Verifying The Three-Phase Pickup From Winding Two Side; Verifying The Single-Phase Pickup From Winding Two Side - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
11.3.5.6

Verifying the three-phase pickup 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 symmetrical three-phase currents (for example, positive sequence current only).
Increase the current magnitude symmetrically in all three phases until the protection
function operates and note the operating current. The operating secondary current
should have the following value:
I
P ickup
IECEQUATION18060 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.
11.3.5.7

Verifying the single-phase pickup 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. Increase the current magnitude in phase L1 only until the protection function operates
and note the operating current. The secondary current at the moment of pickup will be
greater for a certain factor from the measured three-phase pickup value depending on
the set value for the parameter
the protected power transformer for which the test is conducted, as explained below:
•
104
CTsec

W 2
* IdMin I *
3 Ph W CTprim
2
W 2
The pickup current is independent of the actual phase angle shift across
the protected PST.
ZSCurrSubtrW2 = Off , this factor will have a value between 1.00 and 1.50
When
depending on the actual phase angle shift as shown in
IEC18000247 V1 EN-US
Figure 23: Single-phase pickup factor when ZSCurrSubtrW2 = Off
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Base W _ 2
ZSCurrSubtrW2 and the actual phase angle shift across
1MRK 504 165-UEN E
GUID-11BB9D92-941D-4803-A319-578A049A7743 v1
(Equation 4)
GUID-1DB4BF90-236B-4F15-A5A4-8BB6327CBF2B v1
Figure 23:
Transformer protection RET670
Commissioning manual