Substation Relay Protection Security Risk Analysis And Its Improvement Measures

Relay protection (the automatic safety device) is the power system after a fault event of natural or man-made barrier effectively. is to protect the safety and the prevention of electrical equipment, power system blackout restrictions the most basic, most important, most effective techniques. Protection of professional work including the main site protection device inspection, the new device installation, commissioning and completion of inspection as well as abnormal operation of the relay protection and fault handling. This paper summarizes the research work is mainly the work of many years of experience in protect ion, protection work around the danger point of expansion, including the following three aspects of the content.1,the analysis of protect ion principles, composition, function and implementation process of circuit breaker control and risk point of analysis, the important role of the secondary circuit protection, combined with practical work in the field, many of protection malfunction are is because the secondary circuit cited problems, such as the parasitic loop and so on, and propose corrective measures. Detailed analysis of the secondary circuit types and sources of interference may cause malfunction protection possible, a variety of targeted anti-jamming measures2,by analyzing the differential protection CT secondary wiring problems, introduces the role of current transformer and substation equipment within the CT polarity of the relevant provisions of the wrong polarity of the CT line to the differential protection caused byhazards, and make sure to check CT polarity method, that a flow method and the hexagonal diagram method.3,based on the work of a professional nature protection relay danger point can be divided into static and dynamic risk points, and put forward the concept of dangerous points and the risk of pre-control point in the expansion of pre-control method in the technical transformation project application.