About Tamron-Zhejiang Tenglong Electric Appliance Co., Ltd

COMPANY

Zhejiang Tenglong Electrical Appliance Co., Ltd.

Fifty years of dedicated expertise in transformer tap changers.

Zhejiang Tenglong Electrical Appliance Co., Ltd., located on the shores of Sanmen Bay by the East China Sea, was founded in 1978 and is one of the earliest domestic enterprises dedicated to the design and manufacture of transformer tap changers. Drawing on decades of extensive experience in the design and production of transformer components, and integrating cutting-edge scientific theories with modern design principles, the company has developed numerous patented technologies, achieving exceptionally high product quality and establishing itself as a leading supplier of transformer tap changers in China. Upholding a people‑centered approach and conducting business with integrity, the company has consistently embraced the spirit of hard work, pioneering innovation, and continuous improvement, ensuring its sustained and sound growth.

Tenglong Company has a registered capital of RMB 13 million, occupies a factory site of 102 mu, and boasts strong technological R&D capabilities, state-of-the-art production equipment, and comprehensive testing facilities. Its annual switch output ranks among the highest in the industry. The company is certified under ISO quality, environmental, and occupational health and safety management systems, ensuring stable and reliable product quality. Its products are bestsellers across China, and it undertakes substantial direct‑supply and dedicated‑supply export orders each year, earning the trust of a broad base of domestic and international customers. Tenglong has been recognized with prestigious honors, including “Zhejiang Province Specialized, Fine, Distinctive, and Innovative SME,” “Zhejiang Province Science and Technology Enterprise,” and “National High‑Tech Enterprise.”

The product is registered under the trademark “Tenglong” and comprises three major series with over 6,000 specifications, primarily including:

1. No-load tap changer

(1) Non-excited tubular and drum-type tap changers (WDG series, WDG+WLG series, WSG series)

Rated voltage of 220 kV (with a maximum equipment voltage of 252 kV) and below, and rated current of 4,000 A and below; it supports three-phase interlocked operation, 1+2-phase operation, and single-phase operation, with operating modes including direct or interlocked actuation via the tank cover, tank bottom, or side walls.

(2) Non-excited cage-type tap changer (WSL series)

Rated voltage of 220 kV (with a maximum equipment voltage of 252 kV) and below, rated current of 3,000 A and below; available with various voltage regulation methods, enabling manual or electric operation from the top or side of the enclosure.

(3) Non-excited strip-type tap changers (WDT series, WST series)

Rated voltage of 110 kV (with a maximum equipment voltage of 126 kV) and below, rated current of 1600 A and below, available with various voltage regulation methods.

(4) Non‑excited disc-type tap changers (WDP series, WSP series)

Rated voltage of 35 kV (maximum equipment voltage 40.5 kV) and below, with a rated current of 400 A and below.

(5) Non-excitation cage-type tap changer (WSLD series)

Rated voltage of 35 kV (maximum equipment voltage: 40.5 kV) and below, with a rated current of 2000 A and below.

2. Oil-immersed load switch

Rated voltage of 35 kV (with a maximum equipment voltage of 40.5 kV) and below; rated currents of 630 A and 315 A; available in manual‑only and manual–electric combined configurations; with two‑position and four‑position switching stations, respectively intended for terminal‑type and ring‑network distribution transformers, as well as transformers for photovoltaic and wind‑power projects.

3. On-load tap changer

(1) SV-type on-load tap changers

Rated voltage: 35–66 kV (maximum equipment voltage: 40.5–72.5 kV); available in two rated maximum continuous currents—350 A and 500 A—primarily suitable for oil-immersed on-load tap-changing power transformers with ratings of 110 kV and below.

(2) F-series compound on-load tap changer

Rated voltage of 35 kV (with a maximum equipment voltage of 40.5 kV) and below; rated current of 400 A and below; for the 10 kV voltage class (with a maximum equipment voltage of 12 kV), the maximum operating voltage is 1,000 V; suitable for oil-immersed on-load tap-changing power transformers.

(3) VF Series Vacuum On-Load Tap Changers

Rated voltage: 10 kV (maximum equipment voltage: 12 kV), rated current: 1,000 A and below; rated voltage: 35 kV (maximum equipment voltage: 40.5 kV), rated current: 600 A and below; suitable for oil-immersed power transformers.

(4) VSP Series Vacuum Disc-Type On-Load Tap Changer

Rated voltage: 10 kV (maximum equipment voltage: 12 kV); suitable for oil-immersed distribution transformers with a capacity of 630 kVA and below.

(5) Vacuum‑type, permanent‑magnet, horizontal on‑load tap changer

Rated voltage of 10 kV (with a maximum equipment voltage of 12 kV) and below, and rated current of 63 A and below; suitable for oil-immersed distribution transformers.

(6) Dry-type vacuum on-load tap changer

Rated voltage of 10 kV (with a maximum equipment voltage of 12 kV) and below, and rated current of 165 A and below; suitable for dry-type distribution transformers.

4. Operating Mechanism

Various types of operating mechanisms compatible with the switch, including electric and manual operating mechanisms.

The company’s quality policy is: “Customer satisfaction is Tenglong’s pursuit.” We remain committed to a quality‑first approach, putting users first, building our business on quality, and winning through excellence. We are dedicated to designing and manufacturing tap changers tailored to diverse customer requirements, serving as a reliable partner to transformer manufacturers, and striving for mutual growth.

CULTURE

Quality Policy

Customer satisfaction is Tenglong’s pursuit.

Corporate Vision

Becoming a pioneering innovator in the field of transformer tap changers.

Corporate Values

Integrity, Innovation

HONOR