Distribution of lengths of power outages

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Abstract: Society has become increasingly dependent on electricity, so power system reliability is of crucial importance. However, while underinvestment leads to an unacceptable number of power outages, overinvestment will result in costs that are too high for society. The challenge is to find a socioeconomically adequate level of risk. In this risk assessment, not only the probability of power outages, but also the severity of their consequences should be included. A risk assessment can be performed from either the perspective of customers or the perspective of the grid owner, depending on whether the consequences faced by customers or the grid owner are considered. Consequences of power outages are usually measured through interruption costs. Examples of interruption costs for the grid owner are customer compensations and loss of goodwill. Examples of interruption costs for customers are retail losses for commercial customers and loss of heating and lighting for residential...

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S&C Electric Co. now offers service center configurability for TripSaver II Cutout-Mounted Recloser, a self-healing solution that reduces the scope and duration of power outages on lateral distribution lines. The new feature will make it easier for utilities to apply this product on their systems.

TripSaver II is an economical solution for bringing self-healing capabilities to secondary overhead distribution lines. In the event of a short circuit, it will interrupt the fault current and then reclose up to three times to determine if the fault is still present. If the fault remains after the reclosing cycles, the device will open and provide a visible gap in the power system, helping to isolate the damaged section of the grid and making it easier for utility personnel to locate the fault physically and make repairs.

"Many utilities have difficulty justifying the expense of a full self-healing solution on lateral distribution lines, because the loads impacted by...

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Distribution automation (DA) optimizes a utility’s operations and directly improves the reliability of its distribution power system. Adding targeted distribution automation capabilities can be economical when they are an extension of your existing SCADA investments and the communication infrastructure. The success or failure of an automation program hinges on proper selection of equipment and communications to seamlessly integrate data into the utility control room. The key is to choose equipment that leverages your current assets wherever possible. With the latest in high speed communication technology, there has never been a better time for utilities to extend their automation beyond the substation.

Power System Engineering, Inc. (PSE) has years of experience designing a wide range of DA applications and systems for utilities, such as applications that include automatic sectionalizing and SCADA controlled switching. Known for our experience with automation projects and...

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Stay clear of power and gas lines

Whether you are pruning trees, cleaning gutters or hanging Christmas lights, it’s vital to stay away from all power lines, including the service wire from the pole to your home.

Performing any work near power lines can be dangerous. Qualified contractors have special training and use insulated tools to avoid harm when pruning. Without the proper training and tools, a person can be injured or even killed.

The California Occupational Safety and Health Administration (Cal/OSHA) requires training and qualification of persons working within specific distances of overhead power lines. For details, see Title 8 of the California Code of Regulations, Articles 37 and 38, Electrical Safety Orders. Only PG&E’s line clearance qualified contractors can work near power lines. Hiring an unqualified tree contractor can also put you at legal risk.

PG&E can help you prune your trees near power lines safely. We can create a safe distance...

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