Chapter 10 elec

In a three phase AC generator each of the three generated voltages is how many degrees apart from each other

120 degrees

In a two field pole single phase AC generator how many mechanical degrees of rotation does the armature have to rotate to produce one complete AC sine wave.

360 degrees

AC generators

Also referred to as alternators, convert mechanical energy into AC voltage and current.

surge suppressor

An electrical device that provides protection from transient voltages by limiting the level of voltage allowed downstream from the surge suppressor

What is the rotating coil of a generator called?

Armature

Delta Connection

Connection that has each coil end connected end to end to form a closed loop

Wye (Y) connection

Connection that has one end of each coil connected together and the other end of each coil left open for external connection.

temporary power interruption

Decrease to 0 V on one or more powerlines lasting for more than three seconds up to one minute

Momentary power interruption

Decreased to 0 V on one or more powerlines blessing from 0.5 cycles up to three seconds

And what type of connection are there to phase 2 neutral legs with the same voltage in a third phase to neutral leg that should not be used

Delta

And what type of generator are the 3 windings connected end to end to form a closed loop

Delta

For long term power interruption protection, a generator/UPS is used.

For short term power interruption, a static UPS is used.

Are slip rings used to convert generated AC voltage to DC voltage?

No

Open circuit transition switching

Process in which power is momentarily disconnected when switching a circuit from one voltage supply to another

three phase generator

Provides a more consistent voltage than single phase generator

Line-to-line Voltage/ Line voltage

The voltage measured between the lines

And what type of connection is the voltage between anyone of the three phases and the neutral the same

Wye

And what type of generator are the end of each of the three coil windings connected together

Wye connection

What is another name for an AC generator?

alternator

Slip rings

are metallic rings connected to the ends of an armature and are used to connect the induced voltage to the brushes

What produces the stationary magnetic field of a generator?

field windings

Each complete rotation of the armature in a single phase one wire AC generator produces one complete alternating current cycle.

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However, most generators use electromagnets, which must be supplied with current.

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None of the three wires are normally connected to ground

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The output of a 3 phase AC generator results in three output voltages 120 degrees out of phase with each other.

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The three ends can be safely connected at the neutral point because no voltage difference exists between them.

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Voltage between any two lines in a wye-connected AC generator is 1.73 multiplied by any of the individual phase voltages. If the 1 phase voltage is 100v, then the voltage between any two lines in the wye configuration will be 173 V (100x1.73)

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Brush

Sliding contact that rises against the commutator segments or slip rings and is used to connect the armature to the external circuit