SUBSTATION SYSTEM PROTECTION 2025
UPDATED ACTUAL EXAM QUESTIONS AND
CORRECT ANSWERS
System protection - CORRECT ANSWERS the coordination and application of key
equipment so that it functions in a manner that ensures the reliability and safety of a system.
Protection scheme - CORRECT ANSWERS Used to indicate a certain application and
coordination of equipment for a specific system.
Do you and your co-workers performance at your job affect the overall reliability of the system?
- CORRECT ANSWERS yes
In the past what devices were considered part of the system protection? - CORRECT
ANSWERS Circuit breakers, relays, and sectionalizers
In the past were fuses considered part of the protection scheme? - CORRECT
ANSWERS no
SCADA stands for - CORRECT ANSWERS Supervisory control and data acquisition.
System protection must ;be designed to what? - CORRECT ANSWERS Isolate lines and
equipment from both faulted conditions and abnormal conditions.
What are the basic objectives of system protection? - CORRECT ANSWERS Protect public
by reducing exposure. Protect workers working on lines and equipment.
, What are the basic objectives of system protection? - CORRECT ANSWERS Minimize
damage to equipment and lines, Minimize outage numbers and time,
What are the basic objectives of system protection? - CORRECT ANSWERS Minimize
consumer damage and maintain voltage and frequency, Maintain reliability by minimizing fault
potential and the affects to additional lines
What is a fault condition? - CORRECT ANSWERS A condition where a short circuit has
occurred on a line or piece of equipment.
What is an abnormal condition? - CORRECT ANSWERS A condition such as high voltage,
low voltage, excessive current, incorrect frequency, single phasing.
What must de-enrgize the line in the case of abnormal conditions? - CORRECT
ANSWERS System Protection
A fault that is sustained and cannot be cleared without repair. - CORRECT
ANSWERS Permanent fault
A fault that can be cleared by momentarily de energizing the line. OCR's and breakers usually
clear these faults. - CORRECT ANSWERS Temporarty faults
Car accidents cause more of these types of faults then any other problem. - CORRECT
ANSWERS two phase to ground, and three phase to ground.
The majority of faults on a power system occur where, and are of what class and type? -
CORRECT ANSWERS On the structure, temporary, phase to ground.
UPDATED ACTUAL EXAM QUESTIONS AND
CORRECT ANSWERS
System protection - CORRECT ANSWERS the coordination and application of key
equipment so that it functions in a manner that ensures the reliability and safety of a system.
Protection scheme - CORRECT ANSWERS Used to indicate a certain application and
coordination of equipment for a specific system.
Do you and your co-workers performance at your job affect the overall reliability of the system?
- CORRECT ANSWERS yes
In the past what devices were considered part of the system protection? - CORRECT
ANSWERS Circuit breakers, relays, and sectionalizers
In the past were fuses considered part of the protection scheme? - CORRECT
ANSWERS no
SCADA stands for - CORRECT ANSWERS Supervisory control and data acquisition.
System protection must ;be designed to what? - CORRECT ANSWERS Isolate lines and
equipment from both faulted conditions and abnormal conditions.
What are the basic objectives of system protection? - CORRECT ANSWERS Protect public
by reducing exposure. Protect workers working on lines and equipment.
, What are the basic objectives of system protection? - CORRECT ANSWERS Minimize
damage to equipment and lines, Minimize outage numbers and time,
What are the basic objectives of system protection? - CORRECT ANSWERS Minimize
consumer damage and maintain voltage and frequency, Maintain reliability by minimizing fault
potential and the affects to additional lines
What is a fault condition? - CORRECT ANSWERS A condition where a short circuit has
occurred on a line or piece of equipment.
What is an abnormal condition? - CORRECT ANSWERS A condition such as high voltage,
low voltage, excessive current, incorrect frequency, single phasing.
What must de-enrgize the line in the case of abnormal conditions? - CORRECT
ANSWERS System Protection
A fault that is sustained and cannot be cleared without repair. - CORRECT
ANSWERS Permanent fault
A fault that can be cleared by momentarily de energizing the line. OCR's and breakers usually
clear these faults. - CORRECT ANSWERS Temporarty faults
Car accidents cause more of these types of faults then any other problem. - CORRECT
ANSWERS two phase to ground, and three phase to ground.
The majority of faults on a power system occur where, and are of what class and type? -
CORRECT ANSWERS On the structure, temporary, phase to ground.
