Megger MIT30 Bedienungsanleitung

AVTMMIT30-EN

Rev E02

June 2009

Instruction Manual

-30kV DC Insulation Tester

MIT30

Catalog No. MIT30

High Voltage Equipment

THIS EQUIPMENT PRODUCES

INSTANTANEOUSLY LETHAL VOLTAGE

Please read carefully before operating

Safety is the responsibility of the user

Valley Forge Corporate Center

2621 Van Buren Avenue

Norristown, PA 19403-2329

U.S.A.

610-676-8500

www.megger.com

-30kV DC Insulation Tester

MIT30

Catalog No. MIT30

Instruction Manual

The information presented in this manual is believed to

be adequate for the intended use of the product. If the

product or its individual instruments are used for

purposes other than those specified herein, confirmation

of their validity and suitability must be obtained from

Megger. Refer to the warranty information below.

Specifications are subject to change without notice.

WARRANTY

Products supplied by Megger are warranted against

defects in material and workmanship for a period of 12

months following shipment. Our liability is specifically

limited to replacing or repairing, at our option, defective

equipment. Equipment returned to the factory for repair

must be shipped prepaid and insured. Contact your

MEGGER representative for instructions and a return

authorization (RA) number. Please indicate all pertinent

information, including problem symptoms. Also specify

the serial number and the catalog number of the unit.

This warranty does not include batteries, lamps or other

expendable items, where the original manufacturer’s

warranty shall apply. We make no other warranty. The

warranty is void in the event of abuse (failure to follow

recommended operating procedures) or failure by the

customer to perform specific maintenance as indicated in

this manual.

Valley Forge Corporate Center

2621 Van Buren Avenue

Norristown, PA 19403-2329

U.S.A.

610-676-8500

www.megger.com

AVTMMIT30-EN Rev E02 June 2009

Table of Contents

1 INTRODUCTION ...........................................................1

How to Use this Manual....................................................1

2 SAFETY PRECAUTIONS..............................................3

3 RECEIVING INSTRUCTIONS....................................7

4 SPECIFICATIONS...........................................................9

Input.....................................................................................9

Output..................................................................................9

Control...............................................................................10

Safety ..................................................................................11

Physical ..............................................................................11

Environmental ..................................................................12

Regulatory Compliance....................................................12

5 DESCRIPTION...............................................................13

6 SETTING UP...................................................................15

Selection of Location .......................................................15

Clearances..........................................................................16

Connections Procedure ...................................................17

7 OPERATION ..................................................................19

TEST PROCEDURE .....................................................19

USE OF GUARD............................................................21

8 ROUTINE MAINTENANCE .....................................23

Before Each Use...............................................................23

Inspection and Maintenance Procedure........................24

Calibration Procedure......................................................25

9 THEORY OF OPERATION &

TROUBLESHOOTING ................................................29

10 NOMENCLATURE.....................................................33

Field Replaceable and Recommended Spare Parts......33

AVTMMIT30-EN Rev E02 June 2009

INTRODUCTION

This instruction manual is intended as a guide to

the operation of the MIT30. The instructions and

suggestions provided in his manual anticipate the

normal use of the insulation tester for testing

electrical insulation systems.

In the normal course of testing, a specimen or

system is subjected to high DC voltage. The

resulting current and the manner in which the

current varies with time, provides data that

indicates the condition of the specimen or system

insulation.

How to Use this Manual

Typographic Conventions

Numbered lists show procedural steps.

Bullets list items and options.

Warning and Caution Notices

Warning and caution notices are used throughout

this manual where applicable. These notices

AVTMMIT30-EN Rev E02 June 2009

appear in the format shown below and are

defined as follows:

WARNING!

Warning, as used in this manual,

is defined as a condition or

practice which could result in

personal injury or loss of life.

CAUTION

Caution, as used in this manual,

is defined as a condition or

practice which could result in

damage to or destruction of the

equipment or apparatus under

test.

NOTES: Provide important information

AVTMMIT30-EN Rev E02 June 2009

SAFETY PRECAUTIONS

SAFETY IS THE RESPONSIBILTY OF THE

USER

The test set and the equipment to which it is

connected is a source of high-voltage electrical

energy. All persons performing or assisting in the

tests must use all practical safety precautions to

prevent contact with energized parts of the test

equipment and associated circuits. Persons

actually engaged in the test must stand clear of all

parts of the complete high voltage circuit unless

the test set is de-energized and all parts of the test

circuit are grounded. Persons not directly

associated with the work must be kept away from

the test activities by suitable barriers, barricades or

warnings.

The test set must be connected to a reliable local

ground to prevent possible shock danger to the

operator. Since the energized test setup may

induce a static charge on nearby insulated objects,

including people, all insulated objects must be

grounded or kept at least three feet (0.91 meters)

from the energized structure.

AVTMMIT30-EN Rev E02 June 2009

WARNING

Never connect the test set to

energized equipment or use the

test set in an explosive

atmosphere.

All apparatus to be tested should be bonded to

ground except during the actual test. Test

connections should be made with the ground

bonds in place.

NOTE: Please note that even isolated conductors may

develop static charge due to nearby electrical

fields.

At the completion of a test, after the power

source has been shut down and the test set kV

meter reads zero, all energized parts of the test

setup MUST be short circuited by means of a

safety grounding/discharge rod or “hot stick.”

Ground bonds should then be applied to the

equipment that was tested. These should be left in

place until access to the equipment is again

required.

If the test set is operated in accordance with the

safety precautions noted above and if all grounds

are correctly made, rubber gloves are not

necessary. That being so stated, please observe all

governmental, local, work regulations as

applicable with regard to operating or working in

proximity to high voltage electrical energy. Ensure

the use of all PPE (Personal Protective

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