IEEE Electrification Magazine - December 2015 - 46

By Luis Marti and Cynthia Yiu

USTY RECORDS OF ONTARIO HYDRO'S
activities in the study of geomagnetically induced currents (GICs) and their
effects on the power system go as far
back as the late 1970s. In the early
1980s, a network of four GIC monitors was in place
long before the notorious March 1989 geomagnetic
disturbance (GMD) event that caused the Hydro Quebec blackout.
Through the 1980s and 1990s, the intensity of GMDrelated activities in Ontario Hydro and in Hydro One (its
successor transmission and distribution company)
appear to have waxed and waned along with the sunspot cycles. However, since sunspot cycle 22, there have
been periodic reviews of the effects of GICs on protection systems, resulting in operational measures on the
basis of forecasts of GMD events of intensity K7 and
above as well as GIC measurements.
For cycle 23, operational measures [in addition to
safe posture as recommended by the Northeast Power
Coordinating Council (NPCC)] included recalling outages on key 500-kV circuits due to the risk of the cascading loss of an entire 500-kV corridor caused by the
potential misoperation of electromechanical relays
that triggered on-line imbalance. The NPCC's Procedures for Solar Magnetic Disturbances Which Affect Electric
Power Systems (Document C-15) provided actions (safe

D

real-Time
management
of Geomagnetic
disturbances
Hydro One's eXtreme Space Weather control room tools.
Digital Object Identifier 10.1109/MELE.2015.2480637
Date of publication: 2 December 2015

46

I E E E E l e c t r i f i cati o n M agaz ine / december 2015

2325-5987/15©2015IEEE



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