For exerting the functions of the automatic under-frequency load-shedding device, setting for the device should be calculated correctly.

为有效发挥自动低频减负荷装置的重要作用，应正确进行装置定值的整定。

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Through analysis of the stability of NanBian power supply system in a steel enterprise, under-frequency load-shedding plans and regional security and stability control plans are adopted in this paper.

本文通过对某钢铁企业南变电力系统的稳定性分析，给出了低频减载和区域安全稳定控制两种方案。

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The Acoustic Thermometry of Ocean Climate (ATOC) project is asking to extend its two-year permit to operate low-frequency sonar under the water off Kauai another five years.

CNN: waves

Bankrolled by its toy sales, it has moved into cordless telephones, and now has half the market in America for high-frequency models, under its own label and for Lucent and Sony.

ECONOMIST: Electronic toys

The strategy also has come under heightened scrutiny amid concerns that some high-frequency traders were gaining unfair advantages in the market.

WSJ: In Fast-Trading Trial, Protection for Goldman Sachs Secrets