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Application Overload protection for the stators of large generators. B. Features delay inversely proportional to overload (see Fig. 3.5.16.1) operating characteristic according to ASA-C50.13 (American Standard Requirements for Cylindrical-rotor Synchronous Generators) with extended setting range adjustable rate of counting backwards when the overload disappears (cooling rate of thermal image) insensitive to DC components insensitive to harmonics single or three-phase measurement detection of highest phase in the three-phase mode.Explanation of parameters: RunOnCPU defines the processing unit which runs the function. ParSet 4..1 Parameter for determining in which set of parameters a particular function is active (see Section 5.11.). Trip 01-08 defines the tripping channel activated by the tripping O/P of the function (matrix tripping logic). Trip 09-16 corresponds to Trip 01-08 (providing tripping unit fitted).CurrentInp defines the current input channel. All current I/P's may be selected. In the case of three-phase measurement, the first channel of the group of three selected must be specified.
The stator overload function protects stator windings against excessive temperature rise as a result of overcurrents. The function is applicable to turbogenerators designed according to the American standard ASA-C50.13 or a similar standard defining overload capability. Providing compensation using the reference value of the A/D channel has not been made, the reference current IB for the protection is calculated from the generator load current IB1, which is usually the same as the generator rated current, and the c.t. rated currents IN1 and IN2 as follows:The setting is the ratio IB/IN, IN being the rated current of the protection, otherwise "IB-Setting" would be 1.0 IN. The multiplier k1 is 41.4 s for units designed according to ASA.Overload (OLoad-Rotor) A. Application Overload protection for the rotors of large generators. B. Features delay inversely proportional to overload (see Fig. 3.5.17.1) operating characteristic according to ASA-C50.13 (American Standard Requirements for Cylindrical-rotor Synchronous Generators) with extended setting range adjustable rate of counting backwards when the overload disappears (cooling rate of thermal image) three-phase measurement current measurement three-phases of AC excitation supply evaluation of the sum of the three phases (instantaneous values without digital filtering).