CHAPTER 5: SETTINGS
CONTROL ELEMENTS
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
5-273
5
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
Δ
F (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
Δ
F. This time is calculated by:
Eq. 5-24
where
ΔΦ
is phase angle difference in degrees
Δ
F is frequency difference in Hz
If one or both sources are de-energized, the synchrocheck programming can allow for closing of the circuit breaker using
undervoltage control to bypass the synchrocheck measurements (dead source function).
SYNCHK1 V1 SOURCE
— This setting selects the source for voltage V1 (see the Notes section that follows).
SYNCHK1 V2 SOURCE
— Selects the source for voltage V2, which must not be the same as used for the V1 (see Notes).
SYNCHK1 MAX VOLT DIFF
— Selects the maximum primary voltage difference in volts between the two sources. A primary
voltage magnitude difference between the two input voltages below this value is within the permissible limit for
synchronism.
SYNCHK1 MAX ANGLE DIFF
— Selects the maximum angular difference in degrees between the two sources. An angular
difference between the two input voltage phasors below this value is within the permissible limit for synchronism.
SYNCHK1 MAX FREQ HYSTERESIS
— Specifies the required hysteresis for the maximum frequency difference condition. The
condition becomes satisfied when the frequency difference becomes lower than
SYNCHK1 MAX FREQ DIFF
. Once the
Synchrocheck element has operated, the frequency difference must increase above the
SYNCHK1 MAX FREQ DIFF + SYNCHK1
MAX FREQ HYSTERESIS
sum to drop out (assuming the other two conditions, voltage and angle, remain satisfied).
SYNCHK1 SYNC CLOSE
— Enables the dynamic mode of synchrocheck. When it is enabled, the location of where the present
V2 vector will be arriving to synchronize (shown as V2' in the figures here) with breaker close time being taken into account
will be predicted based on the measured slip frequency so that breaker close command can be issued in advance to
ensure the synchronism at the time when the breaker is actually closed.
SYNCHK1 V2 ANGLE
SHIFT: 0
Range: -180 to +180 degrees in steps of 1
SYNCHK1 DEAD SOURCE
SELECT: LV1 and DV2
Range: None, LV1 and DV2, DV1 and LV2, DV1 or DV2,
DV1 Xor DV2, DV1 and DV2
SYNCHK1 DEAD V1
MAX VOLT: 0.30 pu
Range: 0.04 to 1.25 pu in steps of 0.01
SYNCHK1 DEAD V2
MAX VOLT: 0.30 pu
Range: 0.04 to 1.25 pu in steps of 0.01
SYNCHK1 LIVE V1
MIN VOLT: 0.70 pu
Range: 0.04 to 1.25 pu in steps of 0.01
SYNCHK1 LIVE V2
MIN VOLT: 0.70 pu
Range: 0.04 to 1.25 pu in steps of 0.01
SYNCHK1 TARGET:
Self-reset
Range: Self-reset, Latched, Disabled
SYNCHK1 EVENTS:
Disabled
Range: Disabled, Enabled
Содержание D30 series
Страница 10: ...x D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL TABLE OF CONTENTS ...
Страница 14: ...1 4 D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL FOR FURTHER ASSISTANCE CHAPTER 1 INTRODUCTION 1 ...
Страница 52: ...2 38 D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL SPECIFICATIONS CHAPTER 2 PRODUCT DESCRIPTION 2 ...
Страница 534: ...5 324 D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL TESTING CHAPTER 5 SETTINGS 5 ...
Страница 564: ...6 30 D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL PRODUCT INFORMATION CHAPTER 6 ACTUAL VALUES 6 ...
Страница 578: ...7 14 D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL TARGETS MENU CHAPTER 7 COMMANDS AND TARGETS 7 ...
Страница 614: ...9 26 D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL FAULT LOCATOR CHAPTER 9 THEORY OF OPERATION 9 ...
Страница 654: ...A 10 D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL FLEXANALOG ITEMS APPENDIX A FLEXANALOG OPERANDS A ...
Страница 662: ...C 6 D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL COMMAND LINE INTERFACE APPENDIX C COMMAND LINE INTERFACE C ...
Страница 670: ...iv D30 LINE DISTANCE PROTECTION SYSTEM INSTRUCTION MANUAL ABBREVIATIONS ...
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