Rozrahunok strumov short zamikannya

⁰

What is called a short chime (short circuit)? In short, the zamikannya - ts'ednannya strumoprovidnyh parts of the various phases or potentials between themselves or the body of possession, from the ground, in the meshes of electrical supply or in electrical receivers.

Why do you need a short chime (KZ)?

poor support of insulation in a watery chemically active medium;
with unacceptable overheating of insulation;
mechanical activities;
give pardon to the staff during maintenance and repairs.

With a short fading way, the struma is short.

As you can see from the very name of the process, in case of a short circuit, the lines of the stream are short, so in the case, bypassing the pressure of the pressure, then the fault can increase to unacceptable values, so the voltage is not connected to the electric shock.

But the voltage may not be turned on and for the obviousness of the zakhist, as the short circuit has become at the distant point, and because of the great support to the month of the short circuit, the insufficient spratsovuvannya of the zakhist. Ale this strum can be sufficient for spearing darts, which can be brought to life.

In order to be sure about the safety of your electrical wiring, you should consult with the chief electrician at the Queen or the electrician at Mitishchi. Meister carried out repairs and electrical installation works to increase the capacity short hum.

Strumi of a short chime: a necessary accurate rozrahunok.

Zvіdsi vinikaє rozrahunka strumu short zamikannya - struma KZ. The magnitude of the short-circuit current may change, so that other electrical receivers in more distant places will come to the electrical circuit of your house. At the same time, it is necessary to carry out a new short-circuit windup at the site of the installation of new electrical appliances.

Strums of short circuits also have an electrodynamic injection on the equipment and conductors, if their details can be deformed under the action of mechanical forces, which is blamed for great strums.

Dopomoga in rozrahunku strumіv short zmozhe can give our engineer electrician in Pushkino. If you have an apartment, house, or office in Ivantivtsi, then you need to call an electrician in Ivantivtsi to carry out electrical wiring diagnostics to prevent a short circuit.

With a short flicker, overheating of the devices and wires occurs.

Thermichna diya strumіv KZ polagaє at overheating devices and wires. Therefore, when choosing devices, it is necessary to reconsider the short circuit after the minds, so that the stench vitrimals of the short circuit at the station of the installation.

As you can see, the order of merezha with a dead-earthed neutral is to base the merezhi with insulated neutral. Let's take a look at the characteristic features of these measures for short circuit.

Single phase short circuit.

In practice, single-phase short circuits are used. At the lines from the insulated neutral, when one phase is connected to the ground, the mode does not short-circuit and the continuity of the power supply is not damaged, but there may be switching-offs, oscilki in the emergency camp. When one phase to the ground in this measure, the voltages on the other two phases move 1.73 times, and the voltage on the zero point becomes equal phase voltage good earth.

At the fences from the dead-earthed neutral, when the dart is fired from the ground, the guardian is burned, or spratsovu automatic wimicach When the electrical supply is damaged, and when the burner burns out, the windings of the motors can be damaged during operation on two phases.

As if in any part of the electrical wiring or electrical equipment (light bulbs, praski, then) the insulation will break down and the phase wire will hit zero, it will become a short flicker.

Shards between wires that are closed, there is no vanity, otherwise it seems, electric opir The contact time is practically equal to zero, the strum through the contact is more likely to grow, the docks to melt the darts, so, the cream, you can bring to the fire. For zakhistu in the form of a short zamikannya, the zabіzhniki serve. A simple (at the look of a “cork”) zapobіzhnik - a fusible insert is included in the phase wires, so that when the struma grows, it will burn and the lances will grow back before serious inaccuracies will occur. Structurally zapobіzhnik vykonany so scho tsya microcatastrophe not lead to suvannya zapobіzhnoy block. The little heroine, who sacrificed herself, is thrown away and replaced by an offensive one.

Zakhist vіd strumіv short zamikannya.

Yak mi z'yasuvali, strumi KZ are more unsafe, we look ahead fire safety. Therefore, it is necessary to induce the sound of short strums, so that you can install automatic switches in the shield. Automatic zabіzhniki vlashtovani so that at the time of a short buzzing, the growth of the struma of the short circuit is brought up to spratsovuvannya electromagnetic blower mitteva dії, yaka roz'єdnuє elektrichny lansyug without shkodi for yourself. In order to turn on the electrics again after a short flicker, you just need to press a button on the white (to serve as a red light) or throw the important thing down when you put it down.

The main reason for the disruption of the normal mode of the robotic system and the electrical supply is the fault of short flickers (short circuits) in the merezhі or elements of the electrical control due to poor insulation or incorrect diy service personnel. In order to reduce the speed, which is equipped with an output from the fret of the electric control when the short-circuit current flows through, as well as for the smooth renewal of the normal operating mode of the CEC, it is necessary to correctly assign the short-circuit currents and then select the electrical control, shut down the equipment and the short-circuit current.

Short flickers It is called without intermediary connection between some points of different phases, phases and zero drotu or phases from the earth, not transferred by the normal minds of the installation robots.

The main types of short flickers in electrical systems:

3. Single phase short circuit at any time, one of the phases flickering to zero wire or ground. Smarter recognition single-phase short circuit points

Strumi, tension, tension, other values that can be seen before a single-phase short circuit, are indicated

,

,

and etc.

Zustrichayutsya and other types of short circuits, tied with shavings of darts and one-hour zamikanniya darts of different phases.

Three-phase short circuit is symmetrical, shards with a new all three phases appear in the same minds. All else see the short flashes as unsymmetrical, because for them the phases are not lost in the same minds, after which the systems of streams and voltages appear to be created.

In times of short circuit, the electric support of the lancet of the system of the electric supply changes, due to which the streams at the heads of the system are sharply increased, and the voltages of the other lines of the system are reduced.

Elements of electrical systems may be active and reactive (inductive or omnisni) support, to that, in case of a rapt disruption of the normal operation mode (with faulty short circuit), the electrical system is equipped with a chimney circuit. The strumi at the system’s wires and the voltages in the other її parts will be changed by a stretch for the next hour after the short circuit fault is evidently up to the parameters of the circuit. Tobto. for an hour of a short zamikannya lancer poshkodzhenoї dіlyanki prot_kaє transitional process.

In case of short circuit in the skin of the phases, the order of the periodic warehouse struma (warehouse struma of the change sign) may be aperiodic of the warehouse struma (warehouse of the permanent sign), as it can also change the sign, but after great intervals the hour is equal to the periodic one.

Mitteve meaning new strumu Short circuit for a sufficient moment to an hour:

de - aperiodic storage stream short circuit at the time of the hour

;- cutoff frequency snake struma;- phase cut of the voltage of the dzherel at the moment of the hour

;- cut zsuvu strumu into lanceuge KZ shodo naprugi dzherel; - post_yna hour lanceug KZ;

- inductance, inductive and active opir of the short circuit.

Warehouse periodical struma SC (Fig. 1) is the same for all three phases and is assigned for any moment to the hour of the value of the ordinate of the curve, divided by

. Aperiodic warehouse strumu short circuit the difference of all three phases (div. Fig. 2) and changes fallowly depending on the moment of short circuit breaking.

Rice. 3. Changes in the hours of the periodic warehouse time of short circuit:

a) living hours from generators without ATS; b) the hour of life from the generators from the ATS; c) the hour of life in the energy system.

The amplitude of the periodic warehouse changes in the transitional process, up to the change in the EPC of the dzherel KZ (Fig. 3).

before inserted

, after which the amplitude of the periodic warehouse changes in

(Superperehidny strum short circuit) up to

(The short circuit has been restored) (Fig. 3, a).

For the presence of ARV generators, the storage stream of the short circuit is changed periodically, as shown in fig. 3b. The decrease in the periodic storage period in the cob period of the short circuit is explained by the inertia of the construction of the ARV, which starts to work after 0.08-0.3 from the date of the closing of the short circuit. With the rise of the generator start-up strum, the EPC increases and the short-circuit warehouse strum is periodically periodic to the set value.

If the tightness of the neck is more than the tightness of the element, when the short circuit is considered, which shows the neck of uncoated tightness, in which the internal opir is equal to zero, then the EPC of the neck is constant. Therefore, the periodic storage stream of the short circuit is inevitable by the protyazh of the transitional process (Fig. 3, c), tobto.

Aperiodic warehouse strumu KZ the difference in all phases and can change in the fallow time depending on the moment of the short circuit and the forward mode (at the boundary of the period). Shvidkіst zgasannya aperiodic warehousing struma lie down in the spіvvіdnoshennia between the active and inductive support of the lancet short circuit, tobto. kind of post : the more active opir of the lansyug, the more intensively extinguished. The aperiodic warehouse strumu of the short circuit manifests itself less in the first 0.1-0.2 from the moment the short circuit is vindicated. chime in vynachaetsya for the largest possible mittevim meanings, yak

(

)і vіdsutnostі strumu navantazhennya. With whom

.At the same time, the short circuit strum may have the most significant value. Appointment of minds є rozrakhankovy shdo strumіv KZ.

Maximum mittievy strum KZ may be approximately in the first period, then. after 0.01 after the faulting of the short circuit. The largest possible mittievy strum KZ is called a shock strum (Fig. 3). Yogo for the moment

h:

de

- shock coefficient, which should be deposited in the late hour of the lancer KZ.

Chinne value of the total short circuit for a sufficient moment to an hour is assigned to a virazu:

(3.4)

de - chinne meaning periodic warehouse stream KZ; - chinne value of aperiodic warehouse, which is more expensive

(3.5)

The highest value of shock strum for the first period in the cob of the short circuit process:

(3.6)

Intensity of short circuit for a sufficient moment to an hour:

(3.7)

Dzherela life KZ. When rozrahunku strumov short circuit take, scho zherel zhivlennya mіstsya short circuit є turbo-i hydrogenerators, synchronous compensators and dvigun, asynchronous dvigun. The influx of asynchronous motors is less likely to be damaged at the beginning of the hour, at times in quiet situations, if the stench is switched on without interruption to the short circuit.

The values are assigned. When rozrahunku strumіv KZ signify the following values:

-Pochatkove value of the periodic warehouse struma of the short circuit (common value of the supratransitional struma of the short circuit);

- shock strum short circuit, necessary for the re-verification of electrical devices, tires and insulators for electrodynamic stability;

- the most effective value of the shock struma of short circuit, it is necessary to recheck electrical devices for durability during the first period of the short circuit process;

- value for

, necessary for re-verification of vimics according to the stream, which are included in them;

- due to the value of short-circuit current, according to which electrical equipment, busbars, insulators and cables are re-evaluated for thermal resistance;

- Short circuit pressure for an hour

;signed for re-verification of vimics beyond the maximum allowable tension, which is included. For swedish vimics, the whole hour can be changed to 0.08 s.

Allowed that rozrahunkovі mind. To ease the calculation of strums of short circuits, take a low allowance:

1) EPCs of all dzherel are considered such that they run in phase;

2) ЕРС dzherel, signifi- cantly in the distance from the place of the short circuit (

), vvazhayut imminent;

3) do not guard the transverse lines of the short-circuit lanyards cable lines 110 kV vische) and jet magnetization transformers;

4) active opir of the lancer KZ is less liable for insurance

, de і - equivalent active and reactive supports of a short-circuited lance;

5) in a number of modes, do not reverse the injection of the navantazhen (or approximately reverse), the zocrema of the injection of other asynchronous and synchronous motors.

Vіdpovіdno up to the method of designation of the strums of the short circuit, the rozrahunkovі minds are installed, yakі include the folding of the rozrahunkovoї scheme, assigned to the short circuit mode, the type of short circuit, the point of expansion of the point of the short circuit and the rozrahunk hour of the short circuit.

When the mode of short circuit is assigned, it is possible to determine the maximum and minimum equal strums of the short circuit. So, for example, the re-verification of the electrical equipment for electrodynamic and thermal short-circuit strums is replaced by the most important mode-maximum, if through the element that is re-verified, the largest short-circuit strum flows through. Navpaki, for the minimum regime, what does it mean to the smallest strum of short circuit , zdіysnyuyut rozrahunok that reverification pratsesdatnostі pristroїv relay zakhistu and automation.

Select the type of short circuit signified by the method of rozrahunka strumiv KZ. For the purpose of designing the electrodynamic stability of devices and hard tires, it is necessary to take a three-phase short circuit; for the designation of thermal stability of devices, conductors - three-phase or two-phase short-circuit fallow in the stream. Re-checking including and including the features of the devices is carried out according to a three-phase or single-phase strumu Short circuit to the ground (near the fences with great strumas, the sound to the ground) in the fallows of the same value.

The choice of the type of short circuit in the case of a relay switch is assigned to a functional function and can be three-, two-, single-phase and two-phase short circuit to the ground.

Place rotashuvannya point KZ to choose in such a rank, that in case of a short circuit, the electrical control, which is believed, the conductors were known in the most unfriendly minds. For example, for the selection of switching equipment, it is necessary to select a short circuit without intermediary on їх output zaskach, vibrating a short circuit strum on the cob of the line. Mіstsya roztashuvannya short circuit point when rozrahunki relay zakhistu for її recognition - on the cob or kintsі dіlyanki, scho protected.

Rosrakhunkovy hour KZ. Spravzhnіy hour, by the stretch of which the short circuit is expected, the trivality of the deception and equipment, which are switched on,

. (3.8)

At the rozrahunka vikoristovuyut guidance (fictitious) hour - an hour, stretching out some short circuit strum, standing up, seeing the same amount of heat, as if guilty of actually seeing the short circuit strum for the current hour of the short circuit.

Guidance hour, scho vіdpovidaє povomu strum KZ,

. (3.9)

de - guidance hour for a periodic storage stream of short circuit;

- hovering hour for aperiodic warehouse strumu short circuit.

For a day time

From pointing, the hour for the periodic warehouse stream of short circuit is assigned to the nomograms.

For a day time

h

, de - the value of the pointed hour for

from.

Appointment of the induced hour for aperiodic warehouse and vibrate at

behind the formula:

, (3.10)

de - extension of the cob supertransitional struma to the installed on the short circuit (

).

At

- for the formula:

. (3.11)

Over 1 day per day sik. or

let us induce an hour of an aperiodic warehouse strum KZ ( ) you can snehtuvati.

Storinka 39 from 77

Knowing the value of the symmetrical streams of a 3-phase short circuit (Isc) at different points of the installation is necessary for the design of the installation.
Knowing the magnitude of the symmetrical streams of a 3-phase short circuit (Isc) at the strategic points of the installation is necessary in order to develop the parameters rozpodіlnogo pristroy(nominal strum short circuit); cables (nominal stream of thermal resistance); zahisnih outbuildings(Settings selective zakhistu) and so on.
At the advancing butts, a 3-phase short-circuit current of a zero support (so-called short-circuit current of a bolted installation) will be seen, which is fed through a standard transformer.
Behind the vinnyatka, even the most inconspicuous furnishings, which type of poshkodzhennya is the most serious and even easier to calculate.
Strumi KZ, in the lansyug, which live in the form of a generator of a zminny strum, as well as in the lancers fast strumu, At the head of M.
The simplest calculation and practical rules, as follows, give results of sufficient accuracy, which are most suitable for the purpose of the installation.
4.1 Strum short on zatiskach secondary winding step down transformer
For one transformer
As the first proximity of the high-voltage lancet opir is accepted
poignantly small, to that:
P = nominal pressure ^A of the transformer
U2n = open circuit voltage of the secondary winding
In = nominal jet in amps
Isc = strum short circuit in amps
= transformer short circuit voltage %. Typical values for different sub-transformers are shown in Fig. G32.

Rice. G3: Typical values of Uso for different ratings of kV transformers with high voltage winding U 20 kV
■ Stock
Vipadok dekіlkoh transformerіv, scho in parallel to live the bus
The magnitude of the short circuit strum on the cob of the line that goes into the selected tires (Fig. G34) can be estimated as the sum of the Isc strum, calculated for a skin transformer. It should be noted that the transformers are to be installed in the same high-voltage lines, at different values, omitted from Fig. G34, when added, give a little more value to the strum of the short circuit, lower those that will be true.
Other factors, if they were not accepted to respect, tse opir selected tires and automatic vibrations.
Transformer 400 kVA, 420 V, for wattage: Usc = 4%

Rice. G3: Width of decal transformers, if they work in parallel
However, otrimane value strumu short circuit є dosit accurate for the purposes of the electrical installation. A selection of automatic switches and built-in attachments that protect against a short circuit stream, descriptions in section N, p_drozdil 4.4.
4.2 3-phase short circuit (Isc) strum at any installation point low voltage
In a 3-phase strum installation, Isc, whether there is a point, is: de
U20 = no-load interphase voltage of the secondary windings of the live transformer(s).
ZT = the latest reference per phase in the lancet, ruffled glass, from the point of error (Ohm) Calculation method ZT
The skin component of the installation (high-voltage wire, transformer, cable, automatic switch, selectable bus, etc.) is characterized by its own support Z, which is formed active support(R) and inductive jet prop(X). You can remember that the mnistories of the support are not important for the hour of the winding up of the strum of the short circuit. Parameters R,Xі Z are in Ohms and are represented by the sides of a rectangular tricot, as shown in the scheme of the total support in Fig. G35. The method determines the value of R and X for skin lesions.

If the plots are connected to the lances sequentially, all the elements of the support in the plots are added arithmetically, like reactive supports, and give the value of RT and ХТ. The new opir (Z) for the joint business will then be repaid according to the following formula:

Whether it’s two dilyanki merezhі, connected in parallel, it’s possible, if the stench is insulting, more importantly resistive (or inductive), combine and take one equivalent opir (or reactive opir), as shown below: Let R1 and R2 - tse two support, z'ednani in parallel, the same equivalent opir R3 is known by the formula:
abo for jet prop
It is necessary to note that the calculation of X3 can only be carried out up to the rimmed lancet, without the addition of mutual inductance. As parallel to the lancets, they are close to one to one, the meaning of Xs will be more memorable.
Appointment of the total support of the skin component of the high-voltage barrier

■ Merezha, until the step-down transformer input is connected (div. small G36)

psc

Rice. G3t: The latest version of the high-voltage line for the low-voltage outputs of the step-down transformer

A formula that allows you to calculate the value and at the same time bring the latest support to its equivalent on the low voltage side.
de
Zs = the latest high-voltage measure, in milli-ohms
Uo = open circuit voltage of the low-voltage switch, expressed in volts
Psc = 3-phase fault intensity, expressed in kVA

Rice. 631: Scheme of re-support

Strum KZ in MVA: v3 ELIsc de:

El = interfacial Rated voltage railings, bending at kV (por.sq.)
Isc = strum of 3-phase short circuit, turns in kA (PSD).

Opir of the input high-voltage bar Ra, sound small in the case of a pair with a high-voltage support Xa, the value of which in Ohms is taken for the value of Za. If you need more accurate calculations, you can accept that Xa 0.995 Za and Ra cost 0.1 Xa. Rice. G36 values are given for Ra and Xa, which show the widest values of short-circuit intensities for high voltage11) in different live wires, and in itself, 250 MVA and 500 MVA.

■ Transformers (div. small G!)
The latest reference Ztr of the transformer from the low voltage side is given by the formula:
de:
U20 = open circuit voltage of the secondary winding, expressed in volts; Pn = rated voltage of the transformer (kVA);
= short circuit voltage of the transformer, %; Opir of the windings of the transformer Rtr can be calculated from the overhead costs in the following order:
in milli-ohms
de:
Pcu = severe sweating in the vata;
In = rated full load jet in amps;
Rtr = one-phase value of the transformer in mili-ohms (low-voltage and two-phase high-voltage windings for one phase of low voltage are included).

With approximate calculations, the value of Rtr can be changed, since X = Z in standard transformers. I Automatic vimikachi
In low-voltage lancets, it is necessary to protect the lower opir of the lancets' vimikachiv, as a rasterization of the short circuit point. The value of the reactive support is mentally taken equal to 0.15 mOhm on the automatic switch, then the same as the active support can be counteracted. I Choice of tires
The active support of the selected busbars sound small, and practically all the latest support is reactive and become approximately 0.15 mOhm / meter (2) of the length of the low-voltage busbars (the sub-base between the busbars reduces the reactive operation by approximately 10%).

Nominal tightness (kVA)	oil transformer	Dry transformer with livar resin insulation
Nominal tightness (kVA)

Rice. G37: Values of active support, reactive support for typical 400 V sub-transformers with 20 kV high-voltage windings

The value of the reactive support of the cables can be taken from the pickers. For cables with a span of less than 50 mm2, the reactive support can be adjusted. For other information, you can change the value of 0.08 mOhm / m (for a treadmill with a frequency of 50 Hz) or 0.096 mOhm / m (for a treadmill of 60 Hz). At times of ready-made bus ducts and similar cable ducts at the warehouse, go for money to the picker.
Dviguni
At the moment of a short zamikannya, a working dvigun diatime (for a short hour) like a generator, and give a strum at the mist of the day.
At a vipadku, tsim deakim zbіlshennyam struma KZ can be znehtuvat. However, for more accurate calculations, call out, in the case of great dvigunіv and / or a large number of small, big zbіlshennya struma can be estimated from the formula:
Iscm = 3.5 In for cutaneous motors, then 3.5m In for m similar motors, which can be done at the same time. Motors, which are accepted to the point of respect, are due only to 3-phase ones, the introduction of single-phase motors to increase the struma is useless.
Opіr arc at mist's mischief
Short chimes sound to establish an arc, as you may opir. The operation is not stable and the average value is low, but at low pressure, the operation is sufficient, so that the singing world will reduce the fluctuations. Practice shows that the drop in the strum is close to 20%. It effectively facilitates the work of an automatic vimikacha with the inclusion of a lancet, but with no infusion of the yogo strum included.

U20: Interphase voltage of the open circuit of the secondary winding of the step-down transformer (in volts).
psc: Exhaustion Z-x phase short circuit short circuit on high-voltage inputs of low-voltage transformers (KVA).
Pcu: High power consumption of 3-phase voltage for step-down transformers (for watts).
Pn: Rated voltage of step down transformer (kVA).
Usc: Short circuit voltage of the step down transformer (%).
RT: Hot Opir XT: Hot Jet Opir
p = nursery opir working dart at normal temperature
p = 22.5 mOhm x mm2/m for midi
p \u003d Z6 mOhm x mm2 / m for aluminum
If there are a sprat of darts per phase, connected in parallel, then divide the opir of one dart into a number of darts. The value of the reactive support may remain unchanged.
Rice. G3t: A table of the latest supports for the various parts of the living system has been added.
The table is shown (div. fig. G38)

■ Butt for short-circuit strumming (div. fig. G39)

Rice. G3S: Short circuit test case for a low voltage installation to operate at 400 V (nominal) voltage from a 1000 kVA step-down transformer
4.3 Strum Isc on the primal end line, fallow Isc on the end of the line
Merezha, shown in Fig. G40, showing a typical drop in the table in Fig. G41 on the forward side, folded by the composition method (descriptions in section F, section 6.2). Such tables allow you to accurately estimate the exact value of the short circuit at the point of measure, knowing:
The value of the struma of the short circuit at the point, roztashovanіy vishche merezhі vіd razglyana point;
Dovzhina that warehouse of the lancer between the point, in the same way the value of the strum of the short circuit, and the point, in the same way it is necessary to designate.

Rice. G4: Designation of the short circuit value (^) on the lower level, vicorist table Fig. G41
If it is sufficient to select an automatic switch, which is the most nominal value of the short circuit, closest (from the larger side) to the value indicated in the table. If you need more precise values, you can generate reports from surveys (div. pіdrozdіl 4.2) or use a software package, for example Ecodial. Moreover, in such a situation it is recommended to look at the possibility of using a cascade technology, for which installation
strumoobzhuvalny automatic vimikach on the upper line of the lancet allow us to use the automatic vimikach, install lower on the lancet, the nominal strum of the short circuit is lower, lower it would be necessary for other minds (div. Rozdil N, pdrozdil 4.5).
Description of the method
Choose a retinal dart in the column for medium darts(In this buttstock, the cross section is 47.5 mm2).
Choose from a row that shows an overcut of 47.5 mm2, a double dart, a straight lance, which is to be secured (or the closest to the new value from the smaller side). Descend vertically along the column, where the dozhina is shown and stagger on the row in the middle section (from three sections, seen on the table), so that it supports the visible struma of the short circuit (or the closest to it is the value from the larger side).
In this range, the value of 30 kA is the nearest value of 28 kA from the larger side. The value of the SC struma on the primal end of a 20-meter lancet is given on the vertical column, in which the dozhina is ruffled, and on the horizontal row, which shows the Isc struma at the point of the lancet lance (or the closest value on the larger side). In this butt, it is clear that the value is 14.7 kA.
Procedure to ask for aluminum wires similar, but here it will be necessary to rise in a vertical column, so that it will appear in the middle section of the table.
As a result, it is possible to vikoristovuvat automatic vimikach, mounting on DIN rails, nominal strum 63A and Isc = 25 kA (for example, vimikach NG 125N) for a lance with a strum 55A, shown in Fig. 40.
A Vimicach Compact with a rated 160 A strum and a strum Isc = 25 kA (e.g. Vimicach NS160) can be vicorated for a 160 A lance.
4 Short flicker strum

Note: for 3-phase system with 230V phase-to-phase voltage, divide the power supply into v3
Rice. G41: Isc streak at a point lower along the lance, which, according to the value of the short-circuit current, is higher behind the lance, with a cross section of the winding wires, at a 3-phase line with a nominal value of 230/400 V.
4.4 Strum
G - Zakhist Lanziugiv
or inverter: Div.