2006 Muttrah Incident Report - authority for electricity regulation, oman

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4 RETROFITTING AT MUTTRAH OLD STORES PRIMARY SUBSTATION 4.1 Substation Design and Layout The 11 KV switchboard at Muttrah Old Stores Primary Substation is of Brush manufacture and was installed in the late 1970s. The switchboard consists of two transformer bays fed by 16 MVA transformers from the 33 KV system, a bus coupler bay and eight feeder bays i.e. it consists of 11 cubicles coupled together. The layout of the 11 KV switchboard is shown in the diagram and photographs below. FIGURE 1 Muttrah Primary Substation Layout 12
FIGURE 2 Brush OCB Truck removed Muttrah Old Stores 11 KV Switchboard with the Bus Coupler OCB truck removed from its cubicle. FIGURE 3 Brush OCB Truck inserted Muttrah Old Stores 11 KV Switchboard showing the Al-Harthy feeder cubicle with the original Brush OCB truck in the inserted position. 13
Page 1 and 2: REPORT INTO THE INCIDENT AT MUTTRAH
Page 3 and 4: GLOSSARY OF TERMS The terms defined
Page 5 and 6: 1 INTRODUCTION AND SUMMARY OF FINDI
Page 7 and 8: 2 SCOPE OF INVESTIGATION AND METHOD
Page 9 and 10: 2.3 Methodology In preparing its re
Page 11: outages on the distribution system
Page 15 and 16: contracts were subsequently awarded
Page 17 and 18: 5 SEQUENCE OF EVENTS The sequence i
Page 19 and 20: The protection relay indications fo
Page 21 and 22: BUSHING SHUTTER FIGURE 4 Reconstruc
Page 23 and 24: FIGURE 7 Truck - Cubicle Interface
Page 25 and 26: the shutter mechanism is mounted is
Page 27 and 28: 6.3 Cause of the Incident Based on
Page 29 and 30: shortcomings in the trucks supplied
Page 31 and 32: Subsequent to the incident it emerg
Page 33 and 34: • That the design defects identif
Page 35: 10 RECOMMENDATIONS The inquiry make

2006 Muttrah Incident Report - authority for electricity regulation, oman

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