An over-phase-transition transient overvoltage protection device for catenary based on edge computing

Abstract

The invention discloses an over-phase transient over-voltage protection device for catenary based on edge computing. The operating state of capacitor C1 is obtained by measuring current and temperature and combining edge computing. Meanwhile, lightning arrester F1 and lightning arrester monitor J1 are connected between high-voltage busbar M and ground. While lightning arrester F1 absorbs the transient over-voltage generated during over-phase, lightning arrester monitor J1 monitors the operating state of lightning arrester F1. The over-voltage energy is consumed by the parallel connection of a resistor and an inductor, and at the same time, a capacitor is connected in series to limit the over-voltage, improving the protection reliability. The self-powered power supply and energy storage technology is adopted, and the operation data is sent wirelessly, so that the operating state of the over-voltage protection equipment can be mastered in real time. Through the cumulative analysis of the latent faults by the operation database data in the background, the reliable operation of the equipment is further ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field, and particularly relates to a transient overvoltage protection device for catenary phase change based on edge computing. Background Art

[0002] In the process of power phase change of electric locomotives in electrified railway catenaries, articulated phase change structures are widely used. When the pantograph of the locomotive passes over the catenary of the phase change section, the arc repeatedly extinguishes and breaks down, generating very high amplitude switching overvoltages. Seriously, it may break down the insulation of the power supply network or cause the air gap discharger and insulation components on the top of the locomotive to short-circuit to the ground, even causing the traction substation to trip, seriously affecting railway operation. On the other hand, the arc generated by the overvoltage burns the contact wire, suspension wire, catenary wire, etc., which is likely to cause personal injury accidents.

[0003] Currently installed voltage suppression devices lack digital and intelligent monitoring means, unable to clarify the operating rules of railway overvoltages, and even less able to monitor the operating conditions of overvoltage suppression equipment in real time. However, this equipment is often installed in extremely remote mountainous areas, and through on-site inspections by personnel, it is often impossible to detect and eliminate equipment hidden dangers in a timely manner. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a transient overvoltage protection device for catenary phase change based on edge computing, which can reliably suppress overvoltages, and at the same time use digital and information technologies to realize stable and reliable online monitoring of the device itself and railway operating conditions, ensuring the safety of railway transportation personnel and equipment and improving the operation and maintenance management efficiency.

[0005] The present invention adopts the following technical solutions:

[0006] A transient overvoltage protection device for catenary phase change based on edge computing includes a lightning arrester F1. One end of the lightning arrester F1 is connected to the high-voltage busbar M, and the other end is connected to the ground point G through a lightning arrester monitor J. Between the lightning arrester F1 and the high-voltage busbar M, one end of a parallel-connected resistor R1 and inductor L1 is connected. The other ends of the resistor R1 and inductor L1 are sequentially connected to the ground point G through a capacitor C1 and a lightning arrester F2; a processing and communication module A and a power-taking module B are arranged on the connection cable between the capacitor C1 and the lightning arrester F2. The processing and communication module A is respectively connected to the capacitor C1 and the lightning arrester F1 through a temperature measurement unit, and the power-taking module B is connected to the processing and communication module A to provide electrical energy.

[0007] Specifically, the processing and communication module A includes a measuring coil CT1. The measuring coil CT1 is arranged on the connection cable between the capacitor C1 and the lightning arrester F2 for measuring current, and the measuring coil CT1 is connected to the processing unit.

[0008] Further, the processing unit is connected with a communication unit.

[0009] Furthermore, the processing unit and the communication unit are respectively connected with the energy storage unit of the power taking module B.

[0010] Specifically, the power taking module B includes a power taking coil CT2, and the power taking coil CT2 is arranged on the connection cable between the capacitor C1 and the lightning arrester F2 for power taking.

[0011] Further, the power taking coil CT2 is connected with the energy storage unit through a low-voltage cable via a conditioning unit.

[0012] Specifically, the energy storage unit is capacitor energy storage.

[0013] Specifically, the temperature measuring unit monitors the temperatures of the capacitor C1 and the lightning arrester F1 through infrared temperature measurement and transmits the temperature information to the processing unit.

[0014] Specifically, two ends of the lightning arrester F2 are connected in parallel with a resistor R2 and a lightning arrester F3 connected in series with each other, and a reflux point G1 is connected between the resistor R2 and the lightning arrester F3.

[0015] Specifically, the temperature measuring unit is an infrared temperature measurement module for real-time monitoring of the temperatures of the capacitor C1 and the lightning arrester F1.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] The present invention relates to an over-phase transient overvoltage protection device for catenary based on edge computing, which uses a parallel connection of a resistor and an inductor to consume overvoltage energy, a series connection of a capacitor to suppress overvoltage, combines the measurement of current and temperature with edge computing to obtain the operating state of the capacitor C1, and simultaneously connects a lightning arrester F1 and a lightning arrester monitor J1 between the high-voltage bus M and the ground. While the lightning arrester F1 absorbs the transient overvoltage generated during over-phase, the lightning arrester monitor J1 monitors the operating state of the lightning arrester F1, improving the protection reliability. The inductor L1 can share part of the power on the resistor R1, and the power taking module B powers the low-voltage part. The high-power resistor R1 and the inductor L1 are connected in parallel and then connected in series with the capacitor C1. The impedance of the inductor L1 is different at different frequencies, and the inductor L1 can share the current of the resistor R1 within a specific frequency range. The capacitor C1 can effectively suppress overvoltage. The temperature measuring unit monitors the temperatures of the capacitor C1 and the lightning arrester F1, the lightning arrester monitor J1 monitors the full current and the number of operations of the lightning arrester F1, and the processing and communication module A obtains various operation and maintenance parameters and sends them to the background, realizing high-reliability overvoltage protection and convenient operation and maintenance management.

[0018] Further, the processing unit receives the current value measured by the measuring coil CT1, and after optimized calculation, transmits voltage, temperature, and harmonic information to the communication unit. The high-precision measuring device combined with the advanced algorithm of the processing unit ensures the accuracy of the data.

[0019] Further, the communication unit transmits various operation data wirelessly, reducing the work of manually checking data on-site. By adopting self-powered power supply and energy storage technology, the operation data is sent wirelessly to real-time monitor the operation status of the overvoltage protection device. Through the cumulative analysis of the data in the background operation database, potential faults are further analyzed to ensure the reliable operation of the device.

[0020] Further, the energy storage unit supplies power to the processing unit and the communication unit. The advantage is that the energy storage unit stores the energy and then uses it, ensuring the power supply power.

[0021] Further, the power-taking coil CT2 is arranged on the cable connecting the capacitor C1 and the arrester F2 to realize on-site self-powered energy taking.

[0022] Further, a stable DC power supply is obtained through processing such as voltage regulation, rectification, and filtering by the conditioning unit.

[0023] Further, the capacitor energy storage can store energy through a weak induction current, providing reliable and sufficient electrical energy for the protection device. At the same time, it has the advantages of low self-loss and strong resistance to mechanical shock.

[0024] Further, after receiving the temperature value measured by the temperature measurement unit, the processing unit transfers the voltage, temperature, and harmonic information to the communication unit through optimized calculation. The high-precision measurement device combined with the advanced algorithm of the processing unit ensures the accuracy of the data.

[0025] Further, both ends of the resistor R2 are connected in parallel between the arresters F2 and F3 connected in series. When the line switching overvoltage level is relatively high, the current is discharged to the ground G through the arrester F2. When lightning strikes or a switching overvoltage of a relatively high level occurs in other branches, the potential at point G1 is much higher than the potential at point G, and the current is discharged to the ground G through the arrester F3, thereby achieving the function of protecting this line and other branches. The resistor R2 is connected to the return point G1 to form a protection circuit to limit the railway neutral section overvoltage.

[0026] Further, the temperature measurement unit monitors the temperatures of the capacitor C1 and the arrester F1 in real time, which can be used to know the operating conditions and can also accumulate operation data.

[0027] In summary, the present invention realizes the real-time monitoring of arresters and capacitors, improves the protection reliability, takes into account the accuracy and practicality of railway overvoltage protection applications, ensures the operation and maintenance safety, and improves the work efficiency.

[0028] Next, through the drawings and embodiments, the technical solutions of the present invention will be further described in detail. Description of the Drawings

[0029] Figure 1This is the schematic diagram of the present invention;

[0030] Figure 2 This is the flow chart of the present invention;

[0031] Figure 3 This is the specific application example diagram of the present invention.

[0032] Wherein: 1. Temperature measurement unit; 2. Processing unit; 3. Communication unit; 4. Conditioning unit; 5. Energy storage unit; A. Processing and communication module; B. Power supply module. Specific implementation manner

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, in the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0035] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0036] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0037] It should also be understood that the terms used in the specification of the present invention are merely for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0038] It should be further understood that the term "and / or" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0039] Various structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the drawings. These figures are not drawn to scale, where for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the figures and their relative sizes and positional relationships are merely exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art can design regions / layers with different shapes, sizes and relative positions according to actual needs.

[0040] The present invention provides a transient overvoltage protection device for catenary phase transition based on edge computing. By measuring current and temperature and combining edge computing, the operating state of capacitor C1 is obtained. At the same time, lightning arrester F1 and lightning arrester monitor J1 are connected between the high-voltage busbar M and the ground. While lightning arrester F1 absorbs the transient overvoltage generated during phase transition, lightning arrester monitor J1 monitors the operating state of lightning arrester F1, improving the protection reliability. The self-powered power supply and energy storage technology is adopted, and the operation data is sent wirelessly, so that the operating state of the overvoltage protection device can be grasped in real time. By analyzing the latent faults through the data accumulation of the background operation database, the reliable operation of the device is further ensured.

[0041] Please refer to Figure 1 , a transient overvoltage protection device for catenary phase transition based on edge computing of the present invention includes resistor R1, inductor L1, capacitor C1, temperature measurement unit 1, processing and communication module A, power taking module B, resistor R2, lightning arrester F1, lightning arrester monitor J1, lightning arrester F2, and lightning arrester F3.

[0042] One end of lightning arrester F1 is connected to the high-voltage busbar M, and the other end is connected to the ground point G through lightning arrester monitor J1. Lightning arrester F1 is used to absorb the transient overvoltage generated during phase transition, and lightning arrester monitor J1 is used to monitor the total current and the number of operations of lightning arrester F1.

[0043] One end of the parallel connection of resistor R1 and inductor L1 is connected to the high-voltage busbar M, and the other end is divided into two paths after passing through capacitor C1, processing and communication module A, and power-taking module B in sequence. One path is connected to the grounding point G through lightning arrester F2. The parallel connection of the resistor and the inductor is used to consume the overvoltage energy, and the capacitor is used to suppress the overvoltage. The other path is connected to the return point G1 through resistor R, and a lightning arrester F3 is connected in series between the grounding point G and the return point G1.

[0044] The processing and communication module A includes a measuring coil CT1, a processing unit 2, and a communication unit 3.

[0045] The measuring coil CT1 is arranged on the connection cable between the capacitor C1 and the lightning arrester F2 to measure the current. The lightning arrester F1 and the capacitor C1 are respectively connected to the temperature measuring unit 1. After measuring the temperature through the temperature measuring unit 1, it is sent to the processing unit 2. The processing unit 2 is respectively connected to the measuring coil CT1 and the energy storage unit 5 of the power-taking module B through low-voltage cables, obtains the current measurement value through the measuring coil CT1, and takes energy through the energy storage unit 5. The processing unit 2 is connected to the communication unit 3 through a signal line, is used to process the measurement value and send it to the communication unit 3. The communication unit 3 is connected to the energy storage unit 5 through a low-voltage cable to take energy, and the communication unit 3 transmits relevant information to the background through wireless communication.

[0046] Among them, the temperature measuring unit 1 monitors the temperatures of the capacitor C1 and the lightning arrester F1 in real time.

[0047] Preferably, the temperature measuring unit 1 selects an infrared temperature measuring module.

[0048] Among them, the processing unit 2 obtains the fundamental wave component, harmonic component, and the state of the capacitor C1 through edge computing.

[0049] In edge computing, the server receives the collected capacitor temperature and voltage data, calculates through Fourier transform, compares with the temperature and voltage models in the existing database, formulates a suitable judgment scheme, obtains the fundamental wave component, harmonic component, and the state of the capacitor C1, and supplements and improves the existing database model.

[0050] Preferably, the communication unit 3 selects a wireless communication module.

[0051] Preferably, the energy storage unit 5 selects capacitor energy storage.

[0052] The power-taking module B includes a power-taking coil CT2, a conditioning unit 4, and an energy storage unit 5. The power-taking coil CT2 is arranged on the connection cable between the capacitor C1 and the lightning arrester F2 for taking energy. The power-taking coil CT2 is connected to the conditioning unit 4 through a low-voltage cable, and the conditioning unit 4 delivers the conditioned electric energy to the energy storage unit 5.

[0053] In the catenary neutral section transient overvoltage protection device based on edge computing of the present invention, the working principle of the power-taking module B is as follows:

[0054] The power-taking module B first uses a power-taking coil to obtain energy, rectifies it through a silicon stack, shunts a filter electrolytic capacitor across the silicon stack to improve the power quality, then steps down the voltage through a DC-DC module, and stores the stepped-down electrical energy in a capacitor and a storage battery after passing through a MOS transistor. The capacitor and the storage battery are used to supply power to the single-chip microcomputer and the data remote transmission module. The single-chip microcomputer monitors the voltages at both ends of the capacitor and the battery. When the voltage is lower than the preset value, it indicates that the voltage is low, and the power supply to the data remote transmission module is cut off. When the voltage reaches the preset value, the power supply to the data remote transmission module is restored.

[0055] The advantages of the power-taking module are as follows:

[0056] ① The single-chip microcomputer judges the magnitude of the voltage and controls the charging of the capacitor and the battery through the on-off of the MOS transistor.

[0057] ② A energy storage and discharge structure is proposed, which improves the power quality of the remote module and eliminates the module damage and abnormal data transmission caused by voltage fluctuations.

[0058] Please refer to Figure 2 , the working process of an on-phase-transition transient overvoltage protection device for catenary based on edge computing of the present invention is as follows:

[0059] When a phase-separation overvoltage occurs in the line, the hardware device suppresses and discharges the high voltage. At the same time, the measurement module monitors the working parameters of the lightning arrester F1 and the capacitor C1, obtains the states of the lightning arrester F1 and the capacitor C1 through edge computing, and the communication module then transmits data such as the working parameters and states to the cloud computing module for storage, generates a report, and then transmits it to the terminal for display.

[0060] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0061] Please refer to Figure 3 , an on-phase-transition overvoltage suppression device for articulated phase separation in electrified railways applied to electric phase separation mainly includes a self-powered module, a measurement module, a communication module, a cloud computing module, and a terminal.

[0062] The self-powered module is mainly composed of a power-taking CT and a super capacitor. When the primary side current of the circuit is between 0.86 A and 7 A, the CT can be used to take power, enabling the operating current of the device itself to supply energy to the full set of intelligent monitoring devices. There is no need to configure functional components such as solar panels and lithium batteries, reducing the system complexity and installation and maintenance costs.

[0063] The measurement module uses advanced sensors and edge computing technology to achieve real-time online monitoring and in-situ data analysis and calculation of parameters such as voltage, current, harmonics, and temperature rise during railway operation, saving communication bandwidth while ensuring measurement accuracy.

[0064] The communication module uses 5G and LoRa wireless Internet of Things communication technologies, as well as SaaS cloud deployment technology, to achieve convenient interaction between railway monitoring information, alarm information, staff, and existing equipment.

[0065] The cloud computing module uses artificial intelligence technology to achieve all-round and full-process intelligent processing of "big data accumulation - clustering analysis - self-learning - status evaluation and alarm" for railway operation monitoring.

[0066] In summary, the present invention, an over-phase transient over-voltage protection device for catenary based on edge computing, while completing over-voltage protection, realizes real-time monitoring of lightning arresters and capacitors. By measuring the current value and using edge computing combined with temperature measurement, the state of capacitor C1 is obtained. The over-voltage energy is consumed by a parallel connection of a resistor and an inductor, and at the same time, a capacitor is connected in series to suppress over-voltage, improving the protection reliability. The self-powered power supply and energy storage technology is adopted, and the operation data is sent wirelessly. It takes into account the accuracy and practicality of railway over-voltage protection applications, while ensuring operation and maintenance safety and improving work efficiency.

[0067] The above content is only to illustrate the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A transient overvoltage protection device for catenary phase transition based on edge computing, characterized in that It includes a lightning arrester F1. One end of the lightning arrester F1 is connected to the high-voltage busbar M, and the other end of the lightning arrester F1 is connected to the ground point G through a lightning arrester monitor J1. The lightning arrester F1 is used to absorb the transient overvoltage generated during phase change. The lightning arrester monitor J1 is used to monitor the full current and the number of operations of the lightning arrester F1. One end of a resistor R1 and an inductor L1 connected in parallel is connected between the lightning arrester F1 and the high-voltage busbar M, and the other ends of the resistor R1 and the inductor L1 are sequentially connected to the ground point G through a capacitor C1 and a lightning arrester F2; a processing and communication module A and a power-taking module B are arranged on the connection cable between the capacitor C1 and the lightning arrester F2. The processing and communication module A is respectively connected to the capacitor C1 and the lightning arrester F1 through a temperature measurement unit (1). The power-taking module B is connected to the processing and communication module A to provide electric energy. The processing and communication module A includes a measuring coil CT1. The measuring coil CT1 is arranged on the connection cable between the capacitor C1 and the lightning arrester F2 to measure current. The measuring coil CT1 is connected to a processing unit (2). When a phase-separation overvoltage occurs in the line, the overvoltage protection device suppresses and discharges the high voltage. At the same time, the processing unit (2) obtains the operating states of the capacitor C1 and the lightning arrester F1 through real-time measurement of the current and temperature of the capacitor C1 and the temperature of the lightning arrester F1 and combining edge computing. Two ends of the lightning arrester F2 are connected in parallel with a resistor R2 and a lightning arrester F3 connected in series with each other. A return point G1 is connected between the resistor R2 and the lightning arrester F3 to further limit the railway phase-separation overvoltage; The power-taking module B includes a power-taking coil CT2. The power-taking coil CT2 is arranged on the connection cable between the capacitor C1 and the lightning arrester F2 to take power. The power-taking coil CT2 is connected to an energy storage unit (5) through a low-voltage cable via a conditioning unit (4); The temperature measurement unit (1) monitors the temperatures of the capacitor C1 and the lightning arrester F1 through infrared temperature measurement and transmits the temperature information to the processing unit (2). The temperature measurement unit (1) is an infrared temperature measurement module for real-time monitoring of the temperatures of the capacitor C1 and the lightning arrester F1.

2. The catenary neutral section transient overvoltage protection device based on edge computing according to claim 1, characterized in that, The processing unit (2) is connected to a communication unit (3).

3. The over-phase transient overvoltage protection device for catenary based on edge computing according to claim 2, characterized in that, The processing unit (2) and the communication unit (3) are respectively connected to the energy storage unit (5) of the power-taking module B.

4. The over-phase transient overvoltage protection device for catenary based on edge computing according to claim 1, characterized in that The energy storage unit (5) is capacitor energy storage.

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