What is pole in HVDC?

What is pole in HVDC?

The HVDC system pole is the part of an HVDC system consisting of all the equipment in the HVDC substation. It also interconnects the transmission lines which during normal operating condition exhibit a common direct polarity with respect to earth.

What is the length of the HVDC Cook Strait undersea transmission line?

HVDC Inter-Island
Technical information
Type Bipole HVDC powerline with overhead transmission line and submarine power cables underneath the Cook Strait
Type of current HVDC
Total length 610 km (380 mi)

How do DC transmission lines work?

In a line-commutated converter, the DC current (usually) cannot change direction; it flows through a large inductance and can be considered almost constant. On the AC side, the converter behaves approximately as a current source, injecting both grid-frequency and harmonic currents into the AC network.

What links the electricity supply between the North and South Island of New Zealand via the Cook Strait?

The high voltage direct-current (HVDC) link between Benmore and Haywards is a 600 megawatt (MW), 500 kilovolt (kV) HVDC transmission link that integrates power supply between New Zealand’s South and North Islands.

Which is the type of HVDC transmission?

The high voltage direct current transmission can be classified into three different types such as monopolar link, bipolar link and homopolar link.

Who owns Benmore Dam?

Meridian Energy
The $62 million construction of the dam and hydroelectric station began in 1958. It was commissioned in 1965, and officially opened by Prime Minister Sir Keith Holyoake on 15 May that year. It was built for the New Zealand Electricity Department; since 1999 it has been owned and operated by Meridian Energy.

Where is the Cook Strait cable?

The original Cook Strait cable is hauled ashore at Ōteranga Bay on Wellington’s south-west coast in 1964. Each metre weighed around 45 kilograms (about the same as a metre of railway line).

Why is HVDC transmission preferred over HVAC transmission?

In general applications, HVDC can carry more power per conductor than AC, because for a given power rating, the constant voltage in a DC line is lower than the peak voltage in an AC line. This voltage determines the insulation thickness and conductor spacing.

Where does the Cook Strait cable leave the South Island?

Travelling 610km from Lake Benmore on the Waitaki River to Oteranga Bay, near Wellington, the cables supply North Island homes with cheap power from the South Island’s hydroelectric power schemes.

Which type of HVDC system only one pole is used?

Answer: A bipolar HVDC system is described as a say ± 500 kV/ ± 400 kV/± 600 kV, etc. A bipolar system is advantageous over monopolar is that when any fault occurs in one pole, the system may be changed to monopolar mode with a ground return path.