| 主权项 |
1. A retrofit method for modifying a radial lead seal assembly of a generator, wherein the generator comprises a lead assembly for conducting a field current to a rotor winding, wherein the lead assembly comprises an axial lead extending within an axial chamber through the rotor and a radial lead extending radially outward from the axial lead through a radial chamber, wherein the radial lead seal assembly fluidically seals the radial chamber from the axial chamber, wherein the radial lead seal assembly comprises a plurality of annular sealing elements disposed around the radial lead so as to seal an annular space between the radial lead and the radial chamber, a coil spring disposed annularly around the radial lead between the plurality of sealing elements and a junction between the radial lead and the axial lead, and a loading member, the retrofit method comprising:
removing one or more of the annular sealing elements to define a radial space between the remainder of the sealing elements and the coil spring; inserting a plurality of conical springs in said radial space; and applying a radially inward compressive load on the radial lead seal assembly via the loading member such that the conical springs are only partially compressed, wherein a clearance from an outer diameter of the conical springs to an inner diameter of the radial chamber is smaller than a clearance from an inner diameter of the conical springs to an outer diameter of an insulation of the radial lead so that the conical springs do not contact with an insulated surface of the radial lead. |
