Electricity

Electricity

A database referring to the existence of a flow of electric charge.

Industry: Utilities

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Electricity

Ratio correction

Electrical equipment; Electricity

A feature of digital relays that enables compensation to be carried out for a CT or VT ratio that is not ideal.

Residual current device (RCD)

Electrical equipment; Electricity

A protection device which is actuated by the residual current.

Reactance

Electrical equipment; Electricity

The opposition of inductance and capacitance to alternating current equal to the product of the sine of the angular phase difference between the current and voltage.

A component of apparent power (volt-amps) which does not produce any real power (watts) transfer (the sine of the phase angle between the current and the voltage). It is measured in VARs volt-amps ...

Real power

Electrical equipment; Electricity

The average value of the instantaneous product of volts and amps over a fixed period of time in an AC circuit.

Recloser

Electrical equipment; Electricity

A switching device that rapidly recloses a power switch after it has been opened by an overload. In reclosing the power feed to the line, the device tests the circuit to determine if the problem is ...