ANSI C50.14-1977 pdf download.American National Standard Requirements For Combustion Gas Turbine Driven Cylindrical Rotor Synchronous Generators.
1. Scope
The requirements in this standard apply to 60 Hz open-ventilated air-cooled cylindrical rotor synchronous generators rated 10.000 kVA and above.
All requirements and definitions, except as specifically covered in this standard, shall be in accordance with ANSI C50.10-1977 and C50.13-1977.
2. Classification
A combustion gas turbine driven synchronous generator is classified structurally as a cylindrical rotor synchronous generator, and with regard to cooling as indirectly cooled.
3. Usual Service Conditions
The power output of a combustion gas turbine, for a given combustion temperature, is a function of the density of the inlet air, which, in turn, is a function of temperature and atmospheric pressure. The standard operating condition for combustion gas turbines is 15°C inlet air temperature at sea level.
Combustion gas turbines usually carry several power ratings corresponding to different combustion temperatures. In general, these ratings are related to recommended turbine inspection and maintenance schedules. These various turbine output ratings are frequently grouped into three operating modes, namely, base, peak, and peak reserve. The latter two modes permit increased output with decreased intervals between turbine inspection and maintenance.
accordance with the generator rating and capabilities under the following usual service conditio r carrying load in A generator driven by a combustion gas turbine and conforming to this standard shall be suitable.
4. Output Rating and Capabilities
4.1 Output Rating
The generator continuous output rating shall be expressed in kilovolt-amperes available at the terminals at a specified speed, frequency, voltage, and power factor at an inlet air temperature of 15°C at sea level.
The output rating shall be equal to the generator base capability ( defined in Section 4.2.1) at these conditions.
4.2 Capabilities
Generator capability is defined as the highest acceptable loading (kVA) at a specified condition. Typical generator capability curves are shown in Fig In general, the power output-inlet air temperature characteristics of the generator and the combustion gas turbine do not have the same slope.
4.2.1 Base Capability
The manufacturer shall supply a curve showing generator continuous (8760 hours per year) base capability at rated power factor and sea level. The generator base capability should equal or exceed the base rating of the combustion gas turbine over a specified inlet air temperature range within the limits of Section 3.1.ANSI C50.14-1977 pdf download.