System Operation CH 2

Question 1

a formally recognized condition of a line, line section, or equipment that has been de-energized from all potential sources of energy by opening devices in the path or the potential flow of power.

Answer 1

clearance

Question 2

refers to any device, connector, or open that is utilized to isolate the line or piece of equipment from a potential source of energy

Answer 2

Clearance point

Question 3

provides a clear visual air gap between the source and load terminals of a device

Answer 3

visual clearance

Question 4

a condition in which all potential sources of energy are isolated by opening devices in the path of the potential flow of power. These devices are opened, checked open, locked if possible, and tagged.

Answer 4

Standard clearance

Question 5

a condition in which the main source of energy is opened, de-energizing the line or piece of equipment. However, no visual opening is provided, nor are personal protective grounds installed.

Answer 5

Safety clearance

Answer 6

Energy Sources

Question 7

the physical attachment of an approved visible tag on or near the device that has been opened for use as a clearance point.

Answer 7

Tagging

Question 8

refers to the task of physically installing a padlock through a mechanism in a manner which prevents the device from being closed.

Answer 8

locking

Question 9

An energy source connected to the system and not known by the system operator or the line crews in the field.

Answer 9

foreign generators

Question 10

In most schemes there is a primary protection function and a ___________ that will operate in the event that the primary function fails for some reason.

Answer 10

backup function

Question 11

The amount of fault current that a particular device is capable of interrupting.

Answer 11

Fault current interrupting rating

Question 12

The amount of normal load current that a particular device is capable of carrying and interrupting

Answer 12

Normal current carrying capacity rating

Question 13

To reduce congestion on electrical drawings and improve standardization of
relay functions, the ___________ has developed a standard numbering list of relay functions.

Answer 13

National Electrical Manufacturers Association (NEMA)

Question 14

What is the function of a relay?

Answer 14

Relays are devices that detect fault current and initiate the tripping of the circuit breakers or reclosers.