Method and apparatus for changing the phase sequence of a completed generator
First Claim
1. An electrical power generator having a housing enclosing a stator with plural, series connected coil sides arranged in corresponding, plural phase bands with respectively associated terminating coil sides and phase terminals, at least a first set of connectors secured in fixed positions relatively to the housing and disposed in spaced, common-planar and parallel-axial relationship and connected to predetermined, respective phase terminals, the plural phases of the generator output voltages being produced at the respective connectors of the first set in accordance with a predetermined phase sequence, a lead box of side and bottom enclosing walls and a top wall which is substantially open, secured to the housing and communicating through the open top wall with the first set of connectors, and a second set of plural connectors secured in fixed positions relatively to the bottom wall of the lead box and in spaced, common-planar and parallel-axial relationship, the plural connectors of the second set being generally aligned with respective, plural connectors of the first set, comprising:
- a pair of crossed main leads respectively interconnecting adjacent pairs of the generally aligned, respective connectors of the first and second sets thereof in diagonally-related relationship and a third main lead interconnecting the remaining, generally aligned pair of connectors of the first and second sets, the crossed main leads in conjunction with the third main lead supplying the generator output voltage phases to the second set of connectors in reverse phase sequence relatively to the predetermined phase sequence of the generator voltage output phases as produced at the first set of connectors; and
the crossed main leads each having opposite end portions aligned with the respective, diagonally-related connector of the first and second sets and a central portion extending between and interconnecting the end portions, the respective central portions encompassing intermediate, mutual crossing portions defining acute included angles therebetween laterally oriented relatively to the generally aligned axial relationship of the connectors of the first and second sets and the respective, mutual crossing portions being displaced from each other by at least a minimum, predetermined distance throughout the respective extents thereof so as to satisfy voltage strike requirements for the requisite test and operating voltage levels of the corresponding voltage phase outputs of the generator.
3 Assignments
0 Petitions
Accused Products
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. Insulating support plates maintain the required minimum distance between the mutual crossing portions and special, directional ventilating ducts compensate for increased eddy current heating of localized areas of the lead box.
32 Citations
12 Claims
-
1. An electrical power generator having a housing enclosing a stator with plural, series connected coil sides arranged in corresponding, plural phase bands with respectively associated terminating coil sides and phase terminals, at least a first set of connectors secured in fixed positions relatively to the housing and disposed in spaced, common-planar and parallel-axial relationship and connected to predetermined, respective phase terminals, the plural phases of the generator output voltages being produced at the respective connectors of the first set in accordance with a predetermined phase sequence, a lead box of side and bottom enclosing walls and a top wall which is substantially open, secured to the housing and communicating through the open top wall with the first set of connectors, and a second set of plural connectors secured in fixed positions relatively to the bottom wall of the lead box and in spaced, common-planar and parallel-axial relationship, the plural connectors of the second set being generally aligned with respective, plural connectors of the first set, comprising:
-
a pair of crossed main leads respectively interconnecting adjacent pairs of the generally aligned, respective connectors of the first and second sets thereof in diagonally-related relationship and a third main lead interconnecting the remaining, generally aligned pair of connectors of the first and second sets, the crossed main leads in conjunction with the third main lead supplying the generator output voltage phases to the second set of connectors in reverse phase sequence relatively to the predetermined phase sequence of the generator voltage output phases as produced at the first set of connectors; and the crossed main leads each having opposite end portions aligned with the respective, diagonally-related connector of the first and second sets and a central portion extending between and interconnecting the end portions, the respective central portions encompassing intermediate, mutual crossing portions defining acute included angles therebetween laterally oriented relatively to the generally aligned axial relationship of the connectors of the first and second sets and the respective, mutual crossing portions being displaced from each other by at least a minimum, predetermined distance throughout the respective extents thereof so as to satisfy voltage strike requirements for the requisite test and operating voltage levels of the corresponding voltage phase outputs of the generator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
Specification