Sensor Inputs For Currents And Voltages - ABB RELION Series Technical Manual

1MRS758755 A
3.9
REC615 and RER615
Technical Manual
• Up to 1024 events are stored. The stored events are visible in LHMI, WHMI and
Event viewer tool in PCM600.
• Recorded data
• Fault records (up to 128)
• Maximum demands
• Circuit breaker condition monitoring
• Latched alarm and trip LEDs' statuses
• Trip circuit lockout
• Counter values

Sensor inputs for currents and voltages

This chapter gives short examples on how to define the correct parameters for sensors.
Sensors have corrections factors, measured and verified by the sensor
manufacturer, to increase the measurement accuracy of primary
values. Correction factors are recommended to be set. Two types of
correction factors are available for voltage and rogowski sensors. The
Amplitude correction factor is named Amplitude corr. A(B/C) and
Angle correction factor is named Angle corr A(B/C). These correction
factors can be found on the Sensor's rating plate. If the correction
factors are not available, contact the sensor manufacturer for more
information.
Rogowski sensor setting example
In this example, an 80 A/0.150 V at 50 Hz sensor is used and the application has a 150
A nominal 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
defining another primary value for the sensor, also the nominal voltage has to be
redefined to maintain 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 value valid for both 50 and 60 Hz nominal frequency.
Section 3
Basic functions
77