CN211296597U - Full-voltage direct starting device of low-voltage alternating-current motor - Google Patents
Full-voltage direct starting device of low-voltage alternating-current motor Download PDFInfo
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- CN211296597U CN211296597U CN201921978548.8U CN201921978548U CN211296597U CN 211296597 U CN211296597 U CN 211296597U CN 201921978548 U CN201921978548 U CN 201921978548U CN 211296597 U CN211296597 U CN 211296597U
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Abstract
The utility model discloses a low pressure alternating current motor's direct starting drive of total pressure, including mutual-inductor (1), automatically regulated parameter reactive compensation controller (2), anti harmonious shape intelligent capacitor (3), time relay KT1, motor A (4), mutual-inductor (1) and automatically regulated parameter reactive compensation controller (2) are established ties, automatically regulated parameter reactive compensation controller (2) and anti harmonious shape intelligent capacitor (3) are established ties, automatically regulated parameter reactive compensation controller (2) are connected with the power, be equipped with time relay KT1 on the circuit of being connected with motor A (4), be equipped with circuit breaker QS1 on the circuit that low pressure filtering intelligent capacitor (3) and power are connected, respectively series connection alternating current contactor KM1 and circuit breaker QS2 on the circuit that motor A (4) and power are connected in proper order. The utility model discloses start fast, the pick-up current is little, and system stability is high, can effectively reduce the energy consumption.
Description
Technical Field
The utility model relates to a motor impedance transformation technical field, concretely relates to low pressure alternating current motor's full pressure direct start's device.
Background
With the rapid development of modern industry, low-voltage (1000V and below) high-power motors are applied more and more in various industries, the starting current of the high-power motor is very large when the high-power motor is directly started, generally 5-7 times of the rated current of the motor (the large currents are almost all from a power supply), the large current can cause great impact to a customer power grid and even breakdown of the power grid, in order to reduce the impact to the power grid when the high-power motor is started, and to deal with the problems, the domestic and foreign continous utility model discloses methods of self-coupling starting, star-delta starting, soft starter starting, frequency converter starting and the like for starting the high-power motor, the methods all adopt a voltage reduction starting mode, namely, the loading voltage at two ends of the motor is reduced when the motor is started, so that the current required when the high-power motor is started is reduced, because the motor torque is in, the starting torque of the motor is reduced during the voltage reduction starting, the starting is still very difficult under the conditions of medium and heavy loads, the starting time is dozens of seconds or even minutes, the voltage drop is overlarge, and the accidents of grid breakdown caused by the fusing of a high-voltage fusible core, the tripping of a breaker and the like can be caused by the long-time continuous large current.
The large current when the motor starts is composed of active current, reactive current, harmonic and inrush current, the rotor starts to rotate slowly when the motor starts, at the moment, the large reactive current is mainly needed to generate an induction magnetic field to drive the rotor of the motor to rotate, the active current is very low, the active current is gradually increased to drive the motor to rotate along with the increase of the rotating speed of the motor, the reactive current is rapidly reduced, after the motor starts, the reactive current is reduced to the minimum, the current is mainly based on the active current, the highest proportion of the reactive current reaches 65%, and the harmonic and the inrush current generated when the motor starts can increase the current when the motor starts.
Disclosure of Invention
An object of the utility model is to overcome above-mentioned shortcoming and the start-up that provides is fast, and starting current is little, and system stability is high, can effectively reduce the low pressure alternating current motor's of energy consumption direct starting drive of total pressure.
The utility model discloses a low pressure alternating current motor's direct starting drive of total pressure, including the mutual-inductor, automatically regulated parameter reactive compensation controller, anti harmonious shape intelligent capacitor, time relay KT1, motor A, the mutual-inductor is established ties with automatically regulated parameter reactive compensation controller, automatically regulated parameter reactive compensation controller establishes ties with anti harmonious shape intelligent capacitor, automatically regulated parameter reactive compensation controller is connected with the power, be equipped with time relay KT1 on the circuit of being connected with motor A, be equipped with circuit breaker QS1 on the circuit of anti harmonious shape intelligent capacitor and power connection, respectively series connection alternating current contactor KM1 and circuit breaker QS2 in proper order on the circuit that motor A and power are connected.
The full-voltage direct starting device of the low-voltage alternating-current motor comprises: the harmonic-resistant intelligent capacitor automatically changes the switching delay parameter of the controller when the motor is started, the switching delay is adjusted to be millisecond level from the second level of conventional time, and the switching delay of the controller is automatically recovered to be conventional second level from the millisecond level after the motor is started.
The full-voltage direct starting device of the low-voltage alternating-current motor comprises: the number of the motors A is one or more.
Compared with the prior art, the utility model, have obvious beneficial characteristics, can know from above technical scheme: the utility model discloses an automatically regulated parameter reactive compensation controller can be the millisecond level by the automatic adjustment of the second level of conventional time with switching delay parameter when the motor starts, and after the motor starts finishing, the switching delay parameter of controller then is by the millisecond level automatic conventional time of forming of invoicing. The utility model discloses well mutual-inductor is the input and the excision that are used for gathering current signal among the circuit, and the anti harmonious type smart capacitor of automatically regulated parameter reactive compensation controller control, and anti harmonious type smart capacitor is used for improving the power factor of customer's electric wire netting and suppresses the harmonic, and time relay is used for controlling the switching time delay parameter adjustment of automatically regulated parameter reactive compensation controller. The utility model discloses reactive power's change curve when starting according to the motor, adopt anti harmonious shape smart capacitor instant when the motor starts, a proper amount compensates and filtering to it, consequently, the power has been reduced because the inductive load increases and the reactive current of many outputs, make the reactive current in the circuit shift to the motor and anti harmonious shape smart capacitor between exchange, the reactive current who lets power (like the transformer) output reaches minimum, it is leading to export active current, just so can the greatly reduced power (like the transformer) the output current, thereby the impact to customer's electric wire netting descends by a wide margin. The utility model can make the motor keep the maximum torque starting, the starting is fast, and the working efficiency is improved; the starting current is small, and the energy consumption can be effectively reduced. The components such as a soft starter are reduced, the circuit is simplified, and the stability of the system is improved. The utility model is suitable for a start-up of alternating current (two-phase or three-phase) motor under all voltages.
Drawings
FIG. 1 is a schematic circuit diagram of a full voltage direct start device (a motor) for a low voltage AC motor;
fig. 2 is a schematic circuit diagram of a full-voltage direct start device (motors) of a low-voltage ac motor.
The labels in the figure are:
1. a transformer; 2. a reactive compensation controller for automatically adjusting parameters; 3. an anti-resonance smart capacitor; 4. a motor A; 5. a motor B; 6. a motor C; KT1, time relay; KT2, time relay; KT3, time relay; QS1, circuit breaker; QS2, circuit breaker; QS3, circuit breaker; QS4, circuit breaker; KM1, AC contactor; KM2, AC contactor; KM3, AC contactor.
Detailed Description
Example 1:
referring to fig. 1, a full-voltage direct starting device (a motor) of a low-voltage alternating-current motor comprises a mutual inductor 1, an automatic parameter adjusting reactive compensation controller 2, an anti-harmonic intelligent capacitor 3, a time relay KT1 and a motor a4, wherein the mutual inductor 1 is connected with the automatic parameter adjusting reactive compensation controller 2 in series, the automatic parameter adjusting reactive compensation controller 2 is connected with the anti-harmonic intelligent capacitor 3 in series, the automatic parameter adjusting reactive compensation controller 2 is connected with a power supply, the time relay KT1 is arranged on a circuit connected with the motor a4, a circuit breaker QS1 is arranged on a circuit connected with the power supply of the anti-harmonic intelligent capacitor 3, and an alternating-current contactor KM1 and a circuit breaker QS2 are sequentially connected with the circuit connected with the power supply of the motor a4 in series respectively. The harmonic-resistant intelligent capacitor automatically changes the switching delay parameter of the controller when the motor is started, the switching delay parameter is adjusted to be millisecond level from the second level of conventional time, and the switching delay parameter of the controller is automatically restored to be conventional second level from the millisecond level after the motor is started.
A method of full voltage direct start of a low voltage ac motor comprising the steps of:
(1) closing a circuit breaker QS1 and a circuit breaker QS2, connecting an alternating current contactor KM1, connecting a motor A4 with a power supply, directly starting the motor A4 under full voltage loading, simultaneously closing a time relay KT1, and adjusting the switching delay of the automatic parameter adjusting reactive compensation controller 2 from the conventional time of 20-30 seconds to a sensitive state of 20-50 milliseconds;
(2) the automatic parameter adjusting reactive compensation controller 2 collects power supply voltage and current parameters, calculates a real-time power factor value in real time, compares the real-time power factor value with a power factor set value, controls the anti-harmonic intelligent capacitor 3 to be switched in when the power factor set value is 0.9-0.99, and controls the anti-harmonic intelligent capacitor 3 to be switched off when the power factor set value is lower than the set value and exceeds the set value;
(3) after the motor is started, the automatic parameter adjusting reactive compensation controller 2 timely cuts off redundant harmonic-resistant intelligent capacitors when the power factor exceeds a set value, after the set time of the time relay KT1 is reached, the contact of the time relay KT1 is disconnected, the automatic parameter adjusting reactive compensation controller 2 automatically restores the switching delay to the conventional time, and the automatic parameter adjusting reactive compensation controller becomes a common compensation device to continue to compensate the reactive power in the circuit.
Example 2:
referring to fig. 2, a full-voltage direct starting device (three motors) of a low-voltage alternating-current motor comprises a mutual inductor 1, an automatic parameter-adjusting reactive compensation controller 2, an anti-harmonic intelligent capacitor 3, a time relay KT1, a time relay KT2, a time relay KT3, a motor A4, a motor B5 and a motor C6, wherein the mutual inductor 1 is connected with the automatic parameter-adjusting reactive compensation controller 2 in series, the automatic parameter-adjusting reactive compensation controller 2 is connected with the anti-harmonic intelligent capacitor 3 in series, the automatic parameter-adjusting reactive compensation controller 2 is connected with a power supply, the time relay KT1 is arranged on a circuit connected with the motor A4, the time relay KT2 is arranged on a circuit connected with the motor B5, the time relay KT3 is arranged on a circuit connected with the motor C6, a circuit connected with the anti-harmonic intelligent capacitor 3 is provided with a circuit breaker 1, and the motor, An alternating current contactor KM1 and a breaker QS2, an alternating current contactor KM2 and a breaker QS3, an alternating current contactor KM3 and a breaker QS4 are connected in series on the lines of the motor B5 and the motor C6 connected with a power supply in sequence.
The harmonic-resistant intelligent capacitor automatically changes the switching delay parameter of the controller when the motor is started, the switching delay parameter is adjusted to be millisecond level from the second level of conventional time, and the switching delay parameter of the controller is automatically restored to be conventional second level from the millisecond level after the motor is started.
A method of full voltage direct start of a low voltage ac motor comprising the steps of:
(1) the method comprises the following steps of closing a circuit breaker QS1, a circuit breaker QS2, a circuit breaker QS3 and a circuit breaker QS4, switching on an alternating current contactor KM1, switching on a motor A4 and a power supply, directly starting the motor A4 under full voltage loading, simultaneously closing a time relay KT1, and adjusting the switching delay of an automatic parameter adjusting reactive compensation controller (2) from the conventional time of 20-30 seconds to a sensitive state of 20-50 milliseconds;
(2) the automatic parameter adjusting reactive compensation controller (2) collects power supply voltage and current parameters, calculates a real-time power factor value in real time, compares the real-time power factor value with a power factor set value, controls the anti-harmonic intelligent capacitor (3) to be put in when the power factor set value is 0.9-0.99, and controls the anti-harmonic intelligent capacitor (3) to be cut off when the power factor set value is lower than the set value and exceeds the set value;
(3) after the motor is started, the automatic parameter adjusting reactive compensation controller (2) timely cuts off redundant anti-harmonic intelligent capacitors when the power factor exceeds a set value, after the set time of the time relay KT1 is reached, the contact of the time relay KT1 is disconnected, and the automatic parameter adjusting reactive compensation controller (2) automatically restores the switching delay to the conventional time;
(4) after the motor A4 is started, the AC contactor KM2 is switched on, the motor B5 is switched on with a power supply, the motor B5 is directly started under the full voltage loading, the time relay KT2 is simultaneously closed, and the automatic parameter adjusting reactive compensation controller (2) adjusts the switching delay from the conventional time of 20-30 seconds to a sensitive state of 20-50 milliseconds;
(5) the automatic parameter adjusting reactive compensation controller (2) collects power supply voltage and current parameters, calculates a real-time power factor value in real time, compares the real-time power factor value with a power factor set value, controls the anti-harmonic intelligent capacitor (3) to be put in when the power factor set value is 0.9-0.99, and controls the anti-harmonic intelligent capacitor (3) to be cut off when the power factor set value is lower than the set value and exceeds the set value;
(6) after the motor is started, the automatic parameter adjusting reactive compensation controller (2) timely cuts off redundant anti-harmonic intelligent capacitors when the power factor exceeds a set value, after the set time of the time relay KT2 is reached, the contact of the time relay KT2 is disconnected, and the automatic parameter adjusting reactive compensation controller (2) automatically restores the switching delay to the conventional time.
(7) After the motor B5 is started, the alternating current contactor KM3 is switched on, the motor C6 is switched on with a power supply, the motor C6 is directly started under full voltage loading, the time relay KT3 is simultaneously closed, and the automatic parameter adjusting reactive compensation controller (2) adjusts the switching delay from the conventional time of 20-30 seconds to a sensitive state of 20-50 milliseconds;
(8) the automatic parameter adjusting reactive compensation controller (2) collects power supply voltage and current parameters, calculates a real-time power factor value in real time, compares the real-time power factor value with a power factor set value, controls the anti-harmonic intelligent capacitor (3) to be put in when the power factor set value is 0.9-0.99, and controls the anti-harmonic intelligent capacitor (3) to be cut off when the power factor set value is lower than the set value and exceeds the set value;
(9) after the motor is started, the automatic parameter adjusting reactive compensation controller (2) timely cuts off redundant anti-harmonic intelligent capacitors when the power factor exceeds a set value, after the set time of the time relay KT3 is reached, the contact of the time relay KT3 is disconnected, the automatic parameter adjusting reactive compensation controller (2) automatically restores the switching delay to the conventional time, and becomes a common compensation device to continue to compensate the reactive power in the circuit.
Comparative example:
a PCZ1615 heavy-duty crusher is provided with 2 motors with 220kw, the rotor of the crusher weighs 18 tons and belongs to heavy-load starting, when the motor is started, a conventional soft starter is adopted for voltage reduction starting, only one crusher can be started, the starting maximum current is 1860A, the starting time is 58 seconds, and the power factor is reduced to 0.35 at the lowest.
Adopt the utility model discloses start the maximum current and be 1150A, start-up time 32 seconds, power factor then keeps between 0.75-0.95, because reduction starting current that can by a wide margin, can also start two motors that the weight is broken simultaneously, though maximum starting current has reached 2760A (maximum current has reached 3500A when starting 2 motors simultaneously with soft starter), the current value descends very fast, start-up time is 20 seconds
Therefore adopt the utility model discloses the output current of reduction transformer that way can be by a wide margin improves the starting torque of motor, reduces the start-up time to realize low pressure alternating current motor's full voltage direct start.
What has been described above is merely a preferred example of the present invention. It should be noted that other equivalent variations and modifications can be made by those skilled in the art based on the technical teaching provided by the present invention, and the protection scope of the present invention should be considered.
Claims (3)
1. The utility model provides a low pressure alternating current motor's direct starting drive of full pressure, includes mutual-inductor (1), automatically regulated parameter reactive compensation controller (2), anti harmonious intelligent capacitor (3), time relay KT1, motor A (4), its characterized in that: the transformer (1) is connected with the automatic parameter adjusting reactive compensation controller (2) in series, the automatic parameter adjusting reactive compensation controller (2) is connected with the anti-harmonic intelligent capacitor (3) in series, the automatic parameter adjusting reactive compensation controller (2) is connected with a power supply, a time relay KT1 is arranged on a circuit connected with the motor A4, a circuit of the anti-harmonic intelligent capacitor (3) is provided with a circuit breaker QS1, and a circuit of the motor A (4) connected with the power supply is respectively connected with an alternating current contactor KM1 and a circuit breaker QS2 in series in sequence.
2. A full-voltage direct start apparatus of a low-voltage ac motor as claimed in claim 1, wherein: the harmonic-resistant intelligent capacitor automatically changes the switching delay parameter of the controller when the motor is started, the switching delay is adjusted to be millisecond level from the second level of conventional time, and the switching delay of the controller is automatically recovered to be conventional second level from the millisecond level after the motor is started.
3. A full-voltage direct start apparatus of a low-voltage ac motor as claimed in claim 1 or 2, wherein: the number of the motors A (4) is one or more.
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| CN201921978548.8U CN211296597U (en) | 2019-11-15 | 2019-11-15 | Full-voltage direct starting device of low-voltage alternating-current motor |
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| CN201921978548.8U CN211296597U (en) | 2019-11-15 | 2019-11-15 | Full-voltage direct starting device of low-voltage alternating-current motor |
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| CN110868107A (en) * | 2019-11-15 | 2020-03-06 | 贵州科电电气有限公司 | Full-voltage direct starting device of low-voltage alternating-current motor and starting method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110868107A (en) * | 2019-11-15 | 2020-03-06 | 贵州科电电气有限公司 | Full-voltage direct starting device of low-voltage alternating-current motor and starting method thereof |
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Address after: 551206 d-4-1 in Airport Economic Industrial Park, Shuanglong Airport Economic Zone, Guiyang City, Guizhou Province Patentee after: Guizhou Kedian Environmental Protection Technology Co.,Ltd. Address before: 551206 d-4-1 in Airport Economic Industrial Park, Shuanglong Airport Economic Zone, Guiyang City, Guizhou Province Patentee before: Guizhou Kedian Electric Co.,Ltd. |