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This document discusses how to select a ferroresonance damping resistance for an open delta winding. It recommends using a 50-60 ohm resistor, or lower if oscillation occurs at half the rated frequency. For an ABB voltage transformer with a rated secondary of 100/3 or 110/3 volts, a 22 or 27 ohm resistor with a power rating of 450W is recommended. A new device called VT Guard can also be used instead of a resistor to prevent ferroresonance.

Author

Sattawat Punta

Language

EN