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HomeMy WebLinkAboutAgenda Report - July 5, 1984 (96)n V• CITY COUNCIL MEETING `.. JULY,,14" 1984 SPDCIFICATICICS CX7I.MIL APPROM MIE SPDCIFIC'ATI"M FOR 111E LOADIM/SHI'D- FCR TliE !HENT (RE:11M SH I MENTlt MOADING) OF ME K I I LELEA #2 SHIn.wr OF TRANSFER BANK. FM REPAIR AT TME WWrIbMaJSE REPAIR 11AT IG4 FACILITY AND ALM ICRI ZED TltE AD - i'S IN , RR BIDS Tl-IERBCN. I TRANS- IHR APPIND Council was apprised that this substation transformer has ,tj �C ++ been taken out of service. because of an overheated condition; subsequent tests have shown that it is damaged. The ,:tent of damage cannot be determined without the transformer being disasseafiled in a transformer shop and further evaluated. The unit was manufactured. and previously repaired in 1978 (a different failure from the current one). by the Westinghouse Electric Corporation. Westinghouse has all equipment drawings and specifications in its library. The estimated cost of this 'shipping service' is $20,000 ma.ximum. The cost for repairs cannot be estimated accurately until the extent of dam;ige is known; however, even a ccuplete 'rewind' would cost less than a new unit. y 4. L f x t 7 Y 5 \ �'. - t •a y 5;35 5 t`.j�• V r 1i Y -'�^1 ,?fit ,,) Y \ s•�YkF '4..F V. t35� ��1S4b���I��. ` Xrt 1 E \� 1ti �14t •S$ Sh: T'y 1 •.. -.. 4''i 4 'l 4 5 MY .�t a `.., TO THE CITY COUNCIL FROM THE CITY MANAGER'S OFFICE UNCII. C011 MUNICATI DATE i NO. „une 25, 1984 j SUBJECT. SPECIFICATIONS FOR THE SHIPMENT OF SUBSTATION POWER TRANSFORMER (UD -E84-6) Specifications for the loading/ shipment (and return shipment./unloading) of the Killelea #2 transformer bank, for repair at the Westinghonse repair facility in Compton, California, are presented for Council's approval and permission to advertise for bids is requested. The bid opening date has been set for Tuesday, July 17, 1984. This substation transformer has been taken out of service, because of an over- heated condition; subsequent tests have shown that it is damaged. The extent of damage cannot be determined without the transformer being disassembled in a transformer shop and further evaluated. The unit was manufactured, and previously repaired in 1978 (a different failure from the current one), by the Westicighouse Electric Corporation. Westinghouse has all equipment drawings and specifications in its library. The estimated cost of this 'shipping service' is $20,000 maximum. The cost for repairs cannot be estimated accurately until the extent of damage is known; however, even a complete 'rewind would cost less than a new unit. David K. Cur Utility Direct r Attach. rl�7=`�Ir5i1'vi TO: DAVID K. CURRY, UTILITY DIRECTOR FROM: HANS HANSEN, ASSIST. UTILITY DIRECTOR DATE: JUNE 21, 1984 SUBJECT: KILLELEA #2 TRANSFORMER FAILURE On May 1, 1984 (at 0700 hrs.), the Killelea #2, 60/12•kv transformer bank was taken out of service as a result of an overheated condition in the auto - transformer section. The outside paint. in this area, is discolored from heat. Subsequent tests performed on the oil indicate possible arcing as well as severe overheating. Electrical tests applied to the transformer indicate a malfunction of at least a portion of the auto -transformer section. Further analysis and evaluation as to the extent of failure/damage cannot be accomplished without a 'tear -down' of the core -coil assembly, a task that can only be performed by untanking the unit. Untanking•power transformers in the field is not practical, probably not even possible, and is not recommended. At this point, it is proposed that the transformer be shipped to the Westinghouse repair facility in Compton, California for untanking and a complete evaluation of the extent of damage. Westinghouse is reccamiended for a number of reasons, such as: (1) Westinghouse is the manufacturer- of the transformer and thus has all drawings and specifications in its library; (2) Westinghouse is highly recommended by other utilities for its expertise in repair/rebuild at the Campton facility; (3) Westinghouse charges (overall) will be lower than those of a comparable General Electric facility in Anaheim (informal itemized quotes have been obtained). Since the extent of damage is still unknown at this time, the cost for repairs cannot be determined. However, costs for a 'worst-case' repair have been determined not to exceed $143,000. Worst-case repair costs consist of a complete rewind, based on all core -steel being reusable. Westinghouse personnel feel confident, with their knowledge of the failure, that the core -steel has not -been significantly damaged. It is quite likely that less than a complete rewind will restore the unit to operating condition. In the event of a complete rewind, the unit would be restored to the latest design specifications and be equivalent to a new unit with comparable warranties. An equivalent new unit, if it were to be purchased today, would cost an estimated $260,000. It should be noted that, in addition to repair costs, there are rigging and transportation expenses as well as new transformer oil. It is estimated that these costs will not exceed $30,000.