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-UEN E
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
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
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:
I
I njected W
IECEQUATION18059 V1 EN-US
•
•
Transformer protection RET670
Commissioning manual
Equal to the tested three-phase pickup value from winding one side if the
ZSCurrSubtrW1 = Off .
parameter
Greater for factor 1.5 from the tested three-phase pickup value from winding one
ZSCurrSubtrW1 = On .
side if the parameter
The pickup current is independent of the actual phase angle shift across
the protected PST.
I2/I1Ratio parameter) shall be added to the fundamental
I5/I1Ratio parameter) shall be added to the fundamental frequency
CTsec

W 2
* I
_ 2 Base W _ 2
CTprim
W 2
The phase angle for all three injected current on the test set shall have the
same value of zero degree. As a consequence the, PSTPDIF function will
work in either of the following two ways:
ZSCurrSubtrW2 = Off and all three differential currents and the
Trip, if parameter
bias current shall be 100%. These values are available as outputs and service values
from the PSTPDIF function.
ZSCurrSubtrW2 = On and all three differential currents and
Not trip, if parameter
the bias current shall be 0%. These values are available as outputs and service
values from the PSTPDIF function.
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Testing functionality by secondary injection
GUID-E3AF062D-9040-4784-831E-23F91638C69C v1
GUID-A87F73CC-76A9-4661-9BA9-E19B902845D6 v1
(Equation 3)
Section 11
103