Table 7.6: Zone 1 Phase-Phase Test Voltages and Currents, BC Fault
VA
VB
V C
I A
IB
IC
67.00
44.93
44.93
0.00
4.61
4.61
Volts/Amps
0.0° -138.2°
138.2°
0.0° -170.1°
9.9°
Degrees
4.
Adjust the test set voltages and currents to the values in Table 7.6. Do not turn
on the currents at this point.
5.
Turn on the voltage sources VA, VB, and VC.
6.
Apply current to the relay and ramp the current source magnitudes together
until the monitored output contact closes, indicating pickup. Record the pickup
current threshold and compare it to the calculated threshold.
To calculate the phase-phase element reach, first calculate the resultant test
voltage (VBC) and current (IBC).
BC Fault
VB
= 44.93 V
∠
-138.2°
VC
= 44.93 V
∠
138.2°
VBC =VB - VC = 59.90 V
∠
-90°
IB
= 4.61 A
∠
-170.1°
IC
= 4.61 A
∠
9.9°
IBC
= IB - IC = 9.22 A
∠
-170.1°
Zone 1 reach secondary along the MTA,
secondary
In primary ohms,
Zone 1 reach primary along the MTA,
primary
Where PTR = 2000 and CTR = 200.
7.
Find two other convenient test points. Consider a square inscribed in a mho
circle with one diagonal being the diameter along the MTA. The two corners
of that square on the other diagonal are reached by increasing the current by a
factor of 1.414 at angles of ±45° from the angle obtained using the ONEBUS
program.
7-24
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 ...