Sudden Pressure Blocking for Through-faults
Sudden Pressure Blocking for Through-faults
(OP)
Is it a good idea to block Transformer Sudden Pressure Relay for through faults. Please explain why or why not.
Thanks
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Sudden Pressure Blocking for Through-faults
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Sudden Pressure Blocking for Through-faultsSudden Pressure Blocking for Through-faults(OP)
Is it a good idea to block Transformer Sudden Pressure Relay for through faults. Please explain why or why not.
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RE: Sudden Pressure Blocking for Through-faults
RE: Sudden Pressure Blocking for Through-faults
RE: Sudden Pressure Blocking for Through-faults
Regards
Marmite
RE: Sudden Pressure Blocking for Through-faults
Sounds like a problem for EHV transformers.
RE: Sudden Pressure Blocking for Through-faults
A false trip of a sudden pressure relay on a through fault could keep a generator off line for a couple days while transformer tests were conducted. I guess we were lucky to not have a false trip.
RE: Sudden Pressure Blocking for Through-faults
Never seen, never used some adiitional logic for SPD.
Actually, is not so true, we had problem with false trips of SPD, but Westingause type only.
Sorry, but Im not like this idea, in additional, not always used BI of protective IEDs, in lot of cases used simple LOR.
Problem in SPD, not in the trough fault and gas accomulated.
RE: Sudden Pressure Blocking for Through-faults
RE: Sudden Pressure Blocking for Through-faults
When through fault currents pass through transformer, windings start oscillating vertically due to dynamic axial compressive forces( copper and press board act as masses connected by springs).This in turn create pressure waves in oil.
Rcwilson,I think you need not worry much in generator transformers as magnitude of through fault current in such transformers will be very much less compared to network transformers.Normally generator impedance will be almost double of transformer impedance and this total impedance will limit fault current 3-4 times full load current and hence winding oscillations will be less.
RE: Sudden Pressure Blocking for Through-faults
here in Italy we use SPRs on EHV/HV interconnection autotransformers, without block. SPR and Buchholz realay settings must comply with transformer design in order to not misoperate in case of external faults or seismic events. Thus even if SPR is not inhibited during faults false tripping is actually not an issue.