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Allowable Voltage Dip for Generator Sizing

When sizing a generator, one of the most important technical considerations is the allowable voltage dip for generator sizing. This parameter affects not only the generator's size but also the performance of equipment it powers. Understanding this concept is essential for engineers, technicians, and facility managers. A voltage dip is a temporary drop in voltage. It usually occurs when a load is applied to the generator. The drop may only last for a few milliseconds, but it can have a serious impact on sensitive equipment. Generators do not deliver full voltage instantly. When starting motors or large loads, there is a surge in demand. This demand causes a temporary voltage drop. If this dip exceeds allowable limits, equipment may fail to start or could be damaged. The allowable voltage dip is the maximum drop in voltage that connected equipment can tolerate without malfunctioning. For most applications, the common range is between 10% and 30%. However, the specific allowable dip depends on the type of load and criticality. Generators are usually oversized to maintain voltage within this acceptable dip range during load steps. The lower the voltage dip limit, the larger the generator needed.

Why Allowable Voltage Dip for Generator Sizing Matters

Incorrect generator sizing can result in operational problems. When loads are turned on, especially inductive ones like motors or transformers, they draw high inrush currents. These inrushes cause voltage to sag temporarily. If the allowable voltage dip for generator sizing is not properly considered, this sag may exceed acceptable thresholds. The result may be: - Lights flickering or turning off - Relays dropping out - Motor contactors chattering - UPS or inverter systems failing Power systems must maintain voltage stability, especially for sensitive industrial processes or data centers. Choosing a generator that meets voltage dip criteria ensures safe startup of all loads and avoids costly downtime. Read More.....

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