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Pacific Gas and Electric Company Issues December 8, 1998 Outage Investigation Report.



SAN FRANCISCO--(BUSINESS WIRE)--Jan. 25, 1999--Pacific Gas and Electric Company is instituting new mandatory work practices and procedures, adding operational checks, and expanding test programs throughout its transmission system, according to according to
prep.
1. As stated or indicated by; on the authority of: according to historians.

2. In keeping with: according to instructions.

3.
 a report filed today at the California Public Utilities Commission The California Public Utilities Commission (CPUC; also often commonly referred to as simply the PUC) [1] is a state Public Utilities Commission which regulates privately-owned utilities in the state of California, including electric power,  that details the results of an extensive internal investigation of the power outage Noun 1. power outage - equipment failure resulting when the supply of power fails; "the ice storm caused a power outage"
power failure

equipment failure, breakdown - a cessation of normal operation; "there was a power breakdown"
 affecting San Francisco San Francisco (săn frănsĭs`kō), city (1990 pop. 723,959), coextensive with San Francisco co., W Calif., on the tip of a peninsula between the Pacific Ocean and San Francisco Bay, which are connected by the strait known as the Golden  and San Mateo San Mateo (săn mətā`ō), city (1990 pop. 85,486), San Mateo co., W Calif., on San Francisco Bay; inc. 1894. It is a commercial and retail center with some high-technology manufacturing. San Mateo, Spanish for St.  County on December 8, 1998.

PG&E's internal investigation has confirmed that the outage resulted when a construction crew working on an equipment upgrade project at the San Mateo Substation failed to follow established procedures and practices, and improperly removed temporary protective grounds. Separately, a transmission operator at the substation then energized the lines, but failed to engage the protective relays associated with the lines. Without the local protective system in place, the electric current was sent to ground, and the system took a half second to isolate the fault instead of the one-tenth of a second that would normally be required.

This delay resulted in a sharp drop in transmission line voltages, and the transmission system into San Francisco then experienced large power fluctuations. As they are designed to do, protective systems at other substations and at the Hunters Point Hunters Point refers to the following places:
  • Hunters Point, San Francisco, California
  • Hunters Point, Queens, New York
  • Hunterspoint Avenue (LIRR station)
 and Potrero power plants separated from the transmission system to make sure that the fluctuations did not extend to other parts of PG&E's system, and that no damage occurred to equipment in San Francisco's electric facilities that could have delayed restoration of operations.

"Over the past six weeks, we have conducted a thorough review to identify what went wrong," said PG&E President and CEO (1) (Chief Executive Officer) The highest individual in command of an organization. Typically the president of the company, the CEO reports to the Chairman of the Board.  Gordon R. Smith. "Our study has confirmed that it was a combination of the failure to follow procedures and miscommunications. As I have said previously, there is no excuse for what happened, and more than inconveniencing our customers, we feel we did not live up to our own high standards for delivering service reliably and safely."

The utility's investigation has found that the restoration effort generally proceeded smoothly, and given the scope of the outage, was completed in a reasonable time. Some customers were restored in as little as one hour, and most were restored within six hours.

PG&E has worked and communicated extensively with the California Independent System Operator (CAISO CAISO California Independent System Operator ) from the outset, immediately notifying the CAISO of the outage. PG&E and the CAISO are using the lessons learned in this event to strengthen their communications.

The investigation has also found that the transmission system design is consistent with the requirements of the North American North American

named after North America.


North American blastomycosis
see North American blastomycosis.

North American cattle tick
see boophilusannulatus.
 Electric Reliability Council and the Western Systems Coordinating Council, and performed as designed given the initiating event that occurred. As a result of this finding, the company is not proposing modifications to the system design. Rather, actions PG&E is taking are focused on preventing such an initiating event.

The executive overview of PG&E's December 8 outage investigation report can be found on the company's website at www.pge.com. In addition, PG&E is filing a similar report today in response to a request by the California Public Utilities Commission.

For more information about PG&E, please visit our web site, http://www.pge.com
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No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1999, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

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Publication:Business Wire
Geographic Code:1USA
Date:Jan 25, 1999
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