Virtual reality modeling language (VRML) is a primary file format used in power visualization systems for transmitting 3D models. In the context of transmission line inspection and maintenance

existing VRML files often exhibit large data volumes and complex structures

resulting in low compression rates and limited transmission efficiency. To address these challenges

a binary compression encoding method for VRML files is proposed in this paper. By employing structural hierarchy parsing

attribute difference marking

and a local consistency compression strategy

the proposed method effectively eliminates redundant node structures and point attribute data. Experimental results show that

under optimal compression conditions

the method achieves a compression ratio of up to 26∶1 on typical inspection models

significantly outperforming traditional general-purpose compression tools

while preserving the visualization quality and structural integrity. These results confirm the method's practicality and strong potential for engineering deployment.