ASME PTC 20.1

Abstract

OBJECT AND SCOPE <br> The purposes of this Code are: <br> To establish test procedures for determining performance characteristics of speed and load governing systems applicable to the equipment covered under this Code. These performance characteristics include: <br> (1) Adjustable Speed Functions <br> (a) Speed/Load Changer Minimum Speed Holding Level <br> (b) Other Speed Holding Levels <br> (c) Acceleration Control <br> (d) Speed/Load Changer Low Speed Limit <br> (e) Speed/Load Changer High Speed Limit <br> (f) Synchronizing Speed Range <br> (g) Maximum Speed at Rated Power <br> (2) Speed-State Speed Regulation <br> (3) Steady-State Incremental Speed Regulation <br> (4) Dead Band <br> (5) Steady-State Governing Speed Band <br> (6) Steady-State Governing Load Band <br> (7) Response and Settling Time <br> (8) Overspeed <br> (9) Speed/Load Changer Governing System Reference Reducing Time <br> To establish a format and procedures for describing the system performance by means of the test quantities obtained under Par. 1.01. <br> This Code is applicable to the testing of speed and load governing systems for steam turbine-generator units with the steam turbines classified as follows: <br> (a) Straight condensing, straight noncondensing and regenerative turbines without initial and/or exhaust steam pressure control, including reheat turbines. <br> (b) Straight condensing, straight noncondensing and regenerative turbines with initial and/or exhaust steam pressure control, including reheat turbines. <br> (c) Automatic extraction and mixed-pressure turbines, in conjunction with PTC 20.3, Pressure Control Systems Used on Steam Turbine-Generator Units.