7 Acceptance/Protection Function Test Guide
D02706R02.30
L-PRO 4000 User Manual
7-21
So,
A Phase Phasor = Unfaulted = 66.4 V
0
B Phase Phasor = Faulted = 37.4 V
-152.5
C Phase Phasor = Faulted = 37.4 V
+152.5
Connecting the Test Source for B-C Fault:
Figure 7.13: AC Connections to the relay for B-C (21P) Test
In summary for this example, inject Phase B to Phase C fault:
Line Impedance = 7.38
Line Angle = 80
Fault Voltage = 34.5 V
-90
using the calculated voltage phasors
Fault Current = greater than 1.6 A
(-90
- 80
) = greater than 1.6 A
-
170
21P2 Test Procedure
1. In Relay Control Panel access relay
Metering>Logic>Protection.
Monitor the following element for pickup: 21P2 Zone 2 Pickup.
2. Apply the following 3-phase voltages to the relay main ac V terminals:
Ph A: 330, 66.4 V
0
Ph B: 331, 37.4 V
-152.5
Ph C: 332, 37.4 V
+152.5
Ph N: 333
3. Connect variable single-phase current source (lagging phase-to-phase fault
voltage by 80
) to the relay main line current terminals (Jumper Terminals
303 & 305):
Ph B-C: 302
–
304, 1.5 A
-170
Observe 21P2 Alarm = Low
4. Increase current.
At 2.23 to 2.45 A (expect 2.34 A):
21P2 Alarm = High
5. Turn off voltage and current sources.
330
A
B
C
A
B
C N
Main Current Inputs
Main Voltage Inputs
L-PRO
331
333
332
AC Current
AC Voltages
+
+
+
+
+
+
Summary of Contents for L-PRO 4000
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