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First, the basic concept of water resistors. By melting the electrolyte solution in the water, (NaHCO3) positive ion conductivity, the electrolyte solution fills the middle of the two plan view pole pieces, forming a capacitor-like conductor, itself irrational components, so with frequency sensitivity, reactance The comparison of starting equipment and equipment, etc., has the effect of improving the power factor of the motor and saving energy and reducing emissions. After the water resistor is inserted into the stator control loop of the motor motor,
First, the basic concept of water resistors.
By melting the electrolyte solution in the water, (NaHCO3) positive ion conductivity, the electrolyte solution fills the middle of the two plan view pole pieces, forming a capacitor-like conductor, itself irrational components, so with frequency sensitivity, reactance The comparison of starting equipment and equipment, etc., has the effect of improving the power factor of the motor and saving energy and reducing emissions. After the water resistor is inserted into the stator control loop of the motor, not only can the slip S of the motor be changed, but also the shifting target can be increased, and the torque of the motor can be increased to reduce the starting current. It has a smooth and infinitely variable speed and allows the speed ratio to exceed the rated speed ratio. HYT series water resistance speed regulating motor should adjust the rated power of the motor by changing the liquid resistance starting cabinet connected to the generator rotor control loop. The larger the resistor, the lower the rated power of the motor; the resistor is zero and the motor reaches the speed. In order to get rid of the over temperature condition of the raw water resistor in the whole process of the shifting, the circulating system water cooling equipment
Second, technical characteristics. 1. The large, medium and small-sized wire-wound asynchronous motor carries out infinitely variable speed, and the gear ratio reaches 2:1, which can completely consider the shifting range required by the machine equipment;
2. It is used for motor starting, and has all advantages of small starting current and stable starting of water resistance soft starter;
3. Frequency shifting, thyristor cascade shifting comparison is more economical and reliable, and maintenance is simple;
4. Compared with the hydraulic coupling, the layout is flexible and convenient to use. The other, after using the hydraulic coupling, the mechanical equipment can not reach the speed of the motor during operation, and the transmission can be used more than this;
5. For the exhaust air volume and the speed ratio is proportional, the speed regulating motor adjusts the linearity of the exhaust air volume to be stronger. The liquid resistor circulatory system can be cooled by water.
Third, the rolling water resistance shifting speed and the bottom pressure AC motor speed control.
1. The high-order pulse current caused by the large space soft starter causes relatively large environmental pollution to the power grid, making the distribution transformer hot, dry and weakly operating the instrument panel, and the power factor is low, at 50% of the rated speed. The power factor can only be 0.3 to 0.5. The liquid resistor shifting not only does not cause all pulse current, but also maintains the motor power factor of 0.8-0.9 in all low-speed gears, which can significantly improve the quality of the power grid, improve the power factor, and the technical complexity of the AC motor speed control is difficult. The liquid resistor is quick and easy to use, and the maintenance is convenient. 2. From the perspective of energy conversion, the liquid resistor speed control motor is a way to convert all the slip rate into energy, that is, it needs to reduce the speed ratio by increasing the output power of the slip, and the speed ratio is about low. The shifting high efficiency is about low, the high speed over DC frequency conversion at high speed, and the DC frequency conversion has no such defects. 3. DC frequency conversion can maintain the whole process of shifting from zero to high speed, and the ratio of water resistance shifting is 1:2. 4. At the current stage, the soft starter of the bottom soft starter can only be 315KW at high power, while the water resistance shift can exceed 3200KW. The high-voltage inverter is more expensive. 5. After the motor volume exceeds 250KW, the rolling pressure is usually selected. Due to the operation, the bottom pressure is large, uneconomical, and unscientific.
Today, chemical plants use more. Not to defeat the goods. Not only the motor rotor, but also the motor stator can be a water resistor. Two key categories:
1. Water resistor starter cabinet (applicable to all high-voltage motors, rotor string water resistors can be equipped with cameras to compensate for reactive power);
2. The liquid resistance starter cabinet , the basic principle is made by series pole shifting. Features: The available places are not high in the natural environment, the credibility is good, and the cost is extremely low. Defects: water resistors are ultra-low temperature to the natural environment (0 degrees) In the following cases, there must be automatic heating equipment. It is not only affected by the working temperature and alkaline preparation, but also has high efficiency compared with DC frequency conversion. At this stage, for the rolling wound motor, the liquid resistance starter cabinet has a high cost performance. The best is, it is not said. My problem is that there is no deepening of quantitative analysis manipulation at this stage. The reliability of the water resistor is very high, but the cost can only be 1/4-1/3 of the DC frequency conversion. In terms of cost, the customer no doubt prefers the water resistor. However, the technical content may be better than On top of the DC voltage conversion. Fourth, the basis According to the left and right, AC motor speed and water resistance shift are good or bad. In view of the actual situation, the cost performance of the water resistance shifting is better than that of the soft starter, which is more effective. It is proposed to use the tap water resistance shifting. After the application of the water resistor, the key is to reduce the investment in the previous project, but the long-term is unclear. The frequency converter is used for variable speed centrifugal fan and centrifugal water pump. After one year or two, the operating cost of the machine equipment can be retrieved. However, the water resistor is not clear whether the cost can be recovered.
It should be said that the shifting can be environmentally friendly and energy-saving, but there is no example of how much. The water resistor shifting is only applied to the entangled motor. Those who have learned the electric welder understand that the method of shifting the wire-wound motor is to say that the motor is wound around the rotor. The resistance of the string resistor is maintained, and the water resistor shifting means that the necessary resistor is generated after adding the electrolyte solution in the water, and the water resistor is stringed in the motor rotor control loop, almost exceeding the purpose of the shifting. The water resistor Variable speed is often used in concrete\smelters, and the root cause of project investment is low. The other application is limited, and it is only used in entangled motors. The use of the cage motor only has the effect of soft start, and can drive a motor of tens of thousands of kilowatts.
Water resistance starter cabinet: water resistance, said white, that is, water resistors (also known as liquid resistance cabinets). This technology originated in Japan at the very beginning. It was introduced to China in the first half of 1985. It has been widely used in large-space motors today, and it is more suitable for China's national conditions. Because the motor starts immediately, the starting current will exceed 7~8 times of the rated voltage of the motor. Usually, the volume of the upper-level transformer is responsible for the soft starter manufacturer, the thermistor soft start, the rolling cage starter cabinet, the bottom pressure. Solid state hard disk soft start, winding motor soft start cabinet