This paper analyzes the condition of switching surge test for transformer and presents that it is helpful to improve the accuracy of the test result by exciting transformer with DC supply instead of the traditional switching impulse.

The systemic switching impulse discharge tests of rod-plane air gaps with 0.

In accordance with the project of UHV AC transmission and substation to be constructed,this paper researches the switching impulse discharge characteristic curve of 1 000 kV AC substation equipment air gap,based on the 1 000 kV AC power transmission & transformation project from the southeast in Shanxi province to Jingmen of Hubei province.

At high altitude the switching impulse discharge performance of an air-gap is one of design foundations for the external insulation of the extra & ultra-high voltage,also is one of essential technique that did not solved yet.

This paper introduced the new IEC60076 -4 test guidance of lightning surge and switching surge for power transformer and reactor, which is the new edition of IEC722 (1982).

FEA on the impact test of aluminium alloy wheel;

Dynamic analysis on impact test of high toughness Al-alloy LD2;

Tensile test,impact test have been carried out for the three alloys.

Basic principle and content in standard ASTM E23-02 "Standard Test Methods for Notched Bar Impact testing of Metallic Materials" and ASTM A370-03a "Standard Test Methods and Definitions for Mechanical Testing of Steel Products" were described in this paper.

Basic conceptions of dynamical breakage and methods of impact testing of rock are introduced,different pills and impact pressure are studied,stress and strain in impact testing are measured,and some benefit conclusions are gived.