Linux kernel newbies em português

Single- phase power Definitions :
Single-phase power , usually refers to 380V AC three-phase four -wire system in any one phase line ( commonly known as FireWire ) + zero line voltage is 220V, phase measurements with ordinary low-voltage electric pen will be light, neutral does not light , everyday the most common life energy .
s5451w , spm5001 pricing, inventory, availability; more than 500 thousand obsolete and hard to find electronic components offer on http://www.lincomponents.com, 7-10 day shipping to around the world, go our web finding what you need and quote now.
Single-phase three-phase power supply with distinction :
Three-phase power and single phase power difference: the power generated by the generator is of three phases , each phase and the neutral point of the three-phase power may constitute a single- phase circuit to provide electrical power to the user . Note that in this AC circuit can not be called positive or negative , should be called the line side ( China said electricity FireWire ) and neutral ( neutral people said electricity ) .
2 , in accordance with the provisions of the neutral point 380 volts ( three phase ) of the civil power should not be grounded in into the household (in the transformer is grounded, the ground is not taken into account due to the suspension point caused by a point higher than the supply voltage bit , grounding the client side of the ground and the transformer is in the earth there is a certain resistance ) , power supply is a FireWire and a zero line ( neutral point lead ) to form a loop in the single-phase three-pin power jack also connected with a ground wire. This is taken into account to achieve leakage protection function ( leakage protection works : If you have the power to touch the human side that FireWire cable , or electrical leakage inside the device , then the current through the body from the line of fire live electrical equipment enclosures inflows earth, without passing through the zero line , the current line and neutral will not equal leakage protection after detecting a difference in this part of the current trip and appliances immediately to protect the personal safety of the general flow of this poor choice in tens of milliamps ) If, on the neutral point directly grounded power supply ( which is not allowed in public electricity construction ) , leakage protection loses its effect, not short-circuit protection of the physical and electrical equipment .
Three-phase power can lighting, three lights connected into a star line connection, both either a line interconnecting each lamp , the other three lines each lamp connected with phase line , it constitutes a loop three-phase with any line voltage between the two is 380 volts, the voltage between each phase and earth is 220V.
There are three -phase electric line of fire, there are two two-phase three-wire line of fire, in my ancient memory seems to have only one FireWire ah ( Khan ) , to so many FireWire what ah " as long as the landlord to analyze and read the answer below will understand :
( 3 ) "three- power" concept is : a detailed point of it, we know that when the coil is rotated in a magnetic field , the magnetic field lines are cut wires induced electromotive force , it said sinusoidal variation available . If we take the three coils , they are almost 120 degrees relative position in space , the three coils in the magnetic field is still rotating at the same speed , the same will be induced electromotive force of the three frequencies . As the three coils differ in the spatial location point 120 degree angle, so the generated current is also a three-phase sinusoidal variation , called the three-phase sinusoidal alternating current. Three-phase electric power industry , such as three-phase AC motors.
Voltage between any two phases are 380VAC, either relative voltages are 220VAC. Divided into A, B phase , C phase . With L1, L2, L3 to represent the line. ( Three-phase alternating current because there are different uses and 6000VAC 660VAC power supply , etc. ) .
1.1 can produce equal amplitude , frequency equal to 120 ° phase difference potential generator called phase generator ; three-phase generator as a power source , called the three-phase power ; three-phase power supply circuit , called three-phase circuits. U, V, W is called a three-phase , phase to phase voltage between the line voltage , the voltage is 380V. Called the center line between the phase -phase voltage , the voltage is 220V.
2.1 Three-phase electrical load connection
Into Delta Connection and Y -shaped connection.
Delta Connection load leads to three FireWire and a ground voltage between the three FireWire is 380V, either on the ground firing line voltage 220V;
Y-connection load leads to three FireWire, a zero line and a ground voltage between the three FireWire is 380V, either FireWire or voltage on the neutral ground is 220V.
The total three-phase electrical power equal to each phase voltage multiplied by current per phase and then multiplied by three , that the total power = current × voltage (220V) × 3 (W = U × I × 3)
2.2 Three-phase electric meter three-phase power meter with a mechanical watch , ordinary electronic watches, electronic card table are three general specifications: 1.5 ( 6 ) , 5 ( 20 ) , 10 ( 40 ) 15 ( 60 ) , 20 ( 80 ) , 30 ( 100 ) ( voltage 3 × 380/220V ~).
Note: The meter load can be different than the variable inductor to achieve through the use of optional requirements . Such as: the distribution sense coil meter specifications for the use of 3x1 (2) A , the election inductance coil turns ratio of 1:50 , the maximum rated current per phase can carry as 100A.