Valve opening and closing too quickly will cause near instantaneous fluid pressure fluctuations (water hammer), the peak is usually able to reach pipes more than six times the normal pressure, but also because the system water hammer wave reflection serious concussion;
2013年11月7日星期四
Full metal pole loops; complete monopolar ground return line running
With the growth of the national economy , energy and the distribution of the load center features make the ultra- long-range , large -capacity power transmission become inevitable , the use of ± 800kV HVDC transmission technology, not only conducive to
Valve manifolds transmission of scale , saving a lot of resources, transmission corridor You can also increase the level of security and stability of the grid . HVDC (UHVDC) project generally use two 12-pulse valve means connected in series to form a pole, this structure makes the entire DC system has great flexibility , based HVDC (UHVDC) of a pole 2 the characteristics of a valve in series , the DC system operation modes: full bipolar operation ; complete monopole metal loops ;
Stainless steel needle valve ground return line run ; 3/ 4 bipolar ( a very full 1/ 2 is extremely uneven ) run ; 1/ 2 bipolar operation ; 1/ 2 pole metal loop run ; 1/ 2 monopolar ground loop operation. For the above characteristics, HVDC project must meet the following requirements: ① tandem two manifolds can be run
Stainless steel needle valve ; ② stable operation of the two valves in series should be essential to maintain symmetry operation ; ③ When either a valve operation, through relevant the control inputs of two manifolds, AC / DC system should not produce too much disturbance ;
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