Technology of the SZ11 Series 35 kV Three-Phase On-Load Tap-Changing Oil-Immersed Power Transformer

The SZ11 and SZ13 series on‑load tap‑changing power transformers are designed using specialized transformer design software, ensuring an advanced design, a rational structure, and high‑quality material selection. Their performance parameters comply with the GB 1094 standard “Power Transformers” and the GB 6451 standard “Technical Parameters and Requirements for Three‑Phase Oil‑Immersed Power Transformers.” These transformers are suitable for urban and rural industrial and agricultural power grids and play a significant role in energy conservation and environmental protection.

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Oil-Immersed Power Transformer Series

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Product Description

　　Product Overview:

　　　　The SZ11 and SZ13 series on‑load tap‑changing power transformers are designed using specialized transformer design software, featuring advanced engineering, a well‑thought‑out structure, and high‑quality materials. Their performance parameters comply with the GB 1094 standard “Power Transformers” and the GB 6451 standard “Technical Parameters and Requirements for Three‑Phase Oil‑Immersed Power Transformers.” These transformers are suitable for urban and rural industrial and agricultural power grids and play an important role in energy conservation and environmental protection.

　　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 SZ11 Series 35 kV Three-Phase On-Load Tap-Changing Oil-Immersed Power Transformers

Rated Capacity (kVA)	Rated voltage		Connection Group	No-load current (%)	No-load loss (W)	Load loss (W)	Impedance Voltage (%)
Rated Capacity (kVA)	High voltage (kV)	Low voltage (kV)	Connection Group	No-load current (%)	No-load loss (W)	Load loss (W)	Impedance Voltage (%)
2000	35 ±3×2.5% or 38.5 ±3×2.5%	6.3 10 10.5	Yd11 YNd11	0.8	2160	19230	6.5
2500				0.8	2550	20640	6.5
3150				0.72	3030	24710	7.0
4000				0.72	3630	29155
5000				0.68	4350	34200
6300				0.68	5280	36765	7.5
8000				0.6	7380	40610
10000				0.6	8700	48050
12500				0.56	10260	56850	8.0
16000				0.54	11400	70320
20000				0.54	13500	82780