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《Journal of Anhui Electrical Engineering Professional Technique College》 2008-01
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The Problem on Relay DC Powersupply Circuit and Relative Countermeasure

LIU Rong-rong1,BAO You-li1,JI Dong-fang2,DONG Li-jin1(1.Jiangsu Wuxi Power Supply Company,Wuxi 214061,China;2.Guodian Nanjing Automation Company,LTD.,Nanjing 211100,China)  
The voltage which is used in relay is crucial and it will directly effect the stable opertation of relay.If something goes wrong with the power system,the interrelated protection system will immediately initiate the fault procedures to detect the type and rage of the fault and makes a correct estimation.If the voltage used in relay is suddenly lost,it will cause mis-protection because some types of distance protections cannot detect faults according to the established procedures.Moreover,problems most likely happen in the tache of DC control loop which control the bus voltage.As for this,analyzing the problems occurred in this tache and bringing forward the measures become even more important.The two examples listed in this article both talk about the serious consequences aroused by 220kV substation′s losing power in DC of bus voltage control loop,and also bring forward a measure on the bases of analyzing the causes.
【CateGory Index】: TM773
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