ODM SZ11,SFZ11 Type 35kV Series On-load Regulator Power Transformer Supplier, Manufacturer

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ODM SZ11,SFZ11 Type 35kV Series On-load Regulator Power Transformer Supplier, Manufacturer

The SZ11, SFZ11 Type 35kV Series On-load Regulator Power Transformer, complies with the national standards GB 1094 Power Transformers and GB/T 6451 Technical Parameters and Requirements for Three-Phase Oil-Immersed Power Transformers. A series of major reforms in materials, processes, and structures have been adopted, bringing its electrical performance up to the advanced international level of similar products. Featuring high efficiency and low loss, it can save a significant amount of power consumption and operating costs, delivering remarkable social benefits. It is a new product promoted by the state and one of the most popular among users.

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Product Description

Type & Meaning

1	Three-Phase Oil-Immersed Transformer
2	Forced Air Cooling
3	On-Load Tap-Changing
4	Performance Level Code
5	Rated Capacity (kVA)
6	Voltage Class (kV)

Product Features

Equipped with on-load tap-changing, it meets user voltage requirements, improves power supply quality, and saves energy.

The core is made of high-quality high-permeability silicon steel sheets with fully mitered step-lap joints, which reduces the core's no-load loss and no-load current.

The high-voltage winding adopts a continuous type, and the low-voltage winding is either continuous or spiral. The ampere-turn distribution is balanced, and the mechanical strength is high. A new insulation structure is applied to the transformer body, enhancing the short-circuit withstand capability.

The oil tank is of barrel or bell-jar type, with corrugated walls for an aesthetic and compact appearance as well as high mechanical strength. Precision-machined flanges are used for key connections to prevent leakage.

Product Display

SFZ11 On-load Regulator Power Transformer

SZ11,SFZ11 Type On-load Power Transformer right

Standards

GB 1094.1~2-1996 Power Transformers
GB 1094.3,5-2003 Power Transformers
GB/T 6451-1999 Technical Parameters and Requirements for Three-Phase Oil-Immersed Power Transformers

Technical Parameters

Technical Parameters of SZ11-2000~12500/35kV Series Three-Phase Oil-Immersed On-Load Tap-Changing Power Transformers

Type	Voltage Combination			Connection Symbol	No-Load Loss (kW)	Load Loss (kW)	Short-Circuit Impedance (%)	No-Load Current (%)	Weight (kg)		Overall Dimensions (mm)	Wheelbase (mm)
Type	High-Voltage (kV)	Tap-Changing (%)	Low-Voltage (kV)	Connection Symbol	No-Load Loss (kW)	Load Loss (kW)	Short-Circuit Impedance (%)	No-Load Current (%)	Oil Weight	Total Weight	Length(L)×Width(W)×Height(H)	Wheelbase (mm)
SZ11-1600/35	35 38.5	±3% ×2.5	10.5 6.3 11	Yd11	2.3	18.5	6.5	1	1450	5050	2850×2050×2300	820×820
SZ11-2000/35					2.88	20.25		0.8	1600	5900	3020×2250×2650	1070×1070
SZ11-2500/35					3.4	21.73		0.8	1750	6950	3150×2280×2650	1070×1070
SZ11-3150/35					4.04	26.01	7	0.72	1950	7900	3300×2350×2900	1070×1070
SZ11-4000/35					4.84	30.69		0.72	2250	9100	3350×2500×3000	1070×1070
SZ11-5000/35					5.8	36		0.68	2500	10900	3500×2650×3050	1070×1070
SZ11-6300/35					7.04	38.7	7.5	0.68	2650	12500	3800×3150×3300	1070×1070
SZ11-8000/35				YNd11	9.84	42.75		0.6	3350	15500	4200×3160×3400	1475×1475
SZ11-10000/35					11.6	50.58		0.6	3750	18000	4500×3200×3500	1475×1475
SZ11-12500/35					13.68	59.85	8	0.56	4250	23500	4800×3200×3600	1475×1475
SZ11-16000/35					16.46	74.02		0.54	6300	26000	4900×3400×3700	1475×1475
SZ11-20000/35					19.46	87.14		0.54	7500	32500	5000×3500×4000	1475×1475

Note:
1. For performance parameters, overall dimensions, and weight data of 35kV class transformers with larger capacities, please consult our company.
2. For transformers with a capacity of 8000kVA and above, forced air cooling devices can also be provided according to user requirements (type: SFZ11).
3. The weight and overall dimension data in the table are for reference only; no prior notice will be given for any changes.

Frequently Asked Questions (FAQ)

What is the primary advantage of on-load tap-changing (OLTC)?

On-load tap-changing allows the transformer to adjust voltage ratios dynamically while maintaining a continuous power supply under load conditions. This stabilizes output voltage, optimizes power quality, and contributes to energy savings.

What is the difference between SZ11 and SFZ11 models?

The 'SZ11' model utilizes natural oil cooling (ONAN), whereas the 'SFZ11' designation denotes the addition of forced air cooling (ONAF), typically implemented on capacities of 8000kVA and above to increase heat dissipation capability.

How does the core construction reduce energy loss?

The magnetic core is constructed from high-permeability grain-oriented silicon steel laminations with fully mitered step-lap joints. This advanced configuration significantly minimizes magnetic reluctance, which reduces no-load loss and no-load current.

How does the transformer prevent oil leakage over time?

The transformer tank is built with high structural rigidity using precision-machined connection flanges, premium-grade sealing gaskets, and either barrel or bell-jar corrugated tank structures designed to withstand internal pressure and prevent fluid seepage.

Are customized voltage combinations or larger capacities available?

Yes. Custom voltage combinations, non-standard connection configurations, and larger power ratings exceeding 20000kVA can be engineered to fulfill specific regional or industrial operating parameters upon consultation.

ODM SZ11,SFZ11 Type 35kV Series On-load Regulator Power Transformer Supplier, Manufacturer

Product Description

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