English Glossary

Since 02.06.2017

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A compound consisting of chains of large molecules, or macromolecules, composed of many repeated subunits.

polypropylene gylcol

An organic compound (alcohol) used for freeze protection


La cantidad de trabajo realizado o energía transferida por unidad de tiempo. La unidad en el SI es watt (W) o Joule per second (J/s).

potencia activa

Potencia (en watts) usado por un dispositivo para producir trabajo. Término utilizado cuando es necesario distinguir entre potencia aparente, potencia compleja y sus componentes, y la potencia activa y reactiva.

potencia aparente

Es el producto de la tensión aplicada y la corriente en un circuito de CA. La potencia aparente, o volt-amperios, no es la potencia verdadera del circuito ya que en su cálculo no se tiene en cuenta el factor de potencia. Expresado en volt-amperios.

potencia específica de turbinas eólicas

Potencia nominal del generador (W) / Área de barrido del rotor (m2)

potencia máxima

La cantidad de energía eléctrica que un módulo fotovoltaico producirá en Condiciones normales de prueba (normalmente, 1.000 W/m2 y 25 ⁰C de temperatura de la celda), expresada en unidades de vatio-pico (kWp) o megavatio-pico (MWp).

potencia mecánica

Trabajo mecánico por unidad de tiempo.

potencia nominal

Potencia de una turbina eólica a una cierta velocidad de viento nominal.

potencia reactiva

Un componente de potencia aparente (volt-amperes) que no produce potencia real (watts). Se mide en VARs (volt-amperes reactivos).

potential induced degradation

"Potential induced degradation (PID) is an undesirable property of some solar modules. Potential induced degradation, as the designation implies, occurs when a module’s voltage potential and leakage current drive ion mobility within the module between the semiconductor material and other elements of the module (e.g. glass, mount and frame), thus causing the module’s power output capacity to degrade.


Power is the rate of doing work. It is equivalent to an amount of energy consumed per unit time. In the SI unit is the watt (W), or the joule per second (J/s).

power canal

An open channel the purpose of which is to transport water

power curve

Graph that depicts the power output of a wind turbine as a function of wind speed. The power curve is one of the most important criteria for selecting the optimum wind turbine for specific wind conditions at selected sides.

power factor

(also: cos(phi), cos phi, cos.phi) - The power factor which is defined as the ratio of active power and apparent power. At the same time it is the phase shift in AC power systems, the cosine of the angle phi which is the angle between current and voltage.

power gradients

Gradients in power output.

power limitation

Power limitation prevents wind turbine performing above design criteria.

power purchase agreement

Contract with a large customer to purchase electricity from a power plant. Usually the most important type of contract relating to the construction and operation of a power plant.

power quality

Quality of the voltage in a power system. Any deviation from a pure sinusoidal voltage shape with constant amplitude and frequency is considered to be negative with regard to the quality of the voltage.

Power System Simulator for Engineering (power system analysis software released by Siemens)

PSS\E is a solftware used in the power industry for electric transmission system analysis and planning.

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