Research On Busbar Differential Protection Technology

Busbar is an important part of power plant and substation.Busbar is also called busbar Busbar.It is an important equipment to collect electric energy and distribute electrical energy.The generator,transformer,transmission and distribution line and phase modulation equipment are connected to the bus and substation.If the bus fault is not quickly removed,it will cause further expansion of the accident,which may affect the stability of the power grid,resulting in power system disconnection accident.The ultimate goal of this paper is to be able to effectively improve the level of bus protection,in order to achieve this goal first for the bus protection concept and the current status of bus protection must have a profound understanding.Only after a scientific understanding of this can be achieved in-depth analysis;bus differential protection as a very common form of protection,in the specific operation of the impact is very large,the new situation in order to be able to achieve scientific protection also It is necessary to strengthen the study of bus differential protection.In this paper,the study of bus protection is the first from the basic concept of starting to analyze the principle of bus protection,type,basic requirements and protection of technical problems;followed by bus differential protection to start the bus differential protection how to connect and test.Busbar differential protection is an important form of bus protection,in the specific protection process,its impact is very large.It is therefore necessary to understand this concept in the analysis of the status of bus protection.Finally,this article is to use cases to carry out targeted analysis.Bus protection has its own principles and requirements.Busbar protection itself can be divided into two types: busbar protection based on transient quantity and bus protection based on power frequency.At the same time should also see the bus protection is also its requirements,in order to achieve scientific protection requirements with speed,selectivity,reliability,sensitivity.Bus differential protection wiring has its clear requirements: in accordance with the provisions of the current transformer in a secondary side should be in accordance with the same polarity one by one correspondence.When the current mutual inductance of the primary side L1 is the outside when the current transformer secondary measurement with the same polarity of the N1 is also the outside;for the bus connected to the components of the current transformer should form a "Y" type,the current mutual inductance Changes in the device should also be consistent;wiring process to pay attention to bus differential protection on the busbar current transformer secondary polarity requirements[1].In this paper,a 220 k V substation 220 k V bus as an example,the use of comparative analysis of a detailed analysis before and after the transformation of a wiring,bus differential circuit composition,into the circuit composition,failure circuit composition.Through the comparison and analysis can be found after the transformation of dual mother poor double failure will be able to achieve bus differential protection of the dual configuration,bus differential protection reliability will be able to further enhance[2].Taking 220 k V bus as an example,this paper makes a detailed analysis of the primary wiring,the busbar differential circuit,the open loop structure and the failure circuit composition before and after the transformation by using the comparative analysis method.By comparing and analyzing the accuracy of the bus differential protection before and after the transformation,the rationality of the transformation is further verified.The main contents of this paper are as follows: Introduction,bus protection trend of bus protection technology,bus protection basic requirements,bus protection type and principle,typical bus differential protection wiring analysis,bus differential protection wiring inspection,accident handling case analysis and other parts The.