Verifying The Single-Phase Pickup From Winding One Side; Verifying The Zero-Sequence Current Reduction From Winding Two Side - ABB Relion 670 Series Commissioning Manual

1MRK 504 165-UUS Rev. J
I
Pickup
IECEQUATION18058 V1 EN-US
3. Check that the trip and alarm contacts operate according to the configuration logic.
4. Decrease the current slowly from the operate value and note the reset value.
5. Switch off the currents and connect an external timer to measure the operate time of the function.
Set the current in all three phases to twice the above measured pickup value.
6. Switch on the currents and note the operate time of the PSTPDIF function.
7. Check that the trip information is stored in the IED internal Event List and Disturbance Recorder.
8. Check that the trip information is properly indicated on the LHMI LEDs.
11.3.5.4

Verifying the single-phase pickup from winding one side

1. Connect the test set for three-phase currents injection to the current terminals of the IED, which are
connected to the CTs on the winding one side of the power transformer.
2. Increase the current magnitude in phase L1 only until the protection function operates and note the
secondary current at the moment of pickup. The operating secondary current should have one of
the following two values:
•
•
3. Check that the trip and alarm contacts operate according to the configuration logic.
4. Decrease the current slowly from the operate value and note the reset value.
5. If available on the test set, a second harmonic current of about 20% (assumes 15% default setting
value for I2/I1Ratio parameter) shall be added to the fundamental frequency current in phase L1.
Increase the fundamental frequency current magnitude in phase L1 above the pickup value
measured in step 2. Make sure that trip signal from the PSTPDIF function is not given. Check that
the second harmonic blocking is active in the corresponding phase.
6. If available on the test set, a fifth harmonic current of about 30% (assumes 25% default setting
value for I5/I1Ratio parameter) shall be added to the fundamental frequency current in phase L1.
Increase the fundamental frequency current magnitude in phase L1 more than the pickup value
measured in step 2. Make sure that trip signal from the PSTPDIF function is not given. Check that
the fifth harmonic blocking is active in the corresponding phase.
7. Repeat the procedure by injecting current in phases L2 and L3 respectively.
11.3.5.5

Verifying the zero-sequence current reduction from winding two side

1. Connect the test set for three-phase currents injection to the current terminals of the IED, which are
connected to the CTs on the winding two side of the power transformer.
2. Inject current in all three phases with equal magnitudes corresponding to the rated load of the PST
(i.e. 100%) in secondary amperes as given below:
Transformer protection RET670
Commissioning manual
CTsec

W 1
* IdMin I *
3 Ph W CTprim
1
W 1
The pickup current is independent of the actual phase angle shift across the
protected PST.
Equal to the tested three-phase pickup value from winding one side if the parameter
ZSCurrSubtrW1 = Off.
Greater for factor 1.5 from the tested three-phase pickup value from winding one side if the
parameter ZSCurrSubtrW1 = On.
The pickup current is independent of the actual phase angle shift across the
protected PST.
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Base W _ 1
Section 11
Testing functionality by secondary injection
(Equation 2)
GUID-E3AF062D-9040-4784-831E-23F91638C69C v1
GUID-A87F73CC-76A9-4661-9BA9-E19B902845D6 v1
103