Electrical Power & Protection


The smart solution for protective relay testing

August 2014 Electrical Power & Protection

Megger’s SMRT36 is a small, light protective relay test set and has more output power than any other comparable three-phase instrument available anywhere. The SMRT36 has a unique constant power output, produces a compliance voltage of 50 V at up to 4 A (200 VA rms), and maintains 200 VA output power up to 30 A, making it ideally suited for testing in today’s installations and legacy plants.

The SMRT36 is Megger’s fourth generation of automated relay test sets. This test set takes full advantage of Megger’s patented developments from previous models to produce an instrument that offers greater precision than its predecessors, with reduced size and a reduced weight of only 12 kg. The SMRT Power Box is specifically designed to test protective relays that are used in conjunction with CTs having 1 A and 5 A secondaries. It combines the capacity to simulate high current faults with the amplifier precision needed to satisfy even the most demanding requirements. The instrument has three current output channels, plus three convertible channels that can be configured as either voltage or current outputs. This makes it possible, for example, to test numerical current differential relays that require six currents.

Its patented design allows the SMRT36 to deliver high power in both the voltage and current channels, as needed in high-burden applications such as testing electromechanical relays. The unique constant power output of the current amplifiers produces a compliance voltage of 50 V at up to 4 A (200 VA rms), and maintains 200 VA output power up to 30 A. Two current outputs can be series connected to double the compliance voltage to 100 V and provide a constant 400 VA output power at 4 A and up.

To facilitate panel testing and the testing of high-burden electromechanical distance protection relays, the high constant power output is also available from the PowerV voltage amplifiers. From 30 V to 150 V, these deliver a constant 150 VA, providing high current output at difficult low test voltages.

Of equal benefit is the high current output capability. The SMRT current amplifiers can deliver 30 A per phase continuous and up to 60 A per phase for short durations. For instantaneous overcurrent test applications, the SMRT36 can provide up to 180 A at high power.

Megger’s SMRT36 protective relay test set can be controlled manually with the optional Smart Touch View InterfaceTM (STVI), which provides a simple way of testing even the most complex relays. The STVI, with its large full colour high-resolution touchscreen, allows users to perform manual, steady-state and dynamic tests quickly and easily, and has built-in preset test routines for most popular relays. For fully automated testing, the SMRT is supplied standard with AVTS, Megger’s advanced visual test software package.

For more information contact Esias Labuschagne, Surgetek, +27 (0)11 792 1303, info@surgetek.co.za, www.surgetek.co.za



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