ABB REL670 - Page 106

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Distance protection Chapter 11
Verifying settings by secondary
injection
Figure 31: Operating principle and characteristic of the PSD function
The PSD can operate in two modes when configured for; “one of three phase operation” and
“two out of three phase operation”. Check the configuration to see which of these is valid for the
IED.
5.3.1 Testing overview
Procedure
1. Re-configure the binary output from the ZOUT signal to the START
signal of the PSD function.
It is also possible to observe the START signal on the regular output ter-
minals, if provided during the engineering stage. Check the correspond-
ing IED documentation.
2. Slowly decrease the measured voltages in all three phases until the
W-meter detects the appearance of the START signal.
3. Increase the measured voltages to their rated values.
4. Decrease instantaneously voltages in all three phases to the values,
which are approximately 20% lower than the set value
R1IN.
The START signal must not appear.
jX
R
tP1
Impedance locus at power swing
99000159.vsd
−
⋅
K
X
X
IN
1
−
X
IN
1
X
IN
1
KX
X
IN
⋅
1
−
⋅
KR R
IN
1
KR
R
IN
⋅
1
−
R
IN
1
INR1