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ABB Distribution Protection Unit 1500R
9/99
Cold Load Time Mode
The cold load time can be either in seconds or minutes. The time itself is set in the primary settings menu. See Section
1 for details on this function.
79V (O->IU<) Time Mode
The 79V time can be either in seconds or minutes. The time itself is set in the primary settings menu. See Section 1 for
more details on this function.
Voltage Display Mode
Select "Vll" for voltages to be displayed Line to Line.
Select "Vln" for voltages to be displayed Line to Neutral.
Zone Sequence Coordination
The zone sequence coordination function coordinates the instantaneous functions within the reclosing sequence of
the upstream and downstream reclosing devices. Applications include fuse-saving schemes for faults that occur
beyond the downstream reclosers. Refer to Application Note AN-23.
Enable the ZSC function by (1) enabling it in the Configuration Settings and (2) mapping the ZSC logic function to a
contact input in the Programmable Inputs screen of the Windows External Communications Program. The 50P-1/50N-
1 or 50P-2/50N-2 and 50P-3/50N-3 instantaneous functions in the upstream DPU1500R must be set for a time delay that
is equal to or greater than the clearing time of the downstream device. The Reset Time setting of the upstream DPU1500R
must also be longer than the longest open interval time of the downstream device.
When the ZSC function is enabled and the DPU1500R senses a fault downstream, the relay increments through its
reclose sequence. For example, if the downstream device is activated by a phase to ground fault, the DPU1500R must
see a fault current greater in value than the lowest pickup setting of any of the phase overcurrent protective functions.
The zone sequence step occurs when the fault current exceeds the enabled lowest pickup setting and then decreases to
less than 90 percent of the setting value before its time delay setting is exceeded. The recloser reset time is displayed
when a zone sequence step occurs. All zone sequence coordination steps that occur are logged in the Fault Summary
and Fault Record.
Target Display Mode
Select "Last" if the only target desired on the front panel of the relay is the most recent target. If "All" is selected, then
all targets will remain displayed since the last target reset.
Local Edit
"Enable" allows settings to be changed via the MMI.
"Disable" disallows setting changes via the MMI.
This setting can only be edited remotely via communications.
website:www.abb.com/papd
Configuration Settings
2-3
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