Use the calculated single-phase fault (AG) values to simulate a three-phase fault. Voltages are
applied as indicated in the program. The calculated A-phase current magnitude is applied to
all three relay current inputs. Each current is applied lagging the corresponding voltage phase
angle by the transmission line angle. These values are shown in Table 7.3.
Table 7.3: Three-Phase Fault Voltages and Currents at MTA
VA
VB
VC
IA
IB
IC
34.58
34.58
34.58
5.33
5.33
5.33
Volts/Amps
0.00°
-120.00°
120.00°
-80.10° 1 5 9 . 9 0 °
39.90°
Degrees
Earlier in the Test Procedures two methods of observing element status were described target
LEDs and programmable output contacts. For the purposes of driving an external sense
contact, the remainder of the test procedure will use the programmable output contact method.
D. Three-Phase Fault Test
Purpose:
Determine the pickup of each phase-phase distance element for three-phase
faults at three points on the mho characteristic: MTA, MTA +45°, and MTA
-45°.
Method: 1.
Program the desired programmable output contact (Al - A4) to follow the
appropriate instantaneous phase distance element using the LOGIC command.
Select one of the phase distance elements from the first row of the Relay Word
as indicated below:
Z1P
= Zone 1 Instantaneous Phase Distance Element
Z2PT
= Zone 2 Time delayed Phase Distance Element
Z3P
= Zone 3 Instantaneous Phase and Ground Distance Element
Please note that the Z2PT element includes any delay set by the Z2DP timer
setting.
The following example outlines the procedure for testing the Zone 1 phase
distance element response to a three-phase fault.
2.
Connect the sources of voltage and current to the rear panel terminals of the
relay as per Figure 7.8a or Figure 7.8b. Figure 7.8a uses three current
sources, while Figure 7.8b uses only two.
7-18
Maintenance & Testing
SEL-221F, -1 Instruction Manual
Date Code 920508
Summary of Contents for SEL-221F
Page 3: ......
Page 10: ......
Page 11: ......
Page 12: ......
Page 13: ......
Page 69: ...Date Code 920508 Specifications SEL 221F 1 Instruction Manual 2 44 ...
Page 70: ...Date Code 920508 Specifications SEL 221F 1 Instruction Manual 2 45 ...
Page 71: ...Date Code 920508 Specifications SEL 221F 1 Instruction Manual 2 46 ...
Page 72: ...Date Code 920508 Specifications SEL 221F 1 Instruction Manual 2 47 ...
Page 110: ...Example Event Report 2 4 12 Event Reporting SEL 221F 1 Instruction Manual Date Code 930830 ...
Page 158: ...SETTINGS SHEET FOR SEL 221F RELAY PAGE 2 OF 6 DATE Date Code 921110 ...
Page 160: ...SETTINGS SHEET PAGE 4 OF 6 FOR SEL 221F RELAY DATE Date Code 930601 ...
Page 161: ...SETTINGS SHEET PAGE 5 OF 6 FOR SEL 221F RELAY DATE Date Code 961208 ...
Page 229: ...SEL 200 Series Relay Main Board Troubleshooting Test Points and Jumper Locations ...