Rectifiers

Question 1

Inverter/rectifiers are usually housed in a building called the ? .

Answer 1

valve hall

Question 2

The four major grids in North America that could be tied together to form a true North American grid are the east grid, west grid, Texas grid, and the ? grid.

Answer 2

Quebec

Question 3

DC rectifier stations can tie two AC grids together because DC has ? phase angle.

Answer 3

no

Question 4

A DC rectifier station can only tie two grids together if they have the same exact frequency.

Answer 4

False

Question 5

A design with three 500-kilovolt AC lines carrying 3,000 megawatts could be redesigned using an HVDC 3,000-megawatt equivalent with a right-of-way width reduction of ? .

Answer 5

2/3

Question 6

AC has lower losses for a given length of line than DC.

Answer 6

false

Question 7

One advantage of using DC in transmission lines is that its constant voltage is ? the peak voltage in an AC line.

Answer 7

lower than

Question 8

Renewable energy farms are good candidates for connecting to an HVDC system.

Answer 8

True

Question 9

One disadvantage of an HVDC transmission line is that it cannot be as readily or economically tapped as an AC transmission line.

Answer 9

True

Question 10

HVDC presents an opportunity to effectively manage the power grid by means of controlling the direction of power flow and the ? .

Answer 10

power magnitude

Question 11

A device that converts DC to AC is called a(n) ? .

Answer 11

inverter

Question 12

The mercury arc valve (mercury vapor rectifier) was invented in ? .

Answer 12

1913

Question 13

A rectifier modifies the output current so that it flows in only one direction.

Answer 13

True

Question 14

The first thyristor rectifier was brought online in ? .

Answer 14

1968

Question 15

The reference discusses ? modern ways of converting AC-DC-AC for HVDC transmission systems.

Answer 15

3

Question 16

Until the 1950s, when the contact and diode rectifiers were developed, the ? rectifier was the preferred type.

Answer 16

mercury arc

Question 17

The most common type of HVDC link for connecting unsynchronized grids in long haul power transmission and undersea cables is the ? HVDC link.

Answer 17

station-to-station

Question 18

In most converter stations, two converters in series are connected to the main transformer from a wye connection only.

Answer 18

False

Question 19

When two AC-to-DC converters are housed in the same building and the HVDC transmission exists only within the building, it is called a ? link.

Answer 19

back-to-back

Question 20

The largest HVDC transmission system in the world transmits 6,400 megawatts of power at ? for a distance of more than ? .

Answer 20

800Kv/1,200mi