3.36
SEL-400 Series Relays Instruction Manual Date Code 20171006
Basic Relay Operations
Examining Metering Quantities
Step 4. Set CT and PT ratios. The specific CT and PT configuration settings
depends on the relay. The following shows a typical set of configura-
tion choices. Use the terminal to set Group 1 setting CTRW := 200
(the CT W-input ratio), and PTRY := 2000.0 (the PT Y-input ratio).
a. Type SET CTRW TERSE <Enter>.
b. If the CTRW setting is not 200, type 200 <Enter>.
c. Proceed as shown in Figure 3.26 to PTRY and change PTRY to
2000.0, if needed.
d. Type END <Enter> to finish this settings session.
e. Answer Y <Enter> to the save settings prompt.
Step 5. Turn the relay off.
Step 6. Connect analog inputs. The specific connections depend on the relay.
The following illustrates a typical set of voltage and current connec-
tions.
a. If three voltage sources and three current sources are available,
connect the sources to the relay as shown in Figure 3.27.
If three voltage sources and two current sources are available, use
the connection diagram of Figure 3.28.
b. Apply 67 V per phase (line-to-neutral) in ABC phase rotation.
c. Apply 2.0 A per phase, in phase with the applied phase voltages.
=>>SET G ESS TERSE <Enter>
Global
Current and Voltage Source Selection
Current and Voltage Source Selection (Y,N,1,2,3,4) ESS := N ? 1 <Enter>
Line Current Source (IW,COMB) LINEI := IW ? END <Enter>
Save settings (Y,N) ? Y <Enter>
Saving Settings, Please Wait...........
Settings Saved
=>>
Figure 3.25 Setting ESS in the Terminal
=>>SET CTRW TERSE <Enter>
Group 1
Line Configuration
Current Transformer Ratio - Input W (1-50000) CTRW := 120 ?200 <Enter>
Current Transformer Ratio - Input X (1-50000) CTRX := 120 ? <Enter>
Potential Transformer Ratio - Input Y (1.0-10000) PTRY := 180.0 ?2000.0 <Enter>
PT Nominal Voltage (L-L) - Input Y (60-300 V,sec) VNOMY := 115 ?END <Enter>
Save settings (Y,N) ? Y <Enter>
Saving Settings, Please Wait...........
Settings Saved
=>>
Figure 3.26 Setting CTRW and PTRY in the Terminal
To Next Page
Loading...
