Delta 4000 Instruction Manual download pdf (Page 56)

81331 Rev 01 Nov 2010

Frequency Sweep

Delta4000 can also measure multiple frequencies in a “frequency sweep”.

Individual frequencies are defined in a list in PDB settings. The maximum

frequency range is pending the test voltage as described in the following table.

Test Voltage Maximum frequency

range

12 kV 45-70 Hz

4 kV 15-405 Hz

2 kV 8-505 Hz

1 kV 4-505 Hz

500 V 2-505 Hz

250 V 1-505 Hz

Note: Do not select the power frequency or any multiple of power frequency in a

frequency sweep, e.g. in 50 Hz networks avoid, 50, 100, 150… and in

60 Hz networks avoid 60, 120, 180…

Temperature Correction

Delta4000 offers two temperature correction methods;

Standard Temperature Correction Tables

This is the standard correction method based on tables for various components.

For power transformers the table selection is based on manufacturing year,

transformer type (sealed, free breathing etc), voltage and power rating. For

bushings the table is selected by manufacturer and type.

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Delta 4000 Instruction Manual Page 56