Presumably everyone knows that the direct starting current of the motor is 4 to 7 times the rated current. The Dalan oil pump motor tells you: If the power of the motor is relatively small, then the impact on the grid is not very large, we allow it to start directly. Generally, the motor power is below 7.5KM and it is allowed to start directly.
Presumably everyone knows that the direct starting current of the motor is 4 to 7 times the rated current. The Dalan oil pump motor tells you: If the power of the motor is relatively small, then the impact on the grid is not very large, we allow it to start directly. Generally, the motor power is below 7.5KM and it is allowed to start directly.
But for large motors, the power is particularly large, so it is not allowed to start directly. If the rated current is 100A, then the current can reach several hundred amps at the moment of starting. The impact of such a large current on the grid is very large, which will affect the normal operation of other loads carried by the same grid. can be seen.
For example, when a large load starts, the light bulb will become darker. We sometimes have this situation at home. For example, when the TV is turned on, the light bulb sometimes suddenly darkens, also because of the load starting current. Too large, it is also extremely unfavorable for the insulation of the motor windings.
Therefore, soft start is generally required for large motors. The so-called soft start is that the voltage we apply is lower than the rated voltage at the beginning of the start-up.
Common soft starters have a soft starter start and an autotransformer step-down start.
The autotransformer step-down start is to add a voltage of 60% to 80% of the rated voltage at the beginning of the motor start, and let it rotate first. When it is turned up, it is switched to the rated voltage. This is a simple soft start process, and the soft starter is more advanced than the autotransformer step-down start, and the principle is the same.
The voltage of the soft starter to the motor is gradually increased from 0 to the rated voltage. The starting process is smoother and the starting effect is better. The impact on the grid and the damage to the winding is also minimal, which is better than the auto-transformer step-down starting.
The most commonly used in transmission engineering is the three-phase AC induction motor. In many cases, these motors are directly connected to the power system due to their starting characteristics. If you start directly online, it will generate up to 6 times the rated current of the motor. This current overloads the power supply system and the switching devices in series.
If it is started directly, it will also produce a higher peak torque, which will not only impact the drive motor, but also damage the mechanical device. In order to reduce the direct current, the starting auxiliary device, such as the starting reactor or the autotransformer, should be used, but the conventional method such as starting the reactor or autotransformer can only gradually reduce the voltage, and the soft starter can smoothly raise the terminal. The voltage can be achieved without impact starting.
Therefore, the following measures can best protect the power system and the motor:
1. Reduce the starting current of the motor, reduce the distribution capacity, and avoid the investment of capacity expansion;
2. Reduce the starting stress and extend the service life of the motor and related equipment;
3. Smooth start and soft stop avoid the surge problem and water hammer effect of traditional starting equipment;
4, a variety of starting modes and a wide range of current, voltage and other settings, can adapt to a variety of load conditions;
5. It can smoothly start/stop the motor without stepping, avoiding mechanical and electrical shocks caused by starting the motor in the traditional starting mode such as direct start, star/delta start, auto-decompression start-up, etc.
6, can effectively reduce the starting current and distribution capacity, to avoid capacity expansion investment.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
Copyright http: / (Dalan Motor) Reprint, please indicate the source
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
Presumably everyone knows that the direct starting current of the motor is 4 to 7 times the rated current. The Dalan oil pump motor tells you: If the power of the motor is relatively small, then the impact on the grid is not very large, we allow it to start directly. Generally, the motor power is below 7.5KM and it is allowed to start directly.
But for large motors, the power is particularly large, so it is not allowed to start directly. If the rated current is 100A, then the current can reach several hundred amps at the moment of starting. The impact of such a large current on the grid is very large, which will affect the normal operation of other loads carried by the same grid. can be seen.
For example, when a large load starts, the light bulb will become darker. We sometimes have this situation at home. For example, when the TV is turned on, the light bulb sometimes suddenly darkens, also because of the load starting current. Too large, it is also extremely unfavorable for the insulation of the motor windings.
Therefore, soft start is generally required for large motors. The so-called soft start is that the voltage we apply is lower than the rated voltage at the beginning of the start-up.
Common soft starters have a soft starter start and an autotransformer step-down start.
The autotransformer step-down start is to add a voltage of 60% to 80% of the rated voltage at the beginning of the motor start, and let it rotate first. When it is turned up, it is switched to the rated voltage. This is a simple soft start process, and the soft starter is more advanced than the autotransformer step-down start, and the principle is the same.
The voltage of the soft starter to the motor is gradually increased from 0 to the rated voltage. The starting process is smoother and the starting effect is better. The impact on the grid and the damage to the winding is also minimal, which is better than the auto-transformer step-down starting.
The most commonly used in transmission engineering is the three-phase AC induction motor. In many cases, these motors are directly connected to the power system due to their starting characteristics. If you start directly online, it will generate up to 6 times the rated current of the motor. This current overloads the power supply system and the switching devices in series.
If it is started directly, it will also produce a higher peak torque, which will not only impact the drive motor, but also damage the mechanical device. In order to reduce the direct current, the starting auxiliary device, such as the starting reactor or the autotransformer, should be used, but the conventional method such as starting the reactor or autotransformer can only gradually reduce the voltage, and the soft starter can smoothly raise the terminal. The voltage can be achieved without impact starting.
Therefore, the following measures can best protect the power system and the motor:
1. Reduce the starting current of the motor, reduce the distribution capacity, and avoid the investment of capacity expansion;
2. Reduce the starting stress and extend the service life of the motor and related equipment;
3. Smooth start and soft stop avoid the surge problem and water hammer effect of traditional starting equipment;
4, a variety of starting modes and a wide range of current, voltage and other settings, can adapt to a variety of load conditions;
5. It can smoothly start/stop the motor without stepping, avoiding mechanical and electrical shocks caused by starting the motor in the traditional starting mode such as direct start, star/delta start, auto-decompression start-up, etc.
6, can effectively reduce the starting current and distribution capacity, to avoid capacity expansion investment.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
Copyright http: / (Dalan Motor) Reprint, please indicate the source
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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