Rotary tap changer for oil-immersed transformers

1. Company introduction

   Liaoning Jinli Electric Power Electrical Appliance Co., Ltd was established in 2001 with a registered capital of 5 million yuan. It is a national high-tech enterprise specializing in the research and development, production, and sales of various types of transformers tap changers in China. It is also a national intellectual property advantage enterprise and has a provincial-level enterprise technology center.

   The products are mainly sold in more than 20 countries and regions such as South Korea, Russia, Switzerland, Australia, Thailand, India, Peru, etc.

   The main export products are No-excitation linear tap changers, Disc type tap changers, and Plate type tap changers, as well as 10~35KV On load tap changer.

2. Product introduction

   The immersed off-load tap changer is a device used for operating oil-immersed power transformers under the conditions of de-energization or off-load, to adjust the tap positions of the transformer coil and thereby alter the transformer ratio.

3.Product parameters

WSL II3 series outline drawing and installation dimensions

4.Product feature and application

Tap changers are core components for voltage regulation of oil-immersed transformers with a voltage class below 35kV, widely used in medium and low voltage power distribution systems.

Structurally, this type of tap changer features a compact design, simple mechanism and reliable performance. It is mostly designed for off-circuit tap changing, requiring the transformer to be fully powered off before gear adjustment. Made of high-strength insulating materials and wear-resistant conductive parts, it adapts well to the oil-immersed operating environment, with strong resistance to aging, vibration and temperature changes. Its operation is easy, needing only manual rotation to switch taps, and the maintenance workload is low during long-term operation.

In terms of application scenarios, it is mainly deployed in urban and rural distribution networks, industrial parks, residential communities and small power stations. It stabilizes output voltage by adjusting transformation ratio, effectively solving voltage deviation caused by load changes and line loss.

Due to low manufacturing cost, convenient installation and stable operation, these tap changers perfectly match the operational demands of 35kV and below distribution transformers. They have become the mainstream choice for voltage regulation in medium and low voltage power systems, guaranteeing safe and stable power supply for daily production and living.

5. Production details

Our company is a specialized manufacturer of general-purpose transformer tap changers, with a strong focus on precision production, rigorous processing, and comprehensive quality control. We implement standardized, traceable workflows across every stage—from raw material incoming inspection, CNC machining, and assembly to final performance testing.

Our dedicated production team follows strict operational protocols to ensure each component meets dimensional accuracy and material stability requirements. Key processes include automated assembly lines, precision welding, and tap changer voltage withstand testing, all verified by our in-house laboratory. Every finished product undergoes full functional testing, including product appearance, contact pressure, contact resistance and mechanical endurance checks, before leaving the factory.

6. Company qualification

Our company maintains a comprehensive management system to ensure product quality, environmental responsibility, and occupational health safety. We hold ISO 9001 Quality Management System certification, ISO 14001 Environmental Management System certification, and ISO 45001 Occupational Health and Safety Management System certification, reflecting our commitment to standardized operations across production, processing, and testing.

For international markets, our transformer tap changers comply with EU regulations, holding both CE marking and RoHS compliance certification. These credentials confirm that our products meet EU safety, health, and environmental protection requirements, including the restriction of hazardous substances as specified in the RoHS Directive.

With these certifications, we demonstrate consistent adherence to both domestic and international standards, ensuring reliable, safe, and environmentally sound products for customers worldwide.

 7. Deliver , shipping and serving transport packaging method

Tap changer packaging method will be carton, wooden box and wooden pallet etc.

Samples picture shows as following:

8. FAQ

• About MOQ, we don't have it. But if you order more that it will reduce transportation costs.
• About lead time, it will depend on the quantity of the order.
• About payment term, we will do 50%TT before production and 50%TT before delivery.
• About shipment term, we can do FOB or CIF etc.