Testing the frequency difference
M2377-116 v10
The frequency difference test should verify that operation is achieved when the frequency
difference between bus and line is less than set value of
FreqDiffMaxand above set value of
FreqDiffMin. The test procedure below will depend on the settings used. Input STARTSYN
must be activated during the test.
FreqDiffMax = 50.2 Hz
FreqDiffMin = 50.01 Hz
tBreaker = 0.080 s
1.
Apply voltages
1.1. U-Line = 100%
UBaseLine and f-Line = 50.0 Hz
1.2. U-Bus = 100%
UBaseBus and f-Bus = 50.15Hz
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 = 50.25 Hz, to verify that the function does not
operate when frequency difference is above limit.
4.
Verify that the closing command is not issued when the frequency difference is less than
the set value
FreqDiffMin.
12.10.1.2
Testing the synchrocheck check
M2377-132 v8
During the test of SESRSYN for a single bay arrangement, these voltage inputs are used:
U-Line
UL1, UL2 or UL3 line 1 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.
Test with a voltage difference higher than the set
UDiffSC.
1.
Apply voltages U-Line (for example) = 80%
GblBaseSelLine and U-Bus = 80%
GblBaseSelBusGblBaseSelBus with the same phase-angle and frequency.
2.
Check that the AUTOSYOK and MANSYOK outputs are activated.
3.
The test can be repeated with different voltage values to verify that the function
operates within the set
UDiffSC. Check with both U-Line and U-Bus respectively lower
than the other.
4.
Increase the U-Bus to 110%
GblBaseSelBus, and the U-Line = 90% GblBaseSelLine and
also the opposite condition.
5.
Check that the two outputs for manual and auto synchronism are not activated.
Section 12
1MRK 502 067-UEN B
Testing functionality by secondary injection
206
Commissioning manual
