FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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ELECTRICAL POWER DISTRIBUTION SYSTEM IMPROVEMENTS, PROJECT NO. J-98
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION: Recommend to the Board of Directors to:
A. Approve a Professional Services Agreement with Schweitzer Engineering Laboratories Engineering Services (Schweitzer) to provide final design, programming, testing, commissioning, and training for a load-shedding system and electrical power protective relay system for Electrical Power Distribution System Improvements, Project No. J-98, for a total amount not to exceed $1,296,878; and
B. Approve a contingency of $129,687 (10%).
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BACKGROUND
The electrical distribution systems at Plant Nos. 1 and 2 are critical to ensure power supply to all Orange County Sanitation District (Sanitation District) plant facilities at all times. The electrical distribution system includes distribution centers, power buildings, and electrical rooms throughout the plants. These facilities use switchgear and automatic transfer switches to distribute Southern California Edison (SCE), Central Generation System (Central Generation), and standby generator power.
RELEVANT STANDARDS
* 24/7/365 treatment plant reliability
PROBLEM
Plant No. 1 does not have an automated load-shedding system in place. In the event of an SCE outage, electrical maintenance staff at Plant No. 1 must reconfigure the electrical system located throughout the plant. If non-critical loads are not switched off in time, Central Generation is unable to maintain the load and shuts down. After a shutdown, staff must manually initiate restarting of equipment in a particular sequence to avoid overloading of the Central Generation. This is a time-consuming and inefficient means of operating the electrical distribution system, particularly during emergency events.
Plant No. 2 is in the process of adding an a...
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