Types of Substations in a Power Grid

Questions and Answers

What is the primary function of a collector substation in a wind farm or solar farm?

To provide power factor correction

To step up voltage for transmission (correct)

To step down voltage for distribution

To meter and control the wind farm

A switching station is a substation that operates at multiple voltage levels.

False

What is the objective of distribution system planning?

To assure that the growing demand for electricity can be satisfied in an optimum way by additional distribution system from the secondary conductors through the bulk power substation, which are both technically adequate and reasonably economical.

The collector substation can also provide _______________ correction if it is needed.

power factor Signup and view all the answers

What is a key factor affecting distribution system planning?

All of the above Signup and view all the answers

Match the following components of distribution system planning:

Load forecasting = Determining the load magnitude and geographic location Substation expansion = Increasing the capacity of an existing substation Primary voltage selection = Selection of conductor size Signup and view all the answers

A collector substation is similar to a distribution substation, but with power flow in the opposite direction.

False Signup and view all the answers

What is the goal of distribution system planners when placing and sizing distribution substations?

To serve the load at maximum cost effectiveness by minimizing the feeder losses and construction costs, while considering the constraint of service reliability. Signup and view all the answers

What is the primary function of a distribution substation?

To transform voltage and isolate faults in the transmission or distribution systems Signup and view all the answers

A distribution substation is typically the point of voltage regulation.

True Signup and view all the answers

What is the purpose of surge voltage protection in a distribution substation?

To protect the substation from voltage surges. Signup and view all the answers

A distribution substation is connected to a sub-transmission system via at least one _______________________ line.

supply Signup and view all the answers

Match the following components of a distribution substation with their functions:

Transformers = Reduce sub-transmission voltage to primary distribution voltage Bus-bars = Connect the supply line to the transformers Switchgear = Control and protect the substation Surge voltage protection = Protect the substation from voltage surges Signup and view all the answers

What is the purpose of grounding in a distribution substation?

To protect the substation from lightning strikes Signup and view all the answers

What is the purpose of a transmission substation?

To connect two or more transmission lines Signup and view all the answers

A feeder is a type of _______________________ conductor that runs along streets overhead or underground.

circuit Signup and view all the answers

A distribution substation is typically supplied by only one supply line.

False Signup and view all the answers

A distribution substation typically operates at high voltage levels, above 765 kV.

False Signup and view all the answers

What is the function of a phase shifting transformer in a transmission substation?

To control power flow between two adjacent power systems Signup and view all the answers

A collector substation is also known as a _____________ substation.

transmission Signup and view all the answers

Match the following types of substations with their descriptions:

Transmission = Connects two or more transmission lines Distribution = Transfers power from the transmission system to the distribution system Signup and view all the answers

What is the primary purpose of a surge voltage protection device such as a lightning arrester?

To protect equipment from surge voltages Signup and view all the answers

A switching station is a type of substation.

True Signup and view all the answers

What is the typical input voltage for a distribution substation?

At least two transmission or sub-transmission lines, with input voltage typically around 115 kV or whatever is common in the area Signup and view all the answers

Study Notes