HVDC Quiz1

High Voltage DC (HVDC) transmission is mainly used for

• Bulk power transmission over very long distances

• )Interconnecting two systems with the same nominal frequency

• Eliminating reactive power requirement in the operation

• Minimizing harmonics at the converter stations

Bulk power transmission over long HVDC lines are preferred, on account of

• Low cost of HVDC Transmission

• No Harmonics Problem

• Minimum line power losses

• Simple protection

HVDC transmission is preferred to EHVAC because

• HVDC terminal equipment are inexpensive

• System stability can be improved

• VAR compensation is not required in HVDC systems

• Harmonics problem is avoided

A dc line carries as compared to ac line

• more power

• less power

• same power

• can’t be decided

Back to back HVDC is used to

• increase the transmission capability

• decrease line losses

• provide a stable connection

• reduce the voltage drop

HVDC transmission lines are _________as compared to HVAC lines.

• difficult to erect

• more expensive for long distances

• more expensive for short distances

• less expensive for short distances

In HVDC transmission lines

• both the stations operate as an inverter

• both the stations operate as a converter

• one acts as a converter and other as an inverter

• depends upon the type of the load

In HVDC converters, the thyristor are connected in series

• To provide the required current rating, and they are turned on at the same instant.

• To provide the required current rating, and they are turned on at different instants

• To provide the required voltage rating, and they are turned on at the same instant.

• To provide the required voltage rating, and they are turned on at different instants.

Asynchronous tie line is a

• AC transmission line

• DC transmission line

• either 1 or 2

• none of the above

A 12-pulse converter consists of

• two 6-pulse converters in parallel

• two 6-pulse converters in series

• (a) or (b)

• (a) and (b)