Delivery Systems

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Resistance

Electrical resistance (or the resistance to the flow of electricity through a material) is measured in units called ohms (Ω). You can think of …

Safety ground

A safety ground is a temporary conductor that is installed to protect electric workers performing maintenance or repair on electrical lines or e …

Service conductor

A service conductor is the wire or set of wires that transmit electricity from a transformer on a distribution line to a customer facility. Serv …

Service configuration

The configurations for any specific customer’s electric service depends primarily on the equipment located within the customer premises and th …

Service voltage

The voltage configuration that is provided by the utility at the customer meter is called the service voltage. In many cases, two voltages are p …

Single-phase distribution lines

Distribution lines can be configured in different ways depending on how the lines are wired into the transformer at the substation. In a single- …

Single-phase feeder/tap

Single-phase feeders and taps are used to take power from three-phase lines and feed it to customers taking single-phase service.

Single-phase power

Single-phase power is what is used by most residential and small business customers because it is the most cost-effective way to serve their lim …

Single-phase service

Single-phase is a service configuration offered by electric utilities and is typically provided to residential and small commercial customers. I …

Small modular reactor (SMR)

New technologies in development promise much smaller nuclear reactors ranging in size from 2 to 300 MW. These smaller units could be installed a …

Smart grid

The term smart grid (also sometimes called the advanced grid) applies to deployment of various digital technologies at points throughout the tra …

Smart inverter

A smart inverter is an inverter that includes sophisticated power electronics that allow it to provide a variety of functions while compensating …

Smart meter

A smart meter is an electronic device that records electric energy consumption in intervals of an hour or less and communicates that information …

Specified minimum yield strength (SMYS)

When engineers design a steel gas line, they designate a required pipe minimum yield strength, often called the SMYS.

Spinning reserve

Spinning reserves are units (or portions of units) that are not putting energy onto the grid but are synchronized to the frequency of the system …

State estimator

A state estimator is a software program that describes the current state of an electrical transmission or distribution system.

Steel pipe fabrication

Regardless of the technique used to create the pipe, all steel line pipe is coated to protect if from corrosion and other damage.

Sub-meter

Sub-meters are meters installed behind a master meter. Master and sub-metering is common in tenant occupancies like office buildings, shopping c …

Substation

A set of equipment on an electrical system that transforms voltage from high to low, or vice versa, and may perform other functions such as dire …

Surge impedance loading (SIL)

Surge impedance loading is a quantity used by system operators as a benchmark to determine whether a transmission line is acting as a capacitanc …