ABB 5751017-L DSTC456 multiplexer

Description

• DSTC456 This section contains the settings to configure the tap position input. The 745 accepts a

  resistive input from the tap changer control circuitry, which is used in the 745 to

  dynamically correct for CT ratio mismatch based on the dynamically changing voltage

  ratio of the transformer. Thus, the percent differential DSTC456 function of the device can be set for

  greater sensitivity. See Dynamic CT Ratio Mismatch Correction on page 5–6 for more details

  on the tap position input.

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  • 

  WINDING WITH TAP CHANGER: Enter the winding with the tap changer. Enter ‘None’

  for a transformer with no onload tap changer, or to disable this feature.

  NUMBER OF TAP POSITIONS: Enter the number of tap positions here.

  MINIMUM TAP POSITION VOLTAGE: Enter the DSTC456 voltage at the lowest tap position. This is

  an auto-ranging setpoint dependent on S2 SYSTEM SETUP  TRANSFORMER  LOW

  VOLTAGE WINDING RATING; see ranges in the table below.

  VOLTAGE INCREMENT PER TAP: Enter the voltage increment for each tap. The range is

  affected by the setpoint. This is an auto-ranging setpoint dependent on the S2 SYSTEM

  SETUP  TRANSFORMER  LOW VOLTAGE WINDING RATING value; see ranges in the

  following table:

• The 745 calculates the individual harmonics in each of the phase current inputs up to the

  21st harmonic. With this information, it calculates an estimate of the effect of non

  sinusoidal load currents on the transformer rated full load current. These calculations are

  based on ANSI/IEEE Standard C57.110-1986, and DSTC456 require information that is often only

  available from the transformer manufacturer’s test report, including the three-phase

  resistance of each winding and the load loss at rated load. The harmonic derating factor

  will only be valid if this information has been entered correctly.

  The 745 also calculates the total harmonic distortion of the phase current input signals.

  The band of frequencies over which this calculation is made can be changed to be more

  selective than the default 2nd to 21st harmonics.

  HARMONIC DERATING FUNCTION: Enter “Enabled” to enable the harmonic derating

  factor calculations.

  THD MINIMUM/MAXIMUM HARMONIC NUMBER Enter the minimum/maximum

  harmonic number of the frequency band over which total harmonic distortion is

  calculated.

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