3.10 Sensor inputs for currents and voltagesThis chapter gives short examples on how to define the correct parameters for sensors.Sensors have corrections factors, measured and verified by the sensormanufacturer, to increase the measurement accuracy of primary values.Correction factors are recommended to be set. Two types of correctionfactors are available for voltage and rogowski sensors. The Amplitudecorrection factor is named Amplitude corr. A(B/C) and Angle correctionfactor is named Angle corr A(B/C). These correction factors can be foundon the Sensor's rating plate. If the correction factors are not available,contact the sensor manufacturer for more information.Rogowski sensor setting exampleIn this example, an 80 A/0.150 V at 50 Hz sensor is used and the application has a 150 Anominal current (In). As the Rogowski sensor is linear and does not saturate, the 80 A/0.150 V at 50 Hz sensor also works as a 150 A/0.28125 V at 50 Hz sensor. When defininganother primary value for the sensor, also the nominal voltage has to be redefined tomaintain the same transformation ratio. However, the setting in the protection relay(Rated Secondary Value) is not in V but in mV/Hz, which makes the same setting valuevalid for both 50 and 60 Hz nominal frequency.RSVII Kfnpr rn=×GUID-6A480073-5C35-4319-8B38-402608D4C098 V2 EN (Equation 1)RSVRated Secondary Value in mV/HzIn Application nominal currentIpr Sensor-rated primary currentfn Network nominal frequencyKr Sensor-rated voltage at the rated current in mVIn this example, the value is as calculated using the equation.15080 15050 5 625AA mVHzmVHz×= .GUID-13DE42A0-29C0-4FE0-B00B-1215B37E3B7B V2 EN (Equation 2)Section 3 1MAC059074-MB ABasic functions104 615 series ANSITechnical Manual
