Megger 569001 Operating Manual

Instruction Manual AVTM56-9J Rev. A

For the

Ultrasonic Corona and Leak Detector

Catalog Number 569001 and Accessories

P.O. BOX 9007, VALLEY FORGE, PA 19485-1007 ! 1-800-723-2861

The industry leader since 1895, AVO Biddle Instruments offers a comprehensive line of electrical test and measurement products, from portable instruments for use in the field to fully-integrated systems for high voltage systems testing. AVO Biddle Instruments fulfills a range of requirements found in electric utility, large industrial, electrical apparatus manufacturing, military and governmental applications worldwide.

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Instruction Manual 56-9J

for the use of

ULTRASONIC CORONA

and LEAK DETECTOR

Catalog Number 569001

AVO International

P.O. Box 9007

Valley Forge, PA 19485-1007

TABLE OF CONTENTS

FIG. 1: ULTRASONIC CORONA AND LEAK DETECTOR CAT. NO. 569001 ..a1

FIG. 2: ACCESSORY ITEMS. ...........................................................................a2

INTRODUCTION ............................................................................................... A1

SAFETY PRECAUTIONS.................................................................................. B1

RECEIVING INSTRUCTIONS ........................................................................... C1

DESCRIPTION AND SPECIFICATIONS........................................................... D1

OPERATION...................................................................................................... E1

APPLICATION ....................................................................................................F1

MAINTENANCE................................................................................................. G1

WARRANTY AND REPAIRS ............................................................................. H1

FIGURE 1: ULTRASONIC CORONA AND LEAK DETECTOR CATALOG NO. 569001

Contact Probe, Catalog No. 569001-8

Ultrasonic Tone Generator, Catalog No. 569001-7

FIGURE 2: ACCESSORY ITEMS.

Section A

INTRODUCTION

Electrical discharges from a high voltage terminal to the air (corona) or along an insulated surface generate acoustical signals. Over a wide range of circumstances a significant portion of the generated signal energy will have frequencies above the range of the human ear. This is the ultrasonic frequency range and may be used to detect the presence of corona or surface discharge with the advantage that audible background noise is excluded.

Corona and surface discharge are localized to small areas relative to the total size of the equipment. The Biddle Cat. No. 569001 Ultrasonic Corona and Leak Detector is equipped with a highly directional horn to permit the user to localize the source of the electrical discharge while remaining at a safe distance from the electrical terminals. This directional property also increases the sensitivity of the detector and tends to exclude any ultrasonic signals not related to the test in progress. The Cat. No. 569001 is effective in locating corona on insulators, bushings, and potheads in energized circuits such as utility poles, non-enclosed switchgear, bus bars or transformers and aids in isolating multiple sources located on the equipment under test. It is also useful in checking insulation test setups for either ac or dc to determine if corona is present on the test terminals. Pinpointing such corona and demonstrating its reduction will usually result in considerable saving of testing time and assist in obtaining reliable results.

The Detector is designed for easy use. It is supplied in a compact light-weight carrying case; it operates on a single transistor battery and is quickly ready for service in the field or on the test floor.

In addition to detecting corona sources, the Detector is an excellent tool for locating gas leaks and other sources of ultrasound.

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