ABB Distribution Protection Unit 1500R
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DPU1500R - Quick Start
The purpose of this document is to provide an engineer or technician with all of the necessary information on how to test
trip and reclose in a new DPU1500R relay. It will answer all of the questions most frequently asked by users who are
not familiar with the relay. It is recommended that the initial tests performed be done according to the Acceptance Test
procedure in this instruction manual before attempting to test with operational settings.
Initial Tripping
When right from the factory, mostly all of the protection functions in the DPU1500R are disabled in the Primary Settings.
Only the functions 51P (3I>), 50P-1 (3I>>1), 51N (IN>), and 50N-1 (IN>>1) are enabled. The Time Overcurrent elements
are set to pick up at 6 amperes and the Instantaneous to trip at 3 times this setting or 18 amperes. Given the default
curve (extremely inverse) and time dial (5), 12 Amps rms into one phase and out another should trip the 51P (3I>) in
about 16 seconds.
It is not enough that the settings are enabled directly as above, they must also be enabled in the Recloser Trip
Functions settings 79-1 (O->I1), 79-2 (O->I2), 79-3 (O->I3), 79-4 (O->I4), and 79-5 (O->I5). Only the functions that are
enabled (or set to lockout) can trip the relay during that recloser cycle. That is, only functions enabled (set to lockout)
in 79-1 (O->I1)can trip the relay before it’s first reclose, only the functions enabled in 79-2 (O->I2) can trip between the
first and second reclose, and so on. Elements that are selected “Disable” in any reclose sequence will not operate.
From the factory, only the functions 51P (3I>), 50P-1 (3I>>1), 51N (IN>), and 50N-1 (IN>>1) are enabled in setting 79-
1 (O->I1). The 51P (3I>) function is not in the list because it is always enabled. To add to the list in 79-1 (O->I1), a
function must first be enabled outside of 79-1 (O->I). The new function will then appear in the 79-1 (O->I1) list as
“Disabled” and must be set to “Enable” or “Lockout”. The preceding statements are also applicable to all of the other
Recloser Trip step settings, 79-2 (O->I2) through 79-5 (O->I5).
Another way to disable (torque control) protection functions is by mapping that function to one of the programmable
inputs in the Programmable Inputs screen using WinECP. Mapping a function to an input will disable that function if
there is no control voltage detected on that input’s terminals. An will disable the function when control voltage is
detected on that input’s terminals.
From the factory, no tripping functions are disabled in this way. The only functions that are mapped to inputs are the
52A (XO), 52B (XI), and 43A (AR) functions which are mapped to IN-1, IN-2, and IN-3 respectively.
Yet another way that a function can be disabled is by deselecting it from the Master Trip Output screen. The Master
Trip Output allows the user to choose which tripping function will activate the main trip contact and provides a way to
separate the different tripping functions among programmable output contacts. From the factory, all tripping functions
are mapped to the main trip output.
Reclosing
When the DPU1500R with factory settings is first powered up, the red “Recloser Out” front panel target LED will be lit
indicating that the reclosing function is disabled. There are a few different ways that reclosing is defeated in the factory
settings. Any one of them is capable of disabling the recloser by itself and must each be taken into account. They are
listed here:
1.
The 43A (AR) function is mapped with a programmable input IN-3. Enable the recloser by connecting control
voltage to IN-3 or by unmapping the 43A (AR) input.
2.
The factory settings do not map the CLOSE function to any programmable output. Use WinECP to map CLOSE to
OUT-1 or any other output contact.
3.
The 79-1 (O->I1) Open Time setting is initially set to “Lockout”. Change this setting to some time interval.
Introduction
