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Customer Success Story

Imperial Valley West

Series Capacitors to increase power transmission capability of 500 kV lines

San Diego Gas and Electric Co. (SDG&E) is operating two series capacitors supplied by Hitachi Energy in their 500 kV SouthWest Power Link at Imperial Valley in Southern California. One series capacitor, Imperial Valley East, is rated at 372 Mvar at 500 kV system voltage. The other, Imperial Valley West, is rated at 519 Mvar at 500 kV system voltage. The series capacitors have replaced two older units, supplied by Hitachi Energy in the 1980s.

The purpose of installing the series capacitors was to increase the power transmission capability of the South-West Power Link bringing power from the Palo Verde power plant up to the customer area of San Diego, thereby taking advantage of the inexpensive remote generation as compared to more expensive local generation in the San Diego area.

Main data    
System     FSC
Commissioning year     2003
   Imperial
Valley West
 Imperial
Valley East
Suncrest
System voltage   500 kV  500 kV  525 kV
 Rated current 2600 A   2200 A 1)  3000 A
 Rated reactive power  519 Mvar  372 Mvar 1)   976 Mvar
 Rated reactance  25.6 Ω  25.6 Ω 36 Ω 
 MOV rating (per phase)  41.5 MJ  52.5 MJ  68 MJ
 Seismic design factor (Horizontal acceleration at ground level)  0.7 g   0.7 g  0.5 g
 1) The series capacitor is prepared for a future upgrade to 2600 A, in which case the reactive power will be increased to 519 Mvar.