ABB RELION REX640, Техническое руководство, Страница: 198 / 1960

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
Chapter 3.12 Sensor inputs for currents and 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
signal receives information about the MCB open state. When
MINCB_OPEN
is active,
the outputs
ALARM
and
WARNING
are activated.
The MCB open state does not affect IEC 61850-9-2 sampled value quality
information.
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
SMV Max Delay setting defines how long the receiver waits for the SMV
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
SMV Max
Delay values include sampling, processing and network delay.
Basic functions 1MRS759142 F
198 REX640
Technical Manual