CN1964177A - Electromagnetic voltage regulation device for soft start-up of high voltage AC motor - Google Patents
Electromagnetic voltage regulation device for soft start-up of high voltage AC motor Download PDFInfo
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- CN1964177A CN1964177A CN 200510019758 CN200510019758A CN1964177A CN 1964177 A CN1964177 A CN 1964177A CN 200510019758 CN200510019758 CN 200510019758 CN 200510019758 A CN200510019758 A CN 200510019758A CN 1964177 A CN1964177 A CN 1964177A
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Abstract
The related electromagnetic voltage device for soft startup of high-voltage ac motor comprises: an electromagnetic voltage regulator, which includes a high-voltage ac winding connected with motor winding in series, a middle/low voltage control winding and a thyristor assembly to form a closed loop to control output current of the high-voltage winding for motor soft startup or stop; a fiber isolation transmission system; a digital trigger; a computer fuzzy control system; and peripheral devices (keyboard and display). This invention has well startup property and reliability, and convenient to assemble and maintenance.
Description
Affiliated technical field
The invention belongs to the flexible starter for electric motor technical field, relate to a kind of high voltage motor with soft start electromagnetic voltage adjusting device, be specially adapted to the control that electric pressure 10KV and following, power 50000KW and following high pressure cage asynchronous motor are realized level and smooth soft start or soft stop.
Background technology
At present, known high voltage motor soft start has modes such as the anti-reduced voltage starting of crosstalk, magnetic control reactance reduced voltage starting, AC frequency conversion starting, liquid resistance starting.The anti-reduced voltage starting mode of crosstalk, starting current is big, can not adjust, can't realize soft hold function; Magnetic control reactance reduced voltage starting can be adjusted starting current, can realize soft hold function, but the erecting bed needs big capacity power source, has increased construction investment, and has brought difficulty to site operation; The AC frequency conversion starting is a kind of efficient starting mode of speed regulation, and starting performance is good, speed adjustable range is big, energy-saving effect is good, but costs an arm and a leg, and the localization rate of parts and components is low, mainly by external production and import, technical sophistication, require quite high maintenance levels, be not suitable for domestic high-tension motor startup of unit; Liquid resistance starting can steplessly be controlled, starting performance is good, cheap, but the liquid resistance box volume is big, occupied ground is big, and needs regular moisturizing, is not suitable for easily freezing or the occasion of jolting, and makes, transportation, difficulty is installed, and uses and is limited to.
Summary of the invention
Purpose of the present invention is exactly to provide at above-mentioned weak point that a kind of starting performance is good, superiority of effectiveness is obvious, stepless easy-regulating, reliable, occupied ground is little, making, a kind of easily motor electromagnetism of transportation, installation, maintenance pressure regulation soft starter device, particularly a kind of electromagnetic voltage regulation device for soft start-up of high voltage AC motor, be used for high voltage motor, realize the control of level and smooth soft start or soft stop as electric pressure 10KV and following, power 50000KW and following high pressure cage asynchronous motor.
The technical solution adopted for the present invention to solve the technical problems is: a kind of electromagnetic voltage regulation device for soft start-up of high voltage AC motor, this device is by the electromagnetic voltage adjusting device, the optical fiber separating and transferring system, digital flip flop, parts such as computer mould fuzzy control system and keyboard display are formed, the electromagnetic voltage adjusting device comprises high-voltage alternating work winding, mesolow control winding and thyristor assembly, the high-voltage alternating work winding and the motor windings in series that it is characterized in that the electromagnetic voltage adjusting device, mesolow control winding and thyristor assembly compose in parallel the closed-loop path, adopt the Thyristor Controlled mode to control mesolow control winding, thereby the output current of control high-voltage alternating work winding reaches the soft start of control motor or the purpose of soft stop.
Electromagnetic voltage adjusting device described in the technology of the present invention solution, dual characteristics with magnetic voltage regulator and electronic pressure controller, but it is the combination of controlled thyristor and voltage regulating transformer, be to utilize modern power electronics technology control to trigger three groups of independently time-delay conducting electrical degrees of anti-parallel thyristor assembly, thyristor is changed between opening and turn-offing, formed the closed-loop path because of thyristor and electromagnetic voltage adjusting device mesolow control winding, changed so electromagnetic voltage adjusting device mesolow side winding also is between open circuit and short-circuit condition.Coupling takes place by magnetic circuit in two windings of electromagnetic voltage adjusting device, high pressure winding string is in the motor winding, high pressure cage asynchronous motor electromagnetic voltage adjusting soft starter device is at prestart, just applied alternating voltage on the high pressure winding, and there is alternating current to flow, thereby formation magnetomotive force, therefore in the iron core alternating flux appears, this alternating flux is by two windings, make it induce an electromotive force respectively, when thyristor is in off state, the electromagnetic voltage adjusting device is unloaded, the high pressure winding self has only very faint exciting current to flow through, this exciting current also is that the leakage reactance of voltage regulator produces, because the AC impedance of electromagnetic voltage adjusting device high-voltage alternating work winding is much larger than the AC impedance of motor winding, this moment, the high-voltage power voltage major part was applied to the high-voltage alternating work winding side of electromagnetic voltage adjusting device, the terminal voltage of motor is very little, when thyristor is opened middle the variation from turn-offing to, mesolow control winding just has secondary current to flow through, this electric current then produces a demagnetization magnetomotive force, thereby destroyed the balance that imposes between on high-tension side voltage and back electromotive force, in order to restore balance, just must draw bigger electric current a magnetomotive force that equates fully is provided from power supply, when the electric current that increases when the high-pressure side makes high-pressure side and mesolow side reach ampere-turn equilibrium, electromotive force just reaches balance, both I
1/ N
1=I
2/ N
2, formula just can be found out thus, high-pressure side N
1With mesolow side N
2The number of turn be constant, as long as changed the short circuit current I of mesolow side
2, also just changed the electric current I of high-pressure side winding
1, because of the high pressure winding and the motor windings in series of electromagnetic voltage adjusting device, also promptly changed the operating current of motor winding, soft start is become a reality.Thereby the purpose that reaches constant flow starting or start or stop by certain slope variation curve.
The technology of the present invention solution does not adopt with thyristor and directly controls motor and will add the electromagnetic voltage adjusting device, the optical fiber separating and transferring system, because the highest back-pressure of thyristor that present thyristor both domestic and external manufacturing enterprise makes can only accomplish to lie prostrate 6,000 more, motor for control 10KV and even 35KV, and the influence of consideration mains by harmonics, the back-pressure of selected thyristor must be 2.5-3 a times of electrical network rated voltage, this with regard to needs much independently thyristor connect, form the anti-parallel thyristor assembly, and the trigger impulse of every group of assembly guarantees synchronism, guarantee the several thyristors conducting simultaneously in every road, turn-off, but because the null offset phenomenon that occurs in the difference of device property and the use, at this moment inconsistent as occurring, after a thyristor damages, then domino effect can appear, puncture one by one, loss will be retrieved.Just added an actuator--electromagnetic voltage adjusting device for solving this reason between electrical network and motor, low-voltage is controlled on high-tension side voltage output in the utilization,
Digital flip flop described in the technology of the present invention solution and optical fiber separating and transferring system, be that the start pulse signal of digital flip flop is transferred to light signal by LED (light-emitting diode), by laser low light level signal is amplified again, utilize the non-conductive principle transmission pulse light signal (lightwave signal) that again can transmission signals of optical fiber, reach the purpose that mesolow and low-voltage control circuit are isolated.When optical fiber is transferred to the mesolow rear flank to lightwave signal, utilize photodiode that its light signal is converted to the signal of telecommunication again, and trigger three groups of independently time-delay conducting electrical degrees of anti-parallel thyristor, change the voltage magnitude of mesolow control winding.Because the mesolow side voltage of electromagnetic voltage adjusting device also has volt more than 2,000, consider harmonic effects, mesolow side thyristor is withstand voltage wants five kilovolts at least, stability and fail safe for taking into account system, added the optical fiber separating and transferring system, thoroughly isolated forceful electric power is to the influence of light current, the useful life and the fail safe that improve equipment.
The invention has the beneficial effects as follows: the thyristor of this device is operated in the mesolow side of electromagnetic voltage adjusting device, the difficulty of shunting dividing potential drop after having avoided thyristor because of withstand voltage needs series and parallel, and the mesolow side of electromagnetic voltage adjusting device does not need to get in addition low-tension supply yet, and make the starting end voltage of motor rise to rated voltage from zero line, the purpose that reaches constant flow starting or start or stop by certain slope variation curve.Such one is to have overcome the thyristor soft starter device under the situation of high-voltage great-current, use the thyristor string, mode in parallel requires very high to the characteristic of components and parts, and string, comparatively difficulty is all pressed in back current-sharing in parallel, make the thyristor soft start be subjected to certain circumscribed problem, as everyone knows, the thyristor of domestic production, owing to be subjected to the influence of technology and production technology, high withstand voltage thyristor be can not make, be used in and be difficult to solve string in the high pressure again, the difficulty of shunting dividing potential drop in back in parallel as unbalanced-voltage-division, then can cause pipe to puncture one by one, external product price is very high again, so the market share of thyristor soft starter device is restricted; The 2nd, overcome the problem that magnetic control reactance reduced voltage starting device needs the dc excitation power of larger capacity.This has not only increased engineering cost, also increased the loss of self, owing to adopt the size of current of DC excitation winding to change the induction reactance value of magnet controlled reactor, so it is quite serious to generate heat, this has just reduced the number of times that motor starts in short-term continuously, has also restricted the development of magnetic control reactance reduced voltage starting device simultaneously.The present invention has overcome the shortcoming of these two kinds of starting equipments and a kind of novel electromagnetic voltage adjusting soft starter device developed just.
Description of drawings
Fig. 1 is the waveform schematic diagram that control thyristor output voltage of the present invention and electric current change.
Fig. 2 is electromagnetic voltage adjusting device of the present invention and drive unit system block diagram.
Fig. 3 is the schematic diagram of flexibly starting high voltage motor of the present invention with electromagnetic voltage adjusting.
Embodiment:
Below in conjunction with accompanying drawing example of the present invention is described in further detail:
As shown in Figure 1, high pressure cage asynchronous motor electromagnetic voltage adjusting soft starter device is at prestart, thyristor is in off state, the electromagnetic voltage adjusting device is unloaded, because the AC impedance of electromagnetic voltage adjusting device high-voltage alternating work winding is much larger than the AC impedance of motor winding, this moment, the high-voltage power voltage major part was applied to the high-voltage alternating work winding side of electromagnetic voltage adjusting device, the terminal voltage of motor is very little, at motor starting computer-chronograph Fuzzy control system according to the load starting preset value, send digital start pulse signal, the time-delay electrical degree of control thyristor assembly, owing to controlled the angle of flow of thyristor, thyristor is failed full conducting, so when starting is initial, voltage, current waveform is non-sinusoidal waveform, effective value is less, thereby the starting current of motor when having controlled starting, motor is in starting process, the thyristor assembly progressively increases the angle of flow along with the variation of revolutional slip, reach fully conducting state up to the thyristor assembly, at this moment almost short circuit of the mesolow of electromagnetic voltage adjusting device control winding, the only remaining 4-5% of the impedance voltage of high-voltage alternating work winding, this moment, the high-voltage power voltage major part was applied on the motor winding, make motor starting arrive rated speed, finish the overall process of starting.
As shown in Figure 2, the primary circuit electric current is by the high-voltage alternating work winding (5) of high-pressure vacuum switch (1) to electromagnetic voltage adjusting device (8).When pressing the starting button of keyboard display (12), electromagnetic voltage adjusting device (8) is started working, the starting phase voltage is pressed setting curve to be increased, when every phase after independently anti-parallel thyristor assembly (7) is in complete conducting state, the high-pressure vacuum switch (2) that is connected in parallel on high-pressure vacuum switch (1) and electromagnetic voltage adjusting device (8) two ends is subjected to computer mould fuzzy control system (10) control, adhesive and bypass electromagnetic voltage adjusting device (8), motor starting is finished.In starting process, the secondary control loop of electromagnetic voltage adjusting device (8) is by voltage detecting (3) and current detecting (4), detected electric current, voltage signal enters computer mould fuzzy control system (10), computer mould fuzzy control system (10) is according to detected electric current, voltage signal carries out logical operation, the signal that sends is through digital trigger (9), optical fiber separating and transferring system (14), trigger the angle of flow of thyristor assembly (7), adjust the voltage effective value of low voltage control winding (6), thereby the terminal voltage of control motor (13), the soft start or the soft stop of realization motor (13).Keyboard display (12) control is put in order the start-stop of table apparatus and is shown various adjustable parameters.Control power supply (11) provides power supply to use to secondary control loop.
As shown in Figure 3, press the schematic diagram of flexibly starting high voltage motor with electromagnetic voltage adjusting, during starting, high-pressure vacuum switch (1) closure, the high-voltage alternating work winding (5) of electromagnetic voltage adjusting device (8) and motor (13) windings in series, the mesolow control winding (6) of electromagnetic voltage adjusting device (8) is formed the closed-loop path with thyristor assembly (7), ampere-turn characteristic principle according to transformer, the angle of flow that changes thyristor assembly (7) has promptly changed the short circuit current of the mesolow control winding (6) of electromagnetic voltage adjusting device (8), thereby controlled the operating current of electromagnetic voltage adjusting device (8) high-voltage alternating work winding (5), also just controlled the electric current of motor (13) winding, soft start is become a reality, after starting is finished, high-pressure vacuum switch (2) closure, high-pressure vacuum switch (1) disconnects, and electromagnetic voltage adjusting device (8) is finished starting process by bypass.
Claims (1)
- A kind of electromagnetic voltage regulation device for soft start-up of high voltage AC motor, this device is by electromagnetic voltage adjusting device (8), optical fiber separating and transferring system (14), digital flip flop (9), computer mould fuzzy control system (10) and keyboard display parts such as (12) are formed, electromagnetic voltage adjusting device (8) comprises mesolow control winding (6), high-voltage alternating work winding (5) and thyristor assembly (7), it is characterized in that: the high-voltage alternating work winding (5) of electromagnetic voltage adjusting device (8) and motor (13) windings in series, mesolow control winding (6) is formed the closed-loop path with thyristor assembly (7), adopt the Thyristor Controlled mode to control mesolow control winding (6), thereby the output current of control high-voltage alternating work winding (5) reaches the soft start of control motor (13) or the purpose of soft stop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510019758 CN1964177A (en) | 2005-11-07 | 2005-11-07 | Electromagnetic voltage regulation device for soft start-up of high voltage AC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510019758 CN1964177A (en) | 2005-11-07 | 2005-11-07 | Electromagnetic voltage regulation device for soft start-up of high voltage AC motor |
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| Publication Number | Publication Date |
|---|---|
| CN1964177A true CN1964177A (en) | 2007-05-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510019758 Pending CN1964177A (en) | 2005-11-07 | 2005-11-07 | Electromagnetic voltage regulation device for soft start-up of high voltage AC motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102480254A (en) * | 2010-11-22 | 2012-05-30 | 大禹电气科技股份有限公司 | Isolated self-excitation magnetic saturation reactor-type soft start device |
-
2005
- 2005-11-07 CN CN 200510019758 patent/CN1964177A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102480254A (en) * | 2010-11-22 | 2012-05-30 | 大禹电气科技股份有限公司 | Isolated self-excitation magnetic saturation reactor-type soft start device |
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