Non-Excitation Tap Changer

A De-Energized Tap Changer (DETC), also known as a No-Load Tap Changer, is a vital voltage regulation component used in power transformers and distribution transformers. Unlike On-Load Tap Changers (OLTC), a DETC operates only when the transformer is de-energized, ensuring safe and stable voltage adjustment without electrical load.

As an experienced De-Energized Tap Changer manufacturer and supplier, we provide a complete range of high-quality DETC solutions designed for long service life, mechanical reliability, and precise voltage regulation. Our products are widely applied in distribution transformers, medium and high-voltage power transformers, and special transformer projects.

Complete Range of De-Energized Tap Changers

Our no-load tap changer portfolio includes multiple structural designs to meet different transformer capacities, installation requirements, and operational environments. Each series is manufactured under strict quality control to ensure consistent electrical performance and mechanical durability.

WDG / WDG + WLG / WSG Series – Cylindrical & Drum-Type DETC

The WDG, WDG + WLG, and WSG series cylindrical and drum-type De-Energized Tap Changers are designed for stable voltage regulation under no-load conditions. Their compact structure and proven mechanical design make them suitable for a wide range of transformer ratings.

These DETCs feature smooth switching performance, high mechanical endurance, and reliable contact pressure, ensuring consistent operation throughout the transformer’s service life. They are commonly used in standard distribution and medium-voltage power transformers.

WSL Series – Cage-Type De-Energized Tap Changer

The WSL series cage-type DETC is engineered for enhanced mechanical strength and long-term operational stability. Its cage structure evenly distributes switching forces, reducing wear on contacts and improving overall durability.

This series is particularly suitable for power transformers operating in industrial plants and utility substations, where mechanical robustness and stable performance are essential.

WDT / WST Series – Strip-Type De-Energized Tap Changer

The WDT and WST strip-type De-Energized Tap Changers use precision strip contacts to achieve accurate no-load voltage switching. Their compact size and low mechanical resistance make them easy to install and maintain.

These models are ideal for distribution transformers and industrial transformers that require controlled voltage adjustment during scheduled shutdowns.

WDP / WSP Series – Disc-Type De-Energized Tap Changer

The WDP and WSP disc-type DETCs are designed for high-precision tap selection and long-term electrical reliability. The disc contact mechanism ensures stable contact performance and extended mechanical life.

They are widely applied in power transformers and customized transformer projects where precise voltage regulation is critical.

WSLD Series – Cage-Type Motorized De-Energized Tap Changer

The WSLD series motorized cage-type De-Energized Tap Changer integrates a robust cage structure with a motor-driven operating mechanism. This design allows automated and remote tap changing when the transformer is de-energized.

It is an ideal solution for industrial transformers, automated substations, and remote power distribution systems that require safe and efficient voltage adjustment without manual intervention.

Why Choose Our De-Energized Tap Changers

As a professional No-Load Tap Changer supplier, we focus on product reliability, standardized manufacturing, and application flexibility. Our DETCs are designed to meet international transformer standards and can be customized to suit specific voltage levels, tap positions, and installation layouts.

With stable quality, competitive pricing, and strong technical support, our De-Energized Tap Changers help transformer manufacturers and power utilities achieve safe voltage regulation and long-term operational efficiency.

Typical Technical Parameters

Parameters can be customized according to transformer design and project requirements.