The paper introduced the hazard of large turbine generator operation under abnormal frequency and technical requirements and criteria for low frequency protection.
介绍了大型汽轮发电机组频率异常运行的危害和对低频保护的技术要求及准则；
Consider of water ecosystem protection and characteristics of ultrasonic technology, low frequency and low power ultrasonic especially suit to control algal growth in water body.
超声波的空化作用能够抑制藻类生长，从保护水体生态系统以及超声波技术本身的特点考虑，低频率、低功率的超声波更适合于水体抑藻应用。
Applications: Low Voltage, High Frequency Inverters, and Polarity Protection Applications.
主要用途：低电压整流，高频转换开关和极性保护。
The main circuit is consisted of 18 thyristors circuit and protection circuit. With the help of control subsystem, it can get the output of low frequency voltage (current) with the shape of sine wave;
主回路采用由18个晶闸管组成的三相零式电路，并辅以晶闸管的保护电路，通过控制可以得到低频正弦波的电压（电流）输出；
This Unit has large load, low stroke frequency, long stroke, high efficiency environmental protection, compact structure, safety, good movement performance.
该机具有大载荷、低冲次、长冲程、高效节能环保和结构紧凑、可靠性高、运动性优的特点。
This Unit has large load, low stroke frequency, long stroke, high efficiency environmental protection, compact structure, safety, good movement performance.
该机具有大载荷、低冲次、长冲程、高效节能环保和结构紧凑、可靠性高、运动性优的特点。
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