CN102195268A - Integrated protector of alternating-current motor - Google Patents
Integrated protector of alternating-current motor Download PDFInfo
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- CN102195268A CN102195268A CN2011100935284A CN201110093528A CN102195268A CN 102195268 A CN102195268 A CN 102195268A CN 2011100935284 A CN2011100935284 A CN 2011100935284A CN 201110093528 A CN201110093528 A CN 201110093528A CN 102195268 A CN102195268 A CN 102195268A
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Abstract
The invention discloses an integrated protector of an alternating-current motor, which comprises a main processor, an auxiliary processor and a power supply module, wherein the main processor is mutually connected with the auxiliary processor, the power supply module is connected with the main processor and the auxiliary processor, the input end of the main processor is respectively connected with a three-phase current sampler, a three-phase voltage sampler and an optically-coupled isolation switching value signal sampler; the input end of the auxiliary processor is respectively connected with a keyboard and a clock; the output end of the auxiliary processor is respectively connected with an LED indication lamp and a digital tube display; and the output end of the main processor is connected with a relay. The main processor and the auxiliary processor form a dual-CPU (Central Processing Unit) structure, and strong operation capacity, rich peripheral interface circuits and stronger control capacity of the dual-CPU structure are fully utilized, therefore, the integrated protector integrates multiple functions such as protection, control and the like into a whole to improve integral working performance and intelligent operation level.
Description
One. technical field: the present invention relates to a kind of motor protecter, particularly relate to a kind of alternating current machine comprehensive protection device.
Two. background technology: motor occupies critical role as the important component part in the dragging system in national economy, its use almost has been penetrated into all trades and professions, be industry, the important assurance that agricultural and national defense construction and people's lives are normally carried out, thereby the normal operation of guaranteeing motor just seems very important, and in use cause the incident of burn-down of electric motor even initiation serious accident of common occurrence, according to incompletely statistics, the whole nation is annual only just to reach tens million of degree because of the electric weight that burn-down of electric motor consumed, the quantity of burn-down of electric motor reaches more than 200,000 times, about 0.4 hundred million kilowatts of capacity, because of about 5,000 ten thousand kilograms of the electromagnetic wire that consumed of maintenance, price for repairing reaches 2,000,000,000 yuan, and because of loss that stop work and production the caused tremendous amount that can't estimate especially.
At present, motor protecter is generally adopted in the protection of motor, determine whether needing protection but popular now protector generally is a size according to electric current, this does not obviously consider the influence of environmental factor to motor.Motor its basic basis for estimation that whether needs protection should be whether the motor windings temperature surpasses its class of insulation temperature; under the situation of same current; for the high motor of ambient temperature; its possibility of burning obviously is greater than the low motor of environment; this merely judges that by the size of electric current whether motor needs protection not is science very, can not reach the fully protection of motor under various environment with regard to explanation.In addition; motor protecter does not have national standard; cause on the market product very different, now there is the deficiency that function is simple, disposal ability is poor, protection philosophy is perfect inadequately in the SCM Based comprehensive protector of motor of extensive use, thereby has limited himself application and development.
Three. summary of the invention:
Technical problem to be solved by this invention is: overcome the deficiencies in the prior art, the alternating current machine comprehensive protection device that provides a kind of and gather multi-function in integral whole, have advantages of higher stability, repeatability and real-time.
Technical scheme of the present invention is: a kind of alternating current machine comprehensive protection device; contain primary processor; auxiliary processor and power module; described primary processor and auxiliary processor interconnect; and; described power module is connected with auxiliary processor with described primary processor simultaneously; the input of described primary processor respectively with the three-phase current sampler; the switching value signal sampler of three-phase voltage sampler and light-coupled isolation is connected; the input of described auxiliary processor is connected with clock with keyboard respectively; its output is connected with the charactron display with LED light respectively, and the output of described primary processor is connected with relay.
Described primary processor is identical with auxiliary processor, is MC9S08AC16.Described LED light has seven, is respectively system power supply indicator light, run indicator, overload light, crosses thermal light, phase failure indicator light, overvoltage indicator light and under-voltage indicator light.
The invention has the beneficial effects as follows:
1, the present invention adopts primary processor and auxiliary processor to constitute dual-cpu structure; fully use its powerful operation capacity, abundant peripheral interface circuit and stronger control ability; thereby integrate multiple functions such as protection, control, improved integral working and intellectualized operation level.
2, the present invention has fully used characteristics such as the strong and rich hardware resource of single-chip microcomputer precision height, operational capability and control ability are strong; and adopt algorithm and the modular software programming technique repeatedly add up and average; menu mode operation and external control have been realized; improve the overall performance of protector, satisfied the incorporate development need of protection, measurement and control of protective relaying device.
3, Control Software of the present invention all adopts assembler language to write, and adopts module programming, thereby whole procedure has compact conformation, and the speed of service is fast, and the committed memory space is few, is easy to characteristics such as debugging and modification.
4, the present invention selects high-operational amplifier and high accuracy precision resistance for use, and constitutes the analog measurement loops in conjunction with 10 integrated A/D converters of single-chip microcomputer inside, and the three-phase current and the three-phase voltage of the motor of sampling respectively all have protection circuit advancing the chip mouth.Select for use the light-coupled isolation circuit in conjunction with external sensor signal structure outer signal sampling circuit, therefore have stronger antijamming capability, also have higher sensitivity simultaneously.Power module adopts circuits such as transformer step-down, bridge rectifier, big capacitor filtering, power protection, simply stablizes.
5, the present invention gathers multi-function in integral whole, has advantages of higher stability, repeatability and real-time; possess the inverse time lag overload protection, the starting current of hiding protection, electric current phase shortage and phase current unbalance protection; it is applied widely, has good economic benefit after the popularization.
Four. description of drawings:
Fig. 1 is the structured flowchart of alternating current machine comprehensive protection device;
Fig. 2 is the program flow diagram of alternating current machine comprehensive protection device.
Five. embodiment:
Embodiment: referring to Fig. 1-Fig. 2; among the figure; the alternating current machine comprehensive protection device contains primary processor, auxiliary processor and power module; primary processor and auxiliary processor interconnect; and; power module is connected with auxiliary processor with primary processor simultaneously; the input of primary processor is connected with the switching value signal sampler of three-phase current sampler, three-phase voltage sampler and light-coupled isolation respectively; the input of auxiliary processor is connected with clock with keyboard respectively; its output is connected with the charactron display with LED light respectively, and the output of primary processor is connected with relay.
Primary processor is identical with auxiliary processor, is MC9S08AC16.LED light has seven, is respectively system power supply indicator light, run indicator, overload light, crosses thermal light, phase failure indicator light, overvoltage indicator light and under-voltage indicator light (not drawing one by one among the figure).The system parameters that man-machine interface partly selects for use eight-digit number sign indicating number tube display to constitute the menu mode interface and make things convenient for the user to be provided with or check device in conjunction with five buttons, protection parameter, measurement data and fault message.
During work, primary processor mainly is responsible for data acquisition, calculating, control and fault judgement etc., and auxiliary processor has realized that charactron shows and the menu mode operation; its system parameters; the inquiry of each information such as protection parameter etc. and be provided with clear and intuitive, simple and clear, user interface close friend.Adopt the modular software programming technique, improved the reliability and the portability of systems soft ware, the motor that can be low pressure grade such as 380V provides effective protection and basic measurement and control.
The function that this alternating current machine comprehensive protection device is realized is based on protection, measures and be controlled to be auxilliary, and its major function is divided into:
(1) defencive function: inverse time lag overload protection, the starting current of hiding protection, electric current phase shortage and phase current unbalance protection, overvoltage protection, under-voltage protection.
(2) measurement function: three-phase current and three-phase voltage.
(3) fault self-locking and data hold function.The fault auto-lock function is convenient to analyze the action behavior of protective device, understands action reason.The automatic hold function of data is when the user sets data, and protector is remembered automatically, and use convenient next time.
(4) incoming call self-starting function and external startup, stop (resetting) function: when selecting automatic control for use, the incoming call automatic time can be arranged to the different time, avoid the multiple motors of a transformer-supplied to start simultaneously and cause the voltage range of decrease excessive.External startup stops (resetting) function, its Wiring port can be caused the guidance panel of power distribution cabinet, has increased its fail safe and operability.
(5) operational factor Presentation Function: three-phase current, the changeable demonstration of three-phase voltage make things convenient for the user to check motor operating parameter in running status.
This alternating current machine comprehensive protection device adopts voltage and current and the conduct of external sensor signal as basis for estimation, for motor provides effective protection scheme.
The inverse time lag overload protection: by the sampling over current of motor, mobile computing electric current root-mean-square value, the thermal process of coming simulated machine is according to the big or small inverse time-delay operation of electric current.
The starting current of hiding protection: in the motor starting procedure (giving tacit consent to start-up time is 3 seconds), do not do overload protection.
Phase shortage and phase current unbalance protection:, move behind the time-delay 2s when (minimum phase current/maximum phase current * 100%)＜set point.
Overvoltage protection: when the overvoltage protection value of three-phase operation voltage maximal phase voltage＞setting, by the delay time time-delay back action of setting.
Under-voltage protection: when the under-voltage protection value of the minimum phase voltage of three-phase operation voltage＜settings, move by the delay time time-delay back of setting.
The whole system program circuit as shown in Figure 2, primary processor is finished mainly that system initialization, current sample calculate, various failure judgment is handled and is carried out operation such as exchanges data with the auxiliary processor serial communication.The initialization of each module in the main finishing device of power-up initializing part (comprising the initialization of single-chip microcomputer itself, the initialization of ADC modular converter, SCI module initialization, and protection system parameter, protection parameter).The AD conversion portion comprises the three-phase current sampling, three-phase voltage sampling, and accumulation calculating.The outside connected switch test section comprises external startup, and external stop signal detects.
For improving certainty of measurement, adopt the algorithm that repeatedly adds up and average, calculate the mean value of current/voltage.Repeatedly adding up averages can effectively overcome the sampling error that causes because of external disturbance, improves sampling precision.Tested current and voltage signals amplifies through high-accuracy arithmetic, sends the AD ALT-CH alternate channel behind the filter rectification to.Adopt repeatedly sampling to add up during measurement and average, to improve certainty of measurement.
Select for use CPU (CPU) maximum operating frequency of these kind of 8 single-chip microcomputers of MC9S08AC16 of Freescale can reach 40MHZ; the highest 20MHz of system bus frequency; up to online programmable FLASH memory on the sheet of 16KB; block protection and secure option are arranged; also having nearly, the RAM of 1024B uses for user flexibility; the peripheral interface that it is abundant more selects for the user, and modular design has improved the reliability and stability of device.
Claims (3)
1. alternating current machine comprehensive protection device; contain primary processor; auxiliary processor and power module; it is characterized in that: described primary processor and auxiliary processor interconnect; and; described power module is connected with auxiliary processor with described primary processor simultaneously; the input of described primary processor respectively with the three-phase current sampler; the switching value signal sampler of three-phase voltage sampler and light-coupled isolation is connected; the input of described auxiliary processor is connected with clock with keyboard respectively; its output is connected with the charactron display with LED light respectively, and the output of described primary processor is connected with relay.
2. alternating current machine comprehensive protection device according to claim 1 is characterized in that: described primary processor is identical with auxiliary processor, is MC9S08AC16.
3. alternating current machine comprehensive protection device according to claim 1; it is characterized in that: described LED light has seven, is respectively system power supply indicator light, run indicator, overload light, crosses thermal light, phase failure indicator light, overvoltage indicator light and under-voltage indicator light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100935284A CN102195268A (en) | 2011-04-14 | 2011-04-14 | Integrated protector of alternating-current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100935284A CN102195268A (en) | 2011-04-14 | 2011-04-14 | Integrated protector of alternating-current motor |
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| CN102195268A true CN102195268A (en) | 2011-09-21 |
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| CN2011100935284A Pending CN102195268A (en) | 2011-04-14 | 2011-04-14 | Integrated protector of alternating-current motor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354954A (en) * | 2011-09-28 | 2012-02-15 | 上海久创电气自动化设备有限公司 | Motor protecting and monitoring system |
| CN102420417A (en) * | 2011-12-21 | 2012-04-18 | 芜湖天宇科技开发有限公司 | Wound type motor protector and protection method thereof |
| CN110890740A (en) * | 2019-11-11 | 2020-03-17 | 格至控智能动力科技（上海）有限公司 | Motor phase loss detection method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201402969Y (en) * | 2009-05-08 | 2010-02-10 | 珠海思创电气有限公司 | Protection device for synchronous motor |
| CN201966588U (en) * | 2011-04-14 | 2011-09-07 | 新乡市夏烽电器有限公司 | Motor protective circuit breaker |
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2011
- 2011-04-14 CN CN2011100935284A patent/CN102195268A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201402969Y (en) * | 2009-05-08 | 2010-02-10 | 珠海思创电气有限公司 | Protection device for synchronous motor |
| CN201966588U (en) * | 2011-04-14 | 2011-09-07 | 新乡市夏烽电器有限公司 | Motor protective circuit breaker |
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| 佟为明 等: "基于DSP和单片机双CPU结构的电动机综合保护器", 《低压电器》 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354954A (en) * | 2011-09-28 | 2012-02-15 | 上海久创电气自动化设备有限公司 | Motor protecting and monitoring system |
| CN102354954B (en) * | 2011-09-28 | 2014-02-05 | 上海久创电气自动化设备有限公司 | Motor protecting and monitoring system |
| CN102420417A (en) * | 2011-12-21 | 2012-04-18 | 芜湖天宇科技开发有限公司 | Wound type motor protector and protection method thereof |
| CN102420417B (en) * | 2011-12-21 | 2014-01-15 | 芜湖天宇科技开发有限公司 | Wound type motor protector and protection method thereof |
| CN110890740A (en) * | 2019-11-11 | 2020-03-17 | 格至控智能动力科技（上海）有限公司 | Motor phase loss detection method |
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Application publication date: 20110921 |