Megger 220015 Series Bedienungsanleitung

AVTM22-15Ja

Rev A

May2005

15 kV DC Dielectric

Test Set

Catalog No. 220015 Series

HIGH-VOLTAGE EQUIPMENT

PLEASE READ CAREFULLY BEFORE OPERATING

Safety is the responsibility of the user

APARATO DE VOLTAJE ALTO

SIRVANSE LEER ESTE LIBRO CON CUIDADO

ANTES OE OPERARLO

La seguridad es el cargo del operador

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. Specifications are

subject to change without notice.

MMegger

Valley Forge Corporate Center

2621 Van Buren Avenue

Norristown, PA 19403-2329 USA

Tel: 610-676-8500

Fax: 610-676-8610

www.megger.com

AVTM22-15Ja Rev. A May 2005

Table of Contents

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

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

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

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

5 DESCRIPTION.......................................................................................15

General.......................................................................................................15

Electrical....................................................................................................15

Power Supply Option..............................................................................17

Overcurrent and Overvoltage Trip.......................................................18

6 CONTROL AND CONNECTOR IDENTIFICATION...............25

7 SETTING UP...........................................................................................27

Preparation................................................................................................27

Selection of Location...............................................................................27

Connections Procedure...........................................................................28

Clearances..................................................................................................29

Power Supply Option, Catalog No. 220015-47...................................30

8 OPERATION...........................................................................................35

Test Procedure..........................................................................................35

Breakdown of Test Item.........................................................................36

Normal Shutdown Procedure................................................................37

Interrupting a Test...................................................................................37

9 OPERATION NOTES...........................................................................39

Line Voltage..............................................................................................39

Meter Range Settings During Transit....................................................39

Stabilizing Switch......................................................................................40

Stabilizing Switch (-50 Option)..............................................................40

Use of Guard.............................................................................................41

Voltage Control Scale..............................................................................41

Use of Regulation Curve (-50 Option).................................................42

Step Voltage Testing................................................................................42

Fault Locating (Breakdown Testing).....................................................42

External Current Meter...........................................................................44

AVTM22-15Ja Rev. A May 2005

10 APPLICATION NOTES......................................................................47

Theory of Insulation Testing.................................................................47

Applying the Test Set to Grounded Test Object................................48

Three-Terminal vs. Two-Terminal Tests.............................................49

Measuring an Ungrounded Test Item...................................................49

Generalized Combined 2 and 3 Terminal Measurement...................51

11 ROUTINE MAINTENANCE.............................................................53

Introduction..............................................................................................53

Inspection and Maintenance Procedure...............................................53

12 TROUBLESHOOTING AND REPAIR..........................................57

General......................................................................................................57

Case Repairs..............................................................................................58

Repairs to Components of Chassis And Panel...................................58

Changing Line Voltage Tap (-47 Models Only)..................................59

Replacement of Output Cable W101....................................................59

Replacement of Meters or Meter Amplifier Board............................60

Replacement of Current Meter Range Circuit.....................................60

Replacement of Voltmeter Range Circuit............................................60

Replacement of Stabilizing Switch S1...................................................61

Replacement of Circuit Breakers...........................................................61

Replacement of Voltage Control Autotransformer T1......................62

Replacement of the K2 Assembly.........................................................62

Replacement of Chassis-Mounted Assemblies....................................62

Replacement of Circuit Card U2...........................................................63

Calibration of Voltmeter.........................................................................63

Calibration of Current Meter.................................................................64

Adjustment of R1 in Stabilization Network (-50 Option).................66

Catalog No. 220015-50...........................................................................66

Catalog No. 220015-47,-50.....................................................................67

Trouble Location Chart..........................................................................68

13 PERFORMANCE CHECK.................................................................73

14 PARTS LIST............................................................................................75

15 WARRANTY AND REPAIRS............................................................77

Warranty....................................................................................................77

Repairs.......................................................................................................77

iii

AVTM22-15Ja Rev. A May 2005

List of Figures

Figure a: The Megger Catalog No. 220015 DC Dielectric Test Set.........2

Figure 1: Schematic Diagram of Catalog No. 220015.............................19

Figure 2: Schematic Diagram of Catalog No. 220015-50.......................20

Figure 3: Schematic Diagram of Catalog No. 220015-42.......................21

Figure 4: Schematic Diagram of Catalog No. 220015-43.......................22

Figure 5: Schematic Diagram of Catalog No. 220015-101.....................23

Figure 6A: Overall View of Catalog No. 220015.....................................25

Figure 6B: Panel View of Catalog No. 220015.........................................26

Figure 7: Testing in a Substation.................................................................31

Figure 8: Testing Parking Lot Lighting; the Test Set Shown is

Operating from an Inverter.......................................................32

Figure 9: Testing Transformer Terminals................................................33

Figure 10: DC Motor test setup................................................................. 34

Figure 11: Generator test setup..................................................................34

Figure 12: Regulation Curves with Stabilizer "out", 120V Supply,

-50 Option.................................................................................44

Figure 13: Typical Guard Connection to Cable Pothead........................45

Figure 14: Guard Connection for a Typical Cable Test..........................45

Figure 15: Typical Guard Connection for an Oil Circuit Breaker.........46

Figure 16: Typical Guard Connection for Transformer Test................46

Figure 17: Two-Winding Transformer in Three-Terminal Form..........50

Figure 18: Interior Views............................................................................70

Figure 19: Connections for Calibration of Voltmeter.............................71

Figure 20: Connections for Calibration of the Current Meter...............71

AVTM22-15Ja Rev. A May 2005

List of Tables

Table 1: Minimum Air Clearances..............................................................29

Table 2: Measurements of Resistance........................................................50

Table 3: Trouble Location............................................................................68

AVTM22-15Ja Rev. A May 2005

INTRODUCTION

This instruction manual is intended as a guide to the operation

and maintenance of the portable Dielectric Test Set, Megger

Catalog No. 220015 series.*References in this manual to

optional functions and equipment may be disregarded when

such information does not apply to the Test Set in use.

The instructions and suggestions provided in this manual

anticipate the normal use of the Dielectric Test Set for testing

electrical insulation systems on such equipment as motors,

generators, bushings and cables. These tests which are based

on measurement of the applied dc voltage, the resulting current

and the manner in which current varies with time, provide data

that indicate the condition of the insulation system of the unit

being tested. When these data are recorded on graph paper,

such as Megger Kilovolt-Megohm Paper (Part No. 220000),

the shape of the curve made by connecting the plotted points

will aid in evaluating the conditions of the insulation system.

Information on the interpretation of observed data and guides

for test voltage and time are given in Section 10 of this manual.

The basic available options covered by this manual are:

-42 Adjustable overcurrent trip setting on microammeter.

-43 Adjustable overvoltage trip setting on kilovoltmeter.

-47 Operation from input line voltage other than nominal

115 volts (Specify voltage from 100 to 240 volts).

-50 Internal voltage stabilization circuits to suppress input

transient voltages.

*This manual is intended for use with sets manufactured after

January 1985.

AVTM22-15Ja Rev. A May 2005

Figure a: The Megger Catalog No. 220015

DC Dielectric Test Set

AVTM22-15Ja Rev. A May 2005

SAFETY PRECAUTIONS

SAFETY IS THE RESPONSIBILITY OF THE USER

LA SEGURIDAD ES LA RESPONSABILIDAD DEL OPERADOR

The Test Set and the equipment to which it is connected are 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 test activities by

suitable barriers, barricades or warnings.

The Test Set panel 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 voltage charge on

nearby insulated objects, including people, all insulated objects

must be grounded or kept at least two feet (61 cm) from the

energized structure.

CAUTION!

Never connect theTest Set to energized

equipment or use theTest Setin an explosive

atmosphere.

All apparatus to be tested should be bonded to ground except

during the actual test. Note that even isolated conductors may develop

static voltage with respect to ground due to nearby electric fields, wind

friction or passing electrified clouds. Test connections should be

made with the ground bonds in place.

AVTM22-15Ja Rev. A May 2005

At the completion of a test, after the power source has been

shut down and the Test Set kilovoltmeter reads zero, all

energized parts of the test setup must be short-circuited by

means of a safety grounding stick (hot stick). Ground bonds

should then be applied to the equipment that was tested. These

bonds 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 in Sections 7and 8, and if all

grounds are correctly made, rubber gloves are not necessary.

As a routine safety procedure however, some users require that

rubber gloves be worn not only when making connections to

the high-voltage terminals, but also when manipulating

controls. Megger considers this an excellent safety practice.

Megger strongly recommends the general safety practices

contained in IEEE Std. 510 "IEEE Recommended Practices for

Safety in High-Voltage and High-Power Testing"as a guide for all

high-voltage testing. Do not, however, use this standard to

reduce any of the precautions given in this manual.

HEART PACEMAKERS

High-voltage discharges and other sources of strong electric or

magnetic fields may interfere with the proper functioning of

heart pacemakers. Personnel using heart pacemakers should

obtain expert advice on the possible risks before operating this

equipment or being close to the equipment during operation.

OTHER PRECAUTIONS

§Be especially careful when testing apparatus having high

capacitance such as cables. These items store a dangerous

charge, even at low voltage.

§Identify apparatus terminals and verify apparatus ground

prior to making connections.

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