CN114184891A - Direct current power supply fault recording device - Google Patents
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- G01R31/08—Locating faults in cables, transmission lines, or networks
Abstract
The invention discloses a direct-current power supply fault recording device which comprises a power supply module, a signal acquisition and preprocessing module, a CPU (central processing unit) functional module, a storage module, an input/output module, a communication module, an alarm module and an indication module, wherein the power supply module is used for acquiring a signal; the signal acquisition and preprocessing module comprises a DSP data acquisition board, a direct current voltage acquisition module, a direct current acquisition module, a three-phase alternating current voltage acquisition module, a three-phase alternating current acquisition module, a switching value monitoring module and a GPS time service module, monitors and processes the insulation condition of a direct current charging module, a storage battery, a voltage stabilizer and a direct current loop, and transmits the insulation condition to the CPU functional module after identifying fault recording starting conditions; the CPU functional module performs high-speed operation and processing on the acquired signal data, communicates with each peripheral functional module, and sends storage and alarm instructions according to needs. The wave recording device has the advantages of wide data acquisition frequency, high acquisition precision, strong anti-jamming capability, long-time storage of acquired data, synchronization of all monitoring data, complete fault information recording, redundancy of wave recording data, capability of trend analysis and data association analysis and the like.
Description
Technical Field
The invention relates to the technical field of operation maintenance and diagnosis analysis of a direct-current power supply system of a power station, in particular to a direct-current power supply fault recording device.
Background
The direct current power supply system consists of a storage battery pack, a charging module, a feeding and power supply network, a monitoring module and the like, and provides working power supplies for protection devices, automatic devices, circuit breakers and the like in the transformer substation. However, the dc power supply system of the substation is not an ideal system in practice, and is often affected by the quality problems of the dc power supply device (such as switching power supply failure and increase of internal resistance of a storage battery), external interference (such as alternating current channeling and overvoltage coupling), internal disturbance (such as operation of an insulation monitoring device, operation of a voltage stabilizing device, short circuit or grounding), and the like, so as to cause power supply quality pollution of the dc power supply system, thereby causing malfunction or rejection of the electrical device, and seriously threatening the safe operation of the substation.
At present, although various monitoring devices are installed in a direct-current power supply system, the direct-current power supply system is insufficient in data monitoring, the frequency of data acquisition is insufficient, fault information cannot be recorded dynamically, the acquired data cannot be stored for a long time, the data of the monitoring devices are asynchronous, wave recording data lack redundancy, trend analysis cannot be performed, data association analysis is lacked, particularly disturbance data cannot be recorded in a fault state, and therefore the difficulty is brought to the fault analysis of the direct-current power supply system.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a dc power supply fault recording apparatus, so as to solve the problems of insufficient data acquisition frequency, no long-time storage of acquired data, asynchronous monitored data, lack of redundancy of recording data, no trend analysis, lack of data association analysis, etc. of the conventional dc power supply system monitoring apparatus.
In order to achieve the above object, the present invention provides a dc power supply fault recording apparatus, which includes a power supply module, a signal acquisition and preprocessing module, a CPU function module, a storage module, an input/output module, a communication module, an alarm module, and an indication module.
The power module provides power for the fault recording device, and in order to ensure that the fault recording device can normally work when the direct-current power supply fails, the power module selects 2 groups of lithium iron phosphate storage batteries as a self-contained power supply, and the lithium iron phosphate storage batteries have the advantages of light weight, small size, environmental protection, safety, no memory effect and the like, are used as the self-contained power supply of the fault recording device, and have better use effect and longer service life.
The signal acquisition and preprocessing module is used for acquiring and processing signals of the direct-current power supply system equipment, identifying fault recording starting conditions and transmitting the fault recording starting conditions to the CPU functional module; in order to realize comprehensive and accurate monitoring of faults of a direct current power supply system, the signal acquisition and preprocessing module is provided with a DSP data acquisition board, a direct current voltage acquisition module, a direct current acquisition module, a three-phase alternating current voltage acquisition module, a three-phase alternating current acquisition module, a switching value monitoring module and a GPS time service module.
The direct-current voltage acquisition module comprises a voltage sensor and a direct-current signal A/D conditioning circuit and is responsible for monitoring and acquiring control bus voltage, control bus positive ground voltage, control bus negative ground voltage, charging bus voltage, closing bus voltage, storage battery pack voltage and communication 48V voltage.
The direct current acquisition module comprises a current sensor and a direct current signal A/D conditioning circuit and is responsible for monitoring and acquiring data of control bus current, charging bus current and storage battery current.
The three-phase alternating voltage acquisition module comprises a voltage sensor and an alternating signal A/D conditioning circuit and is responsible for monitoring and acquiring data of the three-phase alternating voltage.
The three-phase alternating current acquisition module comprises a current sensor and an alternating signal A/D conditioning circuit and is responsible for monitoring and acquiring data of the three-phase alternating current.
The switching value monitoring module comprises a digital IO isolation circuit and is responsible for monitoring the IO variable state of the strong power end of the direct current system and acquiring data.
The GPS time service module accurately services the direct current voltage acquisition module, the direct current acquisition module, the three-phase alternating current acquisition module and the switching value monitoring module, ensures synchronous acquisition of all the monitoring modules and avoids adverse effects caused by asynchronous data when fault analysis needs to be combined with a plurality of waveforms for joint analysis.
The DSP data acquisition board carries out analog quantity data calculation according to signal data acquired by the direct current voltage acquisition module according to the direct current voltage acquisition module, the direct current acquisition module, the three-phase alternating current voltage acquisition module, the three-phase alternating current acquisition module and the switching value monitoring module, judges fault recording starting, transmits related data to the CPU functional module, and starts fault processing by the CPU functional module. The fault recording starting judgment specifically comprises the steps of identifying and starting direct-current grounding fault recording according to monitoring of positive and negative voltage to earth of a control bus and a data acquisition result, identifying and starting alternating-current channeling fault recording according to monitoring of three-phase alternating-current voltage, three-phase alternating-current, control bus voltage and control bus current and a data acquisition result, identifying and starting direct-current heavy-load fault recording according to monitoring of the control bus current, storage battery voltage and storage battery current and the data acquisition result, identifying and starting abnormal control bus voltage fault recording according to monitoring of the control bus voltage and charging bus voltage and the data acquisition result, identifying and starting 80% voltage fault recording according to monitoring of the control bus voltage and the data acquisition result, identifying and starting abnormal alternating-current power supply fault recording according to monitoring of the three-phase alternating-current voltage and the three-phase alternating-current and the data acquisition result, identifying and starting communication 48V power supply fault recording according to the monitoring and data acquisition results of the communication 48V power supply voltage; and identifying and starting storage battery pack fault recording according to the monitoring and data acquisition results of the closing bus voltage, the closing bus current, the storage battery pack voltage, the storage battery pack current, the charging bus voltage and the charging bus current.
Specifically, in order to improve the acquisition frequency and accuracy of data and reduce high-frequency interference, a DSP chip with the model of TMS320F28335 is selected as a DSP data acquisition board, a single-accuracy floating point operation unit is integrated in the chip, the chip is provided with an on-chip program memory and a data memory, SDRAM and FLASH are expanded outside the chip and used for storing programs and sampling data, when a fault occurs, data 40ms before the fault occurs can be acquired from a cache region, and the integrity of primary fault information recording can be ensured. Specifically, the invention also selects a high-speed analog-digital sampling chip with the model of TLC5510 as a direct-current signal A/D conditioning circuit and an alternating-current signal A/D conditioning circuit, the chip is an 8-bit high-impedance parallel A/D chip manufactured by a CMOS process, the highest acquisition rate can be provided to be 20Maps, the chip not only has a high-speed A/D conversion function, but also is provided with an internal acquisition holding circuit, and the A/D conditioning circuit with the model is selected, so that the acquisition efficiency can be improved, the acquisition of secondary side direct-current power supply signal faults can be realized, and the design of peripheral circuits can be simplified. Specifically, the Hall sensor with the model of HNV025A is selected as a voltage sensor, the Hall sensor with the model of HNC100LA is selected as a current sensor, the HNV025A voltage sensor is a voltage sensor utilizing the Hall effect and the zero magnetic flux principle, can measure direct current, alternating current and various pulses, is electrically insulated, and has the advantages of high precision, good linearity, low temperature drift, wide frequency band, strong anti-interference capability and the like, and the voltage sensor with the model is selected, so that a good data acquisition effect can be realized, interference can be reduced, and the electrical influence on a control level is avoided; the current sensor of the HNC100LA is a new generation current sensor applying the Hall effect principle, can measure direct current, alternating current, pulse and various irregular waveform currents under the condition of electric isolation, has the advantages of high precision, good linearity, low temperature drift, wide frequency band, strong anti-interference capability and the like, and can realize good data acquisition effect, reduce interference and ensure that the control level is not electrically influenced by selecting the voltage sensor of the type. Specifically, in the invention, the high-speed isolation optocoupler 6N137 is selected as the switching value monitoring module, so that the IO variable state of the high-voltage end can be accurately identified, and meanwhile, the isolation function is realized, and the working state of the rear-stage high-voltage end can be ensured not to cause electrical influence on the control level. Specifically, the SKG12AT is selected as the GPS time service module, so that the GPS time service module has the advantages of strong practicability, high precision, wide range, no need of channel connection, no limitation of geographical and climatic conditions and the like, and can better accurately service time under test when applied to the GPS time service module.
The CPU functional module performs high-speed operation and processing on the acquired signal data, communicates with each peripheral functional module, and sends storage and alarm instructions according to the requirement; the CPU function module comprises a main controller and a function module, wherein the function module comprises a direct current voltage parameter analysis module, a direct current parameter analysis module, a three-phase alternating current voltage analysis module, a three-phase alternating current analysis module, a switching value analysis module and a parameter correlation analysis module.
The direct-current voltage parameter analysis module calculates, compares and analyzes acquired control bus voltage, control bus positive-to-ground voltage, control bus negative-to-ground voltage, charging bus voltage, closing bus voltage, storage battery pack voltage and communication 48V voltage data, sets corresponding criteria for each data, alarms when exceeding the criteria range, and tracks and trends of change conditions of abnormal data.
The direct current parameter analysis function module is used for calculating, comparing and analyzing acquired bus making current, charging bus current and storage battery current data, setting corresponding criteria for each data, alarming when the data exceed the criteria range, and tracking and trend judging the change condition of abnormal data.
The three-phase alternating voltage analysis function module is used for calculating, comparing and analyzing the acquired three-phase alternating voltage data, setting corresponding criteria for each data, alarming when the data exceed the criteria range, and tracking and trend judging the change condition of abnormal data.
The three-phase alternating current analysis function module is used for calculating, comparing and analyzing the acquired three-phase alternating current data, setting corresponding criteria for each data, alarming when the data exceed the criteria range, and tracking and trend judging the change condition of abnormal data.
The switching value analysis module is used for carrying out time node analysis on the acquired IO variable state data of the strong power end of the direct current system, and analyzing the parameter change conditions in the direct current system before and after the same time node, so that an analysis basis is provided for accident diagnosis.
And the parameter relevance analysis function module is mainly used for carrying out relevance analysis on the analysis results of the function modules, carrying out relevance analysis according to the change trend or condition of other parameters when a certain parameter of the direct current system is subjected to sudden change in a time node, and providing an analysis basis for accident diagnosis.
In the invention, the main controller selects a control board with the model number of S3C44B0X, an ARM7TDMI core is integrated, the working frequency is 66MHZ, 2 universal DMA channels are provided, 1 multi-master IIC bus controller and 1 IIS bus controller are provided, the data collected by the DSP data collecting board is packaged by an RTL8019AS Ethernet controller, and when the network is abnormal, the data can be temporarily stored in a storage module, so that the integrity of fault wave recording data is ensured.
The storage module records and stores related data according to an instruction issued by the CPU; in the invention, the storage module can select storage equipment such as a hard disk, a CF card and the like to record and store related data.
The input/output module is used for realizing the functions of parameter setting, data output display and the like; in the invention, a liquid crystal display, a mouse, a keyboard and the like can be selected as input/output equipment to realize the functions of parameter setting, data transmission display and the like.
The communication module is used for realizing data interaction, transmission and the like; in the invention, RJ45, RJ232, USB and other communication interfaces can be selected to realize data interaction and transmission.
The alarm module sends out related alarm signals when the monitored parameters exceed the set limit values; in the invention, an audible and visual alarm device can be selected to realize the alarm function.
The indicating module is used for displaying states of a power supply, work, faults, an operation mode and the like.
Has the advantages that: the direct-current power supply fault recording device disclosed by the invention has the advantages of wide data acquisition frequency, high acquisition precision, strong anti-interference capability, long-time storage of acquired data, synchronization of all monitoring data, complete fault information record, redundant recording data, capability of trend analysis and data association analysis and the like.
Drawings
FIG. 1 is a block diagram of the apparatus of the present invention;
FIG. 2 is a DC system load shock wave recording diagram;
FIG. 3 is a chart of AC ingress recording in a DC system;
FIG. 4 is an AC loss recording diagram of the charging module;
fig. 5 is a diagram of the dc bus instantaneous ground recording.
Detailed Description
The technical solution of a low energy consumption building structure according to the present invention will be further described in detail with reference to the following embodiments.
The invention provides a direct-current power supply fault recording device, which is shown in a structural block diagram of fig. 1 and comprises a power supply module, a signal acquisition and preprocessing module, a CPU (central processing unit) functional module, a storage module, an input/output module, a communication module, an alarm module and an indication module.
The power module provides power for the fault recording device, and in order to ensure that the fault recording device can normally work when the direct-current power supply fails, the power module selects 2 groups of lithium iron phosphate storage batteries as a self-contained power supply, and the lithium iron phosphate storage batteries have the advantages of light weight, small size, environmental protection, safety, no memory effect and the like, are used as the self-contained power supply of the fault recording device, and have better use effect and longer service life.
The signal acquisition and preprocessing module is used for acquiring and processing signals of the direct-current power supply system equipment, identifying fault recording starting conditions and transmitting the fault recording starting conditions to the CPU functional module; in order to realize comprehensive and accurate monitoring of faults of a direct current power supply system, the signal acquisition and preprocessing module is provided with a DSP data acquisition board, a direct current voltage acquisition module, a direct current acquisition module, a three-phase alternating current voltage acquisition module, a three-phase alternating current acquisition module, a switching value monitoring module and a GPS time service module.
The direct-current voltage acquisition module comprises a voltage sensor and a direct-current signal A/D conditioning circuit and is responsible for monitoring and acquiring control bus voltage, control bus positive ground voltage, control bus negative ground voltage, charging bus voltage, closing bus voltage, storage battery pack voltage and communication 48V voltage.
The direct current acquisition module comprises a current sensor and a direct current signal A/D conditioning circuit and is responsible for monitoring and acquiring data of control bus current, charging bus current and storage battery current.
The three-phase alternating voltage acquisition module comprises a voltage sensor and an alternating signal A/D conditioning circuit and is responsible for monitoring and acquiring data of the three-phase alternating voltage.
The three-phase alternating current acquisition module comprises a current sensor and an alternating signal A/D conditioning circuit and is responsible for monitoring and acquiring data of the three-phase alternating current.
The switching value monitoring module comprises a digital IO isolation circuit and is responsible for monitoring the IO variable state of the strong power end of the direct current system and acquiring data.
The GPS time service module accurately services the direct current voltage acquisition module, the direct current acquisition module, the three-phase alternating current acquisition module and the switching value monitoring module, ensures synchronous acquisition of all the monitoring modules and avoids adverse effects caused by asynchronous data when fault analysis needs to be combined with a plurality of waveforms for joint analysis.
The DSP data acquisition board carries out analog quantity data calculation according to signal data acquired by the direct current voltage acquisition module according to the direct current voltage acquisition module, the direct current acquisition module, the three-phase alternating current voltage acquisition module, the three-phase alternating current acquisition module and the switching value monitoring module, judges fault recording starting, transmits related data to the CPU functional module, and starts fault processing by the CPU functional module. The fault recording starting judgment specifically comprises the steps of identifying and starting direct-current grounding fault recording according to monitoring of positive and negative voltage to earth of a control bus and a data acquisition result, identifying and starting alternating-current channeling fault recording according to monitoring of three-phase alternating-current voltage, three-phase alternating-current, control bus voltage and control bus current and a data acquisition result, identifying and starting direct-current heavy-load fault recording according to monitoring of the control bus current, storage battery voltage and storage battery current and the data acquisition result, identifying and starting abnormal control bus voltage fault recording according to monitoring of the control bus voltage and charging bus voltage and the data acquisition result, identifying and starting 80% voltage fault recording according to monitoring of the control bus voltage and the data acquisition result, identifying and starting abnormal alternating-current power supply fault recording according to monitoring of the three-phase alternating-current voltage and the three-phase alternating-current and the data acquisition result, identifying and starting communication 48V power supply fault recording according to the monitoring and data acquisition results of the communication 48V power supply voltage; and identifying and starting storage battery pack fault recording according to the monitoring and data acquisition results of the closing bus voltage, the closing bus current, the storage battery pack voltage, the storage battery pack current, the charging bus voltage and the charging bus current.
Specifically, in order to improve the acquisition frequency and accuracy of data and reduce high-frequency interference, a DSP chip with the model of TMS320F28335 is selected as a DSP data acquisition board, a single-accuracy floating point operation unit is integrated in the chip, the chip is provided with an on-chip program memory and a data memory, SDRAM and FLASH are expanded outside the chip and used for storing programs and sampling data, when a fault occurs, data 40ms before the fault occurs can be acquired from a cache region, and the integrity of primary fault information recording can be ensured. Specifically, the invention also selects a high-speed analog-digital sampling chip with the model of TLC5510 as a direct-current signal A/D conditioning circuit and an alternating-current signal A/D conditioning circuit, the chip is an 8-bit high-impedance parallel A/D chip manufactured by a CMOS process, the highest acquisition rate can be provided to be 20Maps, the chip not only has a high-speed A/D conversion function, but also is provided with an internal acquisition holding circuit, and the A/D conditioning circuit with the model is selected, so that the acquisition efficiency can be improved, the acquisition of secondary side direct-current power supply signal faults can be realized, and the design of peripheral circuits can be simplified. Specifically, the Hall sensor with the model of HNV025A is selected as a voltage sensor, the Hall sensor with the model of HNC100LA is selected as a current sensor, the HNV025A voltage sensor is a voltage sensor utilizing the Hall effect and the zero magnetic flux principle, can measure direct current, alternating current and various pulses, is electrically insulated, and has the advantages of high precision, good linearity, low temperature drift, wide frequency band, strong anti-interference capability and the like, and the voltage sensor with the model is selected, so that a good data acquisition effect can be realized, interference can be reduced, and the electrical influence on a control level is avoided; the current sensor of the HNC100LA is a new generation current sensor applying the Hall effect principle, can measure direct current, alternating current, pulse and various irregular waveform currents under the condition of electric isolation, has the advantages of high precision, good linearity, low temperature drift, wide frequency band, strong anti-interference capability and the like, and can realize good data acquisition effect, reduce interference and ensure that the control level is not electrically influenced by selecting the voltage sensor of the type. Specifically, in the invention, the high-speed isolation optocoupler 6N137 is selected as the switching value monitoring module, so that the IO variable state of the high-voltage end can be accurately identified, and meanwhile, the isolation function is realized, and the working state of the rear-stage high-voltage end can be ensured not to cause electrical influence on the control level. Specifically, the SKG12AT is selected as the GPS time service module, so that the GPS time service module has the advantages of strong practicability, high precision, wide range, no need of channel connection, no limitation of geographical and climatic conditions and the like, and can better accurately service time under test when applied to the GPS time service module.
The CPU functional module performs high-speed operation and processing on the acquired signal data, communicates with each peripheral functional module, and sends storage and alarm instructions according to the requirement; the CPU function module comprises a main controller and a function module, wherein the function module comprises a direct current voltage parameter analysis module, a direct current parameter analysis module, a three-phase alternating current voltage analysis module, a three-phase alternating current analysis module, a switching value analysis module and a parameter correlation analysis module.
The direct-current voltage parameter analysis module calculates, compares and analyzes acquired control bus voltage, control bus positive-to-ground voltage, control bus negative-to-ground voltage, charging bus voltage, closing bus voltage, storage battery pack voltage and communication 48V voltage data, sets corresponding criteria for each data, alarms when exceeding the criteria range, and tracks and trends of change conditions of abnormal data.
The direct current parameter analysis function module is used for calculating, comparing and analyzing acquired bus making current, charging bus current and storage battery current data, setting corresponding criteria for each data, alarming when the data exceed the criteria range, and tracking and trend judging the change condition of abnormal data.
The three-phase alternating voltage analysis function module is used for calculating, comparing and analyzing the acquired three-phase alternating voltage data, setting corresponding criteria for each data, alarming when the data exceed the criteria range, and tracking and trend judging the change condition of abnormal data.
The three-phase alternating current analysis function module is used for calculating, comparing and analyzing the acquired three-phase alternating current data, setting corresponding criteria for each data, alarming when the data exceed the criteria range, and tracking and trend judging the change condition of abnormal data.
The switching value analysis module is used for carrying out time node analysis on the acquired IO variable state data of the strong power end of the direct current system, and analyzing the parameter change conditions in the direct current system before and after the same time node, so that an analysis basis is provided for accident diagnosis.
And the parameter relevance analysis function module is mainly used for carrying out relevance analysis on the analysis results of the function modules, carrying out relevance analysis according to the change trend or condition of other parameters when a certain parameter of the direct current system is subjected to sudden change in a time node, and providing an analysis basis for accident diagnosis.
In the invention, the main controller selects a control board with the model number of S3C44B0X, an ARM7TDMI core is integrated, the working frequency is 66MHZ, 2 universal DMA channels are provided, 1 multi-master IIC bus controller and 1 IIS bus controller are provided, the data collected by the DSP data collecting board is packaged by an RTL8019AS Ethernet controller, and when the network is abnormal, the data can be temporarily stored in a storage module, so that the integrity of fault wave recording data is ensured.
The storage module records and stores related data according to an instruction issued by the CPU; in the invention, the storage module can select storage equipment such as a hard disk, a CF card and the like to record and store related data.
The input/output module is used for realizing the functions of parameter setting, data output display and the like; in the invention, a liquid crystal display, a mouse, a keyboard and the like can be selected as input/output equipment to realize the functions of parameter setting, data transmission display and the like.
The communication module is used for realizing data interaction, transmission and the like; in the invention, RJ45, RJ232, USB and other communication interfaces can be selected to realize data interaction and transmission.
The alarm module sends out related alarm signals when the monitored parameters exceed the set limit values; in the invention, an audible and visual alarm device can be selected to realize the alarm function.
The indicating module is used for displaying states of a power supply, work, faults, an operation mode and the like.
The device of the invention is tested, and respectively carries out direct current system load impact, direct current system alternating current fleeing in, charging module alternating current loss and direct current bus instantaneous grounding tests, and the results show that the device can accurately record wave in time, and the test results are shown in fig. 2 to fig. 5.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A direct current power supply fault recording device is characterized by comprising a power supply module, a signal acquisition and preprocessing module, a CPU functional module, a storage module, an input/output module, a communication module, an alarm module and an indication module; the power supply module provides power for the fault recording device; the signal acquisition and preprocessing module monitors and data acquires and processes the insulation conditions of the direct current charging module, the storage battery, the voltage stabilizing device and the direct current loop, and transmits the insulation conditions to the CPU functional module after identifying fault recording starting conditions; the CPU functional module performs high-speed operation and processing on the acquired signal data, communicates with each peripheral functional module, and sends storage and alarm instructions according to the requirement; the storage module records and stores related data according to an instruction issued by the CPU; the input/output module is used for realizing the functions of parameter setting, data output display and the like; the communication module is used for realizing data interaction and transmission; the alarm module sends out related alarm signals when the monitored parameters exceed the set limit values; the indicating module is used for displaying states of a power supply, work, faults, an operation mode and the like.
2. The dc power supply fault recorder according to claim 1, wherein the power module comprises 2 sets of lithium iron phosphate batteries.
3. The dc power supply fault recording device according to claim 1, wherein the signal acquisition and preprocessing module comprises a DSP data acquisition board, a dc voltage acquisition module, a dc current acquisition module, a three-phase ac voltage acquisition module, a three-phase ac current acquisition module, a switching value monitoring module, and a GPS time service module; the direct current voltage acquisition module is responsible for monitoring and acquiring control bus voltage, positive ground voltage of a control bus, negative ground voltage of the control bus, charging bus voltage, closing bus voltage, storage battery pack voltage and communication 48V voltage; the direct current acquisition module is responsible for monitoring and data acquisition of control bus current, charging bus current and storage battery pack current; the three-phase alternating voltage acquisition module is responsible for monitoring and acquiring data of three-phase alternating voltage; the three-phase alternating current acquisition module is responsible for monitoring and acquiring data of three-phase alternating current; the switching value monitoring module is responsible for monitoring the IO variable state of the strong power section of the direct current system and acquiring data; the GPS time service module accurately services the direct current voltage acquisition module, the direct current acquisition module, the three-phase alternating current acquisition module and the switching value monitoring module, and ensures that each monitoring module synchronously acquires.
4. The dc power supply fault recording device according to claim 3, wherein the identified fault recording start conditions of the signal acquisition and preprocessing module include dc ground fault recording, ac ingress fault recording, dc heavy load fault recording, abnormal control bus voltage fault recording, 80% voltage fault recording, abnormal ac power supply fault recording, 48V communication power supply fault recording, and battery pack fault recording.
5. The direct-current power supply fault recorder according to claim 4, wherein the DSP data acquisition board of the signal acquisition and preprocessing module is a DSP chip with model number TMS320F28335, the direct-current signal A/D conditioning circuit and the alternating-current signal A/D conditioning circuit are high-speed analog-digital sampling chips with model number TLC5510, the voltage sensor is a Hall sensor with model number HNV025A, the current sensor is a Hall sensor with model number HNC100LA, the switching value monitoring module is a high-speed isolation optocoupler 6N137, and the GPS time service module is SKG12 AT.
6. The dc power supply fault recording device according to claim 1, wherein the CPU function module includes a main controller and function modules, and the function modules include a dc voltage parameter analysis module, a dc current parameter analysis module, a three-phase ac voltage analysis module, a three-phase ac current analysis module, a switching value analysis module, and a parameter correlation analysis module.
7. The dc power supply fault recording device according to claim 6, wherein the master controller is a control board of type S3C44B0X, and the RTL8019AS ethernet controller is used to package data collected by the DSP data collection board, and when the network is abnormal, the data can be temporarily stored in the storage module, so as to ensure the integrity of fault recording data.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111462765.3A CN114184891A (en) | 2021-11-30 | 2021-11-30 | Direct current power supply fault recording device |
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