ML19259C420

RO 250-79-20 on 790531:emergency Diesel Generator Tripped as Result of Lockout Relay Operation.Cuased by Faulted Exciter Power Transformer

ML19259C420
Person / Time
Site:	Turkey Point
Issue date:	06/01/1979
From:	Yaeger M FLORIDA POWER & LIGHT CO.
To:
References
PTP-QC-79-102, NUDOCS 7906200365
Download: ML19259C420 (1)

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igel, phone motiffe=rfan o the. subject pec,ap t c1kis meme confirma egg _

motification reportable ecourranca made Tharatay 'May 31. 1979 to Mr, 3 3

.- Werdery et your"offic9.as-ifo11 oust.,. -~~ --

-OcarasEscE ~. Dorissis hlaanad 24 baur full' load test af the Emergangy t

-- Diesel cmrators GDCs) bains conducted with both auciaar smits shutdwo, the"A EDG tripped. an.as.a result af loamat relay ~cperation caused by a fasalted asciter,potear atramaformer _ GFT).

suha~equest 1=v=stigation and EDGs tAlch testik revealed a desige error present.on both the A and 5 could result $a 9Netheattag pese transformers at aestained high load

-operattom.

The primary of the wye-delta EPT was commacred to the EDG in a faar utre wye configuration etch that the normal third harmoesic generatar curresta circulated thz the via $he common acutral.

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%ile these third harmonic currests are espected and allowed for la the

' design of pe 3125 Ett generator. they represent a significant superimposed

. load das permitted ta cire=1ste through the 45 KTA transformer.

. coaBETIVE ACTidS = ' Theroughly insttumeated test guns wera penognad w1th and withoet the amistral commeetion between the 3DC and the EPT primary to confirm both.the cause and correctica of the problas.

A modification we Ce the 5 EDC as taplemanted. co gemove 'the ef fending meettal ra= men tion.

improper fusa contact on the primary side of one phasa of the EPT taas found and corrected abile tasting this modification.

As the modification / repairs are completed, a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> full loM rest will be i

. performed ou sach EDG.

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