single-phase power outlet wiring requirements
a variety of single-phase socket, often two holes and three holes.
two holes side by side left and right, three holes form a triangle.
wiring hole next to the standard alphabet, L is the fire N is zero.
three holes are even E, said the ground in the middle.
socket set to face the direction of the hole wiring requirements.
left zero line right-energize, take the middle ground protection.
electrical formulas (47)
leakage protection options
choose leakage protection, power supply first.
single-phase power two hundred and twenty, two, or second-line single-stage.
three-phase three-wire three hundred and eighty, the choice of three protectors.
three-phase four-wire three hundred and eighty, four-wire three or four.
electrical formulas (XLVIII)
light bulb does not find the way of reason
lamp does not light Jiaoren trouble, common causes of broken filament.
see a clear light bulb, electric pen can otherwise experience.
close the switch point at both ends, no shine off the line of fire.
turn on and off the filament off, break off both ends of the zero line.
electrical formulas (forty-nine)
buried underground wire break before check and breakpoint method for determining core
wires buried underground before, without breaking the core plates of inspection. Check with megger
, L-wire termination,
; lead the other side turn on the water, the E side do the same instrument to do,
; slowly shaking megger, the needle is less than zero break.
find breakpoints where instrumentation DG3,
; then a single-phase AC, instruments attached to embedding,
; from start to finish slow moving, light hair light meter is not broken,
if the lamp is off, Here is the break point.
electrical formulas (fifty)
low voltage testing single-phase AC electric pen to determine the method of circuit failure
exchange of experience in electric power
pen, light does not shine in the line of fire.
circuit failure to check, measure the power and ground fire.
light off the normal check equipment, disconnect the circuit is not suspicious.
If both ends are off, the power has been out of line of fire.
If both ends of the shiny, broken or out of the zero line.
electrical formulas (51)
DC voltage with a multimeter measuring method
zero before measurement, select the moderate range.
determine the positive and negative circuit,LV Sunglasses shop, wired in parallel to find out.
black pen then negative and the red is to be connected. If the hands
reverse turn, reverse polarity wiring positive and negative.
electrical formulas (52)
DC current with a multimeter measuring method
zero before measurement, select the moderate range.
determine the positive and negative circuit, series wiring to find out.
black pen then negative and the red is to be connected. If the hands
reverse turn, reverse polarity wiring positive and negative.
electrical formulas (fifty-three)
conductor with a multimeter measure the DC resistance method
Resistance measurement range selected, and then finished selecting zero range.
two pen short look at hands, not in the zero to be adjusted.
rotating ohm zero button, hands to be considered as zero.
knob in the end there are several, replace the battery and then adjust.
contacts must be good, big hands to block vacant.
accurate measurement values Paul, the best hands in the grid.
measurement is completed off the power knob to the voltage.
electrical formulas (fifty-four)
capacitor with a multimeter to determine good or bad
capacitor is good or bad crude judgments, multimeter can afford.
resistance by using K files, pick a table document the extreme.
hands placed close to zero, and then slowly to return.
arrive somewhere to stop, return to the more healthy.
to zero does not move a short, returns have less leakage.
start measuring table does not go off line within the capacitor.
electrical formulas (fifty-five)
with charge and discharge method to determine the capacitor is good or bad
capacitor is good or bad crude judgments, charge and discharge method can afford.
connected across the capacitor, DC, a little time to cut off.
conductor point by two very, pay attention to see whether the spark,
; a fire without the fire for good or bad, well done with the kind of fuller.
electrical formulas (eighty-six)
known three-phase asynchronous motor rated capacity and voltage, rated current of the approximate strike
small and medium-capacity high-voltage, current estimates see kilowatts.
gives the relationship in value, reducing the capacity of the small plus large capacity.
one kilowatt two amps, used low-voltage three hundred and eighty.
kV high-voltage motors three, four kilowatts a safe flow.
kV voltage higher six, eight kilowatts a safe flow.
rated to 10,000, thirteen kilowatts for a safety.
electrical formulas (eighty-seven)
three-phase 380V motor to switch single-phase 220V power supply wiring methods and access to the capacitor capacitance calculation
single-phase motor phase change
,supra shoes tk, winding connection according to the status quo.
three-terminal outlet has used, both connected to the supply capacity of a connection.
content after access to power, then turned to the anti-zero-energize.
single-phase motor phase change, and then capacitor. see connection
work capacity, then a small satellite to take a large angle.
100 W motor microfarads number, angle of ten stars then pick six.
start capacitor with a large, ten-watt two to three micro-method.
capacitor voltage power supply to see, two hundred and twenty power three hundred and thirty.
electrical formulas (eighty-eight)
inductive load circuit current and voltage phase relationship
inductance in a wonderful
met just a very strange, hard to tell whether the heart Retroflex Suffixation.
when they need breaking up,
supply a voltage increase, the current moment is difficult accessibility.
off the supply voltage off, difficult to cut off the current moment.
analogy to teach the popular, the voltage after the first stream.
difference of electrical angles, the maximum value of ninety degrees.
electrical formulas (eighty-nine)
estimate the weight of lead per kilometer
one thousand meters have multiple wires, depending on cross section and variety,
mm square cross-section units, multiplied by the coefficient values are different.
lightest hard aluminum 2.8 aluminum, followed by the three-by.
steel core aluminum twisted multiplied by four, seven eight iron is relatively heavy.
pure copper and then re-8.8 9.0 heaviest steel cutter.
consider sag and binding, and then 1.0 Triyana.
related to the formula: mass = density X volume
volume = base area X height
electrical formulas (ninety)
generator principle and right-hand rule
wire cutting the magnetic field lines, electromagnetic induction raw inside.
wire external closed road, during which there is current flow.
determine the flow with the right hand, stretched out his right hand into the plane.
thumb movement lead to, palms facing N extreme.
the direction of the current four fingers, the end is now extreme.
electrical formulas (ninety-one)
Kirchhoff's first law, second law
Kirchhoff is a celebrity, he invented the law of the circuit.
current of the first node, out, into the two-phase level.
circuit voltage of the second, drop, two equal potential.
electrical formulas (ninety-two)
Rectifier output DC voltage and input AC voltage relationships and the rectifier diode reverse voltage
AC voltage to DC output voltage is what needs?
input voltage as 100 single-phase half-wave of forty-five.
three-phase half-wave one hundred and seventeen, the number of full-wave half-wave twice.
should the use of thyristors, from zero to the number.
tube back pressure to remember, the number of single-phase three-phase difference.
; single-phase bridge one hundred forty-one, three-phase bridge two hundred thirty-nine.
Note: The input voltage should be phase voltage.
electrical formulas (ninety-three)
resistors in series and parallel calculation of the total resistance
series resistance value increases, the more the longer the string the greater the resistance.
parallel resistance value is reduced, a considerable increase in cross-section. more difficult to find the total resistance in parallel
, the value of the first requirements of the countdown.
reciprocal of the reciprocal, that is, parallel resistance.
only two resistors in parallel, the total resistance can be simplified eq.
resistance of the product for two elements, and the denominator of the two resistance.
electrical formulas (ninety-four)
two three-phase AC power supply connection and two outlet ways
three-phase method, there are two, a triangle a star.
phase angle then a circle, the three vertices of three-phase line.
Star Alliance received three point linking point is called the neutral point.
three leads to the three-phase line, the midpoint of qualifying neutral.
phase called called FireWire, commonly known as the center line is called the zero line.
star connection can be two kinds of wire, three-phase three-wire and four-wire.
zero-phase three-wire line, zero-phase four-wire line.
electrical formulas (ninety-five)
rectifier diode to determine the positive and negative ways
diode has two poles, an anode a cathode.
distinguish polarity is relatively simple, first to see the chart record.
triangular end is extremely negative, short bars at one end to the anode.
not see the chart shape, more rounded at one end to the anode.
larger size with screws, screw one end to the anode.
worry if the amount of tables, multimeter ready together.
multiplied by one hundred resistance profile, two electrodes were connected pen.
than twice the positive and negative resistance, and a small note carefully.
resistance hour watch pen, black and red yin-yang fixed electrode.
electrical formulas (ninety-six)
bridge rectifier circuit connection method and the RC protection rectifier diode problem
four tube single-phase bridge, between two series and then parallel.
parallel ends of the DC,radii shoes for kids, two connection points into the power supply.
six tube three-phase bridge, between two series and then parallel.
parallel ends of the DC, two connection points into the power supply.
RC protection diodes, three kinds of connection you choose either.
one kind and in the AC side, one in the DC side.
there is a more complex, and both ends of each tube.
EMF inductive load, continuous parallel diode.
electrical formulas (ninety-seven)
the nature of magnets and magnet, the magnetic field and magnetic field lines
regardless of the size and thickness, magnet has two poles. Arctic, Antarctic
S N, the maximum magnetic field strength at both ends.
with very different poles repel smoke, everything is the same reason.
describe magnetic field lines, each line are closed.
in vitro from N to S pole, S to N through the body.
wire line do not cross each other, the relative intensity at both ends.
electrical formulas (ninety-eight)
to reduce output current ripple filter circuit is set up
To get stable flow, then the output filter circuit.
a resistance of a capacitor, connected as a T-shaped road.
two capacitors a reactance, the name is called to send the circuit.
there is a simple, two capacitors a resistor.
electrical formulas (ninety-nine)
deviate from the neutral line of brush and adjust the way
excitation connected again breaking at the same time we should see the instrument.
meter pointer back and forth swing, swing a larger brush side.
gently rotating brush holder, swing the smallest adjustment complete.
Electrical power reversing, two speed to subtract.
difference if a larger income, indicating that more biased brush.
gently rotating brush holder, adjust the smallest difference between the end
