Electric Power Research Institute, China Southern Power Grid

Shenzhen Power Supply Co., Ltd

Yifan Zhang

Bin Feng

Wenbo Zhu

Xiaolin Li

Mingli Fu

Lei Jia

Zhengwen Liu

Xi Chen

Bin Zhang

Shuai Hou

Baojun Hui

Yunpeng Zhan

Lingmeng Fan

Yongjie Nie

Guoxing Wu

Shu Xu

Xiao Chen

The present application provides a high-voltage cable insulation material continuous extrusion processing characteristic evaluation and optimization method and apparatus. The method comprises: continuously extruding a material under test as a melt, measuring and recording an inlet pressure P, a mass growth rate w, and the diameter D' of a melt sample strip, and obtaining apparent shear viscosity η(t) (step A1); obtaining an outlet expansion rate δ (step A2); recording and displaying curves η(t) and δ(t), and treating the time corresponding to an increase of a set percentage on the curves as a cross-linking starting time TX (step A3); selecting a reference sample for testing, and determining a cross-linking reaction starting time TS according to η(t) and δ(t) curves of the reference sample (step A4); and defining an index α according to Tx and Ts.

High-voltage cable insulation material continuous extrusion processing characteristic evaluation and optimization method and apparatus

The present invention provides a polypropylene cable protective layer and a preparation method thereof. The polypropylene cable protective layer sequentially includes a dielectric layer, a buffer layer and an insulating layer from the inside to the outside, and the thickness of the dielectric layer accounts for 5%˜12% of the thickness of the polypropylene cable protective layer; the thickness of the buffer layer accounts for 17%˜25% of the thickness of the polypropylene cable protective layer; the dielectric layer, the buffer layer and the insulating layer are respectively obtained by the wrapping of a polypropylene film A, a polypropylene film B and a polypropylene film C. The polypropylene cable protective layer of the present invention forms a dielectric gradient, and realizes the improvement of the insulation strength and voltage level of the power cable, and the increase of the transmission capability.

Polypropylene cable protective layer and preparation method thereof

Refrigerator

Growing community of inventors

Guangdong, China

Yifan Zhang