Page 256 - Water Standards
P. 256
Table 4 2 8-6 Allowable absolute throw of the hydraulic
turbine guide bearing
Shaft rotational speed (r/ min) n≤250 250<n<600 n≥600
Allowable absolute throw (mm) 0 35 0 25 0 20
Table 4 2 8-7 Allowable insulation resistance of each
part of a suspended generator unit s thrust bearing
Equipment for
Insulation measuring
Thrust bearing
No resistance insulation Explanation
component
(MΩ) resistance
(V)
Thrust bearing seat Measure after the installation
1 5 500
and supports of the seats and supports
Measure when the bearing has
been totally assembled and the
rotor has been installed
2 Thrust bearing 1 500
Measure before the filling of
lubricant oil and the temperature
shall be between10℃ and 30℃
Before filling with lubricant
Embedded oil, measure the insulation re⁃
3 50 250
thermometer sistance of the thrust pad from
each thermometer s core wire
4) During installation, the bearing liner gap shall be adjusted according to the main
shaft s center position and direction and size of the barring gear s throw. The total
installation gap shall meet the design requirements.
5) The allowable error of the segmented guide bearing liner gap shall be no larger
2 4 9