Test system for high-voltage components

A method for constructing a test arrangement comprising (i) a test system having a plurality of test components including an AC voltage source for producing a variable test voltage, a measuring apparatus for recording current pulses caused by partial discharge, and an evaluation apparatus for the recorded current pulses, (ii) an electrically-grounded test container in which at least one of the test components are arranged, and (iii)

• a distribution transformer connected to the AC voltage source as a test object, wherein the distribution transformer is supported on insulation means that electrically insulates the distribution transformer, the method comprising:
• arranging the test system with the electrically-grounded test container in a vicinity of the distribution transformer;
• lifting the distribution transformer using a lifting tool;
• positioning the insulation means under the distribution transformer;
• lowering the distribution transformer onto the insulation means;
• electrically connecting the test components;
• and
• electrically connecting a ground potential of the electrically-grounded test container to at least one of the plurality of test components of the test object distribution transformer which are grounded during normal operation.

A test arrangement for in-situ partial discharge measurements in distribution transformers, comprising:

• a test system including an electrically-grounded test container and a plurality of test components arranged within the electrically-grounded test container, the plurality of test components including an AC voltage source for producing a variable test voltage, a measuring apparatus for recording current pulses caused by partial discharge, an evaluation apparatus for the recorded current pulses;
• a distribution transformer arranged as a test object connected to the AC voltage source;
• and
• an insulator supporting the distribution transformer to electrically insulate the distribution transformer;
• wherein the distribution transformer is electrically grounded through the electrically-grounded test container.