Z2DG AND Z3DG TIMER TESTS
Purpose:
Verify the Z2DG and Z3D timer accuracies.
Method: 1 .
Program the Z3 bit in the Relay Word into one of the available outputs
(A1 - A4) to start an external timer.
2.
Program the Z2GT bit into a different output to stop the timer.
3.
Apply a Zone 2 AG fault as in Table 7.13 for a duration which exceeds the
Z2DG setting.
Table 7.13: Standard Zone 2 AG Fault Using Factory Relay Settings
2AG Fault
VA
VB
VC
IA
IB
IC
35.59
74.39
74.27
3.03
0.00
0.00
Volts/Amps
0.0° -128.6°
128.7°
-80.4°
0.0°
0.0°
Degrees
4.
Repeat steps 1 to 3, substituting Z3T for Z2GT in the appropriate programm-
able output. Table 7.14 shows a standard Zone 3 AG fault. Apply this 3AG
fault for a duration which exceeds the Z3D setting.
Table 7.14:
Standard Zone 3 AG Fault
Using Factory Relay Settings
3AG Fault
VA
VB
VC
IA
I B
IC
43.07
72.49
72.39
2.31
0.00
0.00
Volts/Amps
0.0° -126.7°
126.8°
-80.4°
0 . 0 °
0.0°
Degrees
Note:
If an external timer is not available, use event report time tags to
calculate Z2DG and Z3D time delays with the following steps.
5.
Mask only the Z2GT bit of the Relay Word into the MTU mask. Zero the
MTO mask out so no other condition can assert the TRIP output.
Date Code 920508
Maintenance & Testing
SEL-221F, -1 Instruction Manual
7-33
Summary of Contents for SEL-221F
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Page 69: ...Date Code 920508 Specifications SEL 221F 1 Instruction Manual 2 44 ...
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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 ...