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Section 7
1MAC050144-MB C
Control functions
526
615 series ANSI
Technical Manual
The wiring should be verified by checking the reading of the phase difference measured
between the V_BUS and V_LINE voltages. The phase difference measured by the IED has
to be close to zero within the permitted accuracy tolerances. The measured phase
differences are indicated in the LHMI. At the same time, it is recommended to check the
voltage difference and the frequency differences presented in the Monitored data view.
These values should be within the permitted tolerances, that is, close to zero.
Figure 290 shows an example where the synchrocheck is used for the circuit breaker
closing between a busbar and a line. The phase-to-phase voltages are measured from the
busbar and also one phase-to-phase voltage from the line is measured.
Figure 290:
Connection of voltages for the IED and signals used in synchrocheck
7.3.6
Signals
Table 430: 25 input signals
L1
L3
VA
VB
VC
VG
VAB
Line
VAB
L2
Relay program
V_LINE
V_BUS
25
V_BUS
V_LINE
BYPASS
SYNC_INPRO
SYNC_OK
CL_FAIL_AL
CMD_FAIL_AL
CL_COMMAND
BLOCK
LLDB
LLLB
DLLB
DLDB
Name
Type
Default
Description
V_BUS
SIGNAL
0=False
Busbar Voltage
V_LINE
SIGNAL
0=False
Line Voltage
CL_COMMAND
BOOLEAN
0=False
External closing request
BLOCK
BOOLEAN
0=False
Blocking signal of the synchro check and voltage check
function
BYPASS
BOOLEAN
0=False
Request to bypass synchronism check and voltage check
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