Products Description
A 35 kV three-phase oil-immersed distribution transformer is the step-down unit that takes medium-voltage 35 kV power from the grid and delivers low voltage (commonly 0.4 kV) to factories, substations, ports, airports, and industrial complexes. The oil-immersed design uses mineral oil both to cool the windings and to insulate them, which lets the unit handle large load swings while staying quiet and efficient.
GNEE's S13 series is built as a low-loss, low-noise, low-partial-discharge product: the core uses high-grade silicon steel to cut no-load loss, and the windings use a low axial short-circuit-force structure so the transformer survives fault currents without deforming. For an overseas buyer the real decisions are the rated capacity (kVA), the high/low voltage and tapping range, the vector group, the loss class (efficiency), and whether on-load tap changing is needed to hold voltage under varying load. Specifying those correctly avoids both an undersized unit that overheats and an oversized unit that wastes capital.
S13-35kV Technical Parameters Of Three Phase Oil Immersed Transformer
| Item | Parameter | Value (or confirm with GNEE STEEL) |
| 1 | Rated capacity | 50–2500 kVA (S13 series) |
| 2 | High voltage | 35 kV (tapping ±2×2.5% / ±5%, confirm) |
| 3 | Low voltage | 0.4 kV |
| 4 | Vector group | Dyn11 / Yyn0 |
| 5 | Impedance | ~6.5% (confirm per capacity) |
| 6 | No-load loss | From 160 W (50 kVA) to 2360 W (2500 kVA) |
| 7 | Load loss | From ~1140 W to ~23200 W (confirm values) |
| 8 | Frequency | 50 / 60 Hz (confirm) |
| 9 | Tap changer | On-load tap changer optional (manual/auto) |
| 10 | Type | Three-phase oil-immersed distribution |
Oil Immersed Type Transformers Characteristic
1. The coil adopts a low axial short-circuit force structure. When the transformers is short-circuited, it can greatly reduce the axial short-circuit force and greatly improve the ability of withstanding short-circuit.
2. All the bolts and nuts on the cover surface are made of 304 stainless steel, which enhances the rust prevention ability of the transformers.
3. Each sealing rubber ring adopts the best rubber material in China, which greatly prolongs the service life of the sealing rubber ring.
4. The transformer body adopts a high-reliability support structure to ensure reliable compression of the upper and lower parts of the coil. The entire body structure improves the ability of withstanding short-circuited.
5. This not only reduces the no-load loss of the transformers, but also ensures that the core flux is not saturated when the transformers is operating under voltage, so that the third harmonic of the transformer is small.
Oil Type Transformers
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GNEE Electric Co., Ltd. was established in 2008 and is located in Anyang City, Henan Province. It is a digital management enterprise integrating R&D, production, sales and installation of power equipment. The company's products cover 6kv, 11kv, 22kv, 35kv and other power transformers, distribution transformers, box-type substations, high and low voltage switch cabinets, wind power, photovoltaic power generation equipment, etc. GNEE products are sold to the Middle East, North America, South America, Europe, Southeast Asia, Africa and other regions, covering more than 50 countries.
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