• Includes test cables with Kelvin Clamps
• Up to 220A
• Battery-powered
• Lightweight - 1 kg
• Safe test - DualGround
• Auto range: 1 µO to 1000 mO
• Bluetooth PC communication

The Megger MOM2 KC3M Micro-Ohmmeter is designed to measure the resistance of circuit breaker contacts, bus-bar joints and other high-current links. This product is designed with safety, ease of use, and versatility in mind. It includes test cables with Kelvin Clamps.

The Megger MOM2 (BD-59093) Micro-Ohmmeter uses an ultra capacitor to generate the high output current. The ultra capacitor is able to store a huge amount of energy compared to conventional capacitors and can deliver a very high current during the discharge thanks to its very low internal resistance.

The Megger MOM2 (BD-59093) Micro-Ohmmeter can be used anywhere to measure a low resistance value with high accuracy. With MOM2 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. This gives a personal safe, quick, and easy measurement.

The ruggedness and lightweight make the Megger BD-59093 a handheld instrument very suitable for fieldwork, such as in substations. The unit comes with a strong rubber holster accessory which makes it extra durable. MOM2 is dimensioned to make a full day’s work of testing without recharge. It can store 190 test values and transfer test data to a PC via Bluetooth.

Low weight, ease of use, and versatility have been key issues during product development. New patent-pending technology has made MOM2 small and light, it weighs about 1 kg. Despite the small size and lightweight, the instrument can deliver a maximum current of about 220A short duration and up to 100 A for three seconds.

The MOM2 uses an ultra capacitor to generate the high-output current. Ultra capacitors are able to store huge amounts of energy compared to conventional capacitors. In addition, they can deliver very high currents during discharge as a result of their very low internal resistance.

While testing, the capacitor is discharged through the test object. The voltage drop across and the current flow through the test object are continuously and synchronously sampled. The resistances calculated from the individual samples are then averaged to obtain the final value.

MOM2 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.

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:

At 10 kA a contact with the resistance 0.1 mO 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.

Within electrical power utilities, switchgear owners and service companies, there is an increased emphasis on efficiency of operations, maintenance and service levels. There is an increased emphasis on health, safety, and environmental compliance. Experience has also shown demands for shorter time periods for testing, while the switchgear is less and less available to be taken out of service.

Many utilities require safety grounds to remain in place during station outages, therefore, the MOM2 was designed with this field safety constraint in mind. DualGround means that the test object will be grounded on both sides throughout the test giving a safer, faster and easier workflow. Minimum time shall be spent in the substation and focus shall be on the test rather than the equipment.

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1.  Current output terminal (-)

2. Current output terminal (+)

3. Display

- The display offers a combination of analog arc and a dual digital readout:

- Analog arc: Indicates level of the capacitor charge.

- Dual digital display: Large main digital readout for good visibility of all main measurement results, Second digital display for additional data.

4. Ground (earth) terminal

5. Keys for navigation and to make settings in the display

6. TEST-button

7. Stand-by/Wake up (Press shortly to toggle) Clear log (Press and hold for 5 seconds)

8. Function selector

9. Connector for the voltage (–) sense lead

10. Connector for the voltage sense (+) lead and the trig function

11. Connector for the battery charger

12. Battery charger indicator

The Kelvin probes (included in BD-59090) are used for a 4-wire Kelvin test. This is a way of measuring continuity resistances ensuring all contact and lead resistances are compensated for, allowing much greater accuracy in measurements. Each Kelvin probe assembly has two probe tips: one tip is for the current generated; the other will measure the very small voltage present.

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

Everywhere you need to test a low resistance/high current connection

• Switches
• Disconnecting devices
• Safety ground connections
• Welding points
• Fuses
• Cables

Within electrical power utilities, switchgear owners and service companies, there is an increased emphasis on efficiency of operations, maintenance and service levels. There is an increased emphasis on health, safety, and environmental compliance. Experience has also shown demands for shorter time periods for testing, while the switchgear is less and less available to be taken out of service.

Many utilities require safety grounds to remain in place during station outages, and the MOM2 was designed with this field safety constraint in mind. DualGround means that the test object will be grounded on both sides throughout the test giving a safer, faster and easier workflow. The minimum time is spent in the substation and focus is on the test rather than the equipment.

Conventional vs Dual Ground

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

The traditional measurement from the ground. The injection is done through the existing grounding cable (earthing). An optional cable kit is needed. Available kits have 5, 10, or 15 m cables.

Measurement on CB with both sides grounded, DualGround.