ESP 22633 Electrical Substation Practices Question bank answer key.
Program Name and Code: Electrical Substation Practices (22633 )
Course Name and Code: EE 6I
Academic Year :
Semester: Sixth
ESP 22633 Electrical Substation Practices Question bank important questions
Q.1 Attempt any Five of the following.
a) Classify substations based on voltage level. b) State the need for a pole-mounted distribution substation.
c) Illustrate the function of the isolator switch.
d) List out any four protective devices needed in 132/33 kV substation. e) List the material used to enhance earthing resistance on rocky land. f) State the need for a gas-insulated substation
g) List any two advantages of the GIS substation.
Q.2 Attempt any Three of the following.
a) With a neat diagram explain the working of configured grid substation.
b) Describe the construction and working of the swing-out (Drop out) fuse.
c) Explain the precautions taken while carrying out maintenance of capacitor bank in
a substation.
d) Explain the working and need of capacitor voltage transformer with a neat sketch.
Q.3 Attempt any Three of the following.
a) List out personal protective equipment (PPEs) used while entering the substation with their respective applications
b) Draw a neat labeled single-line diagram of the pole-mounted substation, state the function of protective devices used for protection
c) Summarize the activities to be carried out for the maintenance of the oil circuit breaker.
d) Distinguish between system earthing and equipment earthing.
Q.4) Attempt any three of the following.
a) Explain the methods of improving earth resistance.
b) Difference between conventional earthing and chemical earthing.
c) Describe the procedure to perform the voltage breakdown test of transformer oil.
d) List the precautions taken while carrying out preventive maintenance of GIS.
e) Define partial discharge and explain its effect on the performance of GIS
Q.5) Attempt any Two of the following.
a) Determine the ratings of LA, CT, PT, DO fuse, and circuit breaker (with Justifications) for mounting of 500kVA, 11/0.4kV plinth mounted substation.
b) Illustrate the procedure to carry out preventive maintenance of 33/ 11 kV air break circuit breaker.
c) With a neat diagram explain the working and advantages of power line carrier communication.
Q.6) Attempt any Two of the following.
a) i) Differentiate between mat earthing and plate earthing ii) list the merits of mast protection.
b) Describe the causes of hot spot formation in the transformer and state the methods of identification.
c) Elaborate on the causes of fire in gas-insulated substations and list firefighting equipment mainly used based on the reason for the fire.