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CB spec. for filters in SVC

CB spec. for filters in SVC

CB spec. for filters in SVC

I would like to have some feedbacks on CB,s used in SVC,s in steel companies. we had a CB failure(explosion) in a 2nd harmonic filter.(33 KV CB).we are recommended to use 72.5 kv CB,s for all 2nd ,3th ,4th and 5th harmonic filters.The questions are:1-Are CB,s rated 50 HZ suitable for switching 100,150,200,250 HZ currents of filters?2-Is the cause of failure related to the phenomenon of interrupting  low inductive current caused by losing some cells in capacitor units leading to change the current inductive? If this is the probable cause so i think higher interrupting capacity CB ie 72.5 Kv (higher chopping number)worsen the situation.I thank you in advance

RE: CB spec. for filters in SVC

CB = circuit breaker?   SVC = what?  

Any non-linearity in the load is going to introduce distortion that will show up in the harmonics of your 50 Hz fundamental frequency; I assume that is what you are attempting to filter.  I'd be very surprised to learn a circuit breaker can't handle a fifth harmonic.  

Can you post a schematic of how your CBs and filters are interconnected?  

Are you attempting to keep the distortion out of your load, or keep the distortion (harmonics) from getting back onto the power supply?  

John D

RE: CB spec. for filters in SVC


If you are still interestdd in this topic, then you should post it in the "Electric Power & Transmission & Distribution" forum.  You'll get more responses there.


SVC = Static VAR Compensator

It is a fairly large system for managing reactive power in power distribution networks and industrial setups.

RE: CB spec. for filters in SVC

Thanks Rajeev!   

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