電氣專業(yè)畢業(yè)設(shè)計英文文獻(xiàn)(編輯修改稿)

　

【文章內(nèi)容簡介】 at present and it is various kinds of function demand where puter protect future. (2)The size and structure are similar to present puter protector , the craft is superior, takes precautions against earthquakes , defends overheatedly and defending the electromagic ability of interfering strongly, can operate it in very abominable working environment , the cost is acceptable. (3)Adopting std bus or pc bus, hardware module , can select different module for use to different protection wantonly , it is flexible , easy to expand to dispose. It is an irreversible development trend to continue the puter , puterization of the electric protector. But to how better meet power system demand, how about raise the dependability of relay protection further, how make heavy economic benefits and social benefit, need carry on concrete deep research. 2） Networked Computer work bee the technological pillar of information age as message and data munication tool, made the mankind producing , basic change has taken place in the appearance with social life. It is influencing each industrial field deeply, has offered the powerful munication means for each industrial field too. Up till now, except that protect differentially and unite protecting vertically, all continue electric protector can only react that protect the electric quantity of installing office. The function of relay protection is only limited to excising the trouble ponent too , narrow the accident coverage. This mainly lack the powerful data munication means. Having already put forward the concept protected systematically abroad, this meant the safe automatics mainly at that time. Because the function of relay protection is not only limited to excising the trouble ponent and restriction accident coverage (this is primary task), the peace and steadiness that will be guaranteed the whole system run . This require each protect unit can share the whole operation and data , trouble of information of system, each protect unit and coincident floodgate device coordination on the basis of analysing the information and data, guarantee systematic peace and steadiness run . Obviously , realize the primary condition that system protect the whole system every protector of capital equipment link with the puter work, namely the one that realized the puter protector is worked. This is totally possible under present technological condition . To general protecting systematically , realize the puter working of the protector has a very great advantage too. It continue electric trouble not the less many in information not systematic can receiving protector ,for trouble nature , judgement and the trouble, trouble of position from measuring the less accurate. Protect to selfadaptation research of principle pass long time very already , make certain achievement too, but should really realize protecting the selfadaptation to the operation way of the system and trouble state, must obtain more system operating and trouble information , the puter that only realizes protecting is worked, could acplish this . As to the thing that some protectors realize puter working , can improve the dependability protected . Tianjin Sanxia vltrahigh voltage many return circuit bus bar , 500kv of power station , put forward one distributed principle that bus bar protected to future 1993 such as university, succeed in developing this kind of device tentatively. Principle its bus bar is it disperse several (with protect into bus bar back to way the same ) bus bar protect Entrance to protect traditional concentration type, disperse and install it in every return circuit is protected and rejected , each protect the unit to link with the puter work, each one protects the electric current amount that the unit only inputs a return circuit , after changing it into figure amount, convey to the protection units of other return circuits through the puter work, each protect the unit according to the electric current amount of this return circuit and electric current amount of other return circuits got from puter work, carry on bus bar differential calculation that protect, if result of calculation prove bus bar trouble jump format return circuit circuit breaker only, isolate the bus bar of the trouble. At the time of the trouble outside the bus bar district , each protect the unit and calculate for movements of the external trouble. This kind protect principle by distributed bus bar that work realize with puter, bus bar protect principle have higher dependability than traditional concentration type. Because if one protect unit interfere or mistake in putation and when working up by mistake, can only jump format