Transmission & Distribution

Electric power Transmission & Distribution is the bulk movement of electrical energy from a generating site, such as a power plant, to an electrical substation. The interconnected lines which facilitate this movement are known as a transmission network. This is distinct from the local wiring between high-voltage substations and customers, which is typically referred to as electric power distribution. The combined transmission and distribution network is known as the “Power Grid”.

Transmission lines move electricity over long distances at 132 or 230 or 400 kV, before arriving at a substation where the voltage is lowered.

A substation is a part of an electrical generation, transmission, and distribution system. Substations transform voltage from high to low, or the reverse, or perform any of several other important functions.

Once the voltage has been lowered to 66, 33 or 11 kV, the electricity is moved through to large industrial customers or the distribution network where it is taken to homes and businesses.

Electric power Transmission & Distribution is the bulk movement of electrical energy from a generating site, such as a power plant, to an electrical substation. The interconnected lines which facilitate this movement are known as a transmission network. This is distinct from the local wiring between high-voltage substations and customers, which is typically referred to as electric power distribution. The combined transmission and distribution network is known as the “Power Grid”.

Transmission lines move electricity over long distances at 132 or 230 or 400 kV, before arriving at a substation where the voltage is lowered.

A substation is a part of an electrical generation, transmission, and distribution system. Substations transform voltage from high to low, or the reverse, or perform any of several other important functions.

Once the voltage has been lowered to 66, 33 or 11 kV, the electricity is moved through to large industrial customers or the distribution network where it is taken to homes and businesses.

Transmission lines move electricity over long distances at 132 or 230 or 400 kV, before arriving at a substation where the voltage is lowered.

The purpose of a substation is to ‘step down’ high voltage electricity from the transmission system to lower voltage electricity so it can be easily supplied to homes and businesses through our distribution lines. Transformers are the largest single piece of equipment in a substation. A Substations also include small buildings for staff facilities and technology for protection and control systems. This allows the site to be remotely monitored and operated from our central control room.

Electric power distribution is the final stage in the delivery of electric power; it carries electricity from the transmission system to individual consumers. Distribution substations connect to the transmission system and lower the transmission voltage to medium voltage with the use of transformers. They work by increasing the voltage of the electricity produced by the generator, from an average of between 12,000 and 22,000 Volts, up to transmission voltages of 132,000 and 275,000 Volts, and then back down to 66,000, 33,000 or 11,000 Volts to enter the distribution network.

Substations without transformers are called switchyards. A switchyard is remotely operated to re-route power supplies where there is an immediate or critical need.

Light poles provide lighting for crews that might need to attend the site in the event of a fault.

Surge arrestors protect equipment within the substation from any voltage spikes on the transmission lines.

Line disconnectors allow transmission lines and equipment within the substation to be safely isolated for maintenance work.

Gantries guide transmission lines into the substation.

Voltage and current transformers measure voltage and current entering and moving through the substation.

Circuit breakers are automatic switches that interrupt electrical flow to de-energise equipment and clear faults.

Lightning masts attract lightning away from sensitive substation equipment.

Busbars are conductors which connect equipment within the substation.

Weather stations provide real time information about localised conditions which could affect the safe and reliable operation of the transmission network.

Power transformers increase or reduce voltage, depending on whether the substation is an entry point to the transmission network or an exit to the distribution network.

Communications towers allow substations to be remotely monitored and operated.

Our multi-layered security and safety measures around substations ensure public safety, protect the integrity of the equipment and assure the ability of the transmission network to ‘keep the lights on’. While it is quite safe to live near, pass by, or view a substation from outside the perimeter fence line, it is very dangerous for a person without appropriate training to enter a substation.

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