Megger Vidar Manuale utente

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User’s Manual

VIDAR

Vacuum tester

Art No. ZP-BR01E Doc. BR0150GE V02a 2015

Contents

1 Safety

............................................................. 4

1.1 Symbols on the instrument ..........................4

1.2 Safety instructions........................................4

2 Introduction

............................................................. 6

2.1 General........................................................6

2.2 Flashover threshold voltage..........................6

3 Instrument description

............................................................. 8

4 Operating instructions

........................................................... 10

4.1 Connecting................................................10

4.2 Conducting a test ......................................10

5 Troubleshooting

........................................................... 12

6 Speciﬁcations

........................................................... 14

VIDAR

Vacuum tester

NOTICE OF COPYRIGHT & PROPRIETARY RIGHTS

The contents of this manual are the property of Megger Sweden AB. No part of this work may be reproduced or transmitted in any form or

by any means, except as permitted in written license agreement with Megger Sweden AB. Megger Sweden AB has made every reasonable

attempt to ensure the completeness and accuracy of this document. However, the information contained in this manual is subject to change

without notice, and does not represent a commitment on the part of Megger Sweden AB. Any attached hardware schematics and technical

descriptions, or software listings that disclose source code, are for informational purposes only. Reproduction in whole or in part to create

working hardware or software for other than Megger Sweden AB products is strictly prohibited, except as permitted by written license

agreement with Megger Sweden AB.

TRADEMARK NOTICES

Megger® and Programma® are trademarks registered in the U.S. and other countries. All other brand and product names mentioned in this

document are trademarks or registered trademarks of their respective companies.

Megger Sweden AB is certiﬁed according to ISO 9001 and 14001.

User’s Manual

Postal address:

Megger Sweden AB

Box 724

SE-182 17 DANDERYD

SWEDEN

T +46 8 510 195 00

F +46 8 510 195 95

seinfo@megger.com

www.megger.com

Visiting address:

Megger Sweden AB

Rinkebyvägen 19

SE-182 36 DANDERYD

SWEDEN

BR0150GE ZP-BR01E VIDAR 3

4VIDAR ZP-BR01E BR0150GE

1 SAFETY

1Safety

1.1 Symbols on the

instrument

Caution, refer to accompanying docu-

ments.

Protective conductor terminal.

WEEE, Waste Electrical and Electronic

Equipment. Please utilize your local

WEEE collection facilities in the dispo-

sition of this product and otherwise

observe all applicable requirements.

1.2 Safety instructions

Important

Read and comply with the following in-

structions.

Always comply with local safety regula-

tions.

Warning

People with pacemakers must not use the VIDAR

since a pacemaker can be disturbed by the electrical

discharges.

When testing a circuit breaker that is permanently

mounted you must make certain that there is no risk

of burning out the collector busbar if it can not be

disconnected.

Circuit breakers on vehicles and also circuit break-

ers of the plug-in type must be tested outside their

holders.

Applying abnormally high voltage across a pair of

contacts in vacuum may be dangerous. However, as

a precautionary measure against possibility of ap-

plication of higher than recommended voltage (or a

contact spacing below normal), it is recommended

that all operating personnel stands at least 3 m

(10 ft) away in front of the breaker.

High voltage/current on input/output terminals.

Do not attempt to service the instrument yourself.

Opening or removing covers may expose you to dan-

gerous voltage. If you attempt to service the instru-

ment yourself the warranty is no longer valid.

Do not use any accessories that are not intended for

use together with the instrument.

Disconnect the instrument from the mains before

cleaning. Use a damp cloth for cleaning. Do not use

liquid cleaners or aerosol cleaners.

Important

BR0150GE ZP-BR01E VIDAR 5

1 SAFETY

Always turn the equipment off before connecting.

Always use manufacturer approved and supplied

cable sets.

Always connect protective earth (ground).

Never leave the instrument unattended while it is

turned on.

Use only approved mains detachable cable set with

the instrument. Main supply cables shall be rated

for the maximum current for the equipment and the

cable shall meet the requirements of IEC 60227 or

IEC 60245. Mains supply cables certiﬁed or approved

by a recognized testing authority are regarded as

meeting this requirement.

Unplug the instrument from the mains supply when

it is left unattended or not in use.

Do not expose the instrument to rain or moisture.

Refer all servicing to Megger authorized personnel.

If you need to return the instrument, please use

either the original crate or one of equivalent strength

6VIDAR ZP-BR01E BR0150GE

2 INTRODUCTION

2Introduction

2.1 General

The VIDAR vacuum tester is used to test the ability of

the breaking chamber in a vacuum circuit breaker to

inhibit ﬂashover. The rugged, lightweight, compact

and portable VIDAR is ideal for ﬁeld work.

The vacuum bottles in vacuum breakers do not last

forever. Leakage starts after years or decades and the

bottles ﬁll with air making the breaker unreliable. In

most cases the leakage process is rapid once it has

started. In addition to leakage, dirt on the poles and

on the exterior surface of the bottle can make it un-

safe during operation. The mechanics of the breaker

can become misaligned so that the distance between

the poles no longer is adequate. Vidar, introduced in

1985, uses high voltage DC to test the integrity of

vacuum breakers. There are some 2000 units of Vidar

in ﬁeld service all over the world that perform daily

tests on the integrity of vacuum breakers.

2.2 Flashover threshold

voltage

The curve shown in Fig. 1 illustrates the relationship

between a vacuum chamber’s internal pressure and

its ability to inhibit ﬂashover. This relationship permits

the vacuum to be checked indirectly by measuring

the voltage threshold. One special advantage of this

method is that you do not need to disassemble the

circuit breaker in order to test it.

The voltage shall be selected so that test point A (see

diagram) is sufﬁciently far from point B (when the

chamber is ﬁlled with air). However the electric stress in

the chamber must not be too high. In normal situations

the pressure is less than 10-2 mbar.

For guidance on test voltage refer to IEC 694 and

ANSI C37-06 standards.

p ~10 mbar

-2 po

log p

log Ud

Fig. I. Flashover threshold voltage plotted against pressure in

vacuum chamber.

p : chamber pressure

po: atmos. pressure

pp: max. pressure on passing voltage test

ud: breakdown voltage

up: test voltage

BR0150GE ZP-BR01E VIDAR 7

3 INSTRUMENT DESCRIPTION

8VIDAR ZP-BR01E BR0150GE

3 INSTRUMENT DESCRIPTION

3Instrument description

1. High voltage cable. For connection of the test voltage

and ground to the vacuum breaking chamber.

2. Yellow CANCEL indicator lamp. Lights up when:

▪the test interval has exceeded one minute.

▪you try to conduct a one minute test less than two

minutes after the latest test.

▪the HIGH-VOLTAGE indicator malfunctions.

3. Red HIGH-VOLTAGE warning lamp. Shows that the

high voltage is applied.

4. Test voltage selector. Five standard voltages and one

customized voltage, determined at the factory.

5. Protective earth (ground) terminal.

6. SAFETY CONTROL KNOBS. Both knobs must be

turned simultaneously to their TEST positions to apply

high voltage to the object being tested.

7. Green ACCEPTABLE Indicator lamp. Lights up when

the breaking chamber test result is positive.

8. Power ON/OFF.

9. Red DEFECTIVE indicator lamp. Lights up when:

▪the breaking chamber test result is negative

▪the ﬂashover threshold voltage is too low.

1 4 5

6976

BR0150GE ZP-BR01E VIDAR 9

4 OPERATING INSTRUCTIONS

10 VIDAR ZP-BR01E BR0150GE

4 OPERATING INSTRUCTIONS

4Operating instructions

4.1 Connecting

Important

Read the manual and comply with the

Safety instructions, see page 4, before us-

ing VIDAR.

Always comply with local safety regula-

tions.

1] Check that the circuit breaker is in OPEN

position.

2] Check that the master ON/OFF switch on the

VIDAR is in OFF position and that the red

HIGH-VOLTAGE warning lamp is not ﬂashing.

3] Connect the protective earth (ground) cable

from VIDAR to the station earth (ground).

4] Connect the part with the black crocodile

clamp of the high-voltage cable to the con-

trol mechanism side of the breaking cham-

ber.

5] Connect the part with the red crocodile

clamp of the high-voltage cable to the other

terminal on the breaking chamber.

6] Connect VIDAR to the mains power.

4.2 Conducting a test

Note For guidance on test voltage refer to IEC 694

and ANSI C37-06 standards.

1] Connect the VIDAR as instructed in section

4.1 Connecting.

2] Select the desired test voltage depending on

the type of breaking chamber being tested.

3] Turn the power ON/OFF switch to the ON

position. The green lamp beside the switch

will light up.

4] Using both hands, turn the two SAFETY

CONTROL knobs to their respective end limits

in the directions shown by the two arrows on

the control panel. Wait until either the green

ACCEPTABLE indicator lamp or the red DE-

FECTIVE indicator lamp lights up and remains

lighted throughout at least ﬁve seconds.

While the test is in progress, the red HIGH

VOLTAGE warning lamp will ﬂash. If the red

HIGH VOLTAGE warning lamp is faulty, the

yellow CANCEL indicator lamp will light up.

a. If the green ACCEPTABLE lamp lights up

and remains lighted for at least ﬁve seconds

the test is complete and the breaking cham-

ber can be considered in good condition.

Release the SAFETY CONTROL KNOBS.

b. If the red DEFECTIVE lamp lights up and

remains lighted for at least ﬁve seconds,

release the SAFETY CONTROL knobs

Turn off the power and check the ground

connection and other connections. Start

again from point 3.

If the red DEFECTIVE lamp lights up again,

disconnect VIDAR from the breaking cham-

ber (see below section “Disconnection after

test”). Repeat the test with reversed polarity

in order to eliminate false DEFECTIVE indica-

tion due to ﬁeld emission.

Note Any metallic discharge sounds that are heard

during the test are of no importance. The

results shall be based solely on the lighting up

of either the green ACCEPTABLE lamp or the

red DEFECTIVE lamp.

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