Generators produce electrical energy from
mechanical power transmitted from the turbine.
Large motors drive pumps to move water. Generators
and large motors included in this section are
synchronous machines performing the primary
function of the power or pumping plant.
Check commutation or
collector
ring
and
brush
operation.
Reference:
PEB 55 Appendix 19
Check bearing temperatures,
lubrication, and oil level.
Check water leaks in bearing
and cooling coils and surface air coolers.
Check cooling water flow.
Reference:
PEB 55 Appendix 19
Perform generator
thrust-bearing insulation and oil
film resistance test.
Reference:
FIST 3-11
FIST 4-1A Section 2.11.1-8 PEB
55 Appendix 19
Thoroughly inspect stress
carrying parts of rotor for cracks.
Check bolted connections for
tightness and any evidence of
movement.
Check stator frame for loose
connections, cracks, or other damage.
Check stator air gap at a
minimum of four positions, top, and
bottom.
Reference:
FIST 4-1A Section 2.11.10
Perform Partial discharge test.
Reference:
PEB 29
Conduct
insulation
resistance and dielectric absorption test
(PI) to identify factors in assessing
serviceability of generator or large motor
armature and/or field winding insulation..
Reference:
PEB 29 Page 24
PEB 55 Appendix 19
FIST 3-1 Sections 15 -19
Perform an Armature Winding
DC Ramp Test.
Reference:
FIST 3-1 Section 39
PEB 29
PEB 55 Appendix 19
Perform Pole Drop Test.
Reference:
PEB 29.
Motors of this type drive pumps, valves,
gates, and fans. They are usually induction motors
and are generally less than 500 hp but may be
somewhat larger. Critical motors should be tested
routinely. The maintenance schedule for motors
(< 500 hp) only pertains to those associated with
critical equipment as defined in section 1.3.2 of this
document..
[
Insulation Resistance Test
Reference:
FIST 3-4 Section 2.2
PEB 55 Appendix 21
Reference:
U.S. Department of the Interior
January 2019 Bureau of Reclamation,
“Facilities Instructions, Standards, and
Techniques Volume 4-1B:
Maintenance Scheduling for Electrical
Equipment”, January 2019