High Current Winding Resistance Meter - Haefely Test AG - #1

INSTRUMENTS

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High Current Resistance Meters

FEATURES

■ Fully automated resistance measurement of virtually any size and type of windings.

■ Large graphic display shows all data at a glance and supports quick and easy operation of the instruments.

■ Compact and rugged design for use in harsh environments in field or factory applications.

■ Three independent measurement channels allow testing of three series connected windings simultaneously.

■ Data exchange to printer or computer over built-in interface without additional software.

■ Remote control software to operate the unit from a laptop or PC, for easy gathering, exchanging and analyzing of measuring data. Optimized for transformer measurement and heat run test.

High performance is the key feature of these high current resistance meters based on the four point measuring technique. The instruments are especially designed and optimized for low resistance measurements in highly inductive circuits. The design responds to the needs of utilities and transformer manufacturers for a lightweight, portable unit with high accuracy and ease of operation.

The powerful built-in 1kW/2.5kW DC supply and the automatic controlled measuring circuitry are more than adequate to handle even the most demanding application. The DC current is continuously adjustable up to 33A/50A to accommodate resistance values from 0.1uH up to 20kn. The 33V/50V DC test voltage saturates even the largest transformers typically within seconds.

The instruments are capable to measure the resistance of up to three serial windings simultaneously. The test object temperature is measured and resistance readings are automatic temperature compensated for copper and aluminium windings using a standard or customized reference temperature.

An intrinsically safe discharge circuit dissipates the stored magnetic energy rapidly after the test. The discharge process is continuously monitored and clear indicators show when it is safe to remove the test leads.

The instrument is fully automatic and requires no measuring range adjustment. Measurements are performed according to the related IEC, NEMA and ANSI standards.

Complete field test reports can be generated on an optional printer. The report can also be sent over a RS-232C interface to a common PC or notebook. For factory use the system can be remote controlled by a host computer.

BENEFITS

Unmatched speed, range and accuracy make these instruments the perfect tools for cost-effective and reliable maintenance measurements.

Safety discharge circuit feature proofs and indicates the rapid discharge process to avoid any damage of personnel, test equipment and instrument.

Highest charging power guarantees fast saturation of even the largest power transformers within shortest time.

The 2291/2292 can be operated either as a single instrument or be combined with the transformer turns ratio meter TTR 2795 and the mobile insulation diagnosis and analyzing system MIDAS 2880 for an integrated transformer maintenance system.

APPLICATIONS

■ Power Transformers

■ Distribution Transformers

■ Instrument Transformers

■ Rotating Machines

■ Bushings

■ Cables

■ Circuit Breakers

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Haefely is a subsidiary of Hubbell Incorporated.

Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice.

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