 | 湖南防灾科技有限公司 | Uninterrupted ground wire ice melting method and processor for extra-high voltage transmission line |
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