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Product Introduction

20kV and 35kV oil-immersed transformers are core equipment in medium-voltage power transmission and distribution networks, widely used in key applications such as urban and rural grid upgrades, industrial plant power distribution, and grid integration of new energy power stations. These products utilize high-quality mineral insulating oil as both cooling and insulating medium, combined with a fully sealed corrugated tank structure. They offer outstanding technical advantages, including low loss, high overload capacity, and excellent short-circuit withstand capability, enabling long-term stable operation under complex working conditions. Among them, the 35kV on-load tap-changing transformer series is manufactured with advanced modular production technology and equipped with the "four remote" functions—remote signaling, remote measurement, remote regulation, and remote control. Through computer-based remote control, these transformers enable unattended management of substations.

Technical Parameters
Technical Parameters of 20kV Class S11 Series Oil-immersed Transformers with No-load Voltage Regulation

Note:
① For three-phase transformers with a rated capacity of 500kVA or below, the load loss values above the diagonal line in the table apply to connection groups Dyn11 or Yzn11, while the values below the diagonal line apply to connection group Yyn0.

② The performance parameters in the table also apply to three-phase transformers with a dual high-voltage rating of 20(10)kV.

Technical Parameters of 35kV Class S11 Series Oil-immersed Power Transformers with No-load Voltage Regulation

Note:
① A voltage regulation range of ±5% or ±2×2.5% can be provided for the high-voltage side.

② For transformers with a low-voltage rating of 10.5kV, products with connection group symbol Dyn11 are available.

③ The provided dimensions are for reference only during selection. The final dimensions shall be based on the product outline drawing.

Technical Parameters of 35kV Class SZ11 Series On-load Tap-changing Oil-immersed Power Transformers

Note:
① For transformers with a low-voltage rating of 10.5kV, products with connection group symbol Dyn11 can be provided.
② The maximum current tapping position is the -7.5% tap.
③ The provided dimensions are for reference only during selection. The final dimensions shall be based on the product outline drawing.