Electrical Engineering Transmission Lines Quiz

Key characteristics describing electrical transmission lines' behavior, including resistance, inductance, capacitance, and conductance.

Opposition to current flow in a transmission line, measured in ohms per unit length.

Measure of a transmission line's ability to store energy in a magnetic field when current flows, measured in henries per unit length.

Ratio of voltage to current in a traveling wave on a transmission line; calculated as the square root of inductance per capacitance ratio.

Speed of a signal traveling along a transmission line, related to inductance and capacitance.

The opposition a conductor offers to current flow, measured in ohms.

A material's inherent resistance to current flow; measured in ohm-meters.

A measure of a conductor's ability to store energy in a magnetic field; measured in henrys per meter

The inductance between two conductors caused by the magnetic field of each conductor affecting the other

The ability of the line to store electrical charge; measured in farads per meter.

A dimensionless factor crucial for calculating capacitance; takes into account the radii of the conductors involved in a transmission line configuration

Opposition to current flow in a transmission line, measured in ohms.

A material's opposition to current flow, measured in ohm-meters.

Ability of a 3-phase line to store magnetic energy, calculated per unit length.

Average distance between conductors in a 3-phase system.

Geometric average distance between conductors in a 3-phase system.

Ability of a transmission line to store electrical energy, measured per unit length.

Phenomenon where AC current flows predominantly at the surface of a conductor.

Calculating total resistance by multiplying the resistance of a single conductor by the number of conductors.

Repositioning of conductors in a transmission line to minimize inductive and capacitive coupling.

Changing conductor positions at intervals along a transmission line, often for long lines.

Current flow is concentrated near the surface of a conductor at higher frequencies, increasing effective resistance.

Skin effect is more noticeable at higher AC frequencies; lower frequencies have more uniform current distribution.

Changing the entire set of conductors (phase) at intervals, often for shorter lines.

An equivalent distance used for multiphase transmission line capacitance and inductance calculations.

Distance at which current density drops to about 37% of its surface value

Change in current distribution in conductors due to interaction of magnetic fields from nearby conductors.

Calculates average conductor distances to estimate GMD.

Multiple parallel conductors carrying AC current and their interacting magnetic fields.

A more accurate GMD calculation, considering 3D conductor positions.

Equivalent radius of a bundled conductor bundle used for calculation of inductance and capacitance.

Arrangement of conductors in a transmission line to equalize current distribution, minimizing losses.

Calculates GMR for symmetrical conductor arrangements.

Balance current distribution across all conductors to reduce both skin & proximity effects.

Calculates GMR for non-symmetrical conductor arrangements.

Increased power loss from heat due to non-uniform current distribution.

Methods used to reduce the impact of proximity effect. Example: using flat or rectangular conductors, or litz wire.

Unwanted interactions between conductors due to electric and magnetic fields.

δ = √(2 / (ωμσ)) where ω is angular frequency, μ is permeability, and σ is conductivity.

Two parallel circuits for power transmission, increasing capacity and reliability.

Multiple conductors grouped together for increased capacity and reduced losses.

Higher power transmission due to parallel circuits or bundled conductors.

Power loss due to ionization of air around high-voltage conductors.

A backup system in case one circuit fails; improving power supply stability.