CN111665401A - Assembled low-voltage Internet of things intelligent monitoring system - Google Patents
Assembled low-voltage Internet of things intelligent monitoring system Download PDFInfo
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- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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Abstract
The invention provides a split mounting type Internet of things low-voltage intelligent monitoring system, and belongs to the technical field of Internet of things low-voltage monitoring. The intelligent detection system comprises a signal acquisition module, a microprocessor, a key setting module, a display module, a pluggable wireless communication module, a wired communication interface and an alarm module, wherein the microprocessor compares the acquired voltage, current and residual current with corresponding reference values and judges whether an alternating current circuit has a fault or not; and comparing the acquired voltage, current and residual current with corresponding reference early warning values on the cloud platform, and judging whether the circuit has early warning, wherein the reference values and the reference early warning values can be modified on a key setting module or the cloud platform on line or off line. Compared with the existing Internet of things low-voltage intelligent monitoring system, the reference value can be adjusted according to the change of the circuit, and the circuit early warning or fault information can be sent to the intelligent terminal of a maintainer in real time.
Description
Technical Field
The invention relates to the technical field of low-voltage monitoring of Internet of things, in particular to an intelligent monitoring system of an assembled low-voltage Internet of things.
Background
Along with the maturity of low-voltage distribution technology, the user has proposed higher and higher requirement to low-voltage distribution equipment's reliability, security and convenience, and individualized customization product even, along with the gradual maturity of internet of things, apply to the new requirement that reliability, security and convenience that the user provided to low-voltage distribution equipment can be satisfied better with internet of things to low-voltage distribution equipment with the application of internet of things.
Chinese patent CN201920768905.1 discloses an thing networking low pressure intelligence circuit breaker and thing networking system thereof, the circuit breaker includes data acquisition module, intelligent processing module, the control module that closes and divides, and thing networking communication module, data acquisition module is arranged in gathering the voltage in the circuit, the electric current, the temperature parameter of residual current and business turn over line tie point, and send to intelligent processing module with the digital quantity form, intelligent processing module carries out operation and comparison to the running parameter value that receives, with judge whether overcurrent appears in the circuit, the short circuit, the electric leakage, temperature fault, and to closing and dividing control module transmission closing and dividing brake control instruction, close and dividing brake with control circuit breaker switch, intelligent processing module passes through thing networking communication module and distribution transformer monitor terminal, accomplish remote data acquisition and control circuit breaker remote closing and dividing brake. The intelligent circuit breaker is used for further upgrading the intellectualization of the traditional mechanical circuit breaker, can realize internet of things communication, does not need wiring, and is favorable for the internet of things of a low-voltage distribution network. However, the scheme also has the defects that zero-missing and phase-missing faults of the circuit cannot be judged, and the reference voltage value, the reference current value and the reference residual current value cannot be locally or remotely modified.
Disclosure of Invention
The invention aims to solve the problems and provides an assembled low-voltage Internet of things intelligent monitoring system.
In order to achieve the purpose, the invention adopts the following technical scheme:
an assembled low-voltage Internet of things intelligent monitoring system comprises an intelligent detection system, a cloud platform and an intelligent terminal, wherein the intelligent detection system comprises a signal acquisition module, a microprocessor, a key setting module, a display module, a pluggable wireless communication module, a wired communication interface and an alarm module, the signal acquisition module, the key setting module, the display module, the pluggable wireless communication module, the wired communication interface and the alarm module are all electrically connected with the microprocessor, the pluggable wireless communication module and the cloud platform are in wireless connection, and the cloud platform is in wireless connection with the intelligent terminal; the signal acquisition module transmits acquired voltage, current and residual current signals of the three-phase circuit of each phase to the metering chip, the metering chip is electrically connected with the isolation chip, the isolation chip is electrically connected with the microprocessor, and the microprocessor compares the received voltage signals, current signals and residual current signals with a reference voltage value, a reference current value and a reference residual current value respectively to judge whether the circuit has faults or not, wherein the faults comprise abnormal voltage faults, abnormal current faults and residual current faults; the collected current signals and voltage signals are analyzed, whether zero-missing or phase-missing faults occur in the alternating current circuit or not is judged, when the faults occur in the circuit, the microprocessor sends control signals to the wired communication interface from the RS485 interface, and when the circuit fails, the microprocessor sends the control signals to the alarm module to give an alarm.
The circuit state information is sent to the display module by the microprocessor in real time, the display module displays the circuit state information in real time, meanwhile, the circuit state information is transmitted to the cloud platform by the microprocessor through the pluggable wireless communication module in a wireless mode, the cloud platform stores, screens, excavates, compares and analyzes received data, and the cloud platform transmits the circuit state information to the intelligent terminal in a wireless mode; the method comprises the steps that an intelligent terminal obtains circuit state information of an alternating current circuit from a cloud platform, the obtained circuit state information is displayed in real time, a reference voltage value, a reference current value or a reference residual current value is modified on the intelligent terminal, the modified reference voltage value, the modified reference current value or the modified reference residual current value is transmitted to the cloud platform by the intelligent terminal, a microprocessor periodically polls the cloud platform to obtain the modified reference value, the reference voltage value, the reference current value or the reference residual current value is modified on line in real time, received voltage signals, current signals and residual current signals are compared with the reference voltage early warning value, the reference current early warning value and the reference residual current early warning value respectively on the cloud platform to judge whether the alternating current circuit has early warning, and the early warning comprises voltage abnormity early warning, current abnormity early warning and residual current abnormity early warning.
In foretell but in pin-connected panel low pressure thing networking intelligent monitoring system, the signal acquisition module still includes microprocessor, keeps apart the chip, measurement chip and one cup joints three phase lines and a zero line outlet end and with measurement chip electric connection's residual current sensor to and three cup joint respectively on single phase line and through sampling resistor and filter circuit and measurement chip electric connection's A looks electric quantity sensor, B looks electric quantity sensor and C looks electric quantity sensor, the isolation chip is connected to measurement chip electricity, keep apart the microprocessor electric connection of chip and intellectual detection system, microprocessor measures A looks, B looks and C looks real-time voltage, the electric current and the residual current of main circuit respectively.
In foretell but in pin-connected panel low pressure thing networking intelligent monitoring system, but plug wireless communication module includes 4G communication module or 5G communication module, but 4G communication module, 5G communication module or wiFi module alternative and plug wireless communication module interface plug electricity are connected, power module provides the power for signal acquisition module, microprocessor, button setting module, display module, but plug wireless communication module, wired communication interface and alarm module.
In foretell but in pin-connected panel low pressure thing networking intelligent monitoring system, display module and microprocessor electric connection, microprocessor convey the display module and show with each looks voltage and current of alternating current circuit, the residual current signal of main circuit and the fault state information of circuit in real time, and when alternating current circuit broke down, display module screen brightness intermittent type, improve and reduce alternately.
In foretell but in pin-connected panel low pressure thing networking intelligent monitoring system, alarm module includes bee calling organ and alarm signal lamp, and during fault condition, microprocessor sends alarm signal to bee calling organ and alarm signal lamp with alarm signal, sends sound and light signal respectively and reports to the police.
In the above assembling type low-voltage internet of things intelligent monitoring system, the key setting module is electrically connected with the microprocessor, and the reference voltage value, the reference current value and the reference residual current value are modified through the key setting module.
In the above intelligent monitoring system for the assembled low-voltage internet of things, the circuit state information includes real-time voltage values and real-time current values of phases of the alternating-current circuit, real-time residual current values, early warning information, time of occurrence of early warning, fault information and time of occurrence of faults of the main circuit.
Compared with the prior art, the invention has the advantages that:
1. the utility model provides a but pin-connected panel low pressure thing networking intelligent monitoring system compares in current voltage detection system, carries out analysis and calculation with the voltage signal that signal acquisition module gathered, and the real-time voltage and the current value of each phase of analysis can judge that three phase circuit exists and lacks zero or lack the looks trouble.
2. The reference voltage value, the reference current value and the reference residual current value support local modification, and the modification can also be performed remotely on the intelligent terminal 3. Local modification: the key module is electrically connected with the microprocessor module, the microprocessor module receives key signals and respectively enters a modification menu of voltage, current and residual current, the modification of the reference voltage value, the reference current value and the reference residual current value can be completed by modifying the corresponding reference values, the reference voltage value, the reference current value and the reference residual current value are set to be in a modifiable mode, the detected alternating current circuit can be favorably modified in time, and the power utilization is safer and more reliable.
3. The communication mode of the Internet of things adopts a pluggable wireless communication module, and on a wireless communication interface, 4G and 5G are alternatively installed in a pluggable manner, so that diversification of user requirements can be met.
4. The detection system and the actuating mechanism are not arranged in the same device, the situation that the current-carrying capacity is not high due to the limitation of electromagnetic interference and electrical specifications is avoided, and the highest current-carrying capacity of the detection system can reach 125A.
5. The fault judgment is carried out on the microprocessor, the program quantity of the microprocessor is reduced, early warning judgment is carried out on the cloud platform, if the circuit has early warning, the cloud platform sends the position of an early warning circuit, specifically which kind of early warning information to maintenance personnel, the alternating current circuit is guaranteed to be maintained before the circuit fault occurs, the probability of avoiding the fault occurrence is achieved, meanwhile, the cloud platform also sends the early warning information to the display module, and the early warning information is displayed on the screen of the display module.
Drawings
FIG. 1 is a schematic diagram of the appearance of a low-voltage Internet of things intelligent monitoring device;
FIG. 2 is a schematic diagram of a control system;
FIG. 3 is a schematic circuit diagram of an information collection module;
in the figure, the intelligent detection system 1, the cloud platform 2, the intelligent terminal 3, the signal acquisition module 4, the microprocessor 5, the button sets up module 6, display module 7, but plug wireless communication module 8, wired communication interface 9, alarm module 10, a looks electric quantity sensor 12, B looks electric quantity sensor 13, C looks electric quantity sensor 14, measurement chip 15, keep apart chip 16, bee calling organ 17, alarm signal lamp 18, 1# sampling resistor 19, power module 19a, 1# resistance 20, 1# electric capacity 21, residual current sensor 21a, 2# sampling resistor 22, 2# resistance 23, 2# electric capacity 24.
Detailed Description
As shown in fig. 1 to 3, a detachable low-voltage internet of things intelligent monitoring system comprises a signal acquisition module 4, a microprocessor module 5, a key setting module 6, a display module 7, a pluggable wireless communication module 8, a wired communication interface 9, a cloud platform 2, an alarm module 10 and a power module 19a, wherein the signal acquisition module 4, the key setting module 6, the display module 7, the pluggable wireless communication module 8, the wired communication interface 9 and the alarm module 10 are all electrically connected with the microprocessor module 5, and the pluggable wireless communication module 8 is wirelessly connected with the cloud platform 2; the signal acquisition module 4 transmits the acquired voltage, current and main circuit residual current signals of each phase to the microprocessor module 5, and the microprocessor module 5 compares the received voltage signals, current signals and residual current signals with a voltage reference value, a current reference value and a reference residual current value respectively to judge whether the circuit has voltage abnormality, current abnormality or leakage fault; analyzing the acquired current signal and voltage signal, judging whether a three-phase circuit has a zero-missing or phase-missing fault, when the circuit has the fault, sending a control signal to the wired communication interface 9 from the RS485 interface by the microprocessor module 5, and sending the control signal to the alarm module 10 by the microprocessor module 5 to alarm; under the normal and fault states of the circuit, the microprocessor module 5 sends the circuit state information to the display module 7 in real time and transmits the circuit state information to the cloud platform 2 through the pluggable wireless communication module 8, the display module 7 displays the circuit state in real time, the cloud platform 2 is in wireless connection with the intelligent terminal 33, and the cloud platform 2 stores, screens, excavates, compares and analyzes the received data; the intelligent terminal 3 reads the state information of the alternating current circuit from the cloud platform 2, displays the acquired circuit state information in real time, modifies a voltage reference value, a current reference value or a reference residual current value on the intelligent terminal 3, transmits the modified reference voltage value, reference current value or reference residual current value to the cloud platform 2 through the intelligent terminal 3, and the microprocessor module 5 periodically polls the cloud platform 2 to acquire the modified reference value and modifies the reference voltage value, reference current value or reference residual current value on line in real time, so that the real-time monitoring and analysis of the voltage, the current and the residual current of the three-phase circuit are realized, and the safety and the reliability of power utilization are improved.
In the prior art, a detection system and an execution system are integrated, and the current-carrying capacity of the detection and execution integrated device cannot exceed 65A due to the limitation of volume and electrical specification; the detection system does not have the function of judging zero or phase lack of the three-phase circuit; the reference voltage value, the reference current value and the reference residual current value, which are used as the basis for judging whether the circuit has a fault, do not support the local and/or remote modification function, and when the load of the detected circuit is changed, the safety parameters cannot be effectively changed, so that the safety risk of power utilization can be possibly caused; the traditional detection device has the advantages that the circuits are all designed on one circuit board, so that the volume of a product is large, and the mass production efficiency and the yield of the product are limited; due to the defects, the popularization and mass production efficiency of the product is limited.
In the embodiment, the signal acquisition module 4, the microprocessor module 5, the key setting module 6, the display module 7, the pluggable wireless communication module 8, the wired communication interface 9, the alarm module 10 and the power module 19a are all produced independently, and only welding or connector connection is needed to be carried out on each module during assembly, so that the production efficiency and the yield are greatly improved; the scheme of independent design of each module is more favorable for accelerating the research and development progress of projects and is favorable for large-scale production of the detection system.
This detecting system does not include the actuating system, the advantage of separating detecting system and actuating system can improve detecting system's current-carrying capacity, when concentrating detecting system and actuating system in same device, because volume and electric standard's restriction, lead to the current-carrying capacity of whole equipment can not exceed 65A, and adopt the mode with detecting system and actuating system separation, then detecting system's current-carrying capacity can reach 125A, has improved detecting system's range of application greatly, has improved detecting system's market prospect.
In the scheme, the voltage abnormity early warning comprises an overvoltage early warning and an undervoltage early warning; current abnormity early warning, namely overcurrent early warning; residual current abnormity early warning, namely residual current early warning; the voltage abnormal faults comprise overvoltage faults and undervoltage faults; a current abnormality fault is an overcurrent fault.
It should be noted that the reference voltage value includes a reference upper limit voltage value, a reference lower limit voltage value, a single-phase reference upper limit voltage value and a single-phase reference lower limit voltage value, a reference upper limit voltage early warning value, a reference lower limit voltage early warning value, a single-phase reference upper limit voltage early warning value and a single-phase reference lower limit voltage early warning value; the reference current value comprises a reference upper limit current value and a single-phase reference upper limit current value, a reference upper limit current early warning value and a single-phase reference current early warning value, and the reference residual current value also comprises a residual current early warning value; the reference values can be modified locally or remotely on the cloud platform 2 or through the key setting module 6, and all the modified reference values and the modified time need to be stored in the cloud platform 2.
The metering chip 15 of the scheme adopts but is not limited to a three-phase alternating current and direct current electric energy metering chip, the chip can measure the effective values of the voltage and the current of the three-phase full-wave circuit according to signals collected by an electric quantity sensor and filtered by a sampling resistor, and the chip can also provide the real-time measurement function and the electric quantity metering function of the reactive power of the three-phase full-wave circuit.
As shown in fig. 3, three phases A, B and C are respectively sleeved with three electric quantity sensors, and a residual current sensor 21a is sleeved outside a three-phase circuit and a zero line outlet end, as exemplified by phase a, and embodiments of phase B, phase C and residual current detection circuits are similar to phase a.
The detection circuit of the electric quantity sensor 12 of the phase A is provided with a symmetrical circuit for realizing an alternating current signal induced by the electric quantity sensor 12, the electric quantity sensor 12 is electrically connected with one end of a 1# sampling resistor 19 and one end of a 1# resistor 20, the other end of the 1# sampling resistor 19 is electrically connected with a 1# capacitor 21 and a metering chip 15, and the other ends of the 1# resistor 20 and the 1# capacitor 21 are grounded; the electric quantity sensor 12 is electrically connected with one ends of a 2# sampling resistor 22 and a 2# resistor 23, the other end of the 2# sampling resistor 22 is electrically connected with a 2# capacitor 24 and the metering chip 15, and the other ends of the 2# resistor 23 and the 2# capacitor 24 are grounded; therefore, when the electric quantity sensor 12 senses an alternating current signal, the alternating current signal can be accurately transmitted to the metering chip 15 by the circuit for measurement and calculation, and the reactive power of the circuit can be measured according to the circuit.
The metering chip 15 is electrically connected with the isolation chip 16, the isolation chip 16 is electrically connected with the microprocessor module 5, and the microprocessor module 5 obtains the current and the voltage of the A phase, the B phase and the C phase measured by the metering chip 15 and the residual current of the main circuit.
When the phase currents of the three-phase circuit are detected and judged, the judgment needs to be respectively carried out according to the types of the accessed loads, the selection of the load types can be respectively carried out on the key setting module 6 or the intelligent terminal 3, whether the loads accessed into the detection circuit are three-phase loads or single-phase loads is selected, and the default of the detection system is a three-phase fault detection mode.
When the detection system is connected with a three-phase load, whether the current mode is the three-phase fault detection mode is determined by the key setting module 6 or the intelligent terminal 3, and if not, the mode needs to be modified into the three-phase fault detection mode. In the microprocessor 5, the following determination is made:
if the voltage of any one of the three phases of the phase A, the phase B and the phase C is greater than the reference upper limit voltage value, the alternating current circuit has overvoltage faults; and if the voltage of any one of the three phases of the A phase, the B phase and the C phase is less than the reference lower limit voltage value, the AC circuit has undervoltage fault.
And if the current of any one of the three phases of the A phase, the B phase and the C phase is larger than the reference upper limit current value, the AC circuit has overcurrent fault.
If the residual current measured by the microprocessor module 5 is greater than the reference residual current value, a residual current fault occurs in the ac circuit, and the risk of electric leakage may have occurred.
If the voltage of any one of the A phase, the B phase and the C phase is less than 10 volts, and the voltage of other phases is more than 100 volts, a phase-missing fault occurs in the three-phase alternating-current circuit.
If the current of any one of the A phase, the B phase and the C phase is less than 0.05A, and the current of the other phases is more than 0.2A, the three-phase circuit has a zero-lack fault.
When one phase or multiple phases of the three-phase circuit are only connected to a single-phase load, firstly, the fault judgment mode needs to be set to be a single-phase fault detection mode in the key setting module 6 or the intelligent terminal 3, and the microprocessor module 5 compares the measured currents of the A phase, the B phase and the C phase with a single-phase reference upper limit current value.
And if the voltage of any one of the three phases of the phase A, the phase B and the phase C is greater than the single-phase reference upper limit voltage value, the phase has overvoltage fault.
And if the voltage of any one of the three phases of the phase A, the phase B and the phase C is smaller than the single-phase reference lower limit voltage value, the phase has undervoltage fault.
If the current of any one of the three phases of the phase A, the phase B and the phase C is larger than the single-phase reference current value, the single-phase circuit has overcurrent fault.
The reference voltage value, the reference current value and the reference residual current value are all supported to be modified on the intelligent terminal 3 or the key setting module 6 in an online or offline mode, the reference value is determined according to a load connected to the alternating current circuit and a load connection mode, and the reference upper limit voltage value is 116% -120% of the rated voltage of the three-phase circuit where the reference upper limit voltage value is located; the reference lower limit voltage value is 80-82% of the rated voltage of the three-phase circuit; 116% -120% of rated voltage of the single-phase circuit where the single-phase reference upper limit voltage value is located and the single-phase reference lower limit voltage value; the single-phase reference lower limit voltage value is 80% -85% of the rated voltage of the single-phase circuit.
The reference upper limit current value is 106% -110% of the rated current of the three-phase circuit; the single-phase reference upper limit current value is 106% -110% of rated current of the single-phase circuit.
When the load and the connection mode of the load are determined, the reference value needs to be modified according to the actual situation, so that the electricity utilization safety is ensured.
A phase A, a phase B, a phase C and a zero line are sleeved with a residual current sensor 21a together in a non-contact mode at a wire outlet end, signals of the residual current sensor 21a are filtered through a # 1 sampling resistor 21 and an RC respectively and are connected into a metering chip 15, the metering chip 15 is electrically connected with an isolation chip 16, the isolation chip 16 is electrically connected with a microprocessor module 5, signals of the residual current sensor 21a are transmitted into the microprocessor module 5, the microprocessor module 5 compares the measured residual current value with a reference residual current value, and if the residual current value is larger than the reference residual current value, residual current faults occur in a three-phase circuit, namely leakage faults occur.
The reference residual current value of the detection system supports a local modification mode performed at the key setting module 6 and a remote modification mode performed at the intelligent terminal 3. When the number of the electrical appliances accessed to the circuit where the detection system is located is large, the residual currents of the electrical appliances are accumulated together and often exceed the reference residual current value set by the detection system, so that false alarm of the detection system and false operation of the execution system are caused, and adverse effects are caused to normal electricity consumption.
When the three-phase circuit has overvoltage, undervoltage, overcurrent, phase loss or zero loss faults, the microprocessor module 5 sends corresponding control signals to the wired communication interface 9 through the RS485 interface, the wired communication interface 9 is electrically connected with the execution system, so that the execution system is controlled to execute the control signals sent by the microprocessor module 5, meanwhile, the microprocessor module 5 sends alarm signals to the display module 7, the alarm module 10 and the cloud platform 2 in real time, the display module 7 displays the voltage, the current, the residual current real-time value and the fault information of the three-phase circuit in real time, and the brightness of a display screen of the display module 7 is intermittently and alternately increased and decreased; when receiving the fault signal sent by the microprocessor module 5, the alarm module 10 sends a sound signal to give an alarm to remind a maintainer of maintaining in time.
When the three-phase circuit has overvoltage, undervoltage, overcurrent, residual current fault (electric leakage), phase loss or zero loss fault, the microprocessor module 5 sends an instruction for controlling the actuating mechanism to open the circuit breaker to the wired communication interface 9, and the actuating mechanism opens the circuit breaker in a differential mode; meanwhile, the processor module 5 transmits the fault information to the cloud platform 2 in real time through the pluggable wireless communication module 8, and then transmits the fault information to the intelligent terminal 3 through the cloud platform 2.
The microprocessor module 5 is electrically connected with the pluggable wireless communication module 8, the pluggable wireless communication module 8 is wirelessly connected with the cloud platform 2, the pluggable wireless communication module 8 and the cloud platform 2 can perform bidirectional data exchange, and the three-phase voltage, the current and the residual current collected by the microprocessor module 5, and the fault information of the three-phase circuit and the time of the fault occurrence are transmitted to the cloud platform 2 in a wireless manner through the pluggable wireless communication module 8, the cloud platform 2 stores the state information (three-phase voltage, current and residual current measured values) and the fault information of the three-phase circuit transmitted through the pluggable wireless communication module 8, and stores the information of the three-phase circuit and the fault occurrence time of the three-phase circuit, particularly the fault information of the circuit and the modification and modification time of the various reference values are required to be stored in the cloud platform 2.
The cloud platform 2 screens the stored data, screens, analyzes and excavates the measured values of current, voltage and residual current, and compares the real-time voltage, current and residual current transmitted by the microprocessor 5 through the pluggable wireless communication module 8 in a wireless mode with corresponding early warning values respectively on the cloud platform 2 to judge whether the alternating current circuit generates early warning.
In the cloud platform 2, when a circuit electrically connected with the microprocessor 5 is connected with a three-phase load, if the voltage of any one of the three phases of the A phase, the B phase and the C phase is greater than a reference upper limit voltage early warning value and less than the reference upper limit voltage value, the overvoltage early warning is judged; if the voltage of any one of the three phases of the phase A, the phase B and the phase C is greater than the reference lower limit voltage value and less than the reference lower limit voltage early warning value, judging that the voltage is under-voltage early warning; if the current of any one of the three phases of the phase A, the phase B and the phase C is greater than the reference upper limit current early warning value and less than the reference upper limit current value, judging that overcurrent early warning is carried out; and if the residual current measured by the microprocessor module 5 is greater than the reference residual current early warning value and less than the reference residual current value, judging that the residual current early warning is carried out.
In the cloud platform 2, when a circuit electrically connected with the microprocessor 5 is connected with a single-phase load, if the voltage of any one of the three phases, namely the phase A, the phase B and the phase C is greater than a single-phase reference upper limit voltage early warning value and less than the single-phase reference upper limit voltage value, the overvoltage early warning is judged; if the voltage of any one of the three phases of the phase A, the phase B and the phase C is greater than the single-phase reference lower limit voltage early warning value and is greater than the single-phase reference lower limit voltage value, judging that the voltage is under-voltage early warning; and if the current of any one of the three phases of the phase A, the phase B and the phase C is larger than the single-phase reference current early warning value and smaller than the single-phase reference current value, judging that the current is over-current early warning.
The reference voltage early warning value, the reference current early warning value and the reference residual current early warning value are all supported to be modified on line or off line at the intelligent terminal 3 or the key setting module 6, and the range of the early warning values is given as follows: the reference upper limit voltage early warning value is 110% -115% of the rated voltage of the three-phase circuit, and the reference lower limit voltage early warning value is 83% -85% of the rated voltage of the three-phase circuit; the single-phase reference upper limit voltage early warning value is 110% -115% of the rated voltage of the single-phase circuit, and the single-phase reference lower limit voltage early warning value is 83% -85% of the rated voltage of the three-phase circuit; the reference upper limit current early warning value is 102% -105% of the rated current of the three-phase circuit; the single-phase reference current early warning value is 102% -105% of rated current of the three-phase circuit; the reference residual current value is the maximum allowable residual current value of the AC circuit; the reference residual current early warning value is 85% -90% of the maximum allowable residual current value of the alternating current circuit.
When the cloud platform 2 judges that the detected circuit has voltage abnormity early warning, current abnormity early warning or residual current abnormity early warning, the cloud platform 2 sends the early warning information of the corresponding circuit to the intelligent terminal and the microprocessor module of the intelligent detection system 1, the circuit information of the early warning is pushed on the intelligent terminal, after the microprocessor module receives the early warning information, the circuit information of the early warning is displayed on the display module, when the early warning occurs, the microprocessor module does not send out a control signal to the interface of the wired communication module, but only prompts maintenance personnel to maintain in time, the reason for generating the early warning is eliminated, and the circuit fault occurrence caused by the fault generation is avoided.
The cloud platform 2 is composed of servers, which may be self-service servers owned by customers, leased servers, or servers of manufacturers.
The cloud platform 2 is wirelessly connected with the intelligent terminal 3, the wireless connection mode can be one of 4G, 5G or WiFi according to the circumstances, the cloud platform 2 and the intelligent terminal 3 can perform bidirectional data exchange, the state information and the fault information of the three-phase circuit acquired by the cloud platform 2 from the pluggable wireless communication module 8 are sent to the intelligent terminal 3 in a wireless mode, the state information and the fault information are displayed on the intelligent terminal 3, the reference voltage value, the reference current value and the reference residual current value can be modified on line on the intelligent terminal 3, the reference value is transmitted to the cloud platform 2 in a wireless mode after being modified, then the cloud platform 2 transmits the state information and the fault information to the pluggable wireless communication module 8 and finally transmits the state information and the fault information to the microprocessor module 5, the corresponding program of the microprocessor module 5 is modified on line, and the operation of remotely modifying the reference.
Although terms such as the smart detection system 1, the cloud platform 2, the smart terminal 3, the signal acquisition module 4, the microprocessor 5, the key setting module 6, the display module 7, the pluggable wireless communication module 8, the wired communication interface 9, the alarm module 10, the a-phase electric quantity sensor 12, the B-phase electric quantity sensor 13, the C-phase electric quantity sensor 14, the metering chip 15, the isolation chip 16, the buzzer 17, the alarm signal lamp 18, the 1# sampling resistor 19, the power supply module 19a, the 1# resistor 20, the 1# capacitor 21, the residual current sensor 21a, the 2# sampling resistor 22, the 2# resistor 23, and the 2# capacitor 24 are used more often, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (7)
1. The intelligent monitoring system is characterized by comprising an intelligent detection system (1), a cloud platform (2) and an intelligent terminal (3), wherein the intelligent detection system (1) comprises a signal acquisition module (4), a microprocessor (5), a key setting module (6), a display module (7), a pluggable wireless communication module (8), a wired communication interface (9) and an alarm module (10), the signal acquisition module (4), the key setting module (6), the display module (7), the pluggable wireless communication module (8), the wired communication interface (9) and the alarm module (10) are electrically connected with the microprocessor (5), the pluggable wireless communication module (8) is wirelessly connected with the cloud platform (2), and the cloud platform (2) is wirelessly connected with the intelligent terminal (3);
the signal acquisition module (4) transmits acquired voltage, current and three-phase circuit residual current signals of each phase to the metering chip (15), the metering chip (15) is electrically connected with the isolation chip (16), the isolation chip (16) is electrically connected with the microprocessor (5), the microprocessor (5) compares the received voltage signals, current signals and residual current signals with a reference voltage value, a reference current value and a reference residual current value respectively to judge whether the circuit has faults, wherein the faults comprise voltage abnormal faults, current abnormal faults and residual current faults; analyzing the acquired current signal and voltage signal, judging whether the alternating current circuit has zero-missing or phase-missing fault, when the circuit has the fault, the microprocessor (5) sends a control signal to the wired communication interface (9) from the RS485 interface, and when the circuit has the fault, the microprocessor (5) sends the control signal to the alarm module (10) to alarm;
the circuit state information is sent to the display module (7) by the microprocessor (5) in real time, the display module (7) displays the circuit state information in real time, meanwhile, the microprocessor (5) transmits the circuit state information to the cloud platform (2) in a wireless mode through the pluggable wireless communication module (8), the cloud platform (2) stores, screens, excavates, compares and analyzes received data, and the cloud platform (2) transmits the circuit state information to the intelligent terminal (3) in a wireless mode; the method comprises the steps that an intelligent terminal (3) obtains circuit state information of an alternating current circuit from a cloud platform (2), the obtained circuit state information is displayed in real time, a reference voltage value, a reference current value or a reference residual current value is modified on the intelligent terminal (3), the modified reference voltage value, the reference current value or the reference residual current value is transmitted to the cloud platform (2) through the intelligent terminal (3), a microprocessor (5) periodically polls the cloud platform (2) to obtain the modified reference value, the reference voltage value, the reference current value or the reference residual current value is modified on line in real time, received voltage signals, current signals and residual current signals are compared with the reference voltage early warning value, the reference current early warning value and the reference residual current early warning value respectively on the cloud platform (2) to judge whether the alternating current circuit has early warning, and the early warning comprises voltage abnormity early warning, voltage and residual current warning, And current abnormity early warning and residual current abnormity early warning.
2. The assembly type low-voltage Internet of things intelligent monitoring system according to claim 1, wherein the signal acquisition module (4) further comprises a microprocessor (5), an isolation chip (16), a metering chip (15), a residual current sensor (21a) which is sleeved at the outlet ends of three phase lines and a zero line and electrically connected with the metering chip (15), and three A-phase electric quantity sensors (12), B-phase electric quantity sensors (13) and C-phase electric quantity sensors (14) which are respectively sleeved on a single phase line and electrically connected with the metering chip (15) through sampling resistors and filter circuits, the metering chip (15) is electrically connected with the isolation chip (16), the isolation chip (16) is electrically connected with the microprocessor (5) of the intelligent detection system (1), and the microprocessor (5) respectively measures the real-time voltages of the A phase, the B phase and the C phase, Current and residual current of the main circuit.
3. The intelligent monitoring system of internet of things capable of being assembled and connected according to claim 1, wherein the pluggable wireless communication module (8) comprises a 4G communication module or a 5G communication module, the 4G communication module, the 5G communication module or the WiFi module is alternatively electrically connected with the pluggable wireless communication module interface (8), and the power module provides power for the signal acquisition module (4), the microprocessor (5), the key setting module (6), the display module (7), the pluggable wireless communication module (8), the wired communication interface (9) and the alarm module (10).
4. The intelligent monitoring system of the assembled low-voltage internet of things as claimed in claim 1, wherein the display module (7) is electrically connected with the microprocessor (5), the microprocessor (5) transmits the voltage and current of each phase of the alternating current circuit, the residual current signal of the main circuit and the fault state information of the circuit to the display module (7) in real time for displaying, and when the alternating current circuit fails, the screen brightness of the display module (7) is intermittently and alternately increased and decreased.
5. The intelligent monitoring system for the assembled low-voltage Internet of things as claimed in claim 1, wherein the alarm module (10) comprises a buzzer (17) and an alarm signal lamp (18), and in a fault state, the microprocessor (5) sends an alarm signal to the buzzer (17) and the alarm signal lamp (18) to respectively send out sound and light signals to alarm.
6. The assembly type low-voltage Internet of things intelligent monitoring system according to claim 1, wherein the key setting module (6) is electrically connected with the microprocessor (5), and the reference voltage value, the reference current value and the reference residual current value are modified through the key setting module (6).
7. The intelligent monitoring system of the assembled low-voltage internet of things of claim 1, wherein the circuit state information comprises real-time voltage values and real-time current values of all phases of the alternating current circuit, real-time residual current values, early warning information, time of occurrence of early warning, fault information and time of occurrence of faults of the main circuit.
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