Testing the frequency difference
M2377-116 v11
The frequency difference test should verify that operation is achieved when the
frequency difference between bus and line is less than set value of FreqDiffMax
and above set value of FreqDiffMin. The test procedure below will depend on the
settings used. Input STARTSYN must be activated during the test.
FreqDiffMax = 0.2 Hz
FreqDiffMin = 0.01 Hz
tBreaker = 0.080 s
1. Apply voltages
1.1. U-Line = 100% UBaseLine and f-Line = 16.7 Hz
1.2. U-Bus = 100% UBaseBus and f-Bus = 16.85 Hz
2. Check that a closing pulse is submitted at a closing angle equal to calculated
phase angle value from the formula below. Modern test sets will evaluate this
automatically.
Closing Angle = |( (f
Bus
– f
Line
) * tBreaker * 360 degrees) |
f
Bus
= Bus frequency
f
Line
= Line frequency
tBreaker = Set closing time of the breaker
3. Repeat with
3.1. U-Bus = 100% UBaseBus and f-bus = 16.95 Hz, to verify that the
function does not operate when frequency difference is above limit.
4. Verify that the closing command is not issued as the frequency difference is
not within the limits.
10.9.1.2 Testing the synchrocheck functionality
M2377-132 v9
During the test of SESRSYN for a single bay arrangement, these voltage inputs are
used:
U-Line
UL1 or UL2 line voltage input on the IED according to the connection in SMT
U-Bus Bus voltage input on the IED according to the connection in SMT
Testing the voltage difference
M2377-194 v8
Set the voltage difference to 0.15 p.u. on the local HMI, and the test should check
that operation is achieved when the voltage difference UDiffSC is lower than 0.15
p.u.
The settings used in the test shall be final settings. The test shall be adapted to site
setting values instead of values in the example below.
Test with no voltage difference between the inputs.
1MRK 506 377-UEN C Section 10
Testing functionality by secondary injection
Railway application RER670 2.2 IEC 131
Commissioning manual
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