Substation 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

HV power fuses

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

A substation yard is one large equipotential zone.

Answer 6

True

Question 7

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 7

Mobile

Question 8

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

Answer 8

Oil

Question 9

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

Answer 9

disconnect switches

Question 10

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

Answer 10

False

Question 11

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

Answer 11

capacitors

Question 12

Control house lighting, heat, battery charger power, and other 120/240 volt substation needs are generally provided by a ? transformer.

Answer 12

Station Service

Question 13

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

Answer 13

series with

Question 14

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

Answer 14

2.4 kV to 34.5 kV

Question 15

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 15

reactors

Question 16

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

Answer 16

Converter

Question 17

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 17

I2R

Question 18

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

Answer 18

3

Question 19

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 19

static compensator

Question 20

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

Answer 20

damping

Question 21

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

Answer 21

True

Question 22

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

Answer 22

True

Question 23

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

Answer 23

Wave Traps