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This powerful test system is designed for primary injection testing

of protective relay equipment and circuit breakers. It is also used

to test the turns ratio of current transformers and for other

applications that require high variable currents.

The system consists of a control unit and a current unit. The two

parts are portable, and INGVAR can be quickly assembled and


The control unit has many advanced features – a powerful

measurement section for example, that can display turns ratio as

well as time, voltage and current. A second measurement channel

can be used to test an additional current or voltage. Current

transformer turns ratio, impedance, power, power factor (cos φ)

and phase angle are calculated and shown in the display. Current

and voltage can be presented as percentages of nominal value. The

fast-acting hold function freezes short-duration readings on the

digital display when the voltage or contact signal arrives at the stop

input, the object under test interrupts the current or injection is


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