Engineering Research And Application Of 220kv Bzt Device

Backup power switchover unit devices are widely used in the 220kV power grid systems, we necessary to understanding the devices design in-depthly. With the improved performance of substation automation, but also greatly enhance the complexity of the secondary circuit, and on-site operation and maintenance of the difficulties, technical support and on-site security problems. And practice also shows that the device considering the design principles can not meet the requirements with operation and management issues and other factors. In the main supply system failure, the correct action can not be prepared, which caused power grid situation accidents.Mainly through the analyse of Da lang and Yue Li Transformer substation's backup power switchover unit, We discover some problems backup power switchover unit's impact of the entire substation combined with on-site design and implementation, and related issues from proposed solutions and technical support. The paper analyse the unit of Analysis of various design, and Related to the design concept proposed, In order to achieve the correct, reliable operation.Depending on a variety of substation operation mode requires specific analysis of backup power switchover unit's strategy. Discuss issues of program logic and analysis of unit, Study of the various operating modes, Design principles and so can not meet the requirements of the scene, as well as factors such as management of field operation, Exist in the main supply power system failure, The correct action can not be the case of an accident caused power to carry out detailed analysis and discussion, and constantly upgrade the program logic.And external circuit protection device with the problems of co-ordination and analysis of circuit complexity due to the improvement of protection with effects loop and protection outside the program's co-ordinated into a more subtle and critical link, remove the external cover issues.When 110kV part of the power supply with external power in Substation Operation Mode, The voltage on the possible backlash to the 220kV Bus. Voltage can not be reduced to make the start value, resulting in analysis of such unit can not start.For Da lang and Yue Li substation, we proposed solutions in the design, construction, operation problems in practical, and operation and maintenance of a detailed analysis, the relevant considerations.