Megger MTO250 50A Transformer Ohmmeter

With the Megger MTO250, Megger now have the beneficial capability of testing large transformers up to 10 times faster than a traditional 10 amp model. They have increased the current output by a factor of five, while maintaining the same weight as most 10 amp models. With the capability of testing two windings simultaneously, Megger’s MTO250 transformer ohmmeters reduce the time needed for testing by up to 50% compared with conventional instruments, making them an ideal choice for field and factory testing of current transformers, potential transformers and power transformer windings. The new testers also incorporate a comprehensive range of safety features to protect the user and the asset under test. MTO250 series ohmmeters are readily portable mains powered instruments that have been specifically designed to accurately measure the resistance of all types of magnetic windings. Typical applications include the testing not only of transformers, but also of shunt reactors and the windings of rotating machines. In addition, MTO250 test sets can be used for performing many other types of low resistance measurements. FEATURES Capable of testing transformers up to 1000 MVA. DC test current up to 50 A maximum. Integrated demagnetisation feature. Computer control and internal data storage. Validates proper operation of on-load tap-changers. Protected against accidental current lead disconnection (through potential leads). Megger MTO250 Specifications Input 85 - 264 VAC, 47 - 63 Hz, 1500 VA. User Selectable Current ranges 1 A / 10 A / 25 A / 50 A. Open Circuit Voltage 50 V Dc. Resistance Range 10 µΩ to 1000 Ω. Best Resolution 0.1 µΩ. Typical Accuracy +0.1% reading, +0.1% range. Guaranteed Accuracy +0.25% reading, +0.25% range (once current has stabilised). Current Resolution 4 digits. Current Accuracy +0.25%, +0.25% range. Computer Interface Downloading & Control Via Ethernet port. Internal Data Storage 9 groups (1-9) 99 results per group. LTC Make-Break Transition Settings 2 mS, 20 mS, 50 mS, 80 mS. Safety/EMC/Vibration EN61010-1 Safety ISTA 1A Shipping EN61326 EMC. General Operating Temperature 14° F to 122° F (-10° C to 50° C). Dimensions 8.5 H x 21.5 W x 13 D in (216 H x 546 W x 330 D mm). Weight Unit: net 30 lb (13.6 kg) Optional leads: net 29 lb (13 kg) (for 60 ft [18 m]) In optional transit case: net 96 lb (43.5 kg). Megger MTO250 warranty One-year.

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