ABB Distribution Protection Unit 1500R
11-10
Maintenance and Testing
9/99
website:www.abb.com/papd
Timing Tests
Follow these steps to test the timing of the DPU1500R:
1.
Connect the DPU1500R as shown in Figure 11-5.
2.
Apply a fault current of 12 A to the relay. This current is 2x the default pickup current of 6.0 A. The relay should trip
between 14.5 and 16.7 seconds (derived from the Extremely Inverse Curve, Figure 1-4, by using the default
values in Table 11-1).
3.
Apply a fault current of 24 A to the relay (4x the default pickup current). The relay should trip between 3.0 and 3.5
seconds.
4.
Apply a fault current of 36 A to the relay (6x the default pickup current). The relay should trip between 1.4 and 1.6
seconds.
+
_
1
2
54
53
31
32
33
34
Ia (L1)
Van (UL1)
Vbn (UL2)
Vcn (UL3)
Vn (UN)
Control
Power
1-Phase
Current
3-Phase
Voltage
DPU1500R
29
30
Start/Stop
Timer
Figure 11-5. Test Circuit for Timing and Recloser Lockout