3-5-3 Substations - Equipment Identification

Question 1

This lesson presents __?__ major installation steps when installing substation equipment.

Answer 1

7

Question 2

The minimum separation between bare live conductors in a substation (phase-to-phase) for 69 kV is __?__.

Answer 2

31”

Question 3

The minimum clearance for 115 kV from a live conductor to the substation lattice structure is __?__.

Answer 3

42”

Question 4

Sulfur hexafluoride (SF6) gas is a common arc quenching medium used in new substation __?__.

Answer 4

circuit breakers

Question 5

SF6 gas __?__ and will displace the air at the bottom of a confined space.

Answer 5

is heavier than air

Question 6

Substation breakers are often defined by their __?__ and their type of operating mechanism.

Answer 6

insulating medium

Question 7

Substation circuit breakers can be operated by __?__ or __?__ controls.

Answer 7

AC/DC

Question 8

In new substations of 500 kV, individual single-phase transformers are used because 3-phase transformers at these voltages are extremely large and expensive.

Answer 8

True

Question 9

Disconnects in a substation cannot be used as grounding devices.

Answer 9

False

Question 10

Post insulators found in modern substations are normally porcelain or polymeric.

Answer 10

True

Question 11

Step regulators normally provide 5% or __?__ regulation.

Answer 11

10%

Question 12

In a five percent substation step regulator, there are a total of __?__ steps.

Answer 12

16

Question 13

The purpose of installing capacitors in a substation is to reduce __?__.

Answer 13

line losses

Question 14

After switching a substation capacitor, wait at least __?__ minutes before applying a ground.

Answer 14

5

Question 15

The reactor used to counter phase-to-ground capacitance is connected phase-to-ground and is called a(n) __?__ reactor.

Answer 15

shunt

Question 16

The most common type of battery used for direct current power in a substation is the __?__ cell.

Answer 16

lead-acid

Question 17

In substation metering, a VT and a PT are two different types of instrument transformers.

Answer 17

False

Question 18

A substation __?__ is used on primary high voltage lines and buses to produce a lower voltage that is an exact fractional representation of the primary voltage.

Answer 18

coupling capacitor

Question 19

The most common type of substation is called a(n) __?__-insulated substation.

Answer 19

air

Question 20

An electrical line inside a substation yard made out of an aluminum-alloy pipe is called a __?__.

Answer 20

bus

Question 21

A(n) __?__ is used in a substation to filter out high-frequency communication signals on the power conductors.

Answer 21

wave trap

Question 22

A thermography (infrared) survey of a substation will point out any connections, splices, and switch components that are hot.

Answer 22

True