This sound started suddenly after about four months normal operation of the generator and there did not happened any event, especially on turbine side. Turbine is made of a well known international electrical company. Steam turbine is a part of combined cycle power plant.
The motor is closed type, air cooled. PT100 type RTDs are used for temperature sensing and connected with DCS system through transducer for recording. There is not any temperature reading error problem, because same RTD are installed on other motors and they give correct results. Also, the...
Steam Turbine Generator has the following specifications:
OUTPUT 88,500 kVA
VOLTAGE 11,000 V
CURRENT 4645 A
Ex. VOLTAGE 320 V
Ex. CURRENT 820 A
INSULATION CLASS F
STANDARD IEC 60034-3 (2005)
RATING CONT.
PHASES 3
POWER FACTOR 0.8
FREQUENCY 50 Hz
SPEED 3,000 rpm
MOMENT OF INERTIA(GD2) (10.0...
The motors are installed new about 4 months ago. Bearing grease has still not been changed. As per nameplate, Motor Type VSTC, FLA 60A, Pole 8, RPM 735, DE Bearing NU224M, Max. ambient 45C, Service factor 1.
Manufacture O&M Manual recommends :
"Embedded Temperature Detector for Winding at B...
Three induction motors with rating 6kV, 500kW, 60A, Class F. Each coupled with a Centrifugal Pump of Hydraulic Power 470kW. Motors are running at ambient temperature of 45 deg C. Each motor winding temperature reaches at 145 deg C but the current is 55A. Motor drive-end bearing temperature is 90...
I am an electrical engineer in a combined cycle power plant. I am nowadays involved in the undervoltage settings calculations of MV and LV Buses Changeover breakers.
The existing undervoltage settings of the LV and MV incoming breakers and the Changeover (Bus Coupler) breakers are as follows:
MV...
