Research On Control And Protection And Installment Construction Technique Of Fault Current Limiter In 500kV Pingyao Substation

This article briefly describes the fault current limiter: As a new technical measures, fault current limiter in power system normal operation, the equivalent zero-frequency impedance, does not change the trend of normal distribution, system failure in the power failure current limiter action will limit the reactor at the appropriate time, the rapid investment, thus limiting the fault current. Then introduced the fault current limiter demonstration project in East China 500kV power grid:to limit the Zhejiang region's growing short-circuit current level, through a comprehensive calculation and analysis of the 2010 East China Power Grid 500kV substation short circuit current level, combined with economic analysis and supporting technology key technologies, the final decision to install the 500kV substation fault current limiter in Pingyao. In Pingyao - Hangzhou North single circuit line to install a 8.0 ohm, rated current 2.0 one thousand amperes of fault current limiter, the installation location in Pingyao substation. The fault current limiter can greatly reduce the branch short-circuit current, and can short circuit the total current reduced to 47kA or less.This paper describes the main fault current limiter circuit and a part of the main equipment and its functions. Primary equipment includes the following components:current limiting reactors, capacitors, thyristor valves, controllable spark gap, mechanical bypass switch, MOV, damping circuit, the bypass isolator and isolation switch. In this paper, fault current limiter device input and exit procedures were clearly explained. In this paper, the damping circuit of the four options, and explain the advantages and disadvantages of each are compared. This paper describes the control of the fault current limiter protection system structure, especially the more detailed description of the platform measurement system and human machine interface systems. Limiting reactor fast access and over-voltage control and protection strategy of limiting fault current limiter performance is critical, the paper demonstrates the fault current limiter limiting investment criteria fast reactor and related issues, fault current limiter to be adopted and 24 were introduced one by one protection.This article also working practice of the fault current limiter in the construction and installation, operation and maintenance of key and difficult problems in the process conducted in-depth detailed discussion and elaboration. Drafting of the fault current limiter installation and construction specific process flow, and it includes 5 major processes. And the 500kV power grid fault current limiter Pingyao installation and construction project as an example to illustrate how the process of installation and construction lifting platform, the platform assembly of some of the specific difficulties encountered problems. Finally, instructions and equipment manufacturers also work with actual fault current limiter is proposed abnormal situation occurs when the device how to check processing guidance.