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12.1.1
12.2
12.2.1
108
Synchrocheck and energizing check (SYN)
Settings/Functions/Group n (n=1-4)/SynchroCheck/SynchroCheck1
Testing the frequency difference
The frequency difference is set at 0.40 Hz on the HMI, and the test should verify that operation
is achieved when the FreqDiffSynch frequency difference is lower than 0.40 Hz.
Procedure
1.
Apply voltages U-line (UL1) = 80% U1b, f-line=50.0 Hz and U-Bus (U5)
= 80% U1b, f-bus=50.3 Hz.
2.
Check that a closing pulse is submitted with length=0.20 seconds
and at closing angle=360 * 0.20 * 0.40=29 deg.
3.
Repeat with U-Bus (U5) = 80% U1b, f-bus=50.5 Hz to verify that the
function does not operate when freq.diff is above limit.
4.
Repeat with different settings on tBreaker and FreqDiffSynch.
5.
Make sure that the calculated closing angle is less than 60 deg.
6.
Verify that closing command is issued at the correct phase angle
when the frequency difference is less than the set value.
Testing the synchrocheck
During test of the synchrocheck function for a single bay arrangement, these voltage inputs are
used:
U-line
UL1, UL2 or UL3 voltage input on the terminal.
U-bus
U5 voltage input on the terminal
At test of the synchrocheck function for a 1 1/2 CB diameter the following alternative voltage
inputs can be used for the three synchrocheck functions. The voltage is selected by activation of
different inputs in the voltage selection logic:
SYN1
U-line
U-bus
SYN2
U-line
U-bus
UL1
Activate SYN1_FD1CLD
UL2
Activate SYN1_CB2CLD
U4
Activate SYN1_CB2CLD and CB3CLD
U5
No activation of inputs necessary
UL2
Activate SYN2_FD2CLD
U4
Activate SYN2_CB3CLD
UL1
Activate SYN2_FD1CLD
Chapter 13
Verifying settings by secondary
injection
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