Substation Construction—Function and Types of Stations 3-4-7

The high-voltage side of a step-down transformer in a substation is normally connected to the high-voltage bus in the substation.

False

An abnormally high or low voltage could cause a circuit breaker to trip out and remove a line from service.

True

Converter stations are needed at each end of DC transmission lines to turn the DC back to AC.

True

If one transmission line fails, a substation should automatically switch over to another line in order to avoid power loss for the substation's customers.

True

The third level of substation class is the distribution/municipal/industrial type found near end users.

True

The three main parts of an electrical power system are transmission, distribution, and generation.

True

A ? is an element in a substation used to make corrections to line voltage.

capacitor

A converter substation can be used to ? .

change AC voltage to DC voltage

The ? in a substation automatically remove or open a faulted circuit so that the faulted circuit does not cause further disruption to the system.

circuit breakers

An unqualified worker may enter an energized substation if ? .

escorted by a qualified person

All transmission lines come together and are connected at the ? of a substation.

high-voltage bus

The ? in a substation will direct a high-voltage surge to ground.

lightning arrestor

The source side of individual distribution feeder circuit breakers are connected to the ? in a substation.

low-voltage bus

To make corrections to line voltage, a substation may use load tap-changer transformers, voltage regulators, capacitors, and ? .

reactors

The main purpose of a substation between the transmission system and the distribution system is to ? the voltage.

step-down

The main purpose of a substation at the generating station is to ? the voltage level for the economical transmission of power.

step-up

A ? is normally built at the meeting points of each of the three main parts of a power system.

substation

To be qualified to enter a substation, an employee should, at a minimum, be trained and certified in ? .

the minimum approach distances for the different voltages in the substation

A ? substation is used for ultra-high voltages.

transmission

One of the main purposes of equipment such as circuit breakers, relays, and associated wiring is to ? .

trip out faulted circuits