The graduation to the design plan， based on the principle of national economic development， policies， technical requirements criteria， combined with the actual construction to ensure reliable power supply， scheduling flexibility to meet the technical In the analysis of raw data based on the 110KV substation electrical design engineering on several comparative analysis of the connection modes of operation， first elected to meet the 110KV substation safe， reliable quality， following the security requirements of economic operation and the best connection mode as normal 110KV substation run main electrical On the development of the main electrical connection， to short-circuit current calculation， to choose a reasonable electrical Finally， a part of the wiring and the configuration of relay protection requirements to ensure safe and economic operation of the substation to prevent the occurrence or expansion， to the purpose of safe and economic Substation automation is the secondary substation equipment (including measuring instruments， signal systems， relay protection， automatic devices and remote devices， ) through a combination of functions and optimize the design， use of advanced computer technology， modern electronic technology， communication technology and signal processing technology， on all major substation equipment and transmission and distribution lines of automatic monitoring， measurement， automatic control and computer protection， and integrated communications and scheduling automation
The graduation design based on the design plan descriptions of the construction of national economy and policy， the policy， technology， combined with the actual engineering prescribed line， ensure reliable power supply， scheduling， meet the technical requirements for On the analysis of the original material， on the basis of 110 kv substations electrical design project of the connection mode of operation are analyzed， 110 kv substations is elected meet safe， reliable quality， and the economic operation of the requirements of 110 kv substations wiring way as the normal operation and auto-switch For the main electrical wiring， short-circuit current calculation， to reasonably select the electrical Finally， according to the first part of the wiring and requirements of the relay protection， substation configuration， in order to ensure the safe and economic operation， prevent accidents or expansion， the safe and economic Integrated substation automation are the second equipment (including substation measuring instruments， signal system， relay protection and remote device and automatic device etc) through the combination of function and the optimization design， the use of advanced computer technology， modern electronic technology， the communication technology and the signal processing technology， the main equipment of the transformer substation， power distribution lines and automatic monitoring and measurement， automatic control and microcomputer protection， and scheduling communication etc comprehensive automation Keywords:Substation， The main electrical wiring， Transformer， Circuit breaker， Isolating switch， Bus， Short-circuit current， Relay protection， Control and
Three-phase short-circuit with is power system planning， design and operation of the calculation and analysis to At present， three-phase current short road condition has become a troubled many domestic electrical key However， in the three-phase short-circuit current calculation， the design， operation and the calculation method of the research department adopts each are not identical， this may cause short-circuit current calculation results and the difference of the judgment of short-circuit current exceeds differences， and short-circuit current If the short-circuit current calculation results rather conservative， may cause unnecessary waste of investment， If you tend to be optimistic， the safe and stable operation of the system of Buried Therefore， in the research of short-circuit current calculation standard based on the different condition of short-circuit current calculation of short-circuit current calculation results for grid， and the influence of short-circuit current calculation and limit to provide more practical methods and 1 short-circuit current calculation methodClassic short-circuit current calculation method for: change than 0， do not consider lines and parallel compensation capacitor recharge， don't consider the impact load and load current node voltages， take the 0， generator The standard of short-circuit current calculation are mainly IEC standard and the ANSI standard， China USES is the IEC Owing to the short-circuit current calculation method and calculation The standard recommends three-phase short-circuit current calculation method is equivalent voltage source， its calculation method for: 1) does not consider the rotating load operation data and generator excitation way， 2 lines and ignore the rotating electrical load of parallel admittance， 3 the transformer has tap-changer and its position as the position in the Lord， Regardless of the arc resistance; (4) 5 35 kV short-circuit current calculation system， the maximum equivalent voltage source， the nominal voltage from 1 (1) in the calculation of the rated voltage of the contributions of pu)， but shall not exceed the maximum operating voltage For power grid planning and operation department， three-phase short-circuit with the biggest is main content of The grid computing， and electricity network in different departments may use different calculation Differences are mainly concentrated in transformer， node voltage Transformer has taken 0， have taken more than the actual operation change， Node voltage may take 0， also may take These two different combinations are adopted， obviously， this will affect short-circuit current calculation The root of the problem is calculated according to calculation program to staff the natural Settings to calculate and calculation program and lack of Actually， if you know a short circuit calculation and the requirement of personnel is calculated from the calculation results can be Some commercial software also provides flexible short-circuit current calculation conditions setting enterprise2 influence factors of short-circuit current calculation resultsAmerican PTI company PSS/E program provides short-circuit current calculation based on the trend of the classical method， and the ANSI standard or IEC standard of short-circuit current IEC standard， allows users to set arbitrary short-circuit current calculation of the initial Set of options include: (1) change than choice: 0 or normal variable ratio， 2 consider whether charging capacitance， 3 and parallel compensation or not， 4 node voltage， 5 generator power Therefore， using PSS/E procedures for its own example with different initial conditions of short-circuit current calculation results of analysis
