A melt shop engineering team in Southeast Asia sent us a furnace transformer nameplate last spring: 60 MVA, 33 kV primary, 650 V secondary, 8% impedance, and a tap table with 23 positions. Their question was straightforward — could we build the...
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Transformer Tap Changers Explained: OLTC vs Off-Circuit and How to Specify the Right Tap Range Last March, a maintenance manager at a poultry processing plant in southern Vietnam sent us a photo of a nameplate tap table. The unit read ±2 &time...
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An EPC contractor working on a seawater reverse osmosis plant near Jebel Ali sent us a single-line diagram in March with a covering note calling the electrical scope "essentially final." The drawing showed one 20 MVA transformer at 33/11 kV, a...
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A fleet operator in Texas sent us a site plan last month for a truck charging hub: four megawatt-class stalls, a 25-year lease on a yard near a distribution center, and a utility service that topped out at 1.5 MVA. The plan looked fine on the ...
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A contractor in Texas called us on a Tuesday morning last year with a problem that had already cost him two site visits. Every time his crew energized a new 1,000 kVA pad-mounted transformer, the upstream 12.47 kV feeder breaker tripped. The unit tes...
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Last month a utility buyer in Texas forwarded us three quotes for the same 1500 kVA pad-mounted unit. The spread was 31% between the lowest and the highest, and none of the three documents listed the same test scope. That is not a market anomaly &mda...
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The choice of transformer is an important one that could affect safety, efficiency and operating expenses. Both high performance dry-type transformers and oil-immersed transformers are produced at Jiangsu Ryan Electric Co., Ltd., with the transformer...
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An operations manager at a coastal utility in the Philippines emailed us a photo of a transformer breather last April. The silica gel inside had turned pink — exhausted — and his crew had already replaced it twice that quarter. Humidity a...
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A procurement manager for a Chilean mining contractor called us in July with a question we hear more often than buyers expect: if he ordered a 15 MVA oil immersed transformer from our factory, did protection come included, or did he have to source it...
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A purchasing manager in Ohio called us in May with a question we hear almost daily now. Not about price, not about kVA — about a date. "If we approve the drawings this week, which week does the transformer ship?" Six years ago we could answer f...
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Last quarter, a contractor in Texas sent us a photo of a transformer nameplate from a competing quote. The unit was rated 1,000 kVA, 13.8 kV delta to 480Y/277 V, UL-listed — everything looked right until we read the temperature-rise line: 80&de...
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A utility engineer in Nairobi sent us an RFQ for a high altitude transformer last quarter — 1,000 kVA pad-mounted, 13.8 kV delta to 480Y/277 V, 65 K rise, UL-listed. The spec sheet looked like a hundred others we quote. Then our engineer asked ...
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