Beijing Leader & Harvest Electric Technologies Co., Ltd.
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Energy Saving
1. Energy saving by variable frequency drive
At present, all the world are worried about lack of energy sources. With the rapid development of economy, lack of energy sources are restricting economy growth increasingly. So energy saving and emission reduction are seriously concerned.

There are several ways to save energy, such as waste utilization, renewable sources, prohibition of power consuming device. It is no doubt that adopting technology of variable frequency speed adjusting to control high voltage motor on fan, pump and compressor is a good way in energy saving. 80% power consumption of load is on motor and power is mainly in range of 300~3200kW in power plant, water plant, steel plant and oil mill. After demonstrating, it is easy to reconstruct with variable frequency drive and energy saving rate can be 20~40%.

Because of considerable effect of energy saving of motor, human researched kinds of methods to adjust motor speed. So far, variable frequency speed adjusting is the best solution as its high efficiency and precision, wide adjusting range and soft start. This way not only can save energy but also improve production process and automation

Due to lack of energy sources and requirement of production process, high voltage variable frequency drive has been only way to save energy for big plants. In recent years, high voltage variable frequency drive is being accepted and welcomed by more and more users.

2. Energy saving by wind power
In recent years, expensive oil and coal source are also important factors that influence economy in the world. Energy crisis is harassing the human. In addition, warmer weather urges the human to exploit new energy source and utilize renewable source and reduce emission of green house gases, such as carbon dioxide.

As a clean and renewable energy source, wind power develops quickly in the world in recent years. Europe Wind Power Institute said that the human took energy from wind power on 30% annual growth in latest 6 years. West America, China, Japan, India, South America and parts of Europe are working hard to develope wind power. Danmark is a country which utilizes wind power in highest percent. About 20% of energy source comes from wind power in Danmark.

Another reason why wind power receives more and more attention is the low cost. Take the USA for an example, generating 1kwh power by wind power costs less than 4 cents. Comparing with oil and coal, wind power has a strong competitive power in price and this price will be down to half in coming decade.

Variable Frequency Drive
  • FVS VFD PWM rectifier technology. Energy can flow bi-directionally between power grid and the motor;
    Vector control for synchronous motor;
    Strong start up with load in ...
  • VA VFD Input current harmonic: <3% (comply with standard IEEE519);
    Input power factor: >0.95(>20% load);
    Output current harmonic: <2.5%; output DC ...
  • FVA VFD Auto re-start after the recovery of main medium voltage;
    Fly-start at any rotating speed;
    Bypass the faulty power cell automatically( OPTIONAL FUNCTION) ...
  • FVA VFD Auto re-start after the recovery of main medium voltage;
    Fly-start at any rotating speed;
    Bypass the faulty power cell automatically( OPTIONAL FUNCTION) ...