Abstract: An intercoupled stator core is separated from a non-vertically oriented (including horizontal) generator frame by decoupling the stator core and frame coupling members and interposing a slidable member between them. Thereafter they are separated relative to each other on the sliding member. The sliding or slidable member may comprise a rail, or alternatively a roller adapted for rolling contact with one of the opposed stator core or generator structures and an engagement surface in contact with the other structure. A system for separating the stator core from a non-vertically oriented generator frame includes first and second raising end plates adapted coupled to axial ends of the stator core. The end plates project outwardly from the generator frame ends, for coupling to a raise mechanism. After the raise mechanism raises the stator core the slidable member is interposed between the stator core and generator frame.

Abstract: A method of removing a stator coil (10) from a stator core (12) of an electrical generator, including vibrating an unbonded portion (50) of the coil (10) until a resin bond material (32) between a bonded portion of the coil (46) and a surface (34) of the core (12) fails due to high cycle fatigue to free the coil (10) from the core (12).

Abstract: A system and method for monitoring the condition of a vibration sensor in a system. Vibrations are received in the system at one or more vibration sensors. Sensor data is output by the vibration sensor(s). The sensor data includes data representative of the vibrations in the system and data representative of a natural frequency of the corresponding vibration sensor. The sensor data output from the vibration sensor(s) is monitored, and upon a change in the data representative of the natural frequency of a vibration sensor, that vibration sensor is flagged.

Abstract: A method of removing a stator coil (10) from a stator core (12) of an electrical generator, including vibrating an unbonded portion (50) of the coil (10) until a resin bond material (32) between a bonded portion of the coil (46) and a surface (34) of the core (12) fails due to high cycle fatigue to free the coil (10) from the core (12).

Abstract: A system and method for monitoring the condition of a vibration sensor in a system. Vibrations are received in the system at one or more vibration sensors. Sensor data is output by the vibration sensor(s). The sensor data includes data representative of the vibrations in the system and data representative of a natural frequency of the corresponding vibration sensor. The sensor data output from the vibration sensor(s) is monitored, and upon a change in the data representative of the natural frequency of a vibration sensor, that vibration sensor is flagged.

Abstract: A method for measuring a tangential tightness of a stator coil within an armature slot of a stator assembly in an electric generator. The stator coil is excited to produce a vibratory response therein. The vibratory response of the stator coil is detected and a frequency response function of the vibratory response is determined. A tangential tightness of the stator coil within the armature slot is estimated based on the frequency response function of the vibratory response of the stator coil.

Abstract: A method for measuring a tangential tightness of a stator coil within an armature slot of a stator assembly in an electric generator. The stator coil is excited to produce a vibratory response therein. The vibratory response of the stator coil is detected and a frequency response function of the vibratory response is determined. A tangential tightness of the stator coil within the armature slot is estimated based on the frequency response function of the vibratory response of the stator coil.

Abstract: Method and apparatus for measuring the tightness of generator stator slot wedges and ripple springs with the rotor still in place. A wedge block having a hydraulic cylinder disposed therein is installed within the upper of a pair of parallel grooves in the stator slot. The hydraulic cylinder is activated to press down on a load plate, which in turn contacts a slot wedge within the other pair of parallel grooves. This is turn compresses the ripple spring between the slot wedge and the stator windings. A load cell measures the force required to compress the ripple spring, while four linear variable differential transformers measure the amount of displacement of the slot wedge. These two measurements are then used to derive a measurement for the tightness of the slot wedge and the ripple spring.

Abstract: A standard, predetermined phase sequence of the three-phase voltage output of an electrical power generator, as produced through conventional main leads in the generator lead box which interconnect three (3) generally, axially aligned pairs of connectors of first and second sets, is selectively reversible by the utilization of crossed main leads between two adjacent pairs of the connectors of the first and second sets. Each of the crossed main leads includes opposite end portions aligned with the diagonally-related and interconnected pair of connectors of the first and second sets, the end portions having corresponding bends therein for smoothly contouring and integrally joining the central portions thereof, and the central portions have complementary outward bends in at least the mutual crossing portions thereof to maintain a predetermined, minimum distance therebetween so as to satisfy voltage strike requirements.

Abstract: A resilient stator coil support bracket is provided particularly useful for large hydrogen innercooled turbine generators to give the end winding support assembly greater axial flexibility without substantially increasing the radial flexibility of the assembly. The support bracket includes an element secured to the core as well as an element secured to the brace that is radially outside each coil end turn with a sheet of resilient material therebetween, or there are two elements of the brace secured to the core with an intermediate element secured to the brace and the mating surfaces of all adjacent elements are spaced by sheets of resilient material, such as of an elastomer, that flexes in shear and compression modes. The bracket is tunable in the sense that the selection of the thickness and composition of the resilient material permits adjusting the natural frequency of the assembly to avoid resonance with the excitation frequency which such gas-cooled generators are sometimes susceptible.