Delta 4000 Bedienerhandbuch PDF herunterladen (Seite 27)

81331 Rev 01 Nov 2010

Setup and Operation

Safety Precautions

Warning

The output of this test set can be lethal.

As with any high-voltage equipment, caution must be used at all times and all

safety procedures followed. Read and understand Section 2, Safety, before

proceeding. Be sure that the test specimen is de-energized and grounded before

making connections. Isolate power equipment to be tested from the high-voltage

busbars and attach necessary grounds to floating busbars in accordance with

standard company policy, observing all safety procedures. Make certain that no

one can come in contact with the high-voltage output terminal or any material

energized by the output. Be aware that when testing power cables high voltage

will be present at the remote end of the cable. Use protective barriers if

necessary. Locate the control unit and high-voltage unit in an area which is as dry

as possible. Maintain adequate clearances between energized conductors and

ground to prevent arc-over. Such accidental arc-over may create a safety hazard

or damage the equipment being tested.

Setup

The following steps are a general guide for setting up the test set. Figure 6 shows

a typical setup for testing inter-winding and ground capacitance on a three-phase

delta-wye power transformer; Figure 7 shows a typical setup for making

excitation current measurements on the same transformer. The test set controls

and connectors are identified in Figures 1 through 5. Refer to the Application

Guide for specific instructions on connecting this and other power equipment to

the test set.

When making capacitance measurements on transformer windings always short

each winding on itself with a jumper lead to eliminate winding inductance effect.

The shorting wire is usually non-insulated and must not be in contact with any

other insulated or non-insulated parts of the transformer.

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Delta 4000 Bedienerhandbuch Seite 27