Megger T22/13B Manuel utilisateur

T 22/13 B

15 kV Burn Unit

USER GUIDE

Issue: A (04/2023) - EN

Article number: 128311145

Consultation with Megger

The present user guide 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 user guide 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 or should you need the help of an authorized

service station, please contact:

Megger Limited Megger Germany GmbH (Baunach)

Archcliffe Road

Kent CT17 9EN

T: +44 (0) 1304 502100

F: +44 (0)1 304 207342

E: [email protected]

Dr.-Herbert-Iann-Str. 6

D - 96148 Baunach

T: +49 / 9544 / 68 – 0

F: +49 / 9544 / 22 73

E: [email protected]

Megger Germany GmbH (Radeburg) Megger GmbH

Röderaue 41

D - 01471 Radeburg / Dresden

T: +49 / 35208 / 84 – 0

F: +49 / 35208 / 84 249

E: [email protected]

Obere Zeil 2

61440 Oberursel

T: 06171-92987-0

F: 06171-92987-19

E: [email protected]

Megger

have before-hand declared their consent in writing. The information in this document is subject to change without

notice and should not be construed as a commitment by Megger. Megger cannot be made liable for technical or

printing errors or shortcomings of this user guide. Megger also disclaims 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.

This warranty does not cover wear parts, lamps, fuses, batteries and accumulators.

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.

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, force majeure 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.

Since some states do not allow the exclusion or limitation of an implied warranty or of

consequential damage, the limitations of liability described above perhaps may not apply

to you.

Contents

Consultation with Megger...............................................................................................3

Terms of Warranty ...........................................................................................................4

Contents ...........................................................................................................................5

1Safety Instructions ...........................................................................................6

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

1.2General Safety Instructions and Warnings.........................................................7

2Technical description ......................................................................................9

2.1System description .............................................................................................9

2.2Technical Data .................................................................................................11

2.3Display and operating elements.......................................................................12

2.4Connection elements........................................................................................13

3Commissioning ..............................................................................................14

3.1Electrical connection ........................................................................................15

4Performing measurements............................................................................18

4.1Conversion of fault resistance (Burning) ..........................................................18

4.2Perform sheath fault location............................................................................20

5Disconnecting the device from the test object ...........................................21

6Troubleshooting .............................................................................................22

7Storage, cleaning and maintenance.............................................................23

1Safety Instructions

1.1 General Notes

This user guide contains basic instructions for the commissioning and operation of the

device / system. For this reason, it is important to ensure that the user guide is always

available to the authorised and trained operator. They need to read the manual

thoroughly. The manufacturer is not liable for damage to material or humans due to non-

observance of the instructions and safety advices provided by this user guide.

Locally applying regulations have to be observed!

The following signal words and symbols are used in this user guide and on the product

itself:

Signal word /

symbol

Description

DANGER Indicates a potential hazard which will result in death or serious

injury if not avoided.

WARNING Indicates a potential hazard which may result in death or serious

injury if not avoided.

CAUTION Indicates a potential hazard which may result in moderate or

minor injury if not avoided.

NOTICE Indicates a potential hazard which may result in material damage

if not avoided.

Serves to highlight warnings and safety instructions.

As a warning label on the product it is used to draw attention to

potential hazards which have to be avoided by reading the user

guide.

Serves to highlight warnings and safety instructions that explicitly

indicate the risk of an electric shock.

Serves to highlight important information and useful tips on the

operation of the device/system. Failure to observe may lead to

unusable measurement results.

It is important to observe the generally applicable 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 directives (work, operating and safety

regulations).

After working on the system, it must be voltage-free and secured against reconnection as

well as having been discharged, earthed and short-circuited.

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

parts is not permitted and invalidates the warranty.

Safety precautions

Labelling of safety

instructions

Working with products

from Megger

The system may only be installed and operated 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 them to recognise potential hazards.

Anyone else must be kept away!

The product meets the following security requirements of the European Council

Directives:

EMV Directive (2014/30/EC)

Low Voltage Directive (2014/35/EC)

RoHS Directive (2011/65/EU)

1.2 General Safety Instructions and Warnings

The operational safety is only guaranteed if the delivered system is used as intended (see

page 9). Incorrect use may result in danger to the operator, to the system and the

connected equipment.

The thresholds listed in the technical data may not be exceeded under any circumstances.

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. Earth and short-circuit

5. Cover up or bar-off neighbouring energised parts

Using cardiac pacemaker / defibrillator

Physical processes during operation of high voltage may endanger

persons wearing a cardiac pacemaker or defibrillator when near these

high voltage facilities.

Operating staff

Declaration of

Conformity (CE)

Intended application

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 firefighting, this can lead to damage to 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

flashover (due to the powder mist that occurs).

It is essential to observe the safety instruction on the

extinguishing agent.

Applicable is DIN VDE 0132.

WARNING

Dangers when working with high voltage

Working on high voltage systems and equipment – especially in non-

stationary operation – requires particular care and safety-conscious

action on the part of test personnel. VDE regulations 0104 on setting up

and operating electrical test systems, as well as EN 50191 and national

standards and regulations must be strictly adhered to.

The Burn Unit generates a dangerous voltage of up to 15 kV during

measurement operation. This is supplied to the test object via a high-

voltage cable.

The test system may not be operated without supervision.

Safety equipment must not be circumvented or put out of service.

Operation requires a minimum of two persons whereas the second

person must be able to activate the emergency switch in case of

danger.

To prevent dangerous charge accumulation, earth all metal parts in

the vicinity of the high voltage equipment.

2Technical description

2.1 System description

The powerful T 22/13 B 15 kV Burn Unit is mostly used for the conversion of high

resistance and intermittent cable faults into low resistance shunts.

This process known as „Burning“ uses the heat of an electric arc to turn the hydrocarbons

of the cable insulation at a fault point into conductive carbon. The fault resistance changes

to low-impedance values, allowing it to be used for pre-location using the pulse reflection

method and pinpointing using the twist method and the distortion-of-minimum method.

In addition to this classical application as a Burn Unit, the following methods are also

available for the T 22/13 B in combination with other devices:

Pre-location using the arc reflection method (ARM Live Burning) in combination

with a suitable coupling unit and a time domain reflectometer (TDR)

Sheath pinpointing in combination with a suitable ground fault detector

The T 22/13 B 15 kV Burn Unit is short-circuit proof and supplies constant power to the

changing fault resistance over a range of currents (constant power characteristics). The

burn-out voltage is infinitely variable. Output current and output voltage are displayed on

instruments, each with a choice of two measuring ranges. The maximum burn-out peak

current is 31 A.

A start preconditioning circuit and a discharge device are built in for safety.

The unit uses a 50 Hz high-voltage transformer which takes its primary supply from a

regulating transformer. The burn-out or charging current reaches the output via a bridge

rectifier.

In the case of low-impedance faults or operation using an energy separation filter (ESF)

the spark gap is opened and the charged capacitor is discharged into the output circuit

in relaxation oscillations, with a choke and recovery diodes providing power adjustment

to the fault. This allows the T 22/13 B 15 kV Burn Unit to achieve virtually constant

power characteristics.

In the case of very low external resistances, e.g. < 5 , overload protection prevents the

recovery diodes from overheating. The HV transformer is also protected against

overloading.

The T 22/13 B is provided by Megger either as a portable stand-alone device or as an

integrated part of a measuring system (preferably in a test van or on a pallet). While the

stand-alone device can be used completely autonomously according to the description in

this user guide and is equipped with all necessary safety devices, dependencies and

security mechanisms have to be observed when used in combination with other devices,

which can be found in the documentation of the respective measuring systems.

Application

Functional description

Product versions

The scope of delivery of the stand-alone device includes the following components:

Component Item number

Burn Unit 892477610

High-Voltage connecting cable, 2,5 m 893020630

Earthing cable, 2,5 m 893020641

Power cord, 4 m 893020631

Earth clamp 892480646

Earth connection clamp 893020642

User guide 128311145

Check the contents of the package for completeness and visible damage right after

receipt. In the case of visible damage, the device must under no circumstances be taken

into operation. If something is missing or damaged, please contact your local sales

representative.

Scope of delivery

Check contents

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