Presents the conceptual design of standard DC potential dividers and its special features and expounds the principle of equal potential screening technique and actions taken for its application in standard DC potential dividers.

The paper introduced the background and basis of compiling DL/T 979—2005"verification rule of DC high voltage megohm box",and its main content,which is new issue of electric power industrial standard.

When applied voltage is raising a high DC voltage divider is heated,and the ambient electric and temperature fields are varied.

Experimental study on operating characteristics for a photovoltaic DC refrigerator was conducted.

A new method for verification of DC resistance box;

The composition,principle,methods of measurement and design of the software for the semi-automatic verification system of DC resistance box are introduced, and the feasibility of the system is testified in this article.

The method to verify DC resistance box automatically using digital multipurpose meter is introduce as well as the software and program,and the error analysis is done.