This paper discusses the generation of electrical fast transient voltage and demonstates standards and methods of electrical fast transient/burst experiments in IEC61000-4-4.

The port definition of numerical protection,the features of electrical fast transient/burst(EFT)and its influence on numerical protection introduced.

Protective relay works in the serious electromagnetic environment of the substations in which there are electrostatic discharge, electrical fast transient/burst, 1MHz oscillatory waves and surge disturbances.

With the test of pulse interference being used in Yaoqiao Coal Mine, the aquiferous hydraulic relationship between the limestone of Ordovician and 4 limestone of Taiyuan group on both sides of Yuantang fault at the boundary of the mine is found out as well as the scope of the water conduction section and the water insulation section that provide reliable basis for fault prevention and water-proof.

By analyzing time-frequency characteristics of the pulse interference in the frequency monitor system (FMS) of high frequency radar, this paper gives a method to eliminate its effects.

The paper gives a special analysis of the influence caused by pulse interferences as concerned with NGS theory model.

The antijamming performance of OFDM(Orthogonal Frequency Division Multiplexing)with various jamming types was analyzed,such as broadband jamming,pulse jamming,partial-band jamming,multitone jamming and so on,and the performances with coding and interleaving were also given.