James Bradley Shields

US Patent:

39759024, Aug 24, 1976

Filed:

Jun 4, 1974

Appl. No.:

5/476182

Inventors:

Jack R. Smith - Pittsburgh PA
Leonard H. Burrows - Gibsonia PA
Richard S. Heiser - Pittsburgh PA
Richard J. Hertz - Butler PA
Joseph A. Pesavento - Pittsburgh PA
John F. Reuther - Pittsburgh PA
James J. Shields - Philadelphia PA
Robert A. Yannone - Aldan PA

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

F02C 910
F02C 902

US Classification:

60 3925

Abstract:

A local maintenance controller permits continued power generation during maintenance or failure of a primary gas turbine control system by manually for maintenance purposes or automatically for failure purposes assuming turbine control to thereby insure continued operation. The local maintenance controller set forth is particularly suitable for use in conjunction with a computer implemented gas turbine control system. Transfer between the local maintenance controller and the primary control system is effected in a bumpless manner so that load swings are absent. However, if the turbine was operating at system reserve at the time of transfer, the local maintenance controller reduces the load to peak value until primary control is resumed. Operation at any other load at the time of transfer is maintained by the controller. Transfer back to primary control is also effected in a bumpless manner.