# Synchrocheck - GE L90 Instruction Manual

L90 line current differential system ur series.

5.7 CONTROL ELEMENTS
PATH: SETTINGS
CONTROL ELEMENTS

## SYNCHROCHECK 1

5
The are two identical synchrocheck elements available, numbered 1 and 2.
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 ΔΦ and the frequency difference ΔF (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 × ΔΦ at a frequency equal
to the frequency difference ΔF. This time can be calculated by:
where: ΔΦ = phase angle difference in degrees; ΔF = frequency difference in Hz.
5-222
SYNCHROCHECK
SYNCHK1 FUNCTION:
Disabled
SYNCHK1 BLOCK:
MESSAGE
Off
SYNCHK1 V1 SOURCE:
MESSAGE
SRC 1
SYNCHK1 V2 SOURCE:
MESSAGE
SRC 2
SYNCHK1 MAX VOLT
MESSAGE
DIFF: 10000 V
SYNCHK1 MAX ANGLE
MESSAGE
DIFF:
30°
SYNCHK1 MAX FREQ
MESSAGE
DIFF: 1.00 Hz
SYNCHK1 MAX FREQ
MESSAGE
HYSTERESIS: 0.06 Hz
MESSAGE
SELECT: LV1 and DV2
MESSAGE
MAX VOLT: 0.30 pu
MESSAGE
MAX VOLT: 0.30 pu
SYNCHK1 LIVE V1
MESSAGE
MIN VOLT: 0.70 pu
SYNCHK1 LIVE V2
MESSAGE
MIN VOLT: 0.70 pu
SYNCHK1 TARGET:
MESSAGE
Self-reset
SYNCHK1 EVENTS:
MESSAGE
Disabled
T
=
L90 Line Current Differential System
SYNCHROCHECK 1(2)
Range: Disabled, Enabled
Range: FlexLogic™ operand
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: SRC 1, SRC 2, SRC 3, SRC 4
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
1
------------------------------- -
360°
×
ΔF
----------------- -
2 ΔΦ
×
5 SETTINGS
5.7.6 SYNCHROCHECK
(EQ 5.26)
GE Multilin