2006 Muttrah Incident Report - authority for electricity regulation, oman

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The inquiry shall be conducted pursuant to the powers granted to the Authority under Article (22) para (3) of the Sector Law promulgated by Royal Decree No 78/2004 and shall require any information to be provided to it. The inquiry shall determine the causes of the incident and shall make recommendations to the Authority for any changes in safety procedures and working practices it considers necessary. Following the incident the Public Prosecutor’s Office agreed that the Authority’s inquiry would provide the technical input into its own investigations. 8
2.3 Methodology In preparing its report the inquiry decided to concentrate on the following aspects: a) The exact sequence of events leading up to the incident including the safety precautions in place; b) The reason for the flashover; c) The actions taken subsequent to the incident; d) The contract for the retrofitting of the Vacuum Circuit Breakers and the quality assurance aspects of the contract; e) The experience of the contractor concerned and experience of similar work carried out in Oman; and f) The immediate remedial actions required The inquiry sought independent technical advice from KEMA International and from Sultan Qaboos University to ensure a rigorous and thorough evaluation of technical matters. The inquiry also received full cooperation from the ABB Group including the results of an internal technical review carried out by ABB Italy. 9
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: 2 SCOPE OF INVESTIGATION AND METHOD
Page 11 and 12: outages on the distribution system
Page 13 and 14: FIGURE 2 Brush OCB Truck removed Mu
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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