Transnineelectric

There is no single safe distance for an oil-immersed transformer. Chinese codes quote 5–6 m from buildings (GB 50053-94, GB 50016-2006) and 1.5–3 m from combustibles, fire gear, and roadways. The U.S. uses a different rule: NEC Article 450 and NFPA 850/851 set the spacing by installation type,...

Amorphous alloy transformers are rated on China's GB 20052 scale from grade 1 (best) to grade 5, and the grade tracks two numbers that hit your budget: no-load loss (P₀) and load loss (Pₖ). U.S. buyers don't see those grades — they check DOE 10 CFR 431 Subpart K compliance and the loss values ...

A transformer fits the job when its voltage, capacity, cooling, and insulation line up with the load and the site — not when the nameplate looks impressive. Start with the primary and secondary voltages, size the kVA to about 75–80% of the continuous load, then weigh oil against dry, short-cir...

Amorphous alloy and dry-type describe two different things. The first is the core material — amorphous metal versus conventional silicon steel. The second is the cooling medium — air/dry versus oil. An amorphous transformer can be either dry-type or oil-immersed, so the two are not two competi...

Amorphous alloy describes the core material, not the cooling method — so an amorphous transformer comes in both forms. You can buy a dry-type cast-resin unit (the SCBH family) or an oil-immersed unit (the SH/SBH family). The core cuts no-load losses 70–80% below silicon steel either way; the d...

The SCB14 cast-resin dry-type transformer is a non-flammable, low-maintenance unit built for data centers, hospitals, and commercial buildings where fire safety is non-negotiable. This procedure lays out the pre-start checks, energizing and shutdown steps, monitoring, and emergency actions tha...

A Buchholz relay is the gas- and oil-actuated device mounted in the pipe between a liquid-filled transformer's tank and its conservator. Slow gas buildup from an incipient fault drives an alarm; a fast oil surge from a severe fault trips the unit off the system. It catches winding turn-to-turn...

Before anyone touches an oil-immersed transformer for service, testing, or fault work, it has to be brought to a verified zero-energy state and bonded to ground. In U.S. practice that means de-energize both the high- and low-voltage sides, apply Lockout/Tagout, test for absence of voltage, the...

The S20 oil-immersed transformer is normally set on a concrete pedestal at least 300 mm (about 12 in) above finished grade, with a perimeter drainage channel that keeps the tank base clear of standing water. Pole-mounted versions follow a different rule entirely — roughly 2.5 m from grade to t...

Any transformer steps voltage down or up, and the S22 is no exception — feed the high-voltage winding and you get a lower voltage on the other side; feed the low-voltage winding and you get a higher one. The ratio is simply the turns ratio: U2 / U1 = N2 / N1. What actually decides whether an S...