An ice-coating monitoring device and method for a power transmission line

Abstract

This application provides an icing monitoring device and method for power transmission lines, relating to the field of circuit technology. The device includes an icing monitoring module and an icing melting module. The icing melting module includes: a first thyristor rectifier bridge, the input of which is connected to an AC power source, and a first output of which is equipped with a first disconnecting switch, used to connect to a first end of the power transmission line via the first disconnecting switch; a second output of which is used to connect to a second end of the power transmission line; and a second thyristor rectifier bridge, the input of which is connected to an AC power source, the first output of which is used to connect to the first end of the power transmission line, and a second output of which is equipped with a second disconnecting switch. This application can reduce the damage rate of related components of power transmission lines.

Description

Technical Field

[0001] This application relates to the field of circuit technology, specifically to an icing monitoring device and method for power transmission lines. Background Technology

[0002] Transmission lines in power grids are prone to icing in low-temperature and high-humidity environments, causing damage to related components (transmission lines or towers, etc.). A related technical document (CN110336235B) discloses an AC transmission DC de-icing device based on a self-melting conductor, including a sending-end A-phase transmission line, a sending-end B-phase transmission line, a sending-end C-phase transmission line, an A-phase transformer module, a B-phase transformer module, a C-phase transformer module, a level conversion module, and A-phase, B-phase, and C-phase thermal conductors. The self-melting conductor is controlled by the transformer module and the level conversion module to perform de-icing when the high-voltage transmission line is in operation. However, this technology requires manual monitoring of icing and determination of whether de-icing is necessary, which can easily lead to untimely de-icing and damage to related components of the power grid transmission lines.

[0003] It is evident that the relevant technologies suffer from a high rate of damage to components related to power transmission lines in the power grid. Summary of the Invention

[0004] This application provides an ice monitoring device and method for power transmission lines to solve the problem of poor ice melting effect in related technologies.

[0005] To achieve the above objectives, embodiments of this application provide an icing monitoring device for transmission lines, comprising:

[0006] An icing monitoring module is used to monitor the icing of transmission lines and obtain icing information of the transmission lines, wherein the icing information is used to characterize the icing status of the transmission lines.

[0007] An ice-melting module, communicatively connected to the icing monitoring module, is used to melt ice on the transmission line. The ice-melting module includes:

[0008] The first thyristor rectifier bridge has an input terminal for connecting to an AC power source, a first output terminal for having a first disconnecting switch, a second output terminal for connecting to a first end of a power transmission line via the first disconnecting switch, and a third output terminal for connecting to a second end of the power transmission line.

[0009] The second thyristor rectifier bridge has an input terminal for connecting to the AC power supply, a first output terminal for connecting to the first end of the transmission line, and a second output terminal for connecting to the second end of the transmission line via the second disconnect switch.

[0010] The third disconnecting switch is used to connect the second end of the first thyristor rectifier bridge to the first end of the second thyristor rectifier bridge.

[0011] When the ice-melting module needs to output a first voltage, the first and second isolating switches are closed, and the third isolating switch is opened.

[0012] When the ice-melting module needs to output a second voltage, the first and second isolating switches are disconnected, the third isolating switch is closed, and the second voltage is greater than the first voltage.

[0013] In one embodiment, a reactor is provided at the first output terminal of the first thyristor rectifier bridge, and the first output terminal of the first thyristor rectifier bridge is connected to the first disconnecting switch through the reactor; and / or,

[0014] The reactor is provided at the second output terminal of the first thyristor rectifier bridge, and the second input terminal of the first thyristor rectifier bridge is used to connect to the second terminal of the transmission line through the reactor; and / or,

[0015] The first output terminal of the second thyristor rectifier bridge is provided with a reactor, and the first output terminal of the first thyristor rectifier bridge is used to connect to the first terminal of the transmission line through the reactor; and / or,

[0016] The second output terminal of the second thyristor rectifier bridge is provided with the reactor, and the second input terminal of the second thyristor rectifier bridge is connected to the second disconnecting switch through the reactor.

[0017] In one embodiment, the icing monitoring device for transmission lines further includes a transformer, which includes a first winding, a second winding and a third winding. The first winding is a delta winding or a Y winding, and the second winding is a delta winding or a Y winding. The second winding and the third winding are windings of different types.

[0018] The first winding is used to connect to the AC power supply, the second winding is connected to the input terminal of the first thyristor rectifier bridge, and the third winding is connected to the input terminal of the second thyristor rectifier bridge.

[0019] In one embodiment, when the AC power supply is a three-phase power supply, the first thyristor rectifier bridge includes three first rectifier arms and three second rectifier arms. The input terminal of each first rectifier arm is used to connect to different phases of the three-phase power supply, and the output terminal of each first rectifier arm is connected to one end of the third disconnecting switch. The output terminal of each first rectifier arm is used to connect to the first end of the transmission line through the first disconnecting switch. The input terminal of each second rectifier arm is used to connect to different phases of the three-phase power supply, and the output terminal of each second rectifier arm is used to connect to the second end of the transmission line.

[0020] When the AC power supply is a three-phase power supply, the second thyristor rectifier bridge includes three third rectifier arms and three fourth rectifier arms. The input terminal of each third rectifier arm is used to connect to different phases of the three-phase power supply, and the output terminal of each third rectifier arm is used to connect to the first end of the transmission line. The input terminal of each fourth rectifier arm is used to connect to different phases of the three-phase power supply, and the output terminal of each fourth rectifier arm is connected to the other end of the third disconnecting switch. The output terminal of each fourth rectifier arm is used to connect to the second end of the transmission line through the second disconnecting switch.

[0021] In one embodiment, each first rectifier arm includes at least one thyristor, each second rectifier arm includes at least one thyristor, each third rectifier arm includes at least one thyristor, and each fourth rectifier arm includes at least one thyristor.

[0022] In one embodiment, where each first rectifier arm includes a thyristor, the input terminal of the thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the thyristor is connected to the first disconnect switch and the third disconnect switch; and / or,

[0023] In the case where each second rectifier arm includes a thyristor, the input terminal of the thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the thyristor is used to connect to the second terminal of the transmission line; and / or,

[0024] In the case where each third rectifier arm includes a thyristor, the input terminal of the thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the thyristor is used to connect to the first terminal of the transmission line; and / or,

[0025] In the case where each fourth rectifier arm includes a thyristor, the input terminal of the thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the thyristor is connected to the second disconnecting switch and the third disconnecting switch.

[0026] In one embodiment, when each first rectifier arm includes at least two thyristors, the at least two thyristors are connected in series, and the input terminals of the at least two thyristors connected in series are used to connect to different phases of the three-phase power supply, and the output terminals of the at least two thyristors connected in series are connected to the first disconnect switch and the third disconnect switch; and / or,

[0027] In the case where each second rectifier arm includes a thyristor, at least two thyristors are connected in series, and the input terminal of the series-connected thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the series-connected thyristor is used to connect to the second terminal of the transmission line; and / or,

[0028] In the case where each third rectifier arm includes a thyristor, at least two thyristors are connected in series, and the input terminal of the series-connected thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the series-connected thyristor is used to connect to the first terminal of the transmission line; and / or,

[0029] In the case where each fourth rectifier arm includes a thyristor, at least two thyristors are connected in series, and the input terminal of the series-connected thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the series-connected thyristor is connected to the second disconnecting switch and the third disconnecting switch.

[0030] This application embodiment also provides a method for monitoring icing on transmission lines, applied to the aforementioned icing monitoring device for transmission lines, comprising:

[0031] The icing of the transmission line is monitored to obtain icing information of the transmission line, and the icing information is used to characterize the icing status of the transmission line.

[0032] When the icing information meets the preset conditions, the transmission line is de-iced using an ice-melting module.

[0033] In one embodiment, the icing information includes at least one of icing thickness and icing weight;

[0034] The preset conditions include at least one of the following:

[0035] The ice thickness exceeds the preset thickness threshold.

[0036] The weight of the ice layer exceeds the preset weight threshold.

[0037] One of the above technical solutions has the following advantages or beneficial effects:

[0038] In this embodiment, the icing monitoring device for transmission lines includes: an icing monitoring module for monitoring icing on the transmission line and obtaining icing information of the transmission line, the icing information being used to characterize the icing status of the transmission line; and an ice-melting module, which is communicatively connected to the icing monitoring module and is used to melt the ice on the transmission line. The ice-melting module includes: a first thyristor rectifier bridge, the input terminal of which is connected to an AC power supply, and a first output terminal of which is provided with... The first disconnecting switch connects the first output terminal of the first thyristor rectifier bridge to the first end of the transmission line, and the second output terminal connects to the second end of the transmission line. The second thyristor rectifier bridge connects the input terminal to an AC power source, the first output terminal connects to the first end of the transmission line, and the second output terminal is equipped with a second disconnecting switch, which connects to the second end of the transmission line. This allows the icing monitoring module to quickly determine if de-icing is necessary, and the de-icing module then performs timely de-icing, reducing the damage rate of related components of the transmission line. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a structural diagram of the icing monitoring device for power transmission lines provided in the embodiments of this application;

[0041] Figure 2 This is a schematic diagram of the ice-melting module provided in an embodiment of this application;

[0042] Figure 3 This is a schematic diagram of a thyristor rectifier bridge in related technologies;

[0043] Figure 4 This is one of the schematic diagrams of the icing monitoring method for transmission lines provided in the embodiments of this application;

[0044] Figure 5 This is the second schematic diagram of the icing monitoring method for power transmission lines provided in the embodiments of this application. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] like Figures 1 to 2 As shown, this application embodiment provides an icing monitoring device for transmission lines, including:

[0047] The icing monitoring module 101 is used to monitor the icing of the transmission line and obtain the icing information of the transmission line, wherein the icing information is used to characterize the icing status of the transmission line.

[0048] An ice-melting module 102 is communicatively connected to the icing monitoring module 101. The ice-melting module 102 is used to melt ice on the transmission line. The ice-melting module 102 includes:

[0049] The first thyristor rectifier bridge has an input terminal for connecting to an AC power source and a first output terminal for having a first disconnecting switch S1. The first output terminal of the first thyristor rectifier bridge is used to connect to the first end of a power transmission line via the first disconnecting switch S1, and the second output terminal of the first thyristor rectifier bridge is used to connect to the second end of the power transmission line.

[0050] The second thyristor rectifier bridge has an input terminal for connecting to the AC power supply, a first output terminal for connecting to the first end of the transmission line, and a second output terminal for connecting to the second end of the transmission line via the second disconnect switch S2.

[0051] The third isolating switch S3 connects the second end of the first thyristor rectifier bridge to the first end of the second thyristor rectifier bridge.

[0052] When the ice-melting module 102 needs to output a first voltage, the first isolation switch S1 and the second isolation switch S2 are closed, and the third isolation switch S3 is opened.

[0053] When the ice-melting module 102 needs to output a second voltage, the first isolation switch S1 and the second isolation switch S2 are disconnected, the third isolation switch S3 is closed, and the second voltage is greater than the first voltage.

[0054] The aforementioned first disconnecting switch S1, second disconnecting switch S2, and third disconnecting switch S3 are used to control the connection method between the first thyristor rectifier bridge and the second thyristor rectifier bridge. Specifically, when a smaller output voltage (i.e., the first voltage) is required from the ice-melting device, the first and second thyristor rectifier bridges are connected in parallel. In this case, the third disconnecting switch S3 is open, and the first and second disconnecting switches S1 and S2 are closed. When a larger output voltage (i.e., the second voltage) is required from the ice-melting device, the first and second thyristor rectifier bridges are connected in series. In this case, the third disconnecting switch S3 is closed, and the first and second disconnecting switches S1 and S2 are open. The first disconnecting switch S1, second disconnecting switch S2, and third disconnecting switch S3 enable the switching between the series and parallel connections of the first and second thyristor rectifier bridges to achieve different output voltages.

[0055] It should be noted that by connecting the first thyristor rectifier bridge and the second thyristor rectifier bridge in series or in parallel, relative to Figure 3 The two thyristor rectifier bridges shown (e.g., the first thyristor rectifier bridge and the second thyristor rectifier bridge are connected in series) can provide different voltages for de-icing, thus flexibly adapting to different wire de-icing needs.

[0056] In this embodiment, the icing monitoring device for transmission lines includes: an icing monitoring module 101, used to monitor the icing of the transmission line and obtain icing information of the transmission line, the icing information being used to characterize the icing status of the transmission line; and an ice melting module 102, the ice melting module 102 being communicatively connected to the icing monitoring module 101, the ice melting module 102 being used to melt the ice on the transmission line, wherein the ice melting module 102 includes: a first thyristor rectifier bridge, the input terminal of the first thyristor rectifier bridge being used to connect to an AC power supply, and the first... The output terminal is equipped with a first isolating switch S1. The first output terminal of the first thyristor rectifier bridge is used to connect to the first end of the transmission line through the first isolating switch S1, and the second output terminal of the first thyristor rectifier bridge is used to connect to the second end of the transmission line. A second thyristor rectifier bridge has an input terminal for connecting to an AC power source. The first output terminal of the first thyristor rectifier bridge is used to connect to the first end of the transmission line, and the second output terminal of the second thyristor rectifier bridge is equipped with a second isolating switch S2. The second output terminal of the second thyristor rectifier bridge is used to connect to the second end of the transmission line through the second isolating switch S2. In this way, the icing monitoring module monitors the icing of the transmission line to quickly determine whether de-icing is needed. Then, the de-icing module de-ices the transmission line, achieving timely de-icing and reducing the damage rate of related components of the transmission line. Meanwhile, when the de-icing module 102 needs to output a first voltage, the first disconnecting switch S1 and the second disconnecting switch S2 are closed, and the third disconnecting switch S3 is open; when the de-icing module 102 needs to output a second voltage, the first disconnecting switch S1 and the second disconnecting switch S2 are open, and the third disconnecting switch S3 is closed. The second voltage is greater than the first voltage. The series and parallel switching of the first thyristor rectifier bridge and the second thyristor rectifier bridge are realized through the first disconnecting switch S1, the second disconnecting switch S2 and the third disconnecting switch S3 to output different voltages, thereby adapting to different types of wires and improving the de-icing effect of the wires.

[0057] In one embodiment, a reactor L is provided at the first output terminal of the first thyristor rectifier bridge, and the first output terminal of the first thyristor rectifier bridge is connected to the first disconnecting switch S1 through the reactor L; and / or,

[0058] The reactor L is provided at the second output terminal of the first thyristor rectifier bridge, and the second input terminal of the first thyristor rectifier bridge is used to connect to the second terminal of the transmission line through the reactor L; and / or,

[0059] The first output terminal of the second thyristor rectifier bridge is provided with a reactor L, and the first output terminal of the first thyristor rectifier bridge is used to connect to the first terminal of the transmission line through the reactor L; and / or,

[0060] The second output terminal of the second thyristor rectifier bridge is provided with the reactor L, and the second input terminal of the second thyristor rectifier bridge is connected to the second disconnecting switch S2 through the reactor L.

[0061] It should be noted that during the process of converting AC to DC through the first thyristor rectifier bridge and / or the second thyristor rectifier bridge, DC harmonics are generated. To reduce the harmonics of the de-icing device, in this embodiment, the first output terminal of the first thyristor rectifier bridge is connected to the first disconnecting switch S1 through a reactor L; and / or, the second output terminal of the first thyristor rectifier bridge is provided with a reactor L, and the second input terminal of the first thyristor rectifier bridge is used to connect to the second end of the transmission line through the reactor L; and / or, the first output terminal of the second thyristor rectifier bridge is provided with a reactor L, and the first output terminal of the first thyristor rectifier bridge is used to connect to the first end of the transmission line through the reactor L; and / or, the second output terminal of the second thyristor rectifier bridge is provided with a reactor L, and the second input terminal of the second thyristor rectifier bridge is connected to the second disconnecting switch S2 through the reactor L, thereby reducing the harmonics of DC in the de-icing device of the transmission line.

[0062] In one embodiment, the power transmission line de-icing device further includes a transformer T, which includes a first winding, a second winding and a third winding. The first winding is a delta winding or a Y winding, and the second winding is a delta winding or a Y winding. The second winding and the third winding are windings of different types.

[0063] The first winding is used to connect to the AC power supply, the second winding is connected to the input terminal of the first thyristor rectifier bridge, and the third winding is connected to the input terminal of the second thyristor rectifier bridge.

[0064] The aforementioned transformer T is used to control the voltage of the AC power input to the first thyristor rectifier bridge and the second thyristor rectifier bridge. The transformer T includes a first winding, a second winding and a third winding, which are used to connect the AC power supply, the first thyristor rectifier bridge and the second thyristor rectifier bridge respectively. The transformed AC power is input to the first thyristor rectifier bridge and the second thyristor rectifier bridge through the first winding, the second winding and the third winding.

[0065] The first, second, and third windings can be delta windings or Y-type windings. The second winding is used to connect to the input terminal of the first thyristor rectifier bridge, and the third winding is used to connect to the input terminal of the second thyristor rectifier bridge. The second winding supplies power to the first thyristor rectifier bridge, and the third winding supplies power to the second thyristor rectifier bridge. The output voltages of the second and third windings are the same.

[0066] Furthermore, to further reduce the harmonics of the AC power supply in the transmission line de-icing device, the second and third windings are of different winding types. For example, if the second winding is a delta winding, the third winding is a Y-type winding; or, if the second winding is a Y-type winding, the third winding is a delta winding. The output voltages of the two windings are the same, but their phases differ by 30°, effectively reducing the harmonics of the AC power supply in the transmission line de-icing device.

[0067] In this embodiment, the power transmission line de-icing device further includes a transformer T, which comprises a first winding, a second winding, and a third winding. The first winding is a delta-shaped winding or a Y-shaped winding, the second winding is a delta-shaped winding or a Y-shaped winding, and the second and third windings are of different types. The first winding is used to connect to an AC power source, the second winding is connected to the input terminal of a first thyristor rectifier bridge, and the third winding is connected to the input terminal of a second thyristor rectifier bridge. Thus, the transformed AC power is input to the first and second thyristor rectifier bridges through the first, second, and third windings, thereby transforming the input AC voltage.

[0068] In one embodiment, when the AC power supply is a three-phase power supply, the first thyristor rectifier bridge includes three first rectifier arms U1 and three second rectifier arms U2. The input terminal of each first rectifier arm U1 is used to connect to different phases of the three-phase power supply, and the output terminal of each first rectifier arm U1 is connected to one end of the third disconnecting switch S3. The output terminal of each first rectifier arm U1 is used to connect to the first end of the transmission line through the first disconnecting switch S1. The input terminal of each second rectifier arm U2 is used to connect to different phases of the three-phase power supply, and the output terminal of each second rectifier arm U2 is used to connect to the second end of the transmission line.

[0069] When the AC power supply is a three-phase power supply, the second thyristor rectifier bridge includes three third rectifier arms U3 and three fourth rectifier arms U4. The input terminal of each third rectifier arm U3 is used to connect to different phases of the three-phase power supply, and the output terminal of each third rectifier arm U3 is used to connect to the first end of the transmission line. The input terminal of each fourth rectifier arm U4 is used to connect to different phases of the three-phase power supply, and the output terminal of each fourth rectifier arm U4 is connected to the other end of the third disconnecting switch S3. The output terminal of each fourth rectifier arm U4 is used to connect to the second end of the transmission line through the second disconnecting switch S2.

[0070] The three first rectifier arms U1 are connected to three phases of the three-phase power supply, the three second rectifier arms U2 are connected to three phases of the three-phase power supply, the three third rectifier arms U3 are connected to three phases of the three-phase power supply, and the four second rectifier arms U2 are connected to three phases of the three-phase power supply, so as to provide AC voltage to each first rectifier arm U1, second rectifier arm U2, third rectifier arm U3 and fourth rectifier arm U4 through the three-phase power supply, and each first rectifier arm U1, second rectifier arm U2, third rectifier arm U3 and fourth rectifier arm U4 converts AC power into DC power.

[0071] Each of the first rectifier arm U1, the second rectifier arm U2, the third rectifier arm U3, and the fourth rectifier arm U4 includes a thyristor, which is used to convert alternating current into direct current.

[0072] In this embodiment, when the AC power supply is a three-phase power supply, the first thyristor rectifier bridge includes three first rectifier arms U1 and three second rectifier arms U2. The input terminal of each first rectifier arm U1 is used to connect to different phases of the three-phase power supply, and the output terminal of each first rectifier arm U1 is connected to one end of the third disconnecting switch S3. The output terminal of each first rectifier arm U1 is used to connect to the first end of the transmission line through the first disconnecting switch S1. The input terminal of each second rectifier arm U2 is used to connect to different phases of the three-phase power supply, and the output terminal of each second rectifier arm U2 is used to connect to the first end of the transmission line. The second terminal; when the AC power supply is three-phase, the second thyristor rectifier bridge includes three third rectifier arms U3 and three fourth rectifier arms U4. The input terminal of each third rectifier arm U3 is used to connect to different phases of the three-phase power supply, and the output terminal of each third rectifier arm U3 is used to connect to the first terminal of the transmission line. The input terminal of each fourth rectifier arm U4 is used to connect to different phases of the three-phase power supply, and the output terminal of each fourth rectifier arm U4 is connected to the other terminal of the third disconnector switch S3. The output terminal of each fourth rectifier arm U4 is used to connect to the second terminal of the transmission line through the second disconnector switch S2. In this way, AC power is converted into DC power through each first rectifier arm U1, second rectifier arm U2, third rectifier arm U3, and fourth rectifier arm U4.

[0073] In one embodiment, each first rectifier arm U1 includes at least one thyristor, each second rectifier arm U2 includes at least one thyristor, each third rectifier arm U3 includes at least one thyristor, and each fourth rectifier arm U4 includes at least one thyristor.

[0074] In the embodiments of this application, each first rectifier arm U1 includes at least one thyristor, each second rectifier arm U2 includes at least one thyristor, each third rectifier arm U3 includes at least one thyristor, and each fourth rectifier arm U4 includes at least one thyristor, thereby realizing the conversion between AC and DC power through thyristors.

[0075] Furthermore, by setting different numbers of thyristors in each of the first rectifier arm U1, the second rectifier arm U2, the third rectifier arm U3, and the fourth rectifier arm U4, each of the first rectifier arm U1, the second rectifier arm U2, the third rectifier arm U3, and the fourth rectifier arm U4 can output different voltages, thereby improving the flexibility of the ice melting device.

[0076] Each of the first rectifier arm U1, second rectifier arm U2, third rectifier arm U3, and fourth rectifier arm U4 includes at least one thyristor. The voltage of the thyristor is fixed. The number of thyristors in each of the first rectifier arm U1, second rectifier arm U2, third rectifier arm U3, and fourth rectifier arm U4 can be determined based on the required output voltage of the first thyristor rectifier bridge and the second thyristor rectifier bridge. For example, if the first rectifier arm U1 needs to output 8V and the voltage of each thyristor is 2V, then the first rectifier arm U1 contains 4 thyristors.

[0077] In one embodiment, where each first rectifier arm U1 includes a thyristor, the input terminal of the thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the thyristor is connected to the first disconnecting switch S1 and the third disconnecting switch S3; and / or,

[0078] In the case where each second rectifier arm U2 includes a thyristor, the input terminal of the thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the thyristor is used to connect to the second terminal of the transmission line; and / or,

[0079] In the case where each third rectifier arm U3 includes a thyristor, the input terminal of the thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the thyristor is used to connect to the first terminal of the transmission line; and / or,

[0080] In the case where each fourth rectifier arm U4 includes a thyristor, the input terminal of the thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the thyristor is connected to the second disconnecting switch S2 and the third disconnecting switch S3.

[0081] In the embodiments of this application, when each first rectifier arm U1, each second rectifier arm U2, each third rectifier arm U3, or each fourth rectifier arm U4 includes only one thyristor, the thyristor is directly used to connect different phases in the three-phase power supply and the first end, the second end, the first disconnecting switch S1, the second disconnecting switch S2, or the third disconnecting switch S3 of the transmission line, thereby enabling each first rectifier arm U1, each second rectifier arm U2, each third rectifier arm U3, or each fourth rectifier arm U4 to convert AC power into DC power.

[0082] In one embodiment, when each first rectifier arm U1 includes at least two thyristors, the at least two thyristors are connected in series, and the input terminals of the at least two thyristors connected in series are used to connect to different phases of the three-phase power supply, and the output terminals of the at least two thyristors connected in series are connected to the first disconnecting switch S1 and the third disconnecting switch S3; and / or,

[0083] In the case where each second rectifier arm U2 includes a thyristor, at least two thyristors are connected in series, and the input terminal of the series-connected thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the series-connected thyristor is used to connect to the second terminal of the transmission line; and / or,

[0084] In the case where each third rectifier arm U3 includes a thyristor, at least two thyristors are connected in series, and the input terminal of the series-connected thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the series-connected thyristor is used to connect to the first terminal of the transmission line; and / or,

[0085] In the case where each fourth rectifier arm U4 includes a thyristor, at least two thyristors are connected in series, and the input terminal of the series-connected thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the series-connected thyristor is connected to the second disconnecting switch S2 and the third disconnecting switch S3.

[0086] In the embodiments of this application, when each first rectifier arm U1, each second rectifier arm U2, each third rectifier arm U3, or each fourth rectifier arm includes at least two thyristors, it is necessary to first connect at least two thyristors in series, and then connect the series-connected thyristors to different phases of the three-phase power supply and the first end, second end, first disconnecting switch S1, second disconnecting switch S2, or third disconnecting switch S3 of the transmission line wire, so as to realize that each first rectifier arm U1, each second rectifier arm U2, each third rectifier arm U3, or each fourth rectifier arm U4 converts AC power into DC power.

[0087] In the case of at least two thyristors connected in series, two adjacent thyristors are connected to the output terminal of the other thyristor through the input terminal of one thyristor. The at least two thyristors connected in series have only one unconnected first terminal and one unconnected second terminal. The unconnected first terminal and second terminal are connected to different phases of the three-phase power supply and the first terminal, second terminal of the wire, first disconnecting switch S1, second disconnecting switch S2 or third disconnecting switch S3.

[0088] like Figure 4 As shown, this application also provides a method for monitoring icing on transmission lines, applied to the aforementioned icing monitoring device for transmission lines, comprising:

[0089] Step 401: Monitor the icing of the transmission line to obtain the first icing information of the transmission line, which is used to characterize the icing situation of the transmission line.

[0090] Step 402: When the first icing information meets the first preset condition, the transmission line is de-iced by the de-icing module.

[0091] The aforementioned first icing information is used to characterize the icing condition of the transmission line and can be characterized in various forms. In some embodiments, it can be the icing thickness, in which case the icing monitoring module includes a camera, and the icing thickness is obtained by monitoring the camera. In some embodiments, it can be the icing weight, in which case the icing monitoring module includes a tension sensor, and the icing weight is calculated by monitoring the tension through the tension sensor.

[0092] The aforementioned first preset condition is a pre-set ice-melting condition. Ice melting is performed by the ice-melting module when the first preset condition is met. The ice-covering monitoring module and the ice-melting module are communicatively connected. When the first ice-covering information detected by the ice-covering monitoring module meets the first preset condition, the module sends an ice-melting command to the ice-melting module, which then performs ice melting upon receiving the command.

[0093] The first preset condition can be set based on the monitored first icing information. In some embodiments, the icing monitoring module monitors the icing thickness. In this case, the first preset condition is that the icing thickness is greater than a first preset thickness threshold. That is, when the icing thickness is greater than the first preset thickness threshold, the de-icing module melts the ice on the transmission line. In some embodiments, the icing monitoring module monitors the icing weight. In this case, the first preset condition is that the weight thickness is greater than a first preset weight threshold. That is, when the icing weight is greater than the first preset weight threshold, the de-icing module melts the ice on the transmission line.

[0094] In this embodiment, by monitoring the icing of the transmission line, first icing information of the transmission line is obtained, which is used to characterize the icing status of the transmission line. When the first icing information meets a first preset condition, the transmission line is de-iced by an de-icing module. In this way, by monitoring the icing status of the transmission line, it is determined whether the first preset condition is met. When the first preset condition is met, automated de-icing is achieved, which improves the response efficiency of de-icing, realizes timely de-icing, and thus reduces the damage rate of related components of the transmission line.

[0095] In one embodiment, such as Figure 5 As shown, after step 402, the method further includes:

[0096] Step 403: Monitor the icing of the transmission line to obtain the second icing information of the transmission line;

[0097] Step 404: When the second icing information meets the second preset condition, control the de-icing module to stop de-icing the transmission line.

[0098] The aforementioned second icing information is used to characterize the icing condition of the transmission line and can be characterized in various forms. In some embodiments, it can be the icing thickness, in which case the icing monitoring module includes a camera, and the icing thickness is obtained by monitoring the camera. In some embodiments, it can be the icing weight, in which case the icing monitoring module includes a tension sensor, and the icing weight is calculated by monitoring the tension through the tension sensor.

[0099] The aforementioned second preset condition is a pre-set ice-melting condition. When the second preset condition is met, the ice-melting module is controlled to stop melting ice. Specifically, the icing monitoring module and the ice-melting module are communicatively connected. When the second icing information detected by the icing monitoring module meets the second preset condition, it sends a de-icing command to the ice-melting module, which then stops melting ice upon receiving the command.

[0100] The second preset condition can be set based on the monitored second icing information. In some embodiments, the icing monitoring module monitors the icing thickness. In this case, the second preset condition is that the icing thickness is less than a second preset thickness threshold; that is, when the icing thickness is less than the second preset thickness threshold, the de-icing module is controlled to stop de-icing. In some embodiments, the icing monitoring module monitors the icing weight. In this case, the second preset condition is that the weight thickness is less than a second preset weight threshold; that is, when the icing weight is less than the second preset weight threshold, the de-icing module is controlled to stop de-icing.

[0101] In this embodiment of the application, by monitoring the icing of the transmission line, second icing information of the transmission line is obtained; when the second icing information meets the second preset condition, the de-icing module is controlled to stop de-icing the transmission line, thereby realizing automatic de-icing and stopping of the icing.

[0102] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0103] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A power transmission line icing monitoring device, characterized in that, include: An icing monitoring module is used to monitor the icing of transmission lines and obtain icing information of the transmission lines, wherein the icing information is used to characterize the icing status of the transmission lines. An ice-melting module, communicatively connected to the icing monitoring module, is used to melt ice on the transmission line. The ice-melting module includes: The first thyristor rectifier bridge has an input terminal for connecting to an AC power source, a first output terminal for having a first disconnecting switch, a second output terminal for connecting to a first end of a power transmission line via the first disconnecting switch, and a third output terminal for connecting to a second end of the power transmission line. The second thyristor rectifier bridge has an input terminal for connecting to the AC power supply, a first output terminal for connecting to the first end of the transmission line, and a second output terminal for connecting to the second end of the transmission line via the second disconnect switch. The third disconnecting switch is used to connect the second end of the first thyristor rectifier bridge to the first end of the second thyristor rectifier bridge. When the ice-melting module needs to output a first voltage, the first and second isolating switches are closed, and the third isolating switch is opened. When the ice-melting module needs to output a second voltage, the first and second isolating switches are open, the third isolating switch is closed, and the second voltage is greater than the first voltage. The icing monitoring module is used for: The icing of the transmission line is monitored to obtain the first icing information of the transmission line, which is used to characterize the icing situation of the transmission line. When the first icing information meets the first preset condition, the icing monitoring module is used to melt the ice on the transmission line through the de-icing module; the icing information includes at least one of ice thickness and ice weight; The preset conditions include at least one of the following: The ice thickness exceeds the preset thickness threshold; If the icing weight exceeds a preset weight threshold; after the icing module melts the ice on the transmission line, the icing monitoring module is further configured to: The icing of the transmission line is monitored to obtain the second icing information of the transmission line; When the second icing information meets the second preset condition, the de-icing module is controlled to stop de-icing the transmission line.

2. The icing monitoring device for transmission lines as described in claim 1, characterized in that, The first output terminal of the first thyristor rectifier bridge is provided with a reactor, and the first output terminal of the first thyristor rectifier bridge is connected to the first disconnecting switch through the reactor; and / or, The reactor is provided at the second output terminal of the first thyristor rectifier bridge, and the second input terminal of the first thyristor rectifier bridge is used to connect to the second terminal of the transmission line through the reactor; and / or, The first output terminal of the second thyristor rectifier bridge is provided with a reactor, and the first output terminal of the first thyristor rectifier bridge is used to connect to the first terminal of the transmission line through the reactor; and / or, The second output terminal of the second thyristor rectifier bridge is provided with the reactor, and the second input terminal of the second thyristor rectifier bridge is connected to the second disconnecting switch through the reactor.

3. The icing monitoring device for transmission lines as described in claim 1, characterized in that, It also includes a transformer, which includes a first winding, a second winding and a third winding. The first winding is a delta winding or a Y winding, the second winding is a delta winding or a Y winding, and the second winding and the third winding are windings of different types. The first winding is used to connect to the AC power supply, the second winding is connected to the input terminal of the first thyristor rectifier bridge, and the third winding is connected to the input terminal of the second thyristor rectifier bridge.

4. The icing monitoring device for transmission lines as described in any one of claims 1 to 3, characterized in that, When the AC power supply is a three-phase power supply, the first thyristor rectifier bridge includes three first rectifier arms and three second rectifier arms. The input terminal of each first rectifier arm is used to connect to different phases of the three-phase power supply, and the output terminal of each first rectifier arm is connected to one end of the third disconnecting switch. The output terminal of each first rectifier arm is used to connect to the first end of the transmission line through the first disconnecting switch. The input terminal of each second rectifier arm is used to connect to different phases of the three-phase power supply, and the output terminal of each second rectifier arm is used to connect to the second end of the transmission line. When the AC power supply is a three-phase power supply, the second thyristor rectifier bridge includes three third rectifier arms and three fourth rectifier arms. The input terminal of each third rectifier arm is used to connect to different phases of the three-phase power supply, and the output terminal of each third rectifier arm is used to connect to the first end of the transmission line. The input terminal of each fourth rectifier arm is used to connect to different phases of the three-phase power supply, and the output terminal of each fourth rectifier arm is connected to the other end of the third disconnecting switch. The output terminal of each fourth rectifier arm is used to connect to the second end of the transmission line through the second disconnecting switch.

5. The icing monitoring device for transmission lines as described in claim 4, characterized in that, Each first rectifier arm includes at least one thyristor, each second rectifier arm includes at least one thyristor, each third rectifier arm includes at least one thyristor, and each fourth rectifier arm includes at least one thyristor.

6. The icing monitoring device for transmission lines as described in claim 5, characterized in that, In the case where each first rectifier arm includes a thyristor, the input terminal of the thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the thyristor is connected to the first disconnecting switch and the third disconnecting switch; and / or, In the case where each second rectifier arm includes a thyristor, the input terminal of the thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the thyristor is used to connect to the second terminal of the transmission line; and / or, In the case where each third rectifier arm includes a thyristor, the input terminal of the thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the thyristor is used to connect to the first terminal of the transmission line; and / or, In the case where each fourth rectifier arm includes a thyristor, the input terminal of the thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the thyristor is connected to the second disconnecting switch and the third disconnecting switch.

7. The icing monitoring device for transmission lines as described in claim 5, characterized in that, In the case where each first rectifier arm includes at least two thyristors, the at least two thyristors are connected in series, and the input terminals of the at least two thyristors connected in series are used to connect to different phases of the three-phase power supply, and the output terminals of the at least two thyristors connected in series are connected to the first disconnecting switch and the third disconnecting switch; and / or, In the case where each second rectifier arm includes a thyristor, at least two thyristors are connected in series, and the input terminal of the series-connected thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the series-connected thyristor is used to connect to the second terminal of the transmission line; and / or, In the case where each third rectifier arm includes a thyristor, at least two thyristors are connected in series, and the input terminal of the series-connected thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the series-connected thyristor is used to connect to the first terminal of the transmission line; and / or, In the case where each fourth rectifier arm includes a thyristor, at least two thyristors are connected in series, and the input terminal of the series-connected thyristor is used to connect to different phases of the three-phase power supply, and the output terminal of the series-connected thyristor is connected to the second disconnecting switch and the third disconnecting switch.

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