The value of k=0.92 is recommended in generator applications as the trip delay isnormally quite long.The calibration factors for current and voltage measurement errors are set % ofrated current/voltage:IAmpComp5, IAmpComp30, IAmpComp100UAmpComp5, UAmpComp30, UAmpComp100IAngComp5, IAngComp30, IAngComp100The angle compensation is given as difference between current and voltage angleerrors.The values are given for operating points 5, 30 and 100% of rated current/voltage.The values should be available from instrument transformer test protocols.9.12 Directional overpower protection GOPPDOP SEMOD172360-1 v49.12.1 IdentificationSEMOD176574-2 v4Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberDirectional overpower protection GOPPDOPP >2DOCUMENT172362-IMG158942V2 EN-US329.12.2 Application SEMOD172358-4 v2The task of a generator in a power plant is to convert mechanical energy availableas a torque on a rotating shaft to electric energy.Sometimes, the mechanical power from a prime mover may decrease so much thatit does not cover bearing losses and ventilation losses. Then, the synchronousgenerator becomes a synchronous motor and starts to take electric power from therest of the power system. This operating state, where individual synchronousmachines operate as motors, implies no risk for the machine itself. If the generatorunder consideration is very large and if it consumes lots of electric power, it maybe desirable to disconnect it to ease the task for the rest of the power system.Often, the motoring condition may imply that the turbine is in a very dangerousstate. The task of the reverse power protection is to protect the turbine and not toprotect the generator itself.Section 9 1MRK 506 369-UEN BCurrent protection520 Line distance protection REL670 2.2 IECApplication manual
