ABB RELION REX640 Technical Manual page 195

1MRS759142 C
REX640
Technical Manual
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.
Outputs WARNING and URES_WARNING are always internally active whenever
outputs ALARM and URES_ALARM, respectively, are active.
The receiver activates the WARNING, URES_WARNING, ALARM and URES_ALARM
outputs if any of the quality bits, except for the derived bit, is activated. When the
receiver is in the test mode, it accepts SMV frames with test bit without activating the
WARNING, URES_WARNING, ALARM and URES_ALARM outputs.
Frequency adaptive measurements for three-phase voltages can be activated with the
setting Frequency adaptivity. Four selections are provided.
Table 126: Frequency adaptivity setting for three-phase voltage measurement
Setting value
Disable
Enable
Main frequency source
Backup frequency source
Basic functions
Description
Frequency adaptive measurements are disabled
for this UTVTR. Measurements are fixed to
nominal frequency defined with Configuration/
System/Rated frequency.
Frequency adaptive measurements are enabled.
In this case, the estimated network frequency is
defined by another preprocessing block.
Frequency adaptive measurements are enabled
and other preprocessing blocks follow the network
frequency defined by this preprocessing block.
Frequency adaptive measurements are enabled.
If the main frequency source cannot determine the
network frequency, the voltages of this
preprocessing block determine the network
frequency.
Section 3
189