English Glossary


Since 02.06.2017

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S

substrate

Input material for a process, also called feedstock.

super-synchronous

Speed range higher than the synchronous speed.

supervision control and data acquisition

Supervisory control and data acquisition (SCADA has the tasks control plants and to monitor, collect, store and analyse operating data.

supply side energy efficiency

Energy efficiency measures by utilities that reduce the losses in power generation and transmission processes. This leads to an increase of the supply of final energy (e.g. electric power at the consumer’s place), at a constant level of primary energy supply.

sustainable

An ecosystem condition in which biodiversity, renewability and resource productivity are maintained over time.

SVC

static VAR compensator

swap

An arrangement in which two entities lend to each other on different terms, for example, in different currencies or at different interest rates, fixed or floating.

swept rotor area

Area swept by the rotating blades of a wind turbine.

Sydney tube

A double walled evacuated glass tube

synchronous generator

Electrical machine which generates electrical power and carries a DC current for the magnetisation in the rotor. Thus the speed of the generator is synchronously to the grid frequency.

synchronous machine

An alternating current machine in which the frequency of the generated voltages and the speed of the machine are in a constant ratio.

System Average Interruption Duration Index

An indicator commonly used as a reliability indicator by electric power utilities. SAIDI is the average outage duration for each customer served. It is the sum of all customer interruption durations divided by the total number of customers served. Measured in units of time, hours per year or minutes per year.

systematic bias

A systematic deviation that has a non-zero average. Can be caused, for example, by errors in measurement devices. (syn. systematic error )

systematic error

A systematic deviation that has a non-zero average. Can be caused, for example, by errors in measurement devices. (syn. systematic bias )


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