面试题与答案

Load shedding is the intentional reduction of electric power to avoid a total blackout when the demand exceeds the available generation capacity. It helps in maintaining the balance between generation and demand.

Power factor is the ratio of real power (kW) to apparent power (kVA) in an AC circuit. It indicates how effectively electrical power is being converted into useful work and is represented as the cosine of the angle between voltage and current waveforms.

A busbar is a conductive bar that serves as a common connection point for multiple incoming and outgoing electrical circuits in a substation. It plays a crucial role in distributing electrical power and maintaining the stability of the system.

Transmission involves the bulk transfer of high-voltage electric power over long distances from power plants to substations. Distribution, on the other hand, is the delivery of lower-voltage power from substations to end-users, such as homes and businesses.

A relay is a protective device that detects abnormal conditions, such as overloads or faults, and triggers the isolation of the affected circuit. It plays a crucial role in maintaining system reliability and preventing damage to equipment.

Overhead power transmission lines are cost-effective and have lower losses but are susceptible to weather-related damage and visual impact. They are suitable for long-distance transmission but may face challenges in densely populated areas.

Renewable energy sources, such as solar and wind, play a crucial role in diversifying the energy mix and reducing dependence on fossil fuels. They contribute to sustainability goals and help mitigate environmental impact.

Power quality refers to the stability and reliability of the voltage and current supplied to electrical devices. Poor power quality can lead to equipment malfunctions, and measures are taken to ensure a consistent and high-quality power supply.