Review Incident Shin.. - authority for electricity regulation, oman

1. INTRODUCTION
On 27 August 2007, at 22.07h a fault on the 132 kV-line of the Oman Electricity Transmission
Company SAOC (OETC) from Wadi Jizzi to Shinas led to an interruption of the power
supply in the Shinas area. This area was completely without power until 07.35 h the following
day, when the supply was partly restored via the 33 kV feeders of Majan Electricity
Company SAOC (MJEC) using a rota load shedding scheme. The Shinas 132 kV grid station
was energized again by OETC at 23.55 h on 28 August 2007. After that MJEC restored
the supply to all customers, which was completed at 01.34 h on 29 August 2007.
The Authority for Electricity Regulation, Oman (the Authority) asked KEMA to identify the
technical reasons for the interruption and investigate the overall management of the incident
by OETC. The Authority is of the view that the time taken by OETC to restore supplies
was unduly excessive.
We have studied several documents, including the incident reports/sequence of events of
both OETC and MJEC. As background documents we used the Grid Code (vs. 1.000) and
the ‘Report on capital and operating expenditure requirements for the Oman electricity
transmission company for the period 2006 - 2010’ 1 .
Furthermore, we have interviewed representatives of both OETC and MJEC, including both
General Managers, OETC’s maintenance manager, representatives of OETC’s Load Dispatch
Center and responsible people on-site, such as OETC’s operation engineer and
MJEC’s local staff in the Sohar area.
This document reviews the event largely in chronological order. We start with a review of
the situation before the incident took place (chapter 2). After that, we review the activities
during and immediately after the incident in chapter 3. Chapter 4 covers all the restoration
and repair activities. Our concluding remarks are contained in Chapter 5.
1 by SKM for AER, July 2006
Review Incident Shinas August 2007 5 09.10.2007
vs. 2 (final)