ABB RELION REX640 Technical Manual page 1410

Section 9
Control functions
1404
PH DIFF MEAS _ _
= ∠
GUID-3248978F-7AC8-475D-ABE5-F26227139EFA V1 EN
∠U Measured bus side voltage phase angle
Bus
∠U Measured generator side voltage phase angle
Gen
Phase shift Setting Phase shift
The synchronism conditions are checked according to several criteria.
• The measured bus and generator voltages are higher than the set value of Live
voltage value (ENERG_STATE equals "Both Live").
• The measured bus and generator frequencies are both within the range of 95...105
percent of the nominal frequency (f
• The measured bus and generator voltages are lower than the set value of
Maximum voltage.
If the Synchrocheck mode parameter under the Setting menu is set as
"Command", then the SynchroChk Mod Ctl parameter under the
Control menu is used to set values "OFF/Asynchronous". Otherwise,
the Synchrocheck mode parameter under the Setting menu is used to
set the values "Off/Asynchronous".
Some additional conditions must also be fulfilled as per the set Synchrocheck mode.
Table 1356: Additional conditions for the synchro check
Measurements
U_DIFF_MEAS
PH_DIFF_MEAS
FR_DIFF_MEAS
Closing angle
U U Phase shift
− ∠ −
Gen Bus
).
n
Synchrocheck mode
"Asynchronous"
< Voltage Diff Ov Ex and > -Voltage Diff Un Ex
< Angle Diff positive and > - Angle Diff negative
< Freq Diff OV Synch and > -Freq Diff sub Synch
< Angle Diff positive and >- Angle Diff negative
1MRS759142 C
(Equation 320)
REX640
Technical Manual