Megger NIM 1000 User Manual

NIM 1000

Net Impedance Meter

USER GUIDE

Issue: 04 (06/2016) - EN
Article number: 82941

1

2

Consultation with Megger

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: [phone]
F: [phone]
E: [e-mail]

Hagenuk KMT
Kabelmesstechnik GmbH

Röderaue 41
D - 01471 Radeburg / Dresden

T: [phone] – 0
F: [phone]
E: [e-mail]

Dr.-Herbert-Iann-Str. 6
D - 96148 Baunach

T: [phone] – 0
F: [phone]
E: [e-mail]

Megger USA

Valley Forge Corporate Centre
2621 Van Buren Avenue
Norristown, PA 19403 USA

T: [phone]
F: [phone]

 Megger

All rights reserved. No part of this handbook may be copied by photographic or other means unless Megger
have before-hand 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.

3

Terms of Warranty

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.

4

Contents

Contents

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

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

Contents ........................................................................................................................... 5

1 Basic Notes ....................................................................................................... 7

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

2.1 System Description ............................................................................................ 9

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

2.3 Connections, Controls and Display .................................................................. 12

3 Electrical connection ..................................................................................... 13

4 Operation ........................................................................................................ 16

4.1 System Settings ............................................................................................... 18

4.2 Performing Measurements ............................................................................... 19

4.2.1 Network Impedance Measurement .................................................................. 20

4.2.1.1 Prepare Measurement ...................................................................................... 20

4.2.1.2 Performing the Measurement ........................................................................... 22

4.2.1.3 Analysing Measurement Results ...................................................................... 23

4.2.2 Measuring in Fault Mode .................................................................................. 25

4.2.2.1 Preparing Measurement ................................................................................... 25

4.2.2.2 Performing the Measurement ........................................................................... 26

4.2.2.3 Identifying and Locating Faults ........................................................................ 27

4.3 Exporting the Measured Data .......................................................................... 28

5 Maintenance and care .................................................................................... 29

Annex 1: Measuring Accuracy ..................................................................................... 30

Annex 2: Measuring Range ........................................................................................... 32

5

Basic Notes

Labelling of safety

Working with products

1 Basic Notes

Safety precautions

instructions

from Megger

This handbook contains basic instructions for the initial use and operation of the NIM

1000. For this reason, it is important to ensure that the manual is always available to
authorised and trained personnel. Operating personnel 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.

The specific standards and regulations in each country must also be observed.

Important instructions concerning personnel, operational and technical safety are
marked in the text as follows:

Symbol Description

Indicates a potential danger of an electric shock that may result in fatal or
serious injury.

WARNING

CAUTION

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 directives (work, operating and safety regulations).

Indicates a potential danger that may lead to slight or moderate injury.

The notes contain important information and useful tips for using the
system. Failure to observe them can render the measurement results
useless.

Operating staff

Declaration of

Conformity (CE)

Use genuine accessories to ensure system safety and reliable operation. The use of
other parts is not permitted and invalidates the warranty.

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.

The product meets the following security requirements of the European Council
Directives:

• EMC Directive (2004/108/EC)

• Low Voltage Directive (2006/95/EC)

• RoHS Directive (2011/65/EU)

7

Basic Notes

Radiated emission

The device is intended for operation in the industrial segment in accordance with EN

55011. When used at home it could cause interference with other equipment (such as
the radio or television).

The interference level from the line complies with the limit curve B (living area), the
radiation level complies with the limit curve A (industrial area). Once the living area is
sufficiently far away from the planned area of operation (industrial area), equipment
there will not be impaired.

Use only as intended

Procedure in the event

that the device

malfunctions

The operating safety is only guaranteed if the delivered system is used as intended.
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. Condensation during the operation of Megger products may result in
danger to persons and devices through voltage arc-over. Prevent condensation before
and during the measuring mode by cooling the measuring systems sufficiently. The
operation of Megger products in direct contact with water, aggressive substances and
inflammatory gases and vapours is prohibited.

The NIM 1000 is built to be robust and can withstand the stresses it can expect to be
subjected to in demanding everyday use. Nevertheless, it is a precision measuring
device which needs to be treated with the appropriate care. This applies in particular to
the connection cable and the clamps, which play an important role in ensuring the
device remains safe while the results of measurements remain precise.

The system may only be operated whilst it is in perfect working condition. In the event of
damage, irregularities or malfunctions that cannot be resolved with the assistance of the
operating instructions, the system must be shut down immediately and labelled
accordingly. In such an event, the relevant management must be informed. Please
contact Megger Service immediately to eliminate the malfunction. The system may only
be started up again once the malfunction has been eliminated.

8

Technical Description

Intended use

Function

2 Technical Description

2.1 System Description

The NIM 1000 serves to measure network impedance in low voltage grids. In this
process, the conductor connections are tested for their current carrying capacity while
subjected to typical operating loads and potential flaws are indicated.

With the help of the following range of preventative applications, a consistently good
supply quality can be guaranteed, outages prevented and adequate network rating
ensured:

• Preventative inspection and uncovering of faults (e.g. neutral conductor fault)

• Determination of the maximum connected / feed-in power

• Monitoring for secure shut-down (rating of fuses)

• Approval of new / modified network sections

Fault detection in low voltage grids is another area of application of the device. For
example, the NIM 1000 can be used to trigger a load-dependent fault which can then be
located either with the help of a simultaneously connected measuring device or by
means of multiple measurements at various connection points.

The device is linked to the low voltage grid to be tested by means of the available
connection cables (four-conductor measurement with Kelvin clips) and also receives its
supply voltage over these wires.

In preparation for a measurement, either a defined measurement period or a target
number of measurements can be specified.

To determine the network impedance, the adjustable load current is generated for a
short period by means of a semi-conductor circuit-breaker with the appropriate load­resistor. The current and voltage curves are recorded immediately before and while
applying the load by means of A/D converters and then analysed by calculation. The
result is shown on the display.

When taking measurements on more than one phase, there is automatic switching
between the phases.

9

Technical Description

Features

Scope of delivery

Check contents

The NIM 1000 combines the following features in one device:

• Compact and sturdy design for portable use in the field

• Easy and convenient operation via rotary encoder

• Single and three phase measurement

• High test current of up to 1000 A

• Network impedance measurement (resistance and reactance) up to the

10th harmonic

• Automatic detection of rotary field

• Logging (export via USB interface)

• Wide range input for the voltage supply

The scope of delivery of the system includes the following:

Quantity Component Description Item number

1 Basic device 128312147

Optional accessories

4 High performance

Kelvin clamp

2 Connection lead brown 90009320

2 Connection lead black 90009321

2 Connection lead grey 90009322

2 Connection lead blue 90009323

1 NIM 1000-A socket

adapter

1 USB flash drive 890020928

10 Spare fuses T 25A H 440V (6.3 mm x 32 mm) 90004745

1 Manual 82941

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.

If the following optional accessories do not form part of the scope of delivery, these can
be ordered from sales:

Accessory Description Item number

PKC-1 90009319

128311627

Kelvin clip with
connection cable

Smaller clip ideally suited for use when space
is restricted.

10

138315892