CN201369697Y - Device adopting capacitor to start large asynchronous motor - Google Patents
Device adopting capacitor to start large asynchronous motor Download PDFInfo
- Publication number
- CN201369697Y CN201369697Y CNU2009200319914U CN200920031991U CN201369697Y CN 201369697 Y CN201369697 Y CN 201369697Y CN U2009200319914 U CNU2009200319914 U CN U2009200319914U CN 200920031991 U CN200920031991 U CN 200920031991U CN 201369697 Y CN201369697 Y CN 201369697Y
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- asynchronous motor
- capacitor
- relay
- parallel
- contactor
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Abstract
The utility model relates to a device adopting a capacitor to start a large asynchronous motor. The device comprises a three-phase circuit and a primary capacitor connected in the three-phase circuit in parallel. The three-phase circuit of the large asynchronous motor also comprises a secondary capacitor that is connected in the three-phase circuit of the asynchronous motor in parallel; and the primary capacitor, the secondary capacitor and the three-phase circuit jointly constitute a primary circuit of the large asynchronous motor. The device adopting the capacitor to start the large asynchronous motor can obviously improve the power factor of the large asynchronous motor, save electric energy, do no pollution a power supply, be low in production cost, safe and reliable in operation and shorter in start time, and prolong the service life of the motor.
Description
Technical field
The utility model relates to a kind of device that adopts capacitor to start large-sized asynchronous motor.
Background technology
In the load of electric power system was formed, the load of asynchronous motor accounted for more than 80%, and asynchronous motor is because structural reason, and its design power factor has only 0.8.Under the static condition of asynchronous motor rotor (promptly beginning to start moment), its power factor is low to reach 0.1, needing bigger electric current when so low power factor will make asynchronous motor and its duty ratio quicken under High Power Factor, generally is 6～7 times of rated current.The starting current of large-sized asynchronous motor, the voltage of distribution system in the factory is reduced, the plant equipment that has the undervoltage trip control loop is stopped transport, high-intensity lighting device (as mercury-arc lamp Jin Shu Xiization thing lamp or high-pressure sodium lamp etc.) is extinguished, bring great potential safety hazard to normal production and living.
As everyone knows, square being directly proportional of the level of torque of motor and voltage, voltage reduces makes motor torque reduce conversely again.Torque is with not enoughly so that motor and its driving load reach due revolution little in some cases, and just asynchronous motor can not start and carry out operate as normal.Impulse current when large-sized asynchronous motor starts simultaneously will bring numerous troubles to electric power system, and it plays pendulum voltage, and influence is to other user's power supply quality.Impulse current when starting in order to limit high capacity motor, method commonly used at present are to adopt resistor, the conversion of star triangle, and reactor or autotransformer and the modes of using in recent years such as soft start limit the startup impulse current.The method of impulse current just worked when starting, and no longer works after large-sized asynchronous motor starts when but these restriction large-sized asynchronous motors started.Particularly soft start often changes the frequency of electricity consumption, and influence is disturbed the normal use of precision instrument to other user's power supply quality.
According to " Plant Engineering ", 1979, Vol 33, No8, P592～263; Disclosed technical information in P97～100 data can adopt capacitor can impel the normal operation of large-sized asynchronous motor; Daily magazine " electric calculating " 1980, No16, the method for relevant capacitor compensation large-sized asynchronous motor in the disclosed technical data in P39～43.According to above-mentioned two disclosed technical information capacitor and motor are connected in parallel in the three-phase circuit of motor together, behind capacitor compensation, motor can be started.But easy generation overcompensation produces idle refluence and brings all troubles to electric power system after starting.
The utility model content
In order to solve the above-mentioned technical problem that exists in the background technology, the utility model provides a kind of power factor that makes asynchronous motor showing raising, has saved electric energy, has not polluted power supply, low production cost, safe and reliable to operation, start-up time shorten, and the employing capacitor that prolongs motor useful life starts the device of large-sized asynchronous motor.
Technical solution of the present utility model is: the utility model provides a kind of device that adopts capacitor to start large-sized asynchronous motor, its special character is: also comprise time capacitor in the three-phase circuit of described large-sized asynchronous motor, described time capacitor is connected in parallel in the three-phase circuit of asynchronous motor; Described main capacitor, inferior capacitor and three-phase circuit are formed the primary circuit of large-sized asynchronous motor jointly.
Above-mentioned large-sized asynchronous motor also comprises the secondary circuit of may command primary circuit, and described secondary circuit is connected in parallel in the three-phase circuit of asynchronous motor.
Above-mentioned secondary circuit comprises fuse, start button, very first time relay, second time relay, auxiliary relay, first A.C. contactor, second A.C. contactor and hot coupling relay; A termination is gone into b after the described very first time relay and second time relay parallel connection, and the other end inserts a by the normally opened contact of auxiliary relay; One end of described first A.C. contactor inserts c by the normally opened contact of very first time relay, and the other end inserts b by the normally-closed contact of hot coupling relay; Described second A.C. contactor, one termination is gone into b, and the other end inserts c by the normally-closed contact of second time relay; One termination of described auxiliary relay is gone into b, and the other end inserts c; One end of one end of described start button and the second A.C. contactor normally opened contact inserts a jointly, and the other end inserts c jointly; Described a and b are connected in parallel in the three-phase circuit of asynchronous motor by fuse.
Above-mentioned secondary circuit also comprises power supply indicator, starts lamp and running indicator; Described power supply indicator is parallel to a by the normally-closed contact of first A.C. contactor; Described startup lamp is parallel to a by the normally opened contact of auxiliary relay; Described running indicator is parallel to a by the normally-closed contact of auxiliary relay and the normally opened contact of first A.C. contactor.
Above-mentioned main capacitor is the 70-80% of asynchronous motor capacity with the total capacity of time capacitor.
The ratio of above-mentioned main capacitor and time capacitor volume is 2: 1.
The utility model has the advantages that:
1, the motor power (output) factor is being shown improves.The utility model adopts capacitor to be connected in parallel in the circuit of asynchronous motor, can organically combine asynchronous motor startup and reactive power compensation on the spot, the power factor of asynchronous motor can be brought up to more than 0.97.
2, save electric energy.The utility model is owing to adopting capacitor compensation to make the rated current of asynchronous motor descend about 20%, because therefore electric energy loss just can make distribution line economize on electricity more than 5% with square being directly proportional of electric current, power savings is obvious.
3, low production cost.The utility model only is to adopt capacitor to start asynchronous motor, and is cheap.And in order to make the asynchronous motor operate as normal, when asynchronous motor moves, adopt time capacitor to cut away the part compensation, can not cause idle refluence because of overcompensation.
4, safe and reliable to operation.The utility model does not change the frequency of electricity, does not pollute power supply, can not influence the power supply quality to other user, and is safe and reliable to operation.
5, shorten start-up time, prolong motor useful life.The utility model improves the terminal voltage of asynchronous motor owing to adopt time capacitor to work with main capacitor, because of square being directly proportional of staring torque copper voltage, can make asynchronous motor shorten 3～4 seconds start-up time; Because the minimizing of start-up time can effectively reduce mechanical wear, prolong the useful life of asynchronous motor simultaneously.
Description of drawings
Fig. 1 starts the circuit theory schematic diagram of large-sized asynchronous motor for the utility model.
Embodiment.
Referring to Fig. 1, the utility model provides a kind of device that adopts capacitor to start large-sized asynchronous motor, the main capacitor 1 that comprises three-phase circuit and be connected in parallel on three-phase circuit, also comprise time capacitor 3 in the three-phase circuit of this large-sized asynchronous motor, inferior capacitor 3 is connected in parallel in the three-phase circuit of asynchronous motor 2; Main capacitor 1, inferior capacitor 3 and three-phase circuit are formed the primary circuit of large-sized asynchronous motor 2 jointly.This large-sized asynchronous motor 2 also comprises the secondary circuit of may command primary circuit, and secondary circuit is connected in parallel in the three-phase circuit of asynchronous motor 2.
Secondary circuit comprises fuse FU, start button SB2, very first time relay K T1, second time relay KT2, auxiliary relay KA, the first A.C. contactor QM1, the second A.C. contactor QM2 and hot coupling relay K H; A termination is gone into b after the very first time relay K T1 and second time relay KT2 parallel connection, and the other end inserts a by the normally opened contact of auxiliary relay KA; The end of the first A.C. contactor QM1 inserts c by the normally opened contact of very first time relay K T1, and the other end inserts b by the normally-closed contact of hot coupling relay K H; The second A.C. contactor QM2, one termination is gone into b, and the other end inserts c by the normally-closed contact of second time relay KT2; The termination of auxiliary relay KA is gone into b, and the other end inserts c; One end of the end of start button SB2 and the second A.C. contactor QM2 normally opened contact inserts a jointly, and the other end inserts c jointly; A and b are connected in parallel in the three-phase circuit of asynchronous motor 2 by fuse FU.In addition, the utility model also comprises power supply indicator at the secondary circuit that is provided, starts lamp and running indicator for more convenient use; Power supply indicator is parallel to a by the normally-closed contact of the first A.C. contactor QM1; The startup lamp is parallel to a by the normally opened contact of auxiliary relay KA; Running indicator is parallel to a by the normally-closed contact of auxiliary relay KA and the normally opened contact of the first A.C. contactor QM1.
Inventor of the present utility model is engaged in the experience that electric power system work is accumulated for a long time, and the principle that can draw the capacitor outfit is: the 70-80% according to asynchronous motor 2 capacity is equipped with capacitor.And the ratio of the capacity of main capacitor 1 and time capacitor 3 is 2: 1.
Capacitor startup large-sized asynchronous motor 2 circuit diagrams and control principle are as follows:
When threephase asynchronous 2 needs to start, air switch QF closes, the major loop first A.C. contactor QM1, the second A.C. contactor QM2 upper contact (fixed contact) and secondary circuit are all charged at this moment, power supply indicator is bright, press start button start button SB2, the control power supply by L1 through air switch QF, fuse FU, stop the first button SB1, divide two-way after starting start button SB2:
One the tunnel through second time relay Time Delay Opening contact KT2, the second ac contactor coil QM2, fuse FU, air switch QF, get back to power supply L3, second A.C. contactor QM2 adhesive and the self-locking;
Another road through auxiliary relay coil KA, fuse FU, air switch QF, get back to power supply L3, auxiliary relay KA adhesive and self-locking.KA normally opened contact closure, very first time relay K T1 and the charged adhesive of second time relay KT2 coil.
After the second A.C. contactor QM2 adhesive, start time capacitor 3 and put into operation, behind charging 0.5～2s, behind the very first time relay K T1 delay time, the timing closing of KT1 contact, first charged adhesive of A.C. contactor QM1 coil and the self-locking, three-phase asynchronous electric begins to start.
The first A.C. contactor QM1 normally-closed contact disconnects in the secondary circuit, and power supply indicator goes out.Auxiliary relay KA normally opened contact closure, it is bright to start indicator light.
Start 8～12s, behind second time relay KT2 delay time, releases of cut off the power supply of KT2 contact Time Delay Opening, the second ac contactor coil QM2, the QM2 normally opened contact disconnects, and the inferior capacitor 3 of startup is out of service.The auxiliary relay coil KA release of cutting off the power supply, the KA normally opened contact disconnects, very first time relay K T1, second time relay KT2 coil blackout discharges.Signal indication in the secondary circuit is: auxiliary relay KA normally-closed contact recovers closed, and run indicator is bright, and auxiliary relay KA normally opened contact disconnects, and starts indicator light and goes out, and threephase asynchronous 2 starts and finishes.That is to say, the utility model is when work, at first carry out work by inferior capacitor 3, after to be charged the finishing, work with main capacitor 1, large-sized asynchronous motor 2 is started, after motor 2 starts, inferior capacitor 3 can be utilized function excision time lag of second time relay KT2, make motor 2 run well.
The utility model provides time capacitor 3 after startup is finished, and by secondary circuit it is excised, and has avoided all drawbacks that cause because compensation is excessive when normal operation.Its excision step is to add second time relay KT2 in secondary circuit, the time of this second time relay KT2 can be set at 8～12 seconds, excision automatically after running reaches rated revolution, the main capacitor 1 that does not have excision is then with asynchronous motor 2 operations.The control appliance of excision capacitor, the high-voltage capacitor of 6～10kv adopts vacuum circuit-breaker; 0.4kv following secondary capacitor adopts the AC relay that is complementary with condenser capacity.
Illustrate as follows: if the capacity of asynchronous motor 2 is 240kw, power factor 0.8, reactive power=240 * 0.6/0.8=180kva.r, rated current=240/ (1.732 * 0.4 * 0.8)=443A is equipped with capacitor=240 * 2/3=180kva.r.Excision capacity=180 * 1/3=60kva.r after startup reaches rated revolution, remaining 2/3 capacitor 120kva.r, reactive power is 60kva.r when running well.Power factor is 0.97.Rated current=240/ (1.732 * 0.4 * 0.97)=357A, electric current decline 86A, electric current rate of descent 19.4%.
Claims (6)
1, a kind of device that adopts capacitor to start large-sized asynchronous motor, the main capacitor that comprises three-phase circuit and be connected in parallel on three-phase circuit, it is characterized in that: also comprise time capacitor in the described large-sized asynchronous motor three-phase circuit, described time capacitor is connected in parallel in the three-phase circuit of asynchronous motor; Described main capacitor, inferior capacitor and three-phase circuit are formed the primary circuit of large-sized asynchronous motor jointly.
2, employing capacitor according to claim 1 starts the device of large-sized asynchronous motor, it is characterized in that: described large-sized asynchronous motor also comprises the secondary circuit of may command primary circuit, and described secondary circuit is connected in parallel in the three-phase circuit of asynchronous motor.
3, employing capacitor according to claim 2 starts the device of large-sized asynchronous motor, and it is characterized in that: described secondary circuit comprises fuse, start button, very first time relay, second time relay, auxiliary relay, first A.C. contactor, second A.C. contactor and hot coupling relay; A termination is gone into b after the described very first time relay and second time relay parallel connection, and the other end inserts a by the normally opened contact of auxiliary relay; One end of described first A.C. contactor inserts c by the normally opened contact of very first time relay, and the other end inserts b by the normally-closed contact of hot coupling relay; Described second A.C. contactor, one termination is gone into b, and the other end inserts c by the normally-closed contact of second time relay; One termination of described auxiliary relay is gone into b, and the other end inserts c; One end of one end of described start button and the second A.C. contactor normally opened contact inserts a jointly, and the other end inserts c jointly; Described a and b are connected in parallel in the three-phase circuit of asynchronous motor by fuse.
4, employing capacitor according to claim 3 starts the device of large-sized asynchronous motor, it is characterized in that: described secondary circuit also comprises power supply indicator, starts lamp and running indicator; Described power supply indicator is parallel to a by the normally-closed contact of first A.C. contactor; Described startup lamp is parallel to a by the normally opened contact of auxiliary relay; Described running indicator is parallel to a by the normally-closed contact of auxiliary relay and the normally opened contact of first A.C. contactor.
5, according to the device of claim 1 or 2 or 3 or 4 described employing capacitors startup large-sized asynchronous motors, it is characterized in that: described main capacitor is the 70-80% of asynchronous motor capacity with the total capacity of time capacitor.
6, employing capacitor according to claim 5 starts the device of large-sized asynchronous motor, it is characterized in that: the ratio of described main capacitor and time capacitor volume is 2: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200319914U CN201369697Y (en) | 2009-02-24 | 2009-02-24 | Device adopting capacitor to start large asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200319914U CN201369697Y (en) | 2009-02-24 | 2009-02-24 | Device adopting capacitor to start large asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201369697Y true CN201369697Y (en) | 2009-12-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CNU2009200319914U Expired - Fee Related CN201369697Y (en) | 2009-02-24 | 2009-02-24 | Device adopting capacitor to start large asynchronous motor |
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| CN (1) | CN201369697Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103064021A (en) * | 2011-10-18 | 2013-04-24 | 台达电子企业管理（上海）有限公司 | Measuring equipment and method of induction motor excitation parameter |
| CN105375825A (en) * | 2015-11-11 | 2016-03-02 | 国网黑龙江省电力有限公司管理培训中心 | Control apparatus for motor safe startup |
| CN105429513A (en) * | 2015-12-21 | 2016-03-23 | 江苏省镇江船厂（集团）有限公司 | Marine electric motor starting compensation apparatus |
| CN106785949A (en) * | 2017-01-18 | 2017-05-31 | 江苏泽锦新能源科技有限公司 | A kind of method that automatic recovery feeder box becomes |
| CN104065051B (en) * | 2014-06-26 | 2017-06-13 | 许继电气股份有限公司 | A kind of transformer inrush current suppression apparatus suitable for the frequent unloaded input of testing transformer |
| US11101751B2 (en) | 2017-04-06 | 2021-08-24 | Carrier Corporation | Method for reducing the inrush current of an asynchronous electrical motor and a compressor system for implementing this method |
-
2009
- 2009-02-24 CN CNU2009200319914U patent/CN201369697Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103064021A (en) * | 2011-10-18 | 2013-04-24 | 台达电子企业管理（上海）有限公司 | Measuring equipment and method of induction motor excitation parameter |
| CN103064021B (en) * | 2011-10-18 | 2015-12-09 | 台达电子企业管理（上海）有限公司 | The measurement mechanism of induction motor excitation parameter and method |
| US9435864B2 (en) | 2011-10-18 | 2016-09-06 | Delta Electronics (Shanghai) Co., Ltd | Apparatus for measuring excitation parameters of induction motor and method thereof |
| CN104065051B (en) * | 2014-06-26 | 2017-06-13 | 许继电气股份有限公司 | A kind of transformer inrush current suppression apparatus suitable for the frequent unloaded input of testing transformer |
| CN105375825A (en) * | 2015-11-11 | 2016-03-02 | 国网黑龙江省电力有限公司管理培训中心 | Control apparatus for motor safe startup |
| CN105375825B (en) * | 2015-11-11 | 2018-03-23 | 国网黑龙江省电力有限公司 | The control device that motor safety starts |
| CN105429513A (en) * | 2015-12-21 | 2016-03-23 | 江苏省镇江船厂（集团）有限公司 | Marine electric motor starting compensation apparatus |
| CN106785949A (en) * | 2017-01-18 | 2017-05-31 | 江苏泽锦新能源科技有限公司 | A kind of method that automatic recovery feeder box becomes |
| US11101751B2 (en) | 2017-04-06 | 2021-08-24 | Carrier Corporation | Method for reducing the inrush current of an asynchronous electrical motor and a compressor system for implementing this method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091223 Termination date: 20110224 |