Hitachi Cash Management Services Interview Questions and Answers

The first step would be to investigate the cause of the secondary core of ct being open while the feeder is still working on very less load.

• Check for any loose connections in the secondary core of ct

• Inspect for any damage or faults in the secondary core of ct

• Verify the load on the feeder to ensure it is within normal operating range

• Consult with colleagues or experts for further troubleshooting steps

High voltage testing standard as per IEC includes testing voltage for 33kV system and familiar testing kits.

• High voltage testing standard as per IEC includes IEC 60060-1 for high-voltage test techniques.

• Testing voltage for 33kV system voltage is typically around 70-80kV.

• Common testing kits for high voltage testing include insulation testers, voltage detectors, and partial discharge testers.

LIBBP and HIBBP stability and sensitivity refer to protection schemes for electrical systems. Implementing logic for one incomer and three outgoing feeders involves setting up coordination and communication between devices. BBP protection testing ensures the system operates correctly under fault conditions.

• LIBBP and HIBBP stability and sensitivity are important for ensuring reliable protection of electrical systems.

• Implementing logic for one incomer and three outgoing feeders...read more

ATS stands for Automatic Transfer Switch. It is used to automatically switch between primary and backup power sources.

• ATS is a device used to switch between primary and backup power sources in case of power failure.

• To configure ATS relay, you need to set the parameters such as voltage, frequency, and delay timings.

• Trip selection refers to the setting that determines when the ATS will switch between power sources based on certain conditions.

• Examples of trip selection criteria ...read more

Close block is a device used to short circuit the secondary of a current transformer (CT) during testing to prevent damage to the CT. No fuse or MCB is used on the CT circuit to avoid any interruption during testing.

• Close block is used to short circuit the secondary of a CT during testing to prevent damage.

• It ensures that the CT is not overloaded with excessive current during testing.

• No fuse or MCB is used on the CT circuit during testing to avoid any interruption in the curr...read more

I have 5 years of experience in substation network.

• I have worked on various substation projects, including design, testing, and commissioning.

• I have experience with different types of substation equipment and systems.

• I have successfully completed multiple substation network projects on time and within budget.