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

US12392701B1 · kind B1 · utility

Assignee

• ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID · CN

Inventors

• Shuai Hou · Beijing, CN
• Mingli FU · Longbeilingcun, CN
• Lei Jia · Beijing, CN
• Yunpeng ZHAN · Longbeilingcun, CN
• Wenbo ZHU · Longbeilingcun, CN
• Baojun HUI · Longbeilingcun, CN
• Xiaolin Li · San Diego, US
• Lingmeng Fan · 流花街道, CN
• Yifan Zhang · Woodbury, US
• Bin Feng · Beijing, CN

Key dates

• Filing date: Dec 6, 2022
• Grant date: Aug 19, 2025
• Expiry date: Dec 6, 2042

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2203/0246
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

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 ηa(t) (step A1); obtaining an outlet expansion rate δ (step A2); recording and displaying curves ηa(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 ηa(t) and δ(t) curves of the reference sample (step A4); and defining an index α according to Tx and Ts.