Palo Alto Opengov #RFQ199445

Refurbishment of Allis Chalmers Transformer AC-21 and Replacement of TLH-21 Load Tap Changer

The City of Palo Alto is seeking a one-time refurbishment of transformer AC-21 at Adobe Creek Substation, including replacement of its specified Allis Chalmers TLH-21 load tap changer. - Government buyer: City of Palo Alto, Utilities Department, Electric Engineering. - Transformer and OEM: Existing Allis Chalmers 15 MVA transformer, rated 60 kV–12470/7200 V, with a TLH-21 on-load tap changer (OLTC). - Requested product: One lump-sum item for a certified remanufactured TLH-21 LTC and components (part number TLH-21). Alternate or “or equal” quotations are not accepted. - Requested service: One lump-sum base bid for labor and equipment to test and repair the transformer, replace the LTC, reseal and replace specified gaskets and seals, service radiator valves, handle and process transformer oil, refill the tanks, and complete required testing. - Testing and notable technical requirements: Perform pre- and post-work power-factor tests on bushings and windings; turns-ratio tests at OLTC positions; excitation and winding-resistance tests; oil testing for dissolved gases, moisture, dielectric breakdown, and power factor at 100°C; and post-work sweep frequency response analysis (SFRA). Doble is mentioned in connection with power-factor testing. - Oil and site coordination: The contractor is to drain approximately 760 gallons from the LTC tank and approximately 4,348 gallons from the main tank; main-tank oil is to be processed and reused, and the LTC tank is to receive approximately 760 gallons of new oil. The City will de-energize, isolate, and ground the transformer and dispose of oil that is not reused.

Description

The City of Palo Alto Utilities is seeking quotes for a one-time refurbishment of the existing on-load tap changer and associated repairs at Adobe Creek Substation. Work includes replacing the tap changer with a certified remanufactured component, repairing radiator valves and gaskets, addressing oil migration, processing and refilling transformer oil, and commissioning and testing the transformer. Required testing includes Transformer Turns Ratio, Power Factor, excitation, winding resistance, SFRA, and oil-quality tests. Quotes are due November 3, 2026, at 3:00 p.m. Pacific Time; the prime contractor must hold a valid California Class A license and current DIR registration.

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