CN103699032A

CN103699032A - Intelligent comprehensive monitor of three-phase motor

Info

Publication number: CN103699032A
Application number: CN201310665673.4A
Authority: CN
Inventors: 陈威宁; 牛昱光; 郭文斌; 李戈兵; 丁力; 贾瑞
Original assignee: SHANXI HUAKONGWEIYE TECHNOLOGY Co Ltd
Current assignee: SHANXI HUAKONGWEIYE TECHNOLOGY Co Ltd
Priority date: 2013-12-11
Filing date: 2013-12-11
Publication date: 2014-04-02
Anticipated expiration: 2033-12-11
Also published as: CN103699032B

Abstract

The invention discloses an intelligent comprehensive monitor of a three-phase motor and belongs to the technical fields of electromechanical protection and fault diagnosis. The intelligent comprehensive monitor is characterized in that the starting and operation state of the three-phase motor are monitored in real time, namely short circuit, locked rotor, overload, phase loss, under voltage, excess voltage, unbalance, electric leakage and underloading faults occurring during the starting and operation processes of the motor are alarmed and protected; the operation voltage, current, measured active, idle and power factors of one-phase and three-phase power of the motor, the leakage current of the motor, the motor temperature, the cumulative operation time of the motor and clock parameters are displayed; the operation voltage and current of the motor during fault protection process are recorded and inquired. The intelligent comprehensive monitor adopts a split structure of a mainframe and a current transformer which can form a split type and can also form an integrated type, and can meet the installation requirements of different cabinet types of a user.

Description

A kind of intelligent comprehensive watch-dog of three phase electric machine

Technical field

The invention belongs to mechanical and electrical protection and fault diagnosis technology field; relate to three phase electric machine monitors in real time when start-up and operation state; can find early the operation troubles of motor; and provide response signal according to the difference of fault type; reach and protect timely and effectively motor, prevent technical scheme destructive and that catastrophic failure occurs.

Background technology

The intelligent comprehensive monitor apparatus of three phase electric machine refers to that motor has very sensitive protective effect while there is the faults such as short circuit, stall, overload, phase shortage, under-voltage, overvoltage, unbalance, electric leakage, underloading in start-up and operation process, can timely and effective reliable protection motor.Motor is a kind of mechanical, electrical calutron that can change of realizing.Motor is that the development of motor has also promoted improving constantly of social productive forces conversely along with the development of yield-power.Motor occupies very important status as the important component part in dragging system in national economy, its use has almost been penetrated into all trades and professions, it is the important leverage that industry agricultural and national defense construction and people's lives are normally carried out, the normal operation of guaranteeing motor is very important, and it is of common occurrence to cause in actual use burn-down of electric motor even to cause the event of serious accident, therefore the protection of carrying out motor is to enhancing productivity and economic benefit, guarantee that safety in production is significant, and improving constantly along with Automation of Manufacturing Process level, to the safe operation of motor, require also more and more higher.The electronic circuit that traditional motor protecting device is comprised of separated components and parts or integrated circuit mostly, due to device and circuit, all there are some problems in the reliability and sensitivity of holding circuit.Constantly perfect along with the continuous progress of science and technology and technique, for meeting the requirement of automated production, need to further improve the control enclosure protection class of motor, reaches timely and effective reliable protection motor.Along with the develop rapidly of electronic technology, the intellectuality of Protection Technology becomes inexorable trend.

Summary of the invention

The intelligent comprehensive watch-dog of a kind of three phase electric machine of the present invention, it is characterized in that this watch-dog is that a kind of three phase electric machine is at the Real-time monitor of start-up and operation state, comprise the short circuit that motor occurs in start-up and operation process, stall, overload, phase shortage, under-voltage, overvoltage, unbalance, electric leakage, underloading fault is reported to the police and is protected, the working voltage that can show motor, electric current, single-phase and three phase power metering (is gained merit, idle, power factor (PF)) motor device leakage current, motor temperature, motor Cumulative Elapsed Time and timing parameter, can record and inquire about motor working voltage and electric current while there is emergency protection.It by: the record of signal pickup assembly, signal intelligent processor, fault parameter and inquiry unit and programming implement device form:

signal pickup assembly

Described signals collecting is partly the collection to electric current, voltage, electric leakage and temperature signal.Wherein utilize three single-ended input channels of ADE7758ARW to carry out the collection of voltage signal, the maximum magnitude of change in voltage is ± 0.5V to utilize the current channel of ADE7758ARW to gather three pairs of differential voltages, can the be set to ± 0.5V of input voltage that three tunnels are corresponding, ± 0.25V, ± 0.125V.The sheet choosing of ADE7758ARW, thus serial clock signal, data input, data output and interrupt request singal line directly the I/O mouth corresponding with single chip computer AT 89C51 be connected and realize communication.Utilize the two-stage amplifying circuit that LMV358ID builds to gather electric leakage signal, then send the I/O mouth of AT89C51 to.Temperature acquisition is that single-chip microcomputer reads from temperature design module by RS485 communication.

signal intelligent processor

After voltage and current signal is collected by ADE7758ARW, in inside, do a large amount of computings, ADE7758ARW has 6 road analog inputs, be divided into two passages of electric current and voltage.Electric current and voltage channel respectively have a programmable gain amplifier large I that gains to be made as 1,2 or 4.Calculating and the processing of effective value measurement, cycle and frequency values measurement, active energy metering, reactive energy measurement and apparent electric energy metrical can be carried out in its inside, and result is all stored in corresponding registers.Various settings, operation and the data of ADE7758ARW read all and realize by these registers.First each register will carry out the operation of a write access register when read-write, then start to transmit data, here single chip computer AT 89C51 is selected with the control of clock cable and is write or read required parameter information to ADE7758ARW by sheet, by the current duty of these parameter information judgement motors, and then make corresponding action.Electric leakage signal collection is data to be passed to single-chip microcomputer after processing through operational amplification circuit, and single-chip microcomputer judges whether to exist leaky after to data processing, then carries out corresponding actions.Single chip computer AT 89C51, as main control chip, is used for judging whether the signal parameter obtaining occurs extremely, and then motor is protected or reported to the police.

the record of fault parameter and query portion device

The record of fault parameter and inquiry refer to when motor broke down in the start-up and operation stage, single chip computer AT 89C51 can occur emergency protection time Parameter storage and query function is provided.In single chip computer AT 89C51 peripherals, connected storage chip AT24C256 and clock chip DS13072, time of motor working voltage, electric current and generation that so just can be when breaking down etc. stores, and finds out failure cause by query function.

programming implement device

Owing to realizing above-mentioned analysis main control processor, only need carry out a small amount of computing, so AT89C51 single-chip microcomputer can be competent at completely.In display section, adopt STC12LE5612AD processor, by serial ports and AT89C51 microcontroller communication, complete many LED light and 5 charactron Presentation Functions and 4 button operations.For meeting under rugged surroundings as the user demand of the industrial and mining enterprises such as petrochemical industry, smelting, coal separation, system must be made to easy-to-install product, therefore under C language environment, programme and realize intellectual analysis, by tool storage room, complete the programming of software, finally download in AT89C51 and STC12LE5612AD single-chip microcomputer, complete commercialization.

Described signal intelligent treating apparatus also comprises having 3 road programmable relay passive contact outputs, to realize switching value warning output, protection output, chain output or electric machine step-down starting, controls.

The advantage of the intelligent comprehensive watch-dog of a kind of three phase electric machine of the present invention is:

(1) adopt main frame and current transformer split mechanism, both can form separation type, can be combined in again the type that is integrally formed together, can meet the installation requirements of the different cabinet types of user.

(2) protector panel can show the parameter such as working voltage, electric current, motor device leakage current of motor, and can record and inquire about the parameters such as motor working voltage while there is emergency protection, electric current.

(3) powerful, there is RS485 communication interface, adopt Modbus RTU communication protocol, can realize networking monitoring.

(4) there is the passive contact output of two-way relay, can be used as the chain output of protection and switching value warning output.

Accompanying drawing explanation

Fig. 1 is the shape assumption diagram of the embodiment of the present invention one (one-piece type);

Fig. 2 is the block diagram of the embodiment of the present invention one;

Fig. 3 is the Acquisition Circuit figure of the embodiment of the present invention one voltage and current signal;

Fig. 4 is the circuit theory diagrams of the signal intelligent processor CPU module of the embodiment of the present invention one;

Fig. 5 is the serial communication task image of the embodiment of the present invention one;

Fig. 6 is the interface circuit figure of the embodiment of the present invention one display section.

Fig. 7 is the shape assumption diagram of the embodiment of the present invention two (separation type).

In figure, 1, main frame, 2, current transformer.

Embodiment

By reference to the accompanying drawings the specific embodiment of the present invention is further described in detail as follows:

Embodiment mono-: as shown in Figure 1, the present embodiment adopts main frame 1 and current transformer 2 to combine the type of being integrally formed.

As described in Figure 2, the intelligent comprehensive watch-dog of a kind of three phase electric machine of the present invention, comprises that signals collecting, signal intelligent are processed, fault parameter is stored and programming realizes part.In signals collecting voltage and current signal be after ADE7758ARW processes by processor A T89C51 reading current, information of voltage, the inputs of electric leakage and switching value are the I/O mouths that is directly inputted to processor.Processor is processed after receiving input message, then makes corresponding action, comprising the protection action that sends display command and relay to STC12LE5612.

As described in Figure 3, be the Acquisition Circuit of electric current of the present invention and voltage signal.The IAP pin of ADE7758ARW of the present invention connects a pin of C15 electric capacity and R30 resistance, another pin ground connection of C15 electric capacity, another pin of R30 resistance connects IA+, IAN pin connects a pin of C14 electric capacity and R27 resistance, another pin ground connection of C14 electric capacity, another pin of R27 resistance connects IA-, between IA+ and IA-, access R28 and R29 resistance, IBP pin connects a pin of C13 electric capacity and R26 resistance, another pin ground connection of C13 electric capacity, another pin of R26 resistance connects IB+, IBN pin connects a pin of C12 electric capacity and R23 resistance, another pin ground connection of C12 electric capacity, another pin of R23 resistance connects IB-, between IB+ and IB-, access R24 and R25 resistance, ICP pin connects a pin of C11 electric capacity and R22 resistance, another pin ground connection of C11 electric capacity, another pin of R22 resistance connects IC+, ICN pin connects a pin of C10 electric capacity and R19 resistance, another pin ground connection of C10 electric capacity, another pin of R19 resistance connects IC-, between IC+ and IC-, access R20 and R21 resistance, ADE7758ARW utilizes IA+ and IA-, IB+ and IB-, IC+ and IC-gather three pairs of differential voltages, can the be set to ± 0.5V of input voltage that three tunnels are corresponding, ± 0.25V, ± 0.125V.The VAP pin of ADE7758ARW connects the filter protective circuit that is comprised of C9 and R18 and a pin of R6 resistance; another pin of R6 resistance meets UA; VBP pin connects the filter protective circuit that is comprised of C8 and R3 and a pin of R5 resistance; another pin of R5 resistance meets UB; VCP pin connects the filter protective circuit that is comprised of C1 and R2 and a pin of R4 resistance; another pin of R4 resistance meets UC; utilize three single-ended input channel UA, UB, the UC of ADE7758ARW to carry out the collection of voltage signal, the maximum magnitude of change in voltage is ± 0.5V.

As described in Figure 4, be record and the memory circuit schematic diagram of fault parameter of the present invention.In figure mainly by four chips; be processor A T89C51, storer AT24C256 and ferroelectric memory FM24C64 and clock chip DS1307; when motor breaks down protection; processor is understood readout clock data and is stored in AT24C256 together with other Protection parameters; for inquire about failure cause later; ferroelectric memory FM24C64 is for real-time storage data, and every 0.5S storage once.In the present invention, between the XTAL1 of processor A T89C51 and XTAL2 pin, access the bipod of crystal oscillator X4, the bipod of crystal oscillator X4 connects respectively a pin of capacitor C 25 and C26, and another pin ground connection of capacitor C 25 and C26 completes the start-oscillation circuit of processor; The P0.6 pin of AT89C51 connects the SDA pin of AT24C256 and the SDA pin of DS1307 for data transmission, the P0.7 pin of AT89C51 connects the SCL pin of AT24C256 and the SCL pin of DS1307 for controlling sequential, between the X1 of DS1307 and X2 pin, access crystal oscillator X3 and complete oscillatory circuit, VCC and GND pin connect respectively VDD-to-VSS, Vbat pin connects the positive pole of externally fed circuit battery, thereby guaranteeing under powering-off state that external power source can be powered guarantees that clock is correct, the VCC pin of AT24C256 meets power supply 5V, and A0, A1, A2, VSS pin be ground connection all; The P0.0 pin of AT89C51 connects the SCL pin of FM24C64, P0.1 pin connects the SDA pin of FM24C64, the A0 of FM24C64, A1, A2, WP, VSS pin be ground connection all, just can complete like this data transmission and store and realize real-time storage data between AT89C51 and FM24C64.

As described in Figure 5, serial ports of the present invention receives the specification of task, is according to PROFIBUS communications protocol or MODBUS protocol processes watch-dog and host computer exchange message.Task is divided into Liang Geliang great branch, enters that PROFIBUS communications protocol is processed or MODBUS agreement RTU mode is processed according to hardware design, namely after receiving host computer information, decomposes, and after processing respectively, replys according to the request type of host computer.

First when having communication task, judging whether it is 485 communications, if judgment result is that otherwise enter branch one, process (PROFIBUS protocol processes), is to enter branch two and process (MODBUS protocol processes) if judgment result is that.In branch one processes, be mutual until then interaction success sends a secondary data to SPC3 in 0.5 second with SPC3.In processing, branch two first waits for host computer information, until judge whether it is to call out the machine during conditions being possessed, if not call out the machine the zero clearing of count pick up device, wait for communication task next time, if determine, be to call out calculation check code of the machine, after completing, calculating judges that whether check code is correct, if check code misjudgment is the zero clearing of count pick up device, wait for communication task next time, if whether the order of judgement execution host computer is correct again for check code correct judgment, if the command execution mistake of host computer is the zero clearing of count pick up device, wait for communication task next time, if host computer fill order is calculation check code more correctly, after having calculated, check code starts to start transmission data, after data are sent completely, namely this communication task finishes, wait for communication task next time.

As described in Figure 6, display section interface circuit figure of the present invention, adopts STC12LE5612AD processor in display section, complete many LED light and 5 charactron Presentation Functions and 4 button operations.In figure, there are two SN74HC595D, one of them output of the data for charactron, the data output that another is light emitting diode.Main implementation process, for receiving after display command when STC12LE5612AD processor, selects function to control two SN74HC595D output display data to corresponding charactron or diode by sheet, refreshes displaying contents.

Embodiment bis-: as shown in Figure 7, it is split mechanism that the present embodiment adopts main frame 1 and current transformer 2, to meet the installation requirements of the different cabinet types of user; Other structure is identical with embodiment mono-.

Claims

1. the intelligent comprehensive watch-dog of a three phase electric machine, it is characterized in that: the start-up and operation state to three phase electric machine carries out Real-time monitor, comprise the short circuit that motor occurs in start-up and operation process, stall, overload, phase shortage, under-voltage, overvoltage, unbalance, electric leakage, underloading fault is reported to the police and is protected, the working voltage that shows motor, electric current, single-phase and three phase power measures gains merit, idle, power factor (PF), motor device leakage current, motor temperature, motor Cumulative Elapsed Time and timing parameter, motor working voltage and electric current when emergency protection appears in record and inquiry.

2. the intelligent comprehensive watch-dog of a kind of three phase electric machine according to claim 1, is characterized in that: the record of signal pickup assembly, signal intelligent processor, fault parameter and inquiry unit and programming implement device, consist of;

The collection of described signal pickup assembly to electric current, voltage, electric leakage and temperature signal, it comprises ADE7758ARW, single chip computer AT 89C51, utilize three single-ended input channels of ADE7758ARW to carry out the collection of voltage signal, the maximum magnitude of change in voltage is ± 0.5V, utilize the current channel of ADE7758ARW to gather three pairs of differential voltages, can the be set to ± 0.5V of input voltage that three tunnels are corresponding, ± 0.25V, ± 0.125V; The sheet choosing of ADE7758ARW, thus serial clock signal, data input, data output and interrupt request singal line directly the I/O mouth corresponding with single chip computer AT 89C51 be connected and realize communication; Utilize the two-stage amplifying circuit that LMV358ID builds to gather electric leakage signal, then send the I/O mouth of AT89C51 to; Temperature acquisition is that single-chip microcomputer reads from temperature design module by RS485 communication;

Described signal intelligent processor comprises ADE7758ARW, single chip computer AT 89C51, does a large amount of computings after voltage and current signal is collected by ADE7758ARW in inside, and ADE7758ARW has 6 road analog inputs, be divided into two passages of electric current and voltage; Electric current and voltage channel respectively have a programmable gain amplifier large I that gains to be made as 1,2 or 4; Calculating and the processing of effective value measurement, cycle and frequency values measurement, active energy metering, reactive energy measurement and apparent electric energy metrical can be carried out in its inside, and result is all stored in corresponding registers; Various settings, operation and the data of ADE7758ARW read all and realize by these registers; First each register will carry out the operation of a write access register when read-write, then start to transmit data, here single chip computer AT 89C51 is selected with the control of clock cable and is write or read required parameter information to ADE7758ARW by sheet, by the current duty of these parameter information judgement motors, and then make corresponding action; Single chip computer AT 89C51 by the electric leakage signal data that collect by analysis, judge whether to exist leaky after processing, then carries out corresponding actions; Single chip computer AT 89C51, as main control chip, is used for judging whether the signal parameter obtaining occurs extremely, and then motor is protected or reported to the police;

Voltage, electric current and time of origin when the record of described fault parameter and inquiry unit provide motor to break down in the start-up and operation stage store, and find out failure cause by query function; It comprises single chip computer AT 89C51, has connected storage chip AT24C256 and clock chip DS13072 in single chip computer AT 89C51 peripherals;

Described programming implement device comprises AT89C51 single-chip microcomputer, STC12LE5612AD processor, and STC12LE5612AD processor completes many LED light and 5 charactron Presentation Functions and 4 button operations by serial ports and AT89C51 microcontroller communication.

3. according to the intelligent comprehensive watch-dog of a kind of three phase electric machine claimed in claim 1; it is characterized in that described signal intelligent processor comprises having 3 road programmable relay passive contact outputs, controls to realize switching value warning output, protection output, chain output or electric machine step-down starting.