sub equipment overview

Question 1

The type of substation located near the end user is the ? substation.

Answer 1

distribution

Question 2

A generating station will typically have a(n) ? substation located nearby.

Answer 2

step up transmission

Question 3

A substation houses ? that protect the outgoing distribution feeders.

Answer 3

reclosers

Question 4

A rural substation is normally more complex in construction than an urban substation.

Answer 4

false

Question 5

Sulfur hexafluoride (SF6) is used as a(n) ? medium in substation switchgears.

Answer 5

arc quenching

Question 6

In remote locations, the economics of building double-bank substations to provide system reliability is not always an option. ? substations can be used to provide backup.

Answer 6

mobile

Question 7

Of the various types of arc-quenching mediums used in distribution circuit breakers, ? circuit breakers have been the most common.

Answer 7

oil

Question 8

When substation equipment must be de-energized to perform maintenance, ? provide visible open points.

Answer 8

disconnect switches

Question 9

Substation transformers are only equipped with off-load tap changers.

Answer 9

false

Question 10

The pieces of equipment in a substation that are isolated from a ground by being mounted on insulators are ?

Answer 10

capacitors

Question 11

In a substation, disconnect switches are in ? the circuit breakers.

Answer 11

series with

Question 12

Typically, distribution substation feeders deliver power in voltages from ? , depending on the needs of the area being served.

Answer 12

2.4 kV to 34.5kV

Question 13

Inductive reactance is sometimes needed to offset the capacitive reactance generated by long EHV transmission lines. This electrical property can be added to the system with ?

Answer 13

reactors

Question 14

At the beginning of overhead DC lines, submarine DC lines, or short DC lines between two different systems, ? substations are built.

Answer 14

converter

Question 15

Electrical transmission lines operate at high voltages to reduce the power loss. The formula used to calculate for the power loss on lines is ?

Answer 15

I^2R

Question 16

Substations can be built in many types, but there are ? basic types.

Answer 16

3

Question 17

Substation equipment can add capacitive or inductive reactance to the grid. To adjust the reactive power (VARS) up and down as needed, ? reactors are teamed up with capacitors.

Answer 17

static compensator

Question 18

To reduce the high inrush of current when capacitor banks are switched into service, ? reactors are connected in series with the load.

Answer 18

damping

Question 19

The word “substations” came into use because they were connected to only one power station and were subsidiaries of that power station.

Answer 19

true

Question 20

A power line carrying 66 kilovolts is classified as being of sub-transmission voltage.

Answer 20

true

Question 21

When powerline carrier communication (PLCC) systems are being used, ? are connected in series with the circuit.

Answer 21

wave traps