MOM600A Data Sheet Brochure
User Manual: MOM600A-Data-Sheet-Brochure
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MOM600A Micro-ohmmeter MOM600A Micro-ohmmeter ▪▪Compact and rugged ▪▪Easy-to-use ▪▪600 A output current DESCRIPTION APPLICATION EXAMPLES Switchgear breakdowns are frequently caused by excessively high contact resistance at breakpoints and busbar joints. Moreover, overheating risks are becoming more serious due to the fact that today's distribution networks have to carry heavier loads. Checking contact resistances at regular intervals detects faults before they cause overheating. And here, an ounce of prevention is worth a pound of cure. A. Measuring the resistance of a circuit breaker element Micro-ohmmeters are used to measure contact resistances in highvoltage breakers, disconnecting switches (isolators), knife-contact fuses, bus joints, line joints etc. The MOM600A™ is in a class apart on world markets. Designed for use from the arctic to the tropics, this rugged, compact micro-ohmmeter is ideal for field work. A complete set of equipment includes a set of highly flexible cables (including separate measurement cables) and a sturdy transport case. 1. Connect the micro-ohmmeter to the circuit breaker. 2. Set the current (100 A in this example). 3. Press the resistance pushbutton. 4. Read the result. B. Measuring the resistance of busbar joints 1. Connect the micro-ohmmeter’s current cables to the object being tested. Do not connect the sensing cables since measurements will be taken using an external movable voltmeter. 2. Set the current (100 A in this example). 3. Connect an external voltmeter to the bus. 4. Read the voltmeter (0.1 mV = 1 µΩ in this example). 5. Move the voltmeter to the next joint. 6. Repeat step 4. A B MOM600A Micro-ohmmeter SPECIFICATIONS Load capacity, 230 V model Specifications are valid at nominal input voltage and an ambient temperature of +25°C, (77°F). Specifications are subject to change without notice. Environment Application field Temperature Operating 115 V Operating 230 V Storage & transport Humidity The instrument is intended for use in high-voltage substations and industrial environments. Current adjustment set to 100% Output Min. output Max. current voltage load time 100 A DC 8.3 V – 300 A DC 7.2 V 2.5 min. 600 A DC 5.6 V 15 s Rest time Input current – 15 min. 5 min. 6A 16 A 32 A 0°C to +50°C (32°F to +122°F) 0°C to +40°C (32°F to +104°F) -40°C to +70°C (-40°F to +158°F) 5% – 95% RH, non-condensing CE-marking EMC LVD 2004/108/EC 2006/95/EC General Mains voltage 115 / 230 V AC, 50 / 60 Hz Power consumption (max) 115 V, 4370 VA 230 V, 7360 VA Protection Miniature circuit breakers, thermal cut-outs Dimensions Instrument 356 x 203 x 241 mm (14” x 8” x 9,5”) Transport case 610 x 290 x 360 mm (24.0” x 11.4” x 14.2”) Weight, 115 V model 25 kg (55.1 lbs) 43.1 kg (95 lbs) with accessories and transport case Weight, 230 V model 24.7 kg (54.5 lbs), 42.8 kg (94.4 lbs) with accessories and transport case Current cables 2 x 5 m (16 ft), 50 mm² Sensing cables 2 x 5 m (16 ft), 2.5 mm² Cable set GA-05053 (2 current cables and 2 sensing cables) Measurement section Resistance range Resolution Inaccuracy 0 – 1999 μΩ 1 μΩ ±1% of reading + 1 digit (at 100 – 600 A test current) Output, 115 V model Current Open circuit voltage Current shunt output 0 – 600 A DC 5.2 V DC 10 mV / 100 A ±0.5%, max 60 mV out, max 10 V to protective earth (ground) Output, 230 V model Current Open circuit voltage Current shunt output 0 – 600 A DC 9 V DC 10 mV / 100 A ±0.5%, max 60 mV out, max 10 V to protective earth (ground) Load capacity, 115 V model Current adjustment set to 100% Output Min. output Max. current voltage load time 100 A DC 4.6 V 300 A DC 3.8 V 1.5 min. 600 A DC 2.6 V 10 s SALES OFFICE Megger Sweden AB Rinkebyvägen 19 SE-182 36 DANDERYD SWEDEN +46 8 510 195 00 seinfo@megger.com Rest time Input current 15 min. 5 min. 8A 20 A 38 A MOM600A_DS_en_V04a Art. No. ZI-BB05E ▪ BB0375EE ▪ 2017 Subject to change without notice. ISO 9001:2008 The word ”Megger” is registered trademark www.megger.com Ground cable GA-00200 Optional accessory: Calibration shunt BB-90020 ORDERING INFORMATION Item Art. No. MOM600A Complete with: Cable set GA-05053, Ground cable GA-00200, Transport case GD-00182 115 V Mains voltage BB-11190 230 V Mains voltage BB-12290 Optional accessories Cable set 10 m 2 x 10 m (33 ft), 70 mm2 (current cables). 2 x 10 m (33 ft), 2.5 mm2 (sensing cables) Weight: 16.8 kg (37 lbs) Cable set 15 m 2 x 15 m (49 ft), 95 mm2 (current cables). 2 x 15 m (49 ft), 2.5 mm2 (sensing cables) Weight: 29.4 kg (65 lbs) Calibration shunt 600 A/60 mV GA-07103 GA-09153 BB-90020
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