Our site has a Gas Turbine simple cycle GE Frame 6B MKV control system. During Turbine loaded at Base load every thing normal and IGV at 84 DEG. Turbine Trip Suddenly by IGV Control Trouble L4IGVT. investigate the signal result to trip. I get LK4IGVTX logic 1 when 14HS logic 1 result to trip Turbine. when check physically IGV after trip, we get the IGV not back to 34 DEG after turbine trip. IGV still fully open at 84 DEG without hydraulic oil pressure, and alarm L3IGVFLT, and Turbine not ready to Start. we turn IGV back by manual to 34DEG and release alarm by master rest. when start again and load to base load, IGV open normal till 84DEG. after one day happened again trip same last story. i was check LVDT and Servo, all feedback CSVG. CSRGV correct.
Appreciate if any guide for solution this problem.
Appreciate if any guide for solution this problem.