Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Electrical part
Document related concepts
Electrification wikipedia , lookup
Transformer wikipedia , lookup
Electrical ballast wikipedia , lookup
Current source wikipedia , lookup
Electrical substation wikipedia , lookup
Variable-frequency drive wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Three-phase electric power wikipedia , lookup
Mathematics of radio engineering wikipedia , lookup
Ground loop (electricity) wikipedia , lookup
Power engineering wikipedia , lookup
Skin effect wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Buck converter wikipedia , lookup
Surge protector wikipedia , lookup
Opto-isolator wikipedia , lookup
Rectiverter wikipedia , lookup
History of electric power transmission wikipedia , lookup
Galvanometer wikipedia , lookup
Electric machine wikipedia , lookup
Magnetic core wikipedia , lookup
Voltage optimisation wikipedia , lookup
Stray voltage wikipedia , lookup
Resonant inductive coupling wikipedia , lookup
Transcript
Power Stations Electrical part of power stations Generator Spinning coils of wire within magnetic fields Property of electromagnetism that a changing magnetic field through a loop of wire produces a voltage along the loop This voltage can drive a current and provide energy to an external circuit The Generator Principle Loop of wire (conductor) rotates within stationary magnetic field this produces changing field requirement Brush contacts connect to rotating loops and carry current to external circuit In practice, wire makes many (thousands of) loops to get a larger voltage each loop adds to voltage Simplest arrangement leads to alternating current (AC) Synchronous speed The relation between speed and frequency is N=120f/P, where f is the frequency in Hz (cycles per second). P is the number of poles (2,4,6...) and N is the rotational speed in revolutions per minute (RPM). The Transformer Principle Current through loop produces magnetic field along axis of loop Alternating current produces changing magnetic field Magnetic field carried along iron core Secondary coil sees changing magnetic field and develops alternating voltage Ratio of voltages is just ratio of turns in the two coils: V2 = (N2/N1) V1 Allows transmission at high voltage, household at low voltage
