FROM: James D. Herberg, General Manager
Originator: Rob Thompson, Assistant General Manager
SUBJECT:
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PLANT NO. 2 DISTRIBUTION CENTER H, 480V SWITCHGEAR UNDERVOLTAGE RELAY UPGRADE PROJECT
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Approve a Purchase Order Contract with Miron Electric Construction Corp. for Plant No. 2 Distribution Center H, 480V Switchgear Undervoltage Relay Upgrade Project, per Specification No. S-2021-1280, for a total amount not to exceed $198,200; and
B. Approve a contingency of $19,820 (10%).
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BACKGROUND
The Orange County Sanitation District (OC San) uses undervoltage relays in the electrical protection scheme and to automatically transfer loads to safely distribute 480 volt power. The undervoltage relays provide circuit protection in the event of voltage drop or short circuit condition.
RELEVANT STANDARDS
* Protect OC San assets
* 24/7/365 treatment plant reliability
* Maintain a proactive asset management program
PROBLEM
Plant No. 2 Distribution Center H was designed with three 480V switchgear lineups that utilize six GE MIV II/IV undervoltage relays. These GE Relays are now obsolete and replacement components are difficult to procure, which impacts the reliability of the switchgear to perform load protection and load transfer functions of critical loads at the Plant No. 2 Headworks. During an unplanned power loss/interruption event, critical process loads need to be relay-protected and automatically transferred to emergency power sources.
PROPOSED SOLUTION
Staff recommends awarding a Purchase Order Contract to Miron Electric Construction Corp. to replace two obsoleted GE MIV II and four obsoleted GE MIV legacy relays with six Schweitzer SEL 751 Feeder Protection Relays consistent with OC San engineering specifications.
TIMING CONCERNS
Proceeding expeditiously is desired to address obsolescence issues within critical switchgear equipment.
RAMIFICATIONS O...
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