Synchrocheck - GE T60 Instruction Manual

5 SETTINGS
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PATH: SETTINGS CONTROL ELEMENTS
 SYNCHROCHECK 1
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The T60 Transformer Protection System is provided with an optional synchrocheck element. This element
is specified as a software option (select "10" or "11") at the time of ordering. Refer to the Ordering section
of chapter 2 for additional details.
There are four identical synchrocheck elements available, numbered 1 to 4.
The synchronism check function is intended for supervising the paralleling of two parts of a system which are to be joined
by the closure of a circuit breaker. The synchrocheck elements are typically used at locations where the two parts of the
system are interconnected through at least one other point in the system.
Synchrocheck verifies that the voltages (V1 and V2) on the two sides of the supervised circuit breaker are within set limits
of magnitude, angle and frequency differences. The time that the two voltages remain within the admissible angle differ-
ence is determined by the setting of the phase angle difference  and the frequency difference F (slip frequency). It can
be defined as the time it would take the voltage phasor V1 or V2 to traverse an angle equal to 2   at a frequency equal
to the frequency difference F. This time can be calculated by:
GE Multilin
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SYNCHROCHECK

SYNCHROCHECK 1(4)
SYNCHK1 FUNCTION:
Disabled
SYNCHK1 BLOCK:
Off
SYNCHK1 V1 SOURCE:
SRC 1
SYNCHK1 V2 SOURCE:
SRC 2
SYNCHK1 MAX VOLT
DIFF: 10000 V
SYNCHK1 MAX ANGLE
DIFF: 30°
SYNCHK1 MAX FREQ
DIFF: 1.00 Hz
SYNCHK1 MAX FREQ
HYSTERESIS: 0.06 Hz
SYNCHK1 DEAD SOURCE
SELECT: LV1 and DV2
SYNCHK1 DEAD V1
MAX VOLT: 0.30 pu
SYNCHK1 DEAD V2
MAX VOLT: 0.30 pu
SYNCHK1 LIVE V1
MIN VOLT: 0.70 pu
SYNCHK1 LIVE V2
MIN VOLT: 0.70 pu
SYNCHK1 TARGET:
Self-reset
SYNCHK1 EVENTS:
Disabled
T60 Transformer Protection System
5.7 CONTROL ELEMENTS
5.7.8 SYNCHROCHECK
Range: Disabled, Enabled
Range: FlexLogic operand
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: 0 to 400000 V in steps of 1
Range: 0 to 100° in steps of 1
Range: 0.00 to 2.00 Hz in steps of 0.01
Range: 0.00 to 0.10 Hz in steps of 0.01
Range: None, LV1 and DV2, DV1 and LV2, DV1 or DV2,
DV1 Xor DV2, DV1 and DV2
Range: 0.00 to 1.25 pu in steps of 0.01
Range: 0.00 to 1.25 pu in steps of 0.01
Range: 0.00 to 1.25 pu in steps of 0.01
Range: 0.00 to 1.25 pu in steps of 0.01
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
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