MJÃLNER600A Data Sheet Brochure
User Manual: MJÃLNER600A-Data-Sheet-Brochure
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▪▪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 in thermal printer
▪▪PC interface connection
DESCRIPTION
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.
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.
Choose the MJÖLNER 600 with excessive power resources for
demanding applications, superior measurement accuracy and when
300 Amp continuous is required.
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.
Optional accessories are a remote control and the PC software
MJÖLNER Win with export functions for tables to Microsoft® Excel®
MJÖLNER 600
Micro-ohmmeter
APPLICATIONS
MJÖLNER 600 test system is designed to serve a number of applica-
tions. 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 contact resistance measurements concerning breaker testing are
particularly called for in the following standards:
IEEE C37.09-1999 and IEC 62271-1 (2011).
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:
Current Contact resistance Power loss
10 kA 1 mΩ 100 kW
10 kA 0.1 mΩ 10 kW
1 kA 1 mΩ 1 kW
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
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
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
1
2
3
4
5
8
12
13
14
15
16
6
7
10 119
Current cables in separate bag
Perfect balance when carrying the equipment.
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.
MJÖLNER 600
Micro-ohmmeter
BOTH SIDES GROUNDED
Many utilities require safety grounds remain in place during station
outages, therefore, the MJÖLNER 600 was designed with this field
safety constraint in mind.
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 instru-
ments that can use the DualGround testing:
Timing TM1700/1800 with DCM module
Motion TM1700/1800
Dynamic Resistance
Measurement (DRM)
TM1700/1800 with SDRM202
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.
APPLICATION EXAMPLES
Circuit Breaker testing
▪ 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 devices
▪ Safety ground connections
▪ Welding points
▪ 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
SPECIFICATIONS
Specifications are valid at nominal input voltage. Specifications are
subject to change without notice.
Environment
Application field The instrument is intended for use in
high-voltage substations and industrial
environments.
Temperature
Operating -20°C to +50°C (-4°F to +122°F)
Storage & transport -40°C to +70°C (-40°F to +158°F)
Humidity 5% – 95% RH, non-condensing
CE-marking
LVD 2014/35/EU
EMC 2014/65/EU
General
Mains voltage 100 - 120 / 200 - 240 AC, 50 / 60 Hz
Input current (max) 39 A at 100 V, 18 A at 230 V (3 sec)
Protection Fuses (200 mAT and 400 mAT)
Thermal fuse, Software
Shut off temperature: 70ºC (158ºF)
internal temperature
Dimensions 486 x 392 x 192 mm (19” x15” x 7.5”)
Weight 13.8 kg (30.4 lbs)
Display LCD and LED
Available languages English, Deutsch, Français, Espagñol,
Svenska
Printer Thermal printer
Thermal paper roll Width 57.5 mm, diameter 30 mm
Current cables 2 x 3 m (9.8 ft), 35 mm²
Sensing cables 2 x 3 m (9.8 ft), 2.5 mm²
Measurement section
Range 0 – 999.9 mΩ
Resolution 0.1 μΩ below 1.0 mΩ
1 μΩ below 10 mΩ
10 μΩ below 100 mΩ
100 μΩ below 1000 mΩ
Inaccuracy Typ. Max.
100 A, ta 25ºC,
R < 1 mΩ ±0.2 μΩ ±1 μΩ
50 – 600 A, ta 10 – 40ºC,
R < 1 mΩ ±0.3 μΩ ±2 μΩ
50 – 600 A, ta 0 – 50ºC,
R < 1 mΩ ±0.7 μΩ ±3 μΩ
50 – 600 A, ta -20 – 50ºC,
R < 1 mΩ ±1.1 μΩ ±4 μΩ
600 A, ta 10 – 40ºC,
1 mΩ < R < 8.4 mΩ ±6 μΩ ±50 μΩ
50 A, ta 10 – 40ºC,
10 mΩ < R < 100 mΩ ±80 μΩ ±500 μΩ
5 A, ta 10 – 40ºC,
100 mΩ < R < 1000 mΩ
±1 mΩ ±10 mΩ
Current shunt 600 A, 60 mV
Sense ranges 0-2 mV, 0-20 mV, 0-200 mV, 0-5 V
Outputs
DC+ / COM
Range 5 – 600 A DC (steps of 1 A)
Max. output voltage 5.25 V at 600 A
Max. ripple 80 mVpp, 28.3 mVrms
at 0 - 50°C (+32°F to +122°F)
Max. load capacity1)
300 A Continuous
OUTPUT 100 μV/A
Shunt output From internal shunt 60 mV at 600 A
Inaccuracy ±1%
Inputs
SENSE Max. 20 V between terminals and to
protective earth(ground)
INPUT
DC current clamp
Max. 20 V between terminals and to
protective earth(ground)
Input sensitivity Adjustable 0.1 – 20 mV/A
Input impedance >1 MΩ
1) At 25°C (77°F) ambient temperature
MJÖLNER 600
Micro-ohmmeter
OPTIONAL ACCESSORIES
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
The temperature probe is used for temperature compensation
of conductors (copper and other metals).
MJÖLNER Win
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.
Extension cables
Extension cable sets, 5 m and 10 m.
The 5 m set, GA-03205, includes two current cables 5 m, 35 mm
2
and two sensing leads, black and red, 10 m.
The 10 m set, GA-03205, includes two current cables 10 m, 35 mm
2
and two sensing leads, black and red, 15 m.
DualGround kit
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
Calibration shunt, 200 A / 20 mV (BD-90022)
MJÖLNER 600
Micro-ohmmeter
Postal address
Megger Sweden AB
Box 724,
SE-182 17 Danderyd
SWEDEN
T. 08 510 195 00
E. seinfo@megger.com
MJÖLNER-600_DS_en_V08a
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
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 mm2BB-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
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
INCLUDED ACCESSORIES
Ground cable, 5 m (16 ft) 2.5 mm2
Cable set, current cables 2 x 5 m (16 ft), 35 mm2
Sensing cables 2 x 5 m (16 ft)
