Param Renewable Energy Interview Questions, Process, and Tips for Freshers

A solar inverter is a device that converts the DC electricity generated by solar panels into AC electricity for use in homes and businesses.

• Converts DC electricity from solar panels to AC electricity

• Allows for use of solar energy in homes and businesses

• Helps manage and optimize solar power production

• Examples: SMA Solar Inverters, Enphase Microinverters

Maintenance ensures equipment, machinery, or systems are kept in good working condition to prevent breakdowns and ensure optimal performance.

• Prevent breakdowns and extend equipment lifespan

• Ensure optimal performance and efficiency

• Reduce safety risks and downtime

• Save costs in the long run by avoiding major repairs or replacements

Protection of power transformer involves implementing measures to prevent damage or failure of the transformer due to various factors.

• Protection relays are used to detect abnormal conditions and isolate the transformer from the system.

• Overcurrent protection is used to prevent damage from excessive current flow.

• Differential protection compares the current entering and leaving the transformer to detect internal faults.

• Te...read more

Relays are devices that act as switches to control electrical circuits. They come in various types with different functions.

• Electromechanical relays: use electromagnets to mechanically operate the switch

• Solid-state relays: use semiconductor devices to switch the circuit on and off

• Time delay relays: introduce a time delay before switching the circuit

• Overload relays: protect electrical circuits from overloads by disconne...read more

Transformer testing includes routine tests, type tests, and special tests to ensure proper functioning and safety.

• Routine tests: include insulation resistance, turns ratio, winding resistance, and polarity tests.

• Type tests: include temperature rise, short-circuit withstand, impulse voltage, and dielectric tests.

• Special tests: include noise level, partial discharge, and harmonics tests.

• Testing is crucial to ensure trans...read more