23
2026
-
09
Technological Evolution of Oil-Immersed Transformers: A Brief Analysis of Applications for the S13–S22 Series, On-Load Tap Changers, and Underground Transformer Products
Oil-immersed power transformers remain the workhorse in power grids, large industries, and new‑energy step‑up substations, thanks to their cost advantage, strong overload capability, and mature technology. As energy‑efficiency standards continue to tighten, older S11 models are gradually being replaced by low‑loss copper‑wound oil‑immersed transformers in the S13, S20, and S22 series, while market demand for on‑load tap changers, underground installations, and combined American‑style pad‑mounted substations keeps rising.
S13‑S22 no-excitation voltage-regulating oil-immersed transformers are suitable for distribution networks and standard industrial plants; tap changing is performed during a power outage. SZ13‑SZ22 on-load voltage-regulating transformers can automatically or manually adjust voltage while energized, making them ideal for locations with significant voltage fluctuations at the grid’s end, large industrial enterprises, and research facilities, thereby ensuring stable voltage for end-use equipment. S (B) H15‑M sealed amorphous alloy oil-immersed transformers feature a fully sealed design, virtually maintenance-free operation, and markedly low no-load losses, making them well suited for distribution stations operating under light load conditions over extended periods.
Underground transformers S (13‑22)‑M・D are installed inside a pit, with only the enclosure visible above ground. They are ideal for urban landscape roads and commercial areas, helping to address land scarcity and enhance the cityscape. When using underground transformers, it is crucial to carefully design the pit for drainage, corrosion protection, and moisture resistance; otherwise, equipment water ingress and failure are highly likely. The ZGS series combined transformer (American‑style pad-mounted substation) integrates load switches and fuses within the oil tank, featuring a compact structure and being widely used in urban distribution networks and distributed photovoltaic step-up applications.
110kV–220kV ultra-high-voltage oil-immersed transformers, designed for large substations, leverage simulation software to optimize the core, windings, and tank across all dimensions, aiming for low partial discharge, low noise, and low losses to ensure reliable power transmission in major energy projects.
When procuring oil-immersed transformers, in addition to paying attention to loss parameters, winding material, sealing technology, tank corrosion protection, and protective device configuration all directly affect the equipment’s reliability over its entire lifecycle. Shenyang Guangchangyun Power Equipment offers oil-immersed transformers across the full voltage range of 10 kV–220 kV, including standard distribution transformers, on-load tap changers, underground transformers, and specialized packaged units for photovoltaic and wind power applications. The company also provides supporting electrical design and power engineering construction services, serving diverse projects in the steel, chemical, real estate, and power grid renovation sectors.
Contact Us
Service Phone:
Company Address
A005145 and A005146 Booth on the 5th Floor of Comprehensive Hall, No.10, Hunnan West Road, Hunnan District, Shenyang City