ABB Distribution Protection Unit 1500R
2-1
Configuration Settings
9/99
website:www.abb.com/papd
Configuration Settings
Phase CT Ratio
Phase current transformer turns ratio. The range is from 1 - 2000 turns.
VT Ratio
Voltage transformer turns ratio. The range is from 1 - 2000 turns.
VT Conn
Must be entered for proper DPU1500R metering and protection.
Options are:
69V Wye (Star)
120V Wye (Star)
120V Delta
208V Delta
Line Impedances
The line impedances are used for fault location purposes. The settings are positive and zero sequence reactance and
positive and zero sequence resistance in primary ohms per mile. The ranges are .001 to 4.00 primary ohms/mi. See the
section on “Fault Locator” in Section 7.
Line Length
The line length is used for fault location purposes. The range is from 0.1 to 125 miles. See the section on “Fault
Location” in Section 1.
Breaker Trip Fail Timer
The DPU1500R determines a successful trip by the state of the 52a and 52b breaker contacts and the level of input
current. The 52a and 52b contacts must indicate an open breaker and the current must have dropped to below 5 percent
of the 51P pickup setting. At the time that the DPU1500R issues a trip, it also starts a “Trip Fail Timer”. This timer is used
to determine a failed or slow breaker. It is set in the Configuration Setting and is selectable for 5 to 60 cycles in 1 cycle
steps. If the timer expires before the DPU1500R determines an open breaker (either or both conditions stated above are
met), a Breaker Failure Alarm, BFA, logical output is asserted and the recloser will lockout. If the DPU1500R determines
an open breaker within the Trip Fail Time setting, it will reset and re-enable when the breaker is reclosed. The Trip Fail
Timer is set by factory default to 18 cycles.
Breaker Close Fail Timer
The DPU1500R determines a successful close by the state of the 52a and 52b breaker contacts. The 52a and 52b
contacts must indicate a closed breaker. At the time that the DPU1500R issues a close, it also starts a “Close Fail
Timer”. This timer is used to determine a failed or slow breaker. It is set in the Configuration Setting and is selectable for
18 to 999 cycles in 1 cycle steps. If the timer expires before the DPU1500R determines a closed breaker (condition
stated above is met), the DPU1500R will halt its automatic reclose or manual close operation and wait for the proper state
to appear. If the close failure occurred while the recloser was at a certain reclose step, I.E. 79-3, the DPU1500R will stay
at that step until the breaker is finally closed back in. When this occurs, the reset timer will run and the reclose
sequence will pickup where it left off. If a subsequent trip occurs, the relay will lock out. If the DPU1500R determines a
closed breaker within the Close Fail Time setting, it will reset and re-enable when the breaker is opened. The Close Fail
Timer is factory default to 18 cycles.
