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W A T E R E N E R G Y L I F E <br />RIVERSIDE PUBLIC UTILITIES <br />P U B LIC UTILITIES Board Memorandum <br />BOARD OF PUBLIC UTILITIES DATE: SEPTEMBER 13, 2021 <br />SUBJECT: ROHR SUBSTATION PROTECTION SYSTEM UPGRADE PROJECT WORK <br />ORDER 2123497 IN THE AMOUNT OF $485,000 <br />ISSUE: <br />Consider approval of the capital expenditure for Work Order No. 2123497 in the amount of <br />$485,000 for the Rohr Substation Protection Upgrade Project. <br />RECOMMENDATION: <br />That the Board of Public Utilities approve the capital expenditure for Work Order No. 2123497 in <br />the amount of $485,000 which includes all design, construction, procurement, testing and <br />commissioning and construction support for upgrading the protection and automation systems at <br />Rohr Substation. <br />BACKGROUND: <br />Riverside Public Utilities (RPU) has an ongoing protective relay replacement program that <br />identifies and proactively replaces substation protective relays, automation, and control <br />equipment. The program is driven by number of factors including the age of the relay, relay <br />obsolescence, level of effort to maintain a complex and unique relay model and system criticality. <br />RPU's Substation Engineering and Test Group identified the relays at Rohr Substation for <br />replacement. The Rohr substation is located in the western area of the City, just north of Cypress <br />Avenue at the end of Picker Street. The relays the substation have reached the end of their useful <br />life while some are obsolete and are no longer cost effective to maintain because of their <br />uniqueness and complexity. <br />Protective relays are critical components of the electrical transmission and distribution systems. <br />The function of a protective relay is to detect and locate an electrical fault and issue a command <br />to the associated circuit breaker to isolate the faulty section of the system. <br />Protective relays come in two forms: electromechanical and microprocessor -based relays. <br />Electromechanical relays and control systems were the standards in the electrical industry until <br />the 1990s. Since then, there has been a migration towards microprocessor -based relays and <br />controls. Electromechanical relays are more prone to electrical and mechanical failures, require <br />frequent maintenance, and have setting limitations when compared to microprocessor -based <br />relays. Microprocessor relays perform the same protection operations, but with higher precision <br />