Smaller, lighter and with a higher output power than any other comparable three-phase instrument, Megger's new SMRT 36 smart protective relay test set is ideally suited not only for testing today's installations and legacy plant, but also for meeting the future challenges associated with testing the smart grid.

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 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 SMRT 36 to deliver high power in both the voltage and current channels as needed in high-burden applications, such as testing electromechanical relays. The constant power output of the current amplifiers produces a compliance voltage of 50 V at up to 4 A (200 VArms) 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 new PowerV voltage amplifiers. From 30 V to 150 V, these deliver a constant 150 VA, providing high current output at “difficult” low test voltages.

The new SMRT current amplifiers can deliver 30 A per phase continuous and up to 60 A per phase for short durations.

Megger | www.megger.com