Megger VLF Sinus 62 kV Bedienungsanleitung

VLF Sinus 62 kV

Portable Test and Diagnosis System

Operating instructions

Issue:

Item number:

B (10/2023) - EN

88099

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This document is copyright of Megger Germany GmbH.

The information in this document is subject to change without notice and should not be construed as a

commitment by Megger Germany GmbH. Megger Germany GmbH assumes no responsibility for any errors

that may appear in this document.

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Table of contents

1 Important notes 6

2 List of symbols and abbreviations 7

3 Safety instructions 8

4 Technical description 10

4.1 System description 10

4.2 Technical data 11

4.3 Scope of delivery and accessories 13

4.4 Display and operating elements 15

4.5 Connection elements 16

5 Commissioning 17

5.1 Electrical connection 17

5.1.1 Normal connection 18

5.1.2 Connection with automatic leakage current correction 19

5.1.3 Connection via separate cable drum 19

5.1.4 Connection in combination with a partial discharge measuring system 20

5.1.5 Connecting the external safety device (optional) 21

5.2 Switching on 21

6 Basic operation of the test system 22

6.1 Start screen and status bar 22

6.2 Basic rotary encoder controls 23

6.3 High-voltage control 25

7 Performing tests and diagnoses 27

7.1 Withstand voltage test 28

7.1.1 Preparing and starting the test 28

7.1.2 Procedure and conclusion of the test 32

7.2 Dissipation factor (TanDelta) measurement 35

7.2.1 Preparing and starting the TanDelta measurement 35

7.2.2 Procedure and conclusion of the TanDelta measurement 41

7.2.3 Analysing and evaluating the step test measurement results 44

7.3 Sheath test / Sheath fault location 46

7.3.1 Sheath testing 46

7.3.1.1 Preparing and starting the sheath test 46

7.3.1.2 Procedure and conclusion of the sheath test 48

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7.3.2 Sheath fault location 51

7.4 Partial discharge diagnostics (PD measuring system required) 55

8 Managing and processing measurement data 56

8.1 Managing and exporting measurement data 56

8.2 Archiving measurement data and creating a report 58

9 Adjusting the settings 59

9.1 Adjusting the software settings 59

9.2 Adjusting the measurement settings 60

9.3 Adjusting the extended settings 61

9.3.1 Activating the 'TanDelta measurement' option 62

9.3.2 Updating the firmware 62

9.3.3 Adjusting the tan delta settings 63

9.3.4 Managing tan delta evaluation standards 63

10 Switching off the test system and disconnecting it from the test object 65

11 Maintenance, storage and transport 66

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1 Important notes

Safety precautions

This manual contains basic information about commissioning and operating the device/system. Therefore,

it must be ensured that this manual is accessible to authorised and trained operating personnel at all times.

The operating personnel must read the manual carefully. The manufacturer will not accept liability for any

damage to persons or materials caused by a failure to observe the safety instructions contained in this

manual.

National standards and regulations must be observed.

Intended use

The safety of the supplied system is only guaranteed if it is used as intended. Improper use can result in

hazards for the operator, for the system, and for associated systems.

The limits specified in the technical data must not be exceeded under any circumstances.

Working with products from Megger

The generally valid electrical regulations of the country in which the device is installed and operated, as well

as the existing national regulations for accident prevention and any internal regulations (work, operating,

and safety regulations) of the operator must be observed.

After working on the system, it must be disconnected from the power supply and secured against being

switched on again, discharged, earthed, and short-circuited.

Original accessories are used for system safety and functional reliability. The use of other parts is not

permitted and leads to the loss of warranty.

Operating personnel

The system must only be commissioned and operated by authorised, qualified electricians. Under DIN VDE

0104 (EN 50191), DIN VDE 0105 (EN 50110) and accident prevention regulations, the term 'qualified

electrician' refers to persons who are able to identify hazards based on their knowledge, experience, and

knowledge of the relevant regulations.

Other persons must be kept away.

Declaration of Conformity (CE)

The product complies with the requirements of the following European directives:

nEMC Directive

nLow Voltage Directive

A digital copy of the CE Declaration of Conformity is available on request.

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2 List of symbols and abbreviations

Signal words and symbols used

The following signal words and symbols are used in this operating instructions and also on the product

itself:

Signal

word/symbol

Description

WARNING Indicates a potential hazard that may result in death or serious injury if not avoided.

CAUTION Indicates a potential hazard that may result in moderate or minor injuries if not avoided.

NOTE Indicates a potential hazard that may result in property damage if not avoided.

Used to highlight warning and safety instructions in the operating instructions.

When present as a sticker on the product, it identifies sources of danger that require

the user to read the operating instructions to ensure safe handling.

Used to highlight warning and safety instructions that explicitly indicate danger of

electric shock.

Used to highlight important information and useful tips for operating the product.

Failure to observe may result in unusable measurement results.

Indicates further information in other operating instructions.

List of abbreviations

Abbreviation Meaning

PDS Partial discharge measuring system

TD TanDelta (dissipation factor)

TDSTEP TanDelta – step test

TDMWT TanDelta – monitored withstand test

PD Partial discharge

VLF Very low frequency (0.1Hz alternating voltage)

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3 Safety instructions

Lifting and carrying devices

The device may only be lifted and carried using the carry handles provided on the side. Other parts of the

device, such as the connection cables, are unable to withstand the forces that occur when the device is

lifted and could therefore break or tear off.

Behaviour in the event of faults during normal operation

The system must only be operated if it is in perfect technical condition. In the event of damage, irregularity,

or faults that cannot be rectified using the instructions in the operating manual, the system must be immedi-

ately shut down and marked accordingly. In this case, notify the relevant supervisor. Please contact the

Megger service immediately to rectify the fault. The system must not be put back into operation until the

fault has been rectified.

Five safety rules

These five safety rules must be consistently applied when working on the electrical connection between

the measuring system and the test specimen.

1. Disconnect from the power supply

2. Secure it against being switched back on

3. Test to ensure that it has been disconnected

4. Earth and short-circuit the system

5. Cover or cordon off adjacent live components

Fire fighting in the vicinity of electrical equipment

nCorrect extinguishing agent: Carbon dioxide (CO2).

nCarbon dioxide is electrically non-conductive and leaves no residue. It is safe to

use on live systems but the appropriate safety distances must be observed. A CO2

fire extinguisher should therefore always be available near the electrical system.

nImproper use of other extinguishing agents may damage the electrical system, for

which Megger cannot accept any liability Furthermore, if a powder extinguisher is

used near high-voltage equipment, there is a risk of voltage being transferred to the

person using the fire extinguisher (due to the powder mist).

nPlease always observe the hazard warnings on fire extinguishers.

nDIN VDE 0132 applies.

Persons with pacemakers/defibrillators

Persons with pacemakers/defibrillators may be at risk in the vicinity of the device as a

result of the physical processes in the high-voltage system.

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WARNING

Risk of electric shock

Special attention and safety-conscious conduct is required by measuring personnel

when handling high-voltage equipment and systems, especially during non-stationary

operation. Here, VDE regulation 0104 "Erection and operation of electrical test

equipment" or the corresponding EN 50191 as well as country-specific standards and

regulations must be strictly observed.

nThe high-voltage device/system generates a dangerous voltage of up to

62kVPEAK.

nThe high-voltage device/system must not be operated unsupervised.

nWhen operating the high-voltage device/system, a second person must be in sight

and within hearing range, who can then recognise any dangers and activate the

emergency stop switches.

nSafety devices must not be bypassed or disabled.

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4 Technical description

4.1 System description

Purpose

The test system enables the standard testing of medium-voltage cables and other equipment with a real 0.1

Hz sinusoidal test voltage of up to 62 kVpeak or 44 kVrms.

This type of cable test can be used to safely induce the breakdown of installation faults that endanger

operation and insulation faults (such as water-tree damage in PE/VPE cables or local damage in mass-

impregnated cables). Thanks to the integrated breakdown detection, this test process is performed without

any damage to the fault-free cable insulation.

Furthermore, the system is also suitable for tests with…

npositive and negative DC voltage of up to 62 kV,

ntrapezoidal AC voltage (square-wave voltage) of up to 62 kVpeak with load-dependent ramp speed,

In addition, the optional internal tan delta measurement offers the option to determine the dielectric loss

factor tanδ (tan delta) during a step test with sinusoidal test voltage, and thus a measure of the cable's

degree of ageing.

In combination with a suitable partial discharge measuring system and a notebook for controlling the

software, the test system can also be used for standard measurement of partial discharges (PD).

Features

The test system combines the following features and functions into one system:

nAC voltage test with two different voltage forms

nDC voltage test with positive and negative polarity

nComplete tan delta step test

nInformative dielectric strength diagnostics (VLF test with accompanying tan delta diagnostics)

nLeakage current measurement at DC and square-wave voltage

nSheath test and sheath fault pinpointing with negative DC voltage of up to 20 kV

nManual and automatic frequency adjustment

nBreakdown detection with automatic switch-off of the test voltage and discharge of the test object in

the event of excessive charging current

nSwitchable burning function for fault conversion after breakdown (max. one minute)

nAutomatic evaluation of tan delta measured values based on official and in-house standards

nConvenient measurement data export via USB (prepared for wireless data transfer) for reporting and

archiving in the reporting software MeggerBook Lite or MeggerBook

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