7 Acceptance/Protection Function Test Guide
D02706R02.30
L-PRO 4000 User Manual
7-35
3. Increase A Phase voltage:
At 70.0 to 74.0 V (expect 72 V):
59 Aux O/V = High
Contact 13 = Closed
59 Main O/V remains Low
Contact 14 = Open
4. With A Phase voltage still increased, increase B and C phase V.
At 70 to 74 V (expect 72 V):
59 Aux O/V = High
59 Main O/V = High
Contact 14 = Closed
End of 59 test.
50N/51N Neutral
Overcurrent
Test
Neutral Instantaneous and Time Overcurrent Test
Settings
• Both Directional
• 50N Pickup = 10.0 A
• 51N Pickup = 1.0 A
• Time Curve = IEEE Moderately Inverse
A = 0.0103
B = 0.0228
p = 0.02
TMS = 3.0
Figure 7.25: Neutral Instantaneous and Time Overcurrent Logic (50N/51N)
0
50 3IO
286
If Directional or combined, T must be greater than 10 ms
5ms
T
0
Timer is active, only if it's directional or combined
287
51 3IO
50N directional control
51N directional control
Out 6
Alarm
Out 7
Summary of Contents for L-PRO 4000
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