MJÖLNER600A Data Sheet Brochure

User Manual: MJÖLNER600A-Data-Sheet-Brochure

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MJÖLNER 600

Micro-ohmmeter

MJÖLNER 600
Micro-ohmmeter

▪▪Fully

automatic testing – Micro processor
controlled

▪▪Safe

test – DualGround™ and Remote
control

▪▪True

DC – ripple free current

▪▪Lightweight

suitcase – withstands the
impact of water, dust or sand

▪▪Built
▪▪PC

in thermal printer

interface connection

DESCRIPTION

APPLICATIONS

The MJÖLNER™600 is designed to measure the resistance of circuit
breaker contacts, bus-bar joints, contact elements in bus-bars and
other high-current links. The product has been designed with safety,
ease of use and versatility in mind.

MJÖLNER 600 test system is designed to serve a number of applications. The most common are contact resistance measurements of
low-, medium- and high-voltage breakers and also at bus-bar joints,
and other high current links.

The micro-ohmmeter conducts true DC ripple free current and can
be used anywhere to measure a low resistance value with high
accuracy. With MJÖLNER 600 it is possible to make measurements
according to the DualGround™ method. This means that the test
object will be grounded on both sides throughout the test giving a
safer, faster and easier workflow.

The contact resistance measurements concerning breaker testing are
particularly called for in the following standards:
IEEE C37.09-1999 and IEC 62271-1 (2011).

Choose the MJÖLNER 600 with excessive power resources for
demanding applications, superior measurement accuracy and when
300 Amp continuous is required.

If the contact resistance is too high this will lead to power loss and
temperature rise, which often leads to serious trouble. To avoid such
problems, it is necessary to check the resistance at regular intervals.
The following table demonstrates how important low resistance is at
high currents:

The lightweight and rugged suitcase design makes MJÖLNER 600
an excellent choice when you need a portable solution in the field.
When the case is closed, the product can withstand the impact of
water, dust or sand – it even floats.

Current

Contact resistance

Power loss

10 kA

1 mΩ

100 kW

10 kA

0.1 mΩ

10 kW

1 kA

1 mΩ

1 kW

Optional accessories are a remote control and the PC software
MJÖLNER Win with export functions for tables to Microsoft® Excel®

1 kA

0.1 mΩ

100 W

At 10 kA a contact with the resistance 0.1 mΩ gives a power loss
of 10 kW. This power loss in one single point will definitely confer
a temperature rise, which may result in overheating and possibly
premature failure.

MJÖLNER 600
Micro-ohmmeter

FEATURES AND BENEFITS
1. Grounding terminal
2. Connection for mains voltage
3. Switch for mains voltage
4. TEMP. SENSOR
This interface is for connection of a temperature probe for
temperature compensating.
5. INTERFACE
For communication with PC and MJÖLNER Win.
6. DATALOGGER
Port to connect a USB stick for datalogging. Results can be
viewed with Excel.
7. REMOTE
Remote control connector
The remote controls current value, start /stop of measurement
and print out function.
8. Printer

Suitcase shape
The unit comes close to the body thus making the unit easier
to carry. Rugged plastic housing, in most cases no need for an
additional heavy transport case.

9. Keys to control the menu functions
10. Start/Stop key with status LED
11. Adjustment keys to set the measuring current and all menu
values
12. DC+ current output
13. Sensing terminals
14. DC- current output
15. Shunt output
16. Clamp sense input

Current cables in separate bag
Perfect balance when carrying the equipment.

1
12

2
3

13
14

4
5
6

15
16

7

8

9

10

11

MJÖLNER 600
Micro-ohmmeter

APPLICATION EXAMPLES

BOTH SIDES GROUNDED

Circuit Breaker testing

Many utilities require safety grounds remain in place during station
outages, therefore, the MJÖLNER 600 was designed with this field
safety constraint in mind.

„„Test

of circuit breaker contacts

„„Test

of the connections to the breaker

Testing of Bus-bar
„„Test

of Bus-bar joints

„„Test

of connections

Transformer testing
„„Winding

resistance – not on all type of transformers.
(In many transformers there is a need for higher voltage
than 5 V)

„„Internal/external

connections

Everywhere you need to test a low resistance/
high current connection
„„Switches
„„Disconnecting
„„Safety

devices

ground connections

„„Welding

points

Minimum time shall be spent in the substation and focus shall be on
the test rather than the equipment.
The DualGround™ testing method is available for all tests on all
circuit breakers.
The following table indicates other test methods and Megger instruments that can use the DualGround testing:
Timing

TM1700/1800 with DCM module

Motion

TM1700/1800

Dynamic Resistance TM1700/1800 with SDRM202
Measurement (DRM)

Equipment and methods that supports DualGround™ testing
are associated with the DualGround symbol. This symbol
certifies the use of groundbreaking technology and methods
that enables a safe, fast and easy workflow with both sides
grounded throughout the test.

„„Fuses
„„Cables

Using the remote control you can measure the voltage drop
(voltage) across each contact element within every section of
the bus-bar being tested.

You can make tests with both sides of the test object
grounded, an additional safety feature.

MJÖLNER 600
Micro-ohmmeter
Outputs

SPECIFICATIONS
Specifications are valid at nominal input voltage. Specifications are
subject to change without notice.

Environment
Application field

Temperature
Operating
Storage & transport
Humidity

The instrument is intended for use in
high-voltage substations and industrial
environments.
-20°C to +50°C (-4°F to +122°F)
-40°C to +70°C (-40°F to +158°F)
5% – 95% RH, non-condensing

SENSE

2014/35/EU
2014/65/EU

General
Mains voltage
Input current (max)
Protection

Dimensions
Weight
Display
Available languages
Printer
Thermal paper roll
Current cables
Sensing cables

100 - 120 / 200 - 240 AC, 50 / 60 Hz
39 A at 100 V, 18 A at 230 V (3 sec)
Fuses (200 mAT and 400 mAT)
Thermal fuse, Software
Shut off temperature: 70ºC (158ºF)
internal temperature
486 x 392 x 192 mm (19” x15” x 7.5”)
13.8 kg (30.4 lbs)
LCD and LED
English, Deutsch, Français, Espagñol,
Svenska
Thermal printer
Width 57.5 mm, diameter 30 mm
2 x 3 m (9.8 ft), 35 mm²
2 x 3 m (9.8 ft), 2.5 mm²

Measurement section
Range
Resolution

Inaccuracy
100 A, ta 25ºC,
R < 1 mΩ
50 – 600 A, ta 10 – 40ºC,
R < 1 mΩ

0 – 999.9 mΩ
0.1 μΩ
below 1.0 mΩ
1 μΩ
below 10 mΩ
10 μΩ
below 100 mΩ
100 μΩ below 1000 mΩ
Typ.
Max.
±0.2 μΩ

±1 μΩ

±0.3 μΩ

±2 μΩ

±0.7 μΩ
50 – 600 A, ta -20 – 50ºC,
R < 1 mΩ
±1.1 μΩ
600 A, ta 10 – 40ºC,
1 mΩ < R < 8.4 mΩ
±6 μΩ
50 A, ta 10 – 40ºC,
10 mΩ < R < 100 mΩ
±80 μΩ
5 A, ta 10 – 40ºC,
±1 mΩ
100 mΩ < R < 1000 mΩ

±3 μΩ

50 – 600 A, ta 0 – 50ºC,
R < 1 mΩ

Current shunt
Sense ranges

Max. load capacity1)
300 A
OUTPUT 100 μV/A
Shunt output
Inaccuracy

5 – 600 A DC (steps of 1 A)
5.25 V at 600 A
80 mVpp, 28.3 mVrms
at 0 - 50°C (+32°F to +122°F)
Continuous
From internal shunt 60 mV at 600 A
±1%

Inputs

CE-marking
LVD
EMC

DC+ / COM
Range
Max. output voltage
Max. ripple

±4 μΩ
±50 μΩ
±500 μΩ
±10 mΩ

600 A, 60 mV
0-2 mV, 0-20 mV, 0-200 mV, 0-5 V

INPUT
DC current clamp
Input sensitivity
Input impedance
1)

Max. 20 V between terminals and to
protective earth(ground)
Max. 20 V between terminals and to
protective earth(ground)
Adjustable 0.1 – 20 mV/A
>1 MΩ

At 25°C (77°F) ambient temperature

MJÖLNER 600
Micro-ohmmeter

OPTIONAL ACCESSORIES

Extension cables

Remote control

Many times, you place the test equipment on the ground
while the cables are connected high up on a circuit breaker.
In these situations, it can save a lot of time using a remote
control during the test. The remote control has most of
the functionality in the MJÖLNER 600 such as starting and
stopping, setting the test current and read out the test values.

Temperature probe

Extension cable sets, 5 m and 10 m.
The 5 m set, GA-03205, includes two current cables 5 m, 35 mm2
and two sensing leads, black and red, 10 m.
The 10 m set, GA-03205, includes two current cables 10 m, 35 mm2
and two sensing leads, black and red, 15 m.

DualGround kit

The temperature probe is used for temperature compensation
of conductors (copper and other metals).

MJÖLNER Win

DualGround kit XA-12992, Current clamp, 200 A (XA-12792),
test cables 5 m, black (04-35050) and red (04-35052).
Note: Included in Ordering No. BD-19193

Calibration shunt

The Windows program makes it easy to manage/save all test
results in a simple way. All information, meta-data of the test
object e.g. a circuit breaker and the test results are stored
together and they can easily be transferred to Microsoft®
Excel for further analysis.

Calibration shunt, 200 A / 20 mV (BD-90022)

MJÖLNER 600
Micro-ohmmeter

INCLUDED ACCESSORIES

Ground cable, 5 m (16 ft) 2.5 mm2

Cable set, current cables 2 x 5 m (16 ft), 35 mm2

ORDERING INFORMATION
Item

Art. No.

MJÖLNER 600
Incl. Cable set, current cables 2 x 5 m (16 ft), 35 mm2
and sensing cables 2 x 5 m
Ground cable, 5 m (16 ft) 2.5 mm2
BB-59091
Incl. Cable set, current cables 2 x 5 m (16 ft), 35 mm2
and sensing cables 2 x 5 m
Ground cable, 5 m (16 ft) 2.5 mm2
DualGround kit, (XA-12992)
BB-59093
Optional accessories

Sensing cables 2 x 5 m (16 ft)

MJÖLNER Win
Windows® software

BD-8010X

Remote control
With connection cable, 5 m (16 ft)

BD-90010

Temperature probe

BD-90012

Thermal paper roll (for printer)

GC-00050

Extension cable set 5 m
Current cables 2 x 5 m, 35 mm2
and sensing cables 2 x 8 m

GA-03206

Extension cable set 10 m
Current cables 2 x 10 m, 35 mm2
and sensing cables 2 x 13 m

GA-03208

Calibration shunt
200 A / 20 mV shunt

BD-90022

DualGround kit
DC Current clamp 200 A and test cables 2 x 5 m (16 ft) XA-12992

Postal address

MJÖLNER-600_DS_en_V08a

Megger Sweden AB
Box 724,
SE-182 17 Danderyd
SWEDEN

Printed matter:
Art.No. ZI-BB01E ◾ Doc. BB0383HE ◾ 2017
Subject to change without notice
Registered to ISO 9001 and 14001
The word ‘Megger’ is a registered
trademark

T. 08 510 195 00
E. seinfo@megger.com



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