Voltech Junior Engineer Interview Questions, Process, and Tips

Testing of energy meters, CTs and PTs involves verifying their accuracy and functionality.

• Energy meters are tested to ensure they measure energy consumption accurately.

• CTs (Current Transformers) are tested to verify their current ratio and accuracy.

• PTs (Potential Transformers) are tested to verify their voltage ratio and accuracy.

• Testing may involve simulating different load conditions and measuring the output.

• Calibrat...read more

Energy meter can be tested on line mode at site using a portable test equipment.

• Use a portable test equipment to simulate the load and measure the output of the energy meter.

• Ensure that the test equipment is calibrated and accurate.

• Perform the test during normal operating conditions to get accurate results.

• Compare the readings with the manufacturer's specifications to determine if the energy meter is functioning proper...read more

CT can be tested at site with load condition using a test kit and a load bank.

• Use a test kit to measure the CT ratio and polarity

• Connect the CT to a load bank to simulate load conditions

• Measure the output voltage and current of the CT under load

• Compare the measured values with the CT specifications

• Repeat the test for different load conditions

• Ensure safety precautions are taken during the test

PT can be tested at load condition by applying the load and measuring the voltage and current.

• Apply the load to the PT

• Measure the voltage and current using appropriate instruments

• Calculate the power factor and accuracy of the PT

• Ensure that the PT is within the acceptable limits of error

• Repeat the test at different load conditions to ensure accuracy

Over current relay is set based on the load current and time characteristics.

• Determine the maximum load current and time characteristics

• Select the appropriate over current relay type and current rating

• Calculate the relay settings based on the load current and time characteristics

• Adjust the settings to ensure proper coordination with other protective devices

• Test the relay to ensure proper operation