01Sell Delta Star Transformer Assets With the Right Records
California Transformer Buyer reviews single transformers, spare units and mixed equipment lots throughout California. Previously energized equipment, decommissioned assets and never-energized surplus can all be submitted for consideration. A review is not a guarantee of purchase.
Start with the transformer itself rather than a general equipment description. For station-class equipment, the substation transformer buying page explains the broader category; for unused project leftovers, see our new-surplus transformer guidance.
- Power transformers removed from service or held as spares
- Mobile transformers and mobile or unitized substations
- New-surplus units with factory records
- Incomplete or damaged assets with a documented condition
02Delta Star Power Transformers and Mobile Substations
Delta Star manufactures power transformers and mobile or unitized substations. Its advertised current mobile capabilities extend to 133 MVA and 345 kV. Those figures describe manufacturer capabilities, not the rating of every Delta Star unit or a purchase limit for this buyer.
Equipment offered for resale may carry current or legacy Delta Star nameplates. Identify the manufacturer exactly as shown; do not infer a successor company or replacement model from age alone. California Transformer Buyer is an independent buyer and is not affiliated with Delta Star or any utility.
If your inventory describes a Delta Star pad mount transformer, send photos to establish the actual configuration. A ground-level enclosure alone does not establish the equipment family. Our pad-mounted transformer buying guidance covers that separate category without assuming a Delta Star product line.
03What to Capture on a Delta Star Transformer Nameplate
Photograph any externally accessible nameplate only from a safe position where you are authorized to be. Plate placement and field names vary by unit and vintage. Look for the serial number, manufacture year and any catalog, style, type or drawing number; not every plate includes all of these.
Take one photograph of the entire plate and readable close-ups if needed. Preserve the connection diagram and every cooling-stage rating. The transformer nameplate reading guide explains how to interpret these fields without substituting assumptions for missing information.
- Manufacturer, serial number, year and catalog/style number if present
- All kVA or MVA ratings and cooling designations
- HV/LV voltages, phase, frequency and connection diagram
- Tap range, impedance, BIL and temperature rise
- Fluid type, volume, total weight and PCB label
- Winding material, if explicitly stated
04Why Rating and Condition Matter More Than Brand
A Delta Star transformer buyer needs a usable electrical specification, not just a recognizable name. A hypothetical 12/16/20 MVA ONAN/ONAF/ONAF plate identifies different cooling-stage capacities; reporting only 20 MVA omits important operating information. Primary voltage, secondary voltage, impedance and taps also affect suitability.
Age helps establish context, but it does not prove condition. Recent test reports, service history and complete accessories can support evaluation of used Delta Star transformers. Leaks, damaged bushings, missing fans or uncertain storage conditions require closer review.
California voltage requirements vary by utility and application. SCE has documented 66 kV subtransmission, while PG&E has 115 kV transmission/subtransmission; neither establishes compatibility for a particular project. Use actual nameplate data. Our guide to transformer value factors explains why specifications and condition outweigh brand alone.
05Mobile Substation Sales Need an Equipment Inventory
A mobile substation is more than its transformer. State whether the sale includes the trailer, switchgear, controls, cooling equipment, cables and other installed accessories. Identify missing components and provide separate equipment plates or records where available.
Send overall photographs, available dimensions and documented transport weight. Stored condition and transport readiness are separate questions: an electrically sound unit may still need substantial shipping preparation. Do not move equipment or remove components to obtain information; qualified professionals must evaluate those tasks.
- Transformer and associated equipment included in the sale
- Trailer identification and available ownership records
- Known missing parts or control modifications
- Site access, overhead restrictions and loading limitations
06Fluid Records, Ownership and Qualified Removal
Provide existing fluid tests, PCB documentation and any leak history. Under federal TSCA classifications, non-PCB means below 50 ppm—not zero PCBs. Unknown status may require regulatory assumptions until testing or qualifying documentation establishes concentration.
California has stricter rules for PCB-containing oil, including excluding oil containing 5 ppm or more PCBs from its used-oil category. The correct management pathway depends on testing, documentation and the equipment’s circumstances. Rely on qualified environmental professionals; this information is not legal advice.
You must own the equipment or have authority to sell it. Only your qualified electrical contractor or serving utility should handle isolation and disconnection, including backfeed risks. Our transformer removal and pickup guidance explains planning considerations; large loads may also require highway and local permits.
07Send Rocky a Complete Delta Star Review Package
Text photos to (951) 403-5738 or request a transformer offer through the contact form. Include quantity, California location, operating or storage status, known defects and available factory or field test reports. Reviewing your transformer costs nothing and creates no obligation.
Rocky may request additional records before making a decision. Any written offer states what is included, who handles loading or rigging and freight, and payment terms and timing. Confirm those terms before pickup rather than assuming removal or transport is included.
FAQDelta Star FAQ
Can I submit a Delta Star transformer that is still operating?
Yes. Identify it as currently energized and describe the expected availability date. Send existing records and only safely accessible photos. Evaluation does not authorize shutdown or access to restricted equipment. Your qualified contractor or serving utility must plan any isolation and disconnection before a sale can proceed to removal.
What if the serial number or manufacture year is unreadable?
Send the clearest safe photograph available and explain which fields cannot be read. Existing factory reports, maintenance files, drawings or purchase records may help identify the unit. Do not guess the year from appearance or treat a drawing date as the manufacture date without supporting documentation.
Do you consider a mobile transformer without its trailer?
Submit it for review and clearly state that the trailer is excluded or missing. Include the transformer’s specifications, accessories and available handling information. Missing transport equipment changes the sale scope and removal planning, but the purchase decision still depends on the particular asset, documentation and condition.
Does a never-energized Delta Star unit need condition documentation?
Yes. Never energized describes service history, not necessarily present condition. Explain how the unit was stored, whether packaging remains intact and whether any components were removed. Factory reports and documented inspections help distinguish a well-preserved new-surplus asset from equipment with uncertain storage or completeness.
Can a property owner sell a utility transformer on the property?
Only if the property owner actually owns it or has documented authority to sell it. Physical location does not establish ownership. Check asset records and the applicable ownership arrangement before offering equipment. A transformer owned by the serving utility cannot be sold by the property owner.
Do you buy Delta Star equipment outside California?
No. California Transformer Buyer buys from sellers located in California only. For a California asset, provide the equipment’s actual location, not just your billing address, along with site-access details. That information helps Rocky evaluate the scope of the transaction and any transport or removal requirements.