Mobile ice melting device for distribution network and ice melting method based on temperature and current

Abstract

The invention relates to the technical field of ice melting devices, in particular to a movable ice melting device for a distribution network and an ice melting method based on temperature and current. The three high-voltage cables are respectively marked as a line A, a line B and a line C based on temperature and current, strain clamps based on temperature and current are arranged among the high-voltage cables based on temperature and current, and the on / off of the current is controlled through the strain clamps based on temperature and current; if so, normally supplying power; if not, stopping power supply; according to the invention, through a movable operation mode, rapid response and flexible deployment of the ice melting operation of the distribution network line in the mountainous area are realized; and meanwhile, corresponding output current and temperature can be automatically matched according to the specification of the cable, so that the ice melting efficiency is ensured, the cable cannot be damaged, and the operation safety is improved.

Description

Technical Field

[0001] This invention relates to the field of de-icing devices, and in particular to a mobile de-icing device for power distribution networks and a de-icing method based on temperature and current. Background Technology

[0002] Ice accumulation on power distribution lines in mountainous areas during winter is a significant issue that threatens the safe operation of these lines. Due to a lack of de-icing equipment specifically designed for these lines, every winter, power supply companies have to dispatch a large number of personnel to manually knock off the ice along the lines. This manual de-icing process is inefficient and poses a significant safety hazard. Because the high-voltage cables used in mountain power distribution networks have different specifications such as conductor cross-section and material (e.g., aluminum core, copper core), the DC resistance values ​​of different cable specifications are different. According to Joule's law, the parameters required to achieve the ideal de-icing effect (e.g., current intensity, duration) are also different. If the current value and temperature of the de-icing line cannot be monitored in real time during the de-icing operation, there may be problems such as current overload leading to aging and damage of the conductor insulation layer, or insufficient current leading to incomplete de-icing. At the same time, it may cause safety risks such as equipment burnout and line short circuit. Summary of the Invention

[0003] In view of the problems existing in the mobile de-icing devices for power distribution networks and the de-icing methods based on temperature and current, the present invention is proposed.

[0004] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a mobile ice-melting device for power distribution networks, comprising, At least three high-voltage cables based on temperature and current; The three high-voltage cables are respectively identified as Line A, Line B and Line C based on temperature and current. Each of the high-voltage cables is equipped with a tension clamp based on temperature and current, and the current is controlled by the tension clamp based on temperature and current. Normal power supply is generally guaranteed. If the power supply is interrupted, each high-voltage cable is separated into a live power supply line and a non-live de-icing line based on temperature and current to facilitate local de-icing operations. The ice-melting process is based on temperature and current, including... The current-draining unit, based on temperature and current, is used to introduce high-voltage AC power from the power supply line as the input power for ice melting. The transformer unit is based on temperature and current, and its high-voltage side is electrically connected to the current-draining unit based on temperature and current, which is used to convert the introduced high-voltage AC power into low-voltage AC power. The rectifier unit is based on temperature and current, and its AC input terminal is electrically connected to the low-voltage side of the transformer unit based on temperature and current, in order to rectify the low-voltage AC power after transformation into DC power. The output unit, based on temperature and current, feeds the rectified DC power into the ice-melting circuit, allowing a continuous DC current to flow through the circuit. The Joule heating effect generates heat within the circuit itself, and the ice is melted through heat conduction. The mobile carrier, based on temperature and current, is used to carry the ice-melting components. It is mobile and can be quickly deployed to the site.

[0005] In a preferred embodiment of the mobile ice-melting device for power distribution networks described in this invention: the diversion unit includes at least three flexible conductors A based on temperature and current, and the three flexible conductors A are respectively paired with three power supply lines.

[0006] In a preferred embodiment of the mobile ice-melting device for power distribution networks described in this invention: the flexible conductor A is equipped with a high-voltage switch based on temperature and current; The high-voltage switch is electrically connected to one end of the flexible conductor A based on temperature and current, and the stationary end is electrically connected to the high-voltage winding input terminal of the transformer unit based on temperature and current, thus serving the dual functions of power isolation and short-circuit protection.

[0007] In a preferred embodiment of the mobile ice-melting device for power distribution networks described in this invention: the transformer unit is based on a 10 / 0.4kV power transformer with a temperature and current rating, and has a capacity range of 100-200kVA.

[0008] In a preferred embodiment of the mobile ice-melting device for power distribution networks described in this invention: the output unit includes at least two flexible conductors B based on temperature and current, and a shorting wire based on temperature and current; The two flexible conductors B are positive and negative based on temperature and current, respectively. The positive conductor is connected to the starting end of the de-icing circuit on line A, and the negative conductor is connected separately to the starting end of the de-icing circuit on line B, or the starting ends of the de-icing circuits of line B and line C are connected in parallel. The shorting wire connects the ends of the ice-melting circuits A and B, or the ends of the ice-melting circuits A, B, and C, based on temperature and current to form a circuit.

[0009] In a preferred embodiment of the mobile ice-melting device for power distribution networks described in this invention: the flexible conductor B is equipped with a low-voltage switch based on temperature and current.

[0010] In a preferred embodiment of the mobile de-icing device for power distribution networks described in this invention: the de-icing component, based on temperature and current, also includes... The detection unit collects the operating parameters of the ice melting circuit in real time based on temperature and current, providing status feedback for subsequent control. The intelligent control unit, based on temperature and current, and the feedback data from the detection unit based on temperature and current, performs closed-loop control of the operating status of the transformer unit and the rectifier unit based on temperature and current, thereby achieving adaptive adjustment of the ice melting process.

[0011] In a preferred embodiment of the mobile ice-melting device for power distribution network described in this invention: the detection unit is composed of a current transformer and a temperature sensing element, wherein the current transformer is connected in series between the output terminal of the rectifier unit and the ice-melting line to collect the working current signal of the ice-melting circuit in real time. The temperature sensing element is installed at the beginning of the ice-melting line based on temperature and current, and is used to collect the real-time temperature signal of the ice-melting line.

[0012] In a preferred embodiment of the mobile ice-melting device for power distribution networks described in this invention: the intelligent control unit is electrically connected to the current transformer and the temperature sensing element based on temperature and current to obtain detection signals, and the signal output terminal is electrically connected to the control terminal of the rectifier unit based on temperature and current. The intelligent control unit has pre-stored cable specifications and corresponding current values ​​for ice melting based on temperature and current. It can adaptively output control signals to the rectifier unit based on temperature and current through a PID adjustment algorithm according to the collected current signal, temperature signal and corresponding current value for ice melting, thereby realizing closed-loop dynamic control of the current of the ice melting line.

[0013] To address the aforementioned issues, a temperature- and current-based de-icing method is proposed, including the aforementioned mobile de-icing device for power distribution networks. The specific steps are as follows: Initial current ramp-up phase: Gradually ramp up to the de-icing current; De-icing stage: Maintain the de-icing current and monitor the temperature of the de-icing circuit in real time. When the temperature is higher than the set temperature TM, adjust the output to reduce the current. End of ice melting stage: When the ice melting is finished, adjust the output to reduce the current to 0.

[0014] The beneficial effects of this invention are as follows: This invention achieves rapid response and flexible deployment of de-icing operations for power distribution lines in mountainous areas through a mobile operation method, effectively solving the problem of low efficiency of traditional manual de-icing, improving de-icing efficiency, reducing power outage maintenance time, and reducing economic losses caused by power outages. At the same time, the output current and temperature can be matched according to the cable specifications to ensure the de-icing efficiency without damaging the cable itself, eliminating safety risks and improving the safety of the operation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein: Figure 1 A structural diagram of a mobile de-icing device for power distribution networks is shown. Figure 2 A structural diagram of the de-icing section in a mobile de-icing device for power distribution networks is shown. Figure 3 The circuit diagram of a mobile ice-melting device for power distribution networks is shown. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0018] It should be noted that icing on power distribution lines in mountainous areas during winter is a significant issue that threatens the safe operation of these lines. Due to the lack of de-icing equipment specifically designed for these lines, every winter power supply companies have to send a large number of personnel to manually knock off the ice along the lines. This manual de-icing work is inefficient and poses significant safety hazards.

[0019] Reference Figure 1-2 This embodiment provides a mobile ice-melting device for power distribution networks, including: At least three high-voltage cables 1; The three high-voltage cables 1 are respectively labeled as line A, line B and line C, and each high-voltage cable 1 is equipped with a tension clamp 11, which controls the current flow. The core of this design lies in achieving flexible switching between power supply and de-icing: when the tension clamp 11 is in the "on" state, the three high-voltage cables 1 maintain a complete circuit, meeting the normal power supply needs of the area and avoiding power outages for users in non-iced areas caused by de-icing operations; when the tension clamp 11 is in the "off" state, each high-voltage cable 1 can be separated into a live power supply line and a non-live de-icing line. Part 2, the ice-melting section, includes: The current-draining unit 21 is used to introduce high-voltage AC power from the power supply line as the input power for ice melting. It includes at least three flexible conductors A211, which are paired with three power supply lines one by one. A high-voltage switch 212 is provided on the flexible conductor A211. The moving end of the high-voltage switch 212 is electrically connected to one end of the flexible conductor A211, and the stationary end is electrically connected to the high-voltage winding input end of the transformer unit 22. The three flexible conductors A211 are equivalent to three-phase power. By utilizing the load balancing characteristics of three-phase power, the current fluctuations and equipment overload caused by single-phase connection are solved, ensuring the stability of the input power. The selection of flexible conductor A211 is more suitable for the complex route of mountain lines, making it easy for operators to quickly connect and obtain power between different towers. High voltage switch 212 has the dual functions of power isolation and short circuit protection. It can disconnect the connection with the power supply line before de-icing operations to ensure the safety of commissioning. When a short circuit fault occurs in the subsequent circuit, it can quickly trip and cut off the power supply to prevent the fault from expanding and damaging the equipment or affecting the power supply line.

[0020] Transformer unit 22, whose high-voltage side is electrically connected to current-draining unit 21, is used to convert the introduced high-voltage AC power into low-voltage AC power. Specifically, a 10 / 0.4kV power transformer is selected, with a capacity range of 100-200kVA. 10kV is a common voltage level for mountain distribution networks. Selecting a 10 / 0.4kV transformer can match the voltage of the power supply line and reduce the high-voltage power to a safe and suitable low voltage for de-icing. The capacity of 100-200kVA takes into account factors such as the conductor cross-section and ice thickness of the mountain distribution network lines, which can provide sufficient de-icing power (ensuring Joule heating effect) while avoiding bulky equipment size.

[0021] The rectifier unit 23 has its AC input terminal electrically connected to the low-voltage side of the transformer unit 22. It is used to rectify the low-voltage AC power after transformation into DC power. Compared with AC power, DC power does not have the skin effect when it is transmitted in the conductor, and the current distribution is more uniform, which can make the overall heating efficiency of the conductor higher. At the same time, the stability of DC current can avoid the heat fluctuation caused by the periodic changes of AC power and improve the melting rate. Output unit 24 is used to feed the rectified DC power into the ice melting circuit, so that a continuous DC current passes through the ice melting circuit, and the Joule heating effect is used to generate heat in the circuit itself, and the ice is melted through heat conduction. The output unit 24 includes at least two flexible wires B241 and a jumper wire 242. The two flexible wires B241 are a positive wire and a negative wire, respectively. The positive wire is connected to the starting end of the de-icing circuit on line A, and the negative wire is connected to the starting end of the de-icing circuit on line B alone, or the starting ends of the de-icing circuits on line B and line C are connected in parallel. The jumper wire 242 electrically connects the ends of the de-icing circuits on line A and line B, or the ends of the de-icing circuits on line A, line B, and line C to form a circuit. A low-voltage switch 243 is provided on the flexible wires B241.

[0022] When the icing area is small, lines A and B can be melted separately. When multiple lines are iced at the same time, lines B and C are connected in parallel to form a circuit with line A to achieve simultaneous melting of multiple lines and improve work efficiency. The shorting wire 242 ensures that the melting circuit forms a complete DC circuit, ensuring that the current continues to pass through the conductor to generate heat. The low-voltage switch 243 is used to control the on and off of the melting circuit, which allows the operator to flexibly start and stop according to the melting progress. At the same time, the circuit is cut off after the operation to ensure the safety of disconnection.

[0023] Mobile carrier 3 is used to carry the ice-melting part 2. It is mobile and can be quickly deployed to the site.

[0024] In response to the characteristics of narrow roads and complex terrain in mountainous areas, the mobile carrier 3 can be a small truck, ATV (all-terrain vehicle) or towed trailer, etc. Its mobility solves the problem that traditional fixed ice melting equipment is difficult to reach the mountainous site.

[0025] During operation: The de-icing section 2 is quickly deployed to the required de-icing area using the mobile carrier 3. The operator controls the tension clamp 11 to disconnect. After disconnection, the three flexible conductors A211 are connected to the power supply line respectively to provide power for the de-icing operation. Then, the two flexible conductors B241 are connected to the starting end of the de-icing line. At the same time, at the end of the de-icing line, the de-icing line connecting the two flexible conductors B241 is connected with the jumper wire 242 to form a current path. When connecting the power, the high-voltage switch 212 and the low-voltage switch 243 are in the closed state. They are turned on after the wiring is completed. When energized, the high-voltage AC power is converted and rectified into low-voltage DC power. The DC current generates Joule heat through the de-icing circuit, and the heat is continuously conducted to the ice on the surface of the conductor, causing the ice to melt gradually from the outer layer to the inner layer. After the ice has completely melted, the low-voltage switch 243 is first disconnected to cut off the de-icing circuit, and then the high-voltage switch 212 is disconnected to cut off the power input. Subsequently, the shorting wire 242, flexible conductor B241, and flexible conductor A211 are removed in sequence. Finally, the tension clamp 11 is operated to restore the closed state, so that the line can form a complete power supply path again, completing the entire de-icing operation.

[0026] This design enables rapid response and flexible deployment of de-icing operations on power distribution lines in mountainous areas through a mobile operation mode. It effectively solves the problem of low efficiency in traditional manual de-icing, improves de-icing efficiency, reduces power outage maintenance time, and reduces economic losses caused by power outages. It supports de-icing of single or multiple lines, with de-icing efficiency several times higher than manual methods, and can control the development of icing in a timely manner.

[0027] As an optional embodiment: It should be noted that the high-voltage cables used in mountain power distribution networks have different specifications in terms of conductor cross-section and material (such as aluminum core and copper core). Different specifications of cables have different DC resistance values. According to Joule's law, the parameters required to achieve the ideal de-icing effect (such as current intensity and duration) also vary. If the current value and temperature of the de-icing line cannot be monitored in real time during the de-icing operation, there may be problems such as current overload leading to aging and damage of the conductor insulation layer, or insufficient current leading to incomplete de-icing. At the same time, it may cause safety risks such as equipment burnout and line short circuit.

[0028] Reference Figure 3 In one embodiment provided in this application, the ice-melting portion 2 further includes, The detection unit 25 collects the operating parameters of the ice melting circuit in real time, providing status feedback for subsequent control. The intelligent control unit 26, based on the feedback data from the detection unit 25, performs closed-loop control of the operating status of the transformer unit 22 and the rectifier unit 23, thereby achieving adaptive adjustment of the ice melting process.

[0029] The detection unit 25 consists of a current transformer 251 and a temperature sensing element 252. The current transformer 251 is connected in series between the output of the rectifier unit 23 and the ice melting circuit. It is used to collect the working current signal of the ice melting circuit in real time. A through-type current transformer with a precision of 0.5 class is selected. The range covers 0-500A. It can accurately collect the working current signal of the ice melting circuit with an error controlled within ±1%, avoiding the control deviation caused by inaccurate current monitoring. The temperature sensing element 252 adopts a contact-type PT100 platinum resistance sensor, which is installed at the beginning of the de-icing line. The temperature measurement range is -50℃ to 150℃, and the response time is ≤1 second. It can capture the temperature change of the conductor in real time, reflect the progress of ice melting and the heating status of the conductor in a timely manner, and avoid safety hazards caused by temperature monitoring lag. The signal input terminal of the intelligent control unit 26 is electrically connected to the current transformer 251 and the temperature sensing element 252 to obtain detection signals, and the signal output terminal is electrically connected to the control terminal of the rectifier unit 23. The intelligent control unit 26 has a pre-stored cable specification and ice melting current database. Based on the collected current signal, temperature signal and ice melting current value, it can adaptively output control signal to the rectifier unit 23 through PID adjustment algorithm, thereby realizing closed-loop dynamic control of the ice melting line current.

[0030] Specifically, the intelligent control unit 26 adjusts the output current of the device by monitoring feedback signals of current and temperature, and adaptively adjusts to the required ice-melting current parameters through a PID algorithm, thereby achieving efficient and safe ice-melting operation; For cables of different specifications, their de-icing current values ​​can be obtained from the de-icing current database; Depend on It can be seen that adjusting the output voltage U of the rectifier unit 23 can adjust the cable current I; The output voltage U of the rectifier unit 23 can be adjusted by adjusting its control signal IK, and IK and U are in a corresponding relationship; R is the resistance value of the de-icing circuit. This parameter is unknown and varies depending on the cable specifications, length, and wiring method. The PID algorithm calculates the correspondence between the control signal IK and the current I of the ice-melting line by actual measurement of the ice-melting line current, so as to accurately set the required ice-melting current value and realize adaptive adjustment for cables of different specifications.

[0031] The intelligent control unit 26 employs a two-level safety protection mechanism: Safety protection refers to the protective measures implemented to prevent damage to the de-icing device caused by prolonged overcurrent or short circuit. These measures specifically include: Overcurrent protection: When the output current exceeds the device's allowable current, the circuit breaker will trip after a delay; Short circuit protection: When the output current exceeds the short circuit protection setting value, the circuit breaker will trip instantly without delay.

[0032] Current and temperature are two important parameters in the process of de-icing on power lines. The magnitude of the current determines the heat generated by the conductor, which in turn affects the temperature rise of the conductor and ultimately affects the de-icing effect.

[0033] After the operation is started, the detection unit 25 synchronously collects the de-icing current and the conductor temperature. The intelligent control unit 26 calls the ideal de-icing current of the current cable in the database, compares the real-time parameters with the ideal value, and calculates the deviation through the PID algorithm. Then, it outputs a 0-10V voltage signal or a 4-20mA current signal to the rectifier unit 23 to adjust its output voltage U to change the de-icing current I. At the same time, it completes the monitoring, comparison and adjustment closed loop in real time until the ice is completely melted.

[0034] This design can automatically match the corresponding output current and temperature according to the cable specifications, ensuring de-icing efficiency without damaging the cable itself, eliminating safety risks and improving operational safety.

[0035] As an optional embodiment: In one embodiment provided in this application, a temperature- and current-based de-icing method is provided, including the mobile de-icing device for power distribution networks as described above. The specific steps are as follows: Initial current ramp-up phase: Gradually ramp up to the de-icing current; De-icing stage: Maintain the de-icing current and monitor the temperature of the de-icing circuit in real time. When the temperature is higher than the set temperature TM, adjust the output to reduce the current. Specifically, the control methods are as follows: The intelligent control unit 26 is powered on and initialized. The control signal IK1mA is calculated, where IK1mA refers to the increase in output current corresponding to a 1mA increase in the control signal. The control signal output IK = 5mA is set, and the output current value I1 is measured. The control signal output IK = 6mA, and the output current value I2 is measured. The control signal output is IK=7mA, and the output current value I3 is measured. Based on the above measured values, the control signal is calculated as follows: Calculate the control signal IKR value: In the formula: IR is a built-in parameter, representing the wire de-icing current value; Based on the set current rise time t1, the control signal output is gradually adjusted from 0 to the set value IKR. The current rise time t1 is usually set to 1 minute. When the current rises to the set value, it continues to operate and monitors the conductor temperature in real time; When the conductor temperature exceeds the set upper limit TM, the control signal output IKR is automatically reduced to IKB. Preferably, TM = 15℃-20℃. IB is a built-in parameter, representing the conductor current protection value.

[0036] End of ice melting stage: When the ice melting is finished, adjust the output to reduce the current to 0.

[0037] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A mobile ice-melting device for power distribution networks, characterized in that: include, At least three high-voltage cables (1); The three high-voltage cables (1) are respectively identified as line A, line B and line C, and each of the high-voltage cables (1) is provided with a tension clamp (11) to control the current on / off; Normal power supply is generally guaranteed. If the power supply is interrupted, each of the high-voltage cables (1) is separated into a live power supply line and a non-live de-icing line in order to carry out local de-icing operations; The melting part (2) includes, The diversion unit (21) is used to introduce high-voltage AC power from the power supply line as the input power for ice melting; The transformer unit (22) is electrically connected to the current-draining unit (21) on its high-voltage side, and is used to convert the introduced high-voltage AC power into low-voltage AC power. The rectifier unit (23) has its AC input terminal electrically connected to the low-voltage side of the transformer unit (22) and is used to rectify the low-voltage AC power after transformation into DC power. The output unit (24) is used to feed the rectified DC power into the ice melting circuit, so that the ice melting circuit is continuously filled with DC current, and the Joule heating effect is used to generate heat in the circuit itself, and the ice is melted through heat conduction. The mobile carrier (3) is used to carry the ice melting part (2), and is mobile, making it easy to quickly deploy to the site.

2. The mobile de-icing device for power distribution networks according to claim 1, characterized in that: The diversion unit (21) includes at least three flexible conductors A (211), and the three flexible conductors A (211) are respectively paired with three power supply lines.

3. The mobile de-icing device for power distribution networks according to claim 2, characterized in that: The flexible conductor A (211) is equipped with a high-voltage switch (212). The moving end of the high-voltage switch (212) is electrically connected to one end of the flexible conductor A (211), and the stationary end is electrically connected to the input end of the high-voltage winding of the transformer unit (22), thus serving the dual functions of power isolation and short-circuit protection.

4. The mobile de-icing device for power distribution networks according to claim 3, characterized in that: The transformer unit (22) is a 10 / 0.4kV power transformer with a capacity range of 100-200kVA.

5. The mobile de-icing device for power distribution networks according to claim 4, characterized in that: The output unit (24) includes at least two flexible wires B (241) and a jumper wire (242). The two flexible conductors B (241) are a positive wire and a negative wire, respectively. The positive wire is connected to the starting end of the ice-melting line on line A, and the negative wire is connected separately to the starting end of the ice-melting line on line B, or the starting ends of the ice-melting lines of line B and line C are connected in parallel. The shorting wire (242) electrically connects the ends of the ice-melting circuits of Line A and Line B, or the ends of the ice-melting circuits of Line A, Line B, and Line C, to form a circuit.

6. The mobile de-icing device for power distribution networks according to claim 5, characterized in that: The flexible conductor B (241) is equipped with a low-voltage switch (243).

7. The mobile de-icing device for power distribution networks according to claim 6, characterized in that: The ice-melting section (2) also includes, The detection unit (25) collects the operating parameters of the ice melting circuit in real time and provides status feedback for subsequent control. The intelligent control unit (26) performs closed-loop control of the operating status of the transformer unit (22) and the rectifier unit (23) based on the feedback data of the detection unit (25), thereby realizing adaptive adjustment of the ice melting process.

8. The mobile de-icing device for power distribution networks according to claim 7, characterized in that: The detection unit (25) consists of a current transformer (251) and a temperature sensing element (252), wherein the current transformer (251) is connected in series between the output terminal of the rectifier unit (23) and the ice melting circuit, and is used to collect the working current signal of the ice melting circuit in real time. The temperature sensing element (252) is installed at the beginning of the ice melting line to collect the real-time temperature signal of the ice melting line.

9. The mobile de-icing device for power distribution networks according to claim 8, characterized in that: The signal input terminal of the intelligent control unit (26) is electrically connected to the current transformer (251) and the temperature sensing element (252) respectively to obtain detection signals, and the signal output terminal is electrically connected to the control terminal of the rectifier unit (23). The intelligent control unit (26) has pre-stored cable specifications and corresponding current values ​​for ice melting. Based on the collected current signal, temperature signal and corresponding current value for ice melting, it can adaptively output control signals to the rectifier unit (23) through a PID adjustment algorithm, thereby realizing closed-loop dynamic control of the current of the ice melting line.

10. A temperature- and current-based de-icing method, comprising a mobile de-icing device for power distribution networks as described in any one of claims 1-9, characterized in that: The specific steps are as follows: Initial current ramp-up phase: Gradually ramp up to the de-icing current; De-icing stage: Maintain the de-icing current and monitor the temperature of the de-icing circuit in real time. When the temperature is higher than the set temperature TM, adjust the output to reduce the current. End of ice melting stage: When the ice melting is finished, adjust the output to reduce the current to 0.

Images