CN101944871A - Method for restarting electromotor after power failure - Google Patents
Method for restarting electromotor after power failure Download PDFInfo
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- CN101944871A CN101944871A CN 200910032147 CN200910032147A CN101944871A CN 101944871 A CN101944871 A CN 101944871A CN 200910032147 CN200910032147 CN 200910032147 CN 200910032147 A CN200910032147 A CN 200910032147A CN 101944871 A CN101944871 A CN 101944871A
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Abstract
The invention relates to a method for restarting an electromotor after power failure. The electromotor power failure restarting logic is divided into restarting charge, restarting discharge and restarting action, and the power failure restarting can be carried out only after the charge is finished, wherein the restarting charge has the condition that after the electromotor is in a normal running state for 0.2-1s, charge is finished; the restarting discharge has the condition that after the electromotor is powered down due to a power failure command or an internal faults, the electromotor should not be started, and if the electromotor is restarted, discharge is carried; the restarting action (begins to time) has the condition that after the restarting charge is finished, the device judges that the electromotor trips because a contactor is broken off due to interference or electricity loss, and at the moment, an electricity loss timer begins to time accumulated electricity loss time; and after the voltage recovers to a normal value, the electromotor is automatically started in batches according to preset sequence time. The invention provides a reliable and economical electromotor (group) restarting method on the basis of absorbing the experience of high-voltage line reclosing by combining with the running characteristics of a low-voltage electromotor.
Description
Technical field
The present invention relates to method and relevant control device that motor in industrial circle or motor (group) restart according to default program after system's rolling electricity or dead electricity.
Background technology
Industries such as power plant, petrochemical industry, iron and steel belong to continuity manufacturing enterprise; many motor in its low pressure station service electrical system are not allow tripping grinder in technological process; in case the crucial motor tripping grinder of this part will cause unplanned stoppage in transit, brings very big economic loss to production.But a lot of uncertain factors are arranged in actual motion; as thunderbolt, equipment fault etc.; be easy to electrical network is exerted an influence; enterprises power distribution network power supply voltage is reduced or in short-term in have no progeny and restore electricity (being referred to as rolling usually); cause the low-tension motor tripping grinder; the motor that is in the enterprises electrical network also is easy to be subjected to this to influence and causes the production pause, causes very big loss.
General AC relay is worked as voltage and is lower than 50% of coil rating voltage, and contactor discharged when the time surpassed 1 cycle (referring generally to power frequency period); When voltage is lower than 80% even higher, contactor also discharges when continuing 5 cycles.
Adopt the scheme hardware cost height of PLC (Programmable logic Controller), the wiring complexity as the self-starting cabinet.And PLC samples and arithmetic speed is not very fast.
Existing motor is restarted relay and is only depended on differentiation motor place busbar voltage and contactor auxiliary contact position to differentiate dead electricity, it is higher to restart the failure probability, following several situation is arranged: after 1, voltage recovers normally, other motor switches close a floodgate and start automatically again, and the not reaction of this motor does not have any phenomenon.2, take place under the electric long-term situation of rolling, stop and do to prepare to drive after the in-situ processing, after measure is stopped in emergency in releasing, motor generation error starting.
General generator has only a contactor, for two-speed motor or rotating motor, because two kinds of operational modes are arranged, needs to use two contactors of A, B to control the operation of motor.Contactor is meant that utilizing coil to flow through electric current produces magnetic field, makes contact closure, to reach the electrical equipment of control load.Contactor discharges and is meant that electromagnetic attraction weakens when coil voltage is low, and armature discharges under the effect of retracting spring, and contact is restored.
Summary of the invention
The objective of the invention is: provide a kind of and can determine the motor decompression and restart, and avoid the self-start method of error starting in the orderly closedown situation.
Solution of the present invention is: the motor dead electricity is restarted method, it is characterized in that: dead electricity is restarted logic and is divided into and restarts charging, restart discharge and restart action; Dead electricity is restarted and only being restarted charging and could move after finishing:
1) restart charge condition: motor charges after second at normal operating condition 0.2s～1s and finishes;
2) restart discharging condition: motor is because of halt instruction being arranged or because internal fault is shut down, should not restarting action, and restart discharge;
3) restarting action is that dead electricity is restarted the condition of (picking up counting): when restarting after charging finishes, device judges it is to cause contactor to disconnect the motor tripping operation because of rolling electricity or dead electricity, and this moment, the dead electricity timer picked up counting the accumulative total dead electricity time;
When voltage returns to " restarting voltage " when setting value is above, if the dead electricity timer time less than " restarting the time immediately " definite value, is then restarted motor immediately; If the dead electricity timer time is greater than " restarting the dead electricity time immediately " definite value, but less than " time-delay restarts the dead electricity time " definite value, then by " restarting the time-delay definite value " delayed startup motor; Voltage is not appointed recovery when surpassing " time-delay restarts the dead electricity time " definite value as the dead electricity timer time, and then motor is removed and restarted charge information, restarts discharge simultaneously, and restarts no longer action.
When satisfying simultaneously, following condition judges that motor is at normal operating condition:
1) motor current is greater than 10% rated current;
2) motor place busbar voltage is greater than " restarting voltage " setting value;
3) have only the motor of a contactor, its contactor is closing the position; Motor with two two contactors has at least a contactor closing the position.
Below any one condition satisfy time explanation motor because halt instruction is arranged or, restart and discharge because internal fault is shut down, and restart no longer action:
1) receives trip command;
2) judge motor be not because the reason of rolling electricity or brownout by orderly closedown.
When restarting after charging finishes, and following condition is when all satisfying, and judgement is to cause contactor to disconnect the motor tripping operation because of rolling electricity or dead electricity, and this moment, the dead electricity timer picked up counting the accumulative total dead electricity time:
1) electric current that flows through of motor is less than 10% motor rated current;
2) motor place busbar voltage is lower than 50% this bus rated voltage;
3) have only the motor of a contactor, its contactor is in a minute position; Generator with two contactors, two contactors are all in a minute position.
Relevant fixed value adjusting: " restarting voltage " adjusts according to 80%～90% motor rated voltage; The principle of adjusting that " restarts the time immediately ": motor is dead electricity in short-term, and rotating speed drops under 50%～90% situation of rated speed and restarts immediately, guarantees not restart immediately under rotating speed descends a lot of situations, can not cause great impact to electrical network; " time-delay restarts the dead electricity time " adjusted and started the time of spare motor into needs; Suggestion is adjusted and is the motor start-up time " to restart the time-delay definite value ".When utilizing three time differences that restart the time definite value can realize that again the motor cluster grouping restarts, one group of electronic function is finished the back at another group motor start-up and is started, and the minimizing motor start-up is to the impact of bus.
Dead electricity is restarted and can be cooperated with o-volt protection in addition, when the dead electricity time surpasses " time-delay restarts the dead electricity time " definite value, and another spare motor of o-volt protection outlet deactivation.
Advantage of the present invention: enable logic has been drawn automatic reclosing commonly used in the high pressure protective relaying device and the charge-discharge principle in the prepared auto restart, and is therefore more rigorous; Owing to adopt voltage, electric current, contactor position multicriterion, accurately discerning motor is that decompression is shut down or orderly closedown, can not cause error starting and restart miss operation.
Description of drawings
The present invention is described in more detail below in conjunction with the drawings and specific embodiments.
Fig. 1 restarts logic diagram for the dead electricity of one embodiment of the present invention
Embodiment
Method of the present invention is used for reference automatic reclosing logic theory in the high-voltage line protection, and is in conjunction with the characteristics of rolling electricity in the motor operation course, than dead electricity Restarter logic was more reasonable in the past, reliable.
Complete dead electricity is restarted logic and is divided into and restarts recharge logic, restart the discharge logic and restart action logic.Dead electricity is restarted and being had only charging could move after finishing.Logic as shown in Figure 1.
1, restart charge condition:
(1) restarts the control word input;
(2) motor current is greater than 10% rated current;
(3) motor place busbar voltage is greater than restarting the voltage definite value;
(4) (A contactor or B contactor have at least one closing the position for A, generator B) to have two contactors.
The explanation motor, was restarted charging and is finished through 0.2～0.8 second at normal operating condition when above condition all satisfied.
2, restart discharging condition:
(1) protection is moved and is tripped in motor;
(2) have outside trip command open into;
(3) the protection measure and control device works under the pure protected mode (be motor start and stop without device by external control), and it is not because shake the reason of electricity or brownout by orderly closedown that device determines motor.
More than arbitrary condition satisfy time explanation motor because halt instruction is arranged or, should not restart because internal fault is shut down, restart discharge.
3, restart action (picking up counting) condition:
(1) electric current that flows through of motor is less than 10% motor rated current;
(2) motor place busbar voltage is lower than 50% bus rated voltage;
(3) (A contactor and B contactor are all in a minute position for A, generator B) to have two contactors.
When restarting after charging finishes, and above condition is when all satisfying, and judgement is to cause contactor to disconnect the motor tripping operation because of rolling electricity or dead electricity, and this moment, the dead electricity timer picked up counting the accumulative total dead electricity time.
4, when returning to, voltage restarts the voltage setting value when above, if the dead electricity timer time less than " restarting the time immediately " definite value, then restarts motor immediately; If the dead electricity timer time is greater than " restarting the dead electricity time immediately " definite value, but less than " time-delay restarts the dead electricity time " definite value, then by " restarting the time-delay definite value " delayed startup motor; Voltage is not appointed recovery when surpassing " time-delay restarts the dead electricity time " definite value as the dead electricity timer time, and then motor is removed and restarted charge information, restarts discharge, no longer restarts.
5, restarting voltage adjusts according to 80%～90% motor rated voltage; " restart the time " principle of adjusting immediately: motor is dead electricity in short-term, and rotating speed does not descend and restarts immediately under a lot of situations, can not cause great impact to electrical network, and " time-delay restarts the dead electricity time " adjusts is the time that needs start spare motor; " restart time-delay definite value " suggestion is adjusted and is the motor start-up time, so that the motor cluster grouping is when restarting, one group of electronic function is finished the back at another group motor start-up and started, and the minimizing motor start-up is to the impact of bus
6, Zhuan Zhi dead electricity is restarted and can be cooperated with o-volt protection, exports another spare motor of deactivation by o-volt protection when the dead electricity time surpasses " time-delay restarts the dead electricity time " definite value.
Illustrate dead electricity and restart middle time fixed value adjusting: " restarting the dead electricity time immediately " fixed value adjusting is 2 seconds, and " time-delay restarts the dead electricity time " fixed value adjusting is 5 seconds, and " restarting delay time " fixed value adjusting is 2 seconds.
When motor voltage recovery in 1 second after power failure, controller is actuating motor immediately;
When motor when back 3 seconds voltage of power failure recovers, controller will recover the back 2 seconds actuating motors of delaying time at voltage;
When voltage also not recovery after 5 seconds, controller will no longer restart motor.
Claims (6)
1. the motor dead electricity is restarted method, it is characterized in that: dead electricity is restarted logic and is divided into and restarts charging, restart discharge and restart action; Dead electricity is restarted and only being restarted charging and could move after finishing:
(1) restart charge condition: motor charges after second at normal operating condition 0.2s～1s and finishes;
(2) restart discharging condition: motor is because of halt instruction being arranged or because internal fault is shut down, should not restarting action, and restart discharge;
(3) restarting action is that dead electricity is restarted the condition of (picking up counting): when restarting after charging finishes, device judges it is to cause contactor to disconnect the motor tripping operation because of rolling electricity or dead electricity, and this moment, the dead electricity timer picked up counting the accumulative total dead electricity time; When voltage returns to " restarting voltage " when setting value is above, if the dead electricity timer time less than " restarting the time immediately " definite value, is then restarted motor immediately; If the dead electricity timer time is greater than " restarting the dead electricity time immediately " definite value, but less than " time-delay restarts the dead electricity time " definite value, then by " restarting the time-delay definite value " delayed startup motor; Voltage is not appointed recovery when surpassing " time-delay restarts the dead electricity time " definite value as the dead electricity timer time, and then motor is removed and restarted charge information, restarts discharge simultaneously, and restarts no longer action.
2. the motor dead electricity is restarted method according to claim 1, it is characterized in that: judge when following condition satisfies simultaneously that motor is at normal operating condition: (1) motor current is greater than 10% rated current; (2) motor place busbar voltage is greater than " restarting voltage " setting value; (3) have only the motor of a contactor, its contactor is closing the position; Motor with two two contactors has at least a contactor closing the position.
3. the motor dead electricity is restarted method according to claim 1, it is characterized in that illustrating when following any one condition satisfies that motor is because of halt instruction being arranged or being shut down because of internal fault, restart and discharge, and restart no longer action: (1) receives trip command; (2) judge motor be not because the reason of rolling electricity or brownout by orderly closedown.
4. restart method as motor dead electricity as described in claim 1 and 2, it is characterized in that: when restart the charging finish after, and when following condition all satisfied, judgement was to cause contactor to disconnect the motor tripping operation because of rolling electricity or dead electricity, and this moment, the dead electricity timer picked up counting the accumulative total dead electricity time:
(1) electric current that flows through of motor is less than 10% motor rated current;
(2) motor place busbar voltage is lower than 50% this bus rated voltage;
(3) have only the motor of a contactor, its contactor is in a minute position; Generator with two contactors, two contactors are all in a minute position.
5. motor dead electricity as claimed in claim 1 or 2 is restarted method, it is characterized in that: " restarting voltage " adjusts according to 80%～90% motor rated voltage; The principle of adjusting that " restarts the time immediately ": motor is dead electricity in short-term, and rotating speed drops under 50%～90% situation of rated speed and restarts immediately; " time-delay restarts the dead electricity time " adjusted and started the time of spare motor into needs; Adjusting is the motor start-up time " to restart the time-delay definite value ".
6. as claim 1; 2 or 3 described motor dead electricity are restarted method; it is characterized in that: the motor dead electricity is restarted with o-volt protection cooperate, when the dead electricity time surpasses " time-delay restarts the dead electricity time " definite value, another spare motor of o-volt protection outlet deactivation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910032147 CN101944871B (en) | 2009-07-09 | 2009-07-09 | Method for restarting electromotor after power failure |
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|---|---|---|---|
| CN 200910032147 CN101944871B (en) | 2009-07-09 | 2009-07-09 | Method for restarting electromotor after power failure |
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| CN101944871A true CN101944871A (en) | 2011-01-12 |
| CN101944871B CN101944871B (en) | 2012-07-25 |
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| CN102790378A (en) * | 2011-05-20 | 2012-11-21 | 上海宝钢化工有限公司 | Intelligent motor protector and protection method thereof |
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| CN2681451Y (en) * | 2003-12-31 | 2005-02-23 | 骐成科技股份有限公司 | Multifunctional integrated control circuit device for motor |
| CN100385763C (en) * | 2005-01-19 | 2008-04-30 | 哈尔滨工业大学 | Digitallisation implementing method for ac motor heat overload protection |
| CN2810024Y (en) * | 2005-05-12 | 2006-08-23 | 张泽贵 | Starter for AC motor |
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| CN102842887B (en) * | 2011-06-20 | 2015-06-17 | 上海宝钢化工有限公司 | Anti-interference electricity protection method and anti-interference electricity protection device for electric equipment |
| CN102842887A (en) * | 2011-06-20 | 2012-12-26 | 上海宝钢化工有限公司 | Anti-interference electricity protection method and anti-interference electricity protection device for electric equipment |
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| CN104218670A (en) * | 2014-02-14 | 2014-12-17 | 南通中远川崎船舶工程有限公司 | Post-power-failure recovery and starting system for ultra-large container vessel |
| CN104863835A (en) * | 2015-04-27 | 2015-08-26 | 海南汉地阳光石油化工有限公司 | Air compressor control method and system |
| CN104863835B (en) * | 2015-04-27 | 2016-12-07 | 海南汉地阳光石油化工有限公司 | A kind of air compressor machine control method and system |
| CN105429104A (en) * | 2015-11-26 | 2016-03-23 | 江苏国网自控科技股份有限公司 | Novel low-voltage electric motor protection and electric-dazzling prevention apparatus and control method therefor |
| CN105429104B (en) * | 2015-11-26 | 2018-03-02 | 江苏国网自控科技股份有限公司 | A kind of new low-tension motor protection and Anti-electricity dazzling device and its control method |
| CN108233334A (en) * | 2016-12-22 | 2018-06-29 | 中国移动通信集团公司 | A kind of base station circuitry control method and device |
| CN110932603A (en) * | 2019-11-22 | 2020-03-27 | 北京北斗银河科技有限公司 | Control method and control device for anti-interference restarting of motor |
| CN112881788A (en) * | 2021-02-24 | 2021-06-01 | 深圳市中电软件有限公司 | Motor restarting method and system based on electric dazzling rapid identification method |
| CN112881788B (en) * | 2021-02-24 | 2022-08-02 | 深圳市中电软件有限公司 | Motor restarting method and system based on electric dazzling rapid identification method |
| CN114692065A (en) * | 2022-04-18 | 2022-07-01 | 华能辛店发电有限公司 | Method and device for calculating optimized relay protection setting value of access database and storage medium |
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| CN101944871B (en) | 2012-07-25 |
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