Differential Protection for Phase Shifting Transformer

Toshiba has supplied a control and protection system for a Phase Shifting Transformer (PST) for TransGrid's 132kV network in Australia. The system, which is due to commence operation in December 2008 at the Armidale 330kV substation, includes Toshiba's GRT100 Transformer Differential Protection applied for protection of the PST and accommodating phase shifts of up to 30 degrees.  GRT100 supports 3-winding transformer differential protection with integrated restricted earth fault protection, overcurrent back-up, thermal overload and over-excitation protections. Extensive fault simulation and RTDS testing in the factory confirmed the correct operation and high performance of the protection prior to shipping.


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