Megger Tan Delta Test Attachment Manuale utente

Mess- und Ortungstechnik

Measuring and Locating Technologies

Leitungsortung

Line Locating

Rohrleitungsnetze

Water Networks

Kommunikationsnetze

Communication Networks

Elektrizitätsnetze

Power Networks

Issue: 7 (08/2015) – EN

128311098

Operating Instructions

tan Delta Test Attachment

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 or should you need the help of an authorized service station, please

contact:

Megger Limited Seba Dynatronic

Mess- und Ortungstechnik GmbH

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: sales@sebakmt.com

Hagenuk KMT

Kabelmesstechnik GmbH

Megger USA

Röderaue 41

D - 01471 Radeburg / Dresden

T: +49 35208 84 – 0

F: +49 35208 84 249

E: sales@sebakmt.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 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, 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.

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

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

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

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

2Technical Description......................................................................................................... 8

2.1 Technical Priciples................................................................................................................... 8

2.2 Technical Data......................................................................................................................... 9

2.3 System Description................................................................................................................ 10

2.3.1 Scope of Delivery and Accessories.............................................................................. 11

2.3.2 Measurement Data Unit (MDU).................................................................................... 12

2.3.3 Termination Current Unit (TCU) ................................................................................... 13

3Setting Up the System ...................................................................................................... 14

3.1 Connecting the DRU or DRU-1 .............................................................................................. 14

3.2 Power Supply......................................................................................................................... 15

3.3 Electrical Connection ............................................................................................................. 16

3.3.1 Electrical Connection for Measurements without Leakage Current Compensation ...... 18

3.3.2 Electrical Connection for Measurements with Leakage Current Compensation ........... 20

3.4 Starting Up the Test Attachment and the Test Voltage Source.............................................. 22

4Performing Measurements............................................................................................... 23

5Concluding the Measurement.......................................................................................... 24

6Connection examples....................................................................................................... 25

1 Safety Advices

1.1 General Notes

Safety precautions This manual contains basic instructions on commissioning and operating the tan Delta

test attachment. 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.

Repair and maintenance Repairs and service must only be done by Megger or authorised service departments

of Megger. Megger recommends having the equipment serviced and checked once

per year at a Megger service location.

Megger also offers direct on-site support. Please contact our service office for more

information.

1.2 General Cautions and Warnings

Intended application The tan Delta test attachment can be used to measure the loss factor tanδ of cables

and transformers (see section 2.3).

Using 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.

Behaviour at malfunction

of normal operation

The equipment may only be used when working properly. When irregularities or

malfunctions appear that cannot be solved consulting this manual, the equipment

must immediately be put out of operation and marked as not functional. In this case

inform the person in charge who should inform the Megger service to resolve the

problem. The instrument may only be operated when the malfunction is resolved.

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 CO2 fire 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.

2 Technical Description

2.1 Technical Priciples

Requirement Underground medium and high voltage cables are continuously subject to thermal,

electrical and mechanical stresses over the course of their use.

This fact inevitably leads - despite the use of durable materials - to increasing damage

or ageing of the cable, which in turn leads to dielectric losses.

One measure for these dielectric losses is the loss factor tanδ.

To prevent cable faults or detect cables with critical ageing, the measurement of tanδ is

a useful diagnostic method.

Physical background The dielectric losses are primarily determined by the conductivity losses in the cable

insulation. With mass-impregnated paper insulation cables, polarisation losses likewise

influence the loss factor.

The dielectric losses (tanδ) can be calculated as follows:

Shown as a vector diagram, this gives the following picture:

Put simply, the insulation resistance is inversely proportional to the tanδ. With a rising

proportion of active current IRan increase is consequently also seen in the tanδ.

Typical indicators of

aged cables

The most important age indicator for mass-impregnated paper insulation cables is

the decomposition of cellulose, which, in principle, acts to increase the moisture in the

paper insulation (through thermal and chemical processes). The moisture decreases

the insulation resistance and thus raises the cable insulation's loss factor tanδ.

Water that has penetrated the insulation from outside also has a considerable

influence on the loss factor.

For VPE cables, the absolute value of the loss factor is less decisive than the change

of the tanδ with increasing voltage (Δtanδ or “tip-up”). The dielectric properties of water

in water trees do not behave in a linear manner with increasing voltage and are thus

detectable using appropriate diagnostic methods.

Water trees are the most frequent age indicator for polymer cables and can definitely

lead to abrupt cable failures.

RCI

tan ==

2.2 Technical Data

The tan Delta test attachment is defined by the following parameters:

Parameter Value

Measuring range, tanδ 1 x 10-4 ... 1 x 100

Measuring accuracy 1 x 10-4

Resolution 1 x 10-5

Frequency 0.01 Hz … 1 Hz

(10 Hz with accuracy limitations)

Testable cable capacitance 2 nF ... 3 μF

(10 m … 15 km VPE cable for example)

Maximum voltage 54 kVPEAK

Measuring range, current

Measurement Data Unit (MDU)

Termination Current Unit (TCU)

1 μA .. 25 mA

1 μA .. 1 mA

Measuring range, insulation

resistance

1 MΩ … 10 TΩ

Power supply

MDU / TCU

Charger

battery-operated

90 V ... 240 V, 50/60 Hz AC (via power cable) or

12 VDC (via optional vehicle charging cable)

Operating time

Measurement Data Unit (MDU)

Termination Current Unit (TCU)

16 hours (for operation with TCU)

32 hours (for operation without TCU)

24 hours

Charging time 3.5 h

Interfaces

Measurement Data Unit (MDU)

Termination Current Unit (TCU)

Data Reception Unit (DRU)

optical interface (TOSLINK),

wireless connection (868/915 MHz)

optical interface (TOSLINK)

connection to PC via USB (DRU)

or Ethernet (DRU-1) connection to MDU via

radio link (868/915 MHz)

Operating temperature range -25 °C...+55 °C

Operating humidity +30 °C, 70 % relative humidity

Storage temperature range -40 °C...+70 °C

Weight

Measurement Data Unit (MDU)

Termination Current Unit (TCU)

System with case, tripod,

accessories and cables

2.6 kg

1.6 kg

12.25 kg

Protection rating

MDU, TCU, tripod

case (closed)

case (open)

(in accordance with IEC 60529)

IP52

IP62

IP30

2.3 System Description

Area of application Dielectric losses can be measured on cables with XLPE (Cross Linked Polyethylene),

PE (Polyethylene), PILC (Paper Insulated Lead Covered) and EPR (Ethylene-

Propylene Rubber) insulation.

The measurement results for mixed sections can only be conditionally interpreted. It is

possible, for example, to diagnose a PILC cable section with a small proportion of

XLPE cable (e.g. about 10%) according to the criteria for a regular mass impregnated

cable.

However, a XLPE/PE cable section with a certain proportion of PILC cable cannot be

evaluated according to the known criteria for XLPE/PE insulation. This is due to the fact

that measurements on even fault-free mass PILC cables show a considerably higher

dielectric loss factor.

Prerequisites In order to use the tan Delta test attachment to measure the loss factor, a VLF sine

wave voltage source (VLF Sinus test system) is required for applying a sinusoidal

voltage to the test object.

It does not matter if the VLF sine wave is used as a stand-alone system or as a

component of a measurement or diagnostics device.

It is only important that the version of the software used by this system is able to

analyse tanδ measured values. This is always evident in that a corresponding

operating mode is provided in the software.

If this is not the case, please contact your Megger sales representative.

The tan Delta test attachment has been developed and designed exclusively for

use with VLF sine wave systems of the Megger Group. If other test voltage sources

are used, no guarantee can be made for trouble-free functioning and correct

measurement results.

System components The tan Delta test attachment consists of three main components, which are

responsible for different tasks:

•Measurement unit

The “Measurement Data Unit” (MDU) is directly integrated in the HV link

between the sine wave source and test object and measures the object's

current and voltage. The measured data are transmitted to the software per

wireless signal via the E-Box.

•Termination Current Unit

(only if your product configuration includes leakage current compensation)

The task of the “Termination Current Unit” (TCU) is to record the leakage

current over the terminations and to transfer this information to the

measurement unit via the optical link.

•Data Reception Unit

The “Data Reception Unit“ (DRU) enables the exchange of control and

measurement data between the software and the measurement unit via

wireless signal and USB interface.

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