De-Energized Tap Changer (DETC) for single-phase transformers

Established in 2001, Liaoning Jinli Electric Power Electrical Appliance Co., Ltd. has RMB 5 million registered capital. As a national high‑tech enterprise, we dedicate ourselves to R&D, production and global supply of full‑range transformer tap‑changers.

We are a National Intellectual Property Advantage Enterprise with a provincial enterprise technology center supporting ongoing technical upgrades.

We supply products to over 20 markets worldwide covering South Korea, Russia, Switzerland, Australia, Thailand, India, Peru and more. Our main export scope consists of 10‑35 kV on‑load tap‑changers, together with linear, disc and plate‑style off‑circuit tap‑changers.

As key voltage‑regulating components for oil‑immersed transformers up to 35 kV, tap changers find extensive application in medium‑ and low‑voltage distribution systems.

This series tap changer adopts a compact structural layout with straightforward mechanism and high operational reliability. Belonging to the off‑circuit tap‑changing type, it must be operated only when the transformer is completely de‑energized for tap position adjustment. Constructed from high‑strength insulation materials and wear‑resistant conductive components, the product is well‑suited for oil‑immersed working conditions, delivering outstanding resistance against ageing, vibration and temperature fluctuation. Simple manual rotation completes tap switching, bringing minimum maintenance efforts over long‑term service.

Typical application fields cover urban‑rural distribution networks, industrial parks, residential compounds and small‑scale power stations. By adjusting the transformer ratio, the tap changer stabilizes output voltage and mitigates voltage deviation resulting from load variation and line losses.

Benefiting from cost‑effective production, easy installation and stable performance, these tap changers are highly compatible with 35 kV‑and‑below distribution transformers. They serve as the mainstream voltage‑regulation solution for medium‑low‑voltage power systems, ensuring safe and reliable power supply for industrial production and residential consumption.