Agenda Packet Cc - regular meeting 8/28/1989

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U. Transportation Care is exercised during the transportation of oil - filled equipment. Special care is taken when hand- ling damaged equipment. Preventive Measures Preventive and early -warning measures may be categorized into three areas: substation inspection, substation trouble alarms and substation design. A. Substation Inspections 311.' substations are periodically inspected by :�•erators, troublemen or other experienced person- nel. The frequency of inspection is dependent on station size and significance; it may be daily, thrice weekly, ov weekly. Additionally, main- tenance crews, electrical mechanics, and various supervisory personnel frequent the stations. All personnel are trained on the important- --)f report- ing any abnormal conditions, includi oil dis- charges. Signs posted in the subst,�ions alert personnel to report all substation oil discharges in excess of five gallons to ERAD for follow up. B. Substation Trouble Alarms Most oil -filled electrical equipment is equipped with oil level gauges. Oil -filled transformers are equipped with both level and gas pressure gauges. In larger substations, these gauges are connected to remote alarm systems which will alert personnel in the trouble dispatch centers that the trans- former has developed a problem. Personnel are then promptly dispatched to determine the casse of the alarm. Any substantial loss of oil in energized electrical equipment results in the automatic shut- down of the equipment and electrical o,itages to our customers. In either case, we receive an early indication of problems that stem from an oil discharge. C .bst:: ` ion gn abstations, inherently, have been designed with many features teat minimize the possibility of oil discharges reaching navigable water and/or c;round water. 1. The pnysical dimensions of substations are usually large in relation to the volume of oil. DISK 10/(DPO-B-4)/SPC4 - 4 -