Lightning protection safety system

Abstract

The invention provides a lightning protection safety system, and belongs to the technical field of safety barriers. The lightning protection safety system comprises a bottom plate, a lightning protection safety barrier and a power supply. According to the invention, an existing technical scheme of accessing the field signal to the control equipment is optimized, and the field signal sent by the field equipment is accessed to the control equipment without passing through a surge protection device, a knife switch and an isolation type safety barrier; field signals of the field equipment are transmitted to the control equipment through the lightning protection safety device and the bottom plate in sequence, so that the space of the cabinet body and the cable cost are saved. And meanwhile, the functions of lightning protection alarm, signal alarm and signal alarm are added. The signal chain protection instrument has the characteristics of high reliability of intrinsic safety / lightning protection, intelligence of intelligent bus diagnosis and the like, so as to meet the requirement of high-end industrial customers on integration of the signal chain protection instrument.

Description

Technical Field

[0001] The present invention relates to the technical field of safety barriers, and particularly to a lightning protection safety system. Background Art

[0002] Industry 4.0 and smart factories have put forward new requirements for the reliability, integration and intelligence of instruments. The traditional discrete signal chain protection instrument method can no longer meet the above requirements. Traditional isolated safety barriers have been partially replaced by intrinsically safe IO, APL instruments, etc. Lightning protection is a necessity in modern industrial sites and is increasingly valued by customers. The future direction is a lightning protection safety barrier with lightning protection function. See Figure 3 , in the prior art, the field signals sent by field devices need to pass through a surge protector cabinet and an isolated safety barrier in sequence before being connected to the control device, which requires a large cabinet space and high cable costs. In the existing isolated safety barriers, only LED fault indication is provided, and generally, line fault alarm and lightning protection alarm uploading functions are not available in surge protectors and isolated safety barriers, resulting in low safety. Summary of the Invention

[0003] The object of the present invention is to propose a lightning protection safety system for the deficiencies of the above-mentioned prior art.

[0004] The present invention proposes a lightning protection safety system, including a bottom plate, a lightning protection safety barrier connected to the bottom plate, and a power supply for supplying power to the bottom plate and the lightning protection safety barrier respectively; the lightning protection safety barrier is connected to field devices, and the bottom plate is connected to a control device; the lightning protection safety barrier includes a signal module and a lightning protection module; the lightning protection module receives the field signal of the field device and sends the field signal to the signal module, the signal module is used to send the field signal to the bottom plate, and the bottom plate is used to send the field signal to the control device; the bottom plate is used to receive the control signal sent by the control device and send the control signal to the signal module, the signal module is used to send the control signal to the lightning protection module, and the lightning protection module is used to send the control signal to the field device; when the surge meets the first preset condition, the lightning protection module sends a lightning protection alarm signal to the bottom plate, and the bottom plate sends the lightning protection alarm signal to the control device.

[0005] Further, the signal module includes a hazardous area unit, a transmission unit, a safe area unit, and a first power supply unit, and the bottom plate includes a signal output port; the hazardous area unit is used to receive the field signal transmitted by the lightning protection module and transmit the field signal to the signal output port through the transmission unit and the safe area unit in sequence, and the signal output port is used to transmit the field signal to the control device; the signal output port is used to receive the control signal transmitted by the control device and transmit the control signal to the hazardous area unit through the safe area unit and the transmission unit in sequence, and the hazardous area unit is used to transmit the control signal to the lightning protection module.

[0006] Further, the hazardous area unit includes a hazardous area protection circuit and a first signal processing circuit, the transmission unit includes a signal transmission transformer, the safe area unit includes a second signal processing circuit and a safe area protection circuit, and the hazardous area protection circuit is configured to receive the field signal transmitted by the lightning protection module and transmit the field signal to the signal output port through the first signal processing circuit, the signal transmission transformer, the second signal processing circuit, and the safe area protection circuit in sequence; the safe area protection circuit is configured to receive the control signal transmitted by the signal output port and transmit the control signal to the lightning protection module through the second signal processing circuit, the signal transmission transformer, the first signal processing circuit, and the hazardous area protection circuit in sequence.

[0007] Further, the base plate further includes a lightning protection alarm processing circuit, and the lightning protection module includes a first-stage protection circuit, a second-stage protection circuit, a failure alarm circuit, and a coupling circuit with an input end and an output end respectively connected to the first-stage protection circuit and the second-stage protection circuit; the failure alarm circuit includes a thermal fuse; the first-stage protection circuit is configured to convert the surge into a first preset voltage and transmit the first preset voltage to the second-stage protection circuit through the coupling circuit, the second-stage protection circuit fails when the first preset voltage exceeds a first preset value and releases heat to break the thermal fuse, the failure alarm circuit is configured to transmit a lightning protection alarm signal to the lightning protection alarm processing circuit when the thermal fuse is broken, and the lightning protection alarm processing circuit is configured to transmit the lightning protection alarm signal to the control device.

[0008] Further, the signal module further includes a fault detection circuit, the base plate further includes a signal alarm output port, the fault detection circuit is configured to send a signal anomaly alarm signal to the signal alarm output port when the real-time signal meets a second preset condition, and the signal alarm output port is configured to transmit the signal anomaly alarm signal to the control device.

[0009] Further, the base plate further includes a power supply diagnosis circuit and a second power supply unit for receiving the electric energy transmitted by the power supply, and the power supply diagnosis circuit is configured to obtain the real-time power supply state of the second power supply unit and send a power supply alarm signal to the control device when the real-time power supply state meets a third preset condition.

[0010] Further, the first power supply unit includes a power supply conditioning circuit, a power supply driving circuit, and a power supply transformer. The power supply conditioning circuit is configured to receive the electric energy transmitted by the power supply and condition the electric energy to obtain first-processed electric energy, and the power supply driving circuit controls the power supply transformer to respectively transmit the first-processed electric energy to the safe area unit and the hazardous area unit.

[0011] Further, the second power supply unit includes a monitoring relay, and the power supply diagnosis circuit uses the output signal of the monitoring relay as the real-time power supply state, and the power supply diagnosis circuit determines that the real-time power supply state meets the third preset condition when the output signal of the monitoring relay is an open-circuit signal.

[0012] Further, the bottom plate further includes an alarm lamp, and the power supply diagnosis circuit is used to control the alarm lamp to turn on a green light when the monitoring relay outputs a closed signal and control the alarm lamp to turn on a red light when the monitoring relay outputs an open-circuit signal.

[0013] Further, the coupling circuit includes a coupling inductor, the first-stage protection circuit includes a gas discharge tube, the second-stage protection circuit includes a transient suppression diode, and the transient suppression diode fails when the first preset voltage exceeds the first preset value and releases heat to cut off the temperature fuse.

[0014] A lightning protection safety system of the present invention has the following beneficial effects: In this application, the technical solution of the existing on-site signal access control device is optimized. In this application, the on-site signal sent by the on-site device does not need to pass through a surge protector, a knife switch, and an isolated safety barrier before accessing the control device. In this application, the on-site signal of the on-site device is transmitted to the control device through lightning protection safety and the bottom plate in sequence, saving cabinet space and cable costs. At the same time, lightning protection alarms, signal alarms, and signal alarm functions are added in this application. It has the characteristics of intrinsic safety / high reliability of lightning protection, intelligence of intelligent bus diagnosis, etc., to meet the integrated needs of high-end industrial customers for signal chain protection instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings incorporated into the specification and constituting a part of the specification illustrate embodiments of the present invention and, together with the description, are used to explain the principles of the present invention. In these drawings, like reference numerals are used to represent like elements. The drawings in the following description are some embodiments of the present invention, not all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a first principle block diagram of a lightning protection safety system in an embodiment of the present invention; Figure 2 It is a second principle block diagram of a lightning protection safety system in an embodiment of the present invention Figure 3 It is a flowchart when an isolated safety barrier in the prior art transmits an on-site signal to a control device; Figure 4 It is a flowchart when the lightning protection safety system in an embodiment of the present invention transmits the on-site signal sent by an on-site device to a control device; Figure 5 The flowchart for the lightning protection safety barrier and the base plate to transmit the on-site signal in sequence in the embodiments of the present invention; Figure 6 The schematic diagram of the discharge capacity and response speed of the non-linear components in a lightning protection safety system according to an embodiment of the present invention; Figure 7 The circuit diagram of the signal module in a lightning protection safety system according to an embodiment of the present invention; Figure 8 The principle design diagram of the lightning protection alarm in a lightning protection safety system according to an embodiment of the present invention; Figure 9 In an embodiment of the present invention, a lightning protection safety system Figure 1 Partial enlarged schematic diagram; Figure 10 In an embodiment of the present invention, a lightning protection safety system Figure 2 Partial enlarged schematic diagram. Specific embodiments

[0017] 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. 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. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other arbitrarily.

[0018] Please refer to Figures 1-10 A lightning protection safety system according to an embodiment of the present invention includes a base plate, a lightning protection safety barrier connected to the base plate, and a power supply for supplying power to the base plate and the lightning protection safety barrier respectively; the lightning protection safety barrier is connected to on-site equipment, and the base plate is connected to control equipment; the lightning protection safety barrier includes a signal module and a lightning protection module; the lightning protection module receives the on-site signal of the on-site equipment and sends the on-site signal to the signal module, the signal module is used to send the on-site signal to the base plate, and the base plate is used to send the on-site signal to the control equipment; the base plate is used to receive the control signal sent by the control equipment and send the control signal to the signal module, the signal module is used to send the control signal to the lightning protection module, and the lightning protection module is used to send the control signal to the on-site equipment; when the lightning surge meets the first preset condition, the lightning protection module sends a lightning protection alarm signal to the base plate, and the base plate sends the lightning protection alarm signal to the control equipment.

[0019] Here, refer to Figure 4, when using this application, the on-site signals of on-site devices only need to pass through the lightning protection and safety system to access the control device. In this application, the on-site signals sent by on-site devices can be transmitted to the control device, and the control signals sent by the control device can also be transmitted to on-site devices. Compared with the prior art, surge protectors and knife switches are reduced, saving cabinet space and cable costs. See Figure 5 , this application has the function of uploading line alarms, such as: signal alarm function, lightning protection alarm function, power supply alarm function (including LED fault indication).

[0020] Specifically, intrinsically safe type: The intrinsically safe type is an explosion-proof type of electrical equipment that limits the energy of electric sparks or thermal effects that may be generated by the internal parts of the equipment and the connecting wires exposed to a potentially explosive environment to a level that cannot cause ignition. This application has the characteristics of high reliability of intrinsic safety / lightning protection, high integration of saving cabinets / cables, and intelligence of intelligent bus diagnosis, etc., to meet the integrated needs of high-end industrial customers for signal chain protection instruments. The functions of this application include: signal lightning protection + intrinsic safety explosion protection, online hot plugging of lightning protection modules, intelligent line fault monitoring / alarm, and integrated bottom plate installation. The bottom plate and lightning protection safety barrier in this application can be integrally installed, which can save more than 30% - 50% of the cabinet cost and 60 - 70% of the component cost.

[0021] The signal module may include a hazardous area unit, a transmission unit, a safe area unit, and a first power supply unit. The bottom plate includes a signal output port; the hazardous area unit is used to receive the on-site signal transmitted by the lightning protection module and transmit the on-site signal to the signal output port through the transmission unit and the safe area unit in sequence. The signal output port is used to transmit the on-site signal to the control device; the signal output port is used to receive the control signal transmitted by the control device and transmit the control signal to the hazardous area unit through the safe area unit and the transmission unit in sequence. The hazardous area unit is used to transmit the control signal to the lightning protection module.

[0022] Specifically, the hazardous area unit receives the on-site signal transmitted by the lightning protection module, and the signal at this time has not been processed; the safe area receives the on-site signal transmitted by the transmission unit, and the signal at this time has been processed by the hazardous area unit and the transmission unit. The hazardous area unit is used to receive the on-site signal sent by the lightning protection module and send it to the safe area unit through the transmission unit. The safe area unit is used to send the on-site signal to the signal output port. The signal output port is used to send the on-site signal to the control device; the signal output port is used to receive the control signal sent by the control device and send the control signal to the safe area unit. The safe area unit is used to send the control signal to the hazardous area unit through the transmission unit. The hazardous area unit is used to send the control signal to the lightning protection module.

[0023] The hazardous area unit may include a hazardous area protection circuit and a first signal processing circuit. The transmission unit includes a signal transmission transformer. The safe area unit includes a second signal processing circuit and a safe area protection circuit. The hazardous area protection circuit is used to receive the field signal transmitted by the lightning protection module and transmit the field signal to the signal output port through the first signal processing circuit, the signal transmission transformer, the second signal processing circuit, and the safe area protection circuit in sequence. The safe area protection circuit is used to receive the control signal transmitted by the signal output port and transmit the control signal to the lightning protection module through the second signal processing circuit, the signal transmission transformer, the first signal processing circuit, and the hazardous area protection circuit in sequence.

[0024] Specifically, the hazardous area protection circuit is used to receive the field signal sent by the lightning protection module and send the field signal to the signal transmission transformer through the first signal processing circuit. The second signal processing circuit is used to receive the field signal sent by the signal transmission transformer and send the field signal to the signal output port through the safe area protection circuit. The safe area protection circuit is used to receive the control signal sent by the signal output port and send the control signal to the signal transmission transformer through the second signal processing circuit. The first signal processing circuit is used to receive the control signal sent by the signal transmission transformer and send the control signal to the lightning protection module through the hazardous area protection circuit.

[0025] Specifically, the hazardous area unit may further include a hazardous area current compensation circuit, and the safe area unit may further include a safe area current compensation circuit. The transmission unit may include a HART signal transmission circuit, an analog signal transmission circuit, a current limiting circuit, a voltage and current limiting circuit, a wire break detection circuit, and a wire break alarm circuit.

[0026] Specifically, when used in conjunction with the system cabinet, the alarm application solution of this application: Intelligent alarm solution: Locate the specific faulty module. The faulty module refers to the lightning protection safety barrier module that has a fault condition and outputs a fault signal. Locate through the alarm signal provided and uploaded by the module. The intelligent backplane sends the alarm information to the DCS communication board or gateway through the standard ModbusRTU protocol. Among them, the communication board can send the alarm information to the DCS system and the VF monitoring software. The gateway can also send the alarm information to the VF monitoring software through the industrial switch, and at the same time can go to the cloud through MQTT and finally be transmitted to mobile phones, network PCs or SUPOS; Bus switch alarm: Locate the backplane where the faulty module is located. Through the method of the digital input / output (DI) bus, it can be the DI alarm of a single backplane or the series-parallel connection of the DI alarms of multiple backplanes, and connect to the DI output channel of the DCS. When alarming, locate the alarm backplane, and then judge the alarm module through the status light on the module. Locate through the alarm signal provided and uploaded by the module. There are special alarm indicator lights on the appearance of the module to indicate.

[0027] The bottom plate may further include a lightning protection alarm processing circuit. The lightning protection module includes a first-stage protection circuit, a second-stage protection circuit, a failure alarm circuit, and a coupling circuit with its input end and output end respectively connected to the first-stage protection circuit and the second-stage protection circuit; the failure alarm circuit includes a thermal fuse; the first-stage protection circuit is used to convert a lightning surge into a first preset voltage and transmit the first preset voltage to the second-stage protection circuit through the coupling circuit, the second-stage protection circuit fails when the first preset voltage exceeds a first preset value and releases heat to break the thermal fuse, the failure alarm circuit is used to transmit a lightning protection alarm signal to the lightning protection alarm processing circuit when the thermal fuse is broken, and the lightning protection alarm processing circuit is used to transmit the lightning protection alarm signal to a control device.

[0028] Specifically, the first-stage protection circuit includes a GDT (gas discharge tube), the second-stage protection circuit includes a TVS (transient voltage suppressor diode), the failure alarm circuit can be a TVS failure indication alarm circuit. The lightning protection module adopts a two-stage protection circuit of GDT and TVS, which can realize the function of protecting the circuit of the surge protector. At the same time, the lightning protection module also includes a TVS failure indication alarm circuit, which can send a lightning protection alarm signal to the bottom plate. A coupling inductor is used in the middle to realize the energy coordination between the two stages of GDT and TVS in the lightning protection module. In the prior art, when an isolated safety barrier is used, a surge protector with a matching model needs to be configured separately. However, the lightning protection module in this application is directly integrated in the lightning protection safety barrier and does not require additional components, which is convenient for use. At the same time, the existing surge protectors and isolated safety barriers do not have a lightning protection alarm function. In this application, the failure alarm circuit transmits a lightning protection alarm signal to the lightning protection alarm processing circuit when the thermal fuse is broken, and the lightning protection alarm processing circuit is used to transmit the lightning protection alarm signal to a control device, that is, the lightning protection safety system in this application can realize the lightning protection alarm function.

[0029] Specifically, the non-linear components used inside the lightning protection module are TVS (transient voltage suppressor diode) and gas discharge tube (GDT). The relationship between the discharge capacity and response speed of its main non-linear components is as Figure 6As shown. When a lightning surge occurs (the rising speed is generally in the microsecond level), it can conduct in an extremely short time (generally in the nanosecond level), discharge the current to the ground, limit the voltage to a safe level, and play a role in protecting the equipment. The so-called energy coordination means that for multi-stage lightning protection modules or protection components with different discharge capacities, when used together, the lightning current must be reasonably distributed to ensure that the lightning protection module or component with a smaller discharge capacity will not be damaged. The first-stage protection circuit GDT of the lightning protection module has a large discharge capacity and a high residual voltage, while the second-stage protection circuit TVS has a small discharge capacity and a low residual voltage. In order to achieve a better protection effect (large discharge capacity and low residual voltage), two-stage protection circuits are used simultaneously. However, in actual situations, the lightning current does not necessarily flow as expected. Most of it is discharged through the GDT, and a small part is discharged through the TVS. If energy coordination cannot be achieved, the TVS will be damaged due to excessive sharing of the lightning current. If the energy cannot be coordinated, the TVS is particularly prone to damage, which is also the reason for setting the TVS tube failure alarm.

[0030] Specifically, the present application selects the gas discharge tube GDT of BENCENT, with the model BE091MTW-2. Its maximum current discharge capacity is: insulation resistance ≥ 1 GΩ @ 50V, 1-time pulse discharge current 20000A @ 8 / 20 μs, ±5-time pulse discharge current 10000A @ 8 / 20 μs. It is sufficient to meet the design parameter requirements.

[0031] Specifically, the TVS failure alarm logic is as follows: After the surge passes through the first-stage protection circuit of the lightning protection module, the residual voltage is still as high as 600V - 700V. This part of the energy passes through the coupling inductor and then flows through the second-stage protection circuit (TVS protection circuit) of the lightning protection module. Such a large amount of residual surge energy is also likely to damage the TVS tube (with a picosecond response time), which is the reason for setting the TVS tube failure alarm. The failure mode of the TVS is short-term overheating and burnout, resulting in a short circuit of the TVS. Therefore, we designed an alarm indication circuit for this characteristic. Alarm indication circuit: When the TVS tube fails, it will release a large amount of heat, which will cause the temperature fuse close to the TVS tube to open. After the fuse opens, the open alarm signal will be transmitted to the bottom plate. The gas discharge tube GDT constitutes the first-stage protection circuit of the lightning protection module. When a surge enters, it should first pass through the GDT for energy discharge. Therefore, this part of the circuit should be placed close to the signal input terminal first. Its characteristic is that it has a strong current discharge capacity (up to 20000A@8 / 20μs), but its response time is the slowest among the three devices, generally above 100ns, and the residual voltage is high. After each transient voltage action, its performance will decline. Four diodes D1, D2, D3, and D4 form a rectifier bridge for the TVS tube to discharge. The TVS tube and the rectifier bridge stack together constitute the second-stage protection circuit. After the surge passes through the first-stage protection circuit of the lightning protection module, most of the energy has been discharged to the ground by the gas discharge tube GDT, but the residual voltage is still as high as 600V - 700V. This part of the energy passes through the coupling inductor and then flows through the second-stage protection circuit (TVS protection circuit) of the lightning protection module. Among them, the TVS tube and D1, D2, D3, and D4 are responsible for discharging the residual surge voltage of channels 1 and 2, and finally the residual voltage between lines can be achieved within 60V.

[0032] Specifically, see Figure 7 , Signal module design: The signal module is generally divided into three parts: power supply area, safety area, and hazardous area, with three-terminal isolation. To prevent the energy signal in the control room from affecting the hazardous site, the hazardous site is the on-site equipment. Therefore, according to the requirements of safety regulations for explosion protection, the signals between the control room and the hazardous site need to be electrically isolated. Here, the electrical isolation is achieved by the lightning protection safety barrier product to isolate the control room side (system side) and the field side (on-site equipment); to prevent the power conditioning circuit from affecting the control room signal and the hazardous site signal, it is necessary to electrically isolate the power conditioning circuit from the control signal and the field signal.

[0033] Specifically, for the signal transmission part: According to different signal processing functions, the signal transmission part of the signal module can be divided into: digital input / output signal module, analog signal module, temperature transmitter signal module, etc. Since different signal modules can be adapted to different application scenarios.

[0034] The signal module may further include a fault detection circuit, and the base plate further includes a signal alarm output port. The fault detection circuit is used to send a signal abnormality alarm signal to the signal alarm output port when the real-time signal meets the second preset condition, and the signal alarm output port is used to send the signal abnormality alarm signal to the control device.

[0035] The base plate may further include a power supply diagnosis circuit and a second power supply unit for receiving electric energy delivered by the power supply. The power supply diagnosis circuit is used to obtain the real-time power supply state of the second power supply unit and send a power supply alarm signal to the control device when the real-time power supply state meets the third preset condition.

[0036] The first power supply unit may include a power conditioning circuit, a power driving circuit, and a power transformer. The power conditioning circuit is used to receive the electric energy delivered by the power supply and condition the electric energy to obtain first-processed electric energy. The power driving circuit controls the power transformer to deliver the first-processed electric energy to the safe area unit and the hazardous area unit respectively.

[0037] The second power supply unit may include a monitoring relay. The power supply diagnosis circuit is used to use the output signal of the monitoring relay as the real-time power supply state. The power supply diagnosis circuit determines that the real-time power supply state meets the third preset condition when the output signal of the monitoring relay is an open-circuit signal.

[0038] The base plate may further include an alarm lamp. The power supply diagnosis circuit is used to control the alarm lamp to turn on a green light when the monitoring relay outputs a closed signal and control the alarm lamp to turn on a red light when the monitoring relay outputs an open-circuit signal.

[0039] Specifically, for the power supply part: The power supply area circuits of this lightning protection grid series all adopt the same design, which are a BUCK conditioning circuit and an isolation transformer driving circuit respectively. That is, the first power supply unit may include a BUCK circuit and an isolation power supply circuit. Design description: After the input power supply is conditioned by the BUCK conditioning circuit, the H-bridge transformer driving chip MAX13256 is used to generate a switching signal with a frequency of 440 kHz, so as to realize the full-bridge drive of the transformer.

[0040] Specifically, for the base plate module design: This power supply adopts 24V redundant power supply, and monitors the power supply through the relay state. When the power supply is normal, the relay outputs a closed signal (that is, defined as the normal power supply state), and the corresponding normal channel LED turns on a green light; when a power supply fault occurs, the relay outputs an open-circuit signal (that is, defined as the abnormal power supply state, such as: fuse blown), and the corresponding abnormal channel LED turns on a red light.

[0041] The coupling circuit may include a coupling inductor. The first-stage protection circuit includes a gas discharge tube. The second-stage protection circuit includes a transient suppression diode. The transient suppression diode fails when the first preset voltage exceeds the first preset value and releases heat to cut off the temperature fuse.

[0042] There can be multiple lightning protection safety barriers, and the multiple lightning protection safety barriers are respectively connected to a base plate.

[0043] Specifically, refer to Figure 8 , for the signal alarm of the signal module, the switching contact signal of the signal alarm is transmitted to the alarm signal interface of the base plate through a connecting piece (J25). Normal signal flow of the lightning protection module: The signal flow is 24V - R1 - V+ - F2 - LED1 - GND - R33 - GNDERR. When the lightning protection module is normal, the circuits of the fuse and LED will bypass the circuits of R2 and MP1, so that MP1 outputs an open circuit signal (the lightning protection module does not output an alarm signal). Failure signal flow of the lightning protection module: The signal flow is 24V - R1 - R2 - MP1 - V- - GND - R33 - GNDERR. When the lightning protection module fails, the F2 fuse blows and the R2 and MP1 circuits are normally driven, so that MP1 outputs a closed signal (the lightning protection module outputs an alarm signal). The MP1 circuit is a lightning protection alarm circuit, and MP1 is the key to realizing the optical MOS solid-state relay scheme of the alarm output: The resistance values of R1 and R2 need to be adjusted, and the adjustment scheme needs to meet that when the fuse F2 is normal, MP1 needs to be bypassed; when the fuse F2 is blown, the current of the MP1 circuit needs to be at least 3mA to ensure its full conduction.

[0044] Specifically, 1. Bus switch alarm: The failure alarm signals of 16 lightning protection barriers are first uniformly processed by the circuit on the base plate and then transmitted to the subsequent stage through a special cable (the subsequent stage refers to the system side or can also be the tool used by Yongheng for its own detection), saving wiring costs and a large amount of system DI resources (for conventional base plate type safety barrier alarm signals, they are usually individually connected to the system DI detection circuit through wires, with complex wiring, high costs, and a large number of DI points required).

[0045] 2. Intelligent communication alarm: The alarm signals are further integrated and processed through an intelligent gateway, and the outputs of several intelligent base plates are integrated into one digital channel, further saving wiring costs and a large amount of system DI resources (based on the system level, one digital channel can monitor thousands to tens of thousands of lightning protection barriers).

[0046] 3. Intelligent bus alarm base plate installation: It can diagnose the faults of the module and connect the alarm signals to the system. If there is an alarm, it means there is a fault, such as abnormal phenomena like damage to lightning protection devices, short / open circuit of input / output, and range overrun. On the basis of the alarm indication on the module body, it is uploaded to the system in the form of a bus through the intelligent base plate by means of fault code communication, etc., and can provide intelligent operations such as on-line diagnostic alarm, fault recording, and troubleshooting tips for users.

[0047] 4. Surge module design scheme and surge protection module failure detection and alarm function: For the lightning protection tube in the lightning protection module that is prone to failure, a disconnection alarm circuit with a thermal fuse is designed. When a failure alarm occurs, the internal low-temperature fuse can timely disconnect and upload a surge alarm signal for the failed surge module, thus greatly improving the reliability and maintainability of the system.

[0048] 5. When the signal module transmits signals, if the signal transmission function fails or the signal transmission is abnormal (such as abnormal situations like open circuit or short circuit on the field side), it will output a switch quantity closed alarm signal to the backplane module, and then transmit this alarm signal to the system through the backplane.

[0049] 6. The lightning protection module can be hot-swapped and replaced online, and the signal accuracy is not affected before and after replacement.

[0050] Specifically, 1. The backplane-mounted lightning protection safety system is suitable for large-scale intensive installation, simplifies the wiring on the system side, saves wiring costs, and improves reliability, economy, and maintainability; it fills the industry gap.

[0051] 2. The lightning protection safety system with alarm and alarm indication can upload the alarm signal. It greatly improves the intelligent level of the product and significantly enhances the reliability and maintainability of the system.

[0052] 3. It has high reliability with intrinsic safety / lightning protection.

[0053] 4. The backplane-mounted installation and integrated design can greatly save the cabinet space, and the high integration degree of the cables can simplify the cable wiring and save cable costs.

[0054] The content described above can be implemented alone or in various combinations, and these variant ways are all within the protection scope of the present invention.

[0055] It should be noted that in the description of this application, the terms "upper end", "lower end", and "bottom end" indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. These are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lightning protection safety system, characterized in that: It includes a bottom plate, a lightning protection safety barrier connected to the bottom plate, and a power supply for supplying power to the bottom plate and the lightning protection safety barrier respectively; the lightning protection safety barrier is connected to field devices, and the bottom plate is connected to control devices; the lightning protection safety barrier includes a signal module and a lightning protection module; the lightning protection module receives the field signal of the field device and transmits the field signal to the signal module, the signal module is used to transmit the field signal to the bottom plate, and the bottom plate is used to transmit the field signal to the control device; the bottom plate is used to receive the control signal transmitted by the control device and transmit the control signal to the signal module, the signal module is used to transmit the control signal to the lightning protection module, and the lightning protection module is used to transmit the control signal to the field device; when the lightning surge meets the first preset condition, the lightning protection module transmits a lightning protection alarm signal to the bottom plate, and the bottom plate transmits the lightning protection alarm signal to the control device.

2. A lightning protection safety system according to claim 1, characterized in that: The signal module includes a hazardous area unit, a transmission unit, a safe area unit, and a first power supply unit, and the bottom plate includes a signal output port; the hazardous area unit is used to receive the field signal transmitted by the lightning protection module and transmit the field signal to the signal output port through the transmission unit and the safe area unit in sequence, and the signal output port is used to transmit the field signal to the control device; the signal output port is used to receive the control signal transmitted by the control device and transmit the control signal to the hazardous area unit through the safe area unit and the transmission unit in sequence, and the hazardous area unit is used to transmit the control signal to the lightning protection module.

3. A lightning protection safety system according to claim 2, characterized in that: The hazardous area unit includes a hazardous area protection circuit and a first signal processing circuit, the transmission unit includes a signal transmission transformer, the safe area unit includes a second signal processing circuit and a safe area protection circuit, and the hazardous area protection circuit is used to receive the field signal transmitted by the lightning protection module and transmit the field signal to the signal output port through the first signal processing circuit, the signal transmission transformer, the second signal processing circuit, and the safe area protection circuit in sequence; the safe area protection circuit is used to receive the control signal transmitted by the signal output port and transmit the control signal to the lightning protection module through the second signal processing circuit, the signal transmission transformer, the first signal processing circuit, and the hazardous area protection circuit in sequence.

4. A lightning protection safety system according to claim 1 or 2 or 3, characterized in that: The bottom plate further includes a lightning protection alarm processing circuit, and the lightning protection module includes a first-stage protection circuit, a second-stage protection circuit, a failure alarm circuit, and a coupling circuit with the input end and the output end respectively connected to the first-stage protection circuit and the second-stage protection circuit; the failure alarm circuit includes a thermal fuse; the first-stage protection circuit is used to convert the lightning surge into a first preset voltage and transmit the first preset voltage to the second-stage protection circuit through the coupling circuit, the second-stage protection circuit fails when the first preset voltage exceeds the first preset value and releases heat to break the thermal fuse, and the failure alarm circuit is used to transmit the lightning protection alarm signal to the lightning protection alarm processing circuit when the thermal fuse is broken, and the lightning protection alarm processing circuit is used to transmit the lightning protection alarm signal to the control device.

5. A lightning protection safety system according to claim 1 or 2 or 3, characterized in that: The signal module further includes a fault detection circuit, the base plate further includes a signal alarm output port, the fault detection circuit is used to transmit a signal abnormal alarm signal to the signal alarm output port when the real-time signal meets the second preset condition, and the signal alarm output port is used to transmit the signal abnormal alarm signal to the control device.

6. A lightning protection safety system according to claim 1 or 2 or 3, characterized in that: The base plate further includes a power supply diagnosis circuit and a second power supply unit for receiving electric energy delivered by a power supply, the power supply diagnosis circuit is used to obtain the real-time power supply state of the second power supply unit and transmit a power supply alarm signal to the control device when the real-time power supply state meets the third preset condition.

7. A lightning protection safety system according to claim 2 or 3, characterized in that: The first power supply unit includes a power conditioning circuit, a power driving circuit, and a power transformer. The power conditioning circuit is used to receive the electric energy delivered by the power supply and condition the electric energy to obtain first processed electric energy. The power driving circuit controls the power transformer to respectively deliver the first processed electric energy to the safe area unit and the hazardous area unit.

8. A lightning protection safety system according to claim 6, characterized in that: The second power supply unit includes a monitoring relay. The power supply diagnosis circuit uses the output signal of the monitoring relay as the real-time power supply state, and the power supply diagnosis circuit determines that the real-time power supply state meets the third preset condition when the output signal of the monitoring relay is an open circuit signal.

9. A lightning protection safety system according to claim 8, characterized in that: The base plate further includes an alarm lamp. The power supply diagnosis circuit is used to control the alarm lamp to turn on a green light when the monitoring relay outputs a closed signal and control the alarm lamp to turn on a red light when the monitoring relay outputs an open circuit signal.

10. A lightning protection safety system as described in claim 4, characterized in that: The coupling circuit includes a coupling inductor, the first-stage protection circuit includes a gas discharge tube, the second-stage protection circuit includes a transient suppression diode, and the transient suppression diode fails and releases heat to break the temperature fuse when the first preset voltage exceeds the first preset value.

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