A fault recording device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU HOPEWELL TECH
- Filing Date
- 2025-08-13
- Publication Date
- 2026-07-21
Smart Images
Figure CN224536113U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power system technology, and in particular to a fault recording device used in power system monitoring cabinets or smart grid fault analysis systems. Background Technology
[0002] When a fault occurs in the power grid system (such as a single-phase ground fault), a zero-sequence current is generated on the feeder. Protection devices can locate the faulty branch or trip it by detecting whether the output signal of the zero-sequence current transformer exceeds its set value. However, protection devices are generally located far from the current transformers, resulting in long secondary output lines that cause severe signal attenuation and make it difficult to accurately pinpoint the fault location. Therefore, accurate judgment must be made through waveform recording and playback. However, currently available zero-sequence current protection devices typically only compare the effective value of the current transformer output signal to see if it exceeds a threshold, without recording the zero-sequence current waveform at the time of the fault. This results in the inability to store waveform data, reproduce the fault phenomenon using the waveform data, or transmit the waveform data remotely. Summary of the Invention
[0003] The purpose of this invention is to provide a fault recording device that enables waveform data storage and remote transmission. It has a simple structure, low cost, and is reliable and fast in communication.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: A fault recording device, comprising: The data acquisition module is responsible for discrete sampling of the input signal and fault detection and judgment. The data acquisition module has a large-capacity flash memory and a conditioning circuit including multiple transformers with different ratios connected in parallel to the output of the zero-sequence current transformer. The conditioning circuit has multiple single-chip microcomputer acquisition boards operating in parallel. The waveform recording module is based on a microcontroller of model MC68332. The waveform recording module includes an AD conversion circuit connected to the output of the conditioning circuit, a storage unit for storing the digital data converted by the AD conversion circuit, and a monitoring module controllably connected to the AD conversion circuit and the storage unit. The waveform recording module is responsible for data acquisition, waveform recording start judgment, and fault file generation. The communication module transmits data to the remote waveform recording master station via network communication based on the TCP / IP protocol, and transmits the waveform data in the storage unit to the remote station. The power supply module is used to supply power to the data acquisition module, waveform recording module and communication module.
[0005] The above scheme is further described in that each microcontroller acquisition board in the data acquisition module has the same function, independently responsible for the synchronous acquisition, high-speed conversion, and various fault start judgment of 16 analog quantities, as well as the acquisition and change judgment of 32 switch quantities; using the sampling pulse synchronized by the 1PPS second pulse of GPS, the input quantities are continuously sampled synchronously and converted by A / O, the acquired data is stored in the designated RAM storage area, and is continuously refreshed in a loop. Once the calculated start quantity meets the start condition, the data of each segment before and after the fault is transferred to the large-capacity flash memory in accordance with the national standard, and the fault occurrence signal is notified to the monitoring module through the dual-port RAM.
[0006] The above scheme is further described in that the storage unit of the waveform recording module is a hard disk with an IDE interface. The waveform recording module consists of several data acquisition boards with the same function. Each data acquisition board is responsible for synchronously acquiring 16 analog signals and 32 digital signals. The number of data acquisition boards is determined by the number of analog and digital signals to be acquired. The monitoring module is responsible for reading data from each data acquisition board through dual-port RAM in case of a fault and storing the data in the form of a fault file on the hard disk. Then, it reads data from the hard disk periodically or when a command is received and communicates with the remote waveform recording master station at high speed through the communication module. The monitoring module also receives remote setting modification and manual start commands from the waveform recording master station and transmits the relevant commands to each data acquisition board.
[0007] Furthermore, the above solution uses the RTL8019AS chip for the communication module.
[0008] Furthermore, the power module has a MAX1232 microprocessor monitor for online monitoring of the power supply voltage.
[0009] Furthermore, the above-mentioned solution further includes a plug-in structure in which the data acquisition module, waveform recording module, communication module, and power supply module of the device are inserted into a single housing to form an organic whole.
[0010] Furthermore, the AD conversion circuit described above is a 14-bit high-speed serial AD converter of model AD7851.
[0011] Furthermore, the above solution specifies that the high-capacity flash memory is model K9F1208.
[0012] This invention improves the reliability and communication speed of the waveform recording device by employing high-performance integrated chips and an optimized system architecture. The data acquisition module uses a large-capacity flash memory, replacing most of the original small-capacity and expensive static RAM. The monitoring module uses a microcontroller-controlled hard drive with an IDE interface to store fault data transmitted from each data acquisition board, replacing the traditional data storage method that required real-time transmission of fault data to a back-end computer via serial or parallel communication. Data transmission with the remote waveform recording master station is achieved using microcontroller-controlled network communication based on the TCP / IP protocol. This structure allows the waveform recording device to store data locally during faults. Upon receiving a remote data retrieval command, the data is read from the hard drive and directly transmitted by the monitoring module to the remote waveform recording master station or dispatch center via Ethernet, thus solving the traditional bottleneck problem in data communication between the front-end and back-end systems. This invention has good versatility and scalability, meeting the high reliability and high performance requirements of the continuously evolving power system for fault waveform recording devices in field operation. Attached Figure Description
[0013] Appendix Figure 1 This is a schematic diagram of the frame design structure of this utility model; Appendix Figure 2 for Figure 1 A schematic diagram of the overall structure of the device; Appendix Figure 3 for Figure 1 A schematic diagram of the data acquisition module structure; Appendix Figure 4 for Figure 1 A schematic diagram of the monitoring module structure. Detailed Implementation
[0014] The following will further explain the concept, specific structure and technical effects of the utility model in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the utility model.
[0015] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.
[0016] See Figure 1 , 2As shown in Figures 3 and 4, this utility model relates to a fault recording device, which includes: a data acquisition module 1, a recording module 2, a communication module 3, and a power supply module 4. Each module forms a plug-in structure and is inserted into a box to form an organic whole, which is convenient for assembly and maintenance.
[0017] The data acquisition module 1 is responsible for discrete sampling of the input signal and fault detection and judgment. The data acquisition module has a large-capacity flash memory and a conditioning circuit including multiple transformers with different ratios connected in parallel to the output of the zero-sequence current transformer. The conditioning circuit has multiple single-chip microcomputer acquisition boards operating in parallel. Figure 3 As shown, in this embodiment, the configuration design employs a scheme of multiple microcontroller acquisition boards operating in parallel. Each microcontroller acquisition board has the same function, independently responsible for the synchronous acquisition, high-speed conversion, and fault start judgment of 16 analog quantities, as well as the acquisition and change judgment of 32 digital quantities. The acquisition board mainly consists of a pre-filter, sample-and-hold (S / H), multiplexer (MPX), analog-to-digital converter (A / D), and the microcontroller main system. During device operation, the sampling pulse synchronized by the 1PPS pulse of GPS continuously samples and performs A / O conversion on each input quantity. Under normal circumstances, the acquired data is stored in the designated RAM storage area and continuously refreshed. Once the calculated start quantity meets the start condition, the data of each segment before and after the fault is transferred to the large-capacity flash memory according to national standards. At the same time, the fault occurrence signal is notified to the monitoring module 21 of the waveform recording module through the dual-port RAM. The model of the large-capacity flash memory is K9F1208.
[0018] The waveform recording module 2 is built based on a microcontroller of model MC68332. Module 2 includes an AD conversion circuit connected to the output of the conditioning circuit, a storage unit for storing the digital data converted by the AD conversion circuit, and a monitoring module 21 controllably connected to the AD conversion circuit and the storage unit. In this embodiment, the storage unit of the waveform recording module is a hard drive with an IDE interface, and the AD conversion circuit is a 14-bit high-speed serial AD converter of model AD7851. The waveform recording section consists of several data acquisition boards with identical functions. Each data acquisition board is responsible for synchronously acquiring 16 analog signals and 32 digital signals. The number of data acquisition boards is determined by the number of analog and digital signals to be acquired, and can be easily expanded according to the actual situation on site. A single waveform recording device can be configured with up to 6 data acquisition boards, so it can acquire up to 96 analog signals and 192 digital signals. The waveform recording module is mainly responsible for data acquisition, waveform recording start judgment, and fault file generation.
[0019] Figure 4As shown, the monitoring module 21 is responsible for communication with each acquisition module, storing fault data, and transmitting information with the waveform recording master station or dispatcher. In case of a fault, the monitoring module reads data from each data acquisition board via dual-port RAM and stores the data as a fault file on the hard disk. Then, it periodically or upon receiving a command, reads data from the hard disk and communicates with the dispatcher at a high speed of 10 Mbps via the network control unit. The monitoring module also receives remote setting modification and manual start commands from the waveform recording master station and transmits the relevant commands to each data acquisition board.
[0020] Communication module 3 uses TCP / IP protocol for network communication to transmit data with the remote waveform recording master station, transmitting the waveform data in the storage unit remotely. Communication module 3 uses the RTL8019AS chip, which is inexpensive, easy to control, has good program portability, is NE2000 compatible, and is also very easy to interface with microcontrollers. Its main performance characteristics include: 1) Compliant with EarthNet2 and IEEE 802.3 standards; 2) Supports 8 / 16-bit bus operation; 3) Built-in 16K SRAM for transmit and receive buffers, which can reduce the speed requirements of the main processor; d) Full-duplex operation mode, receiving and transmitting can reach a rate of 10Mbps simultaneously. 4) Supports R-J45 interface; 5) Built-in 10Base-T transceiver, requiring fewer external components.
[0021] Power module 4 is used to power the data acquisition module, waveform recording module and communication module; power module 4 has a MAX1232 microprocessor monitor to monitor the power supply voltage online; main performance: AVSS: 5V±5% analog power supply; monitoring voltage range, 4.5V-5.75V; minimum reset pulse of 250ms.
[0022] This invention improves the reliability and communication speed of the waveform recording device by employing high-performance integrated chips and an optimized system architecture. The data acquisition module uses a large-capacity flash memory, replacing most of the original small-capacity and expensive static RAM. The monitoring module uses a microcontroller-controlled hard drive with an IDE interface to store fault data transmitted from each data acquisition board, replacing the traditional data storage method that required real-time transmission of fault data to a back-end computer via serial or parallel communication. Data transmission with the remote waveform recording master station is achieved using microcontroller-controlled network communication based on the TCP / IP protocol. This structure allows the waveform recording device to store data locally during faults. Upon receiving a remote data retrieval command, the data is read from the hard drive and directly transmitted by the monitoring module to the remote waveform recording master station or dispatch center via Ethernet, thus solving the traditional bottleneck problem in data communication between the front-end and back-end systems. This invention has good versatility and scalability, meeting the high reliability and high performance requirements of the continuously evolving power system for fault waveform recording devices in field operation.
[0023] While the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention should not be limited to the same structure and operation as described above and the accompanying drawings. For those skilled in the art, many equivalent improvements and variations can be made to the above embodiments through logical analysis, reasoning or limited experiments without exceeding the concept and scope of the present invention, but these improvements and variations should all fall within the scope of protection claimed by the present invention.
Claims
1. A fault recording device, characterized in that, have: The data acquisition module (1) is responsible for discrete sampling of input signals and fault detection and judgment. The data acquisition module has a large-capacity flash memory and a conditioning circuit including multiple transformers with different ratios connected in parallel to the output of the zero-sequence current transformer. The conditioning circuit has multiple single-chip microcomputer acquisition boards running in parallel. The waveform recording module (2) is based on a single-chip microcomputer of model MC68332. The waveform recording module (2) includes an AD conversion circuit connected to the output of the conditioning circuit, a storage unit for storing the digital data converted by the AD conversion circuit, and a monitoring module (21) controllably connected to the AD conversion circuit and the storage unit. The waveform recording module is responsible for data acquisition, waveform recording start judgment, and fault file generation. The communication module (3) transmits data to the remote waveform recording master station via network communication based on the TCP / IP protocol, and transmits the waveform data in the storage unit to the remote station. The power supply module (4) is used to supply power to the data acquisition module, waveform recording module and communication module.
2. The fault recording device according to claim 1, characterized in that, Each microcontroller acquisition board in the data acquisition module has the same function, independently responsible for the synchronous acquisition, high-speed conversion, various fault start judgment, and acquisition and change judgment of 32 switch quantities. It uses the sampling pulse synchronized by the 1PPS second pulse of GPS to continuously sample and convert each input quantity synchronously, save the acquired data in the designated RAM storage area, and continuously refresh it. Once the calculated start quantity meets the start condition, it transfers the data of each segment before and after the fault to the large-capacity flash memory according to the national standard, and at the same time informs the monitoring module (21) of the fault occurrence signal through the dual-port RAM.
3. The fault recording device according to claim 1, characterized in that, The storage unit of the waveform recording module is a hard disk with an IDE interface. The waveform recording module (2) consists of several data acquisition boards with the same function. Each data acquisition board is responsible for synchronously acquiring 16 analog signals and 32 digital signals. The number of data acquisition boards is determined by the number of analog and digital signals to be acquired. The monitoring module is responsible for reading data from each data acquisition board through dual-port RAM when a fault occurs, and storing the data in the form of a fault file on the hard disk. Then, it reads the data from the hard disk periodically or when a command is received, and communicates with the remote waveform recording master station at high speed through the communication module (3). The monitoring module also receives remote setting modification and manual start commands from the waveform recording master station, and transmits the relevant commands to each data acquisition board.
4. The fault recording device according to claim 1, characterized in that, The communication module (3) uses the RTL8019AS chip.
5. The fault recording device according to claim 1, characterized in that, The power module (4) has a MAX1232 microprocessor monitor for online monitoring of the power supply voltage.
6. The fault recording device according to claim 1, characterized in that, The data acquisition module, waveform recording module, communication module, and power supply module of the device form a plug-in structure, which are inserted into a box to form an organic whole.
7. The fault recording device according to claim 1, characterized in that, The AD conversion circuit is a 14-bit high-speed serial AD converter, model AD7851.
8. The fault recording device according to claim 1, characterized in that, The high-capacity flash memory is model number K9F1208.