DSTA180 DSTA180F ABB The control motherboard is commonly used for programmable controllers

Description

• DSTA180 DSTA180F These setpoints describe the characteristics of each transformer winding and the CTs

  connected to them.

  Note

  The above setpoint options are also available for the second and third winding. Winding 3

  setpoints are only visible if the unit has the appropriate DSTA180 DSTA180F hardware and if the selected

  TRANSFORMER TYPE is a three-winding transformer.

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  • 

  WINDING 1(3) NOM Φ−Φ VOLTAGE: Enter the nominal phase-to-phase voltage rating

  of Winding 1(3) of the transformer. The range for this setpoint is affected by the S2

  SYSTEM SETUP  TRANSFORMER  LOW VOLTAGE WINDING RATING setting (see table

  below).

  WINDING 1(3) RATED LOAD: Enter the self-cooled load rating for winding 1(3) of the

  transformer. The range for this setpoint is affected by the S2 SYSTEM SETUP 

  TRANSFORMER  LOW VOLTAGE WINDING RATING DSTA180 DSTA180F setting (see the table below).

  WINDING 1(3) PHASE CT PRIMARY: Enter the phase CT primary current rating of the

  current transformers connected to winding 1(3). The CT secondary current rating must

  match the relay phase current input rating indicated.

  WINDING 1(3) GROUND INPUT SELECTION: Select the ground CT (G1/2 or G2/3) for

  the particular winding required. Leave ground CT selection at default value of “None” if

  no CT is needed on the required winding.

  The ground input selection settings will be defaulted to “None” when an upgrade

  settings file is uploaded.

• Whenever transformer type is changed (particularly from 2 W to 3 W) “ground input

  selection” setting should be cross-checked.

  WINDING 1(3) GROUND CT PRIMARY: DSTA180 DSTA180F Enter the ground CT primary current rating of

  the current transformers connected in the winding 1(3) neutral to ground path. The CT

  secondary current rating must match the relay ground current input rating indicated.

  WINDING 1(3) SERIES 3-Φ RESISTANCE: Enter the series three-phase resistance of the

  winding (that is, the sum of the resistance of each of the three phases for the winding).

  This value is normally only available from the transformer manufacturer’s test report,

  and is used in the 745 for calculation of harmonic derating factor.

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