Megger VLF Sinus Manuale utente

VLF Sinus 34 kV

VLF Test System

USER GUIDE

Issue: A (05/2022) - EN

Article number: 128312971

Consultation with Megger

The present system manual has been designed as an operating guide and for reference. It is meant to answer your

questions and solve your problems in as fast and easy a way as possible. Please start with referring to this manual

should any trouble occur.

In doing so, make use of the table of contents and read the relevant paragraph with great attention. Furthermore,

check all terminals and connections of the instruments involved.

Should any question remain unanswered, please contact:

Megger Limited Megger Germany GmbH (Baunach)

Archcliffe Road

Kent CT17 9EN

T: +44 1304 502100

F: +44 1304 207342

E: uksales@megger.com

Dr.-Herbert-Iann-Str. 6

D - 96148 Baunach

T: +49 9544 68 – 0

F: +49 9544 22 73

E: team.dach@megger.com

Megger Germany GmbH (Radeburg) Megger USA

Röderaue 41

D - 01471 Radeburg / Dresden

T: +49 35208 84 – 0

F: +49 35208 84 249

E: team.dach@megger.com

Valley Forge Corporate Centre

2621 Van Buren Avenue

Norristown, PA 19403 USA

T: +1 610 676 8500

F: +1 610 676 8610

Megger

declared their consent in writing. The content of this handbook is subject to change without notice. Megger cannot be made

liable for technical or printing errors or shortcomings of this handbook. Megger also disclaim all responsibility

for damage resulting directly or indirectly from the delivery, supply, or use of this matter.

Terms of Warranty

Megger accept responsibility for a claim under warranty brought forward by a customer for a product sold by

Megger under the terms stated below.

Megger warrant that at the time of delivery Megger products are free from manufacturing or material defects which

might considerably reduce their value or usability. This warranty does not apply to faults in the software supplied.

During the period of warranty, Megger agree to repair faulty parts or replace them with new parts or parts as new

(with the same usability and life as new parts) according to their choice.

Megger reject all further claims under warranty, in particular those from consequential damage. Each component

and product replaced in accordance with this warranty becomes the property of Megger.

All warranty claims versus Megger are hereby limited to a period of 12 months from the date of delivery. Each

component supplied by Megger within the context of warranty will also be covered by this warranty for the

remaining period of time but for 90 days at least.

Each measure to remedy a claim under warranty shall exclusively be carried out by Megger or an authorized

service station.

To register a claim under the provisions of this warranty, the customer has to complain about the defect, in case of

an immediately detectable fault within 10 days from the date of delivery.

This warranty does not apply to any fault or damage caused by exposing a product to conditions not in accordance

with this specification, by storing, transporting, or using it improperly, or having it serviced or installed by a

workshop not authorized by Megger. All responsibility is disclaimed for damage due to wear, will of God, or

connection to foreign components.

For damage resulting from a violation of their duty to repair or re-supply items, Megger can be made liable only in

case of severe negligence or intention. Any liability for slight negligence is disclaimed.

Contents

1Safety Advices............................................................................................................... 6

1.1 General Notes ............................................................................................................................6

1.2 General Cautions and Warnings................................................................................................. 7

2Technical Description................................................................................................... 9

2.1 General Description.................................................................................................................... 9

2.2 Technical Data ......................................................................................................................... 10

2.3 Testable Cable Capacities........................................................................................................ 11

2.4 Connectors and Controls.......................................................................................................... 12

3Setting Up the System ................................................................................................ 13

3.1 Electrical Connection................................................................................................................ 13

3.2 Switching On the System ......................................................................................................... 15

4Stand-Alone Operation ............................................................................................... 16

4.1 Basics of Operation .................................................................................................................. 16

4.2 Safety Measures ...................................................................................................................... 17

4.3 Settings .................................................................................................................................... 18

4.3.1 Device Settings ........................................................................................................................ 19

4.3.2 Changing the Test Settings ...................................................................................................... 20

4.4 Testing / Pinpointing................................................................................................................. 22

5Remote Control ........................................................................................................... 27

6Completing the Test.................................................................................................... 27

7Further Processing of the Log Data .......................................................................... 28

8Repair and Maintenance ............................................................................................. 29

1 Safety Advices

1.1 General Notes

Safety precautions

This manual contains basic instructions on commissioning and operating the

VLF Sinus 34 kV. For this reason, it is important to ensure that the manual is available at

all times to authorised and trained personnel. Any personnel who will be using the devices

should read the manual thoroughly. The manufacturer will not be held liable for any injury

or damage to personnel or property through failure to observe the safety precautions

contained in this handbook.

Locally applying regulations have to be observed.

Labelling of safety

instructions

Important instructions concerning personal, operational and technical safety are marked in

the text as follows:

Symbol Description

WARNING

Indicates a potential danger that may lead to fatal or serious injury.

CAUTION

Indicates a potentially hazardous situation which, if not avoided, may

result in minor or moderate injury or material damage.

The notes contain important information and useful tips for using the

system. Failure to observe them can render the measuring results

useless.

Working with products

from Megger

It is important to observe the general electrical regulations of the country in which the

device will be installed and operated, as well as the current national accident prevention

regulations and internal company rules (work, operating and safety regulations).

Use genuine accessories to ensure system safety and reliable operation. The use of other

parts is not permitted and invalidates the warranty.

Operating staff This system and its peripheral equipment may only be operated by trained or instructed

personnel. Anyone else must be kept away.

The system may only be installed by an authorised electrician. DIN VDE 0104 (EN 50191),

DIN VDE 0105 (EN 50110) and the German accident prevention regulations (UVV) define

an electrician as someone whose knowledge, experience and familiarity with the

applicable regulations enables him to recognise potential hazards.

1.2 General Cautions and Warnings

Intended application Safe operation is only realised when using the equipment for its intended purpose (see

chapter 2.1). Usi

ng the equipment for other purposes may lead to human danger and

damage of equipment of involved installations.

The limits described under technical data may not be exceeded. Operating products of

Megger in condensing environment may lead to flash-over, d

anger and damage. The

instruments should only be operated under tempered conditions. It is not allowed to

operate Megger

products at direct contact with humidity, water or near aggressive

chemicals nor explosive gases and fumes.

Five safety rules

The five safety rules must always be followed when working with HV (High Voltage):

1. De-energise

2. Protect against re-energising

3. Confirm absence of voltage

4. Ground and short-circuit

5. Cover up or bar-off neighbouring energised parts

Using cardiac pacemaker

Physical processes during operation of high voltage may endanger persons wearing a

cardiac pacemaker when near these high voltage facilities.

Fire fighting in electrical installations

•According to regulations, carbon dioxide (CO2) is required to be used as

extinguishing agent for fighting fire in electrical installations.

•Carbon dioxide is electrically non conductive and does not leave residues. It is safe to

be used in energized facilities as long as the minimum distances are maintained. A

CO2fire extinguisher must be always available within electrical installations.

•If, contrary to the regulations, any other extinguishing agent is used for fire fighting,

this may lead to damage at the electrical installation. Megger disclaims any liability for

consequential damage. Furthermore, when using a powder extinguisher near high-

voltage installations, there is a danger that the operator of the fire extinguisher will get

an electrical shock from a voltage arc-over (due to the powder dust created).

•It is essential to observe the safety instruction on the extinguishing agent.

•Applicable is DIN VDE 0132.

WARNING

Dangers when operating with HV

Special attention and safety-

conscious behaviour is needed when operating HV

facilities and especially non-stationary equipment. The regulations VDE 0104 about

setting up and operation of electric test equipment, i.e. the corresponding EN 50191

as well as country-specific regulations and standards must be observed.

•The VLF Sinus 34 kV generates a dangerous voltage of up to ±24 kVRMS during

testing. This is supplied via a HV cable to the test object.

•The test system may not be operated without supervision.

•Operation requires minimum two people whereas the second person must be

able to activate the emergency switch in case of danger.

•Safety installations may not be by-passed nor deactivated.

•To avoid hazardous electric charges of metallic parts in the vicinity, all metallic

parts must be grounded.

•Check whether there are any unsecured live systems or components in the im-

mediate vicinity of the test system which might you or the system might

accidentally come into contact with. This particularly applies to components

which carry high voltage or where the voltage is unknown.

Secure these components using insulating covers. If technical reasons make it

impossible to do this, switch them off or have this action carried out at the site for

the duration of your work after consulting whoever is responsible. Make sure this

is done properly.

2 Technical Description

2.1 General Description

Functional description The VLF Sinus test system enables testing of medium-voltage cables in accordance with

the CENELEC Harmonization Documents HD 620 S1:1996 und HD 621 S1:1996 with a

0.1 Hz sine wave voltage of up to 24 kVRMS.

With the aid of such cable testing, faults in the insulation - particularly water tree damage -

will be reliably made to flash over in PE/XLPE cables but also in paper insulated cables.

The test procedure does not damage fault-free insulation.

The cables can also be tested for dielectric breakdown strength with positive and negative

DC voltage, as well as with trapezoidal AC voltage (rectangular wave voltage).

The slew rate of the rectangular wave voltage depends on the cable capacitance and is

automatically adapted.

The additional leakage current measurement

in DC mode enables evaluation of the

relative quality of the cable insulation.

The sine-wave shape of the system test voltage can also be used in combination with the

tan Delta test attachment from Megger to determine the loss factor and thus the cable's

degree of deterioration. A detailed description of this use can be found in the operating

manual of the tan Delta test attachment.

Features The VLF Sinus test system unites the following features and functions in a single device:

•Full AC voltage testing up to 24 kVRMS (sine wave voltage)

•Additional output voltage shapes of DC and rectangular wave

•Sheath testing and pinpointing up to 10 kV

•Leakage current measurement

•Manual and automatic frequency adjustment

•Voltage breakdown detection with automatic disconnection of the high voltage

•Logging to USB

•Firmware updates via USB

Scope of delivery The scope of delivery of the test system comprises the following components:

•Trolley bag with extendable handle

•Mains power cable, 2.5 m

•Earthing cable, 4 m

•HV connection cable, 5 m

•USB stick

•Operating manual

•Accessory bag

2.2 Technical Data

The VLF Sinus 34 kV test system is defined by the following technical parameters:

Parameter Value

Output voltage (sine wave)

Testing

Loss factor measurement with

the tan Delta test attachment

max. 24 kVRMS (33.9 kVPEAK)

max. 21,2 kVRMS (30 kVPEAK)

Source output current 8.8 mARMS (12.45 mAPEAK)

Leakage current measurement 0 … 14 mA

Frequency 0.01 Hz … 0.1 Hz

(automatic or settable in 0.01 Hz increments)

Testable cable capacitance

24 kVRMS at 0.01 Hz

24 kVRMS at 0.1 Hz

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