News >  A loud shout of success for ZTT!
The first, global manufacturer for 500kV Insulated XLPE HVAC Submarine Optic Fiber Composite cable.

A loud shout of success for ZTT!
The first, global manufacturer for 500kV Insulated XLPE HVAC Submarine Optic Fiber Composite cable.

2019-4-17 10:13:12

On Jan 3, 2019,Zhongtian Technology Submarine Cable Co., Ltd [ZTTSC] successfully delivered and passed the “Acceptance Test” for the 500kV HVAC XLPE insulated submarine fiber optic composite cable, the highest voltage category in the world! The cable was developed to enable the Zhejiang project - the Zhejiang Zhoushan 500kV networking transmission & transformation project.

The Zhejiang Zhoushan 500kV networking transmission & transformation project is a trans-region & cross-sea networking project. A project with the largest investment value amidst a very harsh construction environment. The construction of the project will fill the gap of the 500kV grid for the Zhoushan Islands New Area, Zhejiang, providing a powerful electric drive for its development; and greatly promoting the construction of “The Belt and Road” initiative.



In the process of successful implementation and completion of the production of 500kV ultra-high voltage submarine cable, Zhongtian Technology [ZTT] heavily increased its investment in scientific development to conduct the research on ultra-high voltage submarine cable materials and the design manufacturing process as well as testing technologies.

Combining years of experience in the successful development of high-voltage submarine cables, ZTT made multi-faceted technological breakthroughs in the area of concentration and purity of ultra-high voltage material of 500kV cross-linked submarine cable, insulation extrusion process, soft joint development and quality assurances, intermediate grounding technology of lead bushing, waterproof design of maintenance joints and mechanical protection technology, and solving many highly complex technical issues to become the first manufacturer to achieve the insulated 500kV XLPE submarine cable system [including soft joint and maintenance joint] Type Test and Pre-Qualification tests.

ZTT has always been regarded as the pioneer; a highly acclaimed and accredited submarine cable manufacturer in China; the only entity to have received such approval in the New Technological Product category. The award was declared through an official appraisal organized by the China Electricity Council and Industry and Information Technology Committee for achieving a long continuous extrusion production of 18.45 kilometers within a 23 days period.

The successful development event, thus bestowed ZTTwith the title of the first global manufacturer for 500kV HVAC, XLPE with no-joint insulated submarine fiber optic composite cable manufacturer; the longest length record holder in the world.

Under the guidance of the China National Strategy for accelerating the construction of the maritime power, ZTT developed an advanced industrial development strategy, entitled “system-oriented development of submarine cable and development from submarine cable engineering to General Contract”, and founded the ZTT Marine Industry Group, including the olive branch of the ZTT Marine Cable Co., Ltd., ZTT Ocean System Co., Ltd., Shanghai Yuanwei Construction Engineering Co., Ltd., ZTT Ocean Engineering Co., Ltd.; to respectively process the research, development and production of the submarine cable, submarine cable connector and submarine monitoring system, the operation and maintenance of submarine cable and marine construction, construction of wind power foundation and installation and maintenance of wind turbine; thus creating and completing a system to serve to realize the “powerful ocean” strategies for the submarine cable engineering, offshore wind power and seabed observation network.


Riding the waves with the right wind speed; supported by well-timed global opportunities ZTTSC continues to make “the vital cable connections”; while adhering to the development concept of “Precision Manufacturing & Safe Production”.

ZTTSC will soon carry out another smoother delivery of the second phase transmission cable of the “Zhoushan 500kV Networking North Passage” project in Zhejiang.

The inaugural on-site acceptance ceremony was attended by Mr. Xie Shuhong, Chief Engineer of the ZTT Group, Mr. Xue Jianling, General Manager of ZTTSC, and Mr. Hu Ming, Chief Engineer of ZTTSC.


ZTT Group

ZTT Group, a global and leading manufacturer is active in the research development, design, production, supply, and installation complete with a wide product range for telecom, power, renewable energy and in the oil & gas industries. 

ZTT was listed on the Shanghai Stock Exchange (Stock Code 600522.SH) on Oct 24, 2002. ZTT has broken through the US$7.84 billion marks in revenue in 2018. A truly global company whose products are shipped to 147 countries. ZTT stronghold comprises 58 overseas branch offices, 6 registered subsidiaries, over 60 plants (inclusive of 6 overseas plants), 7 research & development centers and over 15,000 employees.