Solution of Effectively Avoiding Unit Tripping Caused by ABB UNITROL 6800 Excitation System Fault
ABB UNITROL 6800 has multiple redundancy and multi CPU configurations,with a maxi-mum of three channels.The whole control system is equipped with two sets of constant generator ter-minal automatic voltage control(AVR),two sets of constant field excitation current control,backup con-stant field excitation current control.The design of high redundancy and reasonable switching between each other greatly improve the safety and reliability of unit operation.However,ABB UNITROL 6800 excitation system communication control measurement board(CCM)has a fault with minimal probabili-ty and the highest action authority,which will directly lead to unit tripping once it occurs.An optimization scheme to effectively avoid unit tripping caused by CCM board fault is introduced.
Excitation SystemCommunication Control Measurement(CCM)Minimum Probability FaultUnit Tripping
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