Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

basic impulse insulation level (BIL)
a measurement of the impulse withstand capability of a piece of electric power equipment based on its ability to withstand 50% of impulses applied at the BIL voltage.
basic lightning impulse level (BIL)
the strength of insulation in terms of the withstand voltage crest value using a standard voltage level impulse.
BIL
basic lightning impulse level

See basic impulse insulation level
electric susceptibility
tensor relationship between the electric field vector and the electric polarization vector in a medium with no hysteresis. It is the polarization divided by the permittivity of free space and the electric
field in scalar media.
electromagnetic compatibility (EMC)
the ability of a system or equipment to operate within design tolerances in its intended environment, with adjacent systems and equipment, and with itself, so that the effect of any electromagnetic disturbances produced by the systems or equipment is reduced.
electromagnetic susceptibility
a device's failure to perform appropriately if there is an electromagnetic disturbance.
electromagnetic vulnerability (EMV)
the inability of a device, equipment, or system to perform without degradation when
subjected to electromagnetic environment of a specified power level and frequency range.
Global System for Mobile Communications (GSM)
a set of systems specifications that describe the Pan European digital mobile cellular radio system. This set of 13 recommendations describe service, synchronization, hardware, operating and maintenance characteristics for the system.
line impedance stabilization network (LISN)
a network designed to present a defined impedance at high frequency to a device under test, to filter any existing noise on the power mains, and to provide a 50 Ω impedance to the noise receiver.
magnetic permeability tensor
relationship between the magnetic field vector and the magnetic flux density vector in a medium with no hysteresis; flux density divided by the magnetic field in scalar media.
magnetic stabilization
the act of purposely demagnetizing a magnet with reverse fields or a change in temperature so that no irreversible losses are experienced when the magnet operates under similar conditions in the field.
magnetic susceptibility
the ratio of the magnetization to the applied external field.

Tensor relationship between the magnetic field vector and the magnetization vector in a medium with no hysteresis; magnetization divided by the permeability of free space and the magnetic field in scalar media. It is an indicator of how easily a material is magnetized and has no units in the SI system of units (pure number).
maintainability
the probability that an inoperable system will be restored to an operational state within the time t.
permeability
tensor relationship between the magnetic field vector and the magnetic flux density vector in a medium with no hysteresis; flux density divided by the magnetic field in scalar media. Permeability indicates the ease with which a magnetic material can be magnetized. An electromagnet with a higher permeable core material will produce a stronger magnetic field than one with a lower permeable core material.
Permeability is analogous to conductance, when describing electron flow through a material.
See reluctance
power system stabilizer
a control device that provides an additional input signal to the AVR to damp power system oscillations.
recoil permeability
the average slope of the minor hysteresis loop, which is roughly the slope of the major hysteresis loop at zero applied field (H ), and is most often used to determine the effect of applying and removing a demagnetizing field to and from a magnetic material.
reliability
the probability that a component or system will function without failure over a specified time period, under stated conditions.
stability
(1) the condition of a dynamic or closed-loop control system in which the output or controlled variable always corresponds, at least approximately, to the input or command within a limited range. In most devices, this is a measure of the inherent ability of the circuit to avoid internally generated oscillations.

In oscillators, stability denotes the ability of the circuit to maintain a stable internally generated amplitude and frequency. The circuit components, bias, loading, drive and environmental conditions, and possible variations therein, must be accounted for. See also Linville stability factor and Rollett stability factor.

(2) in electronic drives, the ability of a drive to operate a motor at constant speed (under varying load), without hunting (alternately speeding up and slowing down). It is related to both the characteristics of the load being driven and electrical time constants in the drive regulator circuits.
susceptibility
the part of the permittivity or permeability that is attributable to the electromagnetic behavior of the medium. In a linear, isotropic medium, the electric susceptibility is numerically equal to the relative permittivity minus one, and the magnetic susceptibility is equal to the relative permeability minus one. See also electric susceptibility.
transient stability
the ability of a power system to remain stable following a system disturbance.
Powered by The Filipino Engineer