Technology beginning with S

Smart Grid Technology
Click one of the letters above to go to the page of all terms beginning with that letter.
Scheduling Entity

An entity responsible for approving and implementing Interchange Schedules.

Scheduling Path

The Transmission Service arrangements reserved by the Purchasing-Selling Entity for a Transaction.

Sending Balancing Authority

The Balancing Authority exporting the Interchange.

Sink Balancing Authority

The Balancing Authority in which the load (sink) is located for an Interchange Transaction. (This will also be a Receiving Balancing Authority for the resulting Interchange Schedule.)

Smart Appliance

An appliance that includes the intelligence and communications to be automatic or remote-controlled based on user preferences or external signals from a utility or third party energy service provider. A smart appliance may utilize a Home Area Network to communicate with other devices in the customer's premise, or other channels to communicate with utility systems.

Smart Appliances And Equipment (Customer)

Home appliances and devices (i.e., thermostats, pool pumps, clothes washers/dryers, water heaters, etc.) that use wireless technology (i.e., ZigBee) to receive real-time data from the AMI system to control or modulate their operation.

Smart Meter - Commercial

A meter that records a commercial customer's electricity usage for time intervals of one hour or less, and can transmit that information to the utility without the need for a human meter reader. Depending on the feature set, the meter may also notify the utility of a power outage, and provide pricing or other information to the customer.

Smart Meter - Industrial

A meter that records an industrial customer's electricity usage for time intervals of one hour or less, and can transmit that information to the utility without the need for a human meter reader. Depending on the feature set, the meter may also notify the utility of a power outage, provide pricing or other information to the customer.

Smart Meter - Residential

A meter that records a customer's electricity usage for time intervals of one hour or less, and can transmit that information to the utility without the need for a human meter reader. Depending on the feature set, the meter may also notify the utility of a power outage, provide pricing or other information to the customer, or allow the utility to remotely switch electricity service on or off.

Smart Relays

Smart Relays monitor voltages, currents and frequency in the electrical system and send control signals to circuit breakers or switches. Smart relays can store measurement data and process the data to provide utilities with information about system conditions. The settings of smart relays can be adjusted automatically or remotely in response to changing conditions and control instructions. Some smart relays include synchrophasor technology and can act as phasor measurement units (PMUs).

Software - Advanced Analysis/Visualization

Systems installed to analyze grid information or help human operators.

Source Balancing Authority

The Balancing Authority in which the generation (source) is located for an Interchange Transaction. (This will also be a Sending Balancing Authority for the resulting Interchange Schedule.)

Special Protection System

An automatic protection system designed to detect abnormal or predetermined system conditions and take corrective actions other than and/or in addition to the isolation of faulted components to maintain system reliability. Such action may include changes in demand, generation (MW and Mvar), or system configuration to maintain system stability, acceptable voltage, or power flows. Also called Remedial Action Scheme.

Spinning Reserve

Unloaded generation that is synchronized and ready to serve additional demand.

Stability

The ability of an electric system to maintain a state of equilibrium during normal and abnormal conditions or disturbances.

Stability Limit

The maximum power flow possible through some particular point in the system while maintaining stability in the entire system or the part of the system to which the stability limit refers.

Supervisory Control And Data Acquisition

A system of remote control and telemetry used to monitor and control the transmission system.

Supervisory Control and Data Acquisition (SCADA) Communications Network

"SCADA systems are highly distributed systems used to control geographically dispersed assets, often scattered over thousands of square kilometers, where centralized data acquisition and control are critical to system operation." NIST Guide to Supervisory and Data Acquisition - SCADA and Industrial Control Systems Security (2007).

Supplemental Regulation Service

A method of providing regulation service in which the Balancing Authority providing the regulation service receives a signal representing all or a portion of the other Balancing Authority's ACE.

Surge

A transient variation of current, voltage, or power flow in an electric circuit or across an electric system.

Sustained Outage

The deenergized condition of a transmission line resulting from a fault or disturbance following an unsuccessful automatic reclosing sequence and/or unsuccessful manual reclosing procedure.

Synchrophasor Communications Network

A communications network to transport the digital information from phasor measurement units (PMUs) to where the data will be used. Typically implemented using a private wide-area network (WAN), this network can be any digital transport system that offers acceptable security and availability. Functional requirements have been developed as part of the North American SynchroPhasor Initiative (NASPI) to provide for flexible, fast, vendor-agnostic, and secure communication of phasor measurements.

System

A combination of generation, transmission, and distribution components.

System Model Calibration and Validation

Tools that utilize high resolution system measurements from phasor measurement unites (PMUs) to test the accuracy and performance of system models.

System Operating Limit

The value (such as MW, MVar, Amperes, Frequency or Volts) that satisfies the most limiting of the prescribed operating criteria for a specified system configuration to ensure operation within acceptable reliability criteria. System Operating Limits are based upon certain operating criteria. These include, but are not limited to: Facility Ratings, Transient Stability Ratings, Voltage Stability Ratings, System Voltage Limits