CN204906232U - Three -phase asynchronous motor reduced -voltage starting and operation reactive compensation circuit - Google Patents
Three -phase asynchronous motor reduced -voltage starting and operation reactive compensation circuit Download PDFInfo
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- CN204906232U CN204906232U CN201520547597.1U CN201520547597U CN204906232U CN 204906232 U CN204906232 U CN 204906232U CN 201520547597 U CN201520547597 U CN 201520547597U CN 204906232 U CN204906232 U CN 204906232U
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- auxiliary contact
- contactor
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- switch
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Control Of Ac Motors In General (AREA)
Abstract
The utility model discloses a three -phase asynchronous motor reduced -voltage starting and operation reactive compensation circuit, it comprises main circuit and control circuit, the main circuit comprises operation circuit, reactive compensation circuit and step -down starting circuit, control circuit includes time relay, ac contactor, switching formula electric capacity contactor, electrothermal relay auxiliary contact FR1 -1, electrothermal relay auxiliary contact FR2 -1, normally closed switch SB1, inching switch SB2, ac contactor's the normal close auxiliary contact KT1 who normally opens auxiliary contact KM1 -1, time relay, normally closed switch SB1's one end is connected on live wire L1, the other end and inching switch SB2 are connected, inching switch SB2 connects the coil input at time relay and ac contactor simultaneously. The utility model discloses can be simpler carry out the motor reduced -voltage starting, make the capacity of power supply unit obtain abundant utilization, that plays bigger degree falls damage, energy -conservation, economic benefits is showing more.
Description
Technical field
The utility model relates to a kind of reduced-voltage starting and runs reactive power compensation circuit, particularly relates to a kind of Three-phase Asynchronous Motor start-up and functionning reactive power compensation circuit.
Background technology
Due to motor total head directly start time: surge (impact) electric current up to 4 ~ 7 times, Rated motor electric current will be produced, the switchgear of electric power system and series connection is transshipped.On the other hand, directly start, also can produce higher peak torque, this impact not only can produce drive motor to be impacted, and mechanical device can be made impaired; Also affecting and be connected on other electric equipments on same electrical network and normally work, in order to improve the automaticity of equipment, improving the reliability and safety of equipment, require that high power motor adopts reduced-voltage starting mode, reduced-voltage starting mode conventional is at present as follows:
1, star angle Starting mode
During stator winding Y-connection, stator voltage reduce to triangle connect
the starting current provided by power supply is only for 1/3 when stator winding triangle connects, starting current is about the 2-3 of rated current doubly, reduction starting current that just can be larger, but square to be directly proportional due to detent torque and every phase winding voltage, winding voltage during star connection reduces
doubly, so detent torque will drop to 1/3 of delta connection, moment transmission will be poor, and strength is too little cannot heavy load starting, makes utilization limited.
2, soft start
Although soft initiator can realize step-down and current-limited startup, start comparatively steady, less to the impact of motor and plant equipment; defencive function is comprehensive; automaticity is higher, can realize Long-distance Control, is applicable to all zero loads, underloading asynchronous motor uses; shortcoming: keep in repair more difficult; invest higher, higher to the environmental requirement used, electronic original part overload capacity is lower; and starting torque is little, be not suitable for the large-size machine of heavy load starting.
3) variable frequency starting
Frequency converter can make motor with less starting current, and obtain larger detent torque, namely frequency converter can start load duty.But expensive, maintenance requirement is also very high.
Utility model content
In order to the weak point in solving the problem, the utility model provides a kind of Three-phase Asynchronous Motor start-up and functionning reactive power compensation circuit.
In order to solve above technical problem, the technical solution adopted in the utility model is: a kind of Three-phase Asynchronous Motor start-up and functionning reactive power compensation circuit, and it is made up of main circuit and control circuit; Main circuit forms by running circuit, reactive power compensation circuit and reduced-voltage starting circuit;
Control circuit comprises the normally closed auxiliary contact KT1 often opening auxiliary contact KM1-1, the time relay of the time relay, A.C. contactor, switching type capacitor contactor, thermal relay auxiliary contact FR1-1, thermal relay auxiliary contact FR2-1, normally closed switch SB1, point driving switch SB2, A.C. contactor;
One end of normally closed switch SB1 is connected on live wire L1, the other end is connected with point driving switch SB2; Point driving switch SB2 is connected to the coil input end of the time relay and A.C. contactor simultaneously; The coil output of the time relay and A.C. contactor is all connected on thermal relay auxiliary contact FR1-1; Thermal relay auxiliary contact FR1-1 is connected with thermal relay auxiliary contact FR2-1, and the lead-out wire of thermal relay auxiliary contact FR2-1 is connected on live wire L2;
A.C. contactor often open the two ends that auxiliary contact KM1-1 is connected to point driving switch SB2; The auxiliary contact KM1-1 that often opens of A.C. contactor is connected on the normally closed auxiliary contact KT1 of the time relay; The normally closed auxiliary contact KT1 of the time relay is connected to the coil input end of switching type capacitor contactor; The coil output of switching type capacitor contactor is connected with the coil output of A.C. contactor.
Run circuit and comprise protection switch QS; One end of protection switch QS is connected on live wire L1, live wire L2 and live wire L3;
Reactive power compensation circuit 4 is provided with electric capacity C2, three binding posts of electric capacity C2 are connected between the main contacts FR1-2 often driving auxiliary contact KM1-2 and thermal relay of contactor I.
The other end of protection switch QS is connected with the auxiliary contact KM1-2 that often opens of A.C. contactor; The lead-out wire often opening auxiliary contact KM1-2 of A.C. contactor is connected on thermal relay main contacts FR1-2, and the lead-out wire of thermal relay main contacts FR1-2 is connected in motor M.
Three binding posts of electric capacity C2 are drawn three electric wires and are connected with the auxiliary contact KM2 that often opens of switching type capacitor contactor; One end of often opening auxiliary contact KM2 of described switching type capacitor contactor is connected with the auxiliary contact FR2-2 of thermal relay, and the lead-out wire of the auxiliary contact FR2-2 of thermal relay is connected on three binding posts of electric capacity C1.
The utility model more simply can carry out electric machine step-down starting, and effectively can compensate reactive power when switching to running status, capacitor drops into electric motor starting simultaneously, the reactive power consumption part of motor itself is made to carry out local compensation, thus make more than mounting points become the idle reduction of distribution line conveying, the capacity of power supply unit is fully utilized, and play and fall damage, energy-conservation greatly, economic benefit is more remarkable.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Embodiment
As shown in Figure 1, the utility model is made up of main circuit 1 and control circuit 2; Main circuit 1 is made up of operation circuit 3, reactive power compensation circuit 4 and reduced-voltage starting circuit 5.
Control circuit 2 comprises the normally closed auxiliary contact KT1 often opening auxiliary contact KM1-1, the time relay of the time relay 6, A.C. contactor 7, switching type capacitor contactor 8, thermal relay auxiliary contact FR1-1, thermal relay auxiliary contact FR2-1, normally closed switch SB1, point driving switch SB2, A.C. contactor.
One end of normally closed switch SB1 is connected on live wire L1, the other end is connected with point driving switch SB2.Point driving switch SB2 is connected to the coil input end of the time relay 6 and A.C. contactor 7 simultaneously.The coil output of the time relay 6 and A.C. contactor 7 is all connected on thermal relay auxiliary contact FR1-1; Thermal relay auxiliary contact FR1-1 is connected with thermal relay auxiliary contact FR2-1, and the lead-out wire of thermal relay auxiliary contact FR2-1 is connected on live wire L2.
A.C. contactor often open the two ends that auxiliary contact KM1-1 is connected to point driving switch SB2.The auxiliary contact KM1-1 that often opens of A.C. contactor is connected on the normally closed auxiliary contact KT1 of the time relay.The normally closed auxiliary contact KT1 of the time relay is connected to the coil input end of switching type capacitor contactor 8.The coil output of switching type capacitor contactor 8 is connected with the coil output of A.C. contactor 7.
Run circuit 3 and comprise protection switch QS.One end of protection switch QS is connected on live wire L1, live wire L2 and live wire L3, and the other end of protection switch QS is connected with the auxiliary contact KM1-2 that often opens of A.C. contactor.The lead-out wire often opening auxiliary contact KM1-2 of A.C. contactor is connected on thermal relay main contacts FR1-2, and the lead-out wire of thermal relay main contacts FR1-2 is connected in motor M.
Reactive power compensation circuit 4 is provided with electric capacity C2, three binding posts of electric capacity C2 are connected between the main contacts FR1-2 often driving auxiliary contact KM1-2 and thermal relay of contactor I.Three binding posts of electric capacity C2 are drawn three electric wires and are connected with the auxiliary contact KM2 that often opens of switching type capacitor contactor.One end of often opening auxiliary contact KM2 of switching type capacitor contactor is connected with the auxiliary contact FR2-2 of thermal relay, and the lead-out wire of the auxiliary contact FR2-2 of thermal relay is connected on three binding posts of electric capacity C1.
Operation principle:
Reduced-voltage starting circuit and reactive power compensation circuit:
Reduced-voltage starting circuit: press protection switch QS, motor switch SB2, the time relay 6 in control circuit 2 and A.C. contactor 7 are also energized; Now, because A.C. contactor 7 obtains electric, A.C. contactor in control circuit 2 often open auxiliary contact KM1-1 from often open become closed, self-locking is carried out to control circuit 2, make the A.C. contactor in operation circuit 3 often open auxiliary contact KM1-2 from often open become closed, run circuit 3 electric, now, motor M start start, three-phase self-healing low-voltage parallel running capacitor C2 also electric operation; And because of the time relay 6 electric, so the normally closed auxiliary contact KT1 of the time relay is energized and connects circuit, make the switching type capacitor contactor 8 in control circuit 2 electric.
Switching type capacitor contactor 8 electric, in reduced-voltage starting circuit 5, the auxiliary contact KM2 that often opens of switching type capacitor contactor becomes closed from often opening, and connects three-phase self-healing low-voltage start-up capacitance C1 in parallel.Therefore when motor M starts, synchronous averaging reduced-voltage starting circuit (three-phase self-healing low-voltage start-up capacitance C1 in parallel devotes oneself to work) and reactive power compensation circuit (three-phase self-healing low-voltage parallel running electric capacity C2 devotes oneself to work), thus reducing the starting current of motor M, lower starting current realizes heavy load starting.
Reactive power compensation circuit: motor is switched to normal operation by startup, the time relay 6 arrives Preset Time, the normally closed auxiliary contact KT1 of the time relay in control circuit 2 becomes disconnection from closed, switching type capacitor contactor 8 power-off, therefore in reduced-voltage starting circuit 5, the auxiliary contact KM2 that often opens of switching type capacitor contactor becomes disconnection from closed, reduced-voltage starting down circuitry, start-up capacitance C1 in parallel for three-phase self-healing low-voltage is disconnected, only leave three-phase self-healing low-voltage parallel running electric capacity C2, (the operation capacitor of values match must be incorporated to herein, the most effectively improve power factor, ) make the reactive loss part of motor itself obtain local compensation, thus make more than mounting points become the idle reduction of distribution line conveying.
Three-phase self-healing low-voltage start-up capacitance C1 in parallel uses calculation of capacity:
I＝P*2.67
I: the rated current of capacitor
P: power of motor
Finally according to the rated current calculated, carry out capacitor type selecting.
Such as: the motor of 90KW, be multiplied by 2.67, calculate 240.3, so select current values close to the capacitor of 240.3A, as reduced-voltage starting electric capacity.
Motor carries out reactive power compensation, install in electrical network after the reactive-load compensation equipments such as shunt capacitance, the reactive power that inductive load consumes can be provided, decrease the reactive power that electric network source provides to inductive load, carried by circuit, owing to decreasing the flowing of reactive power in electrical network, therefore can reduce low voltage electric network line loss, improve quality of voltage, improve distribution transforming power supply capacity.But choosing of shunt capacitance is that needs are moderate, otherwise value is large or little, idle waste is caused in capital, by the electric capacity that native system is matched, can by needed for motor all reactive power give suitable compensation, as power factor brings up to 0.9 by 0.7 before compensating, make reactive power compensation obtain maximum compensation, compare other reactive power compensations, compensation depth is large and effectively.
Three-phase self-healing low-voltage parallel running electric capacity C2 uses calculation of capacity:
I＝P*0.9
I: the rated current of capacitor
P: power of motor
Finally according to the rated current calculated, carry out capacitor type selecting.
Such as: the motor of 90KW, be multiplied by 0.9, calculate 81, so select current values close to the capacitor of 81A, as reactive compensation capacitor during operation.
Compared with prior art, the present invention has following beneficial effect:
Pass through the present invention, reduced-voltage starting, only need very simple element to obtain less starting current, there is larger torque, improve the capacity of motor, directly can carry out heavily loaded electric machine step-down starting, start in the normal process switched realize very level and smooth excessive, and start-up capacitance in start-up course and the value running electric capacity, very important, according to calculating, heavily loaded motor smooth starting will be dragged within the extremely short time.
The utility model integrates auto-coupling voltage-reduction starting, star delta reduced-voltage starting, soft start function, make motor start to normal operating condition can be excessive stably, for electrical network adds power capacity, be that circuit reduces non-power consumption loss, reduce costs.
Above-mentioned execution mode is not to restriction of the present utility model; the utility model is also not limited in above-mentioned citing; the change that those skilled in the art make within the scope of the technical solution of the utility model, remodeling, interpolation or replacement, also all belong to protection range of the present utility model.
Claims (2)
1. a Three-phase Asynchronous Motor start-up and functionning reactive power compensation circuit, is characterized in that: it is made up of main circuit (1) and control circuit (2); Main circuit (1) is made up of operation circuit (3), reactive power compensation circuit (4) and reduced-voltage starting circuit (5);
Described control circuit (2) comprises the normally closed auxiliary contact KT1 often opening auxiliary contact KM1-1, the time relay of the time relay (6), A.C. contactor (7), switching type capacitor contactor (8), thermal relay auxiliary contact FR1-1, thermal relay auxiliary contact FR2-1, normally closed switch SB1, point driving switch SB2, A.C. contactor;
One end of described normally closed switch SB1 is connected on live wire L1, the other end is connected with point driving switch SB2; Point driving switch SB2 is connected to the coil input end of the time relay (6) and A.C. contactor (7) simultaneously; The coil output of the described time relay (6) and A.C. contactor (7) is all connected on thermal relay auxiliary contact FR1-1; Thermal relay auxiliary contact FR1-1 is connected with thermal relay auxiliary contact FR2-1, and the lead-out wire of thermal relay auxiliary contact FR2-1 is connected on live wire L2;
Described A.C. contactor often open the two ends that auxiliary contact KM1-1 is connected to point driving switch SB2; The auxiliary contact KM1-1 that often opens of A.C. contactor is connected on the normally closed auxiliary contact KT1 of the time relay; The normally closed auxiliary contact KT1 of the described time relay is connected to the coil input end of switching type capacitor contactor (8); The coil output of described switching type capacitor contactor (8) is connected with the coil output of A.C. contactor 7;
Described operation circuit (3) comprises protection switch QS; One end of described protection switch QS is connected on live wire L1, live wire L2 and live wire L3;
(4) are provided with electric capacity C2 to described reactive power compensation circuit, and three binding posts of electric capacity C2 are connected between the main contacts FR1-2 often driving auxiliary contact KM1-2 and thermal relay of contactor I.
2. Three-phase Asynchronous Motor start-up and functionning reactive power compensation circuit according to claim 1, is characterized in that: the other end of described protection switch QS is connected with the auxiliary contact KM1-2 that often opens of A.C. contactor; The lead-out wire often opening auxiliary contact KM1-2 of described A.C. contactor is connected on thermal relay main contacts FR1-2, and the lead-out wire of thermal relay main contacts FR1-2 is connected in motor M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520547597.1U CN204906232U (en) | 2015-07-28 | 2015-07-28 | Three -phase asynchronous motor reduced -voltage starting and operation reactive compensation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520547597.1U CN204906232U (en) | 2015-07-28 | 2015-07-28 | Three -phase asynchronous motor reduced -voltage starting and operation reactive compensation circuit |
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| Publication Number | Publication Date |
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| CN204906232U true CN204906232U (en) | 2015-12-23 |
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| CN201520547597.1U Expired - Fee Related CN204906232U (en) | 2015-07-28 | 2015-07-28 | Three -phase asynchronous motor reduced -voltage starting and operation reactive compensation circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380649A (en) * | 2019-07-26 | 2019-10-25 | 六盘水金星机电设备有限公司 | A kind of energy-saving soft start cabinet |
| RU2793623C1 (en) * | 2022-08-11 | 2023-04-04 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный технологический университет" (ФГБОУ ВО "КубГТУ") | Non-reversible control circuit of self-braking asynchronous electric motor with shifting squirrel-cage rotor |
-
2015
- 2015-07-28 CN CN201520547597.1U patent/CN204906232U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380649A (en) * | 2019-07-26 | 2019-10-25 | 六盘水金星机电设备有限公司 | A kind of energy-saving soft start cabinet |
| RU2793623C1 (en) * | 2022-08-11 | 2023-04-04 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный технологический университет" (ФГБОУ ВО "КубГТУ") | Non-reversible control circuit of self-braking asynchronous electric motor with shifting squirrel-cage rotor |
| RU2796580C1 (en) * | 2022-08-11 | 2023-05-25 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный технологический университет" (ФГБОУ ВО "КубГТУ") | Non-reversible control circuit of self-braking asynchronous electric motor with shifting squirrel-cage rotor |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151223 Termination date: 20170728 |
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| CF01 | Termination of patent right due to non-payment of annual fee |