Switching device for current collection line ice melting system and current collection line ice melting system

Abstract

The invention belongs to the technical field of power transmission line disaster prevention, and particularly relates to a switching device for a current collection line ice melting system and the current collection line ice melting system.The current collection line ice melting system comprises a remote controller, the switching device is connected between a current collection line and power generation equipment, and the switching device comprises a box body; the circuit breaker is installed in the box body, the circuit breaker has a first working state and a second working state, in the first working state, the current collection circuit and the power generation equipment are connected, in the second working state, the current collection circuit and the power generation equipment are disconnected, and three-phase short circuit of the current collection circuit is achieved; and the communication control module is arranged in the box body, is in communication connection with the circuit breaker and is used for switching the working state of the circuit breaker under the condition that a remote control signal sent by the remote controller is received. According to the switching device, the working state of the circuit breaker can be switched through the remote controller, so that the ice melting device can conveniently carry out ice melting operation on the current collection circuit.

Description

Technical Field

[0001] The invention belongs to the technical field of disaster prevention of power transmission lines, and in particular relates to a switch device for a collector line ice melting system and a collector line ice melting system. Background Art

[0002] The collector line mainly refers to the line that transmits electricity from distributed energy generation facilities such as wind power and solar power to booster substations or switch stations. Wind farms are mostly located in high-altitude micro-topography areas. In winter, wind turbines, transmission lines, overhead collector lines and other equipment are prone to severe icing, which eventually leads to large-scale grid disconnection. The overhead collector line of a wind farm has a low voltage level, a small conductor cross-section, and equivalent resistance and reactance. AC ice melting can be carried out according to the actual line length and line type.

[0003] In the prior art, in order to melt the ice on the collector lines, AC ice melting devices are usually installed at the booster station. The ice melting power is taken from the busbar of the booster station, and the power is transmitted from the booster station to the collector line in reverse. When melting the ice, disconnect the connection between the low-voltage side of the box transformer and the converter, and perform a three-phase short circuit at the end of the line to achieve AC ice melting on the collector line. However, each wind farm consists of multiple collector lines. When melting the ice on different collector lines, they need to be short-circuited on different hills several kilometers away. It is difficult to implement on-site short circuiting after the road is frozen. Summary of the invention

[0004] The object of the present invention is to provide a switch device for a collector line ice melting system and a collector line ice melting system, so as to remotely control a circuit breaker so as to perform energizing and ice melting operations on the collector line.

[0005] In order to achieve the above-mentioned objectives, on one hand, the present invention provides a switch device for a collector line ice melting system, the collector line ice melting system includes a remote controller, the switch device is connected between the collector line and the power generation equipment, the switch device includes: a box body; a circuit breaker, installed in the box body, the circuit breaker has a first working state and a second working state, in the first working state, the collector line and the power generation equipment are connected, in the second working state, the collector line and the power generation equipment are disconnected, and the three phases of the collector line are short-circuited; a communication control module, installed in the box body, is communicatively connected to the circuit breaker and is used to switch the working state of the circuit breaker when a remote control signal sent by the remote controller is received.

[0006] In some embodiments, the communication control module includes: a communication unit, which is communicatively connected to the remote controller and is used to send a control signal to the circuit breaker according to a control instruction of the remote controller; and a filtering unit, which is used to suppress electromagnetic interference generated by the power generation equipment.

[0007] In some embodiments, the communication unit and the remote controller are connected via a 4G communication network and an optical fiber.

[0008] In some embodiments, the circuit breaker includes an incoming line terminal and an outgoing line terminal, and the communication control module also includes: a lightning arrester connected to the incoming line terminal of the circuit breaker and used to discharge the strong current generated after a lightning strike; a monitoring unit, used to monitor the operating status of the lightning arrester in real time and transmit the monitoring signal to the remote controller.

[0009] In some embodiments, the communication control module also includes: a switch protection unit, which is communicatively connected to the circuit breaker and the communication unit, and the switch protection unit is configured to: monitor the working state of the circuit breaker in real time; when the circuit breaker is in the second working state, obtain a control signal sent by the communication unit; determine whether the circuit breaker is accidentally touched according to the control signal; and when it is determined that the circuit breaker is accidentally touched, switch the circuit breaker to the first working state.

[0010] In some embodiments, the switch device further comprises: a backup power supply for providing backup power to the circuit breaker and the communication control module.

[0011] In some embodiments, a support frame is provided on the inner wall of the box, a plurality of support insulators are provided on the support frame, the circuit breaker includes a plurality of vacuum arc chambers and a plurality of current transformers installed on the vacuum arc chambers, the plurality of current transformers correspond to the plurality of support insulators one by one, and the current transformers are connected to the corresponding support insulators through support rods.

[0012] In some embodiments, a moving contact connected to a collector line and a stationary contact connected to a power generation device are installed in the vacuum arc chamber, and an output terminal connected to the moving contact is also provided on the top of the vacuum arc chamber. The circuit breaker also includes: a short-circuit plate, which is arranged at intervals above the vacuum arc chamber and is used to separate the collector line or short-circuit the three phases of the collector line; a driving mechanism, which is communicatively connected to the communication control module, and the communication control module can control the start and stop of the driving mechanism according to a remote control signal, and the driving mechanism is used to drive the moving contact to move, so as to drive the moving contact to separate or connect with the stationary contact.

[0013] In some embodiments, the box body is made of stainless steel, the protection level of the box body is greater than or equal to IP54, the rated voltage is 35kV, and the rated current is 1250A.

[0014] A second aspect of the present invention provides a collector line ice melting system, comprising: Remote controller; The above switch device for the collector line ice melting system; The ice melting device is connected to the remote controller in communication and installed at the transformer end of the collector line. The ice melting device is used to convert the electric energy at the transformer end and transmit the ice melting current to the collector line.

[0015] In the above technical solution, the collector line ice-melting system includes a remote controller, and the switch device for the collector line ice-melting system is connected between the collector line and the power generation equipment. The switch device includes a box, a circuit breaker and a communication control module. The circuit breaker and the communication control module are both installed in the box. The circuit breaker has a first working state and a second working state. When the circuit breaker is in the first working state, the circuit breaker connects the collector line with the power generation equipment. When the circuit breaker is in the second working state, the circuit breaker disconnects the collector line from the power generation equipment and short-circuits the three phases of the collector line. The communication control module can communicate with the remote controller. When receiving the remote control signal sent by the remote controller, the communication control module can control the circuit breaker to switch the working state. By using the above switch device for the collector line ice-melting system, the working state of the circuit breaker can be remotely switched to facilitate efficient ice-melting operations on the collector line.

[0016] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative work. In the accompanying drawings: Figure 1 The present invention is a structural block diagram of a switch device for a collector line ice melting system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0019] The switch device for a collector line ice melting system and the collector line ice melting system according to the present invention will be described below with reference to the accompanying drawings.

[0020] like Figure 1 , which is a structural block diagram of a switch device for a collector line de-icing system according to an embodiment of the present invention. The collector line de-icing system includes a remote controller, a switch device connected between the collector line and the power generation equipment, and the switch device includes: Box; A circuit breaker is installed in the box, and the circuit breaker has a first working state and a second working state. In the first working state, the collector line and the power generation equipment are connected, and in the second working state, the collector line and the power generation equipment are disconnected and the three phases of the collector line are short-circuited; The communication control module is installed in the box, is connected to the circuit breaker for communication, and is used to switch the working state of the circuit breaker when receiving a remote control signal sent by a remote controller.

[0021] The collector line is a line between the power generation equipment and the booster substation or switch station, which can transmit the electric energy generated by the power generation equipment. However, wind farms are mostly located in high-altitude areas, and the collector lines connecting the wind farms are prone to ice accumulation, which can cause failures in the transmission lines. Therefore, it is often necessary to transmit ice-melting current from the booster station end to melt the ice by generating heat through conduction. However, when performing ice-melting operations, it is usually necessary to disconnect the collector line from the power generation equipment, and it is necessary to short-circuit the three phases of the collector line at one end close to the power generation equipment. However, the altitude of the power generation equipment is high, and it is difficult to switch the working state of the circuit breaker at the power generation equipment, and the cost is high. An embodiment of the present invention provides a switch device for a collector line ice melting system, which can remotely control the collector line to switch the working state.

[0022] Specifically, the switch device includes a box, a circuit breaker and a communication control module, wherein the circuit breaker and the communication control module are both installed in the box, and the box protects the circuit breaker and the communication control module from the external environment, and also prevents outsiders from accidentally touching the circuit breaker and the control module in the box. The circuit breaker has two working states. In the first working state, the circuit breaker can conduct the collector line and the power generation equipment. In the second working state, the circuit breaker disconnects the connection between the collector line and the power generation equipment and short-circuits the three phases of the collector line. The remote control module can receive the communication connection of the remote controller in the collector line de-icing system, and the remote controller can send a remote control instruction to the communication control module. The communication control module switches the working state of the circuit breaker according to the remote control instruction to realize the remote switching of the working state of the circuit breaker. By adopting the above-mentioned switch device, the working state of the circuit breaker can be controlled by the remote controller, making it more convenient to perform de-icing operations on the collector line. In addition, by remotely controlling the switching of the circuit breaker working state, it is prevented from human operation of opening and closing the collector line, reducing the safety hazards of de-icing operations.

[0023] In one embodiment, the communication control module includes: a communication unit and a filtering unit. The communication unit is communicatively connected to the remote controller and is used to send a control signal to the circuit breaker according to the control instruction of the remote controller. The filtering unit is used to suppress the electromagnetic interference generated by the power generation equipment. The power generation equipment usually generates a large current through electromagnetic principles, which leads to a strong electromagnetic interference signal near the power generation equipment, and often causes the communication of external signals at this location to be interfered. The communication control module of the embodiment of the present invention includes a communication unit and a filtering unit. The communication unit can be communicatively connected to the remote controller, and the filtering unit can suppress the electromagnetic interference generated by the power generation equipment so that the communication unit can communicate and interact with the remote controller normally. The above-mentioned communication control module is adopted to make the communication connection between the communication unit and the remote controller more stable.

[0024] In one embodiment, a 4G communication network and an optical fiber are connected between the communication unit and the remote controller. Both the optical fiber and the 4G communication network can be used to transmit remote control signals. If one communication mode is used, disasters or electromagnetic interference may cause the communication to be disconnected, which may lead to maintenance difficulties. The embodiment of the present invention provides two signal transmission modes, optical fiber and 4G communication network, which can make the communication between the remote controller and the communication unit more stable.

[0025] In one embodiment, the communication unit and the remote controller communicate with each other via satellite short messages. The above switch device can ensure that the communication unit and the remote controller can communicate in extremely severe conditions.

[0026] In one embodiment, the circuit breaker includes an incoming line terminal and an outgoing line terminal, and the communication control module also includes: a lightning arrester and a monitoring unit, the lightning arrester is connected to the incoming line terminal of the circuit breaker and is used to discharge the strong current generated after the lightning strike, and the monitoring unit is used to monitor the operating status of the lightning arrester in real time and transmit the monitoring signal to the remote controller. Wind turbines and other power generation equipment are susceptible to lightning strikes, and the lightning current generated by the lightning strike will be transmitted to the circuit breaker connected to the wind turbine. In order to prevent the lightning current from damaging the circuit breaker, the embodiment of the present invention adds a lightning arrester to the communication control module, which can discharge the strong current generated after the lightning strike to protect other components in the circuit breaker. The detection unit can monitor the operating status of the lightning arrester and transmit the monitoring signal to the remote controller so that the remote controller can obtain the operating status of the lightning arrester in real time.

[0027] In one embodiment, the communication control module further includes a switch protection unit that is communicatively connected to the circuit breaker and the communication unit, and the switch protection unit is configured to: monitor the working state of the circuit breaker in real time; obtain a control signal sent by the communication unit when the circuit breaker is in the second working state; determine whether the circuit breaker is accidentally touched according to the control signal, specifically, determine whether the communication unit has received a remote control signal sent by a remote controller according to the control signal, and determine that the circuit breaker is accidentally touched when it is determined that the remote control signal is not received; and switch the circuit breaker to the first working state when it is determined that the circuit breaker is accidentally touched. The switch protection unit is communicatively connected to the circuit breaker, and can prevent the circuit breaker from accidentally touching and causing the circuit breaker to switch its working state, and prevent external factors from interfering with the operation of the circuit breaker.

[0028] In one embodiment, the switch device further includes: a backup power supply for providing backup power for the circuit breaker and the communication control module. The circuit breaker and the communication control module are powered by power generation equipment under normal conditions, but the power generation equipment is often shut down for maintenance or failure. Therefore, the switch device of the embodiment of the present invention is provided with a backup power supply to provide backup power for the circuit breaker and the communication control module, so that the switch device can still work normally when the power generation module is shut down. In a specific embodiment, the life of the backup power supply exceeds three years, the standby time exceeds ten days, and it can meet the control of the circuit breaker switch more than five times.

[0029] In one embodiment, Figure 1 As shown, the inner wall of the box is provided with a support frame, and a plurality of support insulators are provided on the support frame. The circuit breaker includes a vacuum arc chamber and a plurality of current transformers installed on the vacuum arc chamber. The plurality of current transformers correspond to the plurality of support insulators one by one, and the current transformers are connected to the corresponding support insulators through support rods. The vacuum arc chamber is the core component of the circuit breaker, which is used to disconnect the current in the circuit and extinguish the arc generated when the circuit is disconnected to ensure the safe disconnection of the circuit. The current can monitor the current passing through the vacuum arc chamber in real time to help the operating personnel understand the operating status of the power system, such as the load condition. A support frame is provided on the inner wall of the box, and the support frame can support the current transformer to be set on the vacuum arc chamber to prevent the vacuum arc chamber from being damaged by force. A plurality of support insulators are provided on the upper ring of the support frame, and the support insulators can insulate the box from the current transformer to prevent the box from interfering with the detection of the current transformer.

[0030] In one embodiment, a moving contact connected to the collector circuit and a stationary contact connected to the power generation equipment are installed in the vacuum interrupter, and an outlet terminal connected to the moving contact is also provided on the top of the vacuum interrupter. The circuit breaker also includes a short-circuit plate and a drive mechanism. The short-circuit plate is arranged above the vacuum interrupter and is used to separate the collector circuit or short-circuit the three-phase collector circuit. The drive mechanism is connected to the communication control module for communication. The communication control module can control the start and stop of the drive mechanism according to the remote control signal. The drive mechanism is used to drive the moving contact to move, so as to drive the moving contact to separate or connect with the stationary contact, thereby disconnecting or connecting the collector circuit with the power generation equipment. The separation of the moving contact and the stationary contact can disconnect the collector circuit from the power generation equipment, and the connection of the moving contact and the stationary contact can make the collector circuit and the power generation equipment conductive. When the stationary contact is disconnected from the moving contact, the moving contact can drive the outlet terminal to connect with the short-circuit plate to realize the three-phase short-circuit of the collector circuit. The above-mentioned switch device can be used to control the movement of the moving contact and the outlet terminal in a synchronous manner, so that the movement is more coherent and the structure is more compact.

[0031] In one embodiment, the box is made of stainless steel, the protection level of the box is greater than or equal to IP54, the rated voltage is 35kV, and the rated current is 1250A. The above box can provide safety protection for the collector line with a rated voltage of 35kV and a rated current of 1250A, and can reduce the corrosion of the external environment on the internal components of the box.

[0032] In one embodiment, a collector line ice melting system is provided, comprising: a remote controller; the switch device for the collector line ice melting system; an ice melting device, which is communicatively connected to the remote controller and installed at the transformer end of the collector line, and the ice melting device is used to convert the electric energy at the transformer end and transmit ice melting current to the collector line. By using the collector line ice melting system, the switch device can be remotely controlled to conduct the collector line and the power generation equipment, or to short-circuit the three phases of the collector line, so that the ice melting device can be more convenient to perform ice melting operations, thereby accelerating the efficiency of disaster relief.

[0033] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0036] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A switch device for a collector line ice melting system, characterized in that: The collector line ice melting system includes a remote controller, the switch device is connected between the collector line and the power generation equipment, and the switch device includes: Box; A circuit breaker is installed in the box, and the circuit breaker has a first working state and a second working state. In the first working state, the collector line and the power generation equipment are connected, and in the second working state, the collector line and the power generation equipment are disconnected, and the three phases of the collector line are short-circuited; The communication control module is installed in the box, is connected to the circuit breaker for communication, and is used to switch the working state of the circuit breaker when receiving a remote control signal sent by a remote controller.

2. The switch device for the collector line ice melting system according to claim 1, characterized in that: The communication control module comprises: a communication unit, connected to the remote controller for sending a control signal to the circuit breaker according to a control instruction of the remote controller; The filter unit is used to suppress the electromagnetic interference generated by the power generation equipment.

3. The switch device for the collector line ice melting system according to claim 2, characterized in that: The communication unit and the remote controller are connected via a 4G communication network and an optical fiber.

4. The switch device for the collector line ice melting system according to claim 2, characterized in that: The circuit breaker includes an inlet terminal and an outlet terminal, and the communication control module also includes: A lightning arrester, connected to the incoming line terminal of the circuit breaker and used to discharge the strong current generated by lightning strike; The monitoring unit is used to monitor the operating status of the arrester in real time and transmit a monitoring signal to the remote controller.

5. The switch device for the collector line ice melting system according to claim 2, characterized in that: The communication control module also includes: A switch protection unit is communicatively connected with the circuit breaker and the communication unit, and the switch protection unit is configured as follows: Real-time monitoring of the working status of the circuit breaker; When the circuit breaker is in the second working state, acquiring the control signal sent by the communication unit; determining whether the circuit breaker is mistakenly triggered according to the control signal; When it is determined that the circuit breaker is mistakenly touched, the circuit breaker is switched to a first working state.

6. The switch device for the collector line ice melting system according to claim 1, characterized in that: The switch device further comprises: A backup power supply is used to provide backup power to the circuit breaker and the communication control module.

7. The switch device for a collector line ice melting system according to any one of claims 1 to 6, characterized in that: The inner wall of the box body is provided with a supporting frame, and a plurality of supporting insulators are provided on the supporting frame. The circuit breaker includes a plurality of vacuum arc extinguishing chambers and a plurality of current transformers installed on the vacuum arc extinguishing chambers. The plurality of current transformers correspond to the plurality of supporting insulators one by one, and the current transformers are connected to the corresponding supporting insulators through supporting rods.

8. The switch device for the collector line ice melting system according to claim 7, characterized in that: A moving contact connected to the collector line and a stationary contact connected to the power generation equipment are installed in the vacuum interrupter, and an outlet terminal connected to the moving contact is also arranged on the top of the vacuum interrupter. The circuit breaker also includes: A short-circuit plate, which is arranged above the vacuum interrupter at intervals and is used to separate the collector line or short-circuit the three phases of the collector line; The driving mechanism is communicatively connected with the communication control module, and the communication control module can control the start and stop of the driving mechanism according to the remote control signal. The driving mechanism is used to drive the moving contact to move, so as to drive the moving contact to separate or connect with the static contact.

9. The switch device for a collector line ice melting system according to any one of claims 1 to 6, characterized in that: The box body is made of stainless steel, the protection level of the box body is greater than or equal to IP54, the rated voltage is 35kV, and the rated current is 1250A.

10. A collector line ice melting system, characterized in that: include: Remote controller; A switch device for a collector line ice melting system according to any one of claims 1 to 8; An ice melting device is communicatively connected with the remote controller and installed at the transformer end of the collector line. The ice melting device is used to convert the electric energy at the transformer end and transmit ice melting current to the collector line.

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