SLTC ELECTRICAL SYSTEMS TEST 2
EXAM QUESTIONS AND ANSWERS.
VERIFIED 2026.
Substation - ANS An integral part of the power system, where the voltage is transformed
from a higher voltage to a lower voltage or the reverse using transformers
What does a typical substation contain? - ANS 1.) Termination structures
2.) High-voltage switchgear
3.) One or more power transformers
4.) Low voltage switchgear
5.) Surge protection
6.) Controls
7.) Grounding system
8.) Metering
How many basic purposes does a sunstation serve? - ANS Three
Substation purpose one - ANS Switching equipment and circuit in and out of the system- This
is accomplished by circuit breakers and associated protective relaying equipment and by
isolating devices, such as disconnect switches
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Substation purpose two - ANS Voltage transformation- i.e. stepping up or stepping down
voltages in the system. This is accomplished by the main component of the substation - the
transformer
Substation purpose three - ANS Voltage Control- This is accomplished by shunt reactors
(mainly on the high voltage system), shunt capacitors, voltage regulators, "load tap changing"
transformers, etc.
The ground grid is a critical element of the substation and is designed to provide the following
functions - ANS 1.) Provide a path to ground for lightning
2.) Provide a ground for all substation equipment
3.) Ensure the safety of working in the station by limiting the ground potential differences
4.) Ensure the safety of the public who may be near the fence during a fault condition
5.) Provide a ground source for all lines coming in and out of the substation
Environmential Considerations - ANS Apperance, sound, oil spill containment
Bus conductors - ANS The substation high and low voltage buses form the common collecting
point for receiving and redistributing the power.
Bus conductors are usually _____ and made of ________ - ANS Heavy, Aluminum
Varying Bus conductor shapes - ANS Flat bus "bars" and round conductors
Power transformers - ANS They can contain large amounts of mineral oil. Most new
transformers are single three-phase units and can be very large, requiring special transportation
from the manufacturer to the site.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
EXAM QUESTIONS AND ANSWERS.
VERIFIED 2026.
Substation - ANS An integral part of the power system, where the voltage is transformed
from a higher voltage to a lower voltage or the reverse using transformers
What does a typical substation contain? - ANS 1.) Termination structures
2.) High-voltage switchgear
3.) One or more power transformers
4.) Low voltage switchgear
5.) Surge protection
6.) Controls
7.) Grounding system
8.) Metering
How many basic purposes does a sunstation serve? - ANS Three
Substation purpose one - ANS Switching equipment and circuit in and out of the system- This
is accomplished by circuit breakers and associated protective relaying equipment and by
isolating devices, such as disconnect switches
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Substation purpose two - ANS Voltage transformation- i.e. stepping up or stepping down
voltages in the system. This is accomplished by the main component of the substation - the
transformer
Substation purpose three - ANS Voltage Control- This is accomplished by shunt reactors
(mainly on the high voltage system), shunt capacitors, voltage regulators, "load tap changing"
transformers, etc.
The ground grid is a critical element of the substation and is designed to provide the following
functions - ANS 1.) Provide a path to ground for lightning
2.) Provide a ground for all substation equipment
3.) Ensure the safety of working in the station by limiting the ground potential differences
4.) Ensure the safety of the public who may be near the fence during a fault condition
5.) Provide a ground source for all lines coming in and out of the substation
Environmential Considerations - ANS Apperance, sound, oil spill containment
Bus conductors - ANS The substation high and low voltage buses form the common collecting
point for receiving and redistributing the power.
Bus conductors are usually _____ and made of ________ - ANS Heavy, Aluminum
Varying Bus conductor shapes - ANS Flat bus "bars" and round conductors
Power transformers - ANS They can contain large amounts of mineral oil. Most new
transformers are single three-phase units and can be very large, requiring special transportation
from the manufacturer to the site.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
