APPLICATION NOTEUniversal Relay General Electric T60Differential Relay 87 module TDMS software

Differential Relay 87 Modulewith TDMS software and DRTS 66A completely new way of tes ng for transformer diff eren al protec ons is now possible. In few steps the user can easily set up a complete network model for the best fault simula on: . Power Transformer vector group. Earthing transformers. Current Transformers connec ons (wye, delta) . YDY Interposing transformers for a proper phase and zero-sequence compensa on.

APPLICATION NOTEUniversal Relay General Electric T60Differential Relay 87 module TDMS software

This applica on note will guide you step by step to perform tests on Diff eren al Relay, using TDMS so ware.

Set the Power Transformer vector group, the nominal primary and secondary voltage and the rated power.

The magnitude compensa on factor must be calculated according to the GE T60 formulas

Phase and zero sequence can be compensated internally by the relay or externally with a proper CTs connec on, in this example the compensa on is internal:

For General Electric relays the reference winding for the phase shi compensa on is the fi rst delta, in this case the reference winding is the primary.

APPLICATION NOTEUniversal Relay General Electric T60Differential Relay 87 module TDMS software

In case of external compensa on, the user must disable the internal Phase and Zero Sequence compensa on and select the proper delta connected CT group.

The number inside the relay picture represents the phase shi between the primary and secondary currents, it is zero when the phase shi is well compensated.

APPLICATION NOTEUniversal Relay General Electric T60Differential Relay 87 module TDMS software

The trip characteris c can be set by copying directly the relay parameters, the special GE T60 curve will be plo ed automa cally.

Decide the fault side and the faulty phase and perform an automa c verify of the tripcharacteris c. The results are stored in the results table and they are displayed graphically for a quick and easy analysis.

APPLICATION NOTEUniversal Relay General Electric T60Differential Relay 87 module TDMS software

Possibility to perform Harmonic Restraint characteris c test from the second to the seventh harmonic of the fundamental frequency.

December 2015

Bibliography

ISA - TDMS user manual - MSE 10015ISA - DIFF 87 user manual - MSE 20029ISA - DRTS 66 user manual rev. 1.33 - MIE 10170General Electric - GE Mul lin - T60 Transformer Protec on System - UR Series instruc on manual