ABB RELION REX640 Technical Manual page 198

Basic functions
The sensor's or the VTs' primary rated voltage can be set using
setting. The setting
secondary winding. This is used as a reference to scale the measurements
accordingly.
Division ratio setting defines the ratio for sensor use.
The Voltage (Uo) residual voltage settings are also used for scaling the calculated
residual voltage in comparison to the measured residual voltage.
Voltage magnitude correction can be made using settings
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
and
external residual VT.
The VT connection can be set using
measurements,
voltage measurements,
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
signal receives information about the MCB open state. When MINCB_OPEN is active,
the outputs ALARM and WARNING are activated.
The WARNING and URES_WARNING outputs in the receiver are activated if the
synchronization accuracy of the sender or the receiver is worse than 4 μs. The
outputs remain on for 10 seconds after the synchronization accuracy returns within
limits.
ALARM and URES_ALARM in the receiver are activated if the synchronization accuracy
of the sender or the receiver is not within tolerances. The outputs remain on for
10 seconds after the synchronization accuracy returns within limits. If the effect
on protection is negligible, the WARNING, URES_WARNING, ALARM or URES_ALARM
outputs are not activated.
The
frames before activating the ALARM and URES_ALARM outputs. This setting can be
accessed via Configuration > System. Waiting for the SMV frames delays the local
measurements of the receiver to keep them correctly time aligned. The
Delay values include sampling, processing and network delay.
198
Secondary voltage defines the nominal voltage of the VT's
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
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.
Angle Corr C for an external three-phase VT and Angle correction setting for an
VT connection can be set to "Wye", and for three phase-to-phase
VT connection can be set to "Delta".
The MCB open state does not affect IEC 61850-9-2 sampled value quality
information.
SMV Max Delay setting defines how long the receiver waits for the SMV
Chapter 3.12 Sensor inputs for currents and voltages
VT connection . For three phase-to-earth voltage
1MRS759142 F
Primary voltage
Amplitude Corr A ,
Angle Corr A , Angle Corr B
SMV Max
Technical Manual
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REX640