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W A T E R E N E R G Y L I F E P U B L I C U T I L I T I E S RIVERSIDE PUBLIC UTILITIES BOARD OF PUBLIC UTILITIES Board Memorandum DATE: SEPTEMBER 14, 2020 ITEM NO: 5 SUBJECT: RIVERSIDE SUBSTATION 15KV RELAY REPLACEMENT PROJECT — WORK ORDER NO. 2021755 FOR A TOTAL CAPITAL EXPENDITURE IN THE AMOUNT OF $900,000 ISSUE: Consider approval of Work Order No. 2021755 for a total capital expenditure of $900,000 for the Riverside Substation 15kV Relay Replacement Project. RECOMMENDATION: That the Board of Public Utilities approve Work Order No. 2021755 in the amount of $900,000 for the Riverside Substation 15kV Relay Replacement Project. BACKGROUND: Electrical substations (substations) are the joining of facilities transmission systems. Substations house critical equipment substation power transformers, equipment. All this equipment reliable and optimum operation. switchgears, power circuit brea within the substation boundaries between the distribution and and infrastructures such as kers, and protective relaying is vital for the electric grid's Relays are a critical component of electrical transmission and distribution protection system. Relays are devices that active and trigger the operation of line protecting equipment, including breakers and other switches in substations and related switchgear equipment. Electromechanical relays and control systems were the standards in the electrical industry until the 1980s. Since then, there has been a migration towards microprocessor -based relays and controls. Riverside Public Utilities (RPU) has standardized the use of microprocessor -based relays for all new installations and upgrades. 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. Replacement of electromechanical relays with microprocessor -based relays is essential to increase safety and system reliability.