Schweitzer Engineering Laboratories SEL-311A, Instruction Manual

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13-26 Testing and Troubleshooting Date Code 20011205
SEL-311A Instruction Manual
=>>SET L 1 OUT106 <ENTER> SET L 1 OUT106 <ENTER> SET L 1 OUT106 <ENTER> SET L 1 OUT106 <ENTER>
SELogic group 1
OUT106 =0
? F32Q <ENTER> F32Q <ENTER> F32Q <ENTER> F32Q <ENTER>
OUT107 =0
? R32Q <ENTER>
R32Q <ENTER> R32Q <ENTER>
R32Q <ENTER>
DP1 =52A
? END <ENTER> END <ENTER> END <ENTER> END <ENTER>
After you type END <ENTER> to end the set procedure, the relay displays the
current logic settings. At the prompt, type Y <ENTER> to accept those settings.
Connect outputs OUT106 and OUT107 to the sense input of your test set, an
ohmmeter, or some other contact sensing device.
Step 3. Connect the three voltage sources and one current source to the relay as shown in
Figure 13.5.
Step 4. As described above, the relay 32Q elements operate based upon the magnitude and
angle of negative-sequence voltages and currents. You can calculate the magnitude
and angle of V2 and I2, given the magnitude and angle of each of the phase
quantities using the equations below.
( )
( )
C B
2
A 3
1
2
C B
2
A
3
1
2
I a I a I I
V a V a V V
× + × + × =
× + × + × =
Using a single-phase current source simplifies the I
2
calculation.
( )
A
3
1
2
C B
I • I
amps 0 I I
=
= =
Assume that you apply the following test voltages:
° Ð =
° - Ð =
° Ð =
120 V 0 . 67 V
120 V 0 . 67 V
0 V 0 . 49 V
C
B
A
( )
volts 120 67 • 120 1 120 67 • 240 1 0 0 . 49 • V
3
1
2
° Ð ° Ð + ° - Ð ° Ð + ° Ð =
( )
volts 180 0 . 6 V
volts 120 67 120 67 0 0 . 49 • V
2
3
1
2
° Ð =
° - Ð + ° Ð + ° Ð =
Determine the test angle of A-phase current from the Z1ANG relay setting. For
Equation 13.1 to yield a positive result, I
A
, hence I
2
, should lag V
2
by the angle of
Z1ANG. For Equation 13.1 to yield a negative result, I
A
should lead V
2
by (180° -
Ð
Z1ANG°).
When you apply the voltage signals shown above, V
2
is 180° out of phase from V
A
.
Take this into account, and calculate the angle of I
A
with respect to the angle of V
A
.