Testing The Synchronizing Function; Testing The Synchrocheck Functionality - ABB RET670 Commissioning Manual

1MRK 504 165-UEN A
11.10.1.1
11.10.1.2
Transformer protection RET670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection

Testing the synchronizing function

The voltage inputs used are:
UP3LN1 UL1, UL2 or UL3 line 1 voltage inputs on the IED
UP3BB1 Bus1 voltage input on the IED
Testing the frequency difference
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 = 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
f = Bus frequency
Bus
f = Line frequency
Line
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.

Testing the synchrocheck functionality

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
– f ) * tBreaker * 360 degrees) |
Bus Line
Section 11
M2377-21 v8
M2377-116 v11
M2377-132 v9
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