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Verification of measured transmission system phase angles

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2 Author(s)
R. E. Wilson ; Western Area Power Adm., Montrose, CO, USA ; P. S. Sterlina

Measurement of power system phase angle is being studied for use in protective relaying, critical control circuits, and other applications. This paper compares phase angles measured by a synchronized measuring unit during field testing with classical theory. Power system positive sequence voltage and current phasors were recorded during testing of a new 525 kV compensated transmission system. Steady-state phase angles (δ) and magnitudes were measured relative to a satellite-based global time standard on synchronized measurement units at two substations. Phase angles were calculated using a recorded supervisory system and sending-end values of total power flow. Field measurements of the phase angle across a transmission system differed from calculations by -0.09° on average, contributing to verification of the new synchronized measurement technique

Published in:

IEEE Transactions on Power Delivery  (Volume:11 ,  Issue: 4 )