作为电子电路，变频器本身也要耗电(约额定功率的3-5%)。一台1.5匹的空调自身耗电算下来有20-30W，相当于一盏长明灯。变频器在工频下运行，具有节电功能，是事实。
As an electronic circuit, the converter itself also consumes electricity (about 3-5% of rated power). A 1.5-piece air conditioner consumes 20-30W of electricity, which is equivalent to a long light. It is a fact that the frequency converter operates under the power frequency and has the function of saving electricity.
但前提条件是：
But the prerequisite is:
第一，大功率并且为风机/泵类负载；
First, high power and fan/pump loads;
第二，装置本身具有节电功能(软件支持)；
Secondly, the device itself has power saving function (software support);
第三，长期连续运行。
Third, long-term continuous operation.
以上是体现节电效果的三个条件。如果不加前提条件的说变频器工频运行节能，就是夸大或是商业炒作。知道了原委，你会巧妙利用它为你服务。一定要注意使用场合和使用条件才好正确应用，否则就是盲从。
These are the three conditions that reflect the effect of power saving. If we do not add preconditions to say that the power frequency operation of frequency converters can save energy, it is exaggeration or commercial hype. Knowing the origin, you will use it skillfully to serve you. We must pay attention to the use of occasions and conditions in order to apply correctly, otherwise we will follow blindly.
功率因数补偿节能
Power Factor Compensation Energy Saving
无功功率不但增加线损和设备的发热，更主要的是功率因数的降低导致电网有功功率的降低，大量的无功电能消耗在线路当中，设备使用效率低下，浪费严重。
Reactive power not only increases the line loss and equipment heating, but also reduces the active power of power grid due to the reduction of power factor. A large amount of reactive power is consumed in the circuit, and the equipment is inefficient and wasted seriously.
使用变频调速装置后，由于变频器内部滤波电容的作用，从而减少无功损耗，增加电网的有功功率。
After using the frequency conversion speed regulating device, due to the function of the filter capacitor inside the frequency converter, the reactive power loss is reduced and the active power of the power grid is increased.
软启动节能
Soft Start Energy Saving
电机硬启动对电网造成严重的冲击，而且对电网容量要求过高，启动时产生的大电流和震动时对挡板和阀门的损害极大，对设备、管路的使用寿命极为不利。
Hard startup of motors has a serious impact on the power grid, and it requires too high capacity of the power grid. The large current and vibration generated during startup cause great damage to the baffle and valve, which is extremely harmful to the service life of equipment and pipelines.
而使用变频节能装置后，利用变频器的软启动功能将使启动电流从零开始，最大值也不超过额定电流，能减轻对电网的冲击和对供电容量的要求，延长设备和阀门的使用寿命，节省设备的维护费用。
After using frequency conversion energy-saving device, the soft start function of frequency converter qingxiji.89ix.comdipingy.89ix.commojuhpz.37ix.com.cnmojusn.37ix.com.cn zhagun.37ix.com.cnwantoun.37ix.com.cnwill make the starting current start from zero, and the maximum value will not exceed the rated current. It can reduce the impact on the power grid and the requirement of power supply capacity, prolong the service life of equipment and valves, and save the maintenance cost of equipment.
理论上讲，变频器可以用于所有带电动机的机械设备中。电动机在启动时，电流会比额定高5-6倍，不但会影响电机的使用寿命，而且消耗较多的电量。系统在设计时在电机选型上会留有一定的余量，电机的速度是固定不变，但在实际使用过程中，有时要以较低或者较高的速度运行，因此进行变频改造是非常有必要的.
In theory, the frequency converter can be used in all mechanical equipments with motors. When the motor starts, the current will be 5-6 times higher than the rated value, which will not only affect the service life of the motor, but also consume more electricity. In the design of the system, there will be a certain margin in the selection of the motor. The speed of the motor is fixed and unchanged. But in the actual use process, sometimes it needs to run at a lower or higher speed. Therefore, it is necessary to carry out frequency conversion transformation.