ABB Distribution Protection Unit 1500R/2000R
13-11
Applications Notes
9/99
website:www.abb.com/papd
schemes (such as fuse saving schemes) that disable instantaneous elements in any one of the recloser sequences.
Programming the Feeder DPU1500R/2000R
The feeder instantaneous overcurrent relay requires a faster trip response than the bus instantaneous overcurrent
relay. When a feeder fault occurs, timing coordination is crucial to allow the feeder relay to trip faster than the bus
relay.
1.
Set the 50P-1 and 50N-1 functions in the Primary Settings table as follows (see Figure 13-15):
a.
Set the curve to “Standard Instantaneous.”
b.
Select the desired pickup.
2.
At the Programmable Input/Output Screen, map the PUA condition to the desired output. See Figure 13-16.
Figure 13-15. Primary Settings for the Feeder DPU1500R/2000R
Figure 13-16. Pickup Alarm Input Logic