Nanjing University, Voltage Sag Solution
The voltage sag protection system from case study 2 was installed in a chemical plant that produces methanol and ammonia.

A Voltage Sag Solution

Protective systems enable utilities to mitigate sags that cause sensitive equipment to stop working.

The development of power electronics technology and applications in industrial automation have resulted in the installation of AC-DC-AC inverters, now commonly used because they offer excellent speed control and energy savings. Short-time voltage drops (that is, voltage sags and dips) often occur on transmission systems and distribution networks for various reasons. Although they have little impact on traditional electrical devices, these voltage disturbances can cause an inverter to trip due

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