Extra-high voltage ground wire ice melting system
By introducing a current protection module and a bypass switch into the UHV ground wire de-icing system, the problem of AC side damage caused by short circuit faults in the de-icing circuit was solved, enabling reliable de-icing without power interruption and ensuring the safety and stability of the power system.
Patent Information
- Application Number
- CN202511701239.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-19
- Publication Date
- 2026-01-16
AI Technical Summary
UHV ground wires are prone to short-circuit faults in the de-icing circuit during DC de-icing, which can damage the AC side. After the damage, the ground wire cannot be de-iced, affecting the reliability and safety of the power system.
Design an ultra-high voltage ground wire de-icing system, including an AC output device, a DC output device, a current protection module, a bypass switch, and a de-icing protection circuit. The current protection module detects short-circuit faults and quickly disconnects the de-icing protection circuit. The bypass switch inputs AC power to the DC output device to ensure the reliability of the de-icing process.
It effectively prevents damage to AC output devices from short-circuit faults, achieves uninterrupted de-icing, ensures normal power transmission and reliable de-icing of ground wires, and meets the requirements of rapid protection and reliable de-icing.
Smart Images
Figure CN121355801A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of ground wire ice melting, and particularly relates to an extra-high voltage ground wire ice melting system. BACKGROUND
[0002] At present, the problem of ground wire icing can be effectively solved by means of direct current ice melting. However, when the extra-high voltage ground wire is subjected to direct current ice melting, ice melting loop short circuit fault may occur, which is easy to cause damage to the ice melting alternating current side first, but the fault time is short and the short circuit current is large, so it is difficult to realize fast and reliable protection of the ice melting alternating current side, and after the ice melting alternating current side is damaged, the ground wire ice melting cannot be carried out, thereby causing damage to the ground wire icing. SUMMARY
[0003] In view of the above defects or deficiencies, the application provides an extra-high voltage ground wire ice melting system, aiming to solve the technical problems that the alternating current side is easy to be damaged when the ice melting loop short circuit fault occurs, and the ground wire ice melting cannot be carried out after the alternating current side is damaged.
[0004] In order to achieve the above purpose, the application provides an extra-high voltage ground wire ice melting system, which comprises: an alternating current output device; a direct current output device for connecting with the ground wire; an ice melting protection device comprising a current protection module, a bypass knife switch and an ice melting protection line, the alternating current output device being connected with the direct current output device through the ice melting protection line, the current protection module being arranged on the ice melting protection line and being used for detecting short circuit fault information and disconnecting the ice melting protection line according to the short circuit fault information, and the bypass knife switch being arranged in parallel with the current protection module.
[0005] In the embodiment of the application, the short circuit fault information is at least composed of the current of the line, and the ice melting protection device further comprises a controller, which is in communication connection with the current protection module, and the controller is configured to: generate a short circuit fault early warning signal when it is determined that the current of the line is within a first preset current range; generate a short circuit fault warning signal when it is determined that the current of the line is within a second preset current range; wherein any value within the first preset current range is smaller than any value within the second preset current range.
[0006] In the embodiment of the application, the direct current output device comprises a pulse rectifier and a direct current output line, the pulse rectifier is connected with the ice melting protection line, and the direct current output line is connected with the pulse rectifier and the ground wire respectively.
[0007] In the embodiment of the present application, the pulse rectifier comprises a first rectifier module and a second rectifier module, the first rectifier module and the second rectifier module are connected with the ice-melting protection circuit respectively, the direct-current output circuit comprises a positive connection line, a negative connection line and a terminal output line, the terminal output line is connected with the ground wire, one end of the positive connection line is connected with the terminal output line, and the other end of the positive connection line is branched and connected with the first rectifier module and the second rectifier module one by one, one end of the negative connection line is connected with the terminal output line, and the other end of the negative connection line is branched and connected with the first rectifier module and the second rectifier module one by one.
[0008] In the embodiment of the present application, the positive connection line comprises a positive main line, a first positive branch line and a second positive branch line, one end of the positive main line is connected with the terminal output line, and the other end of the positive main line is branched and connected with the first positive branch line and the second positive branch line one by one, the first positive branch line is connected with the first rectifier module and is provided with a first direct-current switching knife switch, and the second positive branch line is connected with the second rectifier module and is provided with a first series-parallel switching knife switch. The negative connection line comprises a negative main line, a first negative branch line and a second negative branch line, one end of the negative main line is connected with the terminal output line, and the other end of the negative main line is branched and connected with the first negative branch line and the second negative branch line one by one, the first negative branch line is connected with the first rectifier module and is provided with a second series-parallel switching knife switch, and the second negative branch line is connected with the second rectifier module and is provided with a second direct-current switching knife switch.
[0009] In the embodiment of the present application, the direct-current output circuit further comprises a series-parallel switching line, two ends of the series-parallel switching line are connected with the second positive branch line and the first negative branch line one by one respectively, and the series-parallel switching line is provided with a third series-parallel switching knife switch.
[0010] In the embodiment of the present application, the controller is further configured to: select a first ice-melting closing scheme when it is determined that the ground wire is in a light icing state; select a second ice-melting closing scheme when it is determined that the ground wire is in a heavy icing state; wherein the first ice-melting closing scheme is configured to close the first direct-current switching knife switch, the second direct-current switching knife switch, the first series-parallel switching knife switch, the second series-parallel switching knife switch, and open the third series-parallel switching knife switch; and the second ice-melting closing scheme is configured to close the first direct-current switching knife switch, the second direct-current switching knife switch and the third series-parallel switching knife switch, and open the first series-parallel switching knife switch and the second series-parallel switching knife switch.
[0011] In the embodiment of the present application, the ultra-high voltage ground wire ice-melting system further comprises an icing detection device, the icing detection device is in communication connection with the controller and is used for detecting the ground wire icing thickness, and the controller is further configured to: determine that the ground wire is in a light icing state when it is determined that the icing thickness of the ground wire is within a first preset thickness range; determine that the ground wire is in a heavy icing state when it is determined that the icing thickness of the ground wire is within a second preset thickness range; and any value in the first preset thickness range is less than any value in the second preset thickness range.
[0012] In the embodiment of the present application, the AC output device comprises a power supply, a pulse rectifier transformer and an AC output circuit, the pulse rectifier transformer is arranged on the AC output circuit, and the AC output circuit is connected with the power supply and the ice melting protection circuit respectively.
[0013] In the embodiment of the present application, the AC output device further comprises an AC output switch, the AC output switch is arranged on the AC output circuit, and the AC output switch is located between the pulse rectifier transformer and the current protection module. And / or, the ice melting protection device further comprises an AC input switch, the AC input switch is arranged on the ice melting protection circuit, and the AC input switch is located between the pulse rectifier transformer and the current protection module.
[0014] Through the above technical solution, the UHV ground wire ice melting system provided by the embodiment of the present application has the following beneficial effects: In the technical solution of the present application, the UHV ground wire ice melting system sets the current protection module between the AC output device and the DC output device, so that the current protection module can quickly disconnect the ice melting protection circuit according to the detected short-circuit fault information in the case of a short-circuit fault, effectively preventing the short-circuit current from breaking through the AC output device and causing damage to the AC output device, thereby playing a protective role for the AC output device. In addition, the UHV ground wire ice melting system sets the bypass switch in parallel with the current protection module, so that even in the case of a short-circuit fault, AC power can be input to the DC output device through the closed bypass switch, effectively preventing the short-circuit fault from causing ice melting failure, realizing non-stop ice melting of the UHV ground wire, ensuring normal power transmission during the ice melting process, and meeting the needs of fast protection and reliable ice melting of the UHV ground wire in the case of a short-circuit fault.
[0015] Other features and advantages of the present application will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS
[0016] The accompanying drawings are included to provide a further understanding of the embodiments of the application, and constitute a part of the specification, and are used together with the following detailed description to explain the embodiments of the application, but do not constitute a limitation on the embodiments of the application. For those skilled in the art, other drawings can be obtained from the structures shown in the drawings without creative labor. In the drawings: Figure 1is a structural schematic diagram of an UHV ground wire ice melting system according to an embodiment of the present application; Figure 2 is a structural schematic diagram of a DC output device in an UHV ground wire ice melting system according to an embodiment of the present application; Figure 3 is a current ice melting route of a first ice melting and closing scheme in an UHV ground wire ice melting system according to an embodiment of the present application; Figure 4 is a current ice melting route of a second ice melting and closing scheme in an UHV ground wire ice melting system according to an embodiment of the present application; Figure 5 is a structural schematic diagram of an ice melting protection device in an UHV ground wire ice melting system according to an embodiment of the present application; Figure 6 is a structural block diagram of an UHV ground wire ice melting system according to an embodiment of the present application.
[0017] Explanation of reference signs DETAILED DESCRIPTION
[0018] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.
[0019] The UHV ground wire ice melting system of the present application will be described below with reference to the accompanying drawings.
[0020] As shown in Figure 1 , the present application provides an UHV ground wire ice melting system, which comprises an AC output device 10, a DC output device 20 and an ice melting protection device 30, the DC output device 20 is used to be connected with a ground wire 200, the ice melting protection device 30 comprises a current protection module 31, a bypass switch 32 and an ice melting protection circuit 33, the AC output device 10 is connected with the DC output device 20 through the ice melting protection circuit 33, the current protection module 31 is arranged on the ice melting protection circuit 33 and is used to detect short-circuit fault information and disconnect the ice melting protection circuit 33 according to the short-circuit fault information, and the bypass switch 32 is arranged in parallel with the current protection module 31.
[0021] Specifically, the alternating current output device 10 is used to output alternating current, and the alternating current output by the alternating current output device 10 is input to the direct current output device 20 through the ice melting protection line 33, the direct current output device 20 is used to convert the alternating current into direct current and output to the ground wire 200 to realize ice melting of the ground wire 200; in the case of a transient short-circuit fault of the ground wire 200, the current protection module 31 arranged on the ice melting protection line 33 can detect short-circuit fault information and disconnect the ice melting protection line 33 according to the detected short-circuit fault information, so that the short-circuit current cannot be transmitted from the ground wire 200 to the alternating current output device 10 through the direct current output device 20 and the ice melting protection line 33, effectively preventing the alternating current output device 10 from being damaged when a short-circuit fault occurs, and in the case of needing to melt ice of the ground wire 200, the bypass switch 32 connected in parallel with the current protection module 31 is closed, so that the alternating current output by the alternating current output device 10 can be input to the direct current output device 20 through the bypass switch 32, and then the direct current output device 20 converts the alternating current into direct current and outputs to the ground wire 200 for ice melting, thereby ensuring the reliability of the ice melting of the ground wire 200.
[0022] The ultra-high voltage ground wire ice melting system of the embodiment of the present application sets the current protection module 31 between the alternating current output device 10 and the direct current output device 20, so that in the case of a short-circuit fault, the current protection module 31 can quickly disconnect the ice melting protection line 33 according to the detected short-circuit fault information, effectively preventing the short-circuit current from breaking through the alternating current output device 10 and causing damage to the alternating current output device 10, thereby protecting the alternating current output device 10, and the ultra-high voltage ground wire ice melting system sets the bypass switch 32 connected in parallel with the current protection module 31, so that even in the case of a short-circuit fault, the alternating current can be input to the direct current output device 20 through the closed bypass switch 32, effectively preventing the short-circuit fault from causing ice melting failure, realizing non-power-off ice melting of the ultra-high voltage ground wire 200, ensuring normal power transmission during the ice melting process, and meeting the requirements of fast protection and reliable ice melting of the ultra-high voltage ground wire 200 in the case of a short-circuit fault.
[0023] As can be understood by those skilled in the art, the voltage range of the ultra-high voltage ground wire 200 in the embodiment of the present application is set to 800kV~1000kV, the short-circuit current of the ultra-high voltage ground wire 200 is large enough to break through and damage the alternating current output device 10 in the case of a short-circuit fault, the current protection module 31 is arranged between the alternating current output device 10 and the direct current output device 20, so that the current protection module 31 can quickly disconnect the ice melting protection line 33 according to the short-circuit fault information to protect the alternating current output device 10 when detecting the short-circuit fault information, wherein the current protection module 31 can be a fuse, a circuit breaker, a current limiting switch, an overcurrent relay or other current protection modules that can detect short-circuit fault information and disconnect the ice melting protection line 33, all of which should belong to the protection scope of the present application.
[0024] In the embodiment of the present application, the short-circuit fault information is configured to at least include the line current, the ice-melting protection device 30 further comprises a controller 34, the controller 34 is in communication connection with the current protection module 31, and the controller 34 is configured to: generating a short-circuit fault warning signal in the case of determining that the line current is in the first preset current range; generating a short-circuit fault warning signal in the case of determining that the line current is in the second preset current range; wherein any value in the first preset current range is less than any value in the second preset current range.
[0025] Specifically, the current protection module 31 is configured to detect the line current of the ice-melting protection line 33, and the current protection module 31 sends the detection result to the controller 34 in the case of detecting that the line current is in the first preset current range, the controller 34 receives the detection result of the current protection module 31 and determines that the line current is in the first preset current range, so that the controller 34 can generate a short-circuit fault warning signal to prompt the ice-melting operator, so that the ice-melting operator can grasp the system situation in time according to the short-circuit fault warning signal and make good short-circuit fault non-power-off ground wire 200 ice-melting preparation, thereby improving the system reliability; and the current protection module 31 can send the detection result to the controller 34 in the case of detecting that the line current is in the second preset current range, the controller 34 receives the detection result of the current protection module 31 and determines that the line current is in the second preset current range, so that the controller 34 generates a short-circuit fault warning signal to prompt the ice-melting operator, so that the ice-melting operator can determine that a line short-circuit fault occurs according to the short-circuit fault warning signal, thereby facilitating the grasping of fault conditions and fault information, and improving the ice-melting reliability.
[0026] Further, the first preset current range can be set to be above 800A and less than 1600A, and the second preset coverage range can be set to be above 1600A, the first preset current range and the second preset current range can be flexibly set according to actual use requirements, and the embodiment of the present application does not limit the first preset current range and the second preset current range, and the current protection module 31 is configured to disconnect the ice-melting protection line 33 in the case of detecting that the line current is in the second preset current range, so as to play a role in protecting the alternating current output device 10.
[0027] In the embodiment of the present application, the AC output device 10 comprises a power supply 11, a pulse rectifier transformer 12 and an AC output line 13, the pulse rectifier transformer 12 is arranged on the AC output line 13, and the AC output line 13 is connected with the power supply 11 and the ice-melting protection line 33 respectively. In addition, the DC output device 20 comprises a pulse rectifier 21 and a DC output line 22, the pulse rectifier 21 is connected with the ice-melting protection line 33, and the DC output line 22 is connected with the pulse rectifier 21 and the ground wire 200 respectively.
[0028] As shown in Figure 1 , the AC output line 13 is connected with the DC output line 22 through the ice-melting protection line 33, the power supply 11 is used to provide 10kV AC and input to the AC output line 13, the pulse rectifier transformer 12 on the AC output line 13 is used to convert 10kV AC into multi-gear AC of 500kV, 800kV or other voltage levels, the AC converted by the pulse rectifier transformer 12 is output to the DC output line 22 through the ice-melting protection line 33 or the bypass switch 32, and the pulse rectifier 21 on the DC output line 22 is used to convert AC into DC and input to the ground wire 200 for ice-melting, thereby realizing reliable ice-melting of the ground wire 200.
[0029] In the embodiment of the present application, the pulse rectifier 21 comprises a first rectifier module 211 and a second rectifier module 212, the first rectifier module 211 and the second rectifier module 212 are connected with the ice-melting protection line 33 respectively, the DC output line 22 comprises a positive connection line 221, a negative connection line 222 and a terminal output line 223, the terminal output line 223 is connected with the ground wire 200, one end of the positive connection line 221 is connected with the terminal output line 223, and the other end of the positive connection line 221 is branched and connected with the first rectifier module 211 and the second rectifier module 212 one by one, one end of the negative connection line 222 is connected with the terminal output line 223, and the other end of the negative connection line 222 is branched and connected with the first rectifier module 211 and the second rectifier module 212 one by one.
[0030] As shown in Figure 1 and Figure 2As shown, the pulse rectification transformer 12 is provided with a double winding, and the pulse rectifier 21 can be a 12-pulse rectifier in the prior art. The pulse rectifier 21 comprises a first rectification module 211 and a second rectification module 212. The first rectification module 211 and the second rectification module 212 are respectively connected with the terminal output line 223 through the positive connection line 221 and the negative connection line 222. The terminal output line 223 is connected with the ground wire 200, so that the first rectification module 211 and the second rectification module 212 can output the converted direct current to the ground wire 200 through the positive connection line 221, the negative connection line 222 and the terminal output line 223 for direct current ice melting.
[0031] In the embodiment of the present application, the positive connection line 221 comprises a positive main line 2211, a first positive branch line 2212 and a second positive branch line 2213. One end of the positive main line 2211 is connected with the terminal output line 223, and the other end of the positive main line 2211 is branched and connected with the first positive branch line 2212 and the second positive branch line 2213 one by one. The first positive branch line 2212 is connected with the first rectification module 211 and is provided with a first direct current switching knife switch 2214. The second positive branch line 2213 is connected with the second rectification module 212 and is provided with a first series-parallel switching knife switch 2215. The negative connection line 222 comprises a negative main line 2221, a first negative branch line 2222 and a second negative branch line 2223. One end of the negative main line 2221 is connected with the terminal output line 223, and the other end of the negative main line 2221 is branched and connected with the first negative branch line 2222 and the second negative branch line 2223 one by one. The first negative branch line 2222 is connected with the first rectification module 211 and is provided with a second series-parallel switching knife switch 2224. The second negative branch line 2223 is connected with the second rectification module 212 and is provided with a second direct current switching knife switch 2225.
[0032] Specifically, when the ground wire 200 needs to be melted, the first direct current switching knife switch 2214, the second direct current switching knife switch 2225, the first series-parallel switching knife switch 2215 and the second series-parallel switching knife switch 2224 are closed, so that the converted direct current of the first rectification module 211 and the second rectification module 212 can be output to the ground wire 200 along the current ice melting route as shown for ice melting. Figure 3
[0033] Further, the direct current output line 22 further comprises a series-parallel switching line 224. Two ends of the series-parallel switching line 224 are respectively connected with the second positive branch line 2213 and the first negative branch line 2222 one by one, and the series-parallel switching line 224 is provided with a third series-parallel switching knife switch 2241.
[0034] Specifically, when the de-icing operation of the ground wire 200 needs to be performed, the first DC switching knife switch 2214, the second DC switching knife switch 2225, the first series-parallel switching knife switch 2215, and the second series-parallel switching knife switch 2224 are closed, and the third series-parallel switching knife switch 2241 is opened, so that the converted DC electric energy of the first rectifier module 211 and the second rectifier module 212 is output to the ground wire 200 along the current de-icing route as shown in the figure for de-icing, which is suitable for de-icing the ground wire 200 when the ice thickness on the ground wire is small. Figure 3 In addition, the first DC switching knife switch 2214, the second DC switching knife switch 2225, and the third series-parallel switching knife switch 2241 can be closed, and the first series-parallel switching knife switch 2215 and the second series-parallel switching knife switch 2224 can be opened, so that the converted DC electric energy of the first rectifier module 211 and the second rectifier module 212 is output to the ground wire 200 along the current de-icing route as shown in the figure for de-icing, which is suitable for de-icing the ground wire 200 when the ice thickness on the ground wire is large. Figure 4 In addition, the first DC switching knife switch 2214, the second DC switching knife switch 2225, and the third series-parallel switching knife switch 2241 can be closed, and the first series-parallel switching knife switch 2215 and the second series-parallel switching knife switch 2224 can be opened, so that the converted DC electric energy of the first rectifier module 211 and the second rectifier module 212 is output to the ground wire 200 along the current de-icing route as shown in the figure for de-icing, which is suitable for de-icing the ground wire 200 when the ice thickness on the ground wire is large.
[0035] In the embodiment of the present application, the controller 34 is further configured to: select the first de-icing closing scheme when it is determined that the ground wire 200 is in a light icing state; select the second de-icing closing scheme when it is determined that the ground wire 200 is in a heavy icing state; The first de-icing closing scheme is configured to close the first DC switching knife switch 2214, the second DC switching knife switch 2225, the first series-parallel switching knife switch 2215, and the second series-parallel switching knife switch 2224, and open the third series-parallel switching knife switch 2241. The second de-icing closing scheme is configured to close the first DC switching knife switch 2214, the second DC switching knife switch 2225, and the third series-parallel switching knife switch 2241, and open the first series-parallel switching knife switch 2215 and the second series-parallel switching knife switch 2224.
[0036] Specifically, the controller 34 can prompt the de-icing operation personnel to select the first de-icing closing scheme or the second de-icing closing scheme according to the icing state of the ground wire 200, that is, prompt the de-icing operation personnel to select the first de-icing closing scheme when the ground wire 200 is in a light icing state, and prompt the de-icing operation personnel to select the second de-icing closing scheme when the ground wire 200 is in a heavy icing state, thereby improving the electric energy utilization rate and reducing the power consumption while ensuring the de-icing reliability.
[0037] Further, as shown in Figure 6As shown, the UHV ground wire ice melting system further comprises a display 40, the display 40 is in communication connection with the controller 34, the controller 34 transmits the selected first ice melting closing scheme to the display 40 in the case of determining that the ground wire 200 is in a light icing state, so that the display 40 can display the first ice melting closing scheme, and the controller 34 transmits the selected second ice melting closing scheme to the display 40 in the case of determining that the ground wire 200 is in a heavy icing state, so that the display 40 can display the second ice melting closing scheme, the ice melting operation personnel can select the appropriate ice melting closing scheme according to the display content of the display 40, which further improves the ice melting reliability and facilitates the ice melting operation personnel to operate the closing according to the actual icing condition.
[0038] In the embodiment of the present application, as shown in the figure, Figure 6 The ice melting protection device 30 further comprises an audible and visual warning device 37, the audible and visual warning device 37 is in communication connection with the controller 34, the controller 34 can send the generated short-circuit fault early warning signal and short-circuit fault warning signal to the audible and visual warning device 37, so that the audible and visual warning device 37 issues the corresponding short-circuit fault early warning signal or short-circuit fault warning signal, thereby prompting the ice melting operation personnel, which is sensitive and reliable, facilitates the ice melting operation personnel to grasp the system condition in time, and the controller 34 can also send the generated short-circuit fault early warning signal and short-circuit fault warning signal to the display 40, so that the ice melting operation personnel can grasp the short-circuit fault condition in time according to the display content of the display 40, which further improves the system operation and maintenance reliability.
[0039] In the embodiment of the present application, the UHV ground wire ice melting system further comprises an icing detection device 35, the icing detection device 35 is in communication connection with the controller 34 and is used for detecting the ground wire icing thickness, and the controller 34 is further configured to: determine that the ground wire 200 is in a light icing state in the case of determining that the ground wire icing thickness is in a first preset thickness range; determine that the ground wire 200 is in a heavy icing state in the case of determining that the ground wire icing thickness is in a second preset thickness range; wherein any value in the first preset thickness range is less than any value in the second preset thickness range.
[0040] Specifically, the icing detection device 35 can detect the icing thickness of the ground wire 200 and send the detection result to the controller 34, the controller 34 receives the ground wire icing thickness detection result, and determines whether the ground wire icing thickness is in the first preset thickness range or in the second preset thickness range according to the ground wire icing thickness, and then determines that the ground wire 200 is in a light icing state or a heavy icing state, and selects the corresponding ice melting closing scheme to send to the display 40 to prompt the ice melting operation personnel, which improves the use convenience and user experience.
[0041] Further, the first preset thickness range can be set to be greater than 5mm and less than 8mm, the second preset thickness range can be set to be greater than 10mm, and the first preset thickness range and the second preset thickness range can be flexibly set according to actual use requirements, and the embodiment of the present application does not limit the first preset thickness range and the second preset thickness range.
[0042] In the embodiment of the present application, the controller 34 is further configured to determine that the ground wire 200 is in a moderate icing state when it is determined that the ground wire icing thickness is in a third preset thickness range, and select the first ice-melting closing scheme or the second ice-melting closing scheme when it is determined that the ground wire 200 is in the moderate icing state.
[0043] Specifically, the third preset thickness range can be set to be greater than 8mm and less than 10mm, and the third preset thickness range can be flexibly set according to actual use requirements, and the embodiment of the present application does not limit the third preset thickness range; the icing detection device 35 sends the detection result to the controller 34 when it is detected that the ground wire icing thickness is in the third preset thickness range, the controller 34 determines that the ground wire 200 is in the moderate icing state according to the third preset thickness range, and the first ice-melting closing scheme and the second ice-melting closing scheme are both sent to the display 40 when the ground wire 200 is in the moderate icing state, so that the ice-melting operating personnel can flexibly select the first ice-melting closing scheme or the second ice-melting closing scheme according to the actual situation, for example, the second ice-melting closing scheme is selected to shorten the ice-melting time in the case of urgent ice-melting, and the first ice-melting closing scheme is selected to save energy consumption in the case of insufficient power, thereby further improving the system use convenience and intelligence.
[0044] In the embodiment of the present application, the alternating current output device 10 further comprises an alternating current output knife switch 14, the alternating current output knife switch 14 is arranged on the alternating current output line 13, and the alternating current output knife switch 14 is located between the pulse rectifier transformer 12 and the current protection module 31; the ice-melting protection device 30 further comprises an alternating current input knife switch 36, the alternating current input knife switch 36 is arranged on the ice-melting protection line 33, and the alternating current input knife switch 36 is located between the pulse rectifier transformer 12 and the current protection module 31.
[0045] As shown in Figure 1 When the ground wire 200 ice-melting operation is needed, the alternating current output knife switch 14 is closed to make the pulse rectifier transformer 12 output the converted alternating current to the ice-melting protection line 33, and the alternating current input knife switch 36 is closed to make the pulse rectifier transformer 12 converted alternating current energy input to the direct current output line 22 through the ice-melting protection line 33 or the bypass knife switch 32, thereby further improving the ice-melting safety and reliability.
[0046] In the embodiment of the present application, as shown in Figure 1As shown, the AC output line 13 includes an AC output main line 131 and two AC output branch lines 132, the AC output main line 131 is connected with the power supply 11 and the pulse rectifier transformer 12 respectively, so that the power supply 11 can input 10kV AC power to the pulse rectifier transformer 12, the pulse rectifier transformer 12 has two-phase windings, and the two AC output branch lines 132 are connected with the two-phase windings of the pulse rectifier transformer 12 one by one and are connected with the ice-melting protection line 33, so that the pulse rectifier transformer 12 can output the converted AC power to the ice-melting protection line 33 through the two AC output branch lines 132 respectively.
[0047] Further, the controller 34 is further configured to: determine that the ground wire 200 is in a light icing state, control the pulse rectifier transformer 12 to output first-grade AC power; determine that the ground wire 200 is in a heavy icing state, control the pulse rectifier transformer 12 to output second-grade AC power; determine that the ground wire 200 is in a moderate icing state, control the pulse rectifier transformer 12 to output the first-grade AC power or the second-grade AC power according to the voltage output instruction.
[0048] Specifically, the first-grade AC power can be set as 500kV AC power, the second-grade AC power can be set as 800kV AC power, the first-grade AC power and the second-grade AC power can be flexibly set according to actual use requirements, and the specific voltage values of the first-grade AC power and the second-grade AC power are not limited in the embodiment of the application; the controller 34 can flexibly control the output voltage of the pulse rectifier transformer 12 according to the icing state of the ground wire 200, so as to further improve the power utilization rate and reduce the power consumption while ensuring the reliability of ice melting; and the ultra-high voltage ground wire ice-melting system further includes an operating table or an operating panel in communication connection with the controller 34, the operating table or the operating panel is used for manually setting the voltage output instruction, and the controller 34 can acquire the manually set voltage output instruction, so as to control the AC power voltage value output by the pulse rectifier transformer 12 according to the voltage output instruction in the case that the ground wire 200 is in a moderate icing state, the operation is flexible and convenient, and it is convenient for the ice-melting operation personnel to flexibly control the pulse rectifier transformer 12 according to the actual icing condition, thereby further improving the system use convenience and use experience.
[0049] In the embodiment of the application, as shown in Figure 1 and Figure 5As shown, the number of ice-melting protection lines 33 is set to two, and the two ice-melting protection lines 33 are respectively arranged in one-to-one correspondence with the first rectifying module 211 and the second rectifying module 212, and each ice-melting protection line 33 includes three ice-melting protection branch lines 331, and each ice-melting protection branch line 331 is provided with a current protection module 31 and a bypass knife switch 32 arranged in parallel with the current protection module 31, that is, the number of current protection modules 31 and the number of bypass knife switches 32 are consistent with and arranged in one-to-one correspondence with the number of ice-melting protection branch lines 331, further improving the ground wire 200 short-circuit fault fast protection and reliable ice-melting stability and reliability.
[0050] In the description of the present application, it should be understood that the terms "first", "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.
[0051] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and other terms should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0052] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.
[0053] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.
Claims
1. An ultra-high voltage ground wire de-icing system, characterized in that, The extra-high voltage ground wire ice melting system comprises: An alternating current output device (10); A direct current output device (20) for connecting with a ground wire (200); An ice melting protection device (30) comprising a current protection module (31), a bypass switch (32) and an ice melting protection circuit (33), the alternating current output device (10) is connected with the direct current output device (20) through the ice melting protection circuit (33), the current protection module (31) is arranged on the ice melting protection circuit (33) and is used for detecting short circuit fault information and breaking the ice melting protection circuit (33) according to the short circuit fault information, and the bypass switch (32) is arranged in parallel with the current protection module (31).
2. The UHV ground wire de-icing system of claim 1, wherein, The short circuit fault information is configured to at least include a line current, and the ice melting protection device (30) further comprises a controller (34) in communication connection with the current protection module (31), and the controller (34) is configured to: generate a short circuit fault early warning signal when it is determined that the line current is within a first preset current range; generate a short circuit fault warning signal when it is determined that the line current is within a second preset current range; wherein any value within the first preset current range is less than any value within the second preset current range.
3. The UHV ground wire de-icing system of claim 2, wherein, The direct current output device (20) comprises a pulse rectifier (21) and a direct current output circuit (22), the pulse rectifier (21) is connected with the ice melting protection circuit (33), and the direct current output circuit (22) is connected with the pulse rectifier (21) and the ground wire (200) respectively.
4. The UHV ground wire de-icing system of claim 3, wherein, The pulse rectifier (21) comprises a first rectification module (211) and a second rectification module (212), the first rectification module (211) and the second rectification module (212) are connected with the ice melting protection circuit (33) respectively, the direct current output circuit (22) comprises a positive connection line (221), a negative connection line (222) and a terminal output line (223), the terminal output line (223) is connected with the ground wire (200), one end of the positive connection line (221) is connected with the terminal output line (223), and the other end of the positive connection line (221) is branched and connected with the first rectification module (211) and the second rectification module (212) one by one, one end of the negative connection line (222) is connected with the terminal output line (223), and the other end of the negative connection line (222) is branched and connected with the first rectification module (211) and the second rectification module (212) one by one.
5. The UHV ground wire de-icing system of claim 4, wherein, The positive electrode connecting line (221) comprises a positive electrode main line (2211), a first positive electrode branch line (2212) and a second positive electrode branch line (2213), one end of the positive electrode main line (2211) is connected with the terminal output line (223), and the other end of the positive electrode main line (2211) is branched and connected with the first positive electrode branch line (2212) and the second positive electrode branch line (2213) one by one, the first positive electrode branch line (2212) is connected with the first rectifier module (211) and is provided with a first direct current switching knife switch (2214), and the second positive electrode branch line (2213) is connected with the second rectifier module (212) and is provided with a first series-parallel switching knife switch (2215); The negative electrode connecting line (222) comprises a negative electrode main line (2221), a first negative electrode branch line (2222) and a second negative electrode branch line (2223), one end of the negative electrode main line (2221) is connected with the terminal output line (223), and the other end of the negative electrode main line (2221) is branched and connected with the first negative electrode branch line (2222) and the second negative electrode branch line (2223) one by one, the first negative electrode branch line (2222) is connected with the first rectifier module (211) and is provided with a second series-parallel switching knife switch (2224), and the second negative electrode branch line (2223) is connected with the second rectifier module (212) and is provided with a second direct current switching knife switch (2225).
6. The UHV ground wire de-icing system of claim 5, wherein, The direct current output line (22) further comprises a series-parallel switching line (224), both ends of the series-parallel switching line (224) are connected with the second positive electrode branch line (2213) and the first negative electrode branch line (2222) one by one, and the series-parallel switching line (224) is provided with a third series-parallel switching knife switch (2241).
7. The UHV ground wire de-icing system of claim 6, wherein, The controller (34) is further configured to: In the case of determining that the ground wire (200) is in a light icing state, a first ice-melting closing scheme is selected; In the case of determining that the ground wire (200) is in a heavy icing state, a second ice-melting closing scheme is selected; Wherein, the first ice-melting closing scheme is to close the first direct current switching knife switch (2214), the second direct current switching knife switch (2225), the first series-parallel switching knife switch (2215), the second series-parallel switching knife switch (2224), and open the third series-parallel switching knife switch (2241); the second ice-melting closing scheme is to close the first direct current switching knife switch (2214), the second direct current switching knife switch (2225) and the third series-parallel switching knife switch (2241), and open the first series-parallel switching knife switch (2215) and the second series-parallel switching knife switch (2224).
8. The UHV ground wire de-icing system of claim 7, wherein, The ultra-high voltage ground wire ice-melting system further comprises an icing detection device (35), the icing detection device (35) is in communication connection with the controller (34) and is used for detecting the ground wire icing thickness, and the controller (34) is further configured to: determining that the ground wire (200) is in the heavy icing state when it is determined that the ground wire icing thickness is in a second preset thickness range; wherein any value in the first preset thickness range is less than any value in the second preset thickness range. The AC output device (10) comprises a power supply (11), a pulse rectifier transformer (12) and an AC output line (13), the pulse rectifier transformer (12) is arranged on the AC output line (13), and the AC output line (13) is connected with the power supply (11) and the ice melting protection line (33) respectively.
9. The UHV ground wire de-icing system of any one of claims 1 to 8, wherein, The AC output device (10) further comprises an AC output knife switch (14), the AC output knife switch (14) is arranged on the AC output line (13), and the AC output knife switch (14) is located between the pulse rectifier transformer (12) and the current protection module (31); 10. The UHV ground wire de-icing system of claim 9, wherein, And / or, the ice melting protection device (30) further comprises an AC input knife switch (36), the AC input knife switch (36) is arranged on the ice melting protection line (33), and the AC input knife switch (36) is located between the pulse rectifier transformer (12) and the current protection module (31).