06-10-2019 BPU RPT 11 - Laserfiche WebLink

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W A T E R E N E R G Y T I F F RIVERSIDE PUBLIC UTILITIES id& Board Memorandum P U B L I C U T I L I T I E S BOARD OF PUBLIC UTILITIES DATE: JUNE 10, 2019 ITEM NO: 11 SUBJECT: PLAZA AND RIVERSIDE LINE RELAY REPLACEMENT PROJECT — WORK ORDER NUMBER 1927495 IN THE AMOUNT OF $492,000 ISSUE: Approve Work Order Number 1927495 for the Plaza and Riverside Line Relay Replacement project in the amount of $492,000. RECOMMENDATION: That the Board of Public Utilities approve Work Order Number 1927495 for the Plaza and Riverside Line Relay Replacement project in the amount of $492,000. BACKGROUND: The Electric System Master Plan (ESMP) recommends replacing all electromechanical relays in the sub - transmission and distribution systems with microprocessor -based relays and implementing a Protection System Improvement Program based on a system condition assessment of the protection system. Relays are critical components of electrical transmission and distribution systems. Electromechanical relays and control systems were the standard in the electrical industry until the 1980's. Since then, there has been a migration towards microprocessor -based relays and controls. Electromechanical relays are prone to electrical and mechanical failures, require frequent maintenance, and have setting limitations compared to microprocessor -based relays, which perform the same protection operations, but with higher precision and reliability. Due to the aforementioned reasons, replacement of electromechanical relays with microprocessor -based relays is essential to increase safety and system dependability. Therefore, Riverside Public Utilities (RPU) has standardized the use of microprocessor -based relays for all new installations and upgrades.