Completing The Test; Impedance Protection; Distance Protection Zones, Quadrilateral Characteristic Zmqpdis; Transformer Protection Ret670 - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
4. Slowly decrease the positive sequence currents (i.e. all three phases together) for
winding two side until the PSTPDIF function gives a trip signal. At that moment, pause
the injection and note down the values of all three differential currents in percent. The
bias current still should have the same value (i.e. x*100%). Similarly, note the secondary
current magnitude for winding one and two sides injected at that point of time.
5. Stop the injection and repeat above points 1-4 for different x-values.
6. From the recorded differential and bias values in percent, draw the operating
characteristic from the measurements. Compare the values as described in the
Manual .
11.3.5.9

Completing the test

Continue to test another function or end the test by navigating to Main menu/Test/IED test
mode/TESTMODE:1 and change the
settings to their original values, if they were changed for testing purposes.
11.4

Impedance protection

11.4.1 Distance protection zones, quadrilateral characteristic
ZMQPDIS
Prepare the IED for verification of settings outlined in Section
settings".
Measure operating characteristics during constant current conditions. Keep the measured
current as close as possible to its rated value or lower. But make sure it is higher than the set
minimum operating current.
Ensure that the maximum continuous current to the IED does not exceed four times its rated
value, if the measurement of the operating characteristics runs under constant voltage
conditions.
The test procedure has to take into consideration that the shaped load encroachment
characteristic is active. It is therefore necessary to check the setting. To verify the settings
with the shaped load encroachment characteristic the test should be carried out according to
figures
activated tests according to the adjusted figures should be carried out.
To verify the settings for the operating points according to the following fault types should be
tested:
• One phase-to-phase fault
• One phase-to-earth fault
The shape of the operating characteristic depends on the values of the setting parameters.
106
25 and 26 and tables 20
The figures illustrating the characteristic for the distance protection function
can be used for settings with and without load encroachment. The solid lines
designate the diagram applicable when the load current compensation is
active. The solid line and all test points except 13 are valid for this case.
When the load current compensation is inactive, the dotted lines and test point
13 are valid. Test points 5, 6, and 7 are not valid for this measurement.
© Copyright 2017 ABB. All rights reserved
IEDTestMode setting to Off . Restore connections and
and 21. In cases where the load encroachment characteristic is
1MRK 504 165-UEN E
Technical
GUID-AC1E3D35-47CA-47C8-B653-C6F525A1CE31 v1
GUID-AF589812-9034-4DA4-B081-E3ACBA947058 v9
"Preparing the IED to verify

Transformer protection RET670

Commissioning manual

SEMOD53525-1 v2