Test Equipment Represented by



Test Equipment Represented by D'EWART REPRESENTATIVES L.L.C. TRANSFORMER TEST EQUIPMENT THREE-PHASE TTR Transformer Turns Ratio Test Set • Fully automatic operation • Measures three phases simultaneously • Highest ratio measurement (45,000:1); highest accuracy (0.1%) • Built-in storage and downloading capabilities • Measures ALL power transformers, PT's and CT's • Displays % error vs. name plate and pass/fail limits • Operator choice of "quick" test or complete "full" test • CE certified The Three-Phase Automatic TTR is designed to measure the turns ratio of power, instrument, and distribution transformers in a substation or manufacturing environment. At 16.5 lbs (7.5 kg), it weighs less than any other commercially available instrument. A rugged and robust design makes this TTR well suited for use in a variety of harsh environments. The TTR is also particularly suited for testing in power transformer manufacturing environments where testing of complex, three-phase substation power transformers can be performed quickly while minimizing the possibility of errors. This TTR measures the highest turns ratio range in the industry (45,000:1) and also provides the highest accuracy (0.1%). No other instrument's performance is comparable that is commercially available today. NEW TTR25Hand-held, Single-, Three-Phase Transformer Tester • Single- and three-phase transformer testing • Fully automatic; fast; easy-to-use; robust; lightweight • Battery powered • Tests turns ratio, excitation current, and polarity • Simple, one-button operation • Quick-start guide on front panel • Operator-selectable languages The Megger TTR25 is an automatic hand-held battery operated transformer turns ratio test set. It is used to measure the turns ratio, excitation current and polarity of windings in single- and three-phase distribution and power transformers (tested phase by phase), potential & current transformers, and tapped transformers. The unique design of the TTR25 allows the user to operate the test set while holding it in one hand. It effectively eliminates the user from having to kneel or bend down to operate the instrument and speeds up testing time. Realizing the extreme environments in which the TTR25 must operate, special attention has been paid to making it extra rugged, with a high impact, shock resistant case, yet incredibly lightweight at a mere 870 g (1.9 lbs). TTR100 Hand-held Single Phase Turns Ratio Test Set • Most accurate with highest turns ratio in the industry, +/- 0.1% • Fully automatic, fast, easy-to-use, robust and lightweight • Battery powered with power-saving and shutdown function • Tests turns ratio, phase displacement, excitation current, vector group, winding resistance and polarity • Alphanumeric keyboard • RS232 for data transfer and printing • Stores 200 test results and 100 user-defined transformer test settings The latest TTR available from Megger is the TTR100, a handheld, robust, lightweight and battery operated instrument. This TTR will complement several existing Megger transformer test products and will offer switchable functions, such as winding resistance and polarity. It is the only instrument in the market place that displays both tested and expected polarity results. With a turns ratio of 20,000:1, the TTR100 offers the highest turns ratio accuracy in the industry of 0.1%. The TTR 100 is used to perform tests in the field, as well as in manufacturing facilities and repair centers. Improved testing productivity is achieved in these environments through the efficient collection and storage of large amounts of data, which can then be uploaded to a PC database for analysis and test results reporting. SINGLE-PHASE TTR Transformer Turns Ratio Test Set • Used for testing single phase power and distribution transformers • Design based on precision bridge measuring technique • Available in hand-cranked or line-operated models • Unmatched accuracy (±0.1%) in a portable design The Single Phase TTR, Transformer Turns Ratio Test Set, measures the turns ratio and exciting current of windings in power, potential and current transformers. Deviations in turns ratio readings indicate problems in one or both windings or the magnetic core circuit. The TTR test set aids in identifying: • Shorted coils • Open circuits • Incorrect connections • Internal faults or tap-changer defects in step regulators as well as in transformers. The single phase model is available in either hand-cranked or line-operated versions and measures highly sensitive turns ratios of up to 129.99:1 with accuracy of ±0.1%. An optional auxilary transformer extends the ratio range to 329.99:1. The TTR set operates on the principle that the voltage ratio of the transformer at no load is practically equal to the true turns ratio. The major source of error in a transformer is a primary impedance drop due to magnetizing current, which is kept to a minimum by excitation at a fraction of rated voltage. By employing a design that meets both of these conditions along with the use of a null balance system, the turns ratio of a transformer can be determined accurately. When measuring the turns ratio of distribution and power transformers, the accuracy is well within 0.1%. THREE-PHASE TTR Transformer Turns Ratio Test Set • Fully automatic operation • Measures three phases simultaneously • Highest ratio measurement (45,000:1); highest accuracy (0.1%) • Built-in storage and downloading capabilities • Measures ALL power transformers, PT's and CT's • Displays % error vs. name plate and pass/fail limits • Operator choice of "quick" test or complete "full" test • CE certified The Three-Phase Automatic TTR is designed to measure the turns ratio of power, instrument, and distribution transformers in a substation or manufacturing environment. At 16.5 lbs (7.5 kg), it weighs less than any other commercially available instrument. A rugged and robust design makes this TTR well suited for use in a variety of harsh environments. The TTR is also particularly suited for testing in power transformer manufacturing environments where testing of complex, three-phase substation power transformers can be performed quickly while minimizing the possibility of errors. This TTR measures the highest turns ratio range in the industry (45,000:1) and also provides the highest accuracy (0.1%). No other instrument's performance is comparable that is commercially available today. TRANSFORMER OHMMETER WINDING RESISTANCE & TAP CHANGER TEST SET • Dual independent channels for simultaneous measurements on two windings • Built-in safety discharge and shut-down feature • Tests operation of on-load tap-changers This lightweight, field portable unit safely and accurately measures the DC winding resistance of all types of transformers and rotating machines. A built-in circuitry safely discharges the specimen when the test is completed, if load accidentally disconnected or if line power is lost. The Transformer Ohmmeter is extremely useful when testing the operation of on-load tap-changers. This instrument can be used to check the make-before-break operation of on-load tap-changers and also to measure the contact resistance of each tap position.

	D'Ewart Representatives L.L.C. represents MEGGER in Alaska, Washington, Oregon & Northern Idaho. If you are interested in MEGGER products and would like more information, call us at 425-485-6545 or use our information request form.