Date Code 20011026 Maintenance and Testing 7-45
SEL-321/321-1 Instruction Manual
Note: As you perform this test, other protection elements may assert, causing the relay to
close other output contacts and assert relay targets. This is normal and is not a cause
for concern.
Ground Quadrilateral Distance Element Reactive Reach Test Using Three Voltage
Sources and One Current Source
Note: This test refers directly to the Zone 2 ground quadrilateral distance element, but may
be applied to any other forward-reaching ground quadrilateral distance element zone.
To test reverse-reaching zones, simply add 180° to the calculated test current phase
angle. Verify correct operation of the 32QR element for the test voltage and current
signals using Equation 7.2 in the Negative-Sequence Directional Element Test
Procedure of this section.
Step 1. Execute the SHOWSET command and verify the following relay settings: Z1MAG,
Z1ANG, QUADZ, DIR2, XG2, RG2, 50L2, 50G2, k0M, k0A, T, Z2F, and 50QF.
The example relay settings use the following settings: Z1MAG = 7.8 Ω; Z1ANG =
83.97°; QUADZ = 3; DIR2 = F; XG2 = 9.36 Ω; RG2 = 5.00 Ω; 50L2 = 0.90; 50G2 =
0.60; k0M = 0.726; k0A = -3.69; T = 0.00; Z2F = 0.77; 50QF = 0.5 amps secondary.
Execute the SET command and change the following settings. Change GMHOZ to
N, QUADZ to 3, XG1 = 6.24, XG2 = 9.36, XG3 = 1.87, RG1 = 2.5, RG2 = 5.0, and
RG3 = 6.0. Changing the GMHOZ setting prevents the relay ground mho distance
elements from interfering with the test.
Step 2. Select output contacts to indicate operation of the Z2G element. In this example we
use the OUT7 output.
From Access Level 2, execute the SET L n command to configure Output 7 to close
for assertion of the Z2G element.
=>>SET L 1 OUT7 <ENTER>
SET L 1 OUT7 <ENTER>SET L 1 OUT7 <ENTER>
SET L 1 OUT7 <ENTER>
SELogic group 1
OUT7 =NA
? Z2G
Z2GZ2G
Z2G <ENTER>
<ENTER><ENTER>
<ENTER>
OUT8 =32QR
? END <ENT
END <ENTEND <ENT
END <ENTER>
ER>ER>
ER>
After you type END <ENTER> to end the set procedure, the relay displays the
current logic settings. Type Y <ENTER> to accept those settings.
Connect output OUT7 to the sense input of your test set, an ohmmeter, or some other
contact sensing device.
To Next Page
Loading...
