Megger SMRT1 Single Phase Protective Relay Test System

Megger SMRT1 Single Phase Protective Relay Test System

The SMRT1 single-phase relay test system, the SMRT1D and the SMRT1B are standalone units that combine high compliance voltage with high current to test electromechanical, solid-state and microprocessor-based overcurrent relays, including voltage controlled, voltage restraint, and directional overcurrent. It can also test under/overvoltage, negative sequence under/overvoltage, single-phase impedance, single-phase power, directional, synchronising, auto-synchronising, current balance, frequency, volts/hertz, reclosing, thermal, and various other relays (see the Applications sections for more).

The SMRT1 can be manually controlled with Megger’s new Smart Touch View Interface (STVI). The STVI is Megger’s second generation of automatic/semi-automatic manual user interface software. With its large, full colour, high resolution, TFT LCD touch screen, it allows you to perform manual, steady-state, and dynamic testing quickly and easily using the manual test screen, as well as using built-in preset test routines for most popular relays. The STVI 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/dissipation factor. Menu screens and touch screen function buttons are provided to quickly and easily select the desired test function. Tests results can be saved to the STVI for download to a USB drive to transfer or print test reports. The SMRT1D has the STVI built into the unit.

For full automatic testing, the SMRT1 (or SMRT1D) can also be placed under full computer control via the Relay Test Management Software (RTMS) running on a PC. RTMS is a Microsoft Windows XP/Vista/7/8/10 compatible software program designed to manage all aspects of protective relay testing.


The current channel is rated for 32 A at 200 VA continuous and up to 60 A at 319 VA for short durations. It has a unique flat power curve from 4 to 32 A that always ensure maximum compliance voltage to the load. With a high compliance voltage of 50 V, the SMRT1/1D has the capability to test high impedance overcurrent relays.


The voltage channel can provide a variable output of 0 - 30/150/300 V at 150 VA of output power and has a unique flat power curve from 30 to 150 V, always ensuring maximum output power to the load. With the voltage channel converted to current, it can perform minimum operating point, slope, and timing on current differential relays, including harmonic restraint transformer differential relays (which can be tested one phase at a time).


It is also designed to operate in conjunction with other SMRT family units. Using the Ethernet ports, SMRT1/1D is literally a “plug-and-play” unit, where voltage and current outputs can be seamlessly synchronized with other SMRT unit’s voltage and current outputs for testing more complex relays such as three-phase directional power, distance, and loss of excitation, with up to 30 phase currents for testing bus differential schemes.

Specifications: