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Hello Gents , can anyone tell me whats is the defferences between Nozzel and diffuser and orifice ? and for which porpuse should be used ? thanks in advance

HELLO PRC, what does it mean , 112,119,126 ....by which calculation u got it ?

Dear Waross, yes , due to a void over flux . but can u tell me howmany delay time setting you need to trip(I mean it should be the GSU work for some time in under freq. condition then sending trip signal ?

Thank Gents , I need the formula that tell me that the time delay is:5 sec for example not more to protect the GSU ?

Thanks PRC , do u have a curve between the time and the freq. ? because for example if the rated freq is 50Hz ,and the the transformer if expose to 47 Hz How I can know the time it should not be more than for example 5 sec ? OR is there any formula that give me the time limit for UF ?

Thanks Engineers , for the kind reply . But why the UF is limited by a time ? I wana the equation that approve the time setting for this protection? to be the transformer not expose more to UF .

Hello Engineers , I wana to understand what will happen for the 200MVA power transformer if it worked under nominal frequency for some time ? I mean why there is UF protection ? and how many time is safe for it ?