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Voltage Dip Contracts Between Detroit Edison and Automobile Manufacturers

Voltage Dip Contracts Between Detroit Edison and Automobile Manufacturers D. Daniel Sabin, Electrotek Concepts Andrew Dettloff, Detroit Edison Company Erich W. Gunther, Electrotek Concepts 1995 Agreement, Amended 1998

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Voltage Dip Contracts Between Detroit Edison and Automobile Manufacturers

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  1. Voltage Dip Contracts Between Detroit Edison and Automobile Manufacturers D. Daniel Sabin, Electrotek Concepts Andrew Dettloff, Detroit Edison Company Erich W. Gunther, Electrotek Concepts

  2. 1995 Agreement, Amended 1998 • In 1995 entered into long term agreement with DaimlerChrysler, Ford Motor Company, and General Motors Corporation – Special Manufacturing Contract (SMC) • Liable for interruptions (1995) and dips (1998) that exceed performance targets • 50 locations for the 3 customers, 140 monitors (multiple busses monitored) • SMC applies per location

  3. Five Rules to Qualify for Payment • One or more phases < 0.75pu, any duration • Voltage dips caused by customer excluded • Dips measured on unloaded feeder excluded • Only worst dip (lowest magnitude) in 15 minute interval at each location qualifies • If interruption and dips both occur in 15 minute interval, only interruption qualifies

  4. Sag Score • The sag score is the average per unit voltage lost by these three phase voltages. It is defined by the following equation. • For example, if VA = VB = VC = 0.722 pu, then the sag score computed would be 0.278 pu. On the other hand, if VA = 0.818 pu, VB = 0.574 pu, and VC = 0.823 pu, then the sag score would be 0.262 pu.

  5. Sag Score Targets • Sag score targets are determined for groups of multiple locations. • A sag score target is the maximum sum of sag score values allowable for a group of locations before compensation is due. • For DC and GMC, there is one group sag score target. • Ford Motor Company has six group sag score targets. • When a sag score report is produced, the sag scores for all qualifying dips in a group are summed and compared to its group sag score target. If the sag score total exceeds the group sag score target, then compensation is computed.

  6. Conclusions • Sophisticated power monitoring and analysis system required • Specialized reports developed to quickly highlight problems in the power delivery system • DECo has become more active with system improvement projects as a result of the SMC • Customers are receiving the responsiveness that they originally sought • SMC currently set to expire December 2004

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