Generation/Transmssion Distribution Revision

How is the maximum number of PV panels on a string determined?

• By the maximum input voltage of the inverter

• By the number of solar cells in each panel

• By the amount of sunlight available

• By the voltage of the solar panels

What is the typical voltage output from a SOLAR FARM inverter?

• 120v single phase

• 230v single phase

• 400v three phase

• 1000v three phase

One method of generating uses the natural power of water flowing from lakes or mountains down to the sea to drive generators. 

Which is the type of generator typically used in New Zealand for this?

• Induction generator

• Synchronous generator

• Pemanent magnet generator

• DC generator

Generated values of voltage are typically 11kV but could be as high as what value in New Zealand?

• 33kv

• 110kv

• 220kv

• 350kv

Which range of transmission voltage levels is typically used in New Zealand?

• 110 - 220kv

• 220 - 765kv

• 765 - 1100kv

• 1100 - 1500kv

What is the main disadvantage of the very high transmission voltage levels?

• Decreased power transfer capacity

• The cost of transformers, switchgear, and other equipment increases as the voltage increases

• Decreased efficiency

• Increased voltage drop

What is the main advantages of the 3 phase 4 wire system as used in New Zealand?

• The system is safer than a 3-wire system

• The system is more powerful than a 3-wire system

• The system is less expensive than a 3-wire system

• We are able to obtain both a 3 phase and a 1 phase supply

What is the typical high voltage distribution voltage level used in New Zealand?

• 110KV – 220KV

• 230V – 400V

• 6.6 - 11 kV

• 50V – 1000V

Using much higher transmission voltage levels gives improvements in several areas. 

Which two (2) of these improvements are correct?

• Reduced losses

• Reduced cost of equipment

• Increased systems stability

• Lower volt drop

For the national supply grid generation, transmission and high voltage distribution, which of these describes why multiphase power is used in New Zealand?

• There are fewer conductors required for transmission.

• Three phase and single phase supplies are available.

• It is more efficient to generate multiphase power.

• Multiphase alternators can be run in series.