In this paper,through an engineering project,the author expounded the method and analysis and calculation achievement of the water hammer in superhigh pressure pipes caused by pump stopeping.

In accordance with the requirement of technical parameter of super high pressure bend and cold bend specification, the stress at cold bending on the three-roll bend machine was analyzed.

Along with the power system development such as power transmitted form west china toeast china, power grid interlink project,ultra high voltage transmission, large numbersof EHV transmission line has been commissioned in china.

Longitudinal differential protection of optical fiber,which is of many merits, has beenused more and more widely in EHV transmission line protection.

By means of eigenanalysis,the currents of any phases in EHV power lines,which are un-transposed and loop connected,can be precisely calculated.

Fault locating based on fault voltage sequence components for T -type connection EHV lines;

The frequent problems in operation of the longitudinal protection for EHV lines are presented,and relevant solutions are analyzed based on the RCS-931 longitudinal protection device.

5 MPa),such as standards,connection,storage/transportation and instal- lation of HP-piping-systems,HP-valve,fittings and HP-supports,according to our experiences in design and construction and the BASELL standard.