S11-M Series (20 kV) Three-Phase Fully Sealed Oil-Immersed Distribution Transformer

The S11-M and S13-M (20 kV) series fully sealed distribution transformers use the corrugated tank fins 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 ensure leak‑proof integrity. The core is constructed from 0.23 mm high‑permeability laser‑grooved laminations arranged in a stepped five‑step joint structure, which helps reduce no‑load losses and no‑load current, making this a new generation of environmentally friendly products. Anti‑looseness 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, full 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 and S13-M (20 kV) series fully sealed distribution transformers use the corrugated tank fins 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 ensure leak‑proof integrity. The core is constructed from 0.23 mm high‑permeability laser‑grooved laminations arranged in a stepped five‑step joint structure, which effectively reduces no‑load losses and no‑load current, making this a new‑generation environmentally friendly product. Anti‑loosening nuts are employed for core clamping and tightening. 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 utilizes adhesive‑coated paper, and the low‑voltage windings feature formed end rings that provide gapless, full 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. Transformers rated at 1,000 kVA and above are equipped with remote‑readout temperature gauges for monitoring oil temperature.

　　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 (20 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	20 ±2×2.5% or 22 ±2×2.5% or 24 ±2×2.5%	0.4	Yyn0 Dyn11	2.1	90	640/690	5.5
50				2.0	130	960/1010
80				1.8	180	1370/1440
100				1.6	200	1650/1730
125				1.5	240	1980/2080
160				1.4	290	2420/2540
200				1.3	340	2860/3000
250				1.2	400	3320/3520
315				1.1	480	4010/4210
400				1.0	570	4730/4970
500				1.0	680	5660/5940
630				0.9	810	6820	6
800				0.8	980	8250
1000				0.7	1150	11330
1250				0.7	1350	13200
1600				0.6	1630	15950
2000				0.6	1960	19140
2500				0.5	2340	22220

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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