Zhongtian Power has successfully developed extremely cold resistant (-70°C), low-loss optical fiber composite overhead ground line

Zhongtian Power Optical Cable Co.
, Ltd.
made a major technological breakthrough in 2017 and developed an optical fiber composite overhead ground line (OPGW) that is resistant to -70°C application, which solved the problem that conventional OPGW is difficult to operate in the extreme cold environment of -70°C in Siberia and other regions, and provided new technical solutions
for the extension of power communication to the Arctic and other extremely cold regions.

The global energy Internet is a strong smart grid with UHV power grid
as the backbone and global interconnection.
As the main carrier of power system communication, OPGW provides necessary means
for the dispatching, operation and management of the global energy Internet.
But this role is often compromised
in extremely cold regions.

Zhongtian Electric Power Optical Cable Co.
, Ltd.
developed -55 °C, -60 °COPGW in the early stage, after the successful application of Tibet-China networking and Qinghai-Tibet networking projects, in 2017 made a major technological breakthrough, a few days ago, this extremely cold resistant (-70 °C), low loss OPGW product passed the expert review and appraisal
organized by the China Electricity Council.

Li Ming, chief engineer of Zhongtian Electric Power Optical Cable Co.
, Ltd.
, said that the glass transition temperature of ordinary optical fiber coating and optical fiber filling paste is about -50 °C - -60 °C, and at -70 °C, these materials are in a "vitrified" state, losing the function of external buffer protection of optical fiber, resulting in a significant increase in optical fiber attenuation, posing a threat
to optical fiber communication.
Therefore, in order for OPGW to operate in extreme cold conditions of -70°C, it is necessary to develop new extremely cold resistant optical fibers and filling pastes
.
After nearly a year of research, the technical team of Zhongtian Electric Power Optical Cable Co.
, Ltd.
has developed an extremely cold-resistant optical fiber that can meet the use of extremely cold conditions, and developed extremely cold resistance (-70 °C), low-loss OPGW by optimizing the selection of filling paste and the design of residual length, and passed the type test and extreme cold and low temperature test of Shanghai National Cable Testing Center, and the technical performance indicators are in line with relevant national and industry standards
.

The appraisal committee is composed of nearly 20 senior experts such as State Grid, China Electric Power Research Institute, Shanghai Electric Power Research Institute, etc.
, the experts of the appraisal committee carefully listened to the introduction, consultation and questioning, realistically evaluated, formed and passed the expert group review and appraisal opinions, unanimously agreed that the extremely cold resistance (-70 °C), low loss OPGW in material selection, attenuation characteristics, process technology and other aspects of breakthroughs, R & D material specifications are complete, in line with new product technology identification requirements, comprehensive technical performance has reached the international leading level
。