phase difference to the voltages between the high- and low-voltage sides. The angle
adjustment can be used to meet synchronism.
The vector group of the power transformer is defined with clock numbers, where
the value of the hour pointer defines the low-voltage side phasor and the high-
voltage side phasor is always fixed to the clock number 12, which is the same
as zero. The angle between clock numbers is 30º. When comparing phase angles,
the U_BUS input is always the reference. This means that when the Yd11 power
transformer is used, the low-voltage side voltage phasor leads the high-voltage side
phasor by 30º or lags by 330º. The rotation of the phasors is counterclockwise.
The generic rule is that a low-voltage side phasor lags the high-voltage side phasor
by clock number · 30º. This is called angle difference adjustment and can be set for
ASGCSYN with the
Phase shift
setting.
9.6.7 Signals
9.6.7.1 ASGCSYN Input signals
Table 1519: ASGCSYN Input signals
Name Type Default Description
U3P1 SIGNAL - Three-phase voltages
(generator side)
U3P2 SIGNAL - Three-phase voltages
(bus side)
BLOCK BOOLEAN 0=False Blocking signal of the
auto synchronization
function
CL_COMMAND BOOLEAN 0=False External closing re-
quest
EXT_CHECK BOOLEAN 0=False External permissive
check for CB close
BYPASS BOOLEAN 0=False Request to bypass
synchronism check
and voltage check
GCB_TEST BOOLEAN 0=False Circuit breaker test
position status
GCB_CLOSE BOOLEAN 0=False Circuit breaker close
status
GCB_OPEN BOOLEAN 0=False Circuit breaker open
status
ISO_A_CLOSE BOOLEAN 0=False Isolator A close sta-
tus
ISO_B_CLOSE BOOLEAN 0=False Isolator B close sta-
tus
Table continues on the next page
Control functions 1MRS759142 F
1580 REX640
Technical Manual
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