Minimac Systems Pvt. Ltd.

A 1200 MW coal-fired thermal power plant using Into-Chinese Turbine EHC System in Southern India. The Plant was struggling with the rapid increase in TAN values in the EH oil of the governing system of the turbine. Also, the moisture content was more than permissible limits. Degradation of the oil was due to contamination ingression into the system resulting in by-product formation. Minimac’s EH oil reconditioning system “ MLC LVDH TRIX 20 ” proved to be the savior and an unexpected shutdown of the turbine worth ₹1.05 Cr per day was saved . PROBLEMS A rapid increase in the Total Acid Number (TAN) could degrade the EH oil and lead to the possibilities of failure of servo valve, hunting, power generation loss, unplanned shutdown, etc. Oil Analysis was done to check the properties of EH oil like Moisture, NAS value, Total Acid Number. SOLUTIONS Installation of Minimac’s EH Oil Reconditioning System “ MLC LVDH TRIX 20 ” is comprehensively designed with 4 major technologies to: Remove solid

A 1200 MW coal-fired thermal power plant using Indo-Chinese Turbine EHC - System in Southern India. SYNOPSIS The power plant was suffering from a loss in electricity generation for a few days as per the desired target. The O&M team identified that the turbine command was not functioning properly and was tripping frequently. On further investigation, it was found that the Servo Valve (Moog Valve) had failed and showed hunting or sluggish behavior. Minimac’s EH Oil Reconditioning System “ MLC LVDH TRIX 20 ” acted as a rescuer and saved the plant from an unexpected shutdown. If this system would have been implemented earlier, a loss of more than ₹5 Cr could have been saved. PROBLEMS Failure of Moog Valve: This was the main reason for the turbine trip and breakdown in the power plant. Poor Oil Analysis Program: Oil analysis should be done monthly for Particle Count & TAN (weekly if the trend is negative). For moisture contamination, weekly test is suggested but the customer faile