Transformer winding resistance ohmmeters/ MTO250 – 50 A Transformer Ohmmeter

Description

Transformer winding resistance ohmmeters/ MTO250 – 50 A Transformer Ohmmeter

MTO250 Transformer ohmmeter is a line-operated, field-portable instrument designed specifically to measure the resistance of all types of magnetic windings safely and accurately. It tests transformers, shunt reactors, rotating machine windings and performs low resistance measurements on connections, contacts and control circuits. The dual set of potential inputs enables the resistance measurement of either two primary, two secondary windings, or of a primary plus a secondary winding simultaneously. Transformer  winding resistance ohmmeters  have dual reading, dual injection characteristic, is a highly efficient method of completing tests in a timely manner.

MTO250 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)

Transformer  winding resistance ohmmeter MTO250 Typical applications

MTO250 Transformer Ohmmeter in India  is used to:n  Perform field testing of CT, PT, power transformer windings and their associated tap changers, and motors/generators.n  Verify factory winding resistance test results.n  Perform factory heat run tests.n  Diagnose and pinpoint problems such as the presence of defects in transformers, such as loose connections, and poor tap changer operation.n  To validate proper “make-before-break” operation of  load tap-changers (LTC).

Features and benefits of Transformer  winding resistance ohmmeter MTO250

• 50 amp test current reduces test time on high current secondary windings by up to 10 times when compared to traditional 10A units.
• Internal data storage with nine internal sets (groups) of results, allowing for easier organization while in the field.
• Two channel digital displays allows for testing two windings at a time, improving traditional test time by 50% or more.
• Computer-aided test form guides operator through connections and tests for all single- and three-phase transformers via PC control or data download.
• Checks the contact and timing health of on-load tap changers.
• Patented universal kelvin clamps, with 4 in. (100 mm) adjustable jaws are available, eliminating the need for multiple types of lead clips. Each kelvin clamp also includes banana plugs for use of external probes for testing on terminal blocks.
• Built-in safety discharge circuit safely discharges the specimen when test is completed, if lead accidentally disconnects, or if power is lost.
• Automated “heat run” testing and report via PowerDB software.