ABB RELION REX640 Technical Manual page 194

Section 3
Basic functions
188
If an application function requires only the frequency value, output
U3P of UTVTR still needs to be connected since the frequency is
calculated from the voltage.
The voltage transducer selection can be made by setting Voltage input type to
"Voltage trafo" for conventional VT sensor or to "Voltage sensor" for voltage sensor
type.
The sensor's or the VTs' primary rated voltage can be set using Primary voltage
setting. The setting Secondary voltage defines the nominal voltage of the VT's
secondary winding. This is used as a reference to scale the measurements accordingly.
Division ratio setting defines the ratio for sensor use.
The division ratio for ABB voltage sensors is typically 10000:1. Thus,
the Division ratio setting is usually set to "10000". For more
information on Division ratio, see
voltages
The Voltage (Uo) residual voltage settings are also used for scaling the calculated
residual voltage in comparison to the measured residual voltage.
The Voltage (Uo) settings must be set for output URES_MEAS and
URES_CLC scaling. If the residual voltage is not connected to
UTVTR, Voltage (Uo) settings must be set only for the calculated
residual voltage URES_CLC scaling.
If the residual voltage is not connected to UTVTR, the Voltage (Uo)/
Primary voltage cannot be set smaller than 1/√3 times Voltage (3U)/
Primary voltage.
Voltage magnitude correction can be made using settings Amplitude Corr A,
Amplitude Corr B and Amplitude Corr C for an external three-phase VT and
Amplitude Corr setting for an external residual VT.
Voltage angle correction can be made using settings Angle Corr A, Angle Corr B and
Angle Corr C for an external three-phase VT and Angle correction setting for an
external residual VT.
The VT connection can be set using VT connection. For three phase-to-earth voltage
measurements, VT connection can be set to "Wye", and for three phase-to-phase
voltage measurements, VT connection can be set to "Delta".
The MINCB_OPEN input signal is connected through a relay binary input to the NC
auxiliary contact of the MCB protecting the VT secondary circuit. The MINCB_OPEN
section.
1MRS759142 C
Sensor inputs for currents and
Technical Manual
REX640