CN113922504A - Method, system, equipment and storage medium for online intelligent monitoring and protection of alternating current load - Google Patents
Method, system, equipment and storage medium for online intelligent monitoring and protection of alternating current load Download PDFInfo
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- CN113922504A CN113922504A CN202111194421.9A CN202111194421A CN113922504A CN 113922504 A CN113922504 A CN 113922504A CN 202111194421 A CN202111194421 A CN 202111194421A CN 113922504 A CN113922504 A CN 113922504A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/28—Supervision thereof, e.g. detecting power-supply failure by out of limits supervision
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/30—Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations
- G06F1/305—Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations in the event of power-supply fluctuations
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/40—Display of information, e.g. of data or controls
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/242—Home appliances
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Power Engineering (AREA)
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
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Abstract
An online intelligent monitoring protection method, a system, equipment and a storage medium of an alternating current load, wherein the method comprises S1, initializing parameters; s2, obtaining voltages V1 and V2; s3, converting the voltage V1 and V2 into currents Iu and Iv; s4, setting parameters; s5, processing parameters by the CPU processing unit; s6, whether Von is effective or not; s7, whether the operation flag is equal to 0; s8, calculating a first real-time delay time T1; whether S9 and T1 are larger than the starting delay time Ton or not; s10, setting an operation flag equal to 1; s11, whether the absolute value of the difference between the current parameters Iu and Iv is smaller than the current deviation value A or not; whether S12, Ic1 are greater than Ici; s13, calculating a second real-time delay time T2; s14, T2 whether the time parameter value Terr; s15, outputting a fault signal Sout; s16, displaying fault information Err; s17, whether a reset key signal exists or not; and S18, displaying the real-time current value. The invention has the advantages of real-time online adjustment of protection parameters and integration of network system control.
Description
Technical Field
The invention relates to an online intelligent monitoring protection method, a system, equipment and a storage medium for an alternating current load.
Background
The ac load has many practical applications, such as wide application in household equipment and modern industrial production equipment, and the ac equipment may actually have some abnormal situations in the application, such as load damage, line disconnection or short circuit, etc., and if the abnormality occurs during the use and is not found, the ac load may cause inconvenience or loss to the actual production and life. In the aspect of industrial production, cost is usually considered, a protection device needs to be additionally added according to application requirements, in the prior art, a protection switch or a protection device such as a circuit breaker, a relay and a fuse is usually and simply added for industrial loads, but the protection mode is relatively crude, protection parameters cannot be adjusted on line at any time according to requirements, and the protection parameters cannot be integrated in a network system to perform centralized management monitoring and the like.
Disclosure of Invention
In order to solve the problems, the invention provides an online intelligent monitoring protection method, a system, equipment and a storage medium for the society, wherein the online intelligent monitoring protection method can adjust the protection parameters in real time and integrate an alternating current load controlled by a network system.
The technical scheme of the invention is as follows: the method for online intelligent monitoring and protection of the alternating current load comprises the following steps:
s1, initializing parameters, and setting the operation flag = 0; the maximum current deviation value A allowed by a load and caused by error factors of a sensor and/or a conversion circuit device is included;
s2, acquiring a voltage value V1 of the first current analog quantity and a voltage value V2 of the second current analog quantity of the load in real time;
s3, converting the voltage value V1 of the first current analog quantity and the voltage value V2 of the second current analog quantity into a first current parameter Iu and a second current parameter Iv representing the actual current magnitude by the CPU processing unit;
s4, respectively setting input starting delay time analog quantity Von, overload protection value analog quantity Vci and overload protection delay time analog quantity Verr through a parameter setting unit;
s5, converting the start delay time analog quantity Von, the overload protection value analog quantity Vci and the overload protection delay time analog quantity Verr into a start delay time parameter value Ton, an overload protection current parameter value Ici and an overload protection delay time parameter value Terr respectively by the CPU processing unit;
s6, judging whether the externally input load starting switch value (Vst) is effective or not; if yes, go to step S7; if not, returning to the step S2;
s7, judging whether the operation flag is equal to 0; if yes, the step S8 is entered, if no, the step S10 is entered;
s8, starting a first detection delay timer;
s9, judging whether the first detection delay timer T1 is larger than the starting delay time parameter value Ton or not; if yes, entering the step S10, and if not, keeping the step S9; the above steps are circulated until the first detection delay timer T1 is greater than the starting delay time parameter value Ton;
s10, setting an operation flag equal to 1;
s11, judging whether the absolute value of the difference between the first current parameter Iu and the second current parameter Iv is smaller than the maximum current deviation value A; if yes, the step S12 is entered, if not, the step S15 is entered;
s12, judging whether the average value Ic1 of the first current parameter (Iu) and the second current parameter (Iv) is larger than the overload protection current parameter value Ici; if yes, the step S13 is entered, if not, the step S18 is entered;
s13, starting a second detection delay timer;
s14, judging whether the second detection delay timer T2 is larger than the overload protection delay time parameter value Terr; if yes, the step S15 is entered, if not, the step S18 is entered;
s15, outputting a fault protection instruction Sout which controls an output protection unit to execute protection behaviors;
s16, displaying fault information Err on the display screen;
s17, judging whether an external reset Key Key signal exists or not, if so, returning to the step S1; if not, returning to the step S15;
and S18, displaying the real-time current value on the display screen, and returning to the step S2.
The invention also provides an on-line intelligent monitoring protection system of the alternating current load, which comprises the following components:
the power conversion unit acquires primary electric energy from an external power supply and converts the primary electric energy into a power supply with stable voltage required by each unit;
the key display unit is used for inputting instructions to the CPU processing unit and displaying output information of the CPU processing unit;
the load current detection unit acquires a voltage value V1 of the first current analog quantity and a voltage value V2 of the second current analog quantity, and sends the voltage value V1 of the first current analog quantity and the voltage value V2 of the second current analog quantity to the analog IO port of the CPU processing unit;
the CPU processing unit is responsible for receiving the key information and the communication instruction of the upper computer, acquiring the load current information and analyzing and processing the load current information according to the logic set by the program; converting the analog quantity acquired by the load current detection unit into a current value, displaying the current value through a key/display unit, and outputting a fault protection instruction to an output protection unit when a fault occurs so as to execute a protection action; according to the communication instruction received by the serial port communication unit, corresponding data are returned to the upper computer after being analyzed;
the serial port communication unit is used for communicating information between the load CPU processing unit and an external upper computer and integrating monitoring and protecting systems of different devices into a network capable of being managed in a centralized manner;
the load starting signal unit is used for sending a load starting signal input from the outside to the CPU processing unit;
the parameter setting unit is used for carrying out normalization on the protection current parameter to be set and the starting delay and protection delay parameters through analog quantity values and inputting the parameters to the CPU processing unit;
and the output protection unit is responsible for executing the protection instruction sent by the CPU processing unit.
As an improvement of the invention, the key display unit is composed of a key device and an LED digital display component.
As an improvement of the invention, the load current detection unit is composed of two groups of mutual inductors taking a ring-shaped magnetic core as a core and a signal rectification filter circuit.
As an improvement of the invention, the CPU processing unit is composed of a single chip microcomputer and a peripheral circuit thereof.
As an improvement of the invention, the serial port communication unit is composed of a 485 communication chip and a peripheral circuit thereof.
As an improvement of the invention, the parameter setting unit is composed of three external adjustable analog potentiometers.
As an improvement of the invention, the output protection unit is composed of a miniature relay circuit and provides a set of normally open or normally closed contact outputs according to requirements.
The invention also provides an online intelligent monitoring and protecting device of the alternating current load, which comprises a central processing unit and a memory connected with the central processing unit, wherein the memory stores a computer program, and the computer program is used for realizing the online intelligent monitoring and protecting method of the alternating current load according to claim 1 when being executed by the central processing unit.
The invention also provides a storage medium storing a computer program executable for implementing the method for online intelligent monitoring protection of an alternating current load according to claim 1.
According to the requirements of practical application, whether the load works in a reasonable range is judged by comparing the current of the alternating current load with the set module quantity parameters, on one hand, the current of the current load can be displayed in real time, on the other hand, the collected external data and the load condition calculated according to a program are sent through the serial port communication unit, the communication instruction sent by the upper computer is received, the output protection unit is controlled to act in time when the load is abnormal, and the external load can be protected by cutting off the power supply in time. Compared with the prior art, the invention has the following advantages:
firstly, through the connection of communication, can integrate the operation of a plurality of load devices in production field and the protection condition to a system management, promote the networking of production, made things convenient for the management and the maintenance of production process.
And secondly, current parameters of the current load operation are displayed in real time, so that field operators can know the working condition of each load, and compared with the existing invisible protection technology, the method improves the fine management of the production process.
And thirdly, the load protection parameters are adjustable, the normal working range of the load can be set, and the setting of the start detection delay parameters and the setting of the overload protection delay parameters can be provided for the short-time fluctuation phenomena caused by the starting current impact problem of the motor load and the sudden load increase and decrease in the production process, so that the load is protected more intelligently and reasonably, and the misoperation condition possibly occurring in a passive protection mode is also avoided.
And fourthly, the two paths of currents can be detected simultaneously, so that whether overload and overcurrent exist or not can be evaluated, whether phase loss or electric leakage exists or not can be evaluated, and the protection is more comprehensive and more intelligent.
And fifthly, the programmable programmed control has the advantage of meeting the requirements of intelligent upgrading and reconstruction for changing different load protection schemes according to different production requirements.
Drawings
FIG. 1 is a block diagram of an embodiment of the method of the present invention.
Fig. 2 is a block diagram of the system of the present invention.
Detailed Description
Referring to fig. 1, fig. 1 discloses an online intelligent monitoring protection method for an ac load, which includes the following steps:
s1, initializing parameters, and setting the operation flag = 0; the maximum current deviation value A allowed by a load and caused by error factors of a sensor and/or a conversion circuit device is included;
s2, acquiring a voltage value V1 of the first current analog quantity of the load and a voltage value V2 of the second current analog quantity V2 in real time;
s3, converting the voltage value V1 of the first current analog quantity and the second current analog quantity V2 into a first current parameter Iu and a second current parameter Iv representing the actual current magnitude by the CPU processing unit;
s4, respectively setting input starting delay time analog quantity Von, overload protection value analog quantity Vci and overload protection delay time analog quantity Verr through a parameter setting unit; in this embodiment, three parameter analog quantities, namely the start delay time voltage analog quantity Von, the overload protection value analog quantity Vci and the overload protection delay time analog quantity Verr, can be manually adjusted and set through corresponding potentiometers on the one hand, and can also be set by independently sending specified data to each monitor device through communication connection of an upper computer according to needs, so that the intelligence and the flexibility of the product are increased. For the key display, a reset key can be used for manual direct reset and restart after field fault removal, and a reset instruction of the monitoring equipment needing forced reset can be communicated. And for the switching key, the switching key is used for switching the content displayed by the current LED, one parameter is displayed every time the switching key is pressed, the key acts to circularly display the starting delay time analog quantity Von, the overload protection value analog quantity Vci, the overload protection delay time analog quantity Verr and the current detected current value, and thus when the three parameters of the starting delay time analog quantity Von, the overload protection value analog quantity Vci and the overload protection delay time analog quantity Verr are manually adjusted, the switching key can be switched to a corresponding display interface to carry out more precise visual parameter setting.
S5, converting the start delay time analog quantity Von, the overload protection value analog quantity Vci and the overload protection delay time analog quantity Verr into a start delay time parameter value Ton, an overload protection current parameter value Ici and an overload protection delay time parameter value Terr respectively by the CPU processing unit;
s6, judging whether the externally input load starting switch value (Vst) is effective or not; if yes, go to step S7; if not, returning to the step S2;
s7, judging whether the operation flag is equal to 0; if yes, the step S8 is entered, if no, the step S10 is entered;
s8, starting a first detection delay timer;
s9, judging whether the first detection delay timer T1 is larger than the starting delay time parameter value Ton or not; if yes, entering the step S10, and if not, keeping the step S9; the steps are circulated until the first detection delay timer T1 is judged to be larger than the starting delay time parameter value Ton; for the short-time fluctuation phenomena caused by the starting current impact problem of the motor load and the sudden load increase and decrease in the production process, the setting of the starting detection delay parameter and the setting of the overload protection delay parameter can be provided, so that the load is protected more intelligently and reasonably, and the misoperation condition possibly occurring in a passive protection mode is avoided;
s10, setting an operation flag equal to 1;
s11, judging whether the absolute value of the difference between the first current parameter Iu and the second current parameter Iv is smaller than the maximum current deviation value A; if yes, the step S12 is entered, if not, the step S15 is entered;
s12, judging whether the average value Ic1 of the first current parameter (Iu) and the second current parameter (Iv) is larger than the overload protection current parameter value Ici; if yes, the step S13 is entered, if not, the step S18 is entered;
s13, starting a second detection delay timer, and calculating a second real-time delay time T2;
s14, judging whether the second detection delay timer T2 is larger than the overload protection delay time parameter value Terr; if yes, the step S15 is entered, if not, the step S18 is entered;
s15, outputting a fault protection instruction Sout which controls an output protection unit to execute protection behaviors;
s16, displaying fault information Err on the display screen;
s17, judging whether an external reset KEY signal exists (namely judging whether the signal of the external reset KEY is equal to zero), if so, returning to the step S1; if not, returning to the step S15;
and S18, displaying the real-time current value on the display screen, and returning to the step S2.
Referring to fig. 2, fig. 2 discloses an on-line intelligent monitoring protection system for an ac load, which includes:
the power conversion unit acquires primary electric energy from an external power supply and converts the primary electric energy into a power supply with stable voltage required by each unit;
the key display unit is used for inputting instructions to the CPU processing unit and displaying output information of the CPU processing unit;
the load current detection unit acquires a voltage value V1 of the first current analog quantity and a voltage value V2 of the second current analog quantity, and sends the voltage value V1 of the first current analog quantity and the voltage value V2 of the second current analog quantity to the analog IO port of the CPU processing unit;
the CPU processing unit is responsible for receiving the key information and the communication instruction of the upper computer, acquiring the load current information and analyzing and processing the load current information according to the logic set by the program; converting the analog quantity acquired by the load current detection unit into a current value, displaying the current value through a key/display unit, and outputting a fault protection instruction to an output protection unit when a fault occurs so as to execute a protection action; according to the communication instruction received by the serial port communication unit, corresponding data are returned to the upper computer after being analyzed;
the serial port communication unit is used for communicating information between the load CPU processing unit and an external upper computer and integrating monitoring and protecting systems of different devices into a network capable of being managed in a centralized manner;
the load starting signal unit is used for sending a load starting signal input from the outside to the CPU processing unit;
the parameter setting unit is used for carrying out normalization on the protection current parameter to be set and the starting delay and protection delay parameters through analog quantity values and inputting the parameters to the CPU processing unit;
and the output protection unit is responsible for executing the protection instruction sent by the CPU processing unit.
When the invention is used for carrying out online intelligent monitoring on the electroplating line, the invention can also be applied to monitoring and protecting the vibration motors on the electroplating line, according to the requirements of the electroplating process of the PCB, a plurality of vibration motors are arranged on one electroplating line, whether each motor is in normal work or not is very important for the quality of the PCB, once individual abnormal vibration occurs in production, serious quality defects can be caused to the batch of products, and larger economic loss is generated, therefore, by using the monitoring protector, each motor of the whole production line can be monitored and protected in real time through a network system.
Preferably, the key display unit is composed of a key device and an LED digital display component.
Preferably, the load current detection unit is composed of two sets of transformers and signal rectification filter circuits, wherein the transformers and the signal rectification filter circuits take the annular magnetic cores as cores.
Preferably, the CPU processing unit is composed of a single chip microcomputer and a peripheral circuit thereof.
Preferably, the serial port communication unit is composed of a 485 communication chip and a peripheral circuit thereof.
Preferably, the parameter setting unit is composed of three external adjustable analog potentiometers.
Preferably, the output protection unit is composed of a small relay circuit, and provides a group of normally open or normally closed contact outputs according to requirements; the relay output can be applied in industrial fields, and not only can drive weak current signals to an upper computer or other equipment, but also can directly drive a strong current protection switch and the like.
In the invention, the acquisition of the first path of current analog quantity I1 and the second path of current analog quantity I2 in the step S2 is acquired by utilizing a transformer principle. Specifically, a detection coil is wound on a square magnetic core formed by laminating silicon steel sheets or a circular magnetic core made of ferrite materials, and a load power line to be detected only needs to pass through the magnetic core ring during detection. The detection coil sends the sensed load current into the detection circuit and converts the load current into a voltage analog quantity V with a corresponding proportion; the detection circuit comprises a rectifying circuit formed by a diode and a voltage division circuit formed by a resistor.
By adopting the method to sample the current, the cost can be reduced to the maximum extent, expensive materials such as a Hall chip and the like are avoided, different winding turn ratios can be selected according to the size of a target load to be sampled, and the sampling requirements of loads with different specifications can be flexibly met.
The working principle of the invention is as follows: setting a starting delay time analog quantity Von, an overload protection voltage analog quantity Vci and an overload delay time analog quantity Verr through three analog potentiometers of the parameter setting unit, and respectively converting the starting delay time analog quantity Von, the overload protection voltage analog quantity Vci and the overload delay time Terr into representation through a CPU (namely converting the starting delay time analog quantity Von, the overload protection voltage analog quantity Vci and the overload delay time analog quantity Verr with a comparison table of the starting delay time Ton, the overload protection current value Ici and the overload delay time Terr according to a preset comparison table); the load current detection unit samples the first path of voltage analog quantity V1 and the second path of voltage analog quantity V2 in real time, and calculates and converts the first path of current parameter Iu and the second path of current parameter Iv representing the actual current magnitude, once the system detects that the started start delay time voltage analog quantity Von is effective, the system starts to enter the normal detection stage of the load, in order to avoid the error judgment of the normal current impact at the moment of load starting, the invention adopts the function of increasing start delay detection, the timer starts the first detection delay timer after receiving the start delay time voltage analog quantity Von starting signal, and calculates the first real time delay time T1, when the first real time delay time T1 is larger than the start delay time voltage analog quantity Von set by the parameter setting unit, the two paths of sampled load current are started, and the current of one path of load is detected simultaneously, whether the system works normally can be determined by whether two-phase currents of the same load are balanced, when the deviation of the first current parameter Iu and the second current parameter Iv is larger than a maximum current deviation value A allowed by the load and possibly caused by error factors such as inconsistent accuracy of a sensor or/and a conversion circuit device, namely | Iu-Iv | > A, the load is considered to be in a fault, a program sends a fault instruction error instruction Sout, and an Err prompt is displayed through an LED display screen. The maximum current deviation value A depends on the accuracy of the sensor and the accuracy of the conversion circuit device, and the accuracy of the maximum error in all the devices is obtained by integrating all the factors. And the deviation of the two-phase current of the load is smaller, when the value of | Iu-Iv | < A in the reasonable range of the system, the program further judges whether the values of a first current parameter Iu and a second current parameter Iv of the current in the circuit exceed the overload protection current parameter value Ici set by the overload current value in the parameter setting unit, if the overload protection current parameter value Ici is exceeded, a second detection delay timer is started, and a second real-time delay time T2 is calculated, if the load current is continuously greater than the set overload protection current parameter value Ici, the second real-time delay time T2 exceeds the overload delay time Terr of the parameter setting unit, namely T2> Terr, the system sends out a fault instruction Sout and displays Err prompt through an LED display screen, the program is reset to the initial state until an external reset key appears, and the detection and judgment are circulated again. And if the load current is smaller than the overload current set value Ici, the system displays the current magnitude in real time through the LED display screen, and continuously detects the load current and external set parameters in a circulating manner, and compares whether the current magnitude is overloaded or unbalanced until the current magnitude is abnormal to enter the same fault processing stage.
The invention also provides an online intelligent monitoring protection device of the alternating current load, which comprises a central processing unit and a memory connected with the central processing unit, wherein the memory stores a computer program, and the computer program is used for realizing the online intelligent monitoring protection method of the alternating current load when being executed by the central processing unit.
The invention also provides a storage medium, which is characterized in that the storage medium stores a computer program, and the computer program can be executed to realize the online intelligent monitoring protection method for the alternating current load.
Various equivalent changes made by applying the contents of the specification and the drawings are included in the scope of the claims of the invention without departing from the idea of the invention.
Claims (10)
1. An online intelligent monitoring protection method for an alternating current load is characterized by comprising the following steps:
s1, initializing parameters, and setting the operation flag = 0; including a maximum current deviation value (A) allowed by the load due to error factors of the sensor and/or the conversion circuit device;
s2, acquiring a voltage value V1 of the first current analog quantity and a voltage value V2 of the second current analog quantity of the load in real time;
s3, converting the voltage value (V1) of the first path of current analog quantity and the voltage value (V2) of the second path of current analog quantity into a first current parameter (Iu) and a second current parameter (Iv) representing the actual current magnitude by the CPU processing unit;
s4, respectively setting input starting delay time analog quantity (Von), overload protection value analog quantity (Vci) and overload protection delay time analog quantity (Verr) through a parameter setting unit;
s5, converting the start delay time analog quantity (Von), the overload protection value analog quantity (Vci) and the overload protection delay time analog quantity (Verr) into a start delay time parameter value (Ton), an overload protection current parameter value (Ici) and an overload protection delay time parameter value (Terr) by the CPU processing unit respectively;
s6, judging whether the externally input load starting switch value (Vst) is effective or not; if yes, go to step S7; if not, returning to the step S2;
s7, judging whether the operation flag is equal to 0; if yes, the step S8 is entered, if no, the step S10 is entered;
s8, starting a first detection delay timer (T1);
s9, judging whether the first detection delay timer (T1) is larger than the starting delay time parameter value (Ton) or not; if yes, entering the step S10, and if not, keeping the step S9; so circulating until the first detection delay timer (T1) is larger than the starting delay time parameter value (Ton);
s10, setting an operation flag equal to 1;
s11, judging whether the absolute value of the difference between the first current parameter (Iu) and the second current parameter (Iv) is smaller than the maximum current deviation value (A); if yes, the step S12 is entered, if not, the step S15 is entered;
s12, judging whether the average value (Ic 1) of the first current parameter (Iu) and the second current parameter (Iv) is larger than the overload protection current parameter value (Ici); if yes, the step S13 is entered, if not, the step S18 is entered;
s13, starting a second detection delay timer (T2);
s14, judging whether the second detection delay timer (T2) is larger than the overload protection delay time parameter value (Terr) or not; if yes, the step S15 is entered, if not, the step S18 is entered;
s15, outputting a fault protection instruction (Sout) which controls an output protection unit to execute protection actions;
s16, displaying fault information (Err) on a display screen;
s17, judging whether an external reset Key (Key) signal exists or not, if so, returning to the step S1; if not, returning to the step S15;
and S18, displaying the real-time current value on the display screen, and returning to the step S2.
2. An on-line intelligent monitoring protection system for an alternating current load, comprising:
the power conversion unit acquires primary electric energy from an external power supply and converts the primary electric energy into a power supply with stable voltage required by each unit;
the key display unit is used for inputting instructions to the CPU processing unit and displaying output information of the CPU processing unit;
the load current detection unit acquires a voltage value of the first current analog quantity and a voltage value of the second current analog quantity and transmits the voltage values of the first current analog quantity and the second current analog quantity to an analog IO port of the CPU processing unit;
the CPU processing unit is responsible for receiving the key information and the communication instruction of the upper computer, acquiring the load current information and analyzing and processing the load current information according to the logic set by the program; converting the analog quantity acquired by the load current detection unit into a current value, displaying the current value through a key/display unit, and outputting a fault protection instruction to an output protection unit when a fault occurs so as to execute a protection action; according to the communication instruction received by the serial port communication unit, corresponding data are returned to the upper computer after being analyzed;
the serial port communication unit is used for communicating information between the load CPU processing unit and an external upper computer and integrating monitoring and protecting systems of different devices into a network capable of being managed in a centralized manner;
a load starting signal unit for sending the starting signal of the load input from the outside to the CPU processing unit;
the parameter setting unit is used for carrying out normalization on the protection current parameter to be set and the starting delay and protection delay parameters through analog quantity values and inputting the parameters to the CPU processing unit;
and the output protection unit is responsible for executing the protection instruction sent by the CPU processing unit.
3. The on-line intelligent monitoring and protection system for the alternating current load according to claim 1, wherein: the key display unit is composed of a key device and an LED digital display component.
4. An on-line intelligent monitoring and protection system for an alternating current load according to claim 1 or 2, characterized in that: the load current detection unit is composed of two groups of mutual inductors taking the annular magnetic core as a core and a signal rectification filter circuit.
5. An on-line intelligent monitoring and protection system for an alternating current load according to claim 1 or 2, characterized in that: the CPU processing unit is composed of a single chip microcomputer and a peripheral circuit thereof.
6. An on-line intelligent monitoring and protection system for an alternating current load according to claim 1 or 2, characterized in that: the serial port communication unit is composed of a 485 communication chip and a peripheral circuit thereof.
7. An on-line intelligent monitoring and protection system for an alternating current load according to claim 1 or 2, characterized in that: the parameter setting unit is composed of three external adjustable analog potentiometers.
8. An on-line intelligent monitoring and protection system for an alternating current load according to claim 1 or 2, characterized in that: the output protection unit is composed of a small relay circuit and provides a group of normally open or normally closed contact outputs according to requirements.
9. An online intelligent monitoring and protecting device for an alternating current load, which comprises a central processing unit and a memory connected with the central processing unit, wherein the memory stores a computer program, and the computer program is used for realizing the online intelligent monitoring and protecting method for the alternating current load according to claim 1 when being executed by the central processing unit.
10. A storage medium, characterized in that it stores a computer program executable for implementing the method for online intelligent monitoring protection of an alternating current load according to claim 1.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201352706Y (en) * | 2008-12-05 | 2009-11-25 | 无锡机电高等职业技术学校 | Digital multifunctional motor protector |
| CN201789274U (en) * | 2010-09-16 | 2011-04-06 | 苍南盛泰电子科技有限公司 | Intelligent monitor protective device of motor |
| CN102790378A (en) * | 2011-05-20 | 2012-11-21 | 上海宝钢化工有限公司 | Intelligent motor protector and protection method thereof |
| CN104377654A (en) * | 2014-11-20 | 2015-02-25 | 安徽江河技术有限公司 | Motor running protecting method based on DSP embedded motor protector |
| CN108807101A (en) * | 2018-06-19 | 2018-11-13 | 李秀才 | The breaker of tracking load variation automatic adjusting rated value |
| CN111413562A (en) * | 2020-03-31 | 2020-07-14 | 广东中鹏电气有限公司 | Monitoring and control method for high-overload transformer system |
| CN113270849A (en) * | 2021-05-18 | 2021-08-17 | 鲁西工业装备有限公司 | Low-voltage protection calibration device and calibration method |
-
2021
- 2021-10-13 CN CN202111194421.9A patent/CN113922504A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201352706Y (en) * | 2008-12-05 | 2009-11-25 | 无锡机电高等职业技术学校 | Digital multifunctional motor protector |
| CN201789274U (en) * | 2010-09-16 | 2011-04-06 | 苍南盛泰电子科技有限公司 | Intelligent monitor protective device of motor |
| CN102790378A (en) * | 2011-05-20 | 2012-11-21 | 上海宝钢化工有限公司 | Intelligent motor protector and protection method thereof |
| CN104377654A (en) * | 2014-11-20 | 2015-02-25 | 安徽江河技术有限公司 | Motor running protecting method based on DSP embedded motor protector |
| CN108807101A (en) * | 2018-06-19 | 2018-11-13 | 李秀才 | The breaker of tracking load variation automatic adjusting rated value |
| CN111413562A (en) * | 2020-03-31 | 2020-07-14 | 广东中鹏电气有限公司 | Monitoring and control method for high-overload transformer system |
| CN113270849A (en) * | 2021-05-18 | 2021-08-17 | 鲁西工业装备有限公司 | Low-voltage protection calibration device and calibration method |
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