Nervnomirne navantage of the triphasic lancet. Symmetric regime of the three-phase lanceug
Active pressure- the sum of the active tensions of the phases of the tension of the active tension in the zero droit, i.e. yoga active opir not equal to zero: .
Reactive pressure is the sum of the reactive tensions of the phases reactive pressure in a zero dro_ yakscho yogo reactive op_r is not equal to zero, tobto .
The core tension is attributed to the following formula: .
If the voltage is more symmetrical and equal, then the active and reactive tension of the zero wire is equal to zero, the active tension of the phases of the voltage is equal, and it is assigned to the auxiliary value of the phase stream and the phase voltage, then the reactive tension of the phases of the voltage is also equal, voltage:, de cut-cut between the phase voltages or the voltage on the phase of the advancement and the phase strum or the strum that flows through the phase of the advancement. Then the active tension of the tension can be assigned to the formula, and the reactive tension of the attachment can be assigned to the following formula:
In case of equal tension of the phases, regardless of the method of entry, the following equality is calculated: , then, also, the total tension of the tension can be determined by the formula:.
Simulation of the active tension of the triphasic lancet.
In a mood, if the ambition is uneven and є zero wire, it is necessary to include three wattmeters in the lancet, with which the straining of the lancet is active, more than the sum of the readings of three of these wattmeters.
With equal pressure, it is enough to reduce the tension of one phase and build the result.
As a zero wire, the daily tension can be overcome for the help of two wattmeters. The sum of the readings of two wattmeters indicates the active tension of the entire lance, regardless of the method of arrival of the tension.
The first meter shows the value, the other shows the value.
After summing up the readings of wattmeters, we take into account: .
36. Transformer – e/m device, appointments for the transformation of the additional magnetic field of the electric energy of the zminy stream of one voltage to the electric energy snake struma extra voltage to save frequency At the transformer, the transmission of e / e from the primary lancet at the second one is carried out for the help of a changeable magnetic field in the core.
Transformer - static electromagnetic attachment, which may be two or more inductively connected coils, assignments for converting the changeable stream of one voltage to the changeable stream of less voltage and frequency for the additional electromagnetic
37. Transformer - attachment, which transforms the changeable stream of one voltage into a changeable stream of another voltage and frequency.
Classification:
by confession:
power (at the borders, electricity was distributed);
vimiryuvalni (like elements of vimiryuvalnih outbuildings):
zvaryuvalni (in elektrozvaryuvanni);
pichnі (like elements of electrothermal outbuildings);
by design:
single-phase
triphasic
rich winding
for the cooling method:
repeat
oily
Vimіryuvalnі transformers are subdivided into struma transformersі voltage transformers.
mensha vitrata conductor material, lesser variability and greater efficiency of power transmission lines with the same tension and pressure of the power transmission line.
Possibility of taking two operating voltages (line and phase) in one three-phase choti-conductor system.
Possibility of a simple magnetic field (MFF), which turns out to be, on the basis of which the robot of the most wide-spreading electric energy is based - three-phase asynchronous and synchronous electric motors.
Pressure of the triphasic lanceug
Pressure of the triphasic lanceug – the sum of the total tensions of all three phases
yak i v single-phase lanceug active, reactive, and the same tension of the triphasic lancet induces spivvіdnennia: 
.
The tension, whether it be from the phases, is expressed by the stupendous formula:
In times of symmetrical tension, the tightness of all three phases obviously equal:
і for the tightness of a triphasic lancet, you can write: .
For a triphasic lancet with a symmetrical approach: ,
Therefore, for the tightness of a triphasic lancet, you can write:
Moreover, at more symmetrical vіdomi spіvvіdnoshennia mіzh liniymi and phase naprugami i struma: I L = I F, U L 
U Ф - when z'ednanny for the "zirka" scheme, I L I F, U L \u003d U F - when z'ednanny for the "trikutnik" scheme.
After the introduction of the virase strains, the formula for the tightness of the triphasic lancet in the overhead depression with symmetrical tension is taken: .
In times of asymmetrical tension, the tension of the triphasic lancet should be known as the sum of the total tensions of all three phases (that is, the sum of the total phase tensions):
Simulation of active tension in the triphasic lancet
The active tension of the lance of the snake struma P = I U cos φ is controlled by the help of an electrodynamic wattmeter, the vimiruval mechanism of which consists of two coils, one of which can wrap around.
Winding of a non-destructive cat - last or strum winding - may be small opir and turn on in the extinction of lancers successively , and the winding of a ruhomoy cat - voltage winding - may the great opera turn on in parallel on the zatiskі navantazhennya (quietly). de k - design factor, I - strum at the last winding of the wattmeter.
When the wattmeter is turned on in the lantern, the next step is to take care of the correct connection of the wattmeter windings, the cob of them (generator shutdown) are indicated by stars (*). Offended by the generator's zatikachі owing to but come to one and the same dart from the side of the dzherel of electric energy (generator).
To control the active tension of a triphasic lancet, a single-phase wattmeter of active tension is often used, which is switched on for different circuits.
Simulation of active tension by the method of one wattmeter
The method of one wattmeter can only be used in three-phase lances with symmetrical phases. With symmetrical tension, the skin tension is reduced from the three phases, however, to achieve the tension of one phase i, multiplying the result of the reduction by the number of phases, take away the tension of the three-phase lance: .
Also, for mitigating the tension with a symmetrical voltage, one wattmeter is enough, the strum winding of which is switched on in series with the phase voltages, and the voltage winding is switched on to the phase voltage.
If the neutral point of the voltage is not available, then the phase tension in the circuit should be controlled by the circuit with a piece of a neutral point created by the winding of the voltage of the wattmeter Z V and two equal supports of additional resistors Z 2
і
Z
3
: 
.
Symmetric mode triphasic lanceug
On fig. 7 shows a topographic diagram and a vector diagram of streams in the symmetrical mode for the circuit in fig. 4 and the inductive nature of the bias ( j > 0).
Strum at the neutral dart every day:
therefore, with a symmetrical approach, the neutral wire is not blocked. Line voltages are calculated as retail phase voltage:
From the equal-femoral tricot ANВ may: 
On fig. 8 pointed vector diagrams voltage and streak in symmetrical mode j > 0 for schema Linear streams are recognized as retail phase streams:
Active contraction of the symmetrical three-phase primach
Take it to respect
and when z'ednannі gіlok priymacha tricutnik
taken independently in view of the day
Follow the memory, what do you think j - zsuv phase between phase voltage and phase strum.
Similarly, for reactive and total tensions of a symmetrical three-phase priming machine, it is possible
Significantly sumarnu mitteva tightness three-phase priymach for symmetrical mode. Let's write down the values of the phase voltages and streams, having adopted the cob phase of the voltage u And equal to zero:
that virazi for mittevih the value of tightness of the skin phase of the priymach:
With subsumovuvanni mittiev, the value of the tightness of the four phases of the other additions in the sum will give zero. That is why the mitteva is tight
do not lie down in the hour and do not have active sweating.
Rich-phase lansiugs, in some places, the meaning of tightness is constantly called vrіvnovennosti.
Respectfully, what is biphasic symmetrical lanceug(Fig. 9) h asymmetric system EPC dzherela zhivlennya (div. fig. 3, b) the system of strums is also asymmetric, prote lance is vrіvnovazhim, oskolki sum mittєvih the value of tautness in the phases of fast. It can be shown by this very path, like a bula, the vrіvnovazhenіst symmetrical triphasic lancet is shown. 
The steadiness of mittevih creates the meaning of tension smart mind for robotic generators and motors from the point of view of their mechanical stress, that is why there are daily pulsations of the torque that are experienced by single-phase generators and motors.
Looking at the symmetrical modes of linking the three-phase lances, it is easy to show the superiority of the remaining ones in the economic relationship with the non-linking three-phase systems of the lances. An unconnected triphasic system of lancers has six darts from strums I l \u003d I f. Triphasic lanceug without neutral dart, how to live your own priymachi, with a star, only three darts with the same strums I l \u003d I f i line voltages, in the root of three times more line voltages at the unconnected three-phase system Lanzyugiv, for Yako U l \u003d U f. At the same time, the number of streaks in the tricots also appears twice less than the darts, the lower ones in the unconnected three-phase systems of the lances (three instead of six), with which the struma in the linear darts is not 2 times more than the phase streaks, but only in the root of the trio. Tse allows you to change the material on the darts.
