Synchrocheck (Ansi 25) - GE D30 Instruction Manual

CONTROL ELEMENTS

5.8.5 Synchrocheck (ANSI 25)

SETTINGS  CONTROL ELEMENTS  SYNCHROCHECK  SYNCHROCHECK 1(4)
 SYNCHROCHECK 1

5
There are four identical synchrocheck elements available, numbered 1 to 4.
The synchronism check function supervises the paralleling of two parts of a system that 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
difference 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 takes 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 is calculated by:
where
ΔΦ is phase angle difference in degrees
ΔF is frequency difference in Hz
5-228
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
1
T = ---------------------------- -
360°
--------------- -
× ΔF
2 ΔΦ ×
Range: Disabled, Enabled
Range: FlexLogic operand
Range: SRC 1, SRC 2
Range: SRC 1, SRC 2
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
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
Eq. 5-20