CN104821551A - Intelligent detection protector for three-phase motors - Google Patents
Intelligent detection protector for three-phase motors Download PDFInfo
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- CN104821551A CN104821551A CN201510230535.2A CN201510230535A CN104821551A CN 104821551 A CN104821551 A CN 104821551A CN 201510230535 A CN201510230535 A CN 201510230535A CN 104821551 A CN104821551 A CN 104821551A
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Abstract
An intelligent detection protector for three-phase motors can measure and display the real-time voltage, current and power of a three-phase motor during running and quickly offer protection to phase loss and overload. All devices of the intelligent detection protector are installed in a plastic shell. The front of the shell is equipped with three rows of digital tubes arranged in order of A, B and C and used for sequentially displaying the three-phase voltage, three-phase current and real-time power (KW) of a motor which are sequentially displayed at three different times. Once phase loss is found in the current of a phase or the load increases suddenly and obviously, the protector acts to cut off a three-phase power supply. The intelligent detection protector of the invention is mainly composed of a single chip microcomputer, and an A/D converter, an analog switch, an AC/DC converter, a current transformer, an LED display and three solid-state relays, all of which are connected with the single chip microcomputer. An intelligent instrument composed of the single chip microcomputer, the analog switch and the A/D converter measures and displays the running process of a motor in real time, and cuts off the solid-state relays to protect the motor if critical abnormality is found. The abstract drawing shows the display interface of three-phase voltage measurement.
Description
Technical field
The invention belongs to intelligence manufacture field, is that the infant industry based on intellectual technology detects Protection Product.
Technical background
Threephase motor is current application dynamic power machine the most widely, no matter gross power or total number of units, and it is all the certain eldest child in human being's production, life activity undoubtedly.But from inventing from threephase motor, so far over more than 100 year, in operation, unexpected phenomenon of burning is inherent, and the method for not effecting a radical cure so far becomes a century-old difficult problem for puzzlement scientific and technological circle.
This accident burns topmost two kinds of situations, is phase shortage and overload respectively.Lose a phase current because threephase motor is in operation, motor still can remain in operation, and people are difficult to discover; But the injury of phase shortage to motor is fatal, after running a period of time, can burn because temperature rise is too high.In two kinds of situation, one is unexpected blocking to overload, and motor does not turn completely, and electric current sharply raises, and namely short time built-in motor is burnt; Another kind is serious overload, burns after running a period of time when not perceiveed by people.
Motor surprisingly burns and usually brings very large loss to enterprise.Due to hard to guard against, enterprise deeply hurts.The direct losses caused therefrom and related comprehensive loss are very large numerals with regard to the whole nation.Because worldwide motor security protection problem does not also thoroughly solve, have the whole world in view, motor surprisingly burns the evapotranspiration caused, and just more can not despise.
In order to solve this century difficult problem, scientific and technological circle are all making great efforts the method for seeking solution always.Current market also have panoramic protector for three-phase motor in sale and use, but its defect with poor quality but high price seriously hinders the universal of this product and promotes, make the protection of motor remain " old, large, difficult " problem of industrial quarters.
Present known protector for three-phase motor, complex structure, production cost is high, and debugging difficulty is large, and nature can cause selling price high.The protector for three-phase motor of one several kilowatts, price more than 200 yuan, with a small power motor close prices.People often would rather be lucky one, is also reluctant that flower gives a long price for the protector of " seldom working ".And once have an accident, some is regretted unavoidably again.In being repeatedly entangled with, product is difficult to promote, and a difficult problem still exists.
Intelligent electrotechnical instrument is international headache, and Ye Shi China " 863 Program " attacks problem not gram for a long time.Before an intelligent electrotechnical instrument difficult problem is outstanding, the present situation that the function of all kinds of motor protector is poor, complex structure, price are high also will continue.
Inventor will declare before this and " the intelligent general-purpose An Fubiao " that announced and the portion of techniques of " intelligent three-phase power distributing meter " are applied to the present invention; the threephase motor Intelligent Measurement protector that to design with intelligent electrotechnical instrument be core; structure is simple, cost is low, easy adjustment, powerful; overturn the natural mode of known all kinds of protector; not only make a century-old difficult problem solve one day, and great-leap-forward enter intellectualization times.Through linking up with industry, lower price makes it " being willing to join an intellective protector for every platform motor ".
More estimable, with existing technical merit, want to detect the operating electric current of threephase motor and performance number, even professional person also will cause considerable trouble.The present invention can make above-mentioned detection automatically realize, and shows at any time.Appearing on the market of product of the present invention, will bring very big advantage to industrial quarters.
Summary of the invention
In order to solve a protection difficult problem for threephase motor, present invention employs following four kinds of new design: with solid-state relay control three phase mains, noiselessness, shockproof and be easy to control; Detect on-Line Voltage and current value in real time with intelligent electrotechnical instrument, then calculate the realtime power of motor accordingly; Three-phase voltage value becomes millivolt value through voltage divider, and three-phase electricity flow valuve, through the load resistance of secondary transformer, becomes the alternating voltage of hundreds of millivolts; This voltage of two hundreds of millivolts converts direct voltage to through AC/DC transducer and gives A/D converter.So far, complete intellectualized detection, a preventing mechanism have just been built.Single-chip microcomputer access A/D converter, the three-phase voltage value obtain detection and three-phase electricity flow valuve show respectively, calculate again the realtime power of motor, and show from magnitude of voltage and current value; If current value and performance number are all normal, carry out next round detection; If current value phase shortage, turn off No. three relays immediately; If performance number overrate 30%, performance number flicker warning, but do not shut down, whether dispose and artificially determine; If performance number overrate 40%, shut down after buzzer intermittently gives a warning 3 minutes; If performance number overrate was shut down after 50%, 30 seconds; If performance number overrate was shut down after 100%, 15 seconds; If performance number overrate 200%, shut down after 5 seconds.Why so design, be in order to when load is once in a while by card, provide the emergency action time, so as not to mechanism too sensitive causing act frequently.And overload in short-term, because the anti-overload ability of motor own is very strong, still obvious damage can not be caused.In commercialization process, above-mentioned delay data adjusts on demand, makes the degree that intelligent protection function reaches perfect.
The theoretical foundation more than designed is, can exceed 10% (being greater than 420V) of rated voltage through actual measurement line voltage in electricity consumption paddy section, and therefore, when motor realtime power exceeds the quata definite value 20%, only display, ignores; When Short-time Overload, delay start protection mechanism.Facts have proved when heavy load starting, motor current super rated current more than 3 times and harmless in short-term, this is the rationale of above-mentioned delay protection.
Compared with prior art, the present invention has following beneficial effect:
1, put the axe in the helve
This of effective protection that threephase motor is in operation in industry century a difficult problem, thoroughly solved.
2, powerful
The present invention not only has sensitive, preventing mechanism accurately, and can monitor the real time execution situation of every platform motor, and voltage, electric current, performance number show at any time, are genuine intelligent artifacts.
3, be convenient to produce
The present invention take intelligent instrument as core, and structure is simple, and adjustment is easy; The product of different size, its difference is only that the specification of solid-state relay summation current transformer is different, and chassis size is different, is convenient to very much a large amount of production.
4, cost performance is high
Product price of the present invention will be starkly lower than the price of known all kinds of motor protector; Multinomial intelligent functions improves the cost performance of product by a larger margin.
5, promote easily
Because product price meets consumer expectation, and the design of novelty and powerful function, will cause the desire to purchase of enterprise consumingly, product will be accepted by industry rapidly and generally apply.
6, Benefit
After industry generally adopts product of the present invention, surprisingly burn the direct losses caused and the comprehensive loss caused therefrom will effectively be prevented by motor, country, enterprise and society all will therefrom obtain huge economic benefit.
7, intelligent instrument experimental plot
Universality intelligent electrotechnical instrument, does not worldwide call again and again not out.The invention of inventor's a series of intelligent instrument, first implements from this example, practicality, under battle conditions, for professional instrument production then obtains experience.
8, sing Chinese intelligence loudly to make
It is worldwide leading in the world that the present invention is expected to formation, thus show the huge glamour that Chinese intelligence is made.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
Fig. 2 is voltage display interface of the present invention.
Fig. 3 is electric current display interface of the present invention.
Fig. 4 is power display interface of the present invention.
Fig. 5 is overhaul flow chart of the present invention summary.
Embodiment
With reference to Fig. 1: the present invention forms a direct voltage millivoltmeter, in order to measure three-phase voltage and the three-phase current of motor by single-chip microcomputer and the A/D converter be attached thereto; Three-phase voltage through R1--
The voltage divider of three group 1/1000 of R6 composition, decays to the interchange millivolt voltage of same numerical value, and sends to VA, VB, VC port of analog switch by ac commercial power voltage; Three power lines are through three current transformers LA, LB, LC, and the induced current that level produces secondarily flows through load resistance RA, RB, RC, and the sampling voltage that load resistance produces delivers to analog switch IA, IB, IC port; VA, VB, VC three-phase voltage value and IA, IB, IC three-phase electricity flow valuve are delivered to AC/DC transducer by single-chip microcomputer successively, after converting alternating voltage to direct voltage, then deliver to the input of A/D converter; Three groups of 12 light-emitting diode displays are connected with single-chip microcomputer, in order to display measurement data.
Three road voltage signals and three road current signals are delivered to A/D converter through analog switch and are carried out A/D conversion by single-chip microcomputer successively, and the digital signal obtained divides into groups to show successively.First time display three-phase voltage value, suffix U represents V; Second time display current value suffix is A; According to voltage and current value, calculate motor realtime power, the first row display P=during display performance number, the second row display data, the color indicator light of KW printing opacity is bright, represents the realtime power of motor.If current value and performance number are all normal, carry out next round detection; If current value phase shortage, turn off No. three relays immediately; If performance number overrate 30%, performance number flicker warning, but do not shut down, whether dispose and artificially determine; If performance number overrate 40%, shut down after buzzer intermittently gives a warning 3 minutes; If performance number overrate was shut down after 50%, 30 seconds; If performance number overrate was shut down after 100%, 15 seconds; If performance number overrate 200%, shut down after 5 seconds.Protection act drives three solid-state relays to perform by single-chip microcomputer by reverser 4069.
Product of the present invention adopts plastic casing.Referring to Fig. 2: four circular holes through before and after having on the right side of shell, four power lines insert from rear circular hole, and wherein three phase lines are through the current transformer on pcb board.Line in the past circumference hole out after, be packed on A, B, C, N tetra-terminals of terminal box.Three power lines of motor are connected on the outside binding post of A, B, C tri-terminals.
Power rating establishes value by button Y, H, L, and its numerical value conforms to the name plate of motor.
Operation citing
Be installed in by protector below air switch, four power lines are through the circular hole above casing, and be connected on bottom-right binding post, motor power line does not temporarily connect.Close air switch, and namely instrument shows three-phase voltage value, and current value is 0.Click Y key, enter the pattern of setting, magnitude of voltage disappears, first row display P=, and second row display 00.00, KW lamp is bright, the 3rd row's blanking.Click H key, arrange high-order performance number, such as 07, click L key, arrange low-value 50, so far 7.5KW power-handling capability setting is complete.Click Y key, exit the pattern of setting, show beginning in turn, first time shows three-phase voltage; Second time shows three-phase current, is full 0; Third time shows 7.5KW, and without P=mark, expression power is set point.So far, arrange, verify complete, performance number is remembered.Connect motor power line, close air switch, and motor and protector enter normal operation, detection, show state.
It is more than the citing introduction of less than 10 kilowatts product specifications of the present invention.Relevant upgrading in commercialization process improves, and tandem product, all should be included within protection scope of the present invention.
Claims (7)
1. a threephase motor Intelligent Measurement protector, it is characterized in that, single-chip microcomputer is connected with A/D converter composition intelligent DC voltage millivolt table, single-chip microcomputer forms three group of 1/1000 voltage divider by analog switch and R1-R6 six resistance, the three-phase voltage of motor reduces to through voltage divider the VA that millivolt step voltage delivers to analog switch, VB, VC tri-input ports, motor three power lines are through three current transformer LA, LB, LC, its secondary current is by load resistance RA, RB, RC produces sampling voltage, deliver to analog switch IA, IB, IC port, three-phase voltage value and three-phase electricity flow valuve are given after AC/DC transducer converts direct voltage to successively by analog switch under Single-chip Controlling, give A/D converter again, three groups 12 the light-emitting diode display display measurement values be connected with single-chip microcomputer, three solid-state relays be connected with single-chip microcomputer are used for controlling the break-make of motor power.
2. threephase motor Intelligent Measurement protector according to claims 1, is characterized in that, measurement result divides three displays, and first time shows A, B, C three-phase voltage value, and second time display three-phase electricity flow valuve, third time shows performance number.
3. threephase motor Intelligent Measurement protector according to claims 2; it is characterized in that; magnitude of voltage suffix is charactron font U [replacing V]; current value suffix is charactron font A; performance number prefix is charactron font P, and lights the color LED light of KW [kilowatt] printing opacity simultaneously.
4. threephase motor Intelligent Measurement protector according to claims 1; it is characterized in that; voltage measurement adopts the three-phase 220V voltage measurement method of center line altogether; reduce magnitude of voltage with simplified measurement circuit; make that measurement is more convenient, safety; for adapting to commercial power custom, the voltage of about 220V being multiplied by 1.732, showing that the voltage of about 380V shows again.
5. threephase motor Intelligent Measurement protector according to claims 1, is characterized in that, when judging that certain phase current is zero by single-chip microcomputer with program, turn off three phase mains immediately, protection motor.
6. threephase motor Intelligent Measurement protector according to claims 1; it is characterized in that; single-chip microcomputer is with the protection range of program setting performance number; and setting ratio and rated power are compared; to determine whether to transfinite, and be take time delayed turn-off or power cutoff immediately according to the ratio-dependent that transfinites.
7. threephase motor Intelligent Measurement protector according to claims 1, is characterized in that, power rating, is undertaken setting and being remembered by single-chip microcomputer by nameplate nominal value by Y, H, L tri-buttons before motor start-up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510230535.2A CN104821551A (en) | 2015-05-08 | 2015-05-08 | Intelligent detection protector for three-phase motors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510230535.2A CN104821551A (en) | 2015-05-08 | 2015-05-08 | Intelligent detection protector for three-phase motors |
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| CN104821551A true CN104821551A (en) | 2015-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510230535.2A Pending CN104821551A (en) | 2015-05-08 | 2015-05-08 | Intelligent detection protector for three-phase motors |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202094829U (en) * | 2011-06-24 | 2011-12-28 | 人民电器集团有限公司 | Sampling device used for motor soft start |
| CN102308348A (en) * | 2011-07-20 | 2012-01-04 | 华为技术有限公司 | Current transformer and current detection circuit and detection method |
| CN103066563A (en) * | 2012-12-24 | 2013-04-24 | 安徽金捷光电科技有限公司 | Intelligent motor protector system |
| CN204046134U (en) * | 2014-09-03 | 2014-12-24 | 西安嘉信铁路器材有限公司 | A kind of phase failure protector circuit |
| CN204205633U (en) * | 2014-09-29 | 2015-03-11 | 浙江永升新能源科技有限公司 | Network-type MPPT solar charging controller |
-
2015
- 2015-05-08 CN CN201510230535.2A patent/CN104821551A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202094829U (en) * | 2011-06-24 | 2011-12-28 | 人民电器集团有限公司 | Sampling device used for motor soft start |
| CN102308348A (en) * | 2011-07-20 | 2012-01-04 | 华为技术有限公司 | Current transformer and current detection circuit and detection method |
| CN103066563A (en) * | 2012-12-24 | 2013-04-24 | 安徽金捷光电科技有限公司 | Intelligent motor protector system |
| CN204046134U (en) * | 2014-09-03 | 2014-12-24 | 西安嘉信铁路器材有限公司 | A kind of phase failure protector circuit |
| CN204205633U (en) * | 2014-09-29 | 2015-03-11 | 浙江永升新能源科技有限公司 | Network-type MPPT solar charging controller |
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Application publication date: 20150805 |
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| RJ01 | Rejection of invention patent application after publication |