S11-M Series 10 kV Three-Phase Fully Sealed Oil-Immersed Distribution Transformer

The S11‑M series fully sealed distribution transformers eliminate the oil conservator, instead using the corrugated tank’s finned walls as heat‑dissipating cooling elements. These fins expand and contract with changes in the oil level, isolating the transformer interior from the atmosphere and preventing oil degradation, insulation moisture absorption, and aging, thereby enhancing operational reliability. The tank welds are full, smooth, even in thickness, and free of leaks. The core is constructed from 0.23 mm high‑permeability laser‑grooved laminations arranged in a stepped five‑level joint structure, which helps reduce no‑load losses and no‑load current, making this a new‑generation environmentally friendly product. Anti‑loosening nuts are used to secure and clamp the core. The high‑voltage windings are multi‑layered, with interlayer insulation provided by adhesive‑coated paper to enhance mechanical strength. The low‑voltage windings are either layered or of a novel helical design; interlayer insulation also employs adhesive‑coated paper, and the low‑voltage windings feature formed end rings that provide gapless, complete support, ensuring excellent mechanical strength. For pressure protection, a pressure relief valve is installed; for gas protection, QJ4‑type gas relays are used for units above 800 kVA. Units of 1,000 kVA and above are equipped with remote‑readout temperature gauges for monitoring oil temperature at a distance.

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Oil-Immersed Power Transformer Series

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Product Description

　　Product Overview:

　　The S11-M series fully sealed distribution transformers eliminate the oil conservator, instead using the corrugated tank’s finned walls as heat‑dissipating cooling elements. These fins expand and contract with changes in the oil level, isolating the transformer interior from the atmosphere and preventing oil degradation, insulation moisture ingress, and aging, thereby enhancing operational reliability. The tank welds are full, smooth, even in thickness, and free of leaks. The core is constructed from 0.23 mm high‑permeability laser‑grooved laminations arranged in a stepped five‑step lamination structure, which helps reduce no‑load losses and no‑load current, making this a new‑generation environmentally friendly product. Anti‑loosening nuts are used to secure and clamp the core. The high‑voltage windings are multi‑layered, with interlayer insulation provided by adhesive‑coated paper to enhance mechanical strength. The low‑voltage windings are either layered or of a novel helical design; interlayer insulation also employs adhesive‑coated paper, and the low‑voltage windings feature formed end rings that provide gapless, complete support, ensuring excellent mechanical strength. For pressure protection, a pressure relief valve is installed; for gas protection, QJ4‑type gas relays are used for units above 800 kVA. Units of 1,000 kVA and above are equipped with remote‑readout temperature gauges for monitoring oil temperature at a distance.

　　Ordering Instructions:
　　When placing your order, please provide the following parameters:
　　1. Product Model
　　2. Rated Capacity
　　3. Voltage Combination
　　4. Scope of Adjustment
　　5. Frequency
　　6. Connection Group Designation
　　7. Short-circuit impedance
　　8. For products with special requirements, specify the technical specifications.

　　Technical Data Sheet for S11-M Series 10 kV Three-Phase Fully Sealed Oil-Immersed Distribution Transformers

Rated Capacity ( k VA)	Rated voltage		Connection Group	No-load current ( %)	No-load loss ( W)	Load loss ( W)	Impedance voltage ( %)
Rated Capacity ( k VA)	High pressure ( kV )	Low pressure ( kV )	Connection Group	No-load current ( %)	No-load loss ( W)	Load loss ( W)	Impedance voltage ( %)
30	6 ±2×2.5% or 6.3 ±2×2.5% or 10 ±2×2.5%	0.4	Yyn0 Dyn11	2.1	100	600/630	4
50				2.0	130	870/910
80				1.8	180	1250/1310
100				1.6	200	1500/1580
125				1.5	240	1800/1890
160				1.4	280	2200/2310
200				1.3	340	2600/2730
250				1.2	400	3050/3200
315				1.1	480	3650/3830
400				1.0	570	4300/4520
500				1.0	680	5150/5410
630				0.9	810	6200	4.5
800				0.8	980	7500
1000				0.7	1150	10300
1250				0.6	1360	12000
1600				0.6	1640	14500
2000				0.6	1960	17800	5.5
2500				0.5	2310	20700	5.5

Note: For transformers with a rated capacity of 500 kVA or less, the load loss values above the diagonal line in the table apply to the Yyn0 connection group, while those below the diagonal line apply to the Dyn11 connection group.

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