Testing the power swing detection logic ZMBURPSB (68)
GUID-E19CFFAA-3853-4895-A149-32F6E78B2C69 v1
Preconditions
The following output signals shall be configured to binary outputs: ZOUT, measured impedance within
outer impedance boundary and ZIN, measured impedance within inner impedance boundary and
PICKUP, power swing detection.
1. Set X1InFw, R1LIn, X1InRv, R1FInFw, R1FInRv, ArgLd, RLdOutFw, RLdOutRv, kLdRFw and
kLdRRv to values that are in accordance with the selectivity plan and the corresponding operating
characteristic is shown in Figure
40.
2. Set OperationLdCh to On and set timers tP1, tP2, tW and tH to their default values.
3. Enable the input signal REL1PH to detect the power swing in one of the three phases.
4. The test points that are to be considered for the power swing detection are shown in Figure
40.
R
X
X1OutFw
X1InFw
RLdInFw
RLdOutRv
X1InRv
P1
RLdOutFw
RLdInRv
P2P3
IEC18000100-2-en.vsdx
IEC18000100 V1 EN-US
Figure 40: Proposed test points to detect power swing conditions
Where,
φ =
tan
-1
(X1InFw/R1LIn)
5. Inject voltage in one of the three phases in accordance with the test point P1 by keeping constant
current in three phases throughout testing and maintaining rated voltage for the other two phases.
6. Vary the faulty phase voltage to achieve the impedance at the test point P2. At this point, observe
that the output ZOUT is activated and then continue to inject for a duration greater than tP1.
7. Inject the faulty phase voltage to achieve the impedance at the test point P3. At this point, observe
that the outputs ZIN and START are activated. It indicates that power swing has been detected.
Section 11 1MRK 504 165-UUS Rev. J
Testing functionality by secondary injection
136 Transformer protection RET670
Commissioning manual
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