ABB RELION RET670, Commissioning Manual, Page: 148 / 328

11.4.9 Power swing detection ZMRPSB (68)
The aim is to verify that the settings of the Power swing detection function ZMRPSB (68)
is according to the setting table and to verify that ZMRPSB (68) operates as expected.
Prepare the IED for verification of settings outlined in Section "Preparing the IED to
verify settings" .
Before starting this process, all impedance measuring zones shall be set and in operation.
Test the outer resistive boarder in forward and reverse direction,
RLdOutFw and
RLdOutRv and the inner reactive boarder in forward and reverse direction X1InFw and
X1InRv . See figure 37 .
The corresponding resistive border for the inner resistive boundary and outer resistive
boundary is calculated automatically from the setting of
kLdRFw and kLdRRv .
The inner zone of ZMRPSB (68) must cover all zones by at least 10% margin.
The test is mainly divided into two parts, one which aim is to verify that the settings are
in accordance to the selectivity plan and a second part to verify the operation of ZMRPSB
(68). The proposed test points for validation of the settings are numbered according to
figure
37
Test of the interactions or combinations that are not configured are not considered in this
instruction.
Section 11
1MRK 504 165-UUS -
Testing functionality by secondary injection
142 Transformer protection RET670 2.2 ANSI
Commissioning manual