Overhead ground wire ice melting device and method based on Scott transformer
By constructing a two-phase or single-phase symmetrical load using an ice-melting device based on a Scott transformer, the problems of three-phase unbalanced current and device complexity in overhead ground wire ice melting are solved, and efficient ice melting adaptable to different scenarios is achieved.
Patent Information
- Application Number
- CN202610396525.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-30
- Publication Date
- 2026-05-15
AI Technical Summary
Existing technologies cannot effectively apply AC de-icing devices to overhead ground wires, resulting in unbalanced three-phase currents. Furthermore, DC de-icing devices have complex structures and poor mobility, failing to meet the de-icing requirements of overhead ground wires.
An ice-melting device based on a Scott transformer is used, which includes a Scott transformer, compensation elements, matching elements, circuit breakers and a measurement and control unit. By constructing a two-phase or single-phase symmetrical load, ice melting of the overhead ground wire is achieved.
The problem of three-phase unbalanced current in overhead ground wire de-icing has been solved, and two-phase and single-phase de-icing methods have been provided, which are applicable to different scenarios and improve mobility and de-icing efficiency.
Smart Images
Figure CN122051856A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of power transmission line de-icing technology, specifically relating to an overhead ground wire de-icing device and method based on a Scott transformer. Background Technology
[0002] Compared to transmission conductors, overhead ground wires operate in lower temperatures and have no working load current flowing through them, making them more prone to icing under severe weather conditions such as low temperatures, rain, snow, and freezing. At the same time, the mechanical strength of overhead ground wires is lower than that of transmission conductors, and after icing, they will experience a significant increase in sag and a sharp rise in mechanical stress, which can easily lead to safety accidents such as ground wire breakage and line faults, seriously threatening the safe operation of transmission lines.
[0003] Depending on the type of power supply applied, existing line de-icing technologies can be divided into two types: DC de-icing and AC de-icing. DC de-icing devices offer flexible current adjustment and excellent controllability; however, this technology relies on power electronic converters, resulting in complex system structures and high manufacturing costs, and is mostly deployed as fixed units. Existing mobile DC de-icing equipment generally suffers from large vehicle size, limiting its mobility in mountainous areas prone to icing. AC de-icing only requires connecting to an AC power source and establishing a three-phase short-circuit loop to achieve de-icing. While it has drawbacks such as higher reactive power loss and higher required power capacity, AC transformers offer advantages such as high operational reliability, fewer supporting equipment, lower investment costs, and convenient mobile deployment. It has already achieved mature application in transmission line de-icing operations, and both DC and AC de-icing technologies are adaptable to different engineering application scenarios.
[0004] However, overhead ground wire de-icing operations can only use DC de-icing methods. The core reason is that overhead ground wire de-icing circuits only possess single-phase or two-phase electrical characteristics. In scenarios where single-circuit or double-circuit transmission lines are erected on the same tower, short-circuiting two overhead ground wires forms a single-phase de-icing circuit; in scenarios where double-circuit lines are erected on different towers, short-circuiting four overhead ground wires forms a two-phase de-icing circuit, such as... Figure 1 As shown, none of the above circuits can form a three-phase symmetrical load. If a conventional three-phase transformer is directly used as the AC de-icing power source for the overhead ground wire, a three-phase unbalanced current will be generated on the power supply side. Regardless of whether the power is drawn from the grid or powered by a generator, this will adversely affect the safe operation of the power supply system and the service life of electrical equipment, making it impossible to directly apply conventional AC de-icing technology to the overhead ground wire. Summary of the Invention
[0005] To overcome the shortcomings of the prior art, the present invention provides an overhead ground wire de-icing device and method based on a Scott transformer.
[0006] The present invention discloses an overhead ground wire de-icing device based on a Scott transformer, comprising a Scott transformer, a compensation element, a matching element, a circuit breaker, and a measurement and control unit.
[0007] The Scott transformer includes an M-phase transformer and a T-phase transformer. The primary winding of the M-phase transformer is used to connect any two phases of the three-phase power supply, and a center tap is set at 50% of the turns of its winding. One end of the primary winding of the T-phase transformer is used to connect the third phase of the three-phase power supply, and the other end is connected to the center tap of the primary winding of the M-phase transformer, forming a "T"-shaped three-phase side connection structure. The secondary winding of the Scott transformer consists of two independent windings for connecting to the overhead ground wire de-icing circuit. The secondary voltages of the M-phase transformer and the T-phase transformer have a fixed 90° phase difference, and the turns ratio meets the preset proportional relationship.
[0008] The compensation element includes an adjustable capacitor. and These are connected in series in the secondary circuits of the M and T phases of the Scott transformer, respectively, to adjust the total impedance of the ice-melting circuit.
[0009] The matching element package includes matching capacitors. and matching inductor Matching capacitor Parallel connection to the ungrounded terminals of the M and T phases of the Scott transformer, with matching inductance. It is connected in parallel to the M phase of the Scott transformer.
[0010] The circuit breaker is connected in series between the primary side of the Scott transformer and the three-phase power supply, and between the secondary side and the de-icing circuit, serving as a component for on / off control and short-circuit protection of the main de-icing circuit.
[0011] The measurement and control unit is used to detect the current, voltage and impedance status of the ice melting device, and to adjust the capacitance level of the compensation element and the working status of the Scott transformer.
[0012] Furthermore, the Scott transformer adopts a dry-type structure, and its primary side rated voltage is compatible with 10 kV or 35 kV power feeder voltage.
[0013] Furthermore, the adjustable capacitor is a switch-on parallel capacitor bank, including a fixed capacitor unit. and H binary weighted adjustable capacitor units The adjustment range is to Adjust the step size to , It is the smallest capacity unit.
[0014] Furthermore, the circuit breaker is a high-voltage vacuum circuit breaker with an outdoor structure, a vacuum insulating medium, a rated voltage compatible with 10 kV or 35 kV power feeder voltage, and a rated current not less than the maximum operating current of the Scott transformer primary side.
[0015] Furthermore, the measurement and control unit includes a detection module, a processing module, a control module, and a protection module; the detection module includes a current transformer and a voltage transformer; the control module includes a relay output module, used to control the switching of compensation elements and the starting and stopping of the Scott transformer; the protection module presets overcurrent thresholds and overvoltage thresholds, used to issue a trip signal when the parameters exceed the thresholds.
[0016] Furthermore, it also includes a mobile carrier, on which the Scott transformer, compensation element, matching element, circuit breaker and measurement and control unit are integrated, and the generator is integrated into the mobile carrier or externally as an optional power supply element.
[0017] The present invention provides an overhead ground wire de-icing method based on a Scott transformer, employing the aforementioned de-icing device, including a two-phase de-icing circuit method and a single-phase de-icing circuit method.
[0018] The two-phase de-icing loop de-icing method described above is applicable to four overhead ground wires in a dual-loop different tower scenario. The two independent overhead ground wire loops in this scenario are defined as Line A and Line B, with two overhead ground wires installed on each line, for a total of four overhead ground wires. The specific steps are as follows:
[0019] A1: The overhead ground wire is modified into pre-defined segments by using segmented disconnect switches, and the grounding disconnect switches of each segment are disconnected to achieve insulation of the entire segment.
[0020] A2: Close all the sectional disconnect switches of lines A and B, and short-circuit the two overhead ground wires on one side of the substation to create two loads with the same impedance. and ,in , , , The impedance of the four overhead ground wires.
[0021] A3: Connect the secondary side M-phase and T-phase of the Scott transformer to two symmetrical loads respectively, and connect the primary side to a three-phase power supply.
[0022] A4: Based on the impedance parameters of the overhead ground wire and the de-icing current requirements, the adjustable capacitor is adjusted via a command issued by the monitoring and control unit. and The setting ensures that the total impedance of the ice-melting circuit is within a reasonable range.
[0023] A5: Start the ice-melting device. The Scott transformer converts the three-phase power supply into a two-phase symmetrical power supply and outputs ice-melting current to the ice-melting circuit. The measurement and control unit monitors the operating parameters in real time.
[0024] The single-phase de-icing circuit de-icing method described above is applicable to two overhead ground wires in dual-circuit towers or single-circuit scenarios. The specific steps are as follows:
[0025] B1: The overhead ground wire is modified into a pre-defined segmented structure by using segmented disconnect switches, and the grounding disconnect switches of each segment are disconnected to achieve insulation of the entire segment.
[0026] B2: Short-circuit the two overhead ground wires on one side of the substation to form a single-phase de-icing load. ,in , The impedance of the two overhead ground wires.
[0027] B3: Connect the secondary T phase of the Scott transformer to the single-phase ice-melting load, and connect the secondary M phase in parallel with a matching inductor. Matching capacitors are connected in parallel at the ungrounded terminals of phases M and T. .
[0028] B4: Based on the actual impedance of the overhead ground wire and compensation capacitor The gear position is determined by calculating the matching capacitor using the following formula. and matching inductor Parameters:
[0029] ;
[0030] B5: Connect the primary side of the Scott transformer to a three-phase power supply, start the ice-melting device, and use matching elements to convert the single-phase load into a two-phase symmetrical load, outputting ice-melting current to complete the ice-melting operation.
[0031] Furthermore, matching capacitors and matching inductor For fixed-value components, the corresponding specifications of the components are pre-configured in the substation after the parameters are calculated according to the preset formula.
[0032] Furthermore, during the de-icing process, when the protection module of the monitoring and control unit detects that the current or voltage exceeds the preset threshold, it immediately issues a trip signal to cut off the three-phase power supply on the primary side of the Scott transformer.
[0033] The beneficial technical effects of this invention compared to the prior art are as follows:
[0034] This invention solves the problems of three-phase unbalanced current generated when conventional AC de-icing is applied to overhead ground wires, as well as the complexity and poor mobility of DC de-icing devices. It also provides two-phase and single-phase de-icing methods, which are respectively adapted to de-icing scenarios of dual-circuit different towers and dual-circuit same tower / single-circuit overhead ground wires. Attached Figure Description
[0035] Figure 1 This is a schematic diagram of the overhead ground wire de-icing circuit.
[0036] Figure 2 The basic principle of wiring a Scott transformer.
[0037] Figure 3 This is a wiring diagram for a switch-on adjustable capacitor.
[0038] Figure 4 This is a schematic diagram of the insulation modification of the overhead ground wire.
[0039] Figure 5 This is a wiring diagram for de-icing of the overhead ground wire of a transmission line based on a Scott transformer.
[0040] Figure 6 This is a wiring diagram for single-phase de-icing of the overhead ground wire of a transmission line based on a Scott transformer. Detailed Implementation
[0041] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0042] It should be noted that the terms "Line A" and "Line B" in this invention are used only to distinguish different lines and do not indicate a specific order or priority; "connection" includes direct connection and indirect connection, unless otherwise explicitly stated; all numerical ranges are closed intervals including the endpoints, and parameter values can be flexibly adjusted according to actual engineering needs.
[0043] I. An Overhead Ground Wire De-icing Device Based on a Scott Transformer
[0044] The overhead ground wire de-icing device based on the Scott transformer includes the Scott transformer, compensation elements, matching elements, circuit breakers, and a measurement and control unit.
[0045] The Scott transformer includes an M-phase transformer and a T-phase transformer, both of which adopt a dry-type structure and are suitable for outdoor de-icing environments. Figure 2As shown, the primary winding of the M-phase transformer is used to connect any two phases of the three-phase power supply (such as phase A and phase B), and a center tap is set at 50% of the turns of its winding. One end of the primary winding of the T-phase transformer is used to connect to the third phase of the three-phase power supply (such as phase C), and the other end is connected to the center tap of the primary winding of the M-phase transformer, forming a "T"-shaped three-phase side connection structure. The secondary winding of the Scott transformer consists of two independent windings, used to connect to the overhead ground wire de-icing circuit. The secondary voltages of the M-phase and T-phase transformers have a fixed 90° phase difference, and their turns ratios satisfy a preset proportional relationship. The turns ratio of the M-phase transformer is... The turns ratio of the T-phase transformer is And satisfy Ensure secondary voltage The primary side rated voltage is adapted to the power feed line voltage (10 kV or 35 kV), and the secondary side rated voltage is 10 kV and 35 kV respectively in this embodiment.
[0046] The compensation element is a switchable parallel capacitor bank, including an adjustable capacitor. and These are connected in series in the secondary circuits of the M-phase and T-phase of the Scott transformer, respectively, to adjust the total impedance of the de-icing circuit. For example... Figure 3 As shown, the adjustable capacitor includes a fixed capacitor unit. And adjustable capacitor units, set up H adjustable capacitor units, the capacitance of the h-th adjustable capacitor unit is ( ), This is the smallest capacity unit; this structure can achieve multiple capacity combinations with a limited number of capacitor units, and the adjustment range is... to Adjust the step size to Adjustable capacitor It is connected in series between the M-phase secondary side of the Scott transformer and the de-icing load. It is connected in series between the secondary side of phase T and the de-icing load.
[0047] The matching element package includes matching capacitors. and matching inductor Used to achieve impedance matching in single-phase de-icing circuit scenarios, converting a single-phase load into a two-phase symmetrical load; matching capacitor Parallel connection to the ungrounded terminals of phases M and T of the Scott transformer to compensate for current phase shift; matching inductor It is connected in parallel to the M phase of the Scott transformer to offset the inductive component in the overhead ground impedance.
[0048] The circuit breaker described is a high-voltage vacuum circuit breaker, connected in series between the primary side of the Scott transformer and the three-phase power supply. It is the core on-off control and short-circuit protection component of the main de-icing circuit. It adopts an outdoor high-voltage vacuum circuit breaker with vacuum insulation medium. The rated voltage matches the power feeder voltage (10 kV or 35 kV). The rated current is not less than the maximum operating current of the primary side of the Scott transformer. It is connected in series between the output terminal of the three-phase power supply and the input terminal of the primary side of the Scott transformer. The two ends are connected by high-voltage flanges or bolts, and the terminals are equipped with insulating sleeves.
[0049] The measurement and control unit includes a detection module, a processing module, a control module, and a protection module. The detection module includes current transformers and voltage transformers, with a measurement range covering the maximum current and voltage during the ice melting process. The control module includes a relay output module for controlling the switching of compensation components and the starting and stopping of the Scott transformer. The protection module presets overcurrent and overvoltage thresholds. When a parameter exceeds the threshold, it immediately issues a trip signal to cut off the primary power supply to the Scott transformer, protecting the device and the line.
[0050] Optionally, the ice-melting device also includes a mobile carrier (such as an ice-melting vehicle), which integrates the generator, Scott transformer, compensation components, and control unit onto the mobile carrier to achieve mobile deployment; by using the segmented disconnector of the overhead ground wire to construct a symmetrical load, it can be connected at the intermediate node of the ice-covered overhead ground wire, thereby improving the mobility of emergency ice-melting.
[0051] II. A method for de-icing overhead ground wires based on Scott transformers
[0052] To meet the requirements of de-icing, the original overhead ground wires of the transmission lines need to be upgraded with segmented insulation, specifically as follows:
[0053] Under normal power system operation, overhead ground wires are grounded tower by tower. To meet the insulation and segmented short-circuiting requirements of de-icing operations, the overhead ground wires are modified into a multi-segment structure, with segmented disconnect switches installed at the junctions of every two segments. Before de-icing operations begin, the grounding disconnect switches for each segment are disconnected to ensure insulation of the entire section of the overhead ground wire to be de-iced. After de-icing operations are completed, the grounding disconnect switches are restored to closure, and the overhead ground wire returns to its normal grounding operation state.
[0054] like Figure 4 As shown, the modified overhead ground wire is evenly divided into X+1 segments, with X segmented disconnect switches configured for each overhead ground wire; for double-circuit transmission lines with different tower designs, a total of 4 overhead ground wires are installed, and their impedances are defined as follows: , , , .
[0055] The de-icing methods for overhead ground wires based on Scott transformers include two-phase de-icing circuit de-icing methods and single-phase de-icing circuit de-icing methods.
[0056] Example 1:
[0057] Applicable to transmission lines with dual-circuit tower designs.
[0058] Based on the aforementioned overhead ground wire modification results, close all section disconnect switches of lines A and B, and short-circuit the overhead ground wires on the n side of the substation: connect line A... and Short circuit, line B and By shorting the circuit, two ice-melting loads with identical impedances are constructed, namely... and .
[0059] like Figure 5 As shown, the Scott transformer is connected to the three-phase power supply of the substation via power-side circuit breakers QF-A, QF-B, and QF-C. The secondary side of the transformer is connected to the de-icing load via circuit breakers QF-M1, QF-M2, QF-T2, and QF-T1, respectively. To adapt to overhead ground wires with different parameters and to achieve precise adjustment of the de-icing current, an adjustable capacitor is connected in series with the M phase of the secondary side of the Scott transformer. An adjustable capacitor is connected in series with phase T. .
[0060] By closing all circuit breakers on the power supply side and the transformer secondary side, the Scott transformer converts the three-phase power supply to a two-phase power supply, outputting de-icing current to two symmetrical de-icing loads; by adjusting... and The capacitance value is adjusted to change the impedance of the de-icing circuit, so that the de-icing current reaches the rated value required for de-icing of the overhead ground wire, thereby achieving uniform de-icing of the entire overhead ground wire.
[0061] Example 2:
[0062] It is suitable for transmission lines with double-circuit towers or single-circuit designs, and only two overhead ground wires are configured to construct an equivalent symmetrical load through impedance matching.
[0063] by Figure 4 The overhead ground wire of the China League One line is used for de-icing; it is only short-circuited on one side to form a single-phase de-icing load with an impedance of [insulation value missing]. ,like Figure 6 As shown, the T-phase of the Scott transformer secondary side is connected to the single-phase load.
[0064] To address the primary current imbalance issue of the Scott transformer, impedance matching of the de-icing circuit is achieved using capacitors and inductors, with the specific configuration as follows:
[0065] 1. Connect capacitors in parallel at the ungrounded terminals of phases M and T of the Scott transformer. It is used to compensate for the current phase shift of the lagging phase.
[0066] 2. Parallel inductor in phase M of the Scott transformer It is used to offset the inductive component in the impedance of the overhead ground wire.
[0067] 3. Continuing the adjustable current design, an adjustable capacitor is connected in series with phase T of the Scott transformer. It is compatible with the parameters of different overhead ground wires.
[0068] In this embodiment, and Using fixed-value components (stepless adjustment components are too expensive and not suitable for engineering practice), the impedance parameters of the overhead ground wire to be melted are measured in advance before the ice melting operation, and the actual impedance of the overhead ground wire is determined accordingly. and compensation capacitor The gear position is determined by calculating the matching component parameters using the following formula:
[0069] ;
[0070] Configure the corresponding specifications in the substation. and To achieve precise impedance matching of the ice-melting load; by adjusting The capacitance value is adjusted so that the de-icing current reaches the rated value, and then all circuit breakers are closed in sequence to complete the de-icing operation of the single-phase overhead ground wire.
[0071] This embodiment is only used to explain the present invention and does not constitute a limitation on the scope of protection of the present invention.
Claims
1. An overhead ground wire de-icing device based on a Scott transformer, characterized in that, Includes Scott transformers, compensation components, matching components, circuit breakers, and measurement and control units; The Scott transformer includes an M-phase transformer and a T-phase transformer. The primary winding of the M-phase transformer is used to connect any two phases of the three-phase power supply, and a center tap is set at 50% of the turns of its winding. One end of the primary winding of the T-phase transformer is used to connect to the third phase of the three-phase power supply, and the other end is connected to the center tap of the primary winding of the M-phase transformer, forming a "T"-shaped three-phase side connection structure. The secondary winding of the Scott transformer consists of two independent windings for connecting to the overhead ground wire de-icing circuit. The secondary voltages of the M-phase transformer and the T-phase transformer have a fixed 90° phase difference, and the turns ratio meets the preset proportional relationship. The compensation element includes an adjustable capacitor. and These are connected in series in the secondary circuits of the M-phase and T-phase of the Scott transformer, respectively, to adjust the total impedance of the de-icing circuit; The matching element package includes matching capacitors. and matching inductor Matching capacitor Parallel connection to the ungrounded terminals of the M and T phases of the Scott transformer, with matching inductance. Connected in parallel to the M phase of the Scott transformer; The circuit breaker is connected in series between the primary side of the Scott transformer and the three-phase power supply, and between the secondary side and the de-icing circuit, serving as a component for on / off control and short-circuit protection of the main de-icing circuit. The measurement and control unit is used to detect the current, voltage and impedance status of the ice melting device, and to adjust the capacitance level of the compensation element and the working status of the Scott transformer.
2. The overhead ground wire de-icing device based on a Scott transformer according to claim 1, characterized in that, The Scott transformer adopts a dry-type structure, and its primary side rated voltage is adapted to 10 kV or 35 kV power feeder voltage.
3. The overhead ground wire de-icing device based on a Scott transformer according to claim 1, characterized in that, The adjustable capacitor is a switchable parallel capacitor bank, including a fixed capacitor unit. and H binary weighted adjustable capacitor units The adjustment range is to Adjust the step size to , It is the smallest capacity unit.
4. The overhead ground wire de-icing device based on a Scott transformer according to claim 1, characterized in that, The circuit breaker is a high-voltage vacuum circuit breaker with an outdoor structure. The insulating medium is vacuum. The rated voltage is compatible with 10 kV or 35 kV power feeder voltage, and the rated current is not less than the maximum operating current of the primary side of the Scott transformer.
5. The overhead ground wire de-icing device based on a Scott transformer according to claim 1, characterized in that, The measurement and control unit includes a detection module, a processing module, a control module, and a protection module; the detection module includes a current transformer and a voltage transformer; the control module includes a relay output module for controlling the switching of compensation elements and the starting and stopping of the Scott transformer; the protection module presets overcurrent thresholds and overvoltage thresholds for issuing trip signals when parameters exceed the thresholds.
6. The overhead ground wire de-icing device based on a Scott transformer according to claim 1, characterized in that, It also includes a mobile carrier, on which the Scott transformer, compensation element, matching element, circuit breaker and measurement and control unit are integrated, and the generator is integrated into the mobile carrier or externally as an optional power supply element.
7. A method for de-icing overhead ground wires based on a Scott transformer, employing the de-icing device as described in any one of claims 1-6, characterized in that, This includes two-phase de-icing circuit methods and single-phase de-icing circuit methods; The two-phase de-icing loop de-icing method described above is applicable to four overhead ground wires in a dual-loop different tower scenario. The two independent overhead ground wire loops in this scenario are defined as Line A and Line B, with two overhead ground wires installed on each line, for a total of four overhead ground wires. The specific steps are as follows: A1: The overhead ground wire is modified into a pre-defined segmented structure by using segmented disconnect switches, and the grounding disconnect switches of each segment are disconnected to achieve insulation of the entire segment; A2: Close all the sectional disconnect switches of lines A and B, and short-circuit the two overhead ground wires on one side of the substation to create two loads with the same impedance. and ,in , , , The impedance of the four overhead ground wires; A3: Connect the secondary side M phase and T phase of the Scott transformer to two symmetrical loads respectively, and connect the primary side to a three-phase power supply; A4: Based on the impedance parameters of the overhead ground wire and the de-icing current requirements, the adjustable capacitor is adjusted via a command issued by the monitoring and control unit. and The setting ensures that the total impedance of the ice-melting circuit is within a reasonable range; A5: Start the ice-melting device. The Scott transformer converts the three-phase power supply into a two-phase symmetrical power supply and outputs ice-melting current to the ice-melting circuit. The measurement and control unit monitors the operating parameters in real time. The single-phase de-icing circuit de-icing method described above is applicable to two overhead ground wires in dual-circuit towers or single-circuit scenarios. The specific steps are as follows: B1: The overhead ground wire is transformed into a pre-defined segmented structure by using segmented disconnect switches, and the grounding disconnect switches of each segment are disconnected to achieve insulation of the entire segment; B2: Short-circuit the two overhead ground wires on one side of the substation to form a single-phase de-icing load. ,in , The impedance of the two overhead ground wires; B3: Connect the secondary T phase of the Scott transformer to the single-phase ice-melting load, and connect the secondary M phase in parallel with a matching inductor. Matching capacitors are connected in parallel at the ungrounded terminals of phases M and T. ; B4: Based on the actual impedance of the overhead ground wire and compensation capacitor The gear position is determined by calculating the matching capacitor using the following formula. and matching inductor Parameters: ； B5: Connect the primary side of the Scott transformer to a three-phase power supply, start the ice-melting device, and use matching elements to convert the single-phase load into a two-phase symmetrical load, outputting ice-melting current to complete the ice-melting operation.
8. The method for de-icing overhead ground wires based on a Scott transformer according to claim 7, characterized in that, The matching capacitor and matching inductor For fixed-value components, the corresponding specifications of the components are pre-configured in the substation after the parameters are calculated according to the preset formula.
9. The method for de-icing overhead ground wires based on a Scott transformer according to claim 7, characterized in that, During the de-icing process, when the protection module of the monitoring and control unit detects that the current or voltage exceeds the preset threshold, it immediately issues a trip signal to cut off the three-phase power supply on the primary side of the Scott transformer.