Megger SMRT36D Smart Grid Relay Test System

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The Megger SMRT36D is a multipurpose, light-weight, field portable test set capable of testing a wide variety of elctro-mechanical, solid-state and microprocessor-based protective relays, small molded case circuit breakers, motor overload relays and similar protective devices. The unit can be operated either manually via the built-in touch-screen user interface, or placed under full computer control via the AVTS, Advanced Visual Testing Software, or the STVI software running on a PC.

The built-in user interface, called the Smart Touch-View Interface(STVI), is Megger's second generation of automatic / semi-automatic manual user interface software. It incorporates a large, easy to read Full Color high resolution, high definition, TFT LCD touch-screen display, which displays metered values such as AC and DC Amperes, AC and DC Volts, and Time in both seconds and cycles. Depending on the type of test selected, other values may be displayed, such as Phase Angle, Frequency, Ohms, Watts, VA, or Power Factor.

The test system may be customized by adding the number of Voltage-Current, “VIGEN”, modules needed for specific test applications, with a maximum of 3 channels. For example, the Megger SMRT36D with three VIGEN Modules provides complete three-phase testing of three-phase impedance, directional power, negative sequence overcurrent and other devices that require a three-phase four-wire wye connected sources.

Each current channel is rated for 30 Amps @ 200 VA rms continuous, and up to 60 Amps @ 300 VA rms for short durations. For testing relay panels or electromechanical relays, it has a unique flat power curve from 4 to 30 Amps that insures maximum compliance voltage to the load at all times.

With a maximum compliance voltage of 50 Volts per phase, two channels in series provide 100 Volts to test high impedance relays. Three currents in parallel provide test currents up to 12 Amperes at 600 VA for testing ground overcurrent relays at high multiples of tap rating. With three currents in parallel it can provide up to 180 Amps at 900 VA for testing all instantaneous overcurrent relays.

Each voltage channel can provide variable outputs of 0- 30/150/ 300 Volts at 150 VA of output power. Automatic range changing is done on-the-fly and under load. For testing a panel of relays or older electromechanical impedance relays, it has a unique flat power curve from 30 to 150 Volts insuring maximum output power to the load at all times. With the voltage channels converted to currents, a three channel unit can provide 6 currents for testing three phase current differential relays, including harmonic restraint transformer differential relays.