CN111856313B - Double-circuit power supply real-time monitoring device - Google Patents
Double-circuit power supply real-time monitoring device Download PDFInfo
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Abstract
The invention provides a double-circuit power supply real-time monitoring device which is characterized by comprising a double-circuit collector, a collecting board and a control main board; the two-way collector is communicated with two ways of alternating current input from the outside; two paths of externally input alternating current obtain phase voltage and phase current through the two-path collector; the output end of the double-path collector is connected with a collecting plate, and the collecting plate converts the phase voltage and the phase current to obtain collected data, wherein the collected data comprises a current voltage waveform, a current voltage effective value, a frequency and a phase angle; the output end of the acquisition board is connected with the control main board, and the control main board judges whether two paths of externally input alternating current generate faults or not according to the current voltage waveform and the effective value of the current voltage; when a fault occurs, the control main board determines the phase position of the fault according to the frequency and the phase angle.
Description
Technical Field
The invention relates to the technical field of circuit fault monitoring, in particular to a double-circuit power supply real-time monitoring device.
Background
At present, in the technical field of power circuit monitoring in the prior art, circuits for general detection all belong to a single-path power supply. While monitoring two or more power supplies simultaneously has been proposed in the prior art, there are variations in fault determination, response time, and the like. Whether the fault occurs or not can not be quickly determined, and the alarm can not be quickly generated after the fault occurs.
Disclosure of Invention
The invention provides a double-circuit power supply real-time monitoring device which is used for solving the problems of real-time monitoring of double-circuit power supplies and poor monitoring effect of the existing monitoring technology.
A double-circuit power supply real-time monitoring device is characterized by comprising a double-circuit collector, a collecting board and a control main board; wherein the content of the first and second substances,
the two-way collector is communicated with two ways of externally input alternating currents and obtains phase voltages and phase currents of the two ways of externally input alternating currents;
the output end of the two-way collector is connected with the input end of a collecting plate, the collecting plate converts the phase voltage and the phase current to obtain collected data, wherein,
the collected data comprises a current voltage waveform, a current voltage effective value, a frequency and a phase angle;
the output end of the acquisition board is connected with the control main board, and the control main board judges whether two paths of externally input alternating current generate faults or not according to the current voltage waveform and the effective value of the current voltage, so that a fault result is obtained; and when the fault result is that the fault is generated, the control main board determines the phase position of the fault according to the frequency and the phase angle.
As an embodiment of the present invention: the double-path collector comprises two groups of current transformers and two groups of voltage transformers, wherein the two groups of current transformers and the two groups of voltage transformers are respectively and electrically connected with two paths of alternating current input from the outside to obtain 6 phase voltages and 6 phase currents.
As an embodiment of the present invention: the acquisition board comprises a sampling unit, the sampling unit comprises a signal conditioning circuit, the phase voltage and the phase current are respectively input into the signal conditioning circuit to obtain a current waveform and a voltage waveform, and the effective value, the frequency and the phase angle of the current voltage are obtained according to the current waveform and the voltage waveform; wherein the content of the first and second substances,
the signal conditioning circuits are multiple, and the input ends of the signal conditioning circuits are respectively connected with one phase of the two paths of externally input alternating current.
As an embodiment of the present invention: the control main board is also connected with a display, and the display is connected with a CPU and a clock chip arranged on the control main board; wherein the content of the first and second substances,
the clock chip is used for carrying out time marking on the acquired data in the control mainboard;
the display can be used for retrieving collected historical data and monitoring the phase voltage and the phase current in real time according to input instructions of a user and the time marks of the collected data;
the display is a touch screen or a touch display panel with a touch function.
As an embodiment of the present invention: the control main board is also connected with a memory, wherein,
the storage comprises a plurality of storage areas, the storage areas are respectively connected with the acquisition board, and each storage area in the storage areas can only store one-phase current or phase voltage.
As an embodiment of the present invention: the control mainboard is provided with an RS485 port;
the RS485 port is connected with an external control terminal according to a data mode preset by the control mainboard, and the method comprises the following steps:
after the RS485 is connected with an external control terminal, converting the external control terminal into a terminal information extraction mode to acquire the equipment information of the external control terminal;
judging whether the external control terminal is one of a wireless external control terminal and a wired external control terminal according to the equipment information;
when the external control terminal is a wireless external control terminal, the wireless external control terminal is switched into a wireless data transmission mode, a preset FPGA debugging unit is called through the control mainboard to construct a wireless data transmission channel, and the data transmission speed is adjusted according to the number of the external control terminals for real-time data transmission;
and when the external control terminal is a wired external control terminal, converting the external control terminal into a wired data transmission mode, performing IP authentication and BAS authentication on the wired external control terminal through the control main board, and directly performing data transmission when the IP authentication and the BAS authentication are both successful.
As an embodiment of the present invention: the control mainboard further constructs a remote control network through the RS485 port, and the method comprises the following steps:
establishing local area networking through the external control terminal, setting each monitoring device as a work station, and marking the work station with a theme;
adding a remote control program in the workstation according to the theme mark;
setting an identification account number and an identification password of the workstation according to the remote control program;
establishing a unique connection path between an external control terminal and the workstation according to the identification account and the identification password;
and according to the unique connection path, constructing a control window of the workstation on the external control terminal to form the remote control network.
One of the embodiments of the present invention is: the control main board is also connected with a fault alarm device, the fault alarm device consists of an alarm and a threshold chip, and the threshold chip is connected with the control main board; wherein the content of the first and second substances,
the alarm comprises one of a buzzer and an audible and visual alarm;
the threshold chip is also connected with the acquisition board, and the threshold chip verifies the fault again when the fault result is that the fault occurs according to the acquired data of the acquisition board. And when the result of the secondary verification is that a fault is generated, the alarm gives an alarm.
One of the embodiments of the present invention is: the threshold chip verifies the fault again when the fault result is fault generation according to the acquired data of the acquisition board, and the alarm device gives an alarm when the fault result is fault generation, wherein the alarm device gives an alarm and the threshold chip comprises the following steps:
acquiring time-frequency parameters of the acquired data;
the acquisition board preprocesses acquired data, removes clutter in the acquired data, and obtains a oscillogram of the acquired data after removing the clutter based on time frequency;
converting the oscillogram into a gray-scale image map, and framing the gray-scale image map according to the time-frequency parameters to obtain a gray-scale difference value of the gray-scale image of the adjacent frame;
judging whether a fault occurs again according to the comparison between the gray level difference value and a preset threshold value, and when the fault occurs, alarming through the alarm; wherein the content of the first and second substances,
the threshold value comprises: the upper limit and the lower limit of the gray scale difference value of the voltage effective value, the upper limit of the gray scale difference value of the distortion degree and the upper limit of the gray scale difference value of the peak value.
One of the embodiments of the present invention is: the control main board judges whether the two paths of externally input alternating currents generate faults or not according to the current voltage waveform and the effective value of the current voltage, and the control main board comprises the following steps:
acquiring the period T of an input power supply through a collecting plate, and calculating the effective value of each phase of output voltage and current in one period:
the effective value of the voltage is as follows:
the effective value of the current is:
wherein: u is instantaneous voltage, i is instantaneous current; u shapeYAn effective voltage representing a Y-th phase; i isYRepresents the effective current of the Y phase; t represents a time;
acquiring low-frequency periods E of multiple phases of an input power supply, and calculating the threshold value of the output voltage and current of each phase in one period:
the voltage threshold is:
the current threshold is:
wherein r represents a phase;
comparing the effective value of the current voltage with the threshold value of the current voltage, and judging that the probability P of the fault is:
wherein, PDYRepresenting the probability of voltage failure; pDLRepresents the probability of the current failure when P isDYOr said PDLOne of which is greater than 1, indicating a fault.
The invention has the beneficial effects that:
(1) the real-time acquisition of phase voltage and phase current of the two-path alternating current input power supply is realized, and meanwhile, the abnormity of the input voltage is analyzed and judged in real time.
(2) And displaying the waveform, effective value, frequency and phase angle of the voltage and current of each input phase in real time.
(3) The retrieval of historical data is realized, and voltage waveform, harmonic analysis and the like of the historical data are displayed.
(4) The data are uploaded to an upper computer in real time through RS485, and the uploading of voltage, current, phase angle, frequency and distortion data is realized; and each monitoring device can be remotely accessed to know the running condition of the on-site power grid through a special network channel for railway signals.
(5) The USB flash disk can be used for realizing the data dump, and the waveform data analysis can be carried out on the dumped data on other computers through special software; meanwhile, voltage waveforms, analysis data and the like can be printed out.
(6) When the power grid index exceeds a preset value, the alarm can be given in time, and the recorded quantity of each phase alarm information is 500.
(7) The device can be used independently, and can also form a local area network through a railway signal communication private network, so that the remote access is convenient and flexible.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a composition structural view in the embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
A double-circuit power supply real-time monitoring device comprises a double-circuit collector, a collecting board and a control main board as shown in figure 1; wherein the content of the first and second substances,
the two-way collector is communicated with two ways of externally input alternating currents and obtains phase voltages and phase currents of the two ways of externally input alternating currents;
the output end of the double-path collector is connected with a collecting plate, and the collecting plate converts the phase voltage and the phase current to obtain collected data, wherein the collected data comprises a current voltage waveform, a current voltage effective value, a frequency and a phase angle;
the output end of the acquisition board is connected with the control main board, and the control main board judges whether two paths of externally input alternating current generate faults or not according to the current voltage waveform and the effective value of the current voltage; when a fault occurs, the control main board determines the phase position of the fault according to the frequency and the phase angle.
The principle of the invention is as follows: the device is developed based on an X86 platform and LABVIEW software, and a hardware part mainly comprises a collecting board, a main board, a display, a mutual inductor and the like. The device is mainly characterized by high acquisition speed, mass data storage, real-time display of input voltage and current waveform, and real-time harmonic analysis of the input voltage. The device can provide a test basis for improving the quality of a field input power grid, and further improve the working stability of the signal power supply; in addition, when signal equipment failure caused by the fact that the quality of the external power grid does not meet the standard occurs, accurate evidence can be provided for judging the failure reason by analyzing the monitoring data.
The invention has the beneficial effects that: the real-time acquisition of phase voltage and phase current of the two-path alternating current input power supply is realized, and meanwhile, the abnormity of the input voltage is analyzed and judged in real time. And displaying the waveform, effective value, frequency and phase angle of the voltage and current of each input phase in real time. The retrieval of historical data is realized, and voltage waveform, harmonic analysis and the like of the historical data are displayed. The data are uploaded to an upper computer in real time through RS485, and the uploading of voltage, current, phase angle, frequency and distortion data is realized; and each monitoring device can be remotely accessed to know the running condition of the on-site power grid through a special network channel for railway signals. The USB flash disk can be used for realizing the data dump, and the waveform data analysis can be carried out on the dumped data on other computers through special software; meanwhile, voltage waveforms, analysis data and the like can be printed out. When the power grid index exceeds a preset value, the alarm can be given in time, and the recorded quantity of each phase alarm information is 500. The device can be used independently, and can also form a local area network through a signal communication private network, so that the remote access is convenient and flexible.
As an embodiment of the present invention: the double-path collector comprises two groups of current transformers and two groups of voltage transformers, wherein the two groups of current transformers and the two groups of voltage transformers are respectively and electrically connected with two paths of alternating current input from the outside to obtain 6 phase voltages and 6 phase currents.
The principle of the invention is as follows: the external monitoring power supply has two paths of three-phase input alternating-current voltages, and the total voltage is 6 phase voltages; two three-phase input alternating currents, total 6 phase currents.
As an embodiment of the present invention: the acquisition board comprises a sampling unit, the sampling unit comprises a signal conditioning circuit, the phase voltage and the phase current are respectively input into the signal conditioning circuit to obtain a current waveform and a voltage waveform, and the effective value, the frequency and the phase angle of the current voltage are obtained according to the current waveform and the voltage waveform; wherein the content of the first and second substances,
the signal conditioning circuits are multiple, and the input ends of the signal conditioning circuits are respectively connected with one phase of the two paths of externally input alternating current.
Only one phase of one circuit is controlled by each signal conditioning circuit, and when a fault occurs, the fault of the phase can be clearly judged.
As an embodiment of the present invention: the control main board is also connected with a display, and the display is connected with a CPU and a clock chip arranged on the control main board; wherein the content of the first and second substances,
the clock chip is used for carrying out time marking on the acquired data in the control mainboard;
the display can be used for retrieving collected historical data and monitoring the phase voltage and the phase current in real time according to input instructions of a user and the time marks of the collected data;
the display is a touch screen or a touch display panel with a touch function.
The monitoring data can be collected based on time sequence, and can also be adjusted in real time through a display.
In one embodiment: real-time waveforms
And the waveform display option is clicked, the waveform information of the two paths of three-phase voltages and currents input in real time at present can be checked, and the application conditions of the power grid and the load input at present can be known in detail.
Real-time data information
And clicking a real-time measurement value option to check the data information of the voltage, the current, the frequency, the phase difference, the distortion degree and the two paths of interphase pressure difference of the current input power grid.
Harmonic analysis
And clicking a harmonic analysis option, checking the content of each harmonic of the current two-path input voltage of each phase, and knowing the power supply condition of the field power grid in real time.
Fault information
Clicking the 'alarm of each phase' option to check the historical alarm condition of each phase, wherein the alarm condition comprises a voltage distortion degree, a voltage effective value and a peak-to-peak value. The waveform information in fault can be checked, and the fault information is stored under 'D: \ alarm information'.
Viewing historical real-time data
Clicking a waveform display tab, clicking a data viewing button, selecting manual directory query, and storing real-time data in a' E: under the directory of \ "data acquisition", waveform data of a certain time of a certain phase is checked by clicking to perform retrieval analysis display. And after browsing, closing the window button to quit.
Alarm threshold setting
Clicking the 'waveform display' tab, inputting the 'management password', displaying an 'alarm threshold' option on the interface, setting the concerned parameters after entering, and storing the parameters to be effective. The alarm threshold comprises an upper limit and a lower limit of a gray difference value of a voltage effective value, an upper limit of a gray difference value of a distortion degree, an upper limit of a gray difference value of a peak-to-peak value and a threshold of a gray difference value of two paths of interphase pressure differences, and when the current input information exceeds the alarm threshold, an external acousto-optic alarm is given.
Correcting settings
Clicking the 'waveform display' tab, inputting the 'correction password', correcting channel parameters, and ensuring the precision of sampling data, wherein the channel parameters comprise two paths of six-phase voltage, six-phase current and frequency.
Communication settings
Clicking a 'waveform display' tab, inputting a 'management password', displaying 'system management' on an interface, setting a communication baud rate, a serial port number and the like, and enabling the communication baud rate, the serial port number and the like to be effective after storage;
storage mode
Clicking the 'waveform display' tab, inputting the 'management password', displaying the 'system management' on the interface, and selecting a storage mode:
(1) not storing-real-time data is not stored, and only data acquisition, analysis and display are carried out;
(2) automatic storage-automatic storage of real-time data, wherein the data are stored for ten days, and after ten days, the data stored at the earliest time are automatically covered by adopting a first-in first-out principle;
(3) manual save-the save time period may be selected, save for 30, 60, 120, 240 minutes may be selected, and saving of waveform data is stopped when time expires.
Shielding alarm sound: the alarm sound shielding can be realized by clicking an alarm silencing key in a waveform display tab, and the alarm sound starting can be realized by clicking alarm starting.
As an embodiment of the present invention: the control main board is also connected with a memory, wherein,
the storage comprises a plurality of storage areas, the storage areas are respectively connected with the acquisition board, and each storage area in the storage areas can only store one-phase current or phase voltage.
And the data of each phase is stored in a partitioned mode, and the data is convenient to call.
As an embodiment of the present invention: the control mainboard is provided with an RS485 port;
the RS485 port is connected with an external control terminal according to a data mode preset by the control mainboard, and the method comprises the following steps:
after the RS485 is connected with an external control terminal, converting the external control terminal into a terminal information extraction mode to acquire the equipment information of the external control terminal;
judging whether the external control terminal is one of a wireless external control terminal and a wired external control terminal according to the equipment information;
when the external control terminal is a wireless external control terminal, the wireless external control terminal is switched into a wireless data transmission mode, a preset FPGA debugging unit is called through the control mainboard to construct a wireless data transmission channel, and the data transmission speed is adjusted according to the number of the external control terminals for real-time data transmission;
and when the external control terminal is a wired external control terminal, converting the external control terminal into a wired data transmission mode, performing IP authentication and BAS authentication on the wired external control terminal through the control main board, and directly performing data transmission when the IP authentication and the BAS authentication are both successful.
The invention acquires the acquired data through different acquisition modes in different control modes. And the different protective equipment transmission methods of the wired external control terminal and the wireless external control terminal can ensure the safety and can accelerate the data transmission speed.
As an embodiment of the present invention: the control mainboard further constructs a remote control network through the RS485 port, and the method comprises the following steps:
establishing local area networking through the external control terminal, setting each monitoring device as a work station, and marking the work station with a theme;
adding a remote control program in the workstation according to the theme mark;
setting an identification account number and an identification password of the workstation according to the remote control program;
establishing a unique connection path between an external control terminal and the workstation according to the identification account and the identification password;
and according to the unique connection path, constructing a control window of the workstation on the external control terminal to form the remote control network.
One of the embodiments of the present invention is: the control main board is also connected with a fault alarm device, and the fault alarm device consists of an alarm and a threshold chip, and the threshold chip is connected with the control main board; wherein the content of the first and second substances,
the alarm comprises one of a buzzer and an audible and visual alarm;
the threshold chip is also connected with the acquisition board, and the threshold chip verifies the fault again when the fault result is that the fault occurs according to the acquired data of the acquisition board. And when the result of the secondary verification is that a fault is generated, the alarm gives an alarm.
The alarm device is an acousto-optic alarm, but is not limited to acousto-optic alarm, and the invention can be connected with a network and can also alarm by informing a human-computer interaction device.
As an embodiment of the present invention: the threshold chip verifies the fault again when the fault result is fault generation according to the acquired data of the acquisition board, and the alarm device gives an alarm when the fault result is fault generation, wherein the alarm device gives an alarm and the threshold chip comprises the following steps:
acquiring time-frequency parameters of the acquired data;
the acquisition board preprocesses acquired data, removes clutter in the acquired data, and obtains a oscillogram of the acquired data after removing the clutter based on time frequency;
converting the oscillogram into a gray-scale image map, and framing the gray-scale image map according to the time-frequency parameters to obtain a gray-scale difference value of the gray-scale image of the adjacent frame;
judging whether a fault occurs again according to the comparison between the gray level difference value and a preset threshold value, and when the fault occurs, alarming through the alarm; wherein the content of the first and second substances,
the threshold value comprises: upper and lower limits of gray scale difference of voltage effective value, upper limit of gray scale difference of distortion degree, and upper limit of gray scale difference of peak-to-peak value
According to the invention, the data of the acquisition board is processed in a gray scale processing mode according to the oscillogram, so that the correctness of the re-verification is improved, and the false alarm behavior is effectively prevented.
One of the embodiments of the present invention is: the control main board judges whether the two paths of externally input alternating currents generate faults or not according to the current voltage waveform and the effective value of the current voltage, and the control main board comprises the following steps:
acquiring the period T of an input power supply through a collecting plate, and calculating the effective value of each phase of output voltage and current in one period:
the effective value of the voltage is as follows:
the effective value of the current is:
wherein: u is instantaneous voltage, i is instantaneous current; u shapeYAn effective voltage representing a Y-th phase; i isYRepresents the effective current of the Y phase; t represents a time;
acquiring low-frequency periods E of multiple phases of an input power supply, and calculating the threshold value of the output voltage and current of each phase in one period:
the voltage threshold is:
the current threshold is:
wherein r represents a phase;
comparing the effective value of the current voltage with the threshold value of the current voltage, and judging that the probability P of the fault is:
wherein, PDYRepresenting the probability of voltage failure; pDLRepresents the probability of the current failure when P isDYOr said PDLOne of which is greater than 1, indicating a fault.
According to the invention, whether a fault occurs is judged through the effective value and the threshold value of the effective value according to the frequency domain, so that the monitoring equipment can judge whether the power supply has a fault in the monitoring process, and the timeliness of alarm monitoring is ensured.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A double-circuit power supply real-time monitoring device is characterized by comprising a double-circuit collector, a collecting board and a control main board; wherein the content of the first and second substances,
the two-way collector is communicated with two ways of externally input alternating currents and obtains phase voltages and phase currents of the two ways of externally input alternating currents;
the output end of the two-way collector is connected with the input end of a collecting plate, the collecting plate converts the phase voltage and the phase current to obtain collected data, wherein,
the collected data comprises a current voltage waveform, a current voltage effective value, a frequency and a phase angle;
the output end of the acquisition board is connected with the control main board, and the control main board judges whether two paths of externally input alternating current generate faults or not according to the current voltage waveform and the effective value of the current voltage, so that a fault result is obtained; when the fault result is that a fault occurs, the control main board determines the phase position of the fault according to the frequency and the phase angle;
the control main board is also connected with a fault alarm device, the fault alarm device consists of an alarm and a threshold chip, and the threshold chip is connected with the control main board; wherein the content of the first and second substances,
the alarm comprises one of a buzzer and an audible and visual alarm;
the threshold chip is also connected with the acquisition board, and the threshold chip verifies the fault again when the fault result is that the fault occurs according to the acquired data of the acquisition board, and alarms through the alarm when the fault result is that the fault occurs;
the threshold chip verifies the fault again when the fault result is fault generation according to the acquired data of the acquisition board, and the alarm device gives an alarm when the fault result is fault generation, wherein the alarm device gives an alarm and the threshold chip comprises the following steps:
acquiring time-frequency parameters of the acquired data;
the acquisition board preprocesses acquired data, removes clutter in the acquired data, and obtains a oscillogram of the acquired data after removing the clutter based on time frequency;
converting the oscillogram into a gray-scale image map, and framing the gray-scale image map according to the time-frequency parameters to obtain a gray-scale difference value of the gray-scale image of the adjacent frame;
judging whether a fault occurs again according to the comparison between the gray level difference value and a preset threshold value, and when the fault occurs, alarming through the alarm; wherein the content of the first and second substances,
the threshold value comprises: the upper limit and the lower limit of the gray scale difference value of the voltage effective value, the upper limit of the gray scale difference value of the distortion degree and the upper limit of the gray scale difference value of the peak value.
2. The real-time monitoring device for the double-circuit power supply according to claim 1, wherein the double-circuit collector comprises two sets of current transformers and two sets of voltage transformers, and the two sets of current transformers and the two sets of voltage transformers are respectively and electrically connected with the two paths of alternating current input from the outside to obtain 6 phase voltages and 6 phase currents.
3. The real-time monitoring device for the two-way power supply according to claim 1, wherein the acquisition board comprises a sampling unit, the sampling unit comprises a signal conditioning circuit, the phase voltage and the phase current are respectively input into the signal conditioning circuit to obtain a current waveform and a voltage waveform, and the effective value, the frequency and the phase angle of the current voltage are obtained according to the current waveform and the voltage waveform; wherein the content of the first and second substances,
the signal conditioning circuits are multiple, and the input ends of the signal conditioning circuits are respectively connected with one phase of the two paths of externally input alternating current.
4. The real-time monitoring device with the double-circuit power supply as claimed in claim 1, wherein the control mainboard is further connected with a display, and the display is connected with a CPU and a clock chip arranged on the control mainboard; wherein the content of the first and second substances,
the clock chip is used for carrying out time marking on the acquired data in the control mainboard;
the display can be used for retrieving collected historical data and monitoring the phase voltage and the phase current in real time according to input instructions of a user and the time marks of the collected data;
the display is a touch screen or a touch display panel with a touch function.
5. The real-time monitoring device with two-way power supply according to claim 1, wherein the control motherboard is further connected with a memory, wherein,
the storage comprises a plurality of storage areas, the storage areas are respectively connected with the acquisition board, and each storage area in the storage areas can only store one-phase current or phase voltage.
6. The real-time monitoring device with the two-way power supply as claimed in claim 1, wherein the control mainboard is provided with an RS485 port;
the RS485 port is connected with an external control terminal according to a data mode preset by the control mainboard, and the method comprises the following steps:
after the RS485 is connected with an external control terminal, converting the external control terminal into a terminal information extraction mode to acquire the equipment information of the external control terminal;
judging whether the external control terminal is one of a wireless external control terminal and a wired external control terminal according to the equipment information;
when the external control terminal is a wireless external control terminal, the wireless external control terminal is switched into a wireless data transmission mode, a preset FPGA debugging unit is called through the control mainboard to construct a wireless data transmission channel, and the data transmission speed is adjusted according to the number of the external control terminals for real-time data transmission;
and when the external control terminal is a wired external control terminal, converting the external control terminal into a wired data transmission mode, performing IP authentication and BAS authentication on the wired external control terminal through the control main board, and directly performing data transmission when the IP authentication and the BAS authentication are both successful.
7. The real-time monitoring device for the double-circuit power supply as claimed in claim 6, wherein the control motherboard further constructs a remote control network through the RS485 port, comprising the steps of:
establishing local area networking through the external control terminal, setting each monitoring device as a work station, and marking the work station with a theme;
adding a remote control program in the workstation according to the theme mark;
setting an identification account number and an identification password of the workstation according to the remote control program;
establishing a unique connection path between an external control terminal and the workstation according to the identification account and the identification password;
and according to the unique connection path, constructing a control window of the workstation on the external control terminal to form the remote control network.
8. The real-time monitoring device for the two-way power supply according to claim 1, wherein the control main board judges whether the two-way alternating current input from the outside has a fault according to the current voltage waveform and the effective value of the current voltage, and the method comprises the following steps:
acquiring the period T of an input power supply through a collecting plate, and calculating the effective value of each phase of output voltage and current in one period:
the effective value of the voltage is as follows:
the effective value of the current is:
wherein: u is instantaneous voltage, i is instantaneous current; u shapeYAn effective voltage representing a Y-th phase; i isYRepresents the effective current of the Y phase; t represents a time;
acquiring low-frequency periods E of multiple phases of an input power supply, and calculating the threshold value of the output voltage and current of each phase in one period:
the voltage threshold is:
the current threshold is:
wherein r represents a phase;
comparing the effective value of the current voltage with the threshold value of the current voltage, and judging that the probability P of the fault is:
wherein, PDYRepresenting the probability of voltage failure; pDLRepresents the probability of the current failure when P isDYOr said PDLOne of which is greater than 1, indicating a fault.
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| CN102222904B (en) * | 2011-05-31 | 2014-07-09 | 北京交通大学 | Direct-current dual-circuit power supply for supplying power |
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