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W A i c k r N c q u Y c _ RIVERSIDE PUBLIC UTILITIES Board Memorandum P U B L I C U I 1 L I T I E 5 BOARD OF PUBLIC UTILITIES DATE: September 16, 2011 ITEM NO: 6 SUBJECT: REPLACEMENT AND ADDITION OF REMOTE TERMINAL UNITS, LOAD TAP CHANGER CONTROLLERS,AND TRANSFORMER TEMPERATURE CONTROLLERS AT THE RfVERSIDE SUBSTATION -WORK ORDER NO. 1104235 ISSUE: Board of Public Utilities approval is requested for Work Order No. 1104235. RECOMMENDATION: That the Board of Public Utilities approve Work Order No. 1104235 in the amount of $300,000 for the replacement and addition of remote terminal units, load tap changer controllers,and transformer temperature controllers for switchgears and power transformers No. 4 and No. 5 at the Riverside Substation. BACKGROUND: Riverside Public Utilities' (RPU) Supervisory Control and Data Acquisition(SCADA)system has the capability of remotely monitoring and controlling high voltage substation equipment, such as circuit breakers and transformers, from the Utility Operations Center. SCADA collects important information through various electronic devices that report valuable information about the condition of circuit breakers, transformers and other electrical equipment in substations throughout the City of Riverside. Some common types of electronic devices used at RPU's electrical substations are Remote Terminal Units (RTU), Load Tap Changer Controllers(LTCC),Transformer Temperature Controllers(TTC), and Substation Automation Systems(SAS), RTUs are electronic devices used in general applications to monitor and control high voltage circuit breakers, transformers, and other substation equipment. SAS are used to gather, organize, and exchange large amounts of data over a fiber optic communication link from several electronic devices to SCADA. Unlike RTU or SAS devices, both the LTCC and TTC devices are specifically designed for transformer applications. LTCC are dedicated for monitoring and controlling transformer load tap changers which regulate a transformer's output voltage. TTCs monitor transformer oil and winding temperatures, control transformer cooling fans, and provide real-time transformer temperature data and alarms. Work Order No. 1104235 includes the following equipment changes at Riverside Substation: 1) 12 kV Switchgear No. 4: Replacement of obsolete RTU and SAS. 2) 12 kV Switchgear No. 5: Addition of new SAS. 3) Transformer No. 4: Replacement of obsolete LTCC, and addition of RTU and TTC. 4) Transformer No. 5: Replacement of obsolete LTCC, and addition of RTU and TTC. As noted above,same RTU, SAS, and LTCC will be replaced because their parts are obsolete. Replacement parts and technical expertise regarding these obsolete products are not readily available. Failure of these components will result in a loss of system data and limited operation so replacement is highly desirable.