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700 Series AC Dielectric Test Systems - Overview

Hipotronics standard line of AC dielectric testing equipment is designed to perform high voltage AC tests on electrical apparatus in accordance with IEC60, IEEE 4, and IEC 270 and other national test standards. A variety of mechanical configurations are available to suit different installation conditions. There are eight Power Rating categories ranging from 1KVA to 100KVA, and five models per Power Rating category.

Some models can be supplied in mobile versions for instance where it is difficult to move the test object to the test area. For any high voltage AC test, Hipotronics can help decide and provide the appropriate testing equipment.



700 Series AC Dielectric Test Systems

  • Continuously adjustable output voltage.
  • Newly redesigned Auto and Manual Programmable Controller.
  • Designed to operate from 10% to 100% of the maximum rated output voltage.
  • Easily accessible meter for recalibration access.
  • Adjustable overload from 10% to 110% of rated output current.
  • Backup breaker overload safety.
  • Output connected voltmeter and ammeter.
  • Zero start interlock ensures that voltage control is at a minimum before HV can be energized.
  • Rated current available from zero to rated voltage.


  • Simple to use - minimal amount of setup time and intuitive control panel allows simple testing.
  • Surge-compensated HV transformer windings for withstanding flashovers at full voltage.
  • Output connected meters ensures for fast accurate readings.
  • Surge and transient protection on all meters, transformers etc.
  • Partial discharge testing - low PD levels available at full output voltage (PD levels need to be specified when ordering system and may require additional components).
 Selecting an AC Test Set
 In order to properly size an AC Test Set, it is necessary to have the following information:
  1. Maximum test voltage required: The maximum test voltage is determined by the relevant standard that the equipment is being built to, plus any additional user-defined over sizing to take into account changes to test standards, or special end-user requirements.
  2. The power rating: To determine the power rating, the capacitance, resistance or inductance of the load must be known. High voltage test objects are usually capacitive in nature.
  3. PD requirements: Partial discharge testing is usually performed at lower levels than AC withstand levels. If partial discharge testing is required it is necessary to know the PD sensitivity level for the test and the test voltage. Specifying too high a PD test voltage or unnecessarily low PD free rating for the system inflates the cost of a test system.
  4. Environment: Most testing is done indoors in reasonable environments. If the HV test transformer is to be located outdoor or in a harsh environment, bushing size and tank design will change.
 Current Versus Capacitive Load
 If the load is predominantly capacitive, the test current required can be calculated by using the following formula:

 A = 2 x fCV

  • A = Test current in Amps
  • f  = Test frequency in Hertz
  • C = Total test load capacitance in Farads
  • V = Test voltage in Volts

Once these four things are known, the test voltage and load current can be used to determine the rating of the system. It is suggested that you also consider rating your system 10% to 20% higher in voltage and up to 50% higher in current to accommodate future, unanticipated test requirement changes.


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Macey's Electrical Pty. Ltd.
ABN 17 344 601 468
Unit 1, 49 Gavenlock Road, Tuggerah, NSW Australia 2259
Phone: +61 2 4353 4644    Mobile: 0412 678 925