Last fall, a utility in the U.S. Midwest called us about a 15 MVA transformer that tripped on differential protection at 3 a.m. Their most recent oil sample, drawn six months earlier, had come back clean on every dissolved gas. We opened the tank and...
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Last spring, a plant engineer in Ohio emailed us about a 13.8 kV loop feeding three production buildings. A phase-to-ground fault had been hunting through that system for two weeks — the protective relays saw almost nothing, because the loop wa...
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Two summers ago, a utility in Texas added a second 1,000 kVA pad-mounted transformer beside an existing unit to carry a growing residential feeder. The plan looked simple: parallel the secondaries on a common bus and let both units share the load. On...
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Last spring, a utility engineer in California asked us to price a 25 MVA unit for a substation about two hundred meters from a protected wetland. The spec sheet said mineral oil, the way it always had. His question stopped our quoting engineer mid-se...
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Three weeks ago, an EPC buyer in Hanoi sent us a transformer specification written around IEEE C57.12.00, with "60 Hz" typed into the frequency column. The project is in Vietnam, where the grid runs at 50 Hz and the utility accepts IEC 60076 test rep...
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Two weeks ago an EPC buyer in Texas sent us an RFQ for wind farm transformer units with “33 kV” typed into the collector voltage column. The project is in the United States, where 34.5 kV is the default collector class. One number separat...
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Last month, a buyer in Ohio sent us two quotes for what looked like the same transformer: 1,000 kVA, three-phase, 13.8 kV to 480Y/277 V, both UL-listed, both from established Asian factories. One quote was 9% cheaper. He asked us to match the price. ...
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Last July, a utility in the U.S. Southwest called us about a 500 kVA pad-mounted transformer that kept tripping its winding temperature relay. The unit was four years old, load was below nameplate, and their local contractor was ready to replace it. ...
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Last spring, a plating facility in Monterrey sent us an RFQ for a '500 kVA rectifier transformer' and nothing else. Two weeks later their utility engineer was on the phone: the 6-pulse rectifier on their new line was pushing current total harmonic di...
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In June 2026, the U.S. Department of Energy opened an information-gathering request covering distribution transformers and electrical core steel, after a presidential determination found that grid infrastructure supply chains are essential to nationa...
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If your project requires dry-type transformer capable of performing under conditions of your site, it's not just matter of comparing nameplate ratings. Every technical parameter is of importance on mission critical infrastructure, such as data center...
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How to Size a Transformer for a Commercial Building Project The panel schedule lands on your desk Monday morning, and the contractor wants the transformer order placed by Friday. You have 37 loads to reconcile, a mechanical room two feet short...
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