Torrent Power Executive Engineer Interview Questions and Answers

Various ways of distribution transformer protection include overcurrent protection, differential protection, and earth fault protection.

• Overcurrent protection involves the use of fuses or circuit breakers to protect the transformer from excessive current.

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

• Earth fault protection detects any fault between the transformer winding and earth, and trips the circuit to prev...read more

The tests for concrete and steel include cube test for concrete and tensile test for steel. If the cube test fails, additional tests like rebound hammer test or ultrasonic pulse velocity test can be performed.

• Concrete test: Cube test is performed to determine the compressive strength of concrete. A cube specimen is prepared and subjected to compressive load.

• Steel test: Tensile test is conducted to measure the strength and ductility of steel. A steel specimen is subjected to t...read more

The size of dog conductor depends on the current carrying capacity and the voltage rating of the electrical system.

• The size of the dog conductor is determined by the electrical load it needs to carry.

• The current carrying capacity of the conductor is directly proportional to its size.

• The voltage rating of the electrical system also plays a role in determining the size of the conductor.

• For example, a 20-ampere circuit requires a 12-gauge conductor, while a 30-ampere circuit req...read more

Earthing is the process of connecting the metallic parts of an electrical appliance to the earth plate.

• Plate Earthing

• Pipe Earthing

• Rod Earthing

• Strip Earthing

• Earthing through Water Mains

• Earthing through Earth Electrodes

• Earthing through Foundation

• Plate Earthing with Pipe

• Chemical Earthing

Transmission and distribution refer to the processes of delivering electricity from power plants to consumers.

• Transmission involves high voltage lines to carry electricity over long distances

• Distribution involves lower voltage lines to deliver electricity to homes and businesses

• Transformers are used to step up or step down voltage as needed

• Substations are used to switch and control electricity flow

• Smart grids use advanced technology to improve efficiency and reliability

Pipe earthing is done by connecting the pipe to a copper electrode buried in the ground.

• Select a suitable location for the copper electrode

• Dig a hole and insert the copper electrode into it

• Connect the pipe to the copper electrode using a copper wire

• Ensure that the connection is tight and secure

• Cover the hole with soil and water it to ensure good contact between the electrode and the soil

Buckley relay is a protective relay used in power systems to detect faults and prevent damage to equipment.

• It is a type of directional overcurrent relay.

• It operates based on the principle of phase comparison.

• It is used to protect generators, transformers, and transmission lines.

• It is named after its inventor, W. H. Buckley.

• It is commonly used in high voltage power systems.