Understand BIL Rating & Maximum Voltage in Equipment

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BIL (Basic Insulation Level) rating indicates the maximum voltage that equipment can withstand for a short duration, typically during transient events like lightning strikes. It is not the same as the maximum continuous voltage, which is the voltage the equipment can handle during regular operation, often referred to as the working voltage (VW). For equipment like capacitor banks, the BIL rating is essential for understanding surge protection, but the continuous voltage rating is crucial for safe operation. If operating at 1.1 per unit (pu) for a 115kV system, knowing the continuous voltage rating is vital to avoid damage. Manufacturers should provide both BIL and continuous voltage ratings for clarity.
Octavius1287
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The difference between BIL rating and Maximum voltage? Like is the BIL voltage the highest it can take in just one instant? how do i know what is the highest continuous voltage a piece of equipment can take? Like for a Cap bank i see a BIL rating but i need to know what's the maximum voltage

(like let's say its for 115kv and i wanted to run it at 1.1pu would it be damaged)
 
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The rated continuous use voltage is its working voltage, sometimes abbreviated VW.
 
so it should list that to correct? I can only find a BIL rating :/
 

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