CN212364412U - Assembled low-voltage intelligent monitoring device - Google Patents

Abstract

The utility model provides a but pin-connected panel low pressure intelligent monitoring device belongs to low pressure monitoring technology field. The utility model comprises a signal acquisition module, a microprocessor, a key setting module, a display module, a communication interface and an alarm module, wherein the signal acquisition module comprises an isolation chip, a metering chip, 1 residual current sensor and 3 electric quantity sensors, the electric quantity sensors respectively measure the voltage, the current and the power factor of an alternating current circuit, and the residual current sensors measure the residual current of a three-phase alternating current main circuit; the utility model discloses a but pin-connected panel low pressure intelligent monitoring device, microprocessor will follow voltage, electric current, power factor and the residual current that obtains of measurement chip and the reference value that can change respectively and carry out the comparison to judge whether the residual current of alternating current circuit voltage, electric current or alternating current circuit takes place early warning and trouble, compare in current circuit monitoring device, have and can adjust each item reference value according to the actual conditions of circuit, improve the advantage of power consumption safety.

Description

Assembled low-voltage intelligent monitoring device

Technical Field

The utility model relates to a low pressure monitoring technology field especially relates to a but pin-connected panel low pressure intelligent monitoring device.

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 low-voltage monitoring technology, apply low-voltage monitoring technology to low-voltage distribution equipment and can satisfy the new requirement of reliability, security and convenience that the user provided to low-voltage distribution equipment better.

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 modified according to the connected circuit.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the above-mentioned problem, a but pin-connected panel low pressure intelligent monitoring device is provided.

In order to achieve the above purpose, the utility model adopts the following technical proposal:

an assembled low-voltage intelligent monitoring device comprises an intelligent detection system, wherein the intelligent detection system comprises a signal acquisition module, a microprocessor, a key setting module, a display module, a communication interface and an alarm module, and the signal acquisition module, the key setting module, the display module, the communication interface and the alarm module are all electrically connected with the microprocessor; the signal acquisition module transmits acquired voltage, current and residual current signals of the three-phase circuit of each phase to a metering chip, the metering chip is electrically connected with a microprocessor, the microprocessor compares the received voltage signals, current signals and residual current signals with reference voltage values, reference current values and reference residual current values respectively to judge whether the circuit has early warning or faults, the early warning comprises voltage abnormity early warning, current abnormity early warning and residual current abnormity early warning, and the faults comprise voltage abnormity faults, current abnormity faults and residual current faults; analyzing the collected current signal and voltage signal, judging whether the AC circuit has zero-missing or phase-missing fault, when the circuit has the fault, the microprocessor sends a control signal to the communication interface from the RS485 interface, and when the circuit has the early warning or fault, the microprocessor sends the control signal to the alarm module to give an alarm; the microprocessor sends the circuit state information to the display module in real time, and the display module displays the circuit state information in real time.

In the above-mentioned assembling type low-voltage intelligent monitoring device, the signal acquisition module includes an isolation chip, a metering chip, a residual current sensor which is sleeved on the three phase lines and a zero line outlet end and is electrically connected with the metering chip through a sampling resistor and a filter circuit, and three a-phase electric quantity sensors, a B-phase electric quantity sensor and a C-phase electric quantity sensor which are respectively sleeved on the a-phase, the B-phase and the C-phase and are electrically connected with the metering chip through the sampling resistor and the filter circuit, the metering chip is electrically connected with the isolation chip, the isolation chip is electrically connected with a microprocessor, and the microprocessor respectively measures the real-time voltage, the current, the residual current and the power factor of the main circuit of the a-phase, the B-phase and the C-phase.

In the above assembling type low-voltage intelligent monitoring device, the intelligent detection system further comprises a power module for providing power for the signal acquisition module, the microprocessor, the key setting module, the display module, the communication interface and the alarm module.

In the assembly type low-voltage intelligent monitoring device, the key setting module and the display module are electrically connected with the microprocessor, the microprocessor transmits the voltage and the 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 in real time and displays the fault state information, and when the alternating current circuit breaks down, the screen brightness of the display module is intermittently and alternately increased and decreased; and the key setting module modifies the reference voltage value, the reference current value and the reference residual current value on line or off line.

In the above-mentioned assembling type low-voltage intelligent monitoring device, the display module further includes a communication status indicator lamp and a power status indicator lamp which are arranged between the display module and the key setting module and electrically connected with the microprocessor.

In foretell but in pin-connected panel low pressure intelligent monitoring device, alarm module includes the bee calling organ with microprocessor electric connection, and during fault state, microprocessor sends alarm signal to bee calling organ and sends sound signal and report to the police.

In the above-mentioned assembling type low-voltage intelligent monitoring device, the circuit state information includes real-time voltage and real-time current of each phase of the alternating current circuit, real-time power factor, real-time residual current of the main circuit, early warning information, time of occurrence of early warning, fault information and time of occurrence of fault.

In the assembling type low-voltage intelligent monitoring device, 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.

Compared with the prior art, the utility model has the advantages of:

1. the design of a pin-connected panel low pressure 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 whether three-phase circuit has voltage anomaly, current anomaly, residual current anomaly, lacks zero or lack the looks trouble, can also real-time supervision circuit's power factor.

2. The reference voltage value, the reference current value and the reference residual current value can be locally modified in the key setting module. Local modification: the key module is electrically connected with the microprocessor module, the microprocessor module receives the key signal, respectively enters a modification menu of voltage, current and residual current, and modifies the corresponding reference value to finish the modification of the reference voltage value, the reference current value and the reference residual current value; the advantage of setting the reference voltage value, the reference current value and the reference residual current value as modifiable is that when the detected load connected with the alternating current circuit is changed, the corresponding reference value can be modified in time, and the power utilization is safer and more reliable.

3. The intelligent detection system and the execution mechanism are not arranged in the same device, so that the problem of low current-carrying capacity caused by the limitation of electromagnetic interference and electrical specifications is avoided.

Drawings

FIG. 1 is a schematic diagram of a low-voltage intelligent monitoring device;

FIG. 2 is a schematic diagram of an intelligent detection system;

FIG. 3 is a circuit diagram of an information collection module;

in the figure, the intelligent detection system 1, the signal acquisition module 2, the microprocessor 3, the key setting module 4, the display module 5, the communication interface 6, the alarm module 7, the isolation chip 8, the metering chip 9, the residual current sensor 10, the power module 11, the a-phase electric quantity sensor 12, the B-phase electric quantity sensor 13, the C-phase electric quantity sensor 14, the communication state indicator lamp 15, the power state indicator lamp 16, the buzzer 17, the alarm signal lamp 18, the 1# sampling resistor 19, the 1# resistor 20, the 1# capacitor 21, the 2# sampling resistor 22, the 2# resistor 23, and the 2# capacitor 24.

Detailed Description

As shown in fig. 1 to 3, an assembly type low-voltage intelligent monitoring device comprises an intelligent detection system, wherein the intelligent detection system comprises a signal acquisition module, a microprocessor, a key setting module, a display module, a communication interface and an alarm module, and the signal acquisition module, the key setting module, the display module, the communication interface and the alarm module are all electrically connected with the microprocessor; the signal acquisition module transmits acquired voltage, current and residual current signals of the three-phase circuit of each phase to a metering chip, the metering chip is electrically connected with a microprocessor, the microprocessor compares the received voltage signals, current signals and residual current signals with reference voltage values, reference current values and reference residual current values respectively to judge whether the circuit has early warning or faults, the early warning comprises voltage abnormity early warning, current abnormity early warning and residual current abnormity early warning, and the faults comprise voltage abnormity faults, current abnormity faults and residual current faults; analyzing the collected current signal and voltage signal, judging whether the AC circuit has zero-missing or phase-missing fault, when the circuit has the fault, the microprocessor sends a control signal to the communication interface from the RS485 interface, and when the circuit has the early warning or fault, the microprocessor sends the control signal to the alarm module to give an alarm; the microprocessor sends the circuit state information to the display module in real time, and the display module displays the circuit state information in real time. The real-time monitoring and analysis of the voltage, the current and the residual current of the three-phase circuit are realized, the safety and the reliability of power utilization are improved, meanwhile, the real-time power factor of the three-phase circuit is also detected, and data support is provided for improving the power utilization efficiency.

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, cannot be modified according to the changed circuit, and when the load of the detected circuit is changed, the related 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 2, the microprocessor 3, the key setting module 4, the display module 5, the communication interface 6, the alarm module 7 and the power module 11 are produced independently, and all the modules are only required to be welded or connected by connectors 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 the large-scale production of the intelligent detection system.

This monitoring devices does not include the actuating system, the separable benefit of monitoring devices and actuating system is the current-carrying capacity that can improve monitoring devices, when all concentrating on monitoring devices 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 monitoring devices and actuating system separation, then monitoring devices' current-carrying capacity can reach 125A, monitoring devices's range of application has been improved greatly, this monitoring devices's market prospect has been improved.

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 locally modified by the key setting module 4.

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.

The metering chip 9 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 the electric quantity sensor and filtered by the sampling resistor, and the chip can also provide the real-time measurement function and the electric quantity metering function of the power factor 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 13 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 9, 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 9, 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 9 by the circuit for measurement and calculation, and the reactive power of the circuit can be measured according to the circuit.

The metering chip 9 is electrically connected with the isolation chip 8, the isolation chip 8 is electrically connected with the microprocessor 3, and the microprocessor 3 obtains the currents and voltages of the A phase, the B phase and the C phase measured by the metering chip 9 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 is carried out in the key setting module 4, 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 monitoring device is connected with a three-phase load, whether the current three-phase fault detection mode is adopted is determined, and if not, the three-phase fault detection mode needs to be modified. 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 early warning value and less than the reference upper limit voltage value, judging that the voltage is an overvoltage early warning; 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; 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; 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.

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 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 3 is greater than the reference residual current early warning value and less than the reference residual current value, judging that the residual current is early-warning; if the residual current measured by the microprocessor 3 is greater than the reference residual current value, the residual current fault occurs in the alternating current circuit, and the risk of electric leakage may already occur.

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 4, and the microprocessor 3 compares the measured currents of the A phase, the B phase and the C phase with the single-phase reference upper limit current value.

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 early warning value and less than the single-phase reference upper limit voltage value, judging that the voltage is an overvoltage early warning; 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.

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 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 early warning value and smaller than the single-phase reference current value, judging that the current is an overcurrent early warning; 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 support online or offline modification through the key setting module 4, 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 the rated voltage of the single-phase circuit where the single-phase reference upper limit voltage value is located; the single-phase reference lower limit voltage value is 80% -85% of the rated voltage of the single-phase circuit.

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 86% -90% of the rated voltage of the three-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 the rated current of the single-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 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 9, the metering chip 9 is electrically connected with an isolation chip 8, the isolation chip 8 is electrically connected with a microprocessor 3, the signals of the residual current sensor 21a are transmitted into the microprocessor 3, the microprocessor 3 compares the measured residual current value with a reference residual current value, if the residual current value is larger than the reference residual current value, a three-phase circuit has a leakage fault, and if the real-time residual current value is larger than the reference residual current early warning value and smaller than the reference residual current value, the residual current of an alternating current.

The reference residual current value of the monitoring device supports a local modification mode through the key setting module 4. When the number of the electrical appliances connected to the circuit where the monitoring device 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 monitoring device, so that false alarm of the monitoring device and misoperation of an execution system are caused, and adverse effects are caused on normal electricity consumption.

The microprocessor 3 can also monitor the electric quantity in real time and display the electric quantity on the screen of the display module 5.

When the three-phase circuit has overvoltage, undervoltage, overcurrent, phase loss or zero loss faults, the microprocessor 3 sends corresponding control signals to the communication interface 6 through the RS485 interface, the communication interface 6 is electrically connected with the execution system, so that the execution system is controlled to execute the control signals sent by the microprocessor 3, meanwhile, the microprocessor 3 transmits alarm signals to the display module 5 and the alarm module 7 in real time, the display module 5 displays the voltage, the current, the real-time value of the residual current and the fault information of the three-phase circuit in real time, and the brightness of a display screen of the display module 5 is intermittently and alternately increased and decreased; when receiving the fault signal sent by the microprocessor 3, the alarm module 7 sends a sound signal to give an alarm to remind maintenance personnel to maintain in time.

Although the terms of the smart detection system 1, the signal acquisition module 2, the microprocessor 3, the key setting module 4, the display module 5, the communication interface 6, the alarm module 7, the isolation chip 8, the metering chip 9, the residual current sensor 10, the power supply module 11, the a-phase electric quantity sensor 12, the B-phase electric quantity sensor 13, the C-phase electric quantity sensor 14, the communication state indicator 15, the power state indicator 16, the buzzer 17, the alarm signal lamp 18, the 1# sampling resistor 19, the 1# resistor 20, the 1# capacitor 21, 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 in a manner that is inconsistent with the spirit of the invention.

Claims (8)

1. The split mounting type low-voltage intelligent monitoring device is characterized by comprising an intelligent detection system (1), wherein the intelligent detection system (1) comprises a signal acquisition module (2), a microprocessor (3), a key setting module (4), a display module (5), a communication interface (6) and an alarm module (7), and the signal acquisition module (2), the key setting module (4), the display module (5), the communication interface (6) and the alarm module (7) are electrically connected with the microprocessor (3);

the signal acquisition module (2) transmits acquired voltage, current and residual current signals of the three-phase circuit of each phase to the metering chip (9), the metering chip (9) is electrically connected with the microprocessor (3), the microprocessor (3) compares the received voltage signals, current signals and residual current signals with reference voltage values, reference current values and reference residual current values respectively to judge whether the circuit has early warning or faults, the early warning comprises voltage abnormity early warning, current abnormity early warning and residual current abnormity early warning, and the faults comprise voltage abnormity faults, current abnormity 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 (3) sends a control signal to the communication interface (6) from the RS485 interface, and when the circuit has the early warning or fault, the microprocessor (3) sends the control signal to the alarm module (7) for alarming; the microprocessor (3) sends the circuit state information to the display module (5) in real time, and the display module (5) displays the circuit state information in real time.

2. The assembly-type low-voltage intelligent monitoring device according to claim 1, the signal acquisition module (2) comprises an isolation chip (8), a metering chip (9) and a residual current sensor (10) which is sleeved at the outlet ends of the three phase lines and the zero line and is electrically connected with the metering chip (9) through a sampling resistor and a filter circuit, 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 the A phase, the B phase and the C phase and are electrically connected with a metering chip (9) through sampling resistors and filter circuits, the metering chip (9) is electrically connected with an isolation chip (8), the isolation chip (8) is electrically connected with a microprocessor (3), and the microprocessor (3) is used for respectively measuring real-time voltage, current, residual current and power factor of a main circuit of the A phase, the B phase and the C phase.

3. The assembly type low-voltage intelligent monitoring device according to claim 1, wherein the intelligent detection system (1) further comprises a power module for supplying power to the signal acquisition module (2), the microprocessor (3), the key setting module (4), the display module (5), the communication interface (6) and the alarm module (7).

4. The assembly type low-voltage intelligent monitoring device according to claim 1, wherein the key setting module (4) and the display module (5) are electrically connected with the microprocessor (3), the microprocessor (3) transmits and displays phase voltages and currents of each phase of the alternating current circuit, residual current signals of the main circuit and fault state information of the circuit to the display module (5) in real time, and when the alternating current circuit fails, the screen brightness of the display module (5) is intermittently and alternately increased and decreased; and the key setting module (4) modifies the reference voltage value, the reference current value and the reference residual current value on line or off line.

5. The assembly type low-voltage intelligent monitoring device according to claim 4, wherein the display module (5) further comprises a communication status indicator lamp (15) and a power status indicator lamp (16) which are arranged between the display module (5) and the key setting module (4) and electrically connected with the microprocessor.

6. The assembly type low-voltage intelligent monitoring device according to claim 1, wherein the alarm module (7) comprises a buzzer (17) electrically connected with the microprocessor (3), and when the fault state occurs, the microprocessor (3) sends an alarm signal to the buzzer (17) to send a sound signal for alarming.

7. The intelligent monitoring device of claim 1, wherein the circuit status information comprises real-time voltage and current of each phase of the alternating current circuit, real-time power factor, real-time residual current of the main circuit, early warning information, time of occurrence of early warning, fault information, and time of occurrence of fault.

8. The assembly type low-voltage intelligent monitoring device according to claim 1, wherein 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.

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