Phase-to-ground short circuit monitoring and protecting device

Abstract

The utility model provides a phase-to-ground short circuit monitoring and protecting device, which relates to the technical field of monitoring and protecting devices and comprises a signal conditioning module, a central processing module and a tripping protection module. The signal conditioning module is connected with the central processing module and is used for filtering, converting and amplifying an input signal; the central processing module is connected with the tripping protection module, and is used for executing instructions, processing data and controlling the operation of the system, monitoring and managing the operation state of the system in real time, and responding when an abnormity or a fault is detected; and the tripping protection module is used for detecting abnormal conditions in an electrical system and cutting off a circuit when overload, short circuit or other electrical faults occur so as to guarantee safe operation of equipment and the system. The beneficial effects of the utility model are that multiple nodes can be effectively monitored at the same time, response can be made in time, and the possibility of comprehensive power loss caused by electric leakage or overcurrent of individual nodes in a power control system is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of monitoring protection devices, in particular to a phase-to-ground short circuit monitoring protection device. Background Art

[0002] In the control field of power grids, etc., the equipment has been running for a long time or large equipment has been running under long-term heavy load, causing the circuit to heat up and age, or the uncertainty of the equipment causes system leakage or current imbalance, thus causing the latter stage to trip, and in severe cases, the PC will trip across the level and cause large-scale power outages. To solve this series of problems, most of the products on the market have only one monitoring node and a single structure and function. In order to protect normal equipment from working normally and not causing large-scale power outages, and to find out the problem according to the monitoring point, the utility model combines the power control system to design a monitoring device, that is, a phase-to-ground short-circuit protection device that can simultaneously monitor multiple channels online in real time. Utility Model Content

[0003] The purpose of the utility model is to provide a phase-to-ground short circuit monitoring and protection device to improve the above problems. In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0004] In a first aspect, the present application provides a ground short circuit monitoring protection device, including a signal conditioning module, a central processing module and a tripping protection module;

[0005] The signal conditioning module is connected to the central processing module and is used to filter, convert and amplify the input signal;

[0006] The central processing module is connected to the tripping protection module and is used to execute instructions, process data and control the operation of the system, monitor and manage the operating status of the system in real time, and respond when an abnormality or fault is detected, triggering a tripping protection system safety;

[0007] The trip protection module is used to detect abnormal conditions in the electrical system and cut off the circuit when an overload, short circuit or other electrical fault occurs, thereby ensuring the safe operation of the equipment and system.

[0008] Preferably, the signal conditioning module comprises a signal input module, a CT isolation module, a signal amplification module and a signal conditioning module connected in sequence;

[0009] The output end of the signal input module is connected to the input end of the CT isolation module, and the signal input module is used to receive and process input signals, wherein the input signals include current signals;

[0010] The output end of the CT isolation module is connected to the input end of the signal amplification module, and the CT isolation module is used to isolate the electrical connection between different circuits and the signal isolation between the front and rear stages;

[0011] The output end of the signal amplification module is connected to the input end of the signal conditioning module, and the signal amplification module is used to amplify the signal to reach a level suitable for subsequent processing or transmission;

[0012] The output end of the signal conditioning module is connected to the input end of the central processing module, and the signal conditioning module is used to filter, convert and amplify the input signal.

[0013] Preferably, the signal input module, the CT isolation module, the signal amplification module and the signal conditioning module connected in sequence are set as a first path, and at least 12 signal conditioning paths are formed for real-time monitoring.

[0014] Preferably, the central processing module includes an analog-to-digital conversion module, a power supply module and a central processing unit;

[0015] Wherein, the central processing unit comprises a first input port and a second input port, and the central processing unit is used to execute instructions, process data and control the operation of the system;

[0016] The output end of the analog-to-digital conversion module is connected to the first input port of the central processing unit, and the analog-to-digital conversion module is used to convert the analog signal into a digital signal and provide a basis for processing and analysis by the central processing unit;

[0017] The output end of the power module is connected to the second input port of the central processing unit, and the power module is used to provide the electric energy required by the system.

[0018] Preferably, the output end of the central processing unit is connected to the input end of an LCD display module, and the LCD display module is used to display text, images and other information in electronic equipment and systems; the central processing unit communicates bidirectionally with a storage module and a communication module respectively; and the communication module is an RS485 communication module.

[0019] Preferably, the trip protection module includes a trip output isolation module, a primary alarm output isolation module and a secondary alarm output isolation module;

[0020] The input end of the trip output isolation module is connected to the output end of the central processing unit, and the trip output isolation module is used for performing electrical isolation and circuit breaking operations in the electrical system, and forms at least 12 trip output isolation paths for output;

[0021] The output end of the central processing unit is connected to the input end of the first-level alarm output isolation module and the second-level alarm output isolation module respectively. The first-level alarm output isolation module and the second-level alarm output isolation module are used to monitor the alarm signal in the system and execute the preset function when the trigger condition is met.

[0022] Preferably, the power module is a TPS54 integrated chip, which is used to provide power supply guarantee for the normal operation of subsequent devices; the output of the alarm state and the trip state in the trip protection module adopts a photoelectric coupler with a large current output to separate the control signal from the signal output by the relay state, wherein the output of the photoelectric coupler is a thyristor large current output.

[0023] The beneficial effects of the utility model are:

[0024] The utility model aims to overcome the shortcomings of the prior art and provide a method based on multi-channel online real-time monitoring to solve the problem of multi-point real-time monitoring in the power control system to protect the normal operation of the system.

[0025] This device adopts high-precision transformer isolation sampling technology to achieve high-precision and low-cost measurement of large current in the control loop, ensuring the safety and maintainability of the overall measurement loop. The device uses a liquid crystal display as a human-computer interaction interface, and users can query and set parameters through the interface, which improves the availability and user-friendliness of the device. At the same time, the device uses the RS485 bus to communicate with the background, and transmits the data and status collected by the device in real time to the background DCS system in a timely manner.

[0026] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the embodiments of the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a structural schematic diagram of the phase-to-ground short circuit monitoring and protection device described in an embodiment of the utility model. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0030] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present utility model, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0031] Example:

[0032] This embodiment provides a phase-to-ground short circuit monitoring and protection device.

[0033] See also Figure 1 , the figure shows a phase-to-ground short circuit monitoring and protection device, including a signal conditioning module, a central processing module and a tripping protection module;

[0034] The signal conditioning module is connected to the central processing module and is used to filter, convert and amplify the input signal;

[0035] The central processing module is connected to the tripping protection module and is used to execute instructions, process data and control the operation of the system, monitor and manage the operating status of the system in real time, and respond when an abnormality or fault is detected, triggering a tripping protection system safety;

[0036] The trip protection module is used to detect abnormal conditions in the electrical system and cut off the circuit when an overload, short circuit or other electrical fault occurs, thereby ensuring the safe operation of the equipment and system.

[0037] It should be noted that the utility model adopts 12-way mutual inductor isolation technology to realize the collection of large currents in the power control system and realize safety isolation. Among them, to realize the simultaneous collection and calculation of 12-way signals and make real-time responses, this solution adopts STMicroelectronics' strong computing power and high-performance processor in terms of collection and algorithm, and at the same time utilizes the floating-point unit of the processor, which greatly improves the calculation speed in terms of improving floating-point operations. At the same time, in terms of data collection, the utility model adopts direct memory access technology, which is a technology that allows data to be transmitted between different address spaces without the direct intervention of the processor. This transmission mode provides time for the processor to handle other tasks through hardware control, and greatly reduces the burden on the processor. Therefore, through this solution, real-time collection of multi-channel data can be achieved, and sufficient operating space can be provided for subsequent control tasks.

[0038] Further, the signal conditioning module comprises a signal input module, a CT isolation module, a signal amplification module and a signal conditioning module which are connected in sequence;

[0039] The output end of the signal input module is connected to the input end of the CT isolation module, and the signal input module is used to receive and process input signals, wherein the input signals include temperature, pressure and voltage signals;

[0040] The output end of the CT isolation module is connected to the input end of the signal amplification module, and the CT isolation module is used to isolate the electrical connection between different circuits;

[0041] The output end of the signal amplification module is connected to the input end of the signal conditioning module, and the signal amplification module is used to amplify the signal to reach a level suitable for subsequent processing or transmission;

[0042] The output end of the signal conditioning module is connected to the input end of the central processing module, and the signal conditioning module is used to filter, convert and amplify the input signal.

[0043] It should be noted that the signal input module receives input signals from various sensors and devices. These signals may include analog signals generated by temperature sensors, pressure sensors, and voltage measuring devices; the signal input module performs preliminary processing on the received signals, such as signal filtering, denoising, and standardization processing to ensure the accuracy and stability of the signals; and the CT (current transformer) isolation module is used to provide electrical isolation between circuits to prevent the front-end signal from directly affecting the sensitive signal processing circuit. The isolation module transmits signals through transformers or optical couplers, and at the same time realizes electrical isolation between input and output. The beneficial effect is to effectively protect downstream devices and processing modules by isolating high voltage / high current circuits to avoid damage caused by electrical interference or failure. Among them, the signal amplification module receives the isolated signal, and the signal amplification module amplifies it to increase the weak signal to a level suitable for subsequent processing or transmission. The amplified signal is easier for the subsequent processing module to analyze and convert, thereby improving the overall processing efficiency of the system. The signal conditioning module filters the amplified signal to remove high-frequency noise and low-frequency interference to ensure the purity of the signal. Through filtering and conversion, it provides a pure and stable signal to the central processing module to improve the accuracy and reliability of the system.

[0044] Therefore, through the coordinated work of the signal input module, CT isolation module, signal amplification module and signal conditioning module, the system can realize efficient processing of multiple input signals, ensure the accuracy and reliability of the signals, and finally provide high-quality input signals for the central processing module. The close cooperation between these modules not only improves the safety and reliability of the system, but also expands the application scope and flexibility of the system.

[0045] Furthermore, the signal input module, the CT isolation module, the signal amplification module and the signal conditioning module connected in sequence are set as a first path, and at least 12 signal conditioning paths are formed for output. The utility model adopts 12-way transformer isolation technology to realize the collection of large currents in the power control system and achieves safety isolation, so as to realize the simultaneous collection and calculation of 12-way signals and make real-time responses.

[0046] Further, the central processing module includes an analog-to-digital conversion module, a power module and a central processing unit;

[0047] Wherein, the central processing unit comprises a first input port and a second input port, and the central processing unit is used to execute instructions, process data and control the operation of the system;

[0048] The output end of the analog-to-digital conversion module is connected to the first input port of the central processing unit, and the analog-to-digital conversion module is used to convert the analog signal into a digital signal and provide a basis for processing and analysis by the central processing unit;

[0049] The output end of the power module is connected to the second input port of the central processing unit, and the power module is used to provide the power required by the system;

[0050] The output end of the central processing unit is connected to the input end of the LCD display module, and the LCD display module is used to display text, images and other information in electronic equipment and systems;

[0051] The central processing unit communicates bidirectionally with the storage module and the communication module respectively.

[0052] Among them, the power module adopts the TPS54 series integrated chip for subsequent power supply. This power integrated chip is an integrated voltage regulator device with high voltage input and large current output with integrated high-side MOSFET. Its purpose is to provide simple external compensation and flexible assembly options for current mode control, providing power supply guarantee for the normal operation of subsequent devices.

[0053] It should be noted that the analog-to-digital conversion module receives the analog signal from the signal conditioning module and converts it into a digital signal. The converted digital signal is connected to the first input port of the central processing unit and provided to the CPU for processing and analysis. The analog-to-digital conversion ensures the accurate digitization of the analog signal and improves the data processing accuracy of the system. The power module provides the required electrical energy for the central processing unit to ensure its continuous and stable operation; according to system requirements, the power module converts and adjusts the voltage and current to make it suitable for the working requirements of the central processing unit and other modules. Among them, the power module provides a stable power supply to ensure the reliability and stability of the system, and prevents the impact of power fluctuations on the system, protecting the system from voltage instability or power failure.

[0054] Among them, this device uses the OPA series high-precision precision operational amplifier produced by Texas Instruments to amplify the isolated weak current signal, and uses the characteristics of the operational amplifier to form an emitter follower to further process the amplified signal. The output signal is further isolated by the emitter follower. In addition, its low-impedance output characteristics serve as a bridge for subsequent acquisition circuits, reducing the impact of direct connection between circuits for multi-channel signal acquisition.

[0055] It can be understood that in this step, the LCD display module provides an intuitive user interface, which is convenient for users to view and understand the system status and operation results; and supports multiple information display formats, improving the user experience and operation efficiency of the system.

[0056] In this step, specifically, in the two-way communication between the central processing unit and the storage module and the communication module, the central processing unit stores the processed data and instructions in the storage module for subsequent call and analysis. Through the communication module, the central processing unit realizes two-way communication with the remote device or system, supports data transmission and remote control, and its beneficial effect is that the communication module supports remote data transmission and device control, and improves the flexibility and ease of operation of the system.

[0057] Therefore, the central processing module realizes efficient processing and analysis of various input signals through the close cooperation of the analog-to-digital conversion module, the power module and the central processing unit, and provides an intuitive user interface through the LCD display module, while supporting data storage and remote communication. Such a design not only improves the system's processing power and user experience, but also expands the system's application scope and flexibility.

[0058] Further, the trip protection module includes a trip output isolation module, a primary alarm output isolation module and a secondary alarm output isolation module;

[0059] The input end of the trip output isolation module is connected to the output end of the central processing unit, and the trip output isolation module is used for performing electrical isolation and circuit breaking operations in the electrical system, and forms at least 12 trip output isolation paths for output;

[0060] The output end of the central processing unit is connected to the input end of the first-level alarm output isolation module and the second-level alarm output isolation module respectively. The first-level alarm output isolation module and the second-level alarm output isolation module are used to monitor the alarm signal in the system and execute the preset function when the trigger condition is met.

[0061] Among them, the alarm status output and trip status output use a large current output photocoupler to separate the control signal from the relay status output signal, thereby achieving isolated output of the passive node. At the same time, the output of the photocoupler uses a thyristor large current output, which can effectively control the relays of large-capacity nodes, providing an effective method for the device to control high-power equipment.

[0062] Furthermore, the power supply module is a TPS54 integrated chip, which is used to provide power supply guarantee for the normal operation of subsequent devices.

[0063] It should be noted that the primary alarm output isolation module is used to monitor the primary alarm signals in the system, such as lower-level faults or abnormal conditions. When the trigger conditions are met, the preset alarm function is executed to remind the operator to take appropriate measures. Its input end is connected to the output end of the central processing unit to receive and process the primary alarm signal; the secondary alarm output isolation module is used to monitor the advanced alarm signals in the system, such as serious faults or emergencies. When the trigger conditions are met, a more urgent alarm function is executed to ensure that the operator responds in time. Its input end is connected to the output end of the central processing unit to receive and process the advanced alarm signal. Therefore, in industrial automation and power systems, the tripping protection module protects the equipment and system through the tripping output isolation module and the alarm module. When the tripping output isolation module detects an electrical fault (such as overload or short circuit), it can quickly cut off the circuit to prevent further damage. The primary and secondary alarm modules trigger corresponding alarms according to the severity of the fault, reminding the operator to intervene and maintain in time. Moreover, in data centers and server environments, the stability of the power supply and the protection of the system are crucial. The tripping protection module can quickly isolate the faulty part in the event of a power failure or other abnormal situation to avoid affecting the entire system. At the same time, through the alarm module, the operation and maintenance personnel can obtain system status information in time, respond quickly, and ensure the continuous operation of the server. Therefore, this embodiment not only improves the security and reliability of the system, but also expands its application in the fields of industrial automation, power systems, data centers, and intelligent buildings.

[0064] Furthermore, the output of the alarm state and the trip state in the trip protection module uses a photoelectric coupler with a large current output to separate the control signal from the signal output by the relay state, wherein the output of the photoelectric coupler is a thyristor large current output.

[0065] It can be understood that through the isolation function of the photocoupler, the control signals of the alarm state and the trip state are separated from the actual relay output signal, ensuring that each state is independently controlled without interfering with each other. And the independent photocoupler path ensures that the alarm and trip signals can be transmitted quickly and safely, and the system can respond quickly when an abnormality is detected and take corresponding protection measures.

[0066] The human-computer interaction interface of this device uses a 4-inch LCD screen as the interactive interface. The communication method uses a parallel port to exchange data signals with the processor, which can improve the real-time display of data on the LCD screen, and also ensure the smoothness of data information during human-computer interaction, providing a good and friendly interface for user experience.

[0067] It should be noted that this device uses RS485 MODBUS protocol to communicate with the background, and transmits the collected data or parameters to the background DCS in real time. RS485 can be networked from one point to multiple points. It has the advantages of low interface level, not easy to damage the chip, high transmission speed, strong anti-interference ability, long transmission distance, and support for multiple nodes. Therefore, the communication quality of subsequent transmission signals can be guaranteed.

[0068] The working process of this device is as follows: the signal conditioning module receives and processes various input signals, and transmits the processed signals to the central processing module through filtering, isolation, amplification and conversion. The central processing module converts the analog signal into a digital signal through the analog-to-digital conversion module, and performs real-time monitoring and data processing to ensure the normal operation of the system and the accurate display of data. When the central processing module detects an abnormality or fault, it triggers the tripping protection module, cuts off the circuit through the tripping output isolation module, and issues a corresponding alarm through the alarm module to protect the safety of the equipment and system. The operating status and processing results of the system are displayed through the LCD display module. The central processing module maintains communication with the storage module and the communication module to realize data storage and remote monitoring. That is, through the coordinated work of the above modules, the phase-to-ground short circuit detection and protection device can effectively monitor and protect the electrical system and ensure the safe operation of the equipment and system.

[0069] It should be noted that the utility model provides 12 channels of simultaneous online real-time monitoring, and a tripping circuit composed of three levels of protection, which are divided into primary alarm, secondary alarm and tripping protection. It can control whether each level of each channel participates in the protection action through a switch, and the device also provides 12 channels of real-time alarm or tripping event records, which will not be lost during power failure, thereby providing a reference basis for the maintenance of the power control circuit.

[0070] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0071] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A phase-to-ground short circuit monitoring and protection device, characterized in that: It includes a signal conditioning module, a central processing module and a tripping protection module; The signal conditioning module is connected to the central processing module and is used to filter, convert and amplify the input signal; The central processing module is connected to the trip protection module; The trip protection module is used to detect abnormal conditions in the electrical system and cut off the circuit when an overload or short circuit electrical fault occurs, ensuring the safe operation of the equipment and system; The signal conditioning module comprises a signal input module, a CT isolation module, a signal amplification module and a signal conditioning module which are connected in sequence; The output end of the signal input module is connected to the input end of the CT isolation module, and the signal input module is used to receive and process input signals, wherein the input signals include current signals; The output end of the CT isolation module is connected to the input end of the signal amplification module, and the CT isolation module is used to isolate the electrical connection between different circuits and the signal isolation between the front and rear stages; The output end of the signal amplification module is connected to the input end of the signal conditioning module, and the signal amplification module is used to amplify the signal to reach a level suitable for subsequent processing or transmission; The output end of the signal conditioning module is connected to the input end of the central processing module, and the signal conditioning module is used to filter, convert and amplify the input signal.

2. The phase-to-ground short circuit monitoring and protection device according to claim 1, characterized in that: The signal input module, the CT isolation module, the signal amplification module and the signal conditioning module connected in sequence are set as a first path, and at least 12 signal conditioning paths are formed for real-time monitoring.

3. The phase-to-ground short circuit monitoring and protection device according to claim 1, characterized in that: The central processing module includes an analog-to-digital conversion module, a power supply module and a central processing unit; Wherein, the central processing unit comprises a first input port and a second input port, and the central processing unit is used to execute instructions, process data and control the operation of the system; The output end of the analog-to-digital conversion module is connected to the first input port of the central processing unit, and the analog-to-digital conversion module is used to convert the analog signal into a digital signal and provide a basis for processing and analysis by the central processing unit; The output end of the power module is connected to the second input port of the central processing unit, and the power module is used to provide the electric energy required by the system.

4. The phase-to-ground short circuit monitoring and protection device according to claim 3, characterized in that: The output end of the central processing unit is connected to the input end of the LCD display module, and the LCD display module is used to display text and images in electronic equipment and systems.

5. The phase-to-ground short circuit monitoring and protection device according to claim 3, characterized in that: The central processing unit communicates bidirectionally with the storage module and the communication module respectively.

6. The phase-to-ground short circuit monitoring and protection device according to claim 5, characterized in that: The communication module is an RS485 communication module.

7. The phase-to-ground short circuit monitoring and protection device according to claim 1, characterized in that: The trip protection module includes a trip output isolation module, a primary alarm output isolation module and a secondary alarm output isolation module; The input end of the trip output isolation module is connected to the output end of the central processing unit, and the trip output isolation module is used for performing electrical isolation and circuit breaking operations in the electrical system, and forms at least 12 trip output isolation paths for output; The output end of the central processing unit is connected to the input end of the first-level alarm output isolation module and the second-level alarm output isolation module respectively. The first-level alarm output isolation module and the second-level alarm output isolation module are used to monitor the alarm signal in the system and execute the preset function when the trigger condition is met.

8. The phase-to-ground short circuit monitoring and protection device according to claim 3, characterized in that: The power supply module is a TPS54 integrated chip, which is used to provide power supply guarantee for the normal operation of subsequent devices.

9. The phase-to-ground short circuit monitoring and protection device according to claim 1, characterized in that: The output of the alarm state and the trip state in the trip protection module uses a photoelectric coupler with a large current output to separate the control signal from the signal output by the relay state, wherein the output of the photoelectric coupler is a thyristor large current output.

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